A working condition superposition sweep frequency vibration impact test device and test method thereof

Abstract

The invention belongs to the technical field of vibration impact test, and discloses a working condition superimposed frequency sweeping vibration impact test device and a test method thereof, comprising a vertical longitudinal frequency sweeping test device, a transverse frequency sweeping test device, a transverse vibration impact test device, and a vertical longitudinal vibration impact test device; the vertical longitudinal frequency sweeping test device comprises an electric vibration test bench, a test tooling, an adjustment tooling, a control sensor, a monitoring sensor and a laser displacement sensor, the transverse frequency sweeping test device comprises an electric vibration test bench, a test tooling, an adjustment tooling, a control sensor, and the transverse vibration impact test device comprises an electric vibration test bench, a test tooling, a control sensor and a monitoring sensor, and the vertical longitudinal vibration impact test device comprises a vibration table, a left mounting seat, an airbag and a right mounting seat; the invention can apply two different vibration conditions to a sample through two vibration tables and corresponding tooling, better simulate actual conditions, save time and labor, and facilitate popularization and use.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration impact testing, and in particular relates to a working condition superimposed frequency sweep vibration impact testing device and a testing method thereof. Background Art

[0002] At present, when most rail transit components are subjected to vibration and impact tests, the vibration table itself is idle and can only be tested under a single vibration condition. The current vibration table cannot apply two vibration conditions to the same sample at the same time. Most of the time, when a component is subject to multiple working conditions, the vibration table is used to alternately test the sample. For a component, the overall accumulated fatigue may affect the final test conclusion, prolong the test time, and cause a waste of resources.

[0003] In the rail transit industry, most vibration test methods simulate single-axis and single-direction tests to assess the fatigue strength of test pieces. However, if a component is tested under multiple working conditions and a single alternating test is used, the overall cumulative fatigue of the component may affect the final test conclusion. The double-excitation superimposed vibration test can effectively avoid the cumulative fatigue of the test piece caused by repeated tests. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a working condition superimposed frequency sweep vibration impact test device, including a vertical longitudinal frequency sweep test device, a transverse frequency sweep test device, a transverse vibration impact test device, and a vertical longitudinal vibration impact test device. The vertical longitudinal frequency sweep test device includes an electric vibration test bench, a test tooling, an adjustment tooling, a control sensor, a monitoring sensor and a laser displacement sensor. The upper surface of the adjustment tooling is provided with evenly spaced adjustment holes. The adjustment tooling is connected to the electric vibration test bench. A workpiece is installed between the test toolings. The control sensor, the monitoring sensor and the laser displacement sensor are installed on the workpiece. The connection between the test toolings is vertically arranged between the electric vibration test bench; the transverse frequency sweep test device includes an electric vibration test bench, a test tooling, an adjustment tooling, a control sensor, a monitoring sensor and a laser displacement sensor. The upper surface of the adjustment tooling is provided with evenly spaced adjustment holes. The adjustment tooling is connected to the electric vibration test bench. A workpiece is installed between the test toolings. The control sensor, the monitoring sensor and the laser displacement sensor are installed on the workpiece. The control sensor, monitoring sensor and laser displacement sensor are installed on the workpiece, and the connection line between the test fixtures and the electric vibration test bench is in a straight line; the lateral vibration impact test device includes a test electric vibration test bench, a test fixture, a control sensor and a monitoring sensor. The test fixture is installed on the left and right sides of the electric vibration test bench, and the workpiece is installed between the test fixtures. The test fixture on the right is connected to the test electric vibration test bench; the vertical vibration impact test device includes a vibration table, a left mounting seat, an airbag and a right mounting seat. The bottom of the left mounting seat is connected to the left vibration table, and the right side of the left mounting seat is connected to the sample. An airbag is installed at the bottom of the left mounting seat, and the airbag is used to support the weight of the left mounting seat and part of the weight of the sample. The right mounting seat is installed above the right vibration table, and the left side of the right mounting seat is connected to the sample. The right mounting seat adopts a hollow design, which not only reduces its own weight but also ensures its strength in use. The right mounting seat is made of 7075 aluminum alloy so that the vibration table can be better excited.

