JP2021096238A - Excitation capability prediction/evaluation device, excitation capability prediction/evaluation method, and excitation capability prediction/evaluation program for vibration test - Google Patents

Abstract

To provide an excitation capability prediction/evaluation device, an excitation capability prediction/evaluation method, and an excitation capability prediction/evaluation program which predict excitation specification required for a vibration test so as to quickly and precisely select a vibration test device and determine whether or not the vibration test can be performed by an owned vibration test device.SOLUTION: An excitation capability prediction/evaluation method for predicting and evaluating excitation capability required in a vibration test calculates the excitation capability on the basis of previously-obtained data on transmission properties of one or more vibration test devices and information on a test object and vibration test conditions.SELECTED DRAWING: Figure 1

Description

The present invention quickly and reliably selects an appropriate vibration test device and determines whether or not a vibration test can be performed when performing a vibration test such as a vibration characteristic test or a durability test of an industrial product. It relates to a vibration capacity prediction evaluation device, a vibration capacity prediction evaluation method, and a vibration capacity prediction evaluation program.

Conventionally, a vibration test using a vibration test device has been performed in order to perform a vibration characteristic test or a durability test of industrial products such as aerospace equipment, automobile equipment, electronic products, and precision equipment.

The vibration test device 100 for performing a vibration test includes, for example, as shown in FIG. 3, a movable portion 102 on which the test object T is mounted and a fixed portion 114 having a magnetic path member 116. ..
The fixing portion 114 includes, for example, a magnetic path member 116 made of a material having magnetic permeability such as iron, and an exciting coil 118 that generates a magnetic flux flowing through the magnetic path member 116. The exciting coil 118 causes a constant magnetic flux to flow through the magnetic path member 116 by applying a DC voltage from a constant voltage source (not shown).

On the other hand, the movable portion 102 includes a test table 104 on which the test piece T is mounted, a movable portion support spring 106 that connects the movable portion 102 and the fixed portion 114 to hold the movable portion 102 in a movable state, and a magnetic path. It includes a drive coil 108 that is inserted into the gap of the member 116.

The drive coil 108 is attached so as to be orthogonal to the magnetic field (static magnetic field) generated by the exciting coil 118, and the movable portion 102 can be vibrated by passing an alternating current through the drive coil 108. By changing the magnitude of the alternating current flowing through the drive coil 108, the magnitude of the generated vibration (excitation force) can be controlled.

When a random vibration test is performed on the test object T using such a vibration test device 100, the alternating current applied to the drive coil 108 is PSD (power spectral density) according to the vibration test pattern given to the test object T. It is applied to the drive coil 108 as an electrical signal based on the profile. Further, when performing a sine vibration test or a shock vibration test, an alternating current is applied to the drive coil 108 as an electric signal based on information on the vibration test pattern.

The acceleration, velocity, exciting force, displacement, etc. generated by the vibration test device 100 are configured to be acquired by using the acceleration pickup 105 provided on the test table 104.

In the case of the random vibration test, the PSD profile of the test conditions is a spectral density function indicating the acceleration per unit frequency width, but when the distribution is uneven, the excitation force generated by the vibration test device 100 is used. I can't figure it out. For this reason, it was not possible to immediately grasp what specifications the vibration test device should be used for the vibration test and whether the vibration test device owned by the company could be used for the vibration test.

Also, in the case of the sine vibration test and the shock vibration test, the current and voltage required to be applied to the vibration test device differ depending on the frequency band required for the vibration test, as in the random vibration test, and the accuracy required for the vibration test is correct. Since it is difficult to grasp the current and voltage, it was not possible to immediately grasp whether or not the vibration test can be performed with the vibration test equipment owned.

Therefore, conventionally, for example, by setting the capacity of the test condition to 50% and moving each vibration test device 100, the values of the applied voltage and the applied current input to the drive coil 108 of the vibration test device 100 are used. From, the vibration specifications such as maximum vibration force, maximum acceleration, and maximum displacement are calculated, and by comparing the calculated vibration specifications with the specifications of the actual vibration test equipment, the vibration test equipment can be selected and the vibration test equipment can be selected. It is judged whether or not the desired vibration test can be performed with the vibration test equipment owned.

