Device for testing damping performance of particle damper

Abstract

The utility model discloses a damping performance testing device for a particle damper, which is characterized in that a fixed end of a particle damper mounting substrate of the testing device is arranged on a fixed bracket, and a free end of the particle damper mounting substrate is arranged far away from the fixed bracket; an excitation unit is used for being connected with an excitation input point of a particle damper mounting substrate so as to send an excitation signal to the particle damper mounting substrate; a detection unit is arranged on a particle damper mounting substrate and is used for detecting acceleration change generated by an excitation signal; the control unit is used for obtaining a first modal damping ratio of the particle damper mounting substrate and a second modal damping ratio after the particle damper to be tested is placed according to a vibration frequency response curve obtained by the acceleration change. By applying the scheme, the first modal damping ratio and the second modal damping ratio are compared, so that the test precision can be effectively improved, and a good technical guarantee is provided for evaluating the damping performance of the particle damper.

Description

Technical Field

[0001] The utility model relates to the technical field of particle damper tests, and particularly relates to a device for testing the damping performance of a particle damper. Background Art

[0002] Particle dampers are effectively applied in different vibration reduction and energy absorption application scenarios, such as, but not limited to, particle dampers applicable to a bearing system. In practical applications, the damping performance of a particle damper is an important indicator that accurately reflects its ability to absorb vibration noise and impact energy. Precise acquisition of the damping performance of a particle damper can provide a scientific basis for the design and evolution of the damper.

[0003] In view of this, it is urgent to optimize the damping performance test scheme for particle dampers to meet the usage requirements of different application scenarios. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a device for testing the damping performance of a particle damper, so as to effectively improve the test accuracy and provide good technical guarantee for evaluating the damping performance of the particle damper.

[0005] The utility model provides a device for testing the damping performance of a particle damper, which includes a fixed bracket, a particle damper installation substrate, an excitation unit, a detection unit and a control unit; the particle damper installation substrate is used for placing the particle damper to be tested, the fixed end of the particle damper installation substrate is arranged on the fixed bracket, and the free end of the particle damper installation substrate is arranged away from the fixed bracket; the excitation unit is used to connect with the excitation input point of the particle damper installation substrate to send an excitation signal to the particle damper installation substrate; the detection unit is used to be arranged on the particle damper installation substrate and detect the acceleration change generated by the excitation signal; the control unit is used to obtain the first modal damping ratio of the particle damper installation substrate according to the vibration frequency response curve obtained from the acceleration change, and the second modal damping ratio after placing the particle damper to be tested.

[0006] Optionally, the particle damper installation substrate is arranged on the fixed bracket in the vertical direction, and the excitation input point is located at the free end of the particle damper installation substrate.

[0007] Optionally, an elastic pad is arranged between the fixed end of the particle damper installation substrate and the fixed bracket.

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

[0009] Optionally, the natural frequency of the fixed bracket is less than 0.9 times the test frequency range of the particle damper to be tested.

[0010] Optionally, the particle damper mounting substrate is a rectangular plate, and the length and width dimensions of the particle damper mounting substrate are 3 times or more of the length and width dimensions of the particle damper respectively.

[0011] Optionally, the excitation unit includes 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, which is amplified by the amplifier and then transmitted to the exciter, and the excitation signal is sent out through the exciter.

[0012] Optionally, the detection unit is a vibration acceleration sensor.

[0013] 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:

[0014] When testing the first-order modal damping ratio, the particle damper should be placed at the (i, j) position of the particle damper mounting substrate;

[0015] When testing the second-order modal damping ratio, the particle damper should be placed at the position;

[0016] When testing the third-order modal damping ratio, the particle damper should be placed at the position;

[0017] When testing the fourth-order modal damping ratio, the particle damper should be placed at the position;

[0018] Among them, one pair of side lengths of the rectangular particle damper mounting substrate is 2i, and the other pair of side lengths is 2j.

