Method and device for testing damping performance of particle damper, computer program product

Abstract

The application discloses a particle damper damping performance test method and device, and a computer program product. The fixed end of the particle damper mounting substrate of the test device is arranged on a fixed support, and the free end of the particle damper mounting substrate is arranged away from the fixed support. The excitation unit is used to be connected with the excitation input point of the particle damper mounting substrate to send an excitation signal to the particle damper mounting substrate. The detection unit is arranged on the particle damper mounting substrate and is used to detect the acceleration change caused by the excitation signal. The control unit is used to obtain the first modal damping ratio of the particle damper mounting substrate and the second modal damping ratio after placing the particle damper to be tested according to the vibration frequency response curve obtained from the acceleration change. By comparing the first modal damping ratio and the second modal damping ratio, the test precision can be effectively improved, and good technical support is provided for evaluating the damping performance of the particle damper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of particle damper test, in particular to a particle damper damping performance test method and device, and a computer program product. BACKGROUND

[0002] Particle dampers are effectively applied in different vibration and energy absorption application scenarios, such as but not limited to particle dampers suitable for bearing systems. In actual application, the damping performance of the particle damper is an important indication of the vibration and noise and impact energy absorption capacity of the particle damper, and accurate acquisition of the damping performance of the particle damper can provide a scientific basis for damper design and evolution.

[0003] Therefore, it is urgent to optimize the damping performance test scheme of the particle damper to meet the use needs of different application scenarios. SUMMARY

[0004] To solve the above technical problems, the present application provides a particle damper damping performance test method and device, and a computer program product, to effectively improve the test precision and provide a good technical guarantee for evaluating the damping performance of the particle damper.

[0005] The present application provides a particle damper damping performance test device, comprising a fixed support, a particle damper mounting base, an excitation unit, a detection unit and a control unit; the particle damper mounting base is used for placing a particle damper to be tested, the fixed end of the particle damper mounting base is arranged on the fixed support, and the free end of the particle damper mounting base is arranged away from the fixed support; the excitation unit is used for connecting with the excitation input point of the particle damper mounting base to send an excitation signal to the particle damper mounting base; the detection unit is arranged on the particle damper mounting base and is used for detecting the acceleration change caused by the excitation signal; and the control unit is used for obtaining the first modal damping ratio of the particle damper mounting base and the second modal damping ratio after placing the particle damper to be tested according to the vibration frequency response curve obtained from the acceleration change.

[0006] Optionally, the particle damper mounting base is arranged on the fixed support in a vertical direction, and the excitation input point is located at the free end of the particle damper mounting base.

[0007] Optionally, an elastic pad is arranged between the fixed end of the particle damper mounting base and the fixed support.

[0008] Optionally, the natural frequency of the fixed support is greater than 1.1 times the test frequency range of the particle damper to be tested, or less than 0.9 times the test frequency range of the particle damper to be tested.

[0009] Optionally, the particle damper mounting substrate is a rectangular plate, and the length and width of the particle damper mounting substrate are 3 times or more of the length and width of the particle damper, respectively.

[0010] Optionally, the excitation unit comprises an exciter, an amplifier and a signal generator, the output end of the signal generator is connected to the receiving end of the exciter through the amplifier, the signal generator is used to send a trigger signal, and the trigger signal is sent to the exciter through the amplifier for amplification, and the excitation signal is sent through the exciter.

[0011] Optionally, the detection unit is a vibration acceleration sensor.

[0012] The present application also provides a particle damper damping performance test method, the test method comprising the following steps:

[0013] The excitation unit is started to send an excitation signal to excite the particle damper mounting substrate, the vibration frequency response curve is obtained according to the acceleration signal detected by the detection unit, and the first modal damping ratio of the particle damper mounting substrate is calculated and obtained.

[0014] The particle damper to be tested is placed on the particle damper mounting substrate, the excitation unit is started to send an excitation signal to excite the particle damper mounting substrate, the vibration frequency response curve is obtained according to the acceleration signal detected by the detection unit, and the second modal damping ratio after the particle damper to be tested is placed is calculated and obtained.

