New energy automobile electric drive and suspension support NVH frequency avoiding test device and method

Abstract

The invention relates to a new energy automobile electric drive and suspension support NVH frequency avoiding test device and method. The testing device comprises an electric drive, a half shaft, an actuator, a rotating hub, a suspension connecting tool, a modal tester, a three-way sensor, a force hammer, a signal line, a laboratory base and a suspension. The test method comprises the following steps of: 1, performing modal simulation and confirming a corresponding test working condition; 2, selecting a loading device; 3, manufacturing a suspension connecting tool; 4, debugging the test equipment; 5, determining modal weak parts of the shell and the suspension bracket of the electric drive; 6, building a test bed; 7, pasting a three-way sensor; 8, knocking the test part; 9, reading test data; and 10, completing the test, and outputting a test report. According to the invention, rack testing is directly carried out, assembling of a trial-manufactured vehicle is not needed to carry out NVH modal testing, the test period and cost are saved, different working condition forces and rotating speeds can be input into loading equipment, different operation working conditions of a real vehicle can be simulated, and multiple experiment results can be tested.

Description

Technical Field

[0001] The present invention belongs to the field of automobile technology, and in particular to a NVH frequency avoidance testing device and method for electric drive and suspension bracket of a new energy vehicle. Background Art

[0002] At present, the frequency avoidance method for electric drive assembly, housing and suspension bracket for new energy vehicles is as follows: 1. Through industry benchmarking and historical development experience summary, NVH targets are set for electric drive assembly, housing and suspension bracket respectively, and CAE simulation is carried out in the development and design stage; 2. After the physical samples are produced, bench tests are carried out separately to test the sample modes, and the measured values ​​are compared with the target values ​​for evaluation; 3. After the actual vehicle is completed, NVH vibration and noise tests are carried out on the whole vehicle. The problems faced by this method are as follows: 1. Conducting bench modal tests separately is inconsistent with actual use. On the actual vehicle, the electric drive and suspension bracket are rigidly connected and work together as a whole. Conducting bench tests separately will result in high distortion and insufficient verification. 2. When conducting bench tests separately, the electric drive or suspension bracket is fixed to the ground with tooling, and the constraints are idealized. The test results also tend to be idealized, which is better than the results in the actual working process and has low practical guidance significance. 3. Conducting bench modal tests separately only applies a fixed excitation to the electric drive or suspension bracket in a static state. The actual vehicle state is complex and changeable, and the verification results are too single, so their practical guidance significance is low. 4. In order to ensure that the modal of components meets the needs of the actual vehicle, the suspension bracket structure is usually designed redundantly, which wastes costs. Summary of the invention

[0003] The present invention proposes an NVH frequency avoidance test device and method for electric drive and suspension bracket of new energy vehicles, which can directly carry out bench testing without assembling a trial vehicle for NVH modal testing, thus saving test cycle and cost. Different working conditions forces and rotation speeds can be input into the loading equipment to simulate different operating conditions of the actual vehicle and test a variety of experimental results.

[0004] The technical solution of the present invention is described as follows in conjunction with the accompanying drawings:

[0005] In the first aspect, an embodiment of the present invention provides a new energy vehicle electric drive and suspension bracket NVH frequency avoidance test device, including an electric drive 1, a half shaft 2, an actuator 3, a rotating hub 4, a suspension connection tool 5, a modal tester 6, a three-way sensor 7, a force hammer 8, a signal line 9, a laboratory base 10 and a suspension 11;

[0006] The actuator 3 and the rotating hub 4 are placed on a laboratory base 10;

[0007] The suspension connection tool 5 is fixed on the actuator 3;

[0008] One end of the active end bracket of the suspension 11 is connected to the actuator 3, and the other end is connected to the electric drive housing of the electric drive 1; one end of the half shaft 2 is connected to the hub 4, and the other end is connected to the electric drive 1; the shell and the modal weak parts of the suspension are attached to the three-way sensor 7, and the modal weak parts are the planes or arm positions far away from the fastening points, with large vibration and low mode; the three-way sensor 7 is connected to the suspension 11; the modal tester 6 is connected to the suspension 11 and the electric drive 1 through the signal line 9; the force hammer 8 is connected to the modal tester 6.

[0009] Furthermore, the suspension connection fixture 5 is connected to the actuator 3 via bolts.

[0010] Furthermore, one end of the active end bracket of the suspension 11 is connected to the actuator 3 through bolts, and the other end is connected to the electric drive housing of the electric drive 1 through bolts.

