CN103473406A - Trousers shape structure parameter calculating device and method - Google Patents

Abstract

The invention discloses a device and method for calculating the structural parameters of trousers. Through the established mathematical models of the inclination angle of the back center line and the dynamic coefficient of the crotch buttocks, the inclination angle of the crotch and the dynamic coefficient of the crotch buttocks, the amount of back warping and the dynamic coefficient of the crotch buttocks, only It is necessary to determine the net hip circumference value and the dynamic coefficient of the crotch hip to obtain the structural parameter values such as the total crotch width, the inclination angle of the rear center line, the amount of back warping and the inclination angle of the inseam, and then carry out the next step of design and production. This method makes the determination of the parameters regular It can be followed, so that the values of the structural parameters of the trousers achieve the best compatibility, and the parameter calculation device makes the calculation of the parameters faster, saves a lot of manual calculation time, and is less prone to errors.

Description

A device and method for calculating structural parameters of trousers

technical field

The invention relates to the field of trousers production, in particular to a device and method for calculating structural parameters of trousers.

Background technique

Modern trousers are rich in shape and changeable in structure, consisting of skirt pants, wide crotch pants (the total crotch width is between fitted pants and skirt pants), fitted pants, narrow crotch pants (total crotch width is smaller than fitted pants), etc. The shape of the trousers series. Fitted trousers belong to the formal suit of trousers, which are relatively infrequently used and have a relatively fixed shape. However, wide crotch pants and narrow crotch pants are the mainstream styles of fashionable business wear and casual life wear. Structural parameters such as total crotch width, rear midline inclination, rear warp, and crotch inclination are the key technologies that affect the trousers sample. Personalize according to the shape of the trousers. In the field of clothing cutting technology in my country, the traditional proportional cutting method and the modern basic shape method are only suitable for the standard fit shape of men's and women's trousers model structure design of trousers. Since the system is relatively fixed, the value of its structural parameters has mature experience. It can be found that there are also patented cutting rulers of various shapes that can be used. When designing samples of wide crotch trousers and narrow crotch trousers, there is currently no quantitative relationship to be found for the values of the total crotch width, rear midline inclination, rear warp, and crotch inclination. The value of each parameter is determined by the experience of the trousers, resulting in the incompatibility of the values of the structural parameters of the trousers, which not only affects the dressing effect of the trousers, but also affects the comfort of the trousers.

Contents of the invention

In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a device and method for calculating parameters of trousers panel structure. The parameter calculation device makes the determination of parameters more convenient and quick. The calculation method is not only convenient for parameter calculation, but also can make the value compatibility of each structural parameter of the trousers.

In order to solve the above-mentioned problems, a device for calculating parameters of trousers panel structure disclosed by the present invention adopts the following technical solutions, which include:

The calculation processing module invokes the trousers panel shape mathematical model according to the set program, and calculates the structural parameter values such as total crotch width, rear midline inclination angle, back warp amount, and inseam inclination angle that are compatible with human body shape characteristics and shape requirements.

The keyboard module is used to select men's trousers mode and women's trousers mode, and input net hip circumference value and crotch-hip dynamic coefficient;

The display screen is used to display the input information of the keyboard and the output information of the calculation processing module;

The power supply module provides working power for the computing processing module and the display module.

Further, the trousers shape mathematical model includes a mathematical model of men's trousers mode and a mathematical model of women's trousers mode;

Described women's trousers mode mathematical model is:

The mathematical model of rear midline inclination α and crotch-hip dynamic coefficient K α=40-200K,

The mathematical model of the inclination angle β of the inseam and the dynamic coefficient K of the crotch buttocks β=190-950K,

The mathematical model of the amount of back warping h and the dynamic coefficient K of the crotch buttocks h=3H/16–25KH/24,

Among them, K ∈ (0.13, 0.20), H is the net hip circumference;

Described men's trousers mode mathematical model is:

The mathematical model of rear midline inclination α' and crotch-hip dynamic coefficient K' α'=187/4–425K'/2,

Mathematical model of crotch inclination β' and crotch-hip dynamic coefficient K' β'=385/2–875K',

The mathematical model of back warping h' and crotch-hip dynamic coefficient K' h'=5H'/23–(25K'H')/23,

Among them, K'∈(0.15, 0.22), H' is the net hip circumference.

The keyboard module includes a men's trousers mode button, a women's trousers mode button, a calculation mode button, a number input button, a cancel button and a confirmation button.

A method for calculating structural parameters of trousers panels disclosed by the present invention comprises the following steps:

(1) Based on the total crotch width, establish the mathematical models of the rear midline inclination angle and the dynamic coefficient of the crotch buttocks, the mathematical models of the inclination angle of the crotch and the dynamic coefficient of the crotch buttocks, and the mathematical models of the rear warp and the dynamic coefficient of the crotch buttocks;

(2) Select the mathematical model in men's trousers mode or women's trousers mode according to needs;

(3) According to the shape characteristics of the trousers, select the corresponding dynamic coefficient of the crotch and buttocks;

(4) Determine net hip circumference;

(5) Bring the net hip circumference and crotch-buttock dynamic coefficient into the mathematical model, and calculate the total crotch width, rear midline inclination, rear warp and inseam inclination that are compatible with the body shape characteristics and shape requirements Structure parameter values.

Further, the steps of establishing the mathematical model of the rear midline inclination angle α and the dynamic coefficient K of the crotch buttocks of the women's trousers mode are as follows:

a1, establish a coordinate system with the total crotch width x=KH as the abscissa, and the rear midline inclination α as the ordinate, wherein K is the dynamic coefficient of the crotch buttocks, and H is the net hip circumference value;

a2. According to the total crotch width x of the standard fit women's trousers structure, it is the thickness of the gluteal groove of the net hip circumference of the human body. If the dynamic coefficient of the crotch buttocks at this time is determined to be K=0.16, the total crotch width is x=K·H=0.16H, The rear midline inclination angle of this shape is α=8°, then the coordinate point of the standard fit trousers structure is P(0.16H, 8);

a3. According to the total crotch width of the standard fit women's culottes is the thickness of the net hips of the human body, it is determined that the dynamic coefficient of the crotch and hips at this time is K=0.2, and the total crotch width at this time is the maximum value of the women's crotch width, and the total crotch width x= K·H=0.2H, the inclination angle of the back centerline of this shape is α=0°, then the coordinate point of the standard fit skirt pants is Q(0.2H, 0);

a4. According to the determined P and Q points, the mathematical model of rear midline inclination α and crotch-buttock dynamic coefficient K is obtained α=40-200K;

a5. According to the characteristics of the buttocks of the standard female body in my country, the maximum value of the inclination angle of the rear midline of the narrow crotch pants is determined to be 14°, and the corresponding total crotch width at this time is the minimum value of the female crotch width;

a6. Use the graph method to obtain the intersection point T (0.13H, 14) of the straight line PQ and the straight line α=14°, and obtain the total crotch width x=0.13H, at this time K=0.13;

a7. According to the K value in steps a3 and a6, the value range of the crotch-hip dynamic coefficient K is obtained: K∈(0.13, 0.20).

