Vehicle NVH performance attenuation analysis method, device and storage medium

Abstract

The present invention discloses a vehicle NVH performance attenuation analysis method, device and storage medium, wherein the method part comprises: obtaining NVH performance test data of the vehicle at different mileages, the NVH performance test data comprising noise data and vibration data of different measuring points on the vehicle under different working conditions, determining noise energy increment data and vibration energy increment data of the vehicle at different mileages according to the NVH performance test data of the vehicle at different mileages, and analyzing the NVH performance attenuation of the vehicle according to the noise energy increment data and vibration energy increment data of the vehicle at different mileages; the present invention proposes an NVH performance attenuation analysis method based on energy increment, which expresses the variation of noise and vibration in the form of energy increment, so that the variation of noise and vibration can be compared in the same dimension, and the attenuation of noise and vibration on the vehicle after the mileage increases can be quickly identified, thereby accurately analyzing the NVH performance attenuation of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle NVH performance, and in particular to a vehicle NVH performance attenuation analysis method, device and storage medium. Background Art

[0002] After a vehicle leaves the factory, as the mileage increases, the functional characteristics of the vehicle, system and components will decrease to a certain extent, which will lead to the deterioration of the noise, vibration and harshness (NVH) performance of high-mileage vehicles. Noise attenuation and vibration attenuation are both important components that affect the NVH performance of a vehicle. Since decibels are usually used to represent noise and acceleration is used to represent vibration, the existing solutions can only evaluate the NVH performance of a vehicle through the noise attenuation or vibration attenuation of the vehicle.

[0003] For example, the vehicle is tested at the initial state and at 100,000 km mileage, and the noise data of the driver's right ear at the initial state and at 100,000 km mileage are obtained. The noise of the driver's right ear at the initial state is compared with the noise of the driver's right ear at 100,000 km mileage, and the degree of attenuation of the vehicle's NVH performance is determined according to the increase in the noise value. The existing solution can only analyze the NVH performance of the vehicle through the noise attenuation or vibration attenuation of the vehicle, which makes it impossible to accurately analyze the NVH performance of the vehicle. Summary of the invention

[0004] The present invention provides a vehicle NVH performance attenuation analysis method, device and storage medium to solve the problem in the prior art that the NVH performance of the vehicle is evaluated by the noise attenuation or vibration attenuation of the vehicle, resulting in an inability to accurately evaluate the NVH performance of the vehicle.

[0005] A vehicle NVH performance attenuation analysis method is provided, comprising:

[0006] Obtain NVH performance test data of the vehicle at different mileages. The NVH performance test data includes noise data and vibration data of different measuring points on the vehicle under different working conditions.

[0007] According to the NVH performance test data of the vehicle at different mileages, determine the noise energy increment data and vibration energy increment data of the vehicle at different mileages;

[0008] The vehicle's NVH performance attenuation is analyzed based on the noise energy increment data and vibration energy increment data at different mileages.

[0009] Furthermore, based on the noise energy increment data and vibration energy increment data of the vehicle at different mileages, the NVH performance attenuation of the vehicle is analyzed, including:

[0010] The noise responses of the noise measuring points on the vehicle under different working conditions are used as multiple noise indices, and the vibration responses of the vibration measuring points on the vehicle under different working conditions are used as multiple vibration indices;

[0011] Determine the attenuation amount of each noise index and the attenuation amount of each vibration index at different mileages in the noise energy increment data and the vibration energy increment data of the vehicle at different mileages;

[0012] According to the attenuation of each noise index and the attenuation of each vibration index at different mileages, the noise index or vibration index with the fastest attenuation of the vehicle at the same mileage is determined.

[0013] Furthermore, according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages, the attenuation amount of each noise index and the attenuation amount of each vibration index at different mileages are determined, including:

[0014] Determine the noise energy increment of each noise measuring point under different working conditions at the same mileage as the attenuation of each noise index at the same mileage;

[0015] The vibration energy increment of each vibration measuring point under different working conditions at the same mileage is determined as the attenuation of each vibration index at the same mileage, so as to obtain the attenuation of each vibration index at different mileages.

[0016] Further, according to the NVH performance test data of the vehicle at different mileages, the noise energy increment data and the vibration energy increment data of the vehicle at different mileages are determined, including:

[0017] According to the noise data of different measuring points on the vehicle under different working conditions, the noise energy of the noise measuring points under different working conditions is determined to obtain the noise energy data of the vehicle at different mileages;

[0018] According to the vibration data of the vibration measuring points on the vehicle under different working conditions, the vibration energy of the vibration measuring points on the vehicle under different working conditions is determined to obtain the vibration energy data of the vehicle at different mileages;

[0019] Noise energy increment data and vibration energy increment data of the vehicle at different mileages are determined according to the noise energy data and vibration energy data of the vehicle at different mileages.

[0020] Further, according to the noise energy data and the vibration energy data of the vehicle at different mileages, the noise energy increment data and the vibration energy increment data of the vehicle at different mileages are determined, including:

[0021] Determine the noise energy data and the vibration energy data of the vehicle at an initial mileage, and determine the noise energy data and the vibration energy data of the vehicle at each high mileage;

[0022] Determine the incremental percentage of the noise energy of the vehicle at each high mileage relative to the initial mileage, and obtain the noise energy incremental data of the vehicle at different mileages;

[0023] The incremental percentage of the vibration energy of the vehicle at each high mileage relative to the initial mileage is determined to obtain the vibration energy incremental data of the vehicle at different mileages.

[0024] Furthermore, the noise energy of the noise measurement point under different working conditions is calculated by the following formula:

[0025]

[0026] Among them, I is the noise energy of the noise measuring point under a certain working condition, p is the noise sound pressure of the noise measuring point under a certain working condition, ρ is the air density; c is the speed of sound.

[0027] Furthermore, the vibration energy of the vibration measuring point under different working conditions is calculated by the following formula:

[0028]

[0029] Where E is the vibration energy of the vibration measuring point under a certain working condition, a rss It is the vibration acceleration of the vibration measuring point under a certain working condition.