[0011] In a second aspect, an embodiment of the present invention further provides a test method for a new energy vehicle electric drive and suspension bracket NVH frequency avoidance test device, comprising:

[0012] Step 1: Perform modal simulation and confirm the corresponding test conditions;

[0013] Step 2: Select the loading device;

[0014] Step 3: Making a suspension connection tool 5;

[0015] Step 4: Debug the test equipment;

[0016] Step 5: confirm the modal weak parts of the housing of the electric drive 1 and the bracket of the suspension 11;

[0017] Step 6: Build a test bench 6;

[0018] Step 7: Paste the three-way sensor 7;

[0019] Step 8: tap the test component;

[0020] Step nine, read the test data;

[0021] Step 10: Complete the test and output the test report.

[0022] Furthermore, the specific method of step one is as follows:

[0023] The digital models of the electric drive housing and suspension bracket are placed in the simulation software for modal analysis and calculation, multi-order modes are output, and the corresponding working conditions, speeds and loads are selected.

[0024] Furthermore, the specific method of step 2 is as follows:

[0025] According to the parameters of the electric drive 1, suspension 11, working conditions, speed and load, select the appropriate actuator 3 and hub 4. The selected equipment should be easy to operate and install and disassemble, and the selected equipment should also be able to meet the tested working conditions.

[0026] Furthermore, the specific method of step five is as follows:

[0027] Through the analysis in step 1, it is found that the locations with large amplitudes of the electric drive housing and the suspension bracket are modal weak locations.

[0028] Furthermore, the specific method of step six is ​​as follows:

[0029] Build a test bench, connect the electric drive 11, the suspension bracket, and the half-axle 2 together; adjust the position of the actuator 3, and connect the suspension bracket and the actuator 3 together; adjust the position of the hub 4, and connect the half-axle 2 and the hub 4 together.

[0030] Furthermore, the specific method of step eight is as follows:

[0031] The force hammer 8 is connected to the modal tester 6, and the force hammer 8 is held and used to strike; the hammering should be regular, requiring the same point and the same direction to be struck with equal force.

[0032] Furthermore, the specific method of step nine is as follows:

[0033] The modal tester 6 is used to read the modes of the weak modal parts, analyze whether the shell and suspension modes and structures meet the design requirements, and analyze the optimization plan based on the test structure to strengthen the plan or reduce costs.

[0034] The beneficial effects of the present invention are:

[0035] 1) The present invention conducts modal testing on the electric drive and suspension as a whole, which is consistent with the actual vehicle state, and the test results are more authentic;

[0036] 2) The device has a simple structure and fast construction speed. It can be directly tested on the bench without assembling a trial vehicle for NVH modal testing, thus saving test cycles and costs;

[0037] 3) The present invention can input different working conditions forces and speeds into the loading device, simulate different operating conditions of the actual vehicle, and test a variety of experimental results;

[0038] 4) The present invention performs bench testing, shortens the verification cycle and costs, and can reduce the design margin on the design side, further saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 This is a structural schematic diagram of a new energy vehicle electric drive and suspension bracket NVH frequency avoidance test device according to the present invention;

[0041] Figure 2 is a schematic diagram of the first pasting position;

[0042] Figure 3 Schematic diagram of the second pasting position.

[0043] In the figure:

[0044] 1. Electric drive; 2. Axle; 3. Actuator; 4. Hub; 5. Suspension connection tooling; 6. Modal tester; 7. Three-way sensor; 8. Hammer; 9. Signal line; 10. Laboratory base; 11. Suspension; 12. First pasting position; 13. Second pasting position. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0047] Embodiment 1

[0048] See also Figure 1 and Figure 2 , this embodiment provides a new energy vehicle electric drive and suspension bracket NVH frequency avoidance test device, including an electric drive 1, a half shaft 2, an actuator 3, a rotating hub 4, a suspension connection tool 5, a modal tester 6, a three-way sensor 7, a force hammer 8, a signal line 9, a laboratory base 10 and a suspension 11;

[0049] The actuator 3 is placed on a laboratory base 10 to ensure the levelness of all devices and reduce test errors;

[0050] The rotating hub 4 is placed on the laboratory base 10 to ensure the levelness of all devices and reduce test errors;

[0051] The suspension connection fixture 5 is connected to the actuator 3 by bolts to ensure that the bolt connection strength is qualified during the test and the posture of the electric drive 1 is consistent with that of the vehicle in actual operation;