[0005] A testing method for a working condition superposition swept frequency vibration impact test device, the steps are as follows:

[0006] 1). First, rigidly connect the adjustment fixture and the electric vibration table of the vertical sweep frequency test device. Before the test, perform a sweep frequency test on the adjustment fixture. The natural frequency of the adjustment fixture is greater than the natural frequency of the workpiece.

[0007] 2). Use the electric vibration table of the vertical and longitudinal frequency sweep test device as the exciting force to perform vertical and longitudinal frequency sweep, and install the workpiece through the test fixture;

[0008] 3). By adjusting the installation position of the test fixture in the adjustment hole, the acceleration sensor is pasted on the connection and fixing position between the workpiece and the test fixture as the control point, and the acceleration sensor is pasted on the end or middle of the workpiece as the response point. The laser displacement sensor is monitored to the test displacement position, so that the workpiece is placed in different tension and compression states for frequency sweep test, and the vertical and longitudinal first-order resonance frequencies of the coupling under five different tension and compression states are obtained, and the displacement and acceleration under the resonance frequency are collected;

[0009] 4). Use the electric vibration table of the lateral frequency sweep test device as the exciting force to perform lateral frequency sweep, and install the workpiece through the test fixture;

[0010] 5). By adjusting the installation position of the test fixture in the adjustment hole, the acceleration sensor is pasted on the connection and fixing position between the workpiece and the test fixture as the control point, and the acceleration sensor is pasted on the end or middle part of the workpiece as the response point. The laser displacement sensor is monitored to the displacement position of the test, so that the workpiece is placed in different tension and compression states for frequency sweep test, and the lateral first-order resonance frequency of the coupling under five different tension and compression states is obtained, and the displacement and acceleration under the resonance frequency are collected;

[0011] 6). Using the electric vibration table of the vertical vibration impact test device as the exciting force, the workpiece is installed through the test fixture to carry out vertical simulation long life, impact test, and functional random vibration test;

[0012] 7). The electric vibration table of the lateral vibration impact test device is used as the exciting force, and the coupling is installed through the tooling to carry out lateral simulation long life, impact test, and functional random vibration test.

[0013] Beneficial effects:

[0014] 1. The present invention can apply two different vibration conditions to the sample through two vibration tables and corresponding tooling, so as to better simulate the actual conditions, save the test cost, and is convenient and quick to install, saving time and labor, and is easy to promote and use.

[0015] 2. The present invention conducts simulation assessment on samples through double-stage excitation superimposed vibration tests. Each vibration table is extended to install the sample through a fixture. The extended section is weighed by an airbag to offset the bending moment. The electric vibration test table is used for excitation, which saves manpower and time for test adjustment and assessment, and more effectively simulates the actual vehicle working conditions for assessment and provides a reasonable and effective reference basis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the vertical longitudinal frequency sweep test device of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the lateral frequency sweep test device of the present invention;

[0018] Figure 3 It is a structural schematic diagram of the lateral vibration impact test device of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of the vertical vibration impact test device of the present invention;

[0020] Figure 5 It is the vertical simulation long life test curve of the bogie end of the present invention;

[0021] Figure 6 It is the vertical simulation long life test curve of the axle end (wheel end) of the present invention;

[0022] Figure 7 This is the longitudinal simulation long life test curve of the bogie end of the present invention;

[0023] Figure 8 This is the longitudinal simulated long life test curve of the axle end (wheel end) of the present invention;

[0024] Fig. 9 It is the bogie end vertical positive impact test curve of the present invention;

[0025] Fig.10 This is the vertical negative impact test curve of the bogie end of the present invention;

[0026] Fig.11 This is the longitudinal negative impact test curve of the bogie end of the present invention;

[0027] Fig.12 This is the longitudinal negative impact test curve of the bogie end of the present invention;

[0028] Fig.13 It is the vertical positive impact test curve of the axle end (wheel end) of the present invention;

[0029] Fig.14 It is the vertical negative impact test curve of the axle end (wheel end) of the present invention;

[0030] Fig.15 This is the longitudinal positive impact test curve of the axle end (wheel end) of the present invention;

[0031] Fig.16 This is the longitudinal negative impact test curve of the axle end (wheel end) of the present invention;

[0032] Fig.17 It is the vertical functional random vibration test curve of the bogie end of the present invention;

[0033] Fig.18 It is the vertical functional random vibration test curve of the axle end (wheel end) of the present invention;