[0019] Compared with the prior art, this solution provides a particle damper damping performance testing device using the resonance method by taking a different approach. Specifically, under controlled environmental conditions, a single-point translational excitation is applied to the particle damper through an exciter, and its 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 placing the particle damper to be tested, the damping performance of the particle damper is accurately evaluated. Overall, the test accuracy requirements can be guaranteed. Description of the Drawings

[0020] Figure 1Schematic structural diagram of a particle damper damping performance testing device provided by an embodiment of the present application;

[0021] Figure 2 Schematic structural diagram of another particle damper damping performance testing device provided by an embodiment of the present application;

[0022] Figure 3 Schematic diagram of the placement coordinate system of the rectangular particle damper mounting substrate provided by an embodiment of the present application;

[0023] Figure 4 Block diagram of a particle damper damping performance testing method provided by an embodiment of the present application;

[0024] Figure 5 Vibration frequency response curve obtained by exciting the particle damper mounting substrate in an embodiment of the present application;

[0025] Figure 6 Vibration frequency response curve obtained by exciting the particle damper mounting substrate and the particle damper to be tested in an embodiment of the present application.

[0026] In the figure:

[0027] Fixed bracket 10, particle damper mounting substrate 20, excitation unit 30, exciter 31, amplifier 32, signal generator 33, detection unit 40, control unit 50, particle damper 60, elastic pad 70. Detailed implementation manners

[0028] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] A particle damper, as a device for vibration reduction and absorption of vibration or impact energy, is usually composed of a container filled with particulate matter (i.e., damping particles). Accurately obtaining the damping performance of the particle damper can accurately reflect its ability to absorb vibration noise and impact energy in actual applications, and can provide a scientific basis for the design and improvement of the damper.

[0030] Based on this, an embodiment of the present application provides a particle damper damping performance testing device. Please refer to Figure 1 , this figure is a schematic structural diagram of a particle damper damping performance testing device provided by an embodiment of the present application.

[0031] As Figure 1 shown, the particle damper damping performance testing device includes a fixed bracket 10, a particle damper mounting substrate 20, an excitation unit 30, a detection unit 40, and a control unit 50.

[0032] Among them, the fixed bracket 10 serves as a basic load-bearing and fixing structure, mainly used for installing the particle damper installation substrate 20. One end of the particle damper installation substrate 20 is fixed to the fixed bracket 10, that is, the fixed end; the other end of the particle damper installation substrate 20 is far from the fixed bracket, that is, the free end.

[0033] To avoid abnormal vibration, the fixed bracket 10 is greater than 1.1 times the test frequency range of the particle damper to be measured, or less than 0.9 times the test frequency range of the particle damper to be measured. On the basis of avoiding abnormal vibration, the stability and safety can be further improved.

[0034] To further enhance the stability of the test system, an elastic pad can be provided between the particle damper installation substrate 20 and the fixed bracket 10. Please refer to Figure 2 , this figure is a schematic structural diagram of another particle damper damping performance test device provided by the embodiment of the present application. To clearly show the differences and connections between this implementation scheme and Figure 1 the described scheme, the components or structures with the same function are schematically represented by the same marks in the figure.

[0035] As Figure 2 shown, an elastic pad 70 is provided between the fixed end of the particle damper installation substrate 20 of the particle damper damping performance test device and the fixed bracket 10, such as but not limited to a rubber pad. The connection between the fixed bracket 10 and the particle damper installation substrate 20 is realized through the elastic pad 70. On the one hand, the stability of the system can be increased; on the other hand, based on the setting of the elastic pad 70, the vibration of the particle damper installation substrate 20 can also be prevented from being affected by excessive connection.

[0036] In a specific implementation, the particle damper installation substrate 20 can be vertically installed on the fixed bracket 10 for installing the particle damper 60 to be measured. In other words, as Figure 1 shown, the upper end of the particle damper installation substrate 20 is the fixed end, the lower end is the free end, and the particle damper 60 is installed at the central position in the vertical direction of the particle damper installation substrate 20, thus constituting a test system.