[0030] Furthermore, the NVH performance test data of the vehicle at different mileages is obtained in the following way:

[0031] a. Perform NVH performance tests on the vehicle in its initial factory state under different working conditions, obtain noise data of each noise measuring point on the vehicle under different working conditions and vibration data of each vibration measuring point under different working conditions, as the noise data and vibration data of the vehicle at the initial mileage;

[0032] b. Determine the preset mileage and conduct a road test on the vehicle to ensure that the actual mileage of the vehicle reaches the preset mileage value;

[0033] c. After the road test, the NVH performance test is carried out on the vehicle under different working conditions to obtain the noise data of each noise measuring point on the vehicle under different working conditions and the vibration data of each vibration measuring point under different working conditions as the noise data and vibration data of the vehicle at the preset mileage;

[0034] d. Change the preset mileage and repeat steps b to c until all preset mileages are traversed to obtain noise data and vibration data of the vehicle at different mileages.

[0035] A vehicle NVH performance attenuation analysis device is also provided, comprising:

[0036] An acquisition module is used to acquire NVH performance test data of the vehicle at different mileages. The NVH performance test data includes noise data and vibration data of different measuring points on the vehicle under different working conditions.

[0037] A determination module, used to determine noise energy increment data and vibration energy increment data of the vehicle at different mileages according to NVH performance test data of the vehicle at different mileages;

[0038] The analysis module is used to analyze the NVH performance attenuation of the vehicle based on the noise energy increment data and vibration energy increment data of the vehicle at different mileages.

[0039] A vehicle NVH performance degradation analysis device is also provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned vehicle NVH performance degradation analysis method are implemented.

[0040] A readable storage medium is also provided, which stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned vehicle NVH performance attenuation analysis method are implemented.

[0041] In one solution provided by the above-mentioned vehicle NVH performance attenuation analysis method, device and storage medium, NVH performance test data of the vehicle at different mileages are obtained, and the NVH performance test data include noise data and vibration data of different measuring points on the vehicle under different working conditions. Then, according to the NVH performance test data of the vehicle at different mileages, the noise energy increment data and vibration energy increment data of the vehicle at different mileages are determined. Finally, according to the noise energy increment data and vibration energy increment data of the vehicle at different mileages, the NVH performance attenuation of the vehicle is analyzed. The present invention proposes an NVH performance attenuation analysis method based on energy increment, which expresses the change in noise and vibration in the form of energy increment, so that the change in noise and vibration can be compared in the same dimension, and the attenuation of noise and vibration on the vehicle after the mileage increases can be quickly identified, so that the vehicle NVH performance attenuation analysis can be accurately performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0043] Figure 1 is a structural schematic diagram of a vehicle NVH performance attenuation analysis system in one embodiment of the present invention;

[0044] Figure 2 is a flow chart of a vehicle NVH performance attenuation analysis method according to an embodiment of the present invention;

[0045] Figure 3 yes Figure 2 The schematic diagram of the implementation process of step S30;

[0046] Figure 4 3. It is a graph of energy increase rate at mileages of 30,000 km and 60,000 km in one embodiment of the present invention;

[0047] Figure 5 is a structural schematic diagram of a vehicle NVH performance attenuation analysis device in one embodiment of the present invention;

[0048] Figure 6 Schematic diagram of another structure of a vehicle NVH performance attenuation analysis device in one embodiment of the present invention. DETAILED DESCRIPTION

[0049] 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 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.

[0050] The vehicle NVH performance attenuation analysis method provided by the embodiment of the present invention can be applied in the following aspects: Figure 1 In the vehicle NVH performance attenuation analysis system, the vehicle NVH performance attenuation analysis system includes a vehicle 101 and a vehicle NVH performance attenuation analysis device 102, wherein the vehicle communicates with the vehicle NVH performance attenuation analysis device through a network. After the vehicle is subjected to NVH performance tests at different mileages, the vehicle NVH performance attenuation analysis device obtains the NVH performance test data of the vehicle at different mileages, the NVH performance test data including noise data and vibration data of different measuring points on the vehicle under different working conditions, and then determines the noise energy increment data and vibration energy increment data of the vehicle at different mileages according to the NVH performance test data of the vehicle at different mileages, and finally analyzes the NVH performance attenuation of the vehicle according to the noise energy increment data and vibration energy increment data of the vehicle at different mileages; the present invention proposes an NVH performance attenuation analysis method based on energy increment, which expresses the variation of noise and vibration by means of energy increment, so that the variation of noise and vibration can be compared in the same dimension, and the attenuation of noise and vibration on the vehicle after the mileage increases can be quickly identified, and the vehicle NVH performance attenuation can be accurately analyzed.

[0051] The vehicle NVH performance attenuation analysis device may be any personal computer, laptop, smart phone, tablet computer, or may be implemented using an independent server or a server cluster consisting of multiple servers.

[0052] In this embodiment, the vehicle NVH performance attenuation analysis system includes a vehicle and a vehicle NVH performance attenuation analysis device for exemplary purposes only. In other embodiments, the vehicle NVH performance attenuation analysis system may also include other devices, for example, a test device for performing NVH performance tests of vehicles at different mileages, the test device including an NVH performance test device and a road test device. The road test device is used to perform road tests of different mileages on vehicles (new vehicles) in their initial factory state; the NVH performance test device is used to perform NVH performance tests of vehicles at different mileages under different working conditions to obtain NVH performance test data of vehicles at different mileages.

[0053] In one embodiment, if Figure 2 As shown, a vehicle NVH performance attenuation analysis method is provided, and the method is applied in Figure 1 The vehicle NVH performance attenuation analysis device in the example is used as an example to illustrate, including the following steps:

[0054] S10: Obtain NVH performance test data of the vehicle at different mileages.

[0055] In this embodiment, before the vehicle NVH performance attenuation analysis device performs the vehicle NVH performance attenuation analysis, the test device needs to perform NVH performance tests on the vehicle at different mileages to obtain NVH performance test data of the vehicle at different mileages, wherein the NVH performance test data includes noise data and vibration data of different measuring points on the vehicle under different working conditions. That is, when performing NVH performance tests on the vehicle, different measuring points need to be set on the vehicle, and then the NVH performance tests of the vehicle under different working conditions are performed on the vehicle. To obtain the response data of different measuring points under different working conditions as NVH performance test data. Among them, the measuring points include noise measuring points and vibration measuring points. When performing NVH performance tests on a vehicle at a certain mileage under different working conditions, the noise data of the noise measuring points under different working conditions are obtained, and the vibration data of the vibration measuring points under different working conditions are obtained as the NVH performance test data of the vehicle, so that the NVH performance test data of the vehicle at different mileages can be obtained. Among them, the noise data and vibration data of different measuring points under different working conditions are respectively expressed in the form of noise sound pressure and vibration acceleration.

