JPH07310782A - Vibration control device - Google Patents

Abstract

(57) [Abstract] [Object] The present invention suppresses the vibration of a structure by vibrating the added mass by elastic deformation of the laminated rubber when the vibration of the structure is input, and at the same time determines the spring constant of the laminated rubber. An object of the present invention is to provide a vibration damping device having an adjustable structure. [Structure] The vibration damping device 11 generally includes an additional mass 13 having a size corresponding to the mass of a structure, a laminated rubber 14 that swingably supports the additional mass 13, and a partial movement of the laminated rubber 14. A regulating member 15 for regulating the spring constant of the laminated rubber 14 and a regulating range adjusting mechanism 16 for changing the position of the regulating member 15 in the vertical direction to regulate the regulating range for the laminated rubber 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device, and in particular, an added mass is swingably supported by a laminated rubber, and when the vibration of a structure is input, the added mass is oscillated by elastic deformation of the laminated rubber. The present invention relates to a vibration damping device configured to damp the vibration of a structure.

[0002]

2. Description of the Related Art For example, a structure such as a building is provided with a vibration damping device for damping vibrations caused by an earthquake or wind pressure. One of the vibration damping devices of this type is a passive vibration damping device configured to support an additional mass by laminated rubber.

As shown in FIG. 26, the vibration damping device 1 has a structure in which the additional mass 2 is supported by the laminated rubber 3. The laminated rubber 3 is formed by alternately laminating disc-shaped rubber plates 4 and metal plates 5. Since the rubber plate 4 has viscoelasticity, when the vibration is input from the outside, the rubber plate 4 of each layer is elastically deformed to swing the additional mass 2. Therefore,
In the laminated rubber 3, the weight of the additional mass 2 is set to a size according to the total weight of the structure, and the number of laminated rubbers according to the natural frequency of the structure is laminated to effectively vibrate the structure. Can be controlled by.

When the mass of the additional mass 2 is M, the mass of the metal plate 5 of each layer of the n-layer laminated rubber 3 is m _r, and the spring constant of the rubber plate 4 is modeled as K _{r1 to} K _rn , FIG. 27 is obtained. As shown in. Then, assuming that the mass m _r of the metal plate 5 of each layer is zero, the spring constant K _{r of the} whole laminated rubber 3 is 1 / K _r = 1 / K _r1 + 1 / K _r2 + ... + 1 / K _rn (1) ). Further, the natural frequency f of the additional mass 2 is obtained by the following equation.

F = 1 / 2π × √ (K / M) (2) Therefore, the natural frequency of the vibration damping device 1 is added so as to match the natural frequency of the structure in the A direction (horizontal direction). By setting the mass of the mass 2 and the spring constant K _r of the laminated rubber 3 as a whole, the primary vibration of the structure can be suppressed.

[0006]

However, in the case of a structure such as a building, the strength of the steel frame may be lower than at the time of construction, or the air conditioning equipment may be added.
After several years have passed since the construction, the natural frequency of the structure itself changes and the difference from the natural frequency of the vibration damping device 1 gradually increases.

Therefore, in the case of the vibration damping device using the laminated rubber as described above, the mass of the additional mass 2 is changed when the natural frequency of the structure is changed due to a new installation of the vibration damping device or aging. By changing it, the natural frequency of the vibration damping device was made to match the natural frequency of the structure. Therefore, it is necessary to manufacture a dedicated additional mass 2 for each structure, and it takes a lot of time and effort to match the natural frequency of the additional mass 2 with the natural frequency of the structure. Although the natural frequency is measured and the mass of the additional mass 2 is obtained by calculation, an error with the theoretical value may occur when actually installed, and it is difficult to accurately match the natural frequency.

When the volume of the additional mass 2 is limited, the additional mass 2 cannot be changed significantly, and when the natural frequency of the structure changes greatly, the natural frequency of the vibration damping device is changed. It becomes difficult to match the natural frequency with the natural frequency of the structure.

Therefore, an object of the present invention is to provide a vibration damping device that solves the above problems.

[0010]

The invention according to claim 1 is
In a vibration damping device configured to oscillate an additional mass by a laminated rubber formed by alternately laminating a plurality of metal plates and rubber plates, a part of the plurality of metal plates and rubber plates is provided. It is characterized by comprising a regulation member for regulating the movement, and a regulation range adjusting mechanism for regulating the regulation range by the regulation member.

According to a second aspect of the invention, the regulation range adjusting means includes a detection means for detecting the vibration of the structure, and a driving means for driving the regulation member in the laminating direction of the metal plate and the rubber plate. The control means drives and controls the drive means based on a detection signal from the detection means so that the regulation range of the regulation member becomes an appropriate value.

[0012]

According to the first aspect of the invention, the regulating member regulates the movement of a part of the laminated rubber formed by alternately laminating a plurality of metal plates and rubber plates, and the regulating range adjusting mechanism regulates the regulating range by the regulating member. By adjusting, it becomes possible to easily adjust the natural frequency of the additional mass to match the natural frequency of the structure after the device is installed in the structure. or,
It is not necessary to manufacture a dedicated additional mass for each structure, and productivity can be improved.