Further, the steps of establishing the mathematical model of the inclination angle β of the rear inseam and the dynamic coefficient K of the crotch buttocks of the women's trousers mode are as follows:

b1, establish a coordinate system with the total crotch width x=KH as the abscissa, and the inclination angle β of the crotch as the ordinate, wherein K is the dynamic coefficient of the crotch buttocks, and H is the net hip circumference value;

b2. According to the total crotch width of the standard fit women's trousers structure is the thickness of the gluteal groove of the net hip circumference of the human body. If the dynamic coefficient of the crotch and hip at this time is determined to be K=0.16, then the total crotch width is x=K·H=0.16H, here The crotch inclination angle of the shape is β=38°, then the coordinate point of the standard fit trousers structure is E(0.16H, 38);

b3. According to the total crotch width of the standard fit women's culottes is the thickness of the net hip circumference of the human body, it is determined that the dynamic coefficient of the crotch and hip at this time is K=0.2, and the total crotch width at this time is the maximum value of the women's crotch width, and the total crotch width x= K·H=0.2H, the inclination angle of the inseam of this shape β=0°, then the coordinate point of the standard fit culottes is F(0.2H, 0);

b4, draw the mathematical model β=190-950K of the inclination angle β of the crotch and the dynamic coefficient K of the crotch buttocks according to the determined E and F two points;

b5. According to the characteristics of the buttocks of the standard female body in my country, when the maximum inclination angle of the rear midline of narrow crotch pants is 14°, the corresponding total crotch width is the minimum value of the female crotch width. At this time, the total crotch width K=0.13H;

b6. According to the K value in steps b3 and b5, the value range of the crotch-hip dynamic coefficient K is obtained: wherein K∈(0.13, 0.2).

Further, the steps of establishing the mathematical model of the rear warping amount h and the crotch buttock dynamic coefficient K of the women's trousers mode are as follows:

c1, establish the coordinate system with the total crotch width x=KH as the abscissa, and the amount of back warping h as the ordinate, wherein K is the dynamic coefficient of the crotch buttocks, and H is the net hip circumference value;

c2. According to the dynamic coefficient of the crotch and hip of the standard fit women's trousers structure K=0.16, that is, the total crotch width x=K·H=0.16H, corresponding to the back warp h=H/48 of this shape, then the standard fit women's trousers The coordinate point is M(0.16H, H/48);

c3. The crotch-hip dynamic coefficient K=0.2 of the standard fit skirt pants structure, that is, the total crotch width x=K·H=0.2H, corresponding to the back warping amount h=-H/48 of this shape, then the coordinate points of the fit skirt pants is N(0.2H, -H/48);

c4. According to the determined M and N points, the mathematical model h=3H/16–25KH/24 is obtained for the back warp amount h and the dynamic coefficient K of the crotch buttocks;

c5. According to the characteristics of the buttocks of the standard female body in my country, when the maximum inclination angle of the rear midline of the narrow crotch pants is 14°, the corresponding total crotch width is the minimum value of the female crotch width. At this time, the minimum value of the total crotch width is 0.13H;

c6. According to the K value in steps c3 and c5, the value range of the crotch-hip dynamic coefficient K is obtained: wherein K∈(0.13, 0.2).

Further, the steps to establish the mathematical model of the rear midline inclination angle α' and the crotch-buttock dynamic coefficient K' of the men's trousers model are as follows:

A1. Establish a coordinate system with the total crotch width x'=K'H' as the abscissa and the rear midline inclination α' as the ordinate, where K' is the dynamic coefficient of the crotch buttocks, and H' is the net hip circumference;

A2. According to the total crotch width x' of the standard fit men's trousers structure, it is the thickness of the gluteal groove of the net hip circumference of the human body. If the dynamic coefficient of the crotch and hip at this time is K'=0.18, the total crotch width is x'=K'·H '=0.18H', the inclination angle of the back center line of this shape is α'=8.5°, then the coordinate point of the standard fit men's trousers structure is P'(0.18H', 8.5);

A3. According to the total crotch width of the fit men's culottes is the thickness of the net hip circumference of the human body, it is determined that the dynamic coefficient of the crotch and hip at this time is K'=0.22. The total crotch width at this time is the maximum value of the male crotch width, and the total crotch width is x' =K'·H'=0.22H', the inclination angle of the rear midline of this shape is α'=0°, then the coordinate point of the fit men's culottes is Q'(0.22H', 0);

A4. Based on the determined P' and Q' points, the mathematical model of rear midline inclination α' and crotch-hip dynamic coefficient K' is obtained α'=187/4-425K'/2;

A5. According to the characteristics of the buttocks of the male body in our country, the maximum value of the inclination angle of the rear midline of the narrow crotch pants is determined to be 15°, and the corresponding total crotch width at this time is the minimum value of the male crotch width;

A6. Obtain the intersection point T'(0.15H, 15) of the straight line P'Q' and the straight line α'=15° by the graphic method, and obtain the total crotch width x'=0.15H', at this time K'=0.15;

A7. According to the K value in steps A3 and A6, the value range of the crotch-hip dynamic coefficient K' is obtained: K'∈(0.15, 0.22).