In view of such a current situation, the present invention predicts the vibration spec required for the vibration test based on the information on the test object and the information on the vibration test pattern, and quickly and surely obtains the vibration test apparatus. Vibration capacity prediction evaluation device, vibration capacity prediction evaluation method, and vibration capacity prediction that can make selections and quickly and reliably determine whether or not a vibration test can be performed with the vibration test equipment that you own. The purpose is to provide an evaluation program.

The present invention has been invented in order to solve the above-mentioned problems in the prior art, and the excitation ability prediction evaluation device of the present invention is used.
It is a vibration capacity prediction evaluation device that predicts and evaluates the vibration capacity required in the vibration test.
Input means for inputting information on the test object and information on vibration test conditions,
A calculation means for predicting and evaluating the vibration capability based on the information on the test object and the information on the vibration test conditions.
Equipped with an output means for outputting the predicted and evaluated vibration capability,
The calculation means is
It is configured to calculate the vibration capability based on the data on the transmission characteristics of one or more vibration test devices acquired in advance, the information on the test object, and the information on the vibration test conditions. It is characterized by.

In such a vibration capacity prediction evaluation device,
The calculation means can be configured to determine whether or not the vibration test can be performed based on the specifications of the vibration test device and the calculated vibration capacity.

In this case, a storage means for storing the specifications of the vibration test device can be provided.
In addition, a storage means for storing data relating to the transmission characteristics of the vibration test apparatus can be provided.

The vibration capability prediction evaluation method of the present invention is
It is a vibration capacity prediction evaluation method that predicts and evaluates the vibration capacity required in a vibration test.
It is characterized in that the vibration capacity is calculated based on the data regarding the transmission characteristics of one or more vibration test devices acquired in advance, the information regarding the test object, and the information regarding the vibration test pattern.

In such a vibration capacity prediction evaluation method,
Based on the specifications of the vibration test device and the calculated vibration capacity, it can be determined whether or not the vibration test can be performed.

In addition, the vibration capacity prediction evaluation program of the present invention
This is a program for executing any of the above-mentioned vibration capability prediction evaluation methods by a computer.

A computer-readable recording medium on which such a program is recorded is also included as one aspect of the present invention.

According to the present invention, the vibration specs required for the vibration test can be predicted based on the information about the test object and the information about the vibration test conditions, and can be easily compared with the specs of a plurality of vibration test devices. can do. Therefore, it is possible to quickly and surely select a vibration test device and determine whether or not a desired vibration test can be performed with the own vibration test device.

FIG. 1 is a schematic diagram for explaining a configuration for predicting and evaluating the vibration capacity of a vibration test device using the vibration capacity prediction evaluation device of the present invention. FIG. 2 is a flowchart for explaining a flow for obtaining a judgment result as to whether or not a vibration test can be performed by using the vibration capacity prediction evaluation device of the present embodiment. FIG. 3 is a schematic diagram for explaining an example of the vibration test apparatus.

Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a schematic diagram for explaining a configuration for predicting and evaluating the vibration capacity of a vibration test device using the vibration capacity prediction evaluation device of the present invention.

Since the vibration test device 100 used in the present embodiment has the same configuration as the conventional vibration test device 100 described above, the same components are designated by the same reference numerals, and detailed description thereof will be omitted. In the present embodiment, as the vibration test device 100, an electrokinetic vibration test device is given as an example, but an induction type vibration test device can also be used in the same manner.

Further, in the present embodiment, a random vibration test using the vibration test device 100 is described as an example, but other vibration tests such as a sine vibration test and a shock vibration test can be performed in the same manner. it can.

The vibration capability prediction evaluation device 10 of the present embodiment is composed of a computer system including input / output means 12, calculation means 14, and storage means 16. The computer system may be a stand-alone computer, a client-server system, a WEB system, or the like.

As will be described later, the storage means 16 of the vibration capacity prediction evaluation device 10 stores a vibration capacity prediction evaluation program for predicting and evaluating the vibration capacity of the vibration test device 100, and the test object to be input is input by the user. The vibration test apparatus 100 is configured to calculate the excitation capacity based on the vibration test conditions including the information regarding the vibration test device and the information regarding the vibration test pattern.

Further, in the vibration capacity prediction evaluation device 10 of the present embodiment, the specifications of the vibration test device 100, data related to the transmission characteristics of the vibration test device 100 acquired in advance, and the like are stored in the storage means 16. However, data related to the specifications and transmission characteristics of the vibration test device 100 can be configured to be input by the user using the input / output means 12 (for example, a keyboard, a mouse, etc.).