[0034] Fig.19is the longitudinal functional random vibration test curve of the bogie end of the present invention;

[0035] Fig. 20 This is the longitudinal functional random vibration test curve of the axle end (wheel end) of the present invention;

[0036] Fig.21 This is the lateral simulation long life test curve of the bogie end of the present invention;

[0037] Fig. 22 This is the transverse simulated long life test curve of the axle end (wheel end) of the present invention;

[0038] Fig.23 This is the bogie end lateral positive impact test curve of the present invention;

[0039] Fig.24 This is the bogie end lateral negative impact test curve of the present invention;

[0040] Fig.25 This is the transverse positive impact test curve of the axle end (wheel end) of the present invention;

[0041] Fig.26 This is the lateral negative impact test curve of the axle end (wheel end) of the present invention;

[0042] Fig. 27 is the lateral functional random vibration test curve of the bogie end of the present invention;

[0043] Fig.28 This is the lateral functional random vibration test curve of the axle end (wheel end) of the present invention;

[0044] Fig.29 It is a reference diagram for the bogie end test of the present invention;

[0045] Fig.30 This is the axle end (wheel end) test reference diagram of the present invention;

[0046] Fig.31 It is the reference graph of the impact test of the present invention;

[0047] As shown in the figure: electric vibration test bench 1, test fixture 2, workpiece 3, adjustment fixture 4, adjustment hole 5, left mounting seat 6, right mounting seat 7. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] A working condition superimposed frequency sweep vibration impact test device, including a vertical longitudinal frequency sweep test device, a transverse frequency sweep test device, a transverse vibration impact test device, and a vertical longitudinal vibration impact test device. The vertical longitudinal frequency sweep test device includes an electric vibration test bench 1, a test fixture 2, an adjustment fixture 4, a control sensor, a monitoring sensor, and a laser displacement sensor. The upper surface of the adjustment fixture 4 is provided with evenly spaced adjustment holes 5. The adjustment fixture 4 is connected to the electric vibration test bench 1. A workpiece 3 is installed between the test fixtures 2. The control sensor, the monitoring sensor, and the laser displacement sensor are installed on the workpiece 3. The connection between the test fixtures 2 and the electric vibration test bench 1 is vertically arranged; the transverse frequency sweep test device includes an electric vibration test bench 1, a test fixture 2, an adjustment fixture 4, a control sensor, a monitoring sensor, and a laser displacement sensor. The upper surface of the adjustment fixture 4 is provided with evenly spaced adjustment holes 5. The adjustment fixture 4 is connected to the electric vibration test bench 1. The test fixture 2 A workpiece 3 is installed between them, a control sensor, a monitoring sensor and a laser displacement sensor are installed on the workpiece 3, and the connection line between the test fixtures 2 and the electric vibration test bench 1 is in a straight line; the lateral vibration impact test device comprises an electric vibration test bench 1, a test fixture 2, a control sensor and a monitoring sensor, the test fixture 2 is installed on the electric vibration test bench 1 on the left and right sides, a workpiece 3 is installed between the test fixtures 2, and the test fixture 2 on the right is connected to the electric vibration test bench 1; the vertical vibration impact test device comprises a vibration table, a left mounting seat 6, an airbag and a right mounting seat 7, the left mounting seat 6 is connected to the left vibration table at the bottom, the left mounting seat 6 is connected to the sample at the right, an airbag is installed at the bottom of the left mounting seat 6, the airbag is used to support the weight of the left mounting seat 6 and part of the weight of the sample, the right mounting seat 7 is installed above the right vibration table, the left side of the right mounting seat 7 is connected to the sample, the right mounting seat 7 adopts a hollow design, which not only reduces its own weight but also ensures its use strength, and the right mounting seat 7 is made of 7075 aluminum alloy so that the vibration table can be better excited.