Further, the steps to establish the mathematical model of the inclination angle β' of the rear inseam and the dynamic coefficient K' of the crotch buttocks of the men's trousers model are as follows:

B1, establish a coordinate system with the total crotch width x'=K'H' as the abscissa, and the crotch inclination β' as the ordinate, wherein K' is the dynamic coefficient of the crotch buttocks, and H' is the net hip circumference value;

B2. According to the standard fit men’s trousers, the total crotch width is the thickness of the gluteal groove of the net hip circumference of the human body. If the dynamic coefficient of the crotch and hip at this time is K’=0.18, the total crotch width is x’=K’·H’= 0.18H', the crotch inclination angle of this shape β'=35°, then the coordinate point of the standard fit men's trousers structure is E'(0.18H', 35);

B3. According to the total crotch width of the standard-fit men’s culottes is the thickness of the net hip circumference of the human body, it is determined that the dynamic coefficient of the crotch and hip at this time is K’=0.22, and the total crotch width at this time is the maximum value of the male crotch width, and the total crotch width x '=K'·H'=0.22H', the inclination angle of the crotch of this shape β'=0°, then the coordinate point of the standard fit men's skirt pants is F'(0.22H', 0);

B4. According to the determined E' and F', the mathematical model of the crotch angle β' and the crotch-buttock dynamic coefficient K' is obtained β'=385/2-875K';

B5. According to the characteristics of the buttocks of the standard male body in my country, when the maximum inclination angle of the rear midline of narrow crotch pants is 15°, the corresponding total crotch width is the minimum value of the male crotch width. At this time, the total crotch width K'=0.15H';

B6. According to the value of K' in steps B3 and B5, the value range of the dynamic coefficient K' of the crotch and buttocks is obtained: where K'∈(0.15, 0.22).

Further, the steps to establish the mathematical model of the back warp h' and the dynamic coefficient K' of the crotch and buttocks of the men's trousers model are as follows:

C1, establish a coordinate system with the total crotch width x'=K'H' as the abscissa, and the back warp h' as the ordinate, wherein K' is the dynamic coefficient of the crotch buttocks, and H' is the net hip circumference value;

C2. According to the standard-fit men’s trousers structure, the crotch-hip dynamic coefficient K’=0.18, that is, the total crotch width x’=K’·H’=0.18H’, corresponding to the back warping amount h’=H’/46 of this shape , the coordinate point of the standard fit men's trousers is M'(0.18H', H'/46);

C3. The crotch-hip dynamic coefficient K'=0.22 of the standard-fit men's culottes structure, that is, the total crotch width x'=K'·H'=0.22H', corresponding to the back warping amount of this shape h'=-H'/46 , the coordinate point of the standard fit men's culottes is N'(0.22H', -H'/46);

C4. According to the determined M' and N' points, the mathematical model h'=5H'/23-25K'H'/23 is obtained for the back warp amount h' and the dynamic coefficient K' of the crotch buttock;

C5. According to the characteristics of the buttocks of the standard male body in my country, when the maximum inclination angle of the rear midline of narrow crotch pants is 15°, the corresponding total crotch width is the minimum value of the male crotch width. At this time, the minimum value of the total crotch width is 0.15H';

C6. According to the value of K' in steps C3 and C5, the value range of the crotch-hip dynamic coefficient K' is obtained: where K'∈(0.15, 0.22).

The beneficial effect of the present invention is: by setting up the mathematical model of rear midline inclination angle and dynamic coefficient of crotch buttocks, the mathematical model of inclination angle of crotch and dynamic coefficient of crotch buttocks and the mathematical model of back warping amount and dynamic coefficient of crotch buttocks, in determining the total crotch width , rear midline inclination, rear warp, and crotch inclination and other structural parameters, you only need to bring the net hip circumference and crotch-buttock dynamic coefficient into the mathematical model to calculate the total crotch that matches the body shape characteristics and shape requirements Structural parameter values such as width, back midline inclination, back warp, and crotch inclination make the determination of parameters in trousers production regular and followable, and prevent the incompatibility of various structural parameters of trousers due to the determination of parameter values based on experience . At the same time, the determination of the parameters is more accurate, convenient and fast through the parameter calculation device, which saves a lot of manufacturing process of trousers pattern design.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

Fig. 1 is a schematic diagram of a parameter calculation device of the present invention;

Fig. 2 is the calculation flowchart of the parameter calculation device of the present invention;

Fig. 3 is a schematic diagram of the total crotch width x, the rear midline inclination angle α, the crotch inclination angle β and the rear warp amount h of the fitted women's trousers of the present invention;

Fig. 4 is a schematic diagram of the total crotch width x, the rear midline inclination angle α, the crotch inclination angle β and the rear warping amount h of the fitted women's skirt pants of the present invention;

Fig. 5 is the regular diagram of the change law of the centerline inclination angle α of the women's trousers of the present invention along with the total crotch width x of the present invention;

Fig. 6 is the change law of the inclination angle of the crotch of the women's trousers with the total crotch width x of the present invention;

Fig. 7 is the change law of the amount of back warping of women's trousers according to the total crotch width x of the present invention;

Fig. 8 is a schematic diagram of the overall crotch width x', rear midline inclination angle α', crotch inclination angle β', and back warping amount h' of the fitted men's trousers of the present invention;

Fig. 9 is a schematic diagram of the total crotch width x', rear midline inclination angle α', crotch inclination angle β' and back warping amount h' of the fitted men's skirt trousers of the present invention;

Fig. 10 shows the change law of the inclination angle of the rear midline of men's trousers according to the total crotch width x' of the present invention;

Fig. 11 shows the change rule of crotch inclination angle with total crotch width x' of men's trousers of the present invention;

Fig. 12 shows the changing rule of the men's trousers warp according to the total crotch width x' of the present invention.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments.

As shown in Fig. 1, the specific embodiment of a kind of trousers plate structure parameter computing device of the present invention comprises:

The calculation processing module invokes the trousers panel shape mathematical model according to the set program, and calculates the structural parameter values such as total crotch width, rear midline inclination angle, back warp amount, and inseam inclination angle that are compatible with human body shape characteristics and shape requirements.

The keyboard module is used to select men's trousers mode and women's trousers mode, and input net hip circumference value and crotch-hip dynamic coefficient;

The display screen 4 is used to display the input information of the keyboard and the output information of the calculation processing module;

The power supply module provides working power for the computing processing module and the display module.

Further, the trousers shape mathematical model includes a mathematical model of men's trousers mode and a mathematical model of women's trousers mode;

Described women's trousers mode mathematical model is:

The mathematical model of rear midline inclination α and crotch-hip dynamic coefficient K α=40-200K,

The mathematical model of the inclination angle β of the inseam and the dynamic coefficient K of the crotch buttocks β=190-950K,

The mathematical model of the amount of back warping h and the dynamic coefficient K of the crotch buttocks h=3H/16–25KH/24,

Among them, K ∈ (0.13, 0.20), H is the net hip circumference;

Described men's trousers mode mathematical model is:

The mathematical model of rear midline inclination α' and crotch-hip dynamic coefficient K' α'=187/4–425K'/2;

Mathematical model of crotch inclination β' and crotch-hip dynamic coefficient K' β'=385/2–875K';

The mathematical model of back warping h' and crotch-hip dynamic coefficient K' h'=5H'/23–(25K'H')/23;

Among them, K'∈(0.15, 0.22), H' is the net hip circumference.