[0056] After completing the NVH performance test of the vehicle at different mileages, the NVH performance test data of the vehicle at different mileages obtained from the test is sent to the vehicle NVH performance attenuation analysis device, so that the vehicle NVH performance attenuation analysis device performs NVH performance attenuation analysis on the vehicle.

[0057] S20: Determine noise energy increment data and vibration energy increment data of the vehicle at different mileages according to NVH performance test data of the vehicle at different mileages.

[0058] After obtaining the NVH performance test data of the vehicle at different mileages, the vehicle NVH performance attenuation analysis device needs to determine the noise energy increment data and the vibration energy increment data of the vehicle at different mileages based on the NVH performance test data of the vehicle at different mileages.

[0059] Specifically, the NVH performance test data of the vehicle at different mileages can be converted into energy data of the vehicle at different mileages, and then the noise energy increment data and vibration energy increment data of the vehicle at different mileages can be determined according to the energy data of the vehicle at different mileages. That is, the noise data of the vehicle at different mileages is converted into noise energy data, and the vibration data of the vehicle at different mileages is converted into vibration energy data, and then the noise energy increment data of the vehicle at different mileages is determined according to the noise energy data of the vehicle at different mileages, and the noise energy increment data of the vehicle at different mileages is determined according to the vibration energy data of the vehicle at different mileages.

[0060] Among them, the noise energy data is the noise energy of different noise measuring points under different working conditions, and correspondingly, the noise energy increment data includes the noise energy increment of different noise measuring points under different working conditions; the vibration energy data includes the vibration energy of different vibration measuring points under different working conditions, and correspondingly, the vibration energy increment data is the vibration energy increment of different vibration measuring points under different working conditions.

[0061] Among them, the noise energy increment data of the vehicle at each mileage can be the noise energy increase rate (percentage) of the vehicle at each mileage relative to the initial mileage; the vibration energy increment data of the vehicle at each mileage is the vibration energy increase rate (percentage) of the vehicle at each mileage relative to the initial mileage. Taking the noise measurement point under a certain working condition as an example, the noise energy increment of the noise measurement point at each mileage is the energy increase rate of the noise energy of the noise measurement point at each mileage relative to the initial mileage; taking the vibration measurement point under a certain working condition as an example, the vibration energy increment of the vibration measurement point at each mileage is the energy increase rate of the vibration energy of the vibration measurement point at each mileage relative to the initial mileage. In this embodiment, the initial mileage is the mileage of the vehicle when it is in the initial factory state. The initial mileage can be 0 mileage or other mileages less than the preset mileage value, wherein the preset mileage value is pre-set and does not affect the mileage value of the subsequent NVH performance test of the vehicle at different mileages. The energy increase rate relative to the initial mileage can fully reflect the NVH performance attenuation of the vehicle during its life cycle.

[0062] In other embodiments, the noise energy increment data of the vehicle at each mileage may also be the noise energy increase rate (percentage) of the vehicle at each mileage relative to the previous mileage; the vibration energy increment data of the vehicle at each mileage may be the vibration energy increase rate (percentage) of the vehicle at each mileage relative to the previous mileage, which will not be repeated here.

[0063] S30: Analyze the NVH performance attenuation of the vehicle according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages.

[0064] After acquiring the noise energy increment data and the vibration energy increment data of the vehicle at different mileages, the vehicle NVH performance attenuation analysis device analyzes the NVH performance attenuation of the vehicle based on the noise energy increment data and the vibration energy increment data of the vehicle at different mileages.

[0065] In one solution provided by the above-mentioned vehicle NVH performance attenuation analysis method, device and storage medium, NVH performance test data of the vehicle at different mileages are obtained, and the NVH performance test data include noise data and vibration data of different measuring points on the vehicle under different working conditions. Then, according to the NVH performance test data of the vehicle at different mileages, the noise energy increment data and vibration energy increment data of the vehicle at different mileages are determined. Finally, according to the noise energy increment data and vibration energy increment data of the vehicle at different mileages, the NVH performance attenuation of the vehicle is analyzed. In this embodiment, an NVH performance attenuation analysis method based on energy increment is proposed, which expresses the change in noise and vibration in the form of energy increment, so that the change in noise and vibration can be compared in the same dimension, and the attenuation of noise and vibration on the vehicle after the mileage increases can be quickly identified, so as to accurately analyze the NVH performance attenuation of the vehicle.

[0066] In one embodiment, step S20, i.e., determining the noise energy increment data and the vibration energy increment data of the vehicle at different mileages according to the NVH performance test data of the vehicle at different mileages, specifically includes the following steps:

[0067] S21: Determine the noise energy of the noise measuring points under different working conditions according to the noise data of different measuring points on the vehicle under different working conditions, so as to obtain the noise energy data of the vehicle at different mileages.

[0068] After obtaining the NVH performance test data of the vehicle at different mileages, the noise energy of the noise measuring points under different working conditions is calculated based on the noise data of different measuring points on the vehicle under different working conditions. The noise energy of each noise measuring point under different working conditions at the same mileage is summarized to obtain the noise energy data of the vehicle at the mileage, and then the noise energy data of the vehicle at different mileages can be obtained.

[0069] Specifically, the noise energy of the noise measurement point under different working conditions is calculated by the following formula:

[0070]

[0071] Among them, I is the noise energy at the noise measurement point under a certain working condition, p is the noise sound pressure at the noise measurement point under a certain working condition, ρ is the air density; c is the speed of sound.

[0072] Where I is the sound energy per unit area perpendicular to the direction of sound wave propagation, expressed in W / m2. 2 ).

[0073] S22: Determine the vibration energy of the vibration measuring point on the vehicle under different working conditions according to the vibration data of the vibration measuring point on the vehicle under different working conditions, so as to obtain the vibration energy data of the vehicle at different mileages.

[0074] After obtaining the NVH performance test data of the vehicle at different mileages, the vibration energy of the vibration measuring points under different working conditions is calculated based on the vibration data of different measuring points on the vehicle under different working conditions. The vibration energy of each vibration measuring point under different working conditions at the same mileage is summarized to obtain the vibration energy data of the vehicle at the mileage, and then the vibration energy data of the vehicle at different mileages can be obtained.

[0075] Specifically, the vibration energy of the vibration measuring point under different working conditions is calculated by the following formula:

[0076]

[0077] Where E is the vibration energy of the vibration measuring point under a certain working condition, a rss is the vibration acceleration of the vibration measurement point under a certain working condition.