According to the second aspect, the drive means is drive-controlled based on the detection signal from the detection means, and the regulation range by the regulation member can be automatically adjusted to an appropriate value. The spring constant can be effectively damped by the spring constant according to the vibration of the object.

[0014]

1 and 2 show a first vibration damping device according to the present invention.
An example is shown.

In both figures, the vibration damping device 11 is a passive type device installed on the roof of a building 12 as a structure.

The vibration damping device 11 generally has an additional mass 13 having a size corresponding to the mass of the structure, a laminated rubber 14 for swingably supporting the additional mass 13, and a partial movement of the laminated rubber 14. A regulating member 15 for regulating the spring constant of the laminated rubber 14 and a regulating range adjusting mechanism 16 for changing the position of the regulating member 15 in the vertical direction to regulate the regulating range for the laminated rubber 14.

The additional mass 13 includes an iron weight 17 and an auxiliary weight 1.
It consists of eight. The weight 17 is provided with a storage portion 19 into which the regulating member 15 is vertically movable. When viewed from below, the storage portion 19 has an annular groove 19a formed in an annular shape as shown in FIG. 3, and a guide groove 19b extending in the X and Y directions inside the annular groove 19a and orthogonal to each other in a cross shape. 19c. Therefore, since the annular groove 19a and the guide grooves 19b and 19c are opened in the lower surface 13a of the additional mass 13, the annular groove 19a, the guide grooves 19b and 19 of the lower surface 13a are formed.
A fan-shaped contact portion 19d other than c is placed on the upper surface of the laminated rubber 14.

A central hole 21 is formed in the upper portion of the central portion 19e where the guide grooves 19b and 19c intersect with each other, through which the adjusting bolt 20 constituting the regulation range adjusting mechanism 16 is inserted. The adjusting bolt 20 is inserted into the central hole 21 from above the additional mass 13 via the washer 22, and the central portion 19e where the guide grooves 19b and 19c intersect each other.
It extends inside.

A plurality of annular auxiliary weights 18 are mounted on the upper surface 17a of the weight 17, and the weight 1 is attached by a plurality of bolts 23.
It is fixed integrally with 7. The hexagonal head 20a of the adjusting bolt 20 is inserted into the through hole 18a of the auxiliary weight 18, and a tool such as a hexagon box wrench is inserted from above the through hole 18a of the auxiliary weight 18 as described later. The adjusting bolt 20 can be rotated by using this.

Further, by loosening the bolts 23, the weight can be increased or decreased depending on the number of the auxiliary additional masses 18. Therefore, the auxiliary additional mass 1 provided on the upper surface 17a of the weight 17 is increased.
By changing the number of sheets of 8
The weight can be adjusted according to the size of 2.

As shown in FIG. 5, the laminated rubber 14 comprises a plurality of disc-shaped rubber plates 24 (24 _{1 to} 24 _n ).
And a plurality of metal plates 25 formed in a disk shape (25 21 _to
5 _n-1 ) are alternately laminated. The laminated rubber 14 is
For supporting the additional mass 13 having a considerable weight swingably, only the rubber plate 24 having a viscoelastic (24 ₁ to 24 _n) not fully supported, iron metal plate 25 is interposed between the rubber plate 24 This ensures the strength.

In the laminated rubber 14, the metal plate 25 has a larger diameter than the rubber plate 24, and a rubber coating 26 (see FIG. 5 in FIG. 5) on the outer periphery of the rubber plate 24 and the metal plate 25. The rubber plate 24 and the metal plate 25 are integrally bonded in a state of being in close contact with each other.
Therefore, the laminated rubber 14 can be elastically deformed as if it were one elastic body when the vibration in the A direction is input.

As shown in FIG. 6, the restricting member 15 comprises a cylindrical restricting portion 15a and stays 15b and 15c which are fixed to the upper end of the restricting portion 15a and which intersect each other in a cross shape.
The restriction portion 15a of the restriction member 15 has a larger diameter than the outer diameter of the laminated rubber 14, and as described later, a part of the laminated rubber 14 moves by fitting from above the laminated rubber 14 and covering the outer periphery thereof. That is, the spring constant of the laminated rubber 14 is changed by restricting the swinging motion during damping.

The restricting portion 15a of the restricting member 15 is vertically inserted into the annular groove 19a of the accommodating portion 19, and
The stays 15b and 15c are the guide grooves 19b of the storage portion 19,
It is fitted to 19c to form an anti-rotation mechanism. Accordingly, the stay 15b, 15c of the restriction member 15 is fitted in the guide grooves 19b, 19c of the housing portion 19 to guide the movement in the vertical direction, and the movement in the rotational direction is restricted.

Also, the intersection 15 between the stays 15b and 15c
A screw hole 15e is provided in d. This screw hole 1
Since the male screw 20b of the adjusting bolt 20 described above is screwed onto the 5e, when the adjusting bolt 20 is rotated by a tool, the regulating member 15 causes the annular groove 19 of the accommodating portion 19 to move.
Ascends and descends along the guide grooves 19b and 19c. As a result, the regulation range of the regulation member 15 that regulates the movement of the laminated rubber 14 is changed.