As the specifications of the vibration test device 100, for example, the maximum vibration force and frequency range in the vertical direction and the horizontal direction, the maximum acceleration, the maximum speed, the maximum displacement, the maximum load mass, the weight and size of the test table 104, and the like are used. Can be done. On the other hand, data on the transmission characteristics of the vibration test device 100 can be obtained as follows.

First, a vibration test is performed under predetermined vibration conditions without placing anything on the test table 104 of the vibration test device 100, that is, with no load (mass m0), and the test table 104 is used with the acceleration pickup 105. Acquires the exciting force and acceleration generated in the vibration test, and acquires the transmission characteristics during the vibration test.

Next, a vibration test is performed under the same vibration conditions with a load of an arbitrary mass m1 placed on the test table 104 of the vibration test device 100, and the transmission characteristics at this time are acquired. Here, as the transmission characteristics, for example, the output voltage transmission rate (output voltage PSD / test target acceleration PSD), which is the ratio of the actually measured output voltage PSD to the test target acceleration PSD, and the actually measured output current PSD and the test target acceleration PSD. The output current transmission rate (output current PSD / test target acceleration PSD), which is the ratio of the above, can be used.

In this way, by performing the vibration test under the same vibration conditions under the states of mass m0 and mass m1, the transmission characteristics change according to the difference in mass. Therefore, as the transmission characteristics, the output voltage transmission rate VTm0 when no load is applied, the output voltage transmission rate VTm1 when a load of arbitrary mass m1 is loaded, the output current transmission rate CTm0 when no load is installed, and the load of any mass m1 are installed. The output current transmission rate CTm1 of the above is acquired for each vibration test device 100, and the vibration test device 100 and the transmission characteristic are associated with each other and stored in the vibration capability prediction evaluation device 10.

Further, as the transmission characteristic, it is preferable to acquire the damping constant and the like peculiar to the vibration test device 100 in advance. For example, the damping constant can be calculated from the displacement at the time when the signal input is stopped after the sine vibration signal is input to the vibration test device 100, and the displacement after a predetermined time elapses after the signal input is stopped. .. However, if there is no large difference in the damping constants of each vibration test device, it is not necessary to acquire the damping constants for each vibration test device.

As the vibration conditions for obtaining the transmission characteristics in this way, it is preferable that all the vibration test devices for which the transmission characteristics should be obtained are the vibration conditions that can be vibrated under the same conditions.

Whether or not the user can perform a vibration test under arbitrary vibration conditions on an arbitrary test object T as follows using the vibration capacity prediction evaluation device 10 configured in this way. You can make a judgment.

FIG. 2 is a flowchart for explaining a flow for obtaining a determination result of whether or not a vibration test can be performed by using the vibration capacity prediction evaluation device 10 of the present embodiment.

The user first selects the vibration test device 100 that predicts and evaluates the vibration capability (S1). In the present embodiment, the specifications of each vibration test device 100 are stored in the vibration capability prediction evaluation device 10 in advance, and the input / output means is used from among those displayed on the display means of the vibration test device 10. Although it is configured to be selected, it is also possible to configure the specifications of the vibration test device 100 for predicting and evaluating the vibration capability to be input to the vibration test device 10 using input / output means.

Next, as information about the test object, the mass mr of the test object T is input by using the input / output means (S2). Further, as information on the vibration test conditions, the test conditions required for the vibration test are input by using the input / output means (S3). The vibration capacity prediction evaluation device 10 calculates the vibration capacity based on the input test conditions (S4).

The test conditions to be input in S3 and the calculation of the vibration capacity to be performed in S4 differ depending on the random vibration test, the sine vibration test, and the shock vibration test. Specifically, the test conditions are input as follows. , The vibration capacity is calculated.

(1) Random vibration test When performing a random vibration test, enter the test target acceleration PSD profile as a test condition.

The target output voltage PSD and output voltage effective value Erms, target output current PSD, and output current effective value Irms when the test object T having mass mr is placed on the test table 104 are the following equations (1) and (2), respectively. ), (3), (4).

ここで、

であり、出力電圧実効値Ｅrmsは、

によって表される。

here,

And the output voltage effective value Erms is

Represented by.

ここで、

であり、出力電流実効値Ｉrmsは、

によって表される。

here,

And the output current effective value Irms is

Represented by.