[0078] In this embodiment, the vibration data at each vibration measuring point on the vehicle is picked up by a three-axis vibration acceleration sensor, so the vibration acceleration of the vibration measuring point under a working condition is calculated by the following formula:

[0079]

[0080] Among them, a x 、a y and a zThey are the effective values ​​of the vibration acceleration of the vibration measuring point in the x-direction, y-direction and z-direction respectively. The effective value of the vibration acceleration is the root mean square value of the vibration acceleration in each direction. Its square is the mean square value, which represents the average power of the signal in engineering, and can therefore be used to express the energy of the vibration signal per unit time. If you need to calculate the total vibration energy of a vibration measuring point per unit time, you need to add up the energy in the three directions, that is, add up the mean square values ​​of the vibrations in the three directions. Therefore, the vibration energy of a vibration measuring point per unit time is expressed by the formula:

[0081]

[0082] S23: Determine noise energy increment data and vibration energy increment data of the vehicle at different mileages according to the noise energy data and vibration energy data of the vehicle at different mileages.

[0083] After obtaining the vibration energy data of the vehicle at different mileages, it is necessary to determine the noise energy increment data and the vibration energy increment data of the vehicle at different mileages according to the noise energy data and the vibration energy data of the vehicle at different mileages.

[0084] Specifically, according to the noise energy data and the vibration energy data of the vehicle at different mileages, determining the noise energy increment data and the vibration energy increment data of the vehicle at different mileages includes the following steps:

[0085] S231: Determine the noise energy data and the vibration energy data of the vehicle at an initial mileage, and determine the noise energy data and the vibration energy data of the vehicle at each high mileage.

[0086] In this embodiment, different mileages include an initial mileage and multiple high mileages. Among the noise energy data and vibration energy data of the vehicle at different mileages, the noise energy data and vibration energy data of the vehicle at the initial mileage are determined, and the noise energy data and vibration energy data of the vehicle at each high mileage are determined.

[0087] S232: Determine the incremental percentage of the noise energy of the vehicle at each high mileage relative to the initial mileage, and obtain noise energy incremental data of the vehicle at different mileages.

[0088] After determining the noise energy data of the vehicle at the initial mileage and the noise energy data of the vehicle at each high mileage, the noise energy data of the vehicle at the initial mileage is used as the benchmark noise energy, and the incremental percentage (energy increase rate) of the noise energy of the vehicle at each high mileage relative to the initial mileage is determined to obtain the noise energy incremental data of the vehicle at different mileages.

[0089] For example, if there is only one noise measurement point on the vehicle, the noise energy of the vehicle at the initial mileage is I, and the noise energy of the vehicle at mileage i is Ii , then the incremental percentage of noise energy (energy increase rate) of the vehicle at mileage i is A i , calculated by the following formula:

[0090]

[0091] because:

[0092]

[0093] Therefore, in other embodiments, the incremental percentage (energy increase rate) of the noise energy of the vehicle at i mileage is A i , the incremental percentage of the noise energy of the vehicle at mileage i can be directly calculated based on the noise data. The calculation formula is as follows:

[0094]

[0095] Where p is the noise pressure of the vehicle at the initial mileage, that is, the noise pressure at the noise measurement point under a certain working condition; p i is the noise pressure of the vehicle at mileage i, that is, the noise pressure at the noise measurement point under the same working conditions.

[0096] According to the above formula, based on the noise sound pressure obtained at different noise measuring points, the incremental percentage of noise energy at different mileages, that is, the noise energy increment of the noise measuring point, can be directly calculated to obtain the incremental percentage of noise energy of the vehicle at mileage i.

[0097] S233: Determine the incremental percentage of the vibration energy of the vehicle at each high mileage relative to the initial mileage, and obtain the vibration energy incremental data of the vehicle at different mileages.

[0098] After determining the vibration energy data of the vehicle at the initial mileage and the vibration energy data of the vehicle at each high mileage, the vibration energy data of the vehicle at the initial mileage is used as the benchmark vibration energy, and the incremental percentage (energy increase rate) of the vibration energy of the vehicle at each high mileage relative to the initial mileage is determined, so that the vibration energy incremental data of the vehicle at different mileages can be obtained.

[0099] For example, if there is only one vibration measurement point on the vehicle, the vibration energy of the vehicle at the initial mileage is E, and the vibration energy of the vehicle at mileage i is E i , then the incremental percentage (energy increase rate) of the vehicle's vibration energy at mileage i is V i , calculated by the following formula:

[0100]

[0101] because:

[0102]

[0103] Among them, a rss is the vibration acceleration of the vehicle at the initial mileage, that is, the vibration acceleration of the vibration measurement point under a certain working condition; is the vibration acceleration of the vehicle at mileage i, that is, the vibration acceleration of the vibration measurement point under the same working condition; a x 、a y and a z They are the effective values ​​of vibration acceleration in the x-direction, y-direction and z-direction of the vibration measuring point at the initial mileage respectively; and They are the effective values ​​of vibration acceleration in the x, y and z directions of the vibration measuring point at mileage i respectively.

[0104] Therefore, in other embodiments, the incremental percentage (energy increase rate) of the vibration energy of the vehicle at i mileage is V i , the incremental percentage of the vehicle's vibration energy at i mileage can be directly calculated based on the vibration data. The calculation formula is as follows:

[0105]

[0106] According to the above formula, based on the three-dimensional vibration acceleration obtained at different vibration measuring points, the incremental percentage of the vibration energy of the vibration measuring points at different mileages, that is, the vibration energy increment of the vibration measuring points, can be directly calculated to obtain the incremental percentage of the vibration energy of the vehicle at mileage i.

[0107] In this embodiment, by determining the noise energy data and vibration energy data of the vehicle at the initial mileage, and determining the noise energy data and vibration energy data of the vehicle at each high mileage, and then determining the incremental percentage of the noise energy of the vehicle at each high mileage relative to the initial mileage, the noise energy incremental data of the vehicle at different mileages are obtained, and determining the incremental percentage of the vibration energy of the vehicle at each high mileage relative to the initial mileage, the vibration energy incremental data of the vehicle at different mileages are obtained, and the specific steps of determining the noise energy incremental data and the vibration energy incremental data of the vehicle at different mileages according to the NVH performance test data of the vehicle at different mileages are clarified, which provides a basis for subsequent analysis of the NVH performance attenuation of the vehicle according to the noise energy incremental data and the vibration energy incremental data of the vehicle at different mileages.