As described above, since the spring constant of the laminated rubber 14 can be adjusted, the vibration damping device 11 can be applied to structures having different natural frequencies, and is not manufactured for each structure. It is also possible to mass-produce in advance at the factory.

As shown in FIG. 7, when the installation work of the vibration damping device 11 having the above structure is completed, the spring constant of the laminated rubber 14 is adjusted.

That is, after the vibration damping device 11 is installed on the roof of the building 12, the building 12 is vibrated by vibrating the building 12 using a vibrator (not shown) for inputting a predetermined vibration to the building 12. Do the test. The additional mass 13 swings in the direction A along with the vibration of the building 12, and the laminated rubber 14
Elastically deforms and undergoes primary vibration.

The additional mass 13 gradually decreases in amplitude due to the damping operation of the laminated rubber 14, and eventually returns to the stop position. In this way, the vibration damping operation of the vibration damping device 11 suppresses the amplitude due to the vibration of the building 12.

The damping time Ta from when the building 12 stops the vibration to when the damping device 11 stops the damping operation is Ta.
To measure. This damping time Ta is a prescribed time Tb determined in advance (for example, when the roof of a building on the 30th floor is displaced by 1 cm by a damping device provided with an additional mass of 5% of the total mass of the building, this displacement of 1 cm Is within 20 to 30 seconds (about 1/3 or less of that without vibration) until the vibration is damped to 0 cm (Ta ≦ Tb), the natural frequency of the vibration damping device 11 is It is determined that it matches the natural frequency of the building 12. However, when the damping time Ta is longer than the specified time Tb (Ta> Tb), the natural frequency of the damping device 11 is the building 1
It is judged that they do not match the natural frequency of 2.

When the natural frequency of the vibration damping device 11 does not match the natural frequency of the building 12, as shown in FIG. 7, the adjusting bolt 20 is rotated by a tool to rotate the adjusting member 20.
The annular groove 19a, the guide groove 19b, 1 of the storage portion 19
Move down along 9c. As a result, the regulating portion 15a of the regulating member 15 is fitted on the upper portion of the laminated rubber 14 to change the spring constant of the laminated rubber 14.

The laminated rubber 14 has a plurality of rubber plates 24 (24
_{1 to} 24 _n ) and a plurality of metal plates 25 (25 ₁ to 2)
5 _n-1 ) are alternately laminated, so that, for example, the rubber plates 24 _{1 to} 24 ₅ and the metal plates 25 _{1 to} 25 ₅ provided on the upper portion of the laminated rubber 14 serve as the regulating portion 15 a of the regulating member 15. It shall be fitted.

In this case, it is considered that the rubber plates 24 _{1 to} 24 ₅ and the metal plates 25 _{1 to} 25 ₅ are removed from the laminated rubber 14, so that the laminated rubber 14 is separated from the rubber plates 24 _{6 to} 24 _n and the metal plate 25 _6. It has a natural frequency similar to that of a stack of ~ 25 _n-1 .

Therefore, in the vibration damping device 11 before adjustment, the overall spring constant K _r of the laminated rubber 14 is K _r = 1 / (1 / K _r1 + 1 / K _r2 + ... +1) according to the above-mentioned equation (1). / K _rn ) (3) However, after the adjustment, the spring constant K _r of the entire laminated rubber 14 becomes as shown in the following equation.

K _r = 1 / (1 / K _r6 + 1 / K _r7 + ... + 1 / K _rn ) (4) In this way, after the regulation range by the regulation member 15 is adjusted, the above-described vibration test is performed. The damping time Ta after the adjustment is measured. Then, the adjustment work is repeated until the vibration damping time Ta becomes substantially equal to the specified time Tb.

Therefore, in the present embodiment, the natural frequency of the vibration damping device 11 can be easily adjusted to match the natural frequency of the building 12 simply by rotating the adjusting bolt 20 with a tool. Therefore, the additional mass 13 of the vibration damping device 11
There is no need to make a special for each building. Therefore, the productivity of the vibration damping device 11 is improved, the manufacturing cost can be reduced due to the effect of mass production, and it is also possible to manufacture the device in advance, and it is possible to shorten the delivery time from the ordering to the installation. it can.

FIG. 8 shows a second embodiment of the present invention.

In the figure, the vibration damping device 31 has an additional mass 32.
A laminated rubber 33 and a regulating rod 34 as a regulating member.
And a regulation range adjusting mechanism 35 for moving the regulation rod 34
And consists of.

The regulating rod 34 is inserted in the central hole 32a of the additional mass 32 so as to be able to move up and down. Further, the tip end portion 34a of the regulation rod 34 is formed in a conical shape, and the through hole 33a (in FIG. 8, in FIG.
(Indicated by a broken line).

An adjusting bolt 36 extending downward from the upper surface side of the additional mass 32 is screwed into the regulating rod 34, and a groove 32 formed vertically in the inner wall of the central hole 32a.
It has pins 34b and 34c which engage with b and 32c.