[0052] One end of the active end bracket of the suspension 11 is connected to the actuator 3 by bolts, and the other end is connected to the electric drive housing of the electric drive 1 by bolts;

[0053] One end of the half shaft 2 is connected to the rotating hub 4, and the other end is connected to the electric drive 1;

[0054] The three-way sensor 7 is attached to the weak parts of the shell and suspension mode; the weak parts of the mode are the plane or the arm position far away from the fastening point, with large vibration and low mode, such as Figure 2 and Figure 3 As shown, the shell and the bracket are knocked by force 8. The position in the figure is a schematic diagram of pasting, and the specific pasting position needs to be confirmed according to the specific structure.

[0055] The three-way sensor 7 is connected to the suspension 11 ; the modal tester 6 is connected to the suspension 11 and the electric drive 1 via a signal line 9 ; and the force hammer 8 is connected to the modal tester 6 .

[0056] In summary, the device has a simple structure and fast construction speed, and can be directly used for bench testing. There is no need to assemble a trial vehicle for NVH modal testing, thus saving test cycles and costs.

[0057] Embodiment 2

[0058] This embodiment provides a new energy vehicle electric drive and suspension bracket NVH frequency avoidance test method, including:

[0059] Step 1: Perform modal simulation and confirm the corresponding test conditions, as follows:

[0060] The digital models of the electric drive housing and suspension bracket are placed in the simulation software for modal analysis and calculation, multi-order modes are output, and the corresponding working conditions, speeds and loads are selected.

[0061] Step 2: Select the loading device, as follows:

[0062] According to the parameters of the electric drive 1, suspension 11, working conditions, speed and load, select the appropriate actuator 3 and hub 4. The selected equipment should be easy to operate and install and disassemble, and the selected equipment should also be able to meet the tested working conditions.

[0063] Step 3: Make the suspension connection tool 5, using an existing structure that can be connected to the actuator 3 by bolts.

[0064] Step 4: Debug the test equipment.

[0065] Step 5: Confirm the modal weak parts of the housing of the electric drive 1 and the suspension bracket 11, as follows: Through the analysis of step 1, the positions of the electric drive housing and the suspension bracket with large amplitudes are obtained. The positions with large amplitudes are usually planes or arms far away from the installation point. Such positions are usually modal weak positions due to their weak structures. According to the previous simulation, find the modal weak parts of the electric drive assembly and the suspension bracket. The selected parts should be as smooth as possible to facilitate the attachment of sensors.

[0066] Step six, build the test bench 6, connect the electric drive 1, the suspension bracket, and the half-shaft 2 together; adjust the position of the actuator 3, and connect the suspension bracket and the actuator 3 together; adjust the position of the hub 4, and connect the half-shaft 2 and the hub 4 together.

[0067] Step 7: Paste the three-way sensor 7. After connecting the sensor to the signal line, paste it in the corresponding position. The other end of the signal line is connected to the modal tester, such as Figure 2 and Figure 3 shown.

[0068] Step 8. Strike the test component by connecting the force hammer (8) to the modal tester (6). Hold the force hammer (8) and strike it. The striking point should be selected at the part of the sample where the stiffness is large and the vibration is obvious. It should not be located at the weak point of the mode of interest. Choose a suitable hammer head. The frequency band excited by a hard hammer head is wider, while the frequency band excited by a soft hammer head is narrower. In this experiment, it is recommended to use a white plastic soft head. The hammering should be regular, requiring the hammering to hit the same point, the same direction, and the force to be equal. The hammering should be crisp and clear.

[0069] Step 9. Read the test data, read the modes of the weak parts through the modal tester, analyze whether the shell and suspension modes and structures meet the design requirements, and analyze the optimization plan based on the test structure to strengthen the plan or optimize the cost.

[0070] To avoid resonance between the electric drive and the suspension, the vibration of the electric drive is transmitted to the cabin through the suspension, causing NVH vibration problems, including steering wheel and pedal vibration, etc., the electric drive mode and the suspension bracket mode must be deviated, that is, frequency avoidance. If the modes are close, the suspension bracket structure can be optimized to avoid frequency.

[0071] Step 10: Complete the test and output the test report.

[0072] In summary, the present invention can input different working conditions forces and rotation speeds into the loading device, simulate different operating conditions of the actual vehicle, and test a variety of experimental results.