[0108] In one embodiment, if Figure 3 As shown, in step S30, the NVH performance attenuation of the vehicle is analyzed according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages, which specifically includes the following steps:

[0109] S31: taking noise responses of noise measuring points on the vehicle under different working conditions as a plurality of noise indices, and taking vibration responses of vibration measuring points on the vehicle under different working conditions as a plurality of vibration indices.

[0110] It should be understood that the noise data of the noise measuring points on the vehicle under different working conditions is the noise response of the noise measuring points on the vehicle under different working conditions; the vibration data of the vibration measuring points on the vehicle under different working conditions is the vibration response of the vibration measuring points on the vehicle under different working conditions. In order to clarify the NVH performance representation of different measuring points under different working conditions, it is necessary to establish NVH performance analysis indicators for characterizing the measuring points under different working conditions, wherein the NVH performance analysis indicators include two types of multiple noise indicators and vibration indicators. That is, the noise response of the noise measuring points on the vehicle under different working conditions needs to be used as multiple noise indicators, so that the noise attenuation of the vehicle under different working conditions and different measuring point positions can be directly analyzed according to different noise indicators in the future; multiple vibration indicators represent the vibration measuring points under different working conditions, so that the vibration attenuation of the vehicle under different working conditions and different measuring point positions can be directly analyzed according to different vibration indicators in the future. Among them, each NVH performance analysis indicator corresponds to the measuring point position and working condition one by one.

[0111] Among them, different working conditions include different working states of the vehicle, load-on states, gear states, and driving surfaces, etc. Among them, the vehicle working state includes but is not limited to starting, idling, accelerating, constant speed, gliding and other working states; the driving surface includes but is not limited to rough roads, smooth roads and other roads; the load-on state includes the air conditioning on state (ACOn) and the air conditioning on state (ACOff).

[0112] For example, taking a certain model of vehicle as an example, 12 NVH performance analysis indicators are selected to analyze the NVH performance attenuation of the vehicle. Among them, the 12 NVH performance analysis indicators include 8 noise indicators and 4 vibration indicators. Among them, the 8 noise indicators are: indicator 1, indicator 2, indicator 3, indicator 4, indicator 5, indicator 6, indicator 7 and indicator 8; the 4 vibration indicators are: indicator 9, indicator 10, indicator 11 and indicator 12.

[0113] The indicator descriptions of the above indicators 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 are shown in Table 1:

[0114] Table 1

[0115]

[0116] In this embodiment, 12 NVH performance analysis indicators are selected to analyze the NVH performance degradation of the vehicle. This is only for exemplary purposes. In other embodiments, other numbers of NVH performance analysis indicators may be used to analyze the NVH performance degradation of the vehicle.

[0117] In this embodiment, the indicator descriptions of the above 12 NVH performance analysis indicators are only for exemplary purposes. In other embodiments, the NVH performance analysis indicators may also represent other measuring point locations and other working conditions, which will not be described in detail here.

[0118] S32: Determine the attenuation amount of each noise index and the attenuation amount of each vibration index at different mileages from the noise energy increment data and the vibration energy increment data at different mileages of the vehicle.

[0119] After obtaining the noise energy increment data and the vibration energy increment data of the vehicle at different mileages, the attenuation amount of each noise index and the attenuation amount of each vibration index at different mileages can be determined from the noise energy increment data and the vibration energy increment data of the vehicle at different mileages.

[0120] S33: Determine the noise index or vibration index with the fastest attenuation at the same mileage according to the attenuation of each noise index and the attenuation of each vibration index at different mileages.

[0121] After determining the attenuation of each noise index and each vibration index at different mileages, determine the noise index or vibration index with the fastest attenuation at the same mileage based on the attenuation of each noise index and each vibration index at different mileages. The optimization index at different mileages is used to guide engineers to carry out corresponding analysis and research, find the key factors affecting the attenuation of vehicle NVH performance, and then optimize the relevant parts of the vehicle to effectively control the attenuation of the vehicle's NVH performance, thereby improving the efficiency of vehicle research and development.

[0122] In this embodiment, by taking the noise responses of noise measuring points on the vehicle under different working conditions as multiple noise indices, and taking the vibration responses of vibration measuring points on the vehicle under different working conditions as multiple vibration indices, the attenuation of each noise index and the attenuation of each vibration index at different mileages are determined in the noise energy increment data and the vibration energy increment data of the vehicle at different mileages, and the noise index or vibration index with the fastest attenuation at the same mileage of the vehicle is determined according to the attenuation of each noise index and the attenuation of each vibration index at different mileages. The specific process of analyzing the NVH performance attenuation of the vehicle according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages is clarified, and the noise index or vibration index with the fastest attenuation at the same mileage can be analyzed according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages as the optimization index, so as to optimize the relevant components of the vehicle according to the optimization index at different mileages, and then the NVH performance attenuation of the vehicle can be effectively optimized and controlled.

[0123] In one embodiment, step S30, i.e., determining the attenuation of each noise index and the attenuation of each vibration index at different mileages according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages, specifically includes the following steps:

[0124] S31: Determine the noise energy increment of each noise measuring point under different working conditions at the same mileage as the attenuation of each noise index at the same mileage.

[0125] Since the noise energy increment data includes the noise energy increment data of different noise measuring points under different working conditions, after obtaining the noise energy increment data of the vehicle at different mileages, the noise energy increment of each noise measuring point under different working conditions at the same mileage can be determined as the attenuation of each noise index at the same mileage, so as to obtain the attenuation of each noise index at different mileages. The noise energy of a certain noise index is the noise energy of a certain noise measuring point under a certain working condition; the attenuation of a certain noise index is the noise energy increment of a certain noise measuring point under a certain working condition.

[0126] S32: Determine the vibration energy increment of each vibration measuring point under different working conditions at the same mileage as the attenuation of each vibration index at the same mileage.

[0127] Since the vibration energy increment data includes the vibration energy increment data of different vibration measuring points under different working conditions, after obtaining the vibration energy increment data of the vehicle at different mileages, the vibration energy increment of each vibration measuring point under different working conditions at the same mileage can be determined as the attenuation of each vibration index at the same mileage, so as to obtain the attenuation of each vibration index at different mileages. The vibration energy of a certain vibration index is the vibration energy of a certain vibration measuring point under a certain working condition; the attenuation of a certain vibration index is the vibration energy increment of a certain vibration measuring point under a certain working condition.