Therefore, the restricting rod 34 has the grooves 32b, 3
Since the rotation is restricted by the pins 34b and 34c engaging with 2c, when the adjustment bolt 36 that constitutes the regulation range adjustment mechanism 35 is rotated, it moves up and down to insert the laminated rubber 33 into the through hole 33a. The length is adjusted.

In the laminated rubber 33, the swing of the rubber plate 33b and the metal plate 33c in the portion where the restriction rod 34 is fitted is restricted, and the spring constant is changed. In this way, the vibration damping device 31
Has a configuration in which the regulation rod 34 is inserted into the through hole 33a of the laminated rubber 33 and the natural frequency is changed according to the insertion length thereof. Therefore, it is simpler than the configuration of the first embodiment and can be easily performed. It can be manufactured, and the manufacturing cost can be further reduced.

FIG. 9 shows a third embodiment of the present invention.

In the figure, the vibration damping device 41 has an additional mass 42.
A laminated rubber 43, a first regulation member 44, a second regulation member 45, a first regulation range adjusting mechanism 46 for moving the first regulation member 44, and a second regulation member 45. And a second regulation range adjusting mechanism 47. The additional mass 42 is formed on the lower surface side of the first guide groove 4 extending in the X direction.
2a and a second guide groove 42b extending in the Y direction orthogonal to the first guide groove 42a.

The first restricting member 44 is composed of a laterally extending portion 44a extending in the X direction and a pair of arm portions 44b and 44c extending below both ends of the laterally extending portion 44a. The first restricting member 44 has a first guide groove 42a extending in the X direction.
The pair of arm portions 44b, 44 are fitted in the inside so as to be able to move up and down.
The tip portion of c is engaged so as to sandwich the outer periphery of the laminated rubber 43 from the X direction.

The second restricting member 45 includes a laterally extending portion 45a extending in the Y direction and a pair of arm portions 45b and 45c extending below both ends of the laterally extending portion 45a. Part 45
c is hidden and invisible). The first restricting member 45 is fitted in a second guide groove 42b extending in the Y direction so as to be able to move up and down, and the tip portions of the pair of arm portions 45b and 45c are arranged on the outer periphery of the laminated rubber 43 in the Y direction. Engage so as to sandwich it from the direction.

Recess 42 provided on the upper surface of additional mass 42
c includes a first guide groove 42a and a second guide groove 42b.
Through holes 42d and 42e are formed to penetrate through. The first adjustment bolt 48 constituting the first regulation range adjustment mechanism 46 is inserted from the recess 42c into the through hole 42d,
It is screwed onto the restriction member 44. In addition, the second adjustment bolt 49 that constitutes the second regulation range adjustment mechanism 47 has the recess 42c.
It is further inserted into the through hole 42e and screwed into the second restricting member 45.

Therefore, the first restricting member 44 can be moved up and down by rotating the first adjusting bolt 48, and the second restricting member 4 can be rotated by rotating the second adjusting bolt 49.
5 can be raised and lowered. In this way, the first restricting member 44 and the second restricting member 45 can be individually moved up and down, so that the restricting ranges in the X direction and the Y direction can be adjusted independently.

Therefore, the laminated rubber 43 can be set such that the spring constant in the X direction and the spring constant in the Y direction differ depending on the ascending / descending position of the first restricting member 44 and the second restricting member 45. Becomes Therefore, the vibration damping device 41 is suitable for damping a structure having different natural frequencies in the X direction and the Y direction.

10 to 13 show the fourth embodiment of the present invention.

In the figure, the vibration damping device 51 has an additional mass 52.
And four laminated rubbers 53 to 56 supporting the additional mass 52.
And a regulating member 5 for regulating a part of each of the laminated rubbers 53 to 56.
7 to 60 and regulation range adjusting mechanisms 61 to 64 for moving the regulation members 57 to 60.

For example, when damping a large structure, it is necessary to increase the additional mass 52 according to the mass of the structure. For example, when the additional mass 52 has a weight of about 4 times the additional mass 13, it is easier to use four laminated rubbers 53 to 56 of the same size as the laminated rubber 14 than to manufacture a large laminated rubber. It can be manufactured and the manufacturing cost can be kept low.

The restricting members 57-60 and the restricting range adjusting mechanisms 61-64 have the same structure as that of the first embodiment described above, and therefore detailed description thereof will be omitted. Therefore, the spring constant of each of the laminated rubbers 53 to 56 can be adjusted by the ascending / descending position of each of the regulating members 57 to 60.

When adjusting the ascending / descending positions of the regulating members 57-60, the four adjusting bolts 20 of the regulating range adjusting mechanisms 61-64 are rotated. An adjustment position display mechanism 67 including a scale 68 provided on the upper surface of the washer 22 is arranged around the head 20a of each adjustment bolt 20. Therefore, when the adjustment bolts 20 are rotated, the projections 69 protruding from the outer periphery of the head portion 20a of each adjustment bolt 20.
Read the scale 68 on which the four match and the four adjustment bolts 2
The amount of rotation of 0, that is, the raising and lowering positions of the restriction members 57 to 60 are set to be the same. With this, the spring constants of the laminated rubbers 53 to 56 are set to the same, and the four laminated rubbers 53 to 56 are set.
Can generate the same damping force.

