JPH0894476A - Decision system of means for correcting unbalance optimally - Google Patents

Abstract

PURPOSE: To facilitate the work for correcting the unbalance detected through rotation of a test piece by providing a memory for storing a data representative of the mutual relationship between a plurality of unbalance correcting directions and predetermined unbalance correction amounts. CONSTITUTION: A pulse sensor 1 takes out a pulse once for every revolution of a test piece and a synchronization signal generator 3 generates a synchronization signal for a tracking filter 2 based on the pulse signal. An oscillation detector 4 for detecting oscillation of the test piece is connected with the filter 2 through a variable gain amplifier 5. A memory 9 stores a data representative of the mutual relationship between a plurality of unbalance correcting directions being set for the test piece in order to correct unbalance thereof while keeping a predetermined angular relationship and the predetermined unbalance amount in the correcting direction. The unbalance amount operated by a CPU 8 is presented on a display 10 and the component in each direction of the unbalance amount and a required angle thereof can also be presented on a display 11 in response to an input on a keyboard 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for determining an optimum correction means for an unbalance amount detected by rotating a test body such as a rotary component of a flywheel or a torque converter.

[0002]

Conventionally, when detecting an imbalance amount by rotating a test body, such as a flywheel, as shown in FIG. 5, the detected unbalance quantity U ₀ for a predetermined plurality of imbalance correction direction ( In the example shown, 8 with an angle of 45 °
Desired correction direction (in the illustrated example, predetermined unbalance correction amounts UC1 and UC2)
Select one of the correction directions)
The residual unbalance amount UR ₀ when 1 and UC2 are applied is obtained.

Then, the residual unbalance amount UR ₀ is further decomposed in a predetermined correction direction, and its component force UA,
Each UB had a correction amount smaller than the predetermined imbalance correction amount.

[0004]

By the way, in the conventional unbalance correction means as described above, the residual unbalance amount U
In the correction direction in which the correction amount corresponding to R ₀ has a predetermined angular interval, two odd correction amounts smaller than the predetermined unbalance correction amount must always be applied in the two correction directions. In addition to the increase in the number of unbalanced corrections as a whole including the number of, there is a problem that it takes time to apply the above-mentioned odd amount of correction.

The present invention is intended to solve such a problem, and when the unbalance amount detected by rotating the test body is corrected, a plurality of unbalance correction directions having predetermined angular intervals are provided. In order to provide a disequilibrium optimum correction means determining device that simplifies the correction work by making only one odd correction amount in addition to the predetermined disproportion correction amount. To do.

[0006]

In order to achieve the above-mentioned object, the unbalance optimum correction means determining device of the present invention comprises an unbalance amount detecting means for rotating a test body to detect the unbalance amount of the test body. And a plurality of unbalance correction directions having a predetermined angular interval set on the test body to correct the unbalance amount detected by the unbalance amount detecting means, and in each of the correction directions. A memory for storing data of a correlation with a predetermined unbalance correction amount, and a correction component force in the correction direction of the predetermined angular interval for correcting the detected unbalance amount by referring to the data in the memory. Of the minimum number of correction force components, and second calculation means for obtaining a midway correction component force of the minimum number of correction component forces that is less than the predetermined unbalance correction amount. A third computing means for obtaining a relative angle of the system with respect to a vector of the unbalance amount with respect to a vector of the unbalance amount in the system of the minimum number of modified component forces including the midway corrected component force in order to cancel the unbalance amount. It is characterized by being configured.

When the angular interval is α and the predetermined unbalance correction amount is U, 1, 2, and i
Unbalance amounts N ₁ and N _{2 that} can be respectively corrected by U
And N _i are set by the following equation [Equation 6], and the table is stored in the memory.

N ₁ = UN ₂ = 2U cos (α / 2) i ≧ 3 N _i = N _i-2 + 2U cos {α (i-1) / 2}

Further, the unbalance amount detected by the unbalance amount detecting means is U ₀ , the angular interval is α, the minimum number is j, and (j-1) is the predetermined unbalance amount. When the unbalance correction amount is U ₁ ,
The midway correction component force U ₂ is obtained by the second calculating means by the following equations [Equation 7] and [Equation 8].

[0009]

(7) φ = 180 ° −jα / 2

[Equation 8]

Further, when the angle formed by the vector of U ₀ and the reference line is θ ₀ and the sandwiching angle of each vector of U ₀ and U ₁ is θ, the system of the minimum number of corrected component forces is set. The angle θ ₁ formed between the reference line and the reference line can be calculated by the third computing means by the following equations [Equation 9] and [Equation 10].

[Equation 9] U ₂ ² = U ₀ ² + U ₁ ² -2U ₀ U ₁ cos θ

[Formula 10] θ ₁ = θ ₀ − {(j−1) α / 2 + θ}

[0011]

In the above-described apparatus for determining the optimum unbalance correction means of the present invention, the unbalance amount detecting means rotates the test body to obtain the unbalance amount of the test body, and then the first unbalance amount is calculated. The minimum number of each component force of the predetermined unbalance correction amount and the halfway correction amount less than the same correction amount in the predetermined correction direction is calculated by the calculation means, and then the halfway correction amount is calculated by the second calculation means.