[0015] Optionally, for the rectangular particle damper mounting substrate, the placement position of the particle damper to be tested on the particle damper mounting substrate is determined according to the modal vibration mode:

[0016] When testing the first-order modal damping ratio, the particle damper should be placed at (i, j) of the particle damper mounting substrate;

[0017] When testing the second-order modal damping ratio, the particle damper should be placed at or of the particle damper mounting substrate;

[0018] When testing the third-order modal damping ratio, the particle damper should be placed at or of the particle damper mounting substrate;

[0019] When testing the fourth-order modal damping ratio, the particle damper should be placed at or or or of the particle damper mounting substrate;

[0020] wherein the pair of sides of the rectangular particle damper mounting substrate is 2i, and the other pair of sides is 2j.

[0021] Optionally, the arithmetic mean of the first modal damping ratios obtained according to multiple tests is calculated as the first modal damping ratio of the particle damper mounting substrate; and the arithmetic mean of the second modal damping ratios obtained according to multiple tests is calculated as the second modal damping ratio after the particle damper under test is placed.

[0022] The present application also provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the particle damper damping performance test method as described above.

[0023] Compared with the prior art, the present application provides a particle damper damping performance test device using the resonance method. Specifically, under controlled environmental conditions, a single point translation excitation is performed on the particle damper by an exciter, and the vibration frequency response curve is measured. By analyzing the vibration frequency response curve, the corresponding modal damping ratio is calculated using the half-power bandwidth method. Based on the first modal damping ratio of the particle damper mounting substrate and the second modal damping ratio after the particle damper under test is placed, the damping performance of the particle damper is accurately evaluated. Overall, the test precision requirement can be guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A structural schematic diagram of a particle damper damping performance test device provided by an embodiment of the present application;

[0025] Figure 2 A structural schematic diagram of another particle damper damping performance test device provided by an embodiment of the present application;

[0026] Figure 3 A placement coordinate system schematic diagram of a rectangular particle damper mounting substrate provided by an embodiment of the present application;

[0027] Figure 4 A block diagram of a particle damper damping performance test method provided by an embodiment of the present application;

[0028] Figure 5 A vibration frequency response curve obtained by exciting the particle damper mounting substrate in an embodiment of the present application;

[0029] Figure 6 A vibration frequency response curve obtained by exciting the particle damper mounting substrate and the particle damper under test in an embodiment of the present application.

[0030] In the drawings:

[0031] The fixed support 10, the particle damper mounting substrate 20, the excitation unit 30, the exciter 31, the amplifier 32, the signal generator 33, the detection unit 40, the control unit 50, the particle damper 60, and the elastic pad 70. DETAILED DESCRIPTION

[0032] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0033] As a device for reducing vibration and absorbing vibration or impact energy, the particle damper is usually composed of a container filled with particulate matter (i.e. damping particles). Accurate acquisition of the damping performance of the particle damper can accurately reflect its ability to absorb vibration noise and impact energy in actual application, and can provide a scientific basis for damper design and improvement.

[0034] Based on this, the present application provides a particle damper damping performance testing device. Please refer to Figure 1 , which is a structural schematic diagram of a particle damper damping performance testing device provided by the present application.

[0035] As Figure 1 shown, the particle damper damping performance testing device includes a fixed support 10, a particle damper mounting substrate 20, an excitation unit 30, a detection unit 40, and a control unit 50.

[0036] Among them, the fixed support 10 is a basic bearing fixed structure, mainly used for mounting the particle damper mounting substrate 20. One end of the particle damper mounting substrate 20 is fixed to the fixed support 10, that is, the fixed end; the other end of the particle damper mounting substrate 20 is away from the fixed support, that is, the free end.

[0037] In order to avoid abnormal vibration, the fixed support 10 is greater than 1.1 times the test frequency range of the particle damper to be tested, or less than 0.9 times the test frequency range of the particle damper to be tested, on the basis of avoiding abnormal vibration, the stability and safety can be further improved.