FIG. 14 shows a model of the structure in which the additional mass 52 is supported by the four laminated rubbers 53 to 56 like the vibration damping device 51.

The spring constant K _rA of the laminated rubber 53 is given by the above formula (4) as follows: K _rA = 1 / (1 / K _r1 + 1 / K _r2 + ... + 1 / K _rn ) (5) , Other laminated rubbers _54-56 spring constant K _rB
~ K _rD can be similarly expressed.

After adjusting the lifting positions of the regulating members 57 to 60, the spring constants K _{rA to} K of the laminated rubbers 54 to 56 are adjusted.
_rD is given by the following equation.

K _rA = 1 / (1 / K _r6 + 1 / K _r7 + ... + 1 / K _rn ) ... (6) and the spring constants K _rB of the other laminated rubbers 54 to 56 are _obtained.
~ K _rD can be similarly expressed. Therefore, the spring constant K of the entire vibration damping device 51 is K = K _rA + K _rB + K _rC + K _rD (7)

FIG. 15 shows a modification of the adjustment position display mechanism.

An adjustment position display mechanism 70 is provided near the adjustment bolt 20. Shaft 20 of this adjusting bolt 20
A small diameter gear 71 is provided in c, and a large diameter gear 73 meshing with the small diameter gear 71 is provided on the upper surface of the additional mass 52.
It is rotatably supported by. A pointer 73b projects from the upper surface of the large-diameter gear 73, and a scale 74 is formed around it.

When the adjusting bolt 20 is rotated, the rotation of the small diameter gear 71 is transmitted to the large diameter gear 73. The rotation amount of the adjusting bolt 20 is reduced by the gear ratio of the small diameter gear 71 and the large diameter gear 73. Therefore, the adjustment position display mechanism 7
With 0, the rotation angle of the adjustment bolt 20 can be known by reading the scale 74 pointed by the pointer 73b even when the adjustment bolt 20 is rotated by one rotation (360 °) or more, and the springs of the laminated rubbers 53 to 56 can be understood. It can be easily adjusted so that the constants are the same.

Further, instead of providing the adjustment position display mechanism, scales extending in the vertical direction are provided on the outer circumferences of the regulation members 57 to 60, and the regulation members 57 are moved by the scales moved downward from the lower surface of the additional mass 52. Alternatively, the ascending / descending positions of ˜60 may be directly read.

The number of laminated rubbers is not limited to four,
Depending on the size of the additional mass 52, two or three laminated rubbers may be installed, or four or more laminated rubbers may be used to support the additional mass 52.

The restricting members 57-60 and the restricting range adjusting mechanisms 61-64 are not limited to those in the first embodiment described above,
The same configuration as the second or third embodiment may be used.

16 to 18 show a fifth embodiment of the present invention.

In the figure, the damping device 81 has an additional mass 82.
And four laminated rubbers 83 to 86 supporting the additional mass 82.
And a regulating member 8 for regulating a part of each of the laminated rubbers 83 to 86.
7 to 80 and regulation range adjusting mechanisms 91 to 94 for moving the regulation members 87 to 90.

Since the regulating members 87 to 80 have the same structure as the regulating members 57 to 60 of the first embodiment described above, detailed description thereof will be omitted.

The regulation range adjusting mechanisms 91 to 94 include an acceleration sensor (detection means) 95 for detecting vibration (acceleration) of the building 12 and screw holes 87a to 80 of the regulation members 87 to 80.
A male screw 96 screwed to a and a stepping motor (driving means) 97 to rotate the male screw 96 to drive the regulating members 87 to 90 in the laminating direction of the laminated rubbers 83 to 86.
100, and a control device 101 that drives and controls the stepping motors 97 to 100 based on a detection signal from the acceleration sensor 95 so that the regulation range by the regulation members 87 to 80 becomes an appropriate value.

Therefore, in the vibration damping device 81, the regulating members 87 to 90 are moved up and down by driving and controlling the stepping motors 97 to 100 in accordance with the vibration cycle obtained from the change in acceleration when the building 12 vibrates. Laminated rubber 8
The spring constant of 3 to 86 can be automatically adjusted.

The control device 101 uses the acceleration sensor 95 described above.
A / D that receives the analog acceleration signal (see Fig. 19) output from the
A converter 102, a computing device 103 for computing based on the acceleration signal converted into a digital signal by the A / D converter 102, and a storage device 105 in which a regulating member movement amount table 104 as shown in FIG. 20 is stored. And the arithmetic unit 10
A motor driver 10 for driving the stepping motors 97 to 100 in accordance with the movement amount command calculated by 3
6 to 109.