[0128] In this embodiment, by determining the noise energy increment of each noise measuring point under different working conditions at the same mileage as the attenuation of each noise index at the same mileage, and determining the vibration energy increment of each vibration measuring point under different working conditions at the same mileage as the attenuation of each vibration index at the same mileage, the specific process of determining the attenuation of each noise index and the attenuation of each vibration index at different mileages according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages is clarified, which provides an analysis basis for subsequently analyzing the noise index or vibration index with the fastest attenuation at the same mileage according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages.

[0129] In one embodiment, before step S10, it is necessary to perform NVH performance tests on the vehicle at different mileages to obtain NVH performance test data of the vehicle at different mileages. The NVH performance test data of the vehicle at different mileages is obtained by:

[0130] a. Perform NVH performance tests on the vehicle in its initial factory state under different working conditions, obtain noise data of each noise measurement point on the vehicle under different working conditions and vibration data of each vibration measurement point under different working conditions, as the noise data and vibration data of the vehicle at the initial mileage.

[0131] Obtain the vehicle in its initial factory state (new vehicle at mass production level) and conduct a subjective evaluation of the NVH performance of the vehicle to confirm that the NVH level meets the development level. Then use the NVH performance test device to conduct NVH performance tests under different working conditions on the vehicle in its initial factory state, obtain the noise data of each noise measurement point on the vehicle under different working conditions and the vibration data of each vibration measurement point under different working conditions, as the noise data and vibration data of the vehicle at the initial mileage. At this time, the noise data and vibration data of the vehicle at the initial mileage are the noise data and vibration data of the vehicle at 0 mileage.

[0132] Among them, different working conditions include different working states of the vehicle, load-on states, gear states and driving surfaces, etc. Among them, the vehicle working state includes but is not limited to starting, idling, accelerating, constant speed, gliding and other working states; the driving surface includes but is not limited to rough roads, smooth roads and other roads; the load-on state includes the air conditioning on state (ACon) and the air conditioning on state (ACoff).

[0133] During the test, the B&K 4189 acoustic microphone and the B&K 4524 three-axis vibration acceleration sensor were used to collect the noise and vibration data inside the vehicle, and the LMS SCADS data acquisition system was used for data processing.

[0134] The noise measurement points are at the driver's right ear and the left ear of the right rear passenger, and the vibration measurement points are at the 12 o'clock position of the steering wheel and the position of the driver's seat rail. At the position of the driver's right ear and the left ear of the right rear passenger, a B&K 4189 acoustic microphone is arranged to pick up the noise inside the car; at the 12 o'clock position of the steering wheel and the position of the driver's seat rail, a B&K 4524 three-way vibration acceleration sensor is arranged to pick up vibration data.

[0135] b. Determine the preset mileage and conduct a road test on the vehicle to ensure that the actual mileage of the vehicle is the preset mileage value.

[0136] After the NVH performance test under different working conditions is carried out on the vehicle in the initial factory state, it is also necessary to carry out a road test on the vehicle in the initial factory state to increase the mileage of the vehicle to the preset mileage. In this process, it is necessary to select the preset mileage, and then use the road test device to carry out a road test on the vehicle so that the actual mileage of the vehicle is the preset mileage value.

[0137] When conducting a high-mileage road test on a vehicle, the preset mileages are 30,000 km, 60,000 km, 100,000 km, 150,000 km and 200,000 km. Each mileage segment includes four test road conditions, namely, expressways, urban roads, general roads and bad roads. Different road conditions have different proportions. For example, the proportions of expressways, urban roads, general roads and bad roads are 35%, 30%, 30% and 5% respectively. In this embodiment, the proportions of each road condition are only for illustrative purposes and will not be repeated here.

[0138] In order to ensure the objectivity of data measurement, each data collection is carried out in a fixed test field.

[0139] c. After the road test, the NVH performance of the vehicle is tested under different working conditions to obtain the noise data of each noise measuring point on the vehicle under different working conditions and the vibration data of each vibration measuring point under different working conditions as the noise data and vibration data of the vehicle at the preset mileage.

[0140] After the vehicle is road tested, the NVH performance test device is used again to conduct NVH performance tests under different working conditions on the vehicle that has reached the preset mileage after the road test, and the noise data of each noise measuring point on the vehicle under different working conditions and the vibration data of each vibration measuring point under different working conditions are obtained as the noise data and vibration data of the vehicle at the preset mileage.

[0141] d. Change the preset mileage and repeat steps b to c until all preset mileages are traversed to obtain noise data and vibration data of the vehicle at different mileages.

[0142] After obtaining the noise data and vibration data of the vehicle at the preset mileage, it is necessary to change the preset mileage and repeat steps b to c until all the preset mileages are traversed to obtain the noise data and vibration data of the vehicle at different mileages.

[0143] In this embodiment, NVH performance tests are performed on the vehicle in its initial factory state under different working conditions to obtain noise data of each noise measuring point on the vehicle under different working conditions and vibration data of each vibration measuring point under different working conditions, which are used as noise data and vibration data of the vehicle at the initial mileage; a preset mileage is determined, and a road test is performed on the vehicle so that the actual mileage of the vehicle is the preset mileage value; after the road test, NVH performance tests are performed on the vehicle under different working conditions to obtain noise data of each noise measuring point on the vehicle under different working conditions and vibration data of each vibration measuring point under different working conditions, which are used as noise data and vibration data of the vehicle at the preset mileage; the preset mileage is changed, and the test is repeated until all preset mileages are traversed to obtain noise data and vibration data of the vehicle at different mileages, which provides a basis for obtaining noise data and vibration data of the vehicle at different mileages.

[0144] For example, different mileages include 0 km (initial mileage), and five high mileages, namely 30,000 km, 60,000 km, 100,000 km, 150,000 km and 200,000 km.

[0145] First, a new mass-produced vehicle is selected and a subjective evaluation of NVH performance is conducted to confirm that the NVH level meets the level of most mass-produced new vehicles. After the vehicle is fully heated, the NVH performance of the new vehicle is tested under different working conditions, and the vibration acceleration or noise pressure data of the relevant measuring points are recorded as the NVH performance test data of the vehicle at 0km mileage. Then, a high-mileage road test is carried out on the vehicle. When the vehicle mileage reaches 30,000 km, the NVH performance of the vehicle is tested again under different working conditions, and the vibration acceleration or noise pressure data of the relevant measuring points are recorded as the NVH performance test data of the vehicle at 30,000 km mileage.

[0146] The vehicle is then subjected to a high-mileage road test. When the vehicle mileage reaches 60,000 km, the vehicle is again subjected to NVH performance tests under different working conditions. The vibration acceleration or noise sound pressure data of the relevant measuring points are recorded as the NVH performance test data of the vehicle at a mileage of 60,000 km.