[0038] In order to further enhance the stability of the test system, an elastic pad can be provided between the particle damper mounting substrate 20 and the fixed support 10. Please refer to Figure 2 , which is a structural schematic diagram of another particle damper damping performance testing device provided by the present application. In order to clearly show the difference and connection between the present embodiment and the Figure 1 described scheme, the same function or structure is shown in the figure with the same mark.

[0039] As Figure 2As shown, the elastic pad 70, such as but not limited to a rubber pad, is arranged between the fixed end of the particle damper mounting substrate 20 of the particle damper damping performance test device and the fixed support 10. The connection between the fixed support 10 and the particle damper mounting substrate 20 is achieved through the elastic pad 70, which can increase the stability of the system and avoid excessive connection affecting the vibration of the particle damper mounting substrate 20.

[0040] In a specific implementation, the particle damper mounting substrate 20 can be vertically mounted on the fixed support 10 for mounting the particle damper 60 to be tested. In other words, as shown in FIG. 1, the particle damper mounting substrate 20 is vertically mounted on the fixed support 10. Figure 1 As shown, the upper end of the particle damper mounting substrate 20 is a fixed end, and the lower end is a free end. The particle damper 60 is mounted at the vertical central position of the particle damper mounting substrate 20, thereby forming a test system.

[0041] In other possible implementations, the particle damper mounting substrate 20 can also be placed horizontally. Compared with the particle damper mounting substrate 20 vertically mounted on the fixed support 10, the particle damper mounting substrate 20 can reduce the influence of the test accuracy in the cantilever state of the particle damper mounting substrate 20.

[0042] Further, in order to fully exert the function of the particle damper 60, the size of the particle damper mounting substrate 20 is greater than the mounting size of the particle damper 60. For the particle damper mounting substrate 20, it can be a rectangular substrate or a substrate of other shapes.

[0043] Taking the rectangular particle damper mounting substrate 20 as an example, the length and width dimensions of the particle damper mounting substrate 20 can be 3 times or more of the length and width dimensions of the particle damper 60. As a preferred, the length of the particle damper mounting substrate 20 is about 3.5 times to 4.5 times of the long side of the particle damper, and the width of the particle damper mounting substrate 20 is about 3 times to 4 times of the short side of the particle damper.

[0044] For the rectangular particle damper mounting substrate 20, the placement position of the particle damper 60 to be tested on the particle damper mounting substrate 20 can be determined according to the modal shape. Please refer to FIG. 2 for details. Figure 3 The figure is a placement coordinate system diagram of a rectangular particle damper mounting substrate. Figure 3 As shown in FIG. 2, one pair of edges of the rectangular particle damper mounting substrate 20 has a length of 2i, and the other pair of edges has a length of 2j. The placement coordinate system of the particle damper takes the lower left corner of the particle damper mounting substrate 20 as the coordinate origin o, the direction of the length of 2i as the horizontal coordinate x, and the direction of the length of 2j as the vertical coordinate y.

[0045] In a specific implementation, the placement position of the particle damper 60 on the particle damper mounting substrate 20 can be determined according to the measured vibration mode of any order. For example, but not limited to, the following modal determination methods:

[0046] When testing the first-order modal damping ratio, the particle damper should be placed at (i, j) of the particle damper mounting substrate;

[0047] When testing the second-order modal damping ratio, the particle damper should be placed at or of the particle damper mounting substrate;

[0048] When testing the third-order modal damping ratio, the particle damper should be placed at or of the particle damper mounting substrate;

[0049] When testing the fourth-order modal damping ratio, the particle damper should be placed at or or or of the particle damper mounting substrate.

[0050] The excitation unit 30 provides vibration excitation. During testing, the excitation unit 30 is used for excitation, and the vibration frequency response curve of the particle damper mounting substrate 20 is obtained. Specifically, the excitation unit 30 can include an exciter 31, an amplifier 32, and a signal generator 33. The output end of the signal generator 33 is connected to the receiving end of the exciter 31 through the amplifier 32. The signal generator 33 is used to send a trigger signal, which is amplified by the amplifier 32 and then transmitted to the exciter 31. The exciter 31 sends an excitation signal to excite the particle damper mounting substrate 20.