In the regulation member movement amount table 104, the movement amounts of the regulation members 87 to 90 corresponding to the spring constants (rigidities) of the laminated rubbers 83 to 86 are registered. Therefore, the arithmetic device 103 obtains the spring constant of the laminated rubbers 83 to 86 according to the cycle of vibration obtained from the change in the acceleration of the building 12, as described later, and calculates the movement amount of the regulating members 87 to 90 according to the value. It is obtained from the restriction member movement amount table 104.

Now, the processing executed by the arithmetic unit 103 will be described.

In FIG. 21, the arithmetic unit 103 executes step S
1 (hereinafter, “step” is omitted), the stepping motors 97 to 100 are driven to control members 87 to 9
Move 0 upwards. Then, as shown in FIG.
Storage part 19 in which the regulating members 87 to 90 are formed in the weight 17.
The stepping motors 97 to 100 are driven until reaching the origin position where they abut on the annular groove 19a and the guide grooves 19b and 19c.

In the next step S2, zero is substituted for the current position data D _old of the regulating members 87 to 90, and the data is stored in the storage device 105.

Then, in S3, the A / D converter 102
Building 1 by the detection signal from the acceleration sensor 95 via
2 was observed, and as shown in FIG. 19, the period of vibration T _s
Ask for.

Then, the process proceeds to S4, and the laminated rubbers 83 to 86 are used.
Find the spring constant of. That is, since the natural frequency of the vibration damping device 81 may be the same as the natural frequency of the building 12, the spring constants of the entire laminated rubbers 83 to 86 are based on the cycle T _s of the vibration of the building 12 obtained in S3. Kr is calculated from the following equation.

Kr = (2π / T _s ) ² × M (8) (where M is the mass of the additional mass 13) In the next S5, the restriction member movement amount table 104 stored in the storage device 105.
The moving amount from the origin position of each regulating member 87-90 corresponding to the spring constant Kr of the entire laminated rubbers 83-86 calculated in S4 is obtained with reference to the target position data D _new of each regulating member 87-90. Is stored in the storage device 105.

Then, in S6, the difference between the target position data D _new and the current position data D _{old of} each of the regulating members 87 to 90 stored in the storage device 105 is obtained, and each of the regulating members 87 to 90 is stored.
The amount of movement from the current position of 90 to the target position is calculated.

At the next step S7, the restriction members 87 to 90 are set to S.
A target rotation amount of each stepping motor 97-100 required to operate the movement amount obtained in 6 is calculated.

Then, in S8, the target rotation amounts of the stepping motors 97-100 obtained in S7 are output to the motor drivers 106-109. As a result, FIG.
As shown in FIG. 2, the male screw 96 screwed into each of the regulation members 87 to 90 is driven by the target rotation amount, and each of the regulation members 87 to 9 is driven.
0 descends from the origin position to the target position.

Then, in S9, the value of the target position data D _new stored in the storage device 105 is set to the current position data D _new.
Substitute for _old .

After that, the process returns to S3 again, and the processes of S3 to S9 are repeated. Therefore, when the natural frequency of the building 12 fluctuates, the stepping motor 9 changes according to the fluctuation amount.
Since 7 to 100 are driven to move the regulating members 87 to 90 up and down, it is possible to regulate the damping operation of a part of the laminated rubbers 83 to 86 covered by the regulating members 87 to 90. As a result, the spring constants of the laminated rubbers 83 to 86 change, the natural frequency of the additional mass 13 matches the natural frequency of the building 12, and the vibration of the building 12 can be damped more effectively.

As described above, the stepping motors 97 to 100 are drive-controlled based on the detection signal from the acceleration sensor 95, and the regulation range by the regulation members 87 to 90 can be automatically adjusted to an appropriate value. The vibration can be effectively suppressed by the spring constant according to the vibration of the building 12.

Therefore, the movement positions of the regulating members 87 to 90 can be automatically adjusted so that the natural frequency corresponding to the vibration of the building 12 can be obtained, and the natural frequency of the building 12 can be changed by the movement of people, temperature change, and the like. Even if the value changes in a complicated manner, the regulating members 87 to 90 can be moved so that an appropriate spring constant corresponding to the vibration can be obtained each time, and vibration in a wider range of cycles can be suppressed.

In the fifth embodiment, four laminated rubbers 83 are used.
Although the configuration in which the combination of Nos. To 86 is combined is given as an example, it is needless to say that the present invention is not limited to this and can be applied to the configuration in which one or two or more laminated rubbers are combined.

Further, instead of the regulation member movement amount table 104 shown in FIG. 20 described above, each regulation member 87 to 90 is based on the regulation member movement amount table 110 as shown in FIG.
The amount of movement for each may be calculated individually. In that case, for example, in the configuration in which the low-rigidity laminated rubber and the high-rigidity laminated rubber are combined, the damping action is performed only by the low-rigidity laminated rubber by covering all the high-rigidity laminated rubber with the restriction member. It can be switched. With this, the vibration damping device can also function as an extremely low rigidity, so that it is possible to cover a wider period in which vibration can be damped.

In the above embodiment, the stepping motor is provided as the driving means, but the present invention is not limited to this. For example, a servo motor and a rotation angle detector for detecting the rotation angle of the servo motor may be used.

