A noise simulation test method, device and electronic equipment of a vehicle

Abstract

The application relates to a noise simulation test method and device of a vehicle and electronic equipment, relates to the technical field of vehicles, in particular to the technical field of simulation tests, and comprises the following steps: obtaining sound power level data of bench test of an electric drive system to be tested; constructing a noise simulation model of a target vehicle, determining an electric drive noise excitation source in the noise simulation model based on the sound power level data; performing noise simulation test based on the noise simulation model to obtain a noise simulation test result. The noise excitation source inside the electric drive shell is determined based on the bench test result, the actual excitation of the electric drive under different working conditions of the vehicle can be better reflected, and the accuracy of the noise simulation result is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to the technical field of simulation testing, and specifically to a noise simulation testing method and device for a vehicle and an electronic device. BACKGROUND

[0002] With the increasing market share of electric vehicles, the noise, vibration and harshness (NVH) problems of electric vehicles are increasingly prominent and have attracted much attention. NVH performance is one of the important indicators for consumers to evaluate vehicles. Good NVH performance can enhance the seniority and quality image of the vehicle, and otherwise the consumers will feel that the quality of the vehicle is not good.

[0003] Among them, the electric drive howling is a common phenomenon in the NVH problem of electric vehicles, which refers to the high-frequency noise generated by the electric motor when it is running in the electric vehicle or electric motor drive system. Electric drive howling is a complex problem that may involve electromagnetic, mechanical, control and other aspects. Electromagnetic noise, mechanical resonance, gears or bearings, controllers and software, etc. may cause electric drive howling. To solve this problem, the motor design, control system, mechanical structure and other factors need to be considered comprehensively, and the best solution is found through experiments and debugging.

[0004] How to accurately and efficiently predict the noise level of the head of the driver and passenger under a specific electric drive order has become a technical problem to be solved. SUMMARY

[0005] The present application provides a noise simulation testing method and device for a vehicle and an electronic device to improve the accuracy of noise simulation results.

[0006] According to the first aspect of the present application, a noise simulation testing method for a vehicle is provided, the method comprising:

[0007] Obtaining sound power level data of bench testing of the electric drive system to be tested;

[0008] Constructing a noise simulation model of the target vehicle, and determining an electric drive noise excitation source in the noise simulation model based on the sound power level data;

[0009] Performing noise simulation testing based on the noise simulation model to obtain noise simulation testing results.

[0010] It can be seen that, by applying the embodiment of the present application, the sound power level data of the bench test of the to-be-tested electric drive system is obtained; the noise simulation model of the target vehicle is constructed, the electric drive noise excitation source in the noise simulation model is determined based on the sound power level data; the noise simulation test is performed based on the noise simulation model, and the noise simulation test result is obtained. The sound power level data of the to-be-tested electric drive system is obtained through the bench test, and the sound power level data can reflect the sound emission capability of the sound source itself, so that the electric drive noise excitation source in the noise simulation model is determined based on the sound power level data, without the need to model the inside of the electric drive shell. Moreover, compared with the way of modeling the inside of the electric drive shell by considering the vibration response of the electric drive structure under the action of electromagnetic force and gear force, the noise excitation source in the inside of the electric drive shell is determined based on the bench test result, which can more reflect the actual excitation of the electric drive of the vehicle under different working conditions, and thus improve the accuracy of the noise simulation result.

[0011] In a possible manner, the sound power level data of the bench test of the to-be-tested electric drive system is obtained, including:

[0012] The sound pressure level test data of the bench test of the to-be-tested electric drive system is obtained.

[0013] The sound pressure level test data is converted into sound power level data.

[0014] It can be seen that, by applying the embodiment of the present application, the sound pressure level test data of the bench test of the to-be-tested electric drive system is obtained, and then the sound pressure level test data is converted into sound power level data according to the correlation between the sound pressure level and the sound power level. The sound power level data can reflect the sound emission capability of the sound source itself, so that the electric drive noise excitation source in the noise simulation model is determined based on the sound power level data, without the need to model the inside of the electric drive shell. Moreover, the noise excitation source in the inside of the electric drive shell is determined based on the bench test result, which can more reflect the actual excitation of the electric drive of the vehicle under different working conditions, and thus improve the accuracy of the noise simulation result.