[0037] In other possible implementation manners, the particle damper installation substrate 20 can also be placed horizontally. Relatively speaking, when the particle damper installation substrate 20 is vertically installed on the fixed bracket 10, the possible influence on the test accuracy in the cantilever state of the particle damper installation substrate 20 can be reduced.

[0038] Furthermore, to give full play to the role of the particle damper 60, the size of the particle damper installation substrate 20 is larger than the installation size of the particle damper 60. For the particle damper installation substrate 20, it can be a rectangular substrate or a substrate of other shapes.

[0039] 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 respectively. Preferably, the length of the particle damper mounting substrate 20 is about 3.5 to 4.5 times the long side of the particle damper, and the width of the particle damper mounting substrate 20 is about 3 to 4 times the short side of the particle damper.

[0040] For the rectangular particle damper mounting substrate 20, the placement position of the particle damper 60 to be measured on the particle damper mounting substrate 20 can be determined according to the modal vibration mode. Please refer to Figure 3 together, which is a schematic diagram of the placement coordinate system of the rectangular particle damper mounting substrate. Figure 3 In the rectangular particle damper mounting substrate 20 shown in

[0041] one pair of side lengths is 2i and the other pair of side lengths is 2j. The placement coordinate system of the particle damper takes the lower left corner of the particle damper mounting substrate 20 shown in the figure as the coordinate origin o, the direction with side length 2i as the abscissa x, and the direction with side length 2j as the ordinate y.

[0042] When testing the first-order modal damping ratio, the particle damper should be placed at (i, j) of the particle damper mounting substrate;

[0043] When testing the second-order modal damping ratio, the particle damper should be placed at of the particle damper mounting substrate;

[0044] When testing the third-order modal damping ratio, the particle damper should be placed at of the particle damper mounting substrate;

[0045] When testing the fourth-order modal damping ratio, the particle damper should be placed at of the particle damper mounting substrate.

[0046] Among them, the excitation unit 30 provides a vibration excitation effect. During the test, excitation is performed through the excitation unit 30 to obtain the vibration frequency response curve of the particle damper mounting substrate 20. 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 emits an excitation signal to excite the particle damper mounting substrate 20.

[0047] Preferably, the exciter 31 can adopt an exciter that meets the requirements in GB / T 11349.2. In practical applications, after the exciter 31 is connected to the particle damper mounting substrate 20, it does not generate additional mass and additional stiffness to the test piece (the particle damper mounting substrate 20 and the particle damper 60).

[0048] Specifically, in the vibration test system, the exciter 31 generates a sine wave vibration signal with a certain frequency and amplitude, and this signal is transmitted to the particle damper mounting substrate 20, thereby causing it to generate 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.

[0049] Among them, 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 excitation occurs, the object will suddenly be affected by the acceleration change. Taking the piezoelectric vibration acceleration sensor as an example, the sensor arranged on the particle damper mounting substrate 20 will sense this acceleration change and generate a corresponding charge signal, and the charge signal generated by the electrode pair is collected and measured. On this basis, according to the change of the charge signal, it is recorded and analyzed in a timely manner. According to the acceleration signal obtained by this detection, the vibration frequency response curve of the particle damper 60 can be obtained through frequency domain analysis or auto-spectrum analysis.

[0050] Specifically, the detection unit 40 can be formed by integrating a piezoelectric vibration acceleration sensor and a charge amplifier based on ICP (Integrated Circuit Piezoelectric) technology. In this way, it provides high-gain and low-noise signal amplification, and can convert the weak charge signal of the piezoelectric acceleration sensor into a reliable voltage signal output. In a specific implementation, the vibration acceleration sensor (40) can be implemented according to the existing technology, which will not be elaborated here.

[0051] 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 to 5000Hz to meet the requirements of different test scenarios. It has good adaptability.