Further, by the third calculating means, in the system of the minimum number of correction component forces including the midway correction component force of the above-mentioned midway correction amount,
In order to cancel the unbalanced amount, the relative angle of the system with respect to the vector of the unbalanced amount is calculated with respect to the reference line, and in this way, the uncorrected correction amount other than the predetermined unbalanced correction amount is applied. The unbalanced optimum correction means that can be completed with one piece is determined.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of an unbalanced optimum correction means determining device as an embodiment of the present invention with reference to the drawings. FIG. 1 is a block diagram showing its schematic configuration, and FIG. 2 is a flow chart showing the flow of its arithmetic processing. 3 is an explanatory view schematically showing a mutual relationship between a plurality of unbalance correction directions having a predetermined angular interval stored in the memory and a predetermined unbalance correction amount in each of the correction directions, and FIG. It is explanatory drawing which shows typically the imbalance correction with respect to a test body.

In the apparatus for determining the optimum unbalance correction means of this embodiment, the unbalance amount U ₀ is obtained by rotating the test body such as the flywheel as in the conventional case.
That is, as shown in FIG. 1, a rotation pulse sensor 1 for extracting a pulse signal once per rotation of the test body, and a synchronization signal (SIN for the tracking filter 2 based on the pulse signal from the rotation pulse sensor 1 , COS
A sync signal generator 3 for producing a signal), and a vibration detector (pickup) 4 for detecting the vibration of the test body. The vibration detector 4 includes a variable gain amplifier 5
The tracking filter 2 is connected via.

The tracking filter 2 is a filter whose center frequency moves according to the number of revolutions,
This is a multiplication type filter, and the variable gain amplifier 5 is a device that varies the amplification factor according to the size of the signal input. The output signal from the tracking filter 2 is converted into digital data by the AD converter 6 and input to the interface 7. The unbalanced vibration measured on the rotating test body in this way is input to the interface 7. The measured value A (A
X, AY) is guided to the CPU 8 and the unbalance amount U ₀ is calculated by the influence coefficient method based on the measured value.

By the way, in order to correct the above-mentioned unbalance amount U _{0 in} this apparatus, as shown in FIG. 3, a predetermined angular interval α (45 in this embodiment) set on the test body is used.
Of a plurality of unbalance correction directions (8 in this embodiment).
Direction) and the predetermined unbalance correction amount U (the length of the vector corresponding to the radius of the small circle in FIG. 3) in each of the correction directions are stored in the memory 9 shown in FIG. . That is, when the predetermined unbalance correction amount is U, the angular interval is α, and when the predetermined unbalance correction amount is U, the unbalance amount N ₁ , which can be respectively corrected by 1, 2, and i U, The table of N ₂ and N _i is set by the following equation [Equation 11], and the table is stored in the memory 9.

[0017]

N ₁ = UN ₂ = 2U cos (α / 2) i ≧ 3 N _i = N _i-2 + 2U cos {α (i-1) / 2}

Then, the CPU 8 refers to the table stored in the memory 9, and determines the minimum number of correction component forces (two in the example shown in FIG. 3) in the predetermined correction direction for correcting the unbalance amount U ₀ . Of the predetermined unbalance correction component U and one midway correction component U ₂ ) (3 in total).

The CPU 8 is also provided with a second arithmetic means for obtaining the above-mentioned midway correction component force U ₂ . That is, the unbalance amount U ₀ detected by the unbalance amount detecting means is set, the angular interval in the correction direction is α, the minimum number is j, and the unbalance correction by the predetermined unbalance amount of (j−1) When the quantity is U ₁ , the midway correction component force U ₂ is calculated by the second calculation means by the following equations [Equation 12],
3] is required. In addition, [Number 12]
Φ in the equation is the angle shown in FIG.

[0020]

[Equation 12] φ = 180 ° -jα / 2

[Equation 13]

Furthermore, the CPU 8, as shown in FIG. 4, the vector of the middle modified component of force U ₂ the unbalance amount U ₀ to offset the unbalance amount U ₀ Fixed component force of the system the minimum number including There is provided a third calculating means for obtaining the relative angle θ ₁ of the above system with respect to the reference line 13.

That is, the angle between the vector of the unbalance amount U ₀ and the reference line 13 is θ ₀ , and the above U ₀ and U _{1 are set.}
Where θ is the sandwiching angle of each vector, the angle θ ₁ formed by the minimum number of corrected component force systems and the reference line 13 is calculated by the third computing means by the following equations [Equation 14], [Equation 15] ]] Is required.