[0073] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and implementation mode. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A new energy vehicle electric drive and suspension bracket NVH frequency avoidance test device, characterized in that: It includes an electric drive (1), a half shaft (2), an actuator (3), a rotating hub (4), a suspension connection tool (5), a modal tester (6), a three-way sensor (7), a force hammer (8), a signal line (9), a laboratory base (10) and a suspension (11); The actuator (3) and the rotating hub (4) are placed on a laboratory base (10); The suspension connection tool (5) is fixed on the actuator (3); One end of the active end bracket of the suspension (11) is connected to the actuator (3), and the other end is connected to the electric drive housing of the electric drive (1); one end of the half shaft (2) is connected to the rotating hub (4), and the other end is connected to the electric drive (1); the three-way sensor (7) is attached to the modal weak parts of the housing and the suspension, and the modal weak parts are planes or arm positions far away from the fastening points, with large vibration and low modal; the three-way sensor (7) is connected to the suspension (11); the modal tester (6) is connected to the suspension (11) and the electric drive (1) through a signal line (9); and the force hammer (8) is connected to the modal tester (6).

2. The NVH frequency avoidance test device for electric drive and suspension bracket of new energy vehicle according to claim 1 is characterized in that: The suspension connection tool (5) is connected to the actuator (3) via bolts.

3. The NVH frequency avoidance test device for electric drive and suspension bracket of new energy vehicle according to claim 1 is characterized in that: One end of the active end bracket of the suspension (11) is connected to the actuator (3) via bolts, and the other end is connected to the electric drive housing of the electric drive (1) via bolts.

4. The test method of a new energy vehicle electric drive and suspension bracket NVH frequency avoidance test device according to claim 1, characterized in that: The following steps are involved: Step 1: Perform modal simulation and confirm the corresponding test conditions; Step 2: Select the loading device; Step 3: Making a suspension connection tool (5); Step 4: Debug the test equipment; Step 5: confirm the modal weak points of the housing of the electric drive (1) and the suspension (11) bracket; Step 6: Building a test bench (6); Step 7: Paste the three-way sensor (7); Step 8: tap the test component; Step nine, read the test data; Step 10: Complete the test and output the test report.

5. The testing method of the NVH frequency avoidance testing device for electric drive and suspension bracket of new energy vehicle according to claim 4 is characterized in that: The specific method of step one is as follows: The digital models of the electric drive housing and suspension bracket are placed in the simulation software for modal analysis and calculation, multi-order modes are output, and the corresponding working conditions, speeds and loads are selected.

6. The test method of the NVH frequency avoidance test device for electric drive and suspension bracket of new energy vehicle according to claim 4 is characterized in that: The specific method of step 2 is as follows: According to the parameters of the electric drive (1), suspension (11), working conditions, rotation speed and load, an appropriate actuator (3) and a rotating hub (4) are selected. The selected equipment should be easy to operate and easy to install and disassemble. The selected equipment should also be able to meet the working conditions to be tested.

7. The testing method of the NVH frequency avoidance testing device for electric drive and suspension bracket of new energy vehicle according to claim 4 is characterized in that: The specific method of step five is as follows: Through the analysis in step 1, it is found that the locations with large amplitudes of the electric drive housing and the suspension bracket are modal weak locations.

8. The testing method of the NVH frequency avoidance testing device for electric drive and suspension bracket of new energy vehicle according to claim 4 is characterized in that: The specific method of step six is ​​as follows: A test bench is constructed, and the electric drive (11), the suspension bracket, and the half shaft (2) are connected together; the position of the actuator (3) is adjusted, and the suspension bracket and the actuator (3) are connected together; the position of the rotating hub (4) is adjusted, and the half shaft (2) and the rotating hub (4) are connected together.

9. The testing method of the NVH frequency avoidance testing device for electric drive and suspension bracket of new energy vehicle according to claim 4 is characterized in that: The specific method of step eight is as follows: The force hammer (8) is connected to the modal tester (6), and the force hammer (8) is held and used to strike; the striking should be regular, requiring striking at the same point, in the same direction, and with equal force.

10. The testing method of the NVH frequency avoidance testing device for electric drive and suspension bracket of new energy vehicle according to claim 4, characterized in that: The specific method of step nine is as follows: The modal tester (6) is used to read the modal weak parts, analyze whether the shell and suspension modes and structures meet the design requirements, and analyze the optimization plan based on the test structure to strengthen the plan or reduce the cost.

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