The effective output voltage value E ₁ rms and the effective output current value Irms are obtained by the root mean square value. Further, Δf is a unit frequency width in PSD.

The excitation ability prediction evaluation device 10 has the target output voltage PSD and the target output voltage PSD based on the input information on the test object, the information on the vibration test pattern as the vibration test conditions, and the transmission characteristic equations (1) and (3). The target output current PSD is calculated, and the output voltage effective value Erms and the output current effective value Irms are calculated based on the effective value calculation formulas (2) and (4).

Further, the effective acceleration value, the velocity peak value, and the displacement peak-to-peak value are calculated from the test target acceleration PSD. The acceleration effective value, the velocity effective value, and the displacement effective value can be calculated from the test target acceleration PSD by a known calculation formula. The velocity peak value can be obtained by multiplying the velocity effective value by the conversion coefficient determined by the attenuation constant or the like acquired in advance. Further, the displacement peak-to-peak value can be obtained by multiplying the displacement effective value by a conversion coefficient determined by a damping constant or the like acquired in advance.

(2) In the case of the sine vibration test When performing the sine vibration test, the test target acceleration, target speed, and target displacement at each frequency for the vibration test are input as test conditions.

With the test piece T of mass mr placed on the test table 104, the target output voltage effective value Ef1rms and the target output current effective value If1rms at an arbitrary frequency f1 [Hz] are shown in the following equations (5) and (5), respectively. It has the relationships of 6), (7), and (8).

ここで、

であり、振動試験に必要な最大出力電圧実効値Ｅrmsは、

によって表される。

here,

The maximum output voltage effective value Erms required for the vibration test is

Represented by.

ここで、

であり、振動試験に必要な最大出力電流実効値Ｉrmsは、

によって表される。

here,

The maximum output current effective value Irms required for the vibration test is

Represented by.

Note that E (f) and I (f) in (6) and (8) are functions of the frequency f shown in the transfer characteristic equations (5) and (7), and the maximum voltage Erms required for vibration is the maximum. The current Irms is the maximum value of the transfer characteristic equations (5) and (7) in the frequency range of the test conditions.

The vibration capacity prediction evaluation device 10 is based on the input information on the test object, the vibration test pattern or the vibration condition as the vibration test condition, and the transmission characteristic equations (5) and (7). Calculate the target output voltage and target output current corresponding to each frequency of, and calculate the maximum value of the voltage and current in the frequency range of the test conditions based on the calculation formulas (6) and (8). The effective value Erms and the maximum output current execution value Irms are calculated.

Further, the acceleration peak value, the velocity peak value, and the displacement peak-to-peak value in the frequency range of the test condition are calculated from the vibration test pattern or the vibration condition. Acceleration, velocity, and displacement peak-to-peak values can be calculated from the frequency of the test conditions, and the maximum value of acceleration, maximum velocity, and maximum displacement peak-to-peak value should be obtained in the frequency range of the test conditions. Can be obtained by

(3) In the case of shock vibration test When a sine half wave is used as the shock vibration test, the working time of the test conditions when the test object T having a mass mr is placed on the test table 104 is converted into a sine wave. The frequency f1 at that time is calculated, and the target output voltage execution value Ef1rms and the target output execution value If1rms at that frequency f1 have relationships such as the following equations (9), (10), (11), and (12), respectively. Have.

ここで、

であり、振動試験に必要な最大出力電圧実行値Ｅrmsは、

によって表される。

here,

The maximum output voltage effective value Erms required for the vibration test is

Represented by.

ここで、

であり、試験に必要な最大出力電流実行値Ｉrmsは、

によって表される。

here,

And the maximum output current run value Irms required for the test is

Represented by.

The vibration capability prediction evaluation device 10 includes input information on the test object, information on the maximum acceleration and action time of the test waveform under the test conditions as vibration test conditions, and transmission characteristic equations (9) and (11). The target output voltage and target output current corresponding to the frequency of the sine wave calculated from the action time are calculated based on the above, and the maximum output voltage effective value Erms required for the test is calculated based on the calculation formulas (10) and (12). And the maximum output current execution value Irms is calculated.

