Method for evaluating precision of dynamic model of high-damping controller cover plate

Abstract

The invention discloses a high-damping controller cover plate dynamical model precision evaluation method which comprises the following steps: based on a frequency response test of a controller cover plate, obtaining a test dynamic bending coefficient and a test equivalent viscoelastic damping coefficient through modal frequency calculation; based on the frequency response dynamics simulation of the controller cover plate, a boundary condition which is the same as that of a frequency response test of the controller cover plate is adopted, and a simulation dynamic bending coefficient and a simulation equivalent viscoelastic damping coefficient are obtained through modal frequency calculation; and establishing an analysis and evaluation standard of the dynamical model precision, and obtaining an analysis and evaluation result based on the test dynamic bending coefficient, the test equivalent viscoelastic damping coefficient, the simulation dynamic bending coefficient and the simulation equivalent viscoelastic damping coefficient. According to the method, the precision of the kinetic model is systematically evaluated, potential error sources in the model can be effectively identified, more accurate theoretical support is provided for optimization design, potential problems can be found in advance in the design stage, and later complex experimental verification and repeated design are avoided.

Description

Technical Field

[0001] The present invention relates to the field of electric drive technology for new energy vehicles, and in particular to a method for evaluating the accuracy of a dynamics model of a high-damping controller cover. Background Art

[0002] With growing global attention to environmental protection and energy conservation, new energy vehicles (NEVs) have become a key trend in the automotive industry. With the annual increase in NEV ownership, consumers are placing higher demands on vehicle comfort and driving experience. NVH (noise, vibration, and harshness) performance has become a key factor influencing vehicle purchase decisions, especially in electric vehicles, where NVH performance is particularly prominent due to the unique nature of their drive systems.

[0003] To address this issue, automakers and researchers are continuously exploring and employing various technical approaches, one of which is the use of high-damping materials and optimized structural design to suppress vibration and noise in electric drive systems. High-damping controller covers, as key components of electric drive assemblies, can effectively reduce the system's vibration response and noise levels. Through proper design and optimization, controller covers can enhance the NVH performance of electric drive systems and improve vehicle comfort.

[0004] In the existing technology, a dynamic model of a high-damping controller cover is usually constructed for simulation analysis to predict and optimize the vibration characteristics and noise suppression effect of the cover. These simulation analyses can help designers evaluate the impact of different materials, structural forms and dimensions on the noise of the electric drive system, and then optimize the design of the controller cover. However, although current simulation technology has been widely used in the design of high-damping controller covers, in actual application, how to evaluate the accuracy of the dynamic model is still a technical problem. Only through a reasonable evaluation of the model accuracy can we ensure that the designed controller cover can achieve the expected noise suppression effect in actual use, further improve the NVH performance of electric vehicles, and meet consumers' requirements for comfort and quietness. Therefore, how to effectively evaluate the accuracy of the dynamic model of the high-damping controller cover has become a key technical challenge in the optimization of the NVH performance of the electric drive assembly. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a method that can analyze and evaluate the accuracy of the dynamic model of the high damping controller cover and provide effective support for the design of the high damping controller cover.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for evaluating the accuracy of the dynamic model of a high-damping controller cover is proposed. Based on the frequency response test of the controller cover, the experimental dynamic bending coefficient K is obtained by calculating the modal frequency. d (Sy) and experimental equivalent viscoelastic damping coefficient C d (Sy); Based on the frequency response dynamics simulation of the controller cover, the same boundary conditions as the frequency response test of the controller cover are adopted, and the simulated dynamic bending coefficient K is obtained by modal frequency calculation. d (Fz) and simulation equivalent viscoelastic damping coefficient C d (Fz); establish the analysis and evaluation standard of the dynamic model accuracy based on the experimental dynamic bending coefficient K d (Sy) and experimental equivalent viscoelastic damping coefficient C d (Sy) and simulation dynamic bending coefficient K d (Fz) and simulation equivalent viscoelastic damping coefficient C d (Fz), and obtain the analysis and evaluation results.