[0050] A testing method for a working condition superposition swept frequency vibration impact test device, the steps are as follows:

[0051] 1). First, the coupling is rigidly connected to the vibration table of the vertical sweep frequency test device through the adjustment fixture 4. Before the test, a sweep frequency test is performed on the adjustment fixture 4. The natural frequency of the adjustment fixture 4 is greater than the natural frequency of the workpiece 3;

[0052] 2). Use the electric vibration table of the vertical and longitudinal frequency sweep test device as the exciting force to perform vertical and longitudinal frequency sweep, and install the coupling through the test fixture 2;

[0053] 3). The acceleration sensor is pasted on the connection and fixing part between the coupling and the test fixture 2 as the control point. The acceleration sensor is pasted on the end or middle part of the coupling as the response point. The laser displacement sensor is monitored to the displacement part of the test. The installation position of the test fixture 2 in the adjustment hole 5 is adjusted to make the coupling in different states for frequency sweep test. There are 5 vertical (longitudinal) tension and compression displacement states: 15mm, 10mm, 0mm, -10mm, -15mm; 5 lateral states: 12mm, 6mm, 0mm, -6mm, -12mm. The vertical (longitudinal) and lateral directions are swept in the frequency range of 2Hz to 350Hz to obtain the resonance frequency of the test piece in different states, obtain the vertical and longitudinal first-order resonance frequencies of the coupling under five different tension and compression states, and collect the test data of displacement and acceleration. The collected data are shown in the table below.

[0054]

[0055] 4). Use the electric vibration table of the lateral frequency sweep test device as the exciting force to perform lateral frequency sweep, and install the coupling through the test fixture 2;

[0056] 5). The acceleration sensor is pasted on the connection and fixing position between the coupling and the test fixture 2 as the control point. The acceleration sensor is pasted on the end or middle part of the coupling as the response point. The laser displacement sensor is monitored to the displacement position of the test. By adjusting the installation position of the test fixture 2 in the adjustment hole 5, the coupling is placed in different tension and compression states of 12mm, 6mm, 0mm, -6mm, and -12mm for frequency sweep test. The first-order transverse resonance frequency of the coupling under five different tension and compression states is obtained, and the displacement and acceleration under the resonance frequency are collected. The collected data are shown in the table below;

[0057]

[0058] 6). The electric vibration table of the vertical vibration impact test device is used as the exciting force. The coupling is installed through the test fixture 2 for vertical simulation of long life, impact test, and functional random vibration test. The direction is achieved by adjusting the coupling to turn 90°. The vibration test uses a total of six sensors for weighted average control, and the impact test uses single-point control. The vibration test uses two working conditions at both ends of the coupling for simultaneous excitation. The impact test impacts both ends in turn, and monitoring sensors are pasted on the test positions to observe the transmission characteristics of the coupling.

[0059] The simulated long life test of the bogie end is carried out according to the Class 2 test conditions in the IEC61373-2010 standard; the simulated long life test of the axle end (wheel end) is carried out according to the Class 3 test conditions in the IEC61373-2010 standard; the simulated long life test conditions are as follows, and the Figures 5 to 8 Test curve.

[0060] Fig.29 This is the reference spectrum for the bogie end test. When the mass is ≤100kg, f1=5Hz, f2=250Hz; when the mass is >100kg≤250kg, f1=(250 / m)×2Hz, f2=(250 / m)×100Hz; when the mass is >250kg, f1=2Hz, f2=100Hz.

[0061] Fig.30 This is the reference spectrum for the axle end (wheel end) test. When the mass is ≤50kg, f2=500Hz; when the mass is >50kg≤125kg, f2=(125 / m)×200Hz; when the mass is >125kg, f2=200Hz.

[0062]

[0063] The frequency range is determined according to the mass of the coupling. At the bogie end, since the sample mass m>250kg, the frequency range is selected as f1=2Hz, f2=100Hz, and the test time in each direction is 5h.

[0064] The frequency range is determined according to the mass of the coupling. For the axle end (wheel end), since the sample mass m>250kg, the frequency range is selected as f1=10Hz, f2=200Hz, and the test time in each direction is 5h.

[0065] The frequency range is determined according to the mass of the coupling. For the axle end (wheel end), since the sample mass m>250kg, the frequency range is selected as f1=10Hz, f2=200Hz, and the test time in each direction is 5h.

[0066] After 5 hours of vertical and longitudinal simulation of long life, the coupling was visually inspected and no mechanical damage or damage was found. Figure 5 and Figure 7 The simulated long-life test curve of the bogie end shows that the response point of the bogie end reaches attenuation at around 9Hz, which better reflects the shock-absorbing effect of the laminations.