In addition, the velocity peak value and displacement peak-to-peak value required for the test conditions are calculated from the maximum acceleration and action time of the test waveform. Utilizing that the velocity peak value and the displacement peak-to-peak value are functions depending on the action time, a calculation formula showing the relationship between the velocity peak value and the action time and the displacement peak-to-peak value and the action time is calculated in advance. It can be created and calculated by the formula.

A vibration test device in which the vibration capacity (acceleration effective value, velocity peak value, displacement peak-to-peak value, output voltage effective value, output current effective value) calculated in this way is stored in the vibration capacity prediction evaluation device 10. By comparing with the limit values (maximum acceleration, maximum speed, maximum displacement, maximum voltage value, maximum current value) in the specifications of 100 (S5), the exciting capacity exceeded the limit values in the specifications of the vibration test device 100. In this case, it is determined that the desired vibration test cannot be performed, and the vibration capability prediction evaluation device 10 notifies that fact by using the input / output means 12 (for example, a display, a printer, etc.) (S6). It is composed of.

By using the vibration capacity prediction evaluation device 10 configured in this way, the user selects the vibration test device for which the desired vibration test is to be performed, and also provides information on the test object to be subjected to the vibration test and the desired vibration. By simply inputting information about the vibration test pattern for the test, it is possible to quickly and reliably determine whether the desired vibration test can be performed by the selected vibration test device.

In this embodiment, it is desired to calculate the vibration capacity only for the selected vibration test device and compare the calculated vibration capacity with the limit value in the specifications of the selected vibration test device. It is judged whether or not it is possible to perform a vibration test. For example, the vibration capacity is calculated for all the vibration test devices registered in the vibration capacity prediction evaluation device 10, and the calculated vibration capacity is used. By comparing with the limit value in the specifications of each vibration test device, a vibration test device capable of performing a desired vibration test is selected from the vibration test devices registered in the vibration capacity prediction evaluation device 10. It can also be configured as follows.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this, and for example, in the above embodiment, various modifications can be made without departing from the object of the present invention.

Further, for example, a magnetic tape (digital data storage (DDS), etc.), a magnetic disk (hard disk drive (HDD), flexible disk (FD), etc.), an optical disk (compact disk (compact disk), etc.) on which the above-mentioned vibration capability prediction evaluation program is recorded. Computer-readable recording media such as CD), digital versatile disc (DVD), Blu-ray disc (BD), optical magnetic disc (MO), flash memory (SSD (Solid State Drive), memory card, USB memory, etc.) It is included as one aspect of the invention.

10 Vibration capacity prediction evaluation device 12 Input / output means 14 Calculation means 16 Storage means 100 Vibration test device 102 Movable part 104 Test stand 105 Accelerometer 106 Movable part support spring 108 Drive coil 114 Fixed part 116 Magnetic path member 118 Excitation coil

Claims (8)

It is a vibration capacity prediction evaluation device that predicts and evaluates the vibration capacity required in the vibration test.
Input means for inputting information on the test object and information on vibration test conditions,
A calculation means for predicting and evaluating the vibration capability based on the information on the test object and the information on the vibration test conditions.
Equipped with an output means for outputting the predicted and evaluated vibration capability,
The calculation means is
It is configured to calculate the vibration capability based on the data on the transmission characteristics of one or more vibration test devices acquired in advance, the information on the test object, and the information on the vibration test conditions. Vibration capacity prediction evaluation device. The calculation means is
The first aspect of the present invention, wherein it is configured to determine whether or not the vibration test can be performed based on the specifications of the vibration test apparatus and the calculated vibration capacity. Vibration capacity prediction evaluation device. The vibration capacity prediction evaluation device according to claim 2, further comprising a storage means for storing the specifications of the vibration test device. The vibration capacity prediction evaluation device according to any one of claims 1 to 3, further comprising a storage means for storing data relating to transmission characteristics of the vibration test device. It is a vibration capacity prediction evaluation method that predicts and evaluates the vibration capacity required in a vibration test.
The vibration ability is characterized by calculating the vibration ability based on the data on the transmission characteristics of one or more vibration test devices acquired in advance, the information on the test object, and the information on the vibration test conditions. Predictive evaluation method. The vibration capacity prediction evaluation according to claim 5, wherein it is determined whether or not the vibration test can be performed based on the specifications of the vibration test device and the calculated vibration capacity. Method. A program for causing a computer to execute the vibration capability prediction evaluation method according to claim 5 or 6. A computer-readable recording medium on which the program according to claim 7 is recorded.

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