[0051] Preferably, the exciter 31 can be a vibration exciter that meets the requirements of GB / T 11349.2. In actual application, the exciter 31 does not produce additional mass and additional stiffness to the test piece (the particle damper mounting substrate 20 and the particle damper 60) after being connected to the particle damper mounting substrate 20.

[0052] Specifically, in the vibration test system, the exciter 31 generates a sine wave vibration signal of a certain frequency and amplitude, which is transmitted to the particle damper mounting substrate 20, so that the particle damper mounting substrate 20 generates a corresponding vibration response. In a specific implementation, the exciter 31 can be connected to the free end of the particle damper mounting substrate 20, in other words, the excitation input point is located at the free end of the particle damper mounting substrate 20.

[0053] The detection unit 40 can be arranged on the particle damper mounting substrate 20 to detect the acceleration change to obtain the vibration frequency response curve. In a specific implementation, the detection unit 40 can be a vibration acceleration sensor to accurately obtain the acceleration change of the particle damper mounting substrate 20 during the test. When the excitation occurs, the object will be suddenly affected by the acceleration change. Taking a piezoelectric vibration acceleration sensor as an example, the sensor arranged on the particle damper mounting substrate 20 will perceive the acceleration change and generate a corresponding charge signal. The charge signal generated by the electrode pair is collected and measured. On this basis, the change of the charge signal is recorded and analyzed in time, and the acceleration signal obtained by the detection can be used to obtain the vibration frequency response curve of the particle damper 60 through frequency domain analysis or self-spectrum analysis.

[0054] Specifically, the detection unit 40 can be based on the ICP (Integrated Circuit Piezoelectric) technology to integrate the piezoelectric vibration acceleration sensor and the charge amplifier together. In this way, the signal amplification with high gain and low noise can be provided, and the weak charge signal of the piezoelectric acceleration sensor can be converted into a reliable voltage signal output. In a specific implementation, the vibration acceleration sensor (40) can be implemented according to the prior art, which will not be described here.

[0055] Exemplarily, the vibration acceleration sensor can be configured as a sensor with a range of not less than 50g (g is the unit of gravitational acceleration) and a frequency range of 2Hz-5000Hz to meet the needs of different test scenarios. It has good adaptability.

[0056] Exemplarily, the mass of the vibration acceleration sensor can be not greater than 7g (grams), so that the acceleration signal detection function can be realized reliably while avoiding the influence of the heavy sensor on the detection accuracy.

[0057] Based on the detection unit 40, the acceleration change of the particle damper mounting substrate 20 after being excited can be measured, and the modal damping ratio z is calculated according to the following formula (1):

[0058]

[0059] In formula (1):

[0060] ζ--modal damping ratio;

[0061] f1, f2--frequency values at half-power points of the structure vibration frequency response curve; here, for the first modal damping ratio of the particle damper mounting substrate 20, the structure is the particle damper mounting substrate 20; for the second modal damping ratio after placing the particle damper to be tested, the structure is the particle damper mounting substrate 20 and the particle damper 60 to be tested;

[0062] f0-- is the natural frequency of the structure.

[0063] In order to improve the test accuracy, the arithmetic mean of the modal damping ratio of the particle damper obtained by formula (2) can be further calculated

[0064]

[0065] In formula (2):

[0066] -- is the arithmetic mean of the modal damping ratio;

[0067] ζ i -- is the modal damping ratio calculated by formula (1).

[0068] It should be understood that the first modal damping ratio and the second modal damping ratio can both obtain the corresponding arithmetic mean based on formula (2).

[0069] The "modal damping ratio" here refers to the ratio between the actual damping of the structure and the critical damping. The "critical damping" is the minimum amount of damping required for the system to return to a stationary state without oscillating after being excited. It can be understood that the critical damping is the most ideal state of the system. If the actual damping of the system is less than the critical damping, it will be under-damped, and the system will oscillate for a period of time and then gradually return to the equilibrium position; if the actual damping of the system is greater than the critical damping, it will be over-damped, and the system will slowly return to the equilibrium position without oscillation but with relatively slow speed.