[0067] After 5 hours of vertical and longitudinal simulation of long life, the coupling was visually inspected and no mechanical damage or damage was found. Figure 6 and Figure 8 The simulated long-life test curve of the axle end shows that the response point of the bogie end is amplified at 8Hz, but reaches an attenuation effect at around 120Hz, and the amplified point does not coincide with the resonant frequency of the sample.

[0068] The bogie end (motor end) impact test is carried out according to the 2nd type impact condition in the IEC61373-2010 standard, and the axle end (wheel end) impact test is carried out according to the 3rd type test condition in the IEC61373-2010 standard; the impact test conditions are as follows: Fig.31 Impact test reference spectrum, get Figures 9 to 16 Test curve.

[0069]

[0070] pass Figures 9 to 16 The vertical and longitudinal impact test curves, the target curves and control curves at the bogie end and wheel end of the coupling completed the test within the allowable tolerance range, and after visual inspection, the coupling showed no damage or mechanical damage.

[0071] The functional random vibration test of the bogie end (motor end) is carried out according to the Class 2 test conditions in the IEC61373-2010 standard, and the functional random vibration test of the axle end (wheel end) is carried out according to the Class 3 test conditions in the IEC61373-2010 standard; the functional random vibration test conditions are as follows, and the Figures 17 to 20 Test curve.

[0072]

[0073]

[0074] The reference spectrum and frequency range calculation of the functional random vibration test are the same as those of the simulated long life test.

[0075] pass Figures 17 to 20 The vertical and longitudinal functional random vibration test curves, the target curves and control curves at the coupling bogie end and wheel end completed the test within the allowable tolerance range and no abnormalities were found; according to the standard requirements, the functional test does not evaluate the mechanical structure of the test sample.

[0076] 7). The electric vibration table of the lateral vibration impact test device is used as the exciting force, and the coupling is installed through the tooling to carry out lateral simulation long life, impact test, and functional random vibration test.

[0077] An electric vibration table is used as the exciting force, and the coupling is installed through the tooling to carry out lateral simulation of long life, impact test, and functional random vibration test. In the lateral vibration test, the motor end is first used as the excitation end, and the wheel end is fixed. During the test, vibration is applied to the motor end and transmitted to the wheel end through the center shaft, and then the displacement generated is compensated by the laminations at both ends; the wheel end is then used as the excitation end, and the motor end is connected with a linear bearing so that it is in a free state during the vibration test; the impact test is carried out on both ends successively, and the reference spectrum and frequency range calculation are the same as the vertical and longitudinal methods; the bogie end (motor end) test is carried out according to the 2nd type of impact conditions in the IEC61373-2010 standard, and the axle end (wheel end) is carried out according to the 3rd type of test conditions in the IEC61373-2010 standard. The test conditions are as follows. Figure 21 to Figure 28 Test curve.

[0078]

[0079] After 5 hours of lateral simulated long life test, the coupling was visually inspected and no mechanical damage or damage was found. Fig.21 The simulated long-life test curve of the bogie end shows that the response point of the bogie end is amplified at 13Hz, but reaches an attenuation effect at around 20Hz, and the amplified point does not coincide with the resonance frequency of the sample.

[0080] After 5 hours of lateral simulated long life test, the coupling was visually inspected and no mechanical damage or damage was found. Fig. 22 The simulated long-life test curve at the wheel end shows that the response point at the bogie end reaches attenuation at around 20Hz, which better reflects the shock-absorbing effect of the laminations.

[0081] pass Figure 23-24 The lateral impact test curve, the target curve and the control curve of the coupling at the bogie end and the wheel end completed the test within the allowable tolerance range, and after visual inspection, the coupling showed no damage and mechanical damage.

[0082] pass Figure 21 to Figure 28 The lateral functional random vibration test curve, the target curve and the control curve at the coupling bogie end and the wheel end completed the test within the allowable tolerance range and no abnormalities were found; according to the standard requirements, the functional test does not evaluate the mechanical structure of the test sample.

[0083] This test method can more effectively simulate the actual vehicle state to test and evaluate the coupling. This method uses two electric vibration test benches 1 to perform vibration impact tests on the axle end (wheel end) and the bogie end (motor end). This test method provides a reasonable and effective reference basis for the structural and performance requirements of the coupling before installation.