The keyboard module includes a men's trousers mode button 1 , a women's trousers mode button 2 , a calculation mode button 3 , a number input button 5 , a cancel button 6 and a confirmation button 7 .

As shown in Figure 2, the calculation process of this parameter calculation device is: the system enters different calculation modes according to the selected men’s trousers mode or women’s trousers mode. After inputting the crotch and hip coefficient K', the system judges the range of K', if K'∈(0.15, 0.22), it will further prompt to input the net hip circumference value H'; Crotch-hip coefficient K'. After inputting the net hip circumference value H', the system will bring the K' value and H' value into α'=187/4–425K'/2, β'=385/2–875K', h'=5H'/23– 25K'H'/23 is calculated, and the values of α', β' and h' are obtained and displayed on the display screen 4 .

When using the parameter calculation device, the user first presses the men's trousers mode button 1 or the women's trousers mode button 2, then according to the prompts, inputs the measured net hip circumference value and the selected crotch-buttocks coefficient into the calculation device, and presses the confirmation button 7 , The calculation result is displayed on the display screen 4. If the user makes a mistake, he can press the cancel button 6 to cancel the entered value. The user can make the next step of trousers pattern according to the value displayed by the device, which saves a lot of manual calculation time.

The embodiment of a kind of trousers panel structure parameter calculation method of the present invention is as follows:

Embodiment 1, women's trousers mode:

1. Establish the functional relationship between the inclination angle α of the rear midline of women's trousers and the dynamic coefficient K of the crotch buttocks

As shown in Figure 5, establish a coordinate system with the total crotch width x as the abscissa and the rear midline inclination α as the ordinate. From Fig. 3 and Fig. 4, it can be seen the schematic diagram of the total crotch width and the rear midline inclination angle of the standard fit women's trousers and the standard fit women's skirt pants. According to the construction principle of women's trousers based on clothing ergonomics, the total crotch width of the standard fit women's trousers structure is the thickness of the gluteal groove when the human body has a clean hip circumference. K·H=0.16H, corresponding to the rear midline inclination angle α=8° of this shape, reflected in the coordinate system in Figure 5, the coordinate point of the standard fit women's trousers structure is P(0.16H, 8); the standard fit women's skirt The total crotch width of the trousers structure is the thickness of the hip circumference of the human body, which is the maximum value of the crotch width of women's trousers. At this time, the dynamic coefficient of the crotch and hip is K=0.2, that is, the maximum value of the total crotch width x=K·H=0.2H, corresponding to this shape The rear midline inclination angle α=0° is reflected in the coordinate system in Figure 5, and the coordinate point of the standard fit skirt pants is Q(0.2H, 0). Connecting Q and P, the straight line QP corresponds to the compatibility area between the total crotch width x and the rear midline inclination angle α of wide-crotch women's trousers with a total crotch width between 0.16H-0.2H, such women's trousers K∈(0.16, 0.20 ). Extending QP to T, point T is the limit shape coordinate point of narrow crotch pants, its abscissa is the minimum value of the total crotch width, and the ordinate is the maximum value of the inclination angle of the rear midline. According to the characteristics of the buttocks of the standard female body in my country, when the inclination angle α of the rear midline of narrow crotch pants is > 14°, the shape of the pants will appear convex below the middle buttocks, tight above the buttocks, and the front and rear midlines of the trousers will be pressed against the human body. Large and other violations of the phenomenon of human body structure, so the maximum value of the rear midline inclination is 14°, and the minimum value of the total crotch width obtained by using the graph method is x=0.13H. At this time, K=0.13, then the coordinate of the T point is T(0.13 H, 14). Therefore, the straight line PT corresponds to the compatibility area between the total crotch width x and the rear midline inclination angle α of narrow crotch women's pants with a total crotch width between 0.13H-0.16H, such women's pants K∈(0.13, 0.16). Therefore, for all women's trousers shapes, the dynamic coefficient of crotch buttocks K ∈ (0.13, 0.20). From the two points of P and Q, α=40-200x/H can be obtained. Because the total crotch width x=KH, substituting the above formula to get the function relationship of the inclination angle α of the rear midline of women's pants with the dynamic coefficient K of the crotch buttocks is: α=40-200K, where K∈(0.13, 0.20).

2. Establish the functional relational expression of the inclination angle β of the crotch of women's trousers changing with the dynamic coefficient K of the crotch buttocks

As shown in Figure 6, establish a coordinate system with the total crotch width x as the abscissa and the crotch inclination β as the ordinate. The crotch-hip dynamic coefficient K=0.16 of the standard fit women’s trousers structure, that is, the total crotch width x=K·H=0.16H, corresponding to the crotch inclination angle β=38° of this shape, reflected in the coordinate system in Figure 6, the standard The coordinate point of the fit women's trousers structure is E(0.16H, 38); the crotch-buttock dynamic coefficient of the standard fit women's skirt pants structure is K=0.2, that is, the total crotch width x=K·H=0.2H, which corresponds to the inseam of this shape The inclination angle β=0° is reflected in the coordinate system of Fig. 6, then the coordinate point of the fitted culottes is F(0.2H, 0). Connecting F and E, the straight line FE corresponds to the compatibility area between the total crotch width x and the inclination angle β of wide-crotch women's trousers with a total crotch width between 0.16H-0.2H, such women's trousers K∈(0.16, 0.20 ). Extending FE to G, point G represents the extreme shape coordinate point of narrow crotch pants, its abscissa is the minimum value of the total crotch width, and the ordinate is the maximum inclination angle of the inseam, while the maximum inclination angle of the rear midline of narrow crotch pants is 14° The corresponding minimum value of the total crotch width is 0.13H, and K=0.13 at this time, and the coordinate of point G obtained by using the graphic method is G(0.13H, 66.5°). Then the straight line E corresponds to the compatibility area between the total crotch width x and the inclination angle β of narrow crotch women's trousers with a total crotch width between 0.13H-0.16H, such women's trousers K∈(0.13, 0.16). Therefore, in terms of the structure of women's trousers in all shapes, the dynamic coefficient of the crotch buttocks K ∈ (0.13, 0.20). According to the coordinate values of E and F, we get β=190-950x/H. Because the total crotch width x=KH, substituting into the above formula, the function relation of crotch inclination angle β of women's trousers changing with the dynamic coefficient K of crotch buttocks is: β=190-950K, where K∈(0.13, 0.20).