[0008] As an optimization, in the frequency response test of the controller cover, multiple accelerometers were arranged at intervals on the controller cover, and an excitation point was placed next to each accelerometer. A swept frequency excitation with an amplitude of (0.8-12)N, a resolution of (0.08-0.12)Hz, a frequency change rate of (1-3)s / 1Hz, and a frequency range of 0-1000Hz was applied. The vibration acceleration frequency response of all accelerometers was obtained, and the sum frequency response function was calculated:

[0009]

[0010] Among them H Sy (Sum) is the total frequency response of the test, n is the number of sensors, H Sy (x i ) is the acceleration amplitude corresponding to the test total frequency response at the peak frequency, identify the first 3 or 4 order peak frequencies of the test total frequency response function, and calculate the test dynamic bending coefficient K d (Sy).

[0011] As an optimization, for each order peak frequency point x i , the amplitude is reduced to 0.707H on the total frequency response curve of the test Sy (x i ) around the frequency point x i1 , x i2 , calculate the equivalent viscoelastic damping coefficient of the single-order test:

[0012]

[0013] According to the single-stage test equivalent viscoelastic damping coefficient, the overall test equivalent viscoelastic damping coefficient C is calculated. d (Sy).

[0014] As an optimization, when arranging multiple acceleration sensors, one acceleration sensor is set in the center of the controller cover, and four acceleration sensors are symmetrically set along the two diagonals of the controller cover with the center of the controller cover as the base point to form a sensor array layout.

[0015] As an optimization, in the frequency response dynamics simulation of the controller cover, the simulation total frequency response H is obtained. Fz (Sum), identify the peak frequency of the same order as the experimental sum frequency response function, and the acceleration amplitude H corresponding to the simulated sum frequency response at the peak frequency Fz (x i ), calculate the simulation dynamic bending coefficient K d (Fz).

[0016] As an optimization, for each order peak frequency point x i , the amplitude is reduced to 0.707H on the simulated total frequency response curve Fz (x i ) around the frequency point x i1 , x i2 , calculate the equivalent viscoelastic damping coefficient for single-order simulation:

[0017]

[0018] According to the single-order simulation equivalent viscoelastic damping coefficient, the overall simulation equivalent viscoelastic damping coefficient C is calculated. d (Fz).

[0019] As an optimization, the analytical evaluation coefficient of the kinetic model accuracy is:

[0020]

[0021] The evaluation criteria are as follows: Excellent: 0.9≤B kc Good: 0.7≤B kc <0.9; qualified: 0.6≤B kc <0.7; Poor: 0.4≤B kc <0.6; Poor: B kc <0.4.

[0022] Compared with the existing technology, the present invention has the following beneficial effects: by systematically evaluating the accuracy of the high-damping controller cover dynamic model, the present invention can effectively identify potential sources of errors in the model, thereby providing more accurate theoretical support for optimized design; by accurately evaluating the accuracy of the dynamic model, potential problems can be discovered in advance during the design stage, avoiding complex experimental verification and repeated design in the later stage, thereby effectively shortening the R&D cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the arrangement of sensors and excitation points on the cover of the high damping controller in the present invention;

[0024] Figure 2 This is the final frequency response curve of the test results of the high damping controller cover in the present invention;

[0025] Figure 3 This is the final frequency response curve of the simulation results of the high damping controller cover in the present invention;

[0026] Figure 4 The first-order modal vibration diagram of the high damping controller cover simulated in the present invention;

[0027] Figure 5 The simulated second-order modal vibration diagram of the high damping controller cover in the present invention;

[0028] Figure 6 The simulated third-order modal vibration diagram of the high damping controller cover in the present invention;

[0029] Figure 7 This is the simulated fourth-order modal vibration diagram of the high-damping controller cover in the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] The evaluation method for the accuracy of the high-damping controller cover dynamic model in this specific embodiment is based on the frequency response test of the controller cover. An acceleration sensor is set at the center of the controller cover, and four acceleration sensors are symmetrically set along the two diagonals of the controller cover with the center of the controller cover as the base point to form a sensor array layout. An excitation point is arranged next to each acceleration sensor, such as Figure 1 As shown in the figure, the circle is the sensor installation point, the triangle point is the excitation point, and a sweep frequency excitation with an amplitude of 1N, a resolution of 0.1Hz, a frequency change rate of 1s / 1Hz, and a frequency range of 0~1000Hz is applied.