[0052] Other exemplarily, the mass of the vibration acceleration sensor can be no more than 7g (grams). In this way, while reliably realizing the acceleration signal detection function, it avoids the heavier sensor from affecting the detection accuracy.

[0053] Based on the detection unit 40, the acceleration change of the particle damper installation substrate 20 after being excited can be measured, and the modal damping ratio ζ can be calculated according to the following formula (1):

[0054]

[0055] In formula (1):

[0056] ζ -- Modal damping ratio;

[0057] f 1 、f 2 -- Are the frequency values at the half-power points of the structural vibration frequency response curve; here, for the first modal damping ratio of the particle damper installation substrate 20, the structure is the particle damper installation substrate 20; for the second modal damping ratio after placing the particle damper to be tested, the structure is the particle damper installation substrate 20 and the particle damper 60 to be tested;

[0058] f 0 -- Is the natural frequency of the structure.

[0059] To improve the test accuracy, the arithmetic mean of the modal damping ratios of the particle damper obtained by further calculation through formula (2) can be used

[0060]

[0061] In formula (2):

[0062] -- Is the arithmetic mean of the modal damping ratios;

[0063] ζ i -- Is the modal damping ratio calculated through formula (1).

[0064] It should be understood that the arithmetic means of the first modal damping ratio and the second modal damping ratio can both be obtained based on formula (2).

[0065] The "modal damping ratio" here refers to the ratio of the actual damping of the structure to the critical damping. "Critical damping" is the minimum amount of damping required for the system to return to the stationary state without oscillating after being excited. It can be understood that the critical damping is equivalent to the most ideal state of the system. If the actual damping of the system is less than the critical damping, underdamping will occur 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, overdamping will occur and the system will slowly return to the equilibrium position without oscillation but with a relatively slow speed.

[0066] It should be understood that in the above formula (2), taking 5 tests as an example, the modal damping ratios obtained by calculation are averaged. In actual applications, it is not limited to 5 valid tests. The actual number of tests can be determined according to needs, and the embodiments of the present application do not make limitations.

[0067] Based on the above particle damper damping performance test device, the embodiments of the present application further provide a particle damper damping performance test method.

[0068] First, in order to obtain a more accurate test structure, test condition preparation is required. First, for the test site, it is preferred to select a rigid ground or other rigid carriers to reliably place the particle damper damping performance test device. Second, during the test, there should be no vibration sources or sound sources around the test device that affect the test results. Third, the test is preferably carried out under environmental temperature conditions of 18°C to 25°C, and the environmental wind speed is less than 0.5 m / s.

[0069] Please refer to Figure 4 This figure is a block diagram of a particle damper damping performance test method provided by the embodiments of the present application.

[0070] The particle damper damping performance test method includes the following steps:

[0071] S401, during the test, first connect the excitation unit 30 to the particle damper mounting substrate 20;

[0072] S402, start the excitation unit 30 to send out an excitation signal to excite the particle damper mounting substrate 20, and obtain the Figure 5 shown vibration frequency response curve according to the acceleration signal detected by the detection unit 40, and calculate the first modal damping ratio of the particle damper mounting substrate 20;

[0073] S403, place the particle damper 60 to be tested on the particle damper mounting substrate 20, start the excitation unit 30 to send out an excitation signal to excite the particle damper mounting substrate 20; excite the particle damper mounting substrate 20 and the particle damper 60 to be tested, and obtain the Figure 6 shown vibration frequency response curve according to the acceleration signal detected by the detection unit 40, and calculate the second modal damping ratio after placing the particle damper 60 to be tested.