Further, in the embodiment, the period of vibration of the building 12 is measured by using the acceleration sensor. However, as a detecting means other than this, for example, a speed sensor or a displacement sensor is used to measure the building 1
Calculate the cycle or frequency of vibration of 2 and laminate rubber 83-86
The spring constant Kr may be adjusted.

FIG. 24 shows a sixth embodiment of the present invention.

In the figure, the vibration damping device 131 has an additional mass of 13
2, a laminated rubber 133, a restricting rod 134 as a restricting member, and a restricting range adjusting mechanism 135 for moving the restricting rod 134.

The regulation range adjusting mechanism 135 includes the regulation rod 1
A stepping motor 136 for moving up and down 34 is provided, and the drive is controlled so that a spring constant corresponding to the acceleration of the building 12 can be obtained as in the case of the fifth embodiment.

The restriction rod 134 is inserted into the central hole 132a of the additional mass 132 so as to be vertically movable. Further, the tip end portion 134 a of the regulation rod 134 is formed in a conical shape, and the through hole 13 formed in the central portion of the laminated rubber 133.
3a (indicated by a broken line in FIG. 24).

A male screw 137 driven by a stepping motor 136 extending downward from the upper surface side of the additional mass 132 is screwed into the regulating rod 134, and the central hole 13 is formed.
Grooves 132b, 132 vertically formed on the inner wall of 2a
It has pins 134b and 134c that engage with c.

Therefore, the regulating rod 134 is provided with the groove 132.
Since the rotation is restricted by the pins 134b and 134c that engage with the b and 132c, the stepping motor 136
When the male screw 137 is rotationally driven, it moves up and down to adjust the insertion length of the laminated rubber 133 into the through hole 133a.

In the laminated rubber 133, the swinging of the rubber plate 133b and the metal plate 133c in the part where the restriction rod 134 is fitted is restricted, and the spring constant is changed. As described above, the vibration damping device 131 drives the stepping motor 136 to insert the regulation rod 13 into the through hole 133a of the laminated rubber 133.
4 is inserted and the natural frequency is changed according to the insertion length, so that the structure is simpler than the structure of the fifth embodiment, can be easily manufactured, and the manufacturing cost is much lower. Can be

FIG. 25 shows a seventh embodiment of the present invention.

In the figure, the vibration damping device 141 has an additional mass 14
2, the laminated rubber 143, the first regulation member 144, the second regulation member 145, the first regulation range adjustment mechanism 146 for moving the first regulation member 144, and the second regulation member 145. It is composed of a second regulation range adjusting mechanism 147 to be moved. The additional mass 142 includes a first guide groove 142a extending in the X direction and a first guide groove 142a on the lower surface side.
Second guide groove 142b extending in the Y direction orthogonal to
And.

The first restricting member 144 comprises a laterally extending portion 144a extending in the X direction, and a pair of arm portions 144b, 144c extending below both ends of the laterally extending portion 144a. The first restricting member 144 is fitted in a first guide groove 142a extending in the X direction so as to be able to move up and down, and the tip portions of the pair of arm portions 144b and 144c make the outer periphery of the laminated rubber 143 X. Engage so as to sandwich it from the direction.

The second restricting member 145 includes a laterally extending portion 145a extending in the Y direction and a pair of arm portions 145b and 145c extending below both ends of the laterally extending portion 145a (however, in FIG.
The middle part and the arm part 145c are hidden and invisible). The first restricting member 145 is fitted in the second guide groove 142b extending in the Y direction so as to be able to move up and down, and the tip portions of the pair of arm portions 145b, 145c make the outer periphery of the laminated rubber 43 Y. Engage so as to sandwich it from the direction.

The concave portion 1 provided on the upper surface of the additional mass 142
42c has through holes 142d and 142e penetrating the first guide groove 142a and the second guide groove 142b.

The stepping motor 148 constituting the first regulation range adjusting mechanism 146 is provided in the recess 42c,
The male screw 148a that is rotationally driven by the stepping motor 148 is inserted into the through hole 142d and screwed into the first restricting member 144.

Further, the stepping motor 149 constituting the second regulation range adjusting mechanism 147 is provided in the recess 142c, and the male screw 149a rotatably driven by the stepping motor 149 is inserted into the through hole 142e so that the second screw is formed. The regulating member 145 is screwed.

Therefore, the stepping motor 148 can raise and lower the first restricting member 144 by rotationally driving the male screw 148a. Further, the stepping motor 149 can raise and lower the second restricting member 45 by rotationally driving the male screw 149a.

In this way, the stepping motor 148,
Since the drive control of 149 can be carried out individually, the 1st control member 144 and the 2nd control member 145 can be raised / lowered individually, and the control range of an X direction and a Y direction is adjusted independently, respectively. be able to.

Therefore, the laminated rubber 143 has an X value corresponding to the ascending / descending position of the first restricting member 144 and the second restricting member 145.
The spring constant in the direction and the spring constant in the Y direction can be set to be different. Therefore, the vibration damping device 141 is
It is suitable for damping a structure having different natural frequencies in the X and Y directions.