[0032] Calculate the dynamic bending coefficient K through the modal frequency test d (Sy) and experimental equivalent viscoelastic damping coefficient C d (Sy):

[0033] Get the vibration acceleration frequency response of all accelerometers and calculate the total frequency response function:

[0034]

[0035] Among them H Sy (Sum) is the total frequency response of the test, n is the number of sensors, H Sy (x i ) is the acceleration amplitude of the corresponding test sum frequency response at the peak frequency, and x is defined i is the peak point of the frequency response function, then H Sy (x i )=0 is the extreme point, at x i There is H on the left side Sy (x i )>0 is an increasing function, at x i There is H on the right side Sy (x i )<0 is a decreasing function. The first four peak frequencies of the total frequency response function of the identification test are 126Hz, 381Hz, 584Hz, and 874Hz respectively. Figure 2 As shown, the experimental dynamic bending coefficient K is calculated d (Sy).

[0036]

[0037] Where K1(Sy) represents the first-order modal frequency of the controller, K2(Sy) represents the second-order modal frequency of the controller, K3(Sy) represents the third-order modal frequency of the controller, and K4(Sy) represents the fourth-order modal frequency of the controller. The bending coefficient of the controller cover based on the test results is calculated to be 5.77.

[0038] Each order peak frequency point x i The corresponding acceleration amplitudes are: 3.4g / N, 2.51g / N, 2.29g / N, 4.58g / N, and the amplitude is reduced to 0.707H on the total frequency response curve of the test. Sy (x i ) around the frequency point x i1 , x i2 , calculate the equivalent viscoelastic damping coefficient of the single-order test:

[0039]

[0040] The calculated damping coefficients of the first four peak frequency points are 0.041, 0.088, 0.09, and 0.071, respectively, and the overall test equivalent viscoelastic damping coefficient C is then calculated. d (Sy):

[0041]

[0042] In the formula, C1(Sy) represents the equivalent viscoelastic damping coefficient corresponding to the first-order mode of the controller cover, C2(Sy) represents the equivalent viscoelastic damping coefficient corresponding to the second-order mode of the controller cover, C3(Sy) represents the equivalent viscoelastic damping coefficient corresponding to the third-order mode of the controller cover, and C4(Sy) represents the equivalent viscoelastic damping coefficient corresponding to the fourth-order mode of the controller cover. The equivalent viscoelastic damping coefficient of the overall test is calculated to be 0.077.

[0043] The same boundary conditions as the frequency response test of the device cover are adopted to simulate the dynamic bending coefficient K through modal frequency calculation. d (Fz) and simulation equivalent viscoelastic damping coefficient C d (Fz):

[0044] Perform frequency response simulation of the high damping controller cover and obtain the total frequency response curve based on the dynamic simulation results, such as Figure 3 As shown, the peak frequencies of the first four order simulation frequency response functions are obtained, the first order peak modal frequency x1, the second order peak modal frequency x2, the third order peak modal frequency x3, the fourth order peak modal frequency x4, and the acceleration amplitude H corresponding to the simulation sum frequency response at the peak frequency. Fz (x i ). The modal vibration diagram of the high damping controller cover is shown in Figures 4 to 7 As shown. The first four modal frequencies calculated are: 120Hz, 384Hz, 595Hz, 894Hz, and the simulated dynamic bending coefficient K is calculated. d (Fz):

[0045]

[0046] Where K1(Fz) represents the first-order modal frequency of the controller, K2(Fz) represents the second-order modal frequency of the controller, K3(Fz) represents the third-order modal frequency of the controller, and K4(Fz) represents the fourth-order modal frequency of the controller. The bending coefficient of the controller cover based on the simulation results is calculated to be 5.73.

[0047] Each order peak frequency point x i The corresponding acceleration amplitudes are: 3.36g / N, 2.56g / N, 2.24g / N, 4.08g / N, and the amplitude is reduced to 0.707H on the simulated total frequency response curve. Fz (x i) around the frequency point x i1 , x i2 , the calculated damping coefficients of the first four peak frequency points are: 0.049, 0.052, 0.056, 0.093, and then the overall simulation equivalent viscoelastic damping coefficient is calculated:

[0048]

[0049] In the formula, C1(Fz) represents the equivalent damping coefficient corresponding to the first-order mode of the controller cover, C2(Fz) represents the equivalent damping coefficient corresponding to the second-order mode of the controller cover, C3(Fz) represents the equivalent damping coefficient corresponding to the third-order mode of the controller cover, and C4(Fz) represents the equivalent damping coefficient corresponding to the fourth-order mode of the controller cover. The overall simulation equivalent viscoelastic damping coefficient is calculated to be 0.056.