3. Establish the functional relational expression of the change of the back warp h of women's trousers with the dynamic coefficient K of the crotch buttocks

As shown in Figure 7, establish a coordinate system with the total crotch width x as the abscissa and the back warp h as the ordinate. The crotch-hip dynamic coefficient K=0.16 of the fit trousers structure, that is, the total crotch width x=K·H=0.16H, corresponding to the back warp h=H/48 of this shape, reflected in the coordinate system in Figure 7, Then the coordinate point of the standard fit women's trousers is M (0.16H, H/48); the crotch buttock dynamic coefficient K=0.2 of the standard fit women's skirt pants structure, that is, the total crotch width x=K·H=0.2H, corresponding to this shape The back warping amount h=-H/48 is reflected in the coordinate system of Fig. 7, and then the coordinate point of the fit skirt pants is N(0.2H,-H/48). Connect N and M, then the straight line NM corresponds to the compatibility area between the total crotch width x and the back warp h of wide crotch women's trousers with a total crotch width between 0.16H-0.2H, such women's trousers K∈(0.16, 0.20 ). Extending NM to U, point U represents the extreme shape coordinate point of narrow crotch pants, its abscissa is the minimum value of the total crotch width, and the ordinate is the maximum value of rear warp, while the maximum rear midline inclination angle of narrow crotch pants is 14° The corresponding minimum value of the total crotch width is 0.13H. At this time, KU=0.13, and the coordinate of U point obtained by graph method is U(0.13H, 5H/96). Then the straight line MU corresponds to the compatibility area between the total crotch width x and the back warp h of narrow crotch women's trousers with a total crotch width between 0.13H-0.16H, such women's trousers K∈(0.13, 0.16). Therefore, in terms of the structure of women's trousers in all shapes, the dynamic coefficient of the crotch buttocks K ∈ (0.13, 0.20). According to the coordinate values of M and N points, h=3H/16-25x/24 is obtained. Since the total crotch width x=KH, substituting into the above formula, the functional relationship between the back warp h of women's trousers and the dynamic coefficient K of the crotch buttocks is: h=3H/16–25KH/24, where K∈(0.13, 0.20).

4. Measure the net hip circumference H.

5. According to the shape characteristics of the trousers, select the corresponding dynamic coefficient K of the crotch and hip, K ∈ (0.13, 0.20).

6. Bring the crotch-buttock dynamic coefficient K into α=40-200K and β=190-950K to obtain the rear midline inclination α and lower gear inclination β, and bring the net hip circumference value H and the crotch-buttock dynamic coefficient K into h= In 3H/16–25KH/24, the h value of back warpage is obtained.

7. As shown in Figure 3 and Figure 4, draw the waist reference line a, hip circumference line b, and crossbar line c of the rear panel, and draw the total crotch width, rear center line, and rear warp respectively according to the structural parameter values obtained above quantity.

8. According to the conventional practice, draw dart lines and trouser leg contour lines and other structural lines and contour lines that can be individually designed to improve the trousers shape.

Embodiment 2, men's trousers mode:

1. Establish the functional relational expression of the inclination angle α' of the rear midline of men's trousers with the dynamic coefficient K' of the crotch buttocks

As shown in Figure 10, establish a coordinate system with the total crotch width as the independent variable x' and the rear midline inclination as the dependent variable α'. Figure 8 and Figure 9 are the basic structures of the total crotch width and rear midline inclination of standard fit men's trousers and standard fit men's culottes respectively. According to the structural composition principle of men's trousers based on clothing ergonomics, the total crotch width of standard fit men's trousers is the thickness of the gluteal groove of the net hip circumference of the human body. At this time, the dynamic coefficient of crotch and hip K'=0.18, that is, the total crotch width x'= K'·H'=0.18H', corresponding to the rear midline inclination angle α'=8.5° in this shape, reflected in the coordinate system in Figure 10, the coordinate point of the standard fit men's trousers is P'(0.18H', 8.5 ); the total crotch width of standard-fit men’s culottes is the thickness at the hip circumference of the human body, which is the maximum crotch width of men’s trousers. '=0.22H', corresponding to this shape, the rear midline inclination angle α'=0°, reflected in the coordinate system in Figure 10, the coordinate point of the standard fit men's culottes is Q'(0.22H', 0). Connecting Q' and P', the straight line Q'P' corresponds to the compatibility area between the total crotch width x' and the rear midline inclination angle α' of wide-crotch men's trousers with a total crotch width between 0.18H'-0.22H'. Class men's trousers K'∈(0.18, 0.22). Extend Q'P' to T', the T' point is the limit shape coordinate point of narrow crotch pants, its abscissa is the minimum value of the total crotch width, and the ordinate is the maximum value of the inclination angle of the rear midline. According to the characteristics of the buttocks of the standard male body in my country, when the inclination angle α' of the rear midline of men's trousers with narrow crotch is greater than 15°, the shape of the trousers will appear convex below the mid-middle buttocks, tight above the buttocks, and the front and rear midlines of the trousers are restrained by the horizontal crotch. Excessive pressure and other phenomena that violate the structure of the human body, so the maximum value of the rear midline inclination of men's trousers is 15°, and the minimum value of the total crotch width of narrow crotch pants when the rear midline inclination is 15° is obtained by the graph method is 0.15H. At this time K'=0.15, then the coordinate of point T' is T'(0.15H',15). Therefore, the straight line P'T' corresponds to the compatibility area between the total crotch width x' and the inclination angle α' of the narrow crotch men's trousers with a total crotch width between 0.15H'-0.18H', and this type of men's trousers K'∈( 0.15, 0.18). Therefore, as far as the structure of men's trousers is concerned, the dynamic coefficient of crotch buttocks K'∈(0.15, 0.22). Assuming that the inclination angle α' of the rear midline of men's trousers changes with the total crotch width x', the functional relationship is α'=a'x'+b', and substituting the coordinates of P' and Q', we get α'=187/4-425x '/2H'. Since the total crotch width x'=K'H', substituting into the above formula, the function relation of the inclination angle α' of the rear midline of men's trousers changing with the dynamic coefficient K' of the crotch hip is: α'=187/4–425K'/2, where K' ∈ (0.15, 0.22).