[0147] Then, the vehicle is subjected to a high-mileage road test. When the vehicle mileage reaches 100,000 km, the vehicle is again subjected to NVH performance tests under different working conditions, and the vibration acceleration or noise sound pressure data of the relevant measuring points are recorded as the NVH performance test data of the vehicle at a mileage of 100,000 km.

[0148] The vehicle is then subjected to a high-mileage road test. When the vehicle mileage reaches 150,000 km, the vehicle is again subjected to NVH performance tests under different working conditions. The vibration acceleration or noise sound pressure data of the relevant measuring points are recorded as the NVH performance test data of the vehicle at a mileage of 150,000 km.

[0149] Finally, a high-mileage road test is carried out on the vehicle. When the vehicle mileage reaches 200,000 km, the NVH performance test is carried out again under different working conditions. The vibration acceleration or noise sound pressure data of the relevant measuring points are recorded as the NVH performance test data of the vehicle at 200,000 km mileage.

[0150] In this embodiment, different mileages include 0 km (initial mileage), and five high mileages of 30,000 km, 60,000 km, 100,000 km, 150,000 km and 200,000 km. This is only for illustrative purposes. In other embodiments, different mileages may also include mileages of other numerical values, which will not be repeated here.

[0151] After obtaining the NVH performance test data of the vehicle at 0km and 10km, calculate the vibration energy increment (percentage increase in vibration energy) and noise energy increment (percentage increase in noise energy) at each high mileage relative to 0km respectively; then, compare the vibration energy increment and noise energy increment at the same high mileage relative to 0km respectively, and identify the vibration index or noise index that decays faster when the vehicle reaches the mileage, so as to carry out relevant NVH performance analysis later.

[0152] For example, taking the above 12 NVH performance analysis indicators as an example, when the vehicle is at 0km mileage, 3km mileage and 65,000km mileage, the noise data and vibration data corresponding to the 12 NVH performance analysis indicators are shown in Table 2 below:

[0153] Table 2

[0154]

[0155] Since the units of noise and vibration data are inconsistent, they cannot be compared horizontally. Therefore, the noise and vibration data can be reprocessed using the aforementioned energy increase rate method to obtain the energy increase rate (unit: %) of 30,000 km mileage relative to 0 km and the energy increase rate (unit: %) of 65,000 km mileage relative to 0 km. The energy increase rates of the 12 NVH performance analysis indicators at 30,000 km mileage and 65,000 km mileage are plotted as curves, as shown in Figure 1. Figure 4 shown. Figure 4 A positive value on the ordinate in the figure indicates that the NVH performance of the indicator has declined, while a negative value indicates that the NVH performance of the indicator has improved. Figure 4 The attenuation of each indicator can be quickly obtained. For example, when the vehicle mileage reaches 65,000 km, the top three indicators with faster attenuation are: indicator 7, indicator 8 and indicator 6, all of which are uniform speed noise indicators, and show the characteristics of gradually attenuating with the increase of mileage (i.e. positive attenuation).

[0156] In this embodiment, according to the energy increase rate of each NVH performance analysis index at different mileages, the NVH performance attenuation analysis of vehicles at different mileages can be accurately performed, thereby effectively optimizing the relevant components of the vehicle and improving the NVH performance of the vehicle.

[0157] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0158] In one embodiment, a vehicle NVH performance attenuation analysis device is provided, and the vehicle NVH performance attenuation analysis device corresponds one-to-one to the vehicle NVH performance attenuation analysis method in the above embodiment. Figure 5 As shown, the vehicle NVH performance attenuation analysis device includes an acquisition module 501, a determination module 502 and an analysis module 503. The detailed description of each functional module is as follows:

[0159] An acquisition module 501 is used to acquire NVH performance test data of the vehicle at different mileages, where the NVH performance test data includes noise data and vibration data of different measuring points on the vehicle under different working conditions;

[0160] A determination module 502 is used to determine noise energy increment data and vibration energy increment data of the vehicle at different mileages according to NVH performance test data of the vehicle at different mileages;

[0161] The analysis module 503 is used to analyze the NVH performance attenuation of the vehicle according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages.

[0162] Furthermore, the analysis module 503 is specifically used for:

[0163] The noise responses of the noise measuring points on the vehicle under different working conditions are used as multiple noise indices, and the vibration responses of the vibration measuring points on the vehicle under different working conditions are used as multiple vibration indices;

[0164] Determine the attenuation amount of each noise index and the attenuation amount of each vibration index at different mileages in the noise energy increment data and the vibration energy increment data of the vehicle at different mileages;

[0165] According to the attenuation of each noise index and the attenuation of each vibration index at different mileages, the noise index or vibration index with the fastest attenuation of the vehicle at the same mileage is determined.

[0166] Furthermore, the analysis module 503 is also specifically used for:

[0167] Determine the noise energy increment of each noise measuring point under different working conditions at the same mileage as the attenuation of each noise index at the same mileage;

[0168] The vibration energy increment of each vibration measuring point under different working conditions at the same mileage is determined as the attenuation of each vibration index at the same mileage, so as to obtain the attenuation of each vibration index at different mileages.

[0169] Further, the determination module 502 is specifically used for:

[0170] According to the noise data of different measuring points on the vehicle under different working conditions, the noise energy of the noise measuring points under different working conditions is determined to obtain the noise energy data of the vehicle at different mileages;

[0171] According to the vibration data of the vibration measuring points on the vehicle under different working conditions, the vibration energy of the vibration measuring points on the vehicle under different working conditions is determined to obtain the vibration energy data of the vehicle at different mileages;

[0172] Noise energy increment data and vibration energy increment data of the vehicle at different mileages are determined according to the noise energy data and vibration energy data of the vehicle at different mileages.

[0173] Furthermore, the determination module 502 is further specifically configured to:

[0174] Determine the noise energy data and the vibration energy data of the vehicle at an initial mileage, and determine the noise energy data and the vibration energy data of the vehicle at each high mileage;

[0175] Determine the incremental percentage of the noise energy of the vehicle at each high mileage relative to the initial mileage, and obtain the noise energy incremental data of the vehicle at different mileages;

[0176] The incremental percentage of the vibration energy of the vehicle at each high mileage relative to the initial mileage is determined to obtain the vibration energy incremental data of the vehicle at different mileages.