[0050] The analytical evaluation coefficient of the dynamic model accuracy is:

[0051]

[0052] Specific B kc =1-(0.5*0.0068+0.5*0.2727)=0.8603, according to the evaluation criteria: Excellent: 0.9≤B kc Good: 0.7≤B kc <0.9; qualified: 0.6≤B kc <0.7; Poor: 0.4≤B kc <0.6; Poor: B kc <0.4, the accuracy of the dynamic model of the high damping controller cover is evaluated as: good.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present invention that do not depart from the purpose and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for evaluating the accuracy of a high-damping controller cover dynamics model, characterized by: Based on the frequency response test of the controller cover, the dynamic bending coefficient K of the test is obtained by modal frequency calculation d (Sy) and experimental equivalent viscoelastic damping coefficient C d (Sy); Based on the frequency response dynamics simulation of the controller cover, the same boundary conditions as the frequency response test of the controller cover are adopted, and the simulated dynamic bending coefficient K is obtained by modal frequency calculation. d (Fz) and simulation equivalent viscoelastic damping coefficient C d (Fz); establish the analysis and evaluation standard of the dynamic model accuracy based on the experimental dynamic bending coefficient K d (Sy) and experimental equivalent viscoelastic damping coefficient C d (Sy) and simulation dynamic bending coefficient K d (Fz) and simulation equivalent viscoelastic damping coefficient C d (Fz), and obtain the analysis and evaluation results.

2. The method for evaluating the accuracy of the high damping controller cover dynamic model according to claim 1, characterized in that: In the frequency response test of the controller cover, multiple accelerometers are arranged at intervals on the controller cover, and an excitation point is placed next to each accelerometer. A swept frequency excitation with an amplitude of (0.8-12)N, a resolution of (0.08-0.12)Hz, a frequency change rate of (1-3)s / 1Hz, and a frequency range of 0-1000Hz is applied. The vibration acceleration frequency response of all accelerometers is obtained, and the sum frequency response function is calculated: Among them, H Sy (Sum) is the total frequency response of the test, n is the number of sensors, H Sy (x i ) is the acceleration amplitude corresponding to the test total frequency response at the peak frequency, identify the first 3 or 4 order peak frequencies of the test total frequency response function, and calculate the test dynamic bending coefficient K d (Sy).

3. The method for evaluating the accuracy of the high damping controller cover dynamic model according to claim 2, characterized in that: For each order peak frequency point x i , the amplitude is reduced to 0.707H on the total frequency response curve of the test Sy (x i ) around the frequency point x i1 , x i2 , calculate the equivalent viscoelastic damping coefficient of the single-order test: According to the single-stage test equivalent viscoelastic damping coefficient, the overall test equivalent viscoelastic damping coefficient C is calculated. d (Sy).

4. The method for evaluating the accuracy of the high damping controller cover dynamic model according to claim 2, characterized in that: When arranging multiple acceleration sensors, one acceleration sensor is set at the center of the controller cover, and four acceleration sensors are symmetrically set along the two diagonals of the controller cover with the center of the controller cover as the base point to form a sensor array layout.

5. The method for evaluating the accuracy of the high damping controller cover dynamic model according to claim 2, characterized in that: In the frequency response dynamics simulation of the controller cover, obtain the simulation total frequency response H Fz (Sum), identify the peak frequency of the same order as the experimental sum frequency response function, and the acceleration amplitude H corresponding to the simulated sum frequency response at the peak frequency Fz (x i ), calculate the simulation dynamic bending coefficient K d (Fz).

6. The method for evaluating the accuracy of the high damping controller cover dynamic model according to claim 5, characterized in that: For each order peak frequency point x i , the amplitude is reduced to 0.707H on the simulated total frequency response curve Fz (x i ) around the frequency point x i1 , x i2 , calculate the equivalent viscoelastic damping coefficient for single-order simulation: According to the single-order simulation equivalent viscoelastic damping coefficient, the overall simulation equivalent viscoelastic damping coefficient C is calculated. d (Fz).

7. The method for evaluating the accuracy of the high damping controller cover dynamic model according to claim 1, characterized in that: The analytical evaluation coefficient of the dynamic model accuracy is: The evaluation criteria are as follows: Excellent: 0.9≤B kc Good: 0.7≤B kc <0.9; qualified: 0.6≤B kc <0.7; Poor: 0.4≤B kc <0.6; Poor: B kc <0.4.

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