2. Establish the functional relationship between the inclination angle β' of the crotch of men's trousers and the dynamic coefficient K' of the crotch buttocks

As shown in Figure 11, establish a coordinate system with the total crotch width as the abscissa and the crotch inclination β' as the ordinate. The dynamic coefficient of crotch and buttocks of men’s standard fit pants K’=0.18, that is, the total crotch width x’=K’·H’=0.18H’, corresponding to the inclination angle of the crotch of this shape β’=35°, which is reflected in the coordinate system in Figure 11 , the coordinate point of the standard fit men’s trousers is E’(0.18H, 35); the dynamic coefficient of the crotch buttocks of the standard fit men’s skirt K’=0.18, that is, the total crotch width x’=K’·H’=0.22H’, The crotch inclination angle β'=0° corresponding to this shape is reflected in the coordinate system in Figure 11, then the coordinate point of the standard fit men's skirt pants is F'(0.22H', 0). Connecting F' and E', the straight line F'E' corresponds to the compatibility area between the total crotch width x' and the inclination angle β' of wide-crotch men's trousers with a total crotch width between 0.18H'-0.22H'. Men's trousers K'∈(0.16, 0.20). Extend F'E' to G', point G' represents the extreme shape coordinate point of narrow crotch pants, its abscissa is the minimum value of the total crotch width, the ordinate is the maximum value of the inclination angle of the crotch, and the inclination angle of the rear midline of the narrow crotch pants When the maximum value is 15°, the corresponding minimum value of the total crotch width is 0.15H', at this time K'=0.15, and the coordinate of point G' obtained by using the graphic method is G'(0.15H', 61.25). Then the straight line E'G' corresponds to the compatibility area between the total crotch width x' and the inclination angle β' of narrow crotch men's trousers with a total crotch width between 0.15H'-0.18H', such men's trousers K'∈( 0.15, 0.18). Therefore, as far as the structure of men's trousers is concerned, the dynamic coefficient of crotch buttocks K'∈(0.15, 0.22). From the coordinates of E' and F', we get β'=385/2-875x'/H'. Since the total crotch width x'=K'H', substituting into the above formula, the function relation of the crotch inclination angle β' of men's trousers changing with the dynamic coefficient K' of the crotch buttocks is: β'=385/2–875K', where K' ∈(0.15, 0.22).

3. Establish the functional relational expression of the change of men's trousers back warpage h' with the dynamic coefficient K' of the crotch buttocks

As shown in Figure 12, establish a coordinate system with the total crotch width as the independent variable x' and the back warp H' as the dependent variable. The dynamic coefficient of crotch and hip of standard fit male trousers is K'=0.18, that is, the total crotch width x'=K'·H'=0.18H', corresponding to the back warping amount of this shape h'=H'/46, which is reflected in the coordinates in Figure 12 In the system, the coordinate point of the standard fit men's trousers is M'(0.18H', H'/46); the dynamic coefficient of the crotch buttocks of the standard fit men's skirt K'=0.22, that is, the total crotch width x'=K'·H' =0.22H', corresponding to the back warping amount h'=-H'/46 of this shape, reflected in the coordinate system in Figure 12, the coordinate point of the standard fit men's skirt pants is N'(0.22H', -H '/46). Connecting N' and M', the straight line NM corresponds to the compatibility area between the total crotch width x' and the back warping amount H' of wide-crotch men's trousers with a total crotch width between 0.18H'-0.22H'. K' ∈ (0.18, 0.22). Extend N'M' to U', U' point represents the extreme shape coordinate point of narrow crotch pants, its abscissa is the minimum value of the total crotch width, the ordinate is the maximum value of the back warp, and the inclination angle of the back midline of narrow crotch pants When the maximum value is 15°, the corresponding minimum value of the total crotch width is 0.15H', at this time K'=0.15, and the coordinates of the U' point obtained by the graphic method are U'(0.15H', 5H'/92). Then the straight line N'U' corresponds to the compatibility area between the total crotch width x' and the back warp h' of narrow crotch men's trousers with a total crotch width between 0.15H'-0.18H', such men's trousers K'∈( 0.15, 0.18). Therefore, as far as the structure of men's trousers is concerned, the dynamic coefficient of crotch and hip is K'∈(0.15, 0.18). From the coordinates of M' and N', h'=5H'/23–25x'/23. Because the total crotch width x'=K'H', the functional relationship between the men's trousers' back warp h' and the dynamic coefficient K' of the crotch hip is substituted into the above formula: h'=5H'/23–25K'H'/ 23, where K' ∈ (0.15, 0.22).

4. Measure the net hip circumference H'.

5. According to the shape characteristics of trousers, select the corresponding crotch-buttock dynamic coefficient K', K'∈(0.15, 0.22).

6. Bring the crotch and buttock dynamic coefficient K' into α'=187/4-425K'/2 and β'=385/2-875K' to get the rear midline inclination α' and lower gear inclination β', and the net buttocks The circumference value H' and the dynamic coefficient K' of the crotch and hip are brought into h'=5H'/23-25K'H'/23 to obtain the value of the back warp h'.

7. As shown in Figure 8 and Figure 9, draw the waist reference line a, hip circumference line b, and crossbar line c of the rear panel, and draw the total crotch width, rear center line, and rear warp respectively according to the structural parameter values obtained above quantity.

8. According to the conventional practice, draw dart lines and trouser leg contour lines and other structural lines and contour lines that can be individually designed to improve the trousers shape.

The above is only a preferred embodiment of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered as the present invention. scope of protection.

Claims (10)

1. a fitted pants plate profile structure parameter calculation apparatus, is characterized in that, comprising:

The computing module, call fitted pants template mathematical model according to setting program, calculates the valuess of the structural parameters such as, postmedial line inclination angle wide with people's build characteristics and the compatible total crotch of modeling requirement, hind wing amount and in-leg inclination angle.

Keysheet module, for selecting male trousers pattern and slacks pattern, and input clean hip circumference value and crotch stern performance coeffcient;

Display screen, for the input message of display keyboard and the output information of computing module;

Power module, for computing module and display module provide working power.