[0070] It should be understood that the above formula (2) is to calculate the obtained modal damping ratio by testing 5 times, and then calculate the average. In actual application, it is not limited to 5 effective tests, and the actual test times can be determined according to the needs, and the embodiments of the present application are not limited.

[0071] Based on the particle damper damping performance test device described above, the present application further provides a particle damper damping performance test method.

[0072] First, in order to obtain a more accurate test structure, the test conditions need to be prepared. First, for the test site, the particle damper damping performance test device is preferably placed on a rigid ground or other rigid bearing. Second, during the test, there should be no vibration source or sound source around the test device that can affect the test results. Third, the test is preferably carried out under the condition of environmental temperature of 18℃-25℃, and the environmental wind speed is less than 0.5m / s.

[0073] Please refer to Figure 4Fig. 1 is a block diagram of a particle damper damping performance test method according to an embodiment of the present application.

[0074] The particle damper damping performance test method comprises the following steps:

[0075] S401, during the test, the excitation unit 30 is connected to the particle damper mounting substrate 20;

[0076] S402, the excitation unit 30 is started to send an excitation signal to excite the particle damper mounting substrate 20, and the first modal damping ratio of the particle damper mounting substrate 20 is obtained according to the acceleration signal detected by the detection unit 40. Figure 5 The vibration frequency response curve shown in Fig. 2 is obtained, and the first modal damping ratio of the particle damper mounting substrate 20 is calculated and obtained.

[0077] S403, the particle damper to be tested 60 is placed on the particle damper mounting substrate 20, and the excitation unit 30 is started to send an excitation signal to excite the particle damper mounting substrate 20; the particle damper mounting substrate 20 and the particle damper to be tested 60 are excited, and the second modal damping ratio after the particle damper to be tested 60 is placed is obtained according to the acceleration signal detected by the detection unit 40. Figure 6 The vibration frequency response curve shown in Fig. 2 is obtained, and the second modal damping ratio after the particle damper to be tested 60 is placed is calculated and obtained.

[0078] As described above, in order to further improve the test accuracy, multiple effective tests can be performed to obtain an average value:

[0079] S404, according to the modal damping ratios obtained by multiple tests, the arithmetic mean value obtained is taken as the corresponding modal damping ratio. That is, according to the first modal damping ratios obtained by multiple tests, the arithmetic mean value obtained is taken as the first modal damping ratio of the particle damper mounting substrate; according to the second modal damping ratios obtained by multiple tests, the arithmetic mean value obtained is taken as the second modal damping ratio after the particle damper to be tested is placed. In this way, when the damping performance of the particle damper 60 is evaluated, each test can be accurately and repeatedly performed under controlled conditions to obtain reliable and consistent test data.

[0080] The above test method can be realized by a control unit 50, for example but not limited to, the control unit 50 can be constructed to form a data acquisition and analysis system, which can specifically consist of a data acquisition front end, analysis software and a computer, and those skilled in the art can realize it based on the prior art, which will not be described here.

[0081] In a specific implementation, the A / D conversion resolution is not less than 24 bits, and anti-aliasing filtering and high-pass filtering should be used in the data acquisition and analysis system to eliminate the influence of aliasing and trend items.

[0082] The embodiment of the present application adopts resonance method, and under controlled environmental conditions, a single point translation excitation is performed on the particle damper 60 by the exciter, and the corresponding vibration frequency response curve is measured. By analyzing the vibration frequency response curve, the modal damping ratio of the particle damper is calculated by using the half-power bandwidth method, so as to evaluate the damping performance. Overall, the test precision requirement can be ensured.

[0083] In addition to the particle damper damping performance test method and device, the embodiment of the present application further provides a computer program product, which comprises a computer program. When the computer program is executed by a processor, the steps of the particle damper damping performance test method are realized.