[0074] As mentioned above, in order to further improve the test accuracy, multiple valid tests can be carried out and averaged:

[0075] S404. Calculate the arithmetic mean obtained from multiple tests as the corresponding modal damping ratio. That is, calculate the arithmetic mean obtained from multiple tests of the first modal damping ratio as the first modal damping ratio of the particle damper mounting substrate; calculate the arithmetic mean obtained from multiple tests of the second modal damping ratio as the second modal damping ratio after placing the particle damper to be tested. In this way, it can be ensured that when evaluating the damping performance of the particle damper 60, each test can be accurately and repeatedly executed under controlled conditions, in order to obtain reliable and consistent test data.

[0076] The above test method can be implemented by the 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 be composed of a data acquisition front end, analysis software, and a computer. Those skilled in the art can implement it based on the prior art and will not be elaborated here.

[0077] 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 terms.

[0078] The embodiment of the present application adopts the resonance method. Under controlled environmental conditions, a single-point translational excitation is applied to the particle damper 60 through an exciter to measure the corresponding vibration frequency response curve. By analyzing the vibration frequency response curve, the modal damping ratio of the particle damper is calculated using the half-power bandwidth method, thereby evaluating its damping performance. Overall, the test accuracy requirements can be guaranteed.

[0079] In addition to the foregoing particle damper damping performance test method and device, the embodiment of the present application also provides a computer program product, including a computer program, which when executed by a processor, implements the steps of the particle damper damping performance test method as described above.

[0080] 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 plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including several instructions for causing a computer device (which can be a personal computer, electronic device, or network device, etc.) to execute the particle damper damping performance test method described in the present application.

[0081] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A particle damper damping performance test device, characterized in that: It includes a fixing bracket, a particle damper mounting base plate, an excitation unit, a detection unit and a control unit; The particle damper mounting substrate is used to place the particle damper to be tested, the fixed end of the particle damper mounting substrate is arranged on the fixed bracket, and the free end of the particle damper mounting substrate is arranged away from the fixed bracket; The excitation unit is used to connect 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 used to be arranged on the particle damper mounting substrate and is used to detect the acceleration change generated 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 the particle damper to be measured is placed according to the vibration frequency response curve obtained by the acceleration change.

2. The particle damper damping performance testing device according to claim 1, characterized in that: The particle damper mounting substrate is arranged on the fixing bracket along a vertical direction, and the excitation input point is located at a free end of the particle damper mounting substrate.

3. The particle damper damping performance testing device according to claim 1, characterized in that: An elastic pad is arranged between the fixed end of the particle damper mounting substrate and the fixed bracket.

4. The particle damper damping performance testing device according to any one of claims 1 to 3, characterized in that: The natural frequency of the fixed bracket is greater than 1.1 times the test frequency range of the particle damper to be tested.

5. The particle damper damping performance testing device according to any one of claims 1 to 3, characterized in that: The natural frequency of the fixed bracket is less than 0.9 times the test frequency range of the particle damper to be tested.

6. The particle damper damping performance testing device according to any one of claims 1 to 3, characterized in that: The particle damper mounting substrate is a rectangular plate, and the length and width of the particle damper mounting substrate are respectively 3 times or more of the length and width of the particle damper.

7. The particle damper damping performance testing device according to any one of claims 1 to 3, characterized in that: The excitation unit includes 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, which is amplified by the amplifier and then transmitted to the exciter, and the excitation signal is emitted by the exciter.

8. The particle damper damping performance testing device according to any one of claims 1 to 3, characterized in that: The detection unit is a vibration acceleration sensor.

9. The particle damper damping performance testing device according to any one of claims 1 to 3, characterized in that: 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 shape: When testing the first-order modal damping ratio, the particle damper should be placed at (i, j) on the particle damper mounting substrate; When testing the second-order modal damping ratio, the particle damper should be placed on the particle damper mounting base. or Department; When testing the third-order modal damping ratio, the particle damper should be placed on the particle damper mounting base. or Department; When testing the fourth-order modal damping ratio, the particle damper should be placed on the particle damper mounting base. or or or Department; Wherein, a pair of sides of the rectangular particle damper mounting substrate has a length of 2i, and another pair of sides has a length of 2j.

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