2. a kind of fitted pants plate profile structure parameter calculation apparatus according to claim 1, is characterized in that, described fitted pants template mathematical model comprises male trousers pattern mathematical model and slacks pattern mathematical model;

Described slacks pattern mathematical model is:

The mathematical model α of postmedial line inclination alpha and crotch stern performance coeffcient K=40-200K,

The mathematical model β of in-leg angle of inclination beta and crotch stern performance coeffcient K=190-950K,

The mathematical model h=3H/16 – 25KH/24 of hind wing amount h and crotch stern performance coeffcient K,

Wherein, K ∈ (0.13,0.20), H is clean hip circumference value;

Described male trousers pattern mathematical model is:

The postmedial line inclination alpha ' with the mathematical model α ' of crotch stern performance coeffcient K '=187/4 – 425K '/2,

The in-leg angle of inclination beta ' with the mathematical model β ' of crotch stern performance coeffcient K '=385/2 – 875K ',

The mathematical model h ' of hind wing amount h ' and crotch stern performance coeffcient K '=5H '/23 – (25K ' H ')/23,

Wherein, K ' ∈ (0.15,0.22), H ' is clean hip circumference value.

3. a kind of fitted pants plate profile structure parameter calculation apparatus according to claim 1, is characterized in that, described Keysheet module comprises male trousers mode button, slacks mode button, computation schema button, digital load button, cancel button and ACK button.

4. a fitted pants plate profile structure calculation method of parameters, is characterized in that, comprises the following steps:

(1) take that total crotch is wide is basis, set up respectively the mathematical model of postmedial line inclination angle and crotch stern performance coeffcient, the mathematical model of in-leg inclination angle and crotch stern performance coeffcient, the mathematical model of hind wing amount and crotch stern performance coeffcient;

(2) select as required the mathematical model under male trousers pattern or slacks pattern;

(3), according to the fitted pants modeling characteristic, select corresponding crotch stern performance coeffcient;

(4) determine clean hip circumference value;

(5) clean hip circumference value and crotch stern performance coeffcient are brought in described mathematical model, calculate the valuess of the structural parameters such as, postmedial line inclination angle wide with people's build characteristics and the compatible total crotch of modeling requirement, hind wing amount and in-leg inclination angle.

5. a kind of fitted pants plate profile structure calculation method of parameters according to claim 4, is characterized in that, the step of setting up the mathematical model of the postmedial line inclination alpha of slacks pattern and crotch stern performance coeffcient K is:

A1, set up that to take the wide x=KH of total crotch be horizontal ordinate, the coordinate system that the postmedial line inclination alpha is ordinate, wherein, K is crotch stern performance coeffcient, H is clean hip circumference value;

A2, according to the wide x of total crotch of the fit panty configuration of standard, be the gluteal fold place thickness of the clean hip circumference of human body, determine crotch stern performance coeffcient K=0.16 now, total crotch is wide is x=KH=0.16H, the postmedial line inclination alpha of this moulding=8 °, the coordinate points of the fit panty configuration of standard is P (0.16H, 8);

A3, loose according to total crotch of the fit skirt trousers of standard be the clean hip circumference of human body place thickness, determine now crotch stern performance coeffcient K=0.2, total crotch now is wide is the wide maximal value of slacks crotch, total wide x=KH=0.2H of crotch, the postmedial line inclination alpha of this moulding=0 °, the coordinate points of the fit skirt trousers of standard is Q (0.2H, 0);

A4, according to determined P, 2 of Q, draw the mathematical model α of postmedial line inclination alpha and crotch stern performance coeffcient K=40-200K;

A5, according to the protruding characteristics of China standard female body stern, determine that the maximal value at narrow crotch trousers postmedial line inclination angle is 14 °, now corresponding total crotch is wide is the wide minimum value of slacks crotch;

A6, obtain the intersection point T(0.13H of straight line PQ and straight line α=14 ° by graphing method, 14), draw the wide x=0.13H of total crotch, now K=0.13;

A7, according to the K value in step a3 and a6, draw the span of crotch stern performance coeffcient K: K ∈ (0.13,0.20).

6. a kind of fitted pants plate profile structure calculation method of parameters according to claim 4, is characterized in that, the step of setting up the mathematical model of the rear in-leg angle of inclination beta of slacks pattern and crotch stern performance coeffcient K is:

B1, set up that to take the wide x=KH of total crotch be horizontal ordinate, the coordinate system that the in-leg angle of inclination beta is ordinate, wherein, K is crotch stern performance coeffcient, H is clean hip circumference value;

B2, wide according to total crotch of the fit panty configuration of standard be the gluteal fold place thickness of the clean hip circumference of human body, determine crotch stern performance coeffcient K=0.16 now, total crotch is wide is x=KH=0.16H, the in-leg angle of inclination beta of this moulding=38 °, the coordinate points of the fit panty configuration of standard is E (0.16H, 38);

B3, loose according to total crotch of the fit skirt trousers of standard be the clean hip circumference of human body place thickness, determine now crotch stern performance coeffcient K=0.2, total crotch now is wide is the wide maximal value of slacks crotch, total wide x=KH=0.2H of crotch, the in-leg angle of inclination beta of this moulding=0 °, the coordinate points of the fit skirt trousers of standard is F (0.2H, 0);

B4, according to determined E, 2 of F, draw the mathematical model β of in-leg angle of inclination beta and crotch stern performance coeffcient K=190-950K;

B5, according to the protruding characteristics of China standard female body stern, when the maximal value at narrow crotch trousers postmedial line inclination angle is 14 ° corresponding total crotch loose be the loose minimum value of slacks crotch, total wide K=0.13H of crotch now;

B6, according to the K value in step b3 and b5, draw the span of crotch stern performance coeffcient K: K ∈ (0.13,0.2) wherein.