[0084] When an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element, and when an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0085] The directional terms such as left, right, up, down, etc. in this embodiment are merely relative concepts or are based on the normal use state of the product and should not be considered as restrictive.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A working condition superposition swept frequency vibration impact test device, characterized in that: It includes a vertical and longitudinal frequency sweeping test device, a transverse frequency sweeping test device, a transverse vibration impact test device, and a vertical and longitudinal vibration impact test device. The vertical and longitudinal frequency sweeping test device includes an electric vibration test bench, a test fixture, an adjustment fixture, a control sensor, a monitoring sensor, and a laser displacement sensor. The adjustment fixture is connected to the electric vibration test bench, a workpiece is installed between the test fixtures, the control sensor, the monitoring sensor, and the laser displacement sensor are installed on the workpiece, and the connection between the test fixtures is vertically arranged between the electric vibration test bench; the transverse frequency sweeping test device includes an electric vibration test bench, a test fixture, an adjustment fixture, a control sensor, a monitoring sensor, and a laser displacement sensor. The adjustment fixture is connected to the electric vibration test bench, a workpiece is installed between the test fixtures, the control sensor, the monitoring sensor, and the laser displacement sensor are installed on the workpiece. The laser displacement sensor is installed on the workpiece, and the connection line between the test fixtures and the electric vibration test bench is in a straight line; the lateral vibration impact test device includes a test electric vibration test bench, a test fixture, a control sensor and a monitoring sensor, and the test fixture is installed on the electric vibration test bench on the left and right sides, and the workpiece is installed between the test fixtures, and the test fixture on the right is connected to the test electric vibration test bench; the vertical vibration impact test device includes a vibration table, a left mounting seat, an airbag and a right mounting seat, the bottom of the left mounting seat is connected to the left vibration table, the right side of the left mounting seat is connected to the sample, an airbag is installed at the bottom of the left mounting seat, and the airbag is used to support the weight of the left mounting seat and part of the weight of the sample, the right mounting seat is installed above the right vibration table, and the left side of the right mounting seat is connected to the sample.

2. The working condition superposition swept frequency vibration impact test device according to claim 1, characterized in that: The upper surface of the adjusting tool is provided with evenly spaced adjusting holes.

3. The working condition superposition swept frequency vibration impact test device according to claim 1, characterized in that: The right side mounting seat adopts a hollow design.

4. The working condition superposition swept frequency vibration impact test device according to claim 1, characterized in that: The right side mounting seat is made of 7075 aluminum alloy.

5. The testing method of a working condition superposition swept frequency vibration impact testing device according to claim 1 is characterized in that: Here are the steps: 1). First, rigidly connect the adjustment fixture and the vibration table of the vertical frequency sweep test device; 2). Use the electric vibration table of the vertical and longitudinal frequency sweep test device as the exciting force to perform vertical and longitudinal frequency sweep, and install the workpiece through the test fixture; 3). By adjusting the installation position of the test fixture in the adjustment hole, the acceleration sensor is pasted on the connection and fixing position between the workpiece and the test fixture as the control point, and the acceleration sensor is pasted on the end or middle of the workpiece as the response point. The laser displacement sensor is monitored to the test displacement position, so that the workpiece is placed in different tension and compression states for frequency sweep test, and the vertical and longitudinal first-order resonance frequencies of the coupling under five different tension and compression states are obtained, and the displacement and acceleration under the resonance frequency are collected; 4). Use the electric vibration table of the lateral frequency sweep test device as the exciting force to perform lateral frequency sweep, and install the workpiece through the test fixture; 5). By adjusting the installation position of the test fixture in the adjustment hole, the acceleration sensor is pasted on the connection and fixing position between the workpiece and the test fixture as the control point, and the acceleration sensor is pasted on the end or middle part of the workpiece as the response point. The laser displacement sensor is monitored to the displacement position of the test, so that the workpiece is placed in different tension and compression states for frequency sweep test, and the lateral first-order resonance frequency of the coupling under five different tension and compression states is obtained, and the displacement and acceleration under the resonance frequency are collected; 6). Using the electric vibration table of the vertical vibration impact test device as the exciting force, the workpiece is installed through the test fixture to carry out vertical simulation long life, impact test, and functional random vibration test; 7). The electric vibration table of the lateral vibration impact test device is used as the exciting force, and the coupling is installed through the tooling to carry out lateral simulation long life, impact test, and functional random vibration test.

Images