[0177] Furthermore, the determination module 502 is further specifically configured to calculate the noise energy of the noise measurement point under different working conditions by using the following formula:

[0178]

[0179] Among them, I is the noise energy of the noise measuring point under a certain working condition, p is the noise sound pressure of the noise measuring point under a certain working condition, ρ is the air density; c is the speed of sound.

[0180] Furthermore, the determination module 502 is specifically used to calculate the vibration energy of the vibration measurement point under different working conditions by using the following formula:

[0181]

[0182] Where E is the vibration energy of the vibration measuring point under a certain working condition, a rss It is the vibration acceleration of the vibration measuring point under a certain working condition.

[0183] For the specific definition of the vehicle NVH performance attenuation analysis device, please refer to the definition of the vehicle NVH performance attenuation analysis method above, which will not be repeated here. Each module in the above-mentioned vehicle NVH performance attenuation analysis device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0184] In one embodiment, a vehicle NVH performance attenuation analysis device is provided, and the computer device includes a processor, a memory, a network interface, a display screen, and an input device connected via a system bus. The processor of the vehicle NVH performance attenuation analysis device is used to provide computing and control capabilities. The memory of the vehicle NVH performance attenuation analysis device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the vehicle NVH performance attenuation analysis device is used to communicate with the vehicle via a network connection. When the computer program is executed by the processor, a vehicle NVH performance attenuation analysis method is implemented.

[0185] In one embodiment, Figure 6As shown, a vehicle NVH performance degradation analysis device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned vehicle NVH performance degradation analysis method are implemented.

[0186] In one embodiment, a readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned vehicle NVH performance attenuation analysis method are implemented.

[0187] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing related hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory.

[0188] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0189] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A vehicle NVH performance attenuation analysis method, characterized in that: include: Acquire NVH performance test data of the vehicle at different mileages, wherein the NVH performance test data includes noise data and vibration data of different measuring points on the vehicle under different working conditions; Determining noise energy increment data and vibration energy increment data of the vehicle at different mileages according to NVH performance test data of the vehicle at different mileages; Analyzing the NVH performance attenuation of the vehicle according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages; The analyzing the NVH performance attenuation of the vehicle according to the noise energy increment data and the vibration energy increment data of the vehicle at different mileages includes: Using the noise responses of the noise measuring points on the vehicle under different working conditions as multiple noise indices, and using the vibration responses of the vibration measuring points on the vehicle under different working conditions as multiple vibration indices; Determine the attenuation amount of each noise index and the attenuation amount of each vibration index at different mileages in the noise energy increment data and the vibration energy increment data of the vehicle at different mileages; According to the attenuation amounts of the noise indices and the attenuation amounts of the vibration indices at the different mileages, the noise indices or the vibration indices with the fastest attenuation at the same mileage of the vehicle are determined.

2. The vehicle NVH performance attenuation analysis method according to claim 1, characterized in that: Determining the attenuation amount of each noise index and the attenuation amount of each vibration index at different mileages from the noise energy increment data and the vibration energy increment data at different mileages of the vehicle includes: Determine the noise energy increment of each noise measuring point under different working conditions at the same mileage as the attenuation of each noise index at the same mileage; The vibration energy increment of each vibration measuring point under different working conditions at the same mileage is determined as the attenuation amount of each vibration index at the same mileage, so as to obtain the attenuation amount of each vibration index at the different mileages.

3. The vehicle NVH performance attenuation analysis method according to claim 1, characterized in that: Determining the noise energy increment data and the vibration energy increment data of the vehicle at different mileages according to the NVH performance test data of the vehicle at different mileages includes: Determine the noise energy of the noise measuring points under different working conditions according to the noise data of different measuring points on the vehicle under different working conditions, so as to obtain the noise energy data of the vehicle at different mileages; Determine the vibration energy of the vibration measuring point on the vehicle under different working conditions according to the vibration data of the vibration measuring point on the vehicle under different working conditions, so as to obtain the vibration energy data of the vehicle at different mileages; Noise energy increment data and vibration energy increment data of the vehicle at different mileages are determined according to the noise energy data and vibration energy data of the vehicle at different mileages.

4. The vehicle NVH performance attenuation analysis method according to claim 3, characterized in that: Determining the noise energy increment data and the vibration energy increment data of the vehicle at different mileages according to the noise energy data and the vibration energy data of the vehicle at different mileages includes: Determining noise energy data and vibration energy data of the vehicle at an initial mileage, and determining noise energy data and vibration energy data of the vehicle at each high mileage; Determining the incremental percentage of the noise energy of the vehicle at each high mileage relative to the initial mileage, and obtaining noise energy incremental data of the vehicle at different mileages; The incremental percentage of the vibration energy of the vehicle at each high mileage relative to the initial mileage is determined to obtain vibration energy incremental data of the vehicle at different mileages.

5. The vehicle NVH performance attenuation analysis method according to claim 3, characterized in that: The noise energy of the noise measurement point under different working conditions is calculated by the following formula: ； in, is the noise energy of the noise measurement point under a certain working condition, is the noise pressure at the noise measuring point under a certain working condition, is the air density; is the speed of sound.

6. The vehicle NVH performance attenuation analysis method according to claim 3, characterized in that: The vibration energy of the vibration measuring point under different working conditions is calculated by the following formula: ； in, is the vibration energy of the vibration measuring point under a certain working condition, It is the vibration acceleration of the vibration measuring point under a certain working condition.

7. The vehicle NVH performance attenuation analysis method according to any one of claims 1 to 6, characterized in that: The NVH performance test data of the vehicle at different mileages is obtained in the following way: a. Perform NVH performance tests on the vehicle in its initial factory state under different working conditions, and obtain noise data of each noise measuring point on the vehicle under different working conditions and vibration data of each vibration measuring point under different working conditions as the noise data and vibration data of the vehicle at the initial mileage; b. Determine a preset mileage, and conduct a road test on the vehicle so that the actual mileage of the vehicle is the preset mileage; c. After the road test, the NVH performance test is performed on the vehicle under different working conditions to obtain the noise data of each noise measuring point on the vehicle under different working conditions and the vibration data of each vibration measuring point under different working conditions as the noise data and vibration data of the vehicle at a preset mileage; d. Change the preset mileage and repeat steps b to c until all the preset mileages are traversed to obtain the noise data and vibration data of the vehicle at different mileages.

8. A vehicle NVH performance attenuation analysis device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the vehicle NVH performance attenuation analysis method according to any one of claims 1 to 7 are implemented.

9. A readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the vehicle NVH performance attenuation analysis method according to any one of claims 1 to 7 are implemented.

Images