[0106]

As described above, according to the first aspect of the invention, the restricting member restricts the movement of a part of the plurality of metal plates and the rubber plate, and the restricting range adjusting mechanism adjusts the restricting range of the restricting member. Therefore, the position of the regulating member can be changed to adjust the spring constant of the laminated rubber to a desired value, which allows the spring constant of the laminated rubber to be varied after the device is installed in the structure to change the natural vibration of the added mass. The number can be easily adjusted to match the natural frequency of the structure. Moreover, 1
Since the range of natural frequencies that can be damped by one laminated rubber is expanded, it can be applied to a plurality of structures having different structures. Also, because it is not necessary to manufacture a dedicated additional mass for each structure, it becomes possible to mass-produce in advance in the factory,
The productivity can be improved and the manufacturing cost can be reduced.

According to the second aspect, the drive means is drive-controlled on the basis of the detection signal from the detection means, and the regulation range by the regulation member can be automatically adjusted to an appropriate value. The spring constant can be effectively damped by the spring constant according to the vibration of the object. Therefore, the movement position of the regulating member can be automatically adjusted so that the natural frequency corresponding to the vibration of the structure can be obtained, and even if the natural frequency of the structure changes in a complicated manner, it is possible to appropriately adjust the position according to the vibration. The restricting member can be moved so that the spring constant can be obtained, and the vibration can be damped more appropriately.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a vibration damping device according to the present invention.

FIG. 2 is a vertical cross-sectional view of a vibration damping device.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a vertical sectional view taken along the line IV-IV in FIG.

FIG. 5 is an enlarged perspective view showing a laminated rubber.

FIG. 6 is a perspective view of a regulation member.

FIG. 7 is a vertical cross-sectional view for explaining a method for adjusting the lifting position of the regulating member.

FIG. 8 is a perspective view of a second embodiment of the present invention.

FIG. 9 is a perspective view of a third embodiment of the present invention.

FIG. 10 is a perspective view of a fourth embodiment of the present invention.

11 is a perspective view of the vibration damping device shown in FIG. 10 as seen from below.

FIG. 12 is a vertical sectional view showing a restricting member and a restricting range adjusting mechanism of a fourth embodiment.

FIG. 13 is an enlarged perspective view showing an adjustment position display mechanism.

FIG. 14 is a diagram modeling a vibration damping device of a fourth embodiment.

FIG. 15 is an enlarged perspective view showing a modified example of the adjustment position display mechanism.

FIG. 16 is a perspective view of a vibration damping device of a fifth embodiment.

FIG. 17 is a longitudinal sectional view showing an enlarged main part of the fifth embodiment.

FIG. 18 is a block diagram showing a configuration of a control device.

FIG. 19 is an output waveform diagram of the acceleration sensor.

FIG. 20 is a conceptual diagram of a regulation member movement amount table stored in a storage device.

FIG. 21 is a flowchart for explaining a process executed by the arithmetic device.

FIG. 22 is a vertical cross-sectional view for explaining the operation of adjusting the regulation range by the stepping motor.

FIG. 23 is a conceptual diagram of a modified example of the restriction member movement amount table stored in the storage device.

FIG. 24 is an enlarged vertical sectional view showing a main part of the sixth embodiment.

FIG. 25 is a vertical cross-sectional view showing an enlarged main part of the seventh embodiment.

FIG. 26 is a perspective view for explaining a conventional vibration damping device.

FIG. 27 is a diagram modeling a conventional vibration damping device.

[Explanation of symbols]

11, 31, 41, 51 Vibration control device 12 Building 13, 32, 42, 52 Additional mass 14, 33, 43, 53-56 Laminated rubber 15 Restriction member 16, 35, 46, 47, 61-64 Restriction range adjustment mechanism 17 Weight 18 Auxiliary Weight 19 Storage Section 20 Adjustment Bolt 24 Rubber Plate 25 Metal Plate 67,70 Adjusted Position Display Mechanism 68,74 Scale 81 Vibration Control Device 82 Additional Mass 83-86 Laminated Rubber 87-80 Restriction Member 91-94 Restriction Range Adjustment mechanism 95 Acceleration sensor 96 Male thread 97 to 100 Stepping motor 101 Control device 102 A / D converter 103 Arithmetic device 104 Regulation member movement amount table 105 Storage device 106 to 109 Motor driver

Claims (2)

[Claims] 1. A vibration damping device, which is installed in a structure to be damped and has a structure in which an additional mass is swingably supported by a laminated rubber formed by alternately laminating a plurality of metal plates and rubber plates. A vibration damping device comprising: a restricting member that restricts movement of a part of the plurality of metal plates and the rubber plate; and a restricting range adjusting unit that adjusts a restricting range by the restricting member. . 2. The regulating range adjusting means includes a detecting means for detecting vibration of the structure, a driving means for driving the regulating member in a laminating direction of the metal plate and the rubber plate, and regulating by the regulating member. The vibration damping device according to claim 1, further comprising: a control unit that drives and controls the drive unit based on a detection signal from the detection unit so that the range becomes an appropriate value.