7. a kind of fitted pants plate profile structure calculation method of parameters according to claim 4, is characterized in that, the step of setting up the mathematical model of the hind wing amount h of slacks pattern and crotch stern performance coeffcient K is:

C1, set up that to take the wide x=KH of total crotch be horizontal ordinate, the coordinate system that hind wing amount h is ordinate, wherein, K is crotch stern performance coeffcient, H is clean hip circumference value;

C2, according to the crotch stern performance coeffcient K=0.16 of the fit panty configuration of standard, i.e. total wide x=KH=0.16H of crotch, hind wing amount h=H/48 during corresponding this moulding, the coordinate points of the fit slacks of standard is M (0.16H, H/48);

The crotch stern performance coeffcient K=0.2 of the fit divided skirt structure of c3, standard, i.e. total wide x=KH=0.2H of crotch, the hind wing amount h=-H/48 of corresponding this moulding, the coordinate points of the fit skirt trousers of standard is N (0.2H ,-H/48);

C4, draw the mathematical model h=3H/16 – 25KH/24 of hind wing amount h and crotch stern performance coeffcient K according to determined M, 2 of N;

C5, according to the protruding characteristics of China standard female body stern, when the maximal value at narrow crotch trousers postmedial line inclination angle is 14 ° corresponding total crotch loose be the loose minimum value of slacks crotch, now total wide minimum value of crotch is 0.13H;

C6, according to the K value in step c3 and c5, draw the span of crotch stern performance coeffcient K: K ∈ (0.13,0.2) wherein.

8. a kind of fitted pants plate profile structure calculation method of parameters according to claim 4, is characterized in that, sets up the postmedial line inclination alpha of male trousers pattern ' with the step of the mathematical model of crotch stern performance coeffcient K ', be:

A1, set up that to take the wide x ' of total crotch=K ' H ' be horizontal ordinate, the postmedial line inclination alpha ' be the coordinate system of ordinate, wherein, K ' is crotch stern performance coeffcient, H ' is clean hip circumference value;

A2, according to the loose x ' of total crotch of the fit male trousers structure of standard, be the gluteal fold place thickness of the clean hip circumference of human body, determine crotch stern performance coeffcient K ' now=0.18, total crotch is wide is x '=K ' H '=0.18H ', the postmedial line inclination alpha of this moulding '=8.5 °, the coordinate points of the fit male trousers structure of standard is P ' (0.18H ', 8.5);

A3, loose according to total crotch of the male divided skirt of zoarium be the clean hip circumference of human body place thickness, determine now crotch stern performance coeffcient K '=0.22, total crotch now is wide is the wide maximal value of male crotch, total wide x ' of crotch=K ' H '=0.22H ', the postmedial line inclination alpha of this moulding '=0 °, the coordinate points of the fit male divided skirt of standard is Q ' (0.22H ', 0);

A4, according to determined P ', 2 of Q ', draw the postmedial line inclination alpha ' with the mathematical model α ' of crotch stern performance coeffcient K '=187/4-425K '/2;

A5, according to the protruding characteristics of China standard man's body stern, determine that the maximal value at narrow crotch trousers postmedial line inclination angle is 15 °, now corresponding total crotch is wide is the wide minimum value of male crotch;

A6, obtain the intersection point T ' (0.15H, 15) of straight line P ' Q ' and straight line α '=15 ° by graphing method, draw the wide x ' of total crotch=0.15H ', now K '=0.15;

A7, according to the K value in steps A 3 and A6, draw the span of crotch stern performance coeffcient K ': K ' ∈ (0.15,0.22).

9. a kind of fitted pants plate profile structure calculation method of parameters according to claim 4, is characterized in that, sets up the rear in-leg angle of inclination beta of male trousers pattern ' with the step of the mathematical model of crotch stern performance coeffcient K ', be:

B1, set up that to take the wide x ' of total crotch=K ' H ' be horizontal ordinate, the in-leg angle of inclination beta ' be the coordinate system of ordinate, wherein, K ' is crotch stern performance coeffcient, H ' is clean hip circumference value;

B2, loose according to total crotch of the fit male trousers structure of standard be the gluteal fold place thickness of the clean hip circumference of human body, determine crotch stern performance coeffcient K ' now=0.18, total crotch is wide is x '=K ' H '=0.18H ', the in-leg angle of inclination beta of this moulding '=35 °, the coordinate points of the fit male trousers structure of standard is E ' (0.18H ', 35);

B3, loose according to total crotch of the fit male divided skirt of standard be the clean hip circumference of human body place thickness, determine now crotch stern performance coeffcient K '=0.22, total crotch now is wide is the wide maximal value of male crotch, total wide x ' of crotch=K ' H '=0.22H ', the in-leg angle of inclination beta of this moulding '=0 °, the coordinate points of the fit male divided skirt of standard is F ' (0.22H ', 0);

B4, according to determined E ', 2 of F ', draw the in-leg angle of inclination beta ' with the mathematical model β ' of crotch stern performance coeffcient K '=385/2-875K ';

B5, according to the protruding characteristics of China standard man's body stern, when the maximal value at narrow crotch trousers postmedial line inclination angle is 15 ° corresponding total crotch loose be the loose minimum value of male crotch, total wide K ' of crotch=0.15H ' now;

B6, according to the K ' in step B3 and B5 value, draw the span of crotch stern performance coeffcient K ': K ' ∈ (0.15,0.22) wherein.

10. a kind of fitted pants plate profile structure calculation method of parameters according to claim 4, is characterized in that, the hind wing amount h ' that sets up male trousers pattern with the step of the mathematical model of crotch stern performance coeffcient K ' is:

C1, set up that to take the wide x ' of total crotch=K ' H ' be horizontal ordinate, the coordinate system that hind wing amount h ' is ordinate, wherein, K ' is crotch stern performance coeffcient, H ' is clean hip circumference value;

C2, according to the crotch stern performance coeffcient K ' of the fit male trousers structure of standard=0.18, i.e. total wide x ' of crotch=K ' H '=0.18H ', the hind wing amount h ' during corresponding this moulding=H '/46, the coordinate points of the fit male trousers of standard is M ' (0.18H ', H '/46);

The crotch stern performance coeffcient K ' of the fit male divided skirt structure of C3, standard=0.22, i.e. total wide x ' of crotch=K ' H '=0.22H ', the hind wing amount h ' of corresponding this moulding=-H '/46, the coordinate points of the fit male divided skirt of standard is N ' (0.22H ' ,-H '/46);

C4, according to determined M ', 2 of N ', draw the mathematical model h ' of hind wing amount h ' and crotch stern performance coeffcient K '=5H '/23 – 25K ' H '/23;

C5, according to the protruding characteristics of China standard man's body stern, when the maximal value at narrow crotch trousers postmedial line inclination angle is 15 ° corresponding total crotch loose be the loose minimum value of male crotch, now total wide minimum value of crotch is 0.15H ';

C6, according to the K ' in step C3 and C5 value, draw the span of crotch stern performance coeffcient K ': K ' ∈ (0.15,0.22) wherein.

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