[Equation 14] U ₂ ² = U ₀ ² + U ₁ ² -2U ₀ U ₁ cos θ

[Equation 15] θ ₁ = θ ₀ − {(j−1) α / 2 + θ}

In this embodiment, a predetermined unbalance correction amount (a predetermined weight is added at a predetermined radial position or a predetermined hole is drilled by a drill in each of the eight correction directions shown in FIGS. 3 and 4). In addition to the removal weight), in addition to the midpoint correction amount, the required weight is added or a hole is drilled to the required depth with a drill.

In the conventional method, as shown in FIG. 5, a total of four predetermined unbalance correction amounts UC1 and UC2 and two midway correction amounts UA and UB for correcting the unbalance amount U _0. However, in the apparatus of the present embodiment, two predetermined unbalance correction amounts UC1 and UC2 and one midway correction amount are required to correct the unbalance amount U ₀ as shown in FIG. The optimum correction means is determined so that a total of three corrections with UC3 will suffice.

The operation of the present apparatus as described above is performed as shown in the flow chart of FIG. The calculated unbalance amount U ₀ is displayed on the LCD display 10 as shown in FIG. 1, and the unbalance correction means determined as described above is displayed on the LED display 11. ing. Then, in response to a key input on the keyboard 12, the component force in each direction of the unbalance amount and the required angle can be called and displayed on the LED display 11.

[0026]

As described in detail above, according to the unbalanced optimum correction means determining device of the present invention, the following effects can be obtained. (1) The optimum correction means will be automatically determined when the imbalance of the test piece is corrected. (2) In the conventional correction method, in addition to relying on manpower, two corrections of a halfway correction amount less than a predetermined disproportionate correction amount were required. However, the apparatus of the present invention avoids such a problem, The amount of correction can be corrected by one, and the optimum correction is always applied.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an unbalanced optimum correction means determination device as an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of arithmetic processing in the apparatus of FIG.

FIG. 3 is an explanatory view schematically showing a mutual relationship between a plurality of unbalance correction directions having predetermined angular intervals stored in the memory of the apparatus of FIG. 1 and a predetermined unbalance correction amount in each of the correction directions. It is a figure.

FIG. 4 is an explanatory view schematically showing an imbalance correcting means for a test body.

FIG. 5 is an explanatory view schematically showing an unbalance correction means for a conventional test body.

[Explanation of symbols]

 1 Rotation pulse sensor 2 Tracking filter 3 Sync signal generator 4 Vibration detector 5 Variable gain amplifier 6 AD converter 7 Interface 8 CPU 9 Memory 10 LCD display 11 LED display 12 Keyboard 13 Reference line

Claims (4)

[Claims] 1. A test body is provided with an unbalance amount detecting means for rotating the test body to detect an unbalance amount of the test body, and for correcting the unbalance amount detected by the unbalance amount detecting means. A memory that stores the data of the relationship between a plurality of unbalance correction directions having the predetermined angular intervals set above and the predetermined unbalance correction amount in each of the correction directions, and the data in the memory is referred to. First computing means for determining the minimum number of correction component forces in the correction direction of the predetermined angular interval for correcting the detected unbalance amount, and the predetermined unbalance among the minimum number of correction component forces. The second computing means for obtaining the midway correction component force that is less than the balance correction amount and the system of the minimum number of correction component forces including the above midway correction component force are used to cancel the unbalance amount. An unbalanced optimum correction means determination device, comprising: a third calculation means for obtaining a relative angle of the system with respect to a vector of a balance amount with respect to a reference line. 2. The unbalance optimum correction means determining device according to claim 1, wherein when the angular interval is α and the predetermined unbalance correction amount is U, 1, 2, and i
Unbalance amounts N ₁ and N _{2 that} can be respectively corrected by U
And a table of N _i are set by the following formula [Equation 1], and the table is stored in the memory, the unbalanced optimum correction means determination device. N ₁ = UN ₂ = 2U cos (α / 2) i ≧ 3 N _i = N _i−2 +2 U cos {α (i−1) / 2} 3. The unbalance optimum correction means determining device according to claim 1, wherein the unbalance amount detected by the unbalance amount detecting means is U ₀ , and the angular interval is α.
When the minimum number is j and the unbalance correction amount by the predetermined unbalance amount of (j-1) is U ₁ , the midway correction component force U ₂ is calculated by the second calculation means as follows. An unbalanced optimum correction means determination device characterized by being obtained by the equations [Equation 2] and [Equation 3]. Φ = 180 ° −jα / 2 Equation 3 4. The unbalanced optimum correction means determining device according to claim 3, wherein the angle formed by the vector of U ₀ and the reference line is θ _0, and the sandwiching angle of each vector of U ₀ and U ₁ is set. Where θ is θ, the angle θ ₁ formed by the minimum number of corrected component force systems and the reference line is obtained by the third computing means by the following equations [4] and [5]. An unbalanced optimum correction means determination device characterized by the above. [Equation 4] U ₂ ² = U ₀ ² + U ₁ ² -2U ₀ U ₁ cos θ [Equation 5] θ ₁ = θ ₀ -{(j-1) α / 2 + θ}