[0084] Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by hardware, or by means of software and necessary general hardware platform. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product. The software product can be stored in a non-volatile storage medium (which can be a CD-ROM, a U disk, a mobile hard disk, etc.), and includes a plurality of instructions for causing a computer device (which can be a personal computer, an electronic device, or a network device, etc.) to execute the particle damper damping performance test method described in the present application.

[0085] The above is only the preferred embodiment of the present application. It should be pointed out that for those skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A device for testing the damping performance of a particle damper, characterized in that The particle damper installation base plate is used for placing a particle damper to be tested, a fixed end of the particle damper installation base plate is arranged on the fixed support, and a free end of the particle damper installation base plate is arranged away from the fixed support; The excitation unit is used for being connected with an excitation input point of the particle damper installation base plate to send an excitation signal to the particle damper installation base plate; The detection unit is used for being arranged on the particle damper installation base plate to detect acceleration changes caused by the excitation signal; The control unit is used for obtaining a first modal damping ratio of the particle damper installation base plate and a second modal damping ratio after the particle damper to be tested is placed according to a vibration frequency response curve obtained from the acceleration changes; The particle damper installation base plate is arranged on the fixed support in a vertical direction, and the excitation input point is located at the free end of the particle damper installation base plate; and an elastic pad is arranged between the fixed end of the particle damper installation base plate and the fixed support. The inherent frequency of the fixed support is greater than 1.1 times of a test frequency range of the particle damper to be tested or less than 0.9 times of the test frequency range of the particle damper to be tested.

2. The particle damper damping performance test device according to claim 1, wherein, The particle damper installation base plate is a rectangular plate, and the length and width dimensions of the particle damper installation base plate are 3 times or more of the length and width dimensions of the particle damper.

3. The particle damper damping performance test apparatus according to claim 1, wherein The excitation unit includes an exciter, an amplifier and a signal generator, an output end of the signal generator is connected with a receiving end of the exciter through the amplifier, the signal generator is used for sending a trigger signal, the trigger signal is sent to the exciter through the amplifier for amplification, and the excitation signal is sent through the exciter; and the detection unit is a vibration acceleration sensor.

4. The particle damper damping performance test apparatus according to claim 1, wherein The test method includes the following steps:

5. A test method for a particle damper performance test apparatus according to any one of claims 1 to 4, characterized by, The excitation unit is started to send an excitation signal to excite the particle damper installation base plate, a vibration frequency response curve is obtained according to an acceleration signal detected by the detection unit, and a first modal damping ratio of the particle damper installation base plate is calculated and obtained; The particle damper to be tested is placed on the particle damper installation base plate, the excitation unit is started to send an excitation signal to excite the particle damper installation base plate and the particle damper to be tested, a vibration frequency response curve is obtained according to an acceleration signal detected by the detection unit, and a second modal damping ratio after the particle damper to be tested is placed is calculated and obtained. For the rectangular particle damper installation base plate, a placement position of the particle damper to be tested on the particle damper installation base plate is determined according to a modal vibration mode:

6. The method of claim 5, wherein the method further comprises: When a first-order modal damping ratio is tested, the particle damper should be placed at (i, j) of the particle damper installation base plate; wherein a pair of edge lengths of the rectangular particle damper installation base plate is 2i, and another pair of edge lengths is 2j. When testing the second order modal damping ratio, the particle damper should be placed at the or ​ When testing the third order modal damping ratio, the particle damper should be placed at the or of the particle damper mounting substrate; When testing the fourth order modal damping ratio, the particle damper should be placed at the center of the particle damper mounting substrate or or or ​ ​ 7. The particle damper performance testing method of the particle damper performance testing apparatus according to claim 6, wherein According to the first modal damping ratio obtained by multiple tests, an arithmetic mean value obtained by calculation is taken as the first modal damping ratio of the particle damper mounting substrate; and according to the second modal damping ratio obtained by multiple tests, an arithmetic mean value obtained by calculation is taken as the second modal damping ratio after the particle damper under test is placed.

8. A computer program product comprising a computer program, characterized in that, The computer program, when executed by a processor, implements the steps of the particle damper damping performance testing method of the particle damper damping performance testing device according to any one of claims 5 to 7.

Images