[0015] In a possible manner, the sound power level data of the bench test of the to-be-tested electric drive system is obtained, including:

[0016] The target electric drive order of the noise simulation test is determined.

[0017] The sound pressure level data of the bench test corresponding to the target electric drive order is obtained.

[0018] The sound pressure level data of a preset octave of a target frequency band is obtained by frequency band division and energy allocation on the sound pressure level data.

[0019] The sound power level data of a preset octaves of a target frequency band corresponding to the target electric drive order is obtained by converting the sound pressure level data of a preset octaves of a target frequency band.

[0020] It can be seen that, by applying the embodiment scheme, noise simulation tests can be performed for specific electric drive orders, after the target electric drive order is determined, bench tests are performed for the target electric drive order, corresponding sound pressure level data is obtained, the total sound pressure level data is divided into sound pressure level data of a preset octave band, that is, is allocated to multiple frequency bands, and then the sound pressure level data of each frequency band is converted into sound power level data. Thus, in the noise simulation test process, it is convenient to analyze the energy distribution of noise in each frequency band.

[0021] In a possible manner, the noise simulation model includes an electric drive simulation subsystem; the electric drive simulation subsystem includes an electric drive shell system, an inner acoustic cavity, and an outer acoustic cavity.

[0022] Based on the sound power level data, an electric drive noise excitation source in the noise simulation model is determined, including:

[0023] The sound power level data is applied to the inner acoustic cavity in the electric drive simulation subsystem.

[0024] It can be seen that, by applying the embodiment scheme, the electric drive simulation subsystem is simply modeled, only including the electric drive shell system, the inner acoustic cavity, and the outer acoustic cavity. When performing noise simulation, the sound power level data converted based on the bench test data is applied to the inner acoustic cavity of the electric drive simulation subsystem. The sound power level data can reflect the sound emission capability of the sound source itself, which is equivalent to providing the noise excitation source of the electric drive system. It is not necessary to model the inside of the electric drive shell based on the vibration response of the electric drive structure under the action of electromagnetic force and gear force, which simplifies the modeling of the electric drive simulation subsystem, and determines the noise excitation source inside the electric drive shell based on the bench test results, which can better reflect the actual excitation of the electric drive of the vehicle under different working conditions, and thus improve the accuracy of the noise simulation results.

[0025] In a possible manner, noise simulation tests are performed based on the noise simulation model, and noise simulation test results are obtained, including:

[0026] In the case that a simulation electric drive package is set in the noise simulation model, the noise simulation model is run to determine first sound pressure level data of a target region;

[0027] In the case that a simulation electric drive package is not set in the noise simulation model, the noise simulation model is run to determine second sound pressure level data of the target region;

[0028] According to the first sound pressure level data and the second sound pressure level data, a noise reduction index of the simulation electric drive package is determined; the noise reduction index represents a sound pressure level reduction.

[0029] It can be seen that, by applying the embodiment scheme of the present application, the electric drive package can be modeled, noise simulation is performed in the case of setting the simulation electric drive package and not setting the simulation electric drive package, sound pressure level data of a specific area is obtained, which is used to represent the noise level perceived by the passenger. Then, the noise reduction performance of the electric drive package is evaluated according to the sound pressure level reduction, and a simple and fast way of evaluating the noise reduction performance of the electric drive package is provided.

[0030] In a possible manner, the transmission loss parameter of the simulation electric drive package in the noise simulation model is determined based on package data of the simulation electric drive package, and the package data includes at least one of material, thickness, and actual package rate.

[0031] In a possible manner, the method further includes:

[0032] According to the sound pressure level reduction and the cost of each simulation electric drive package, the cost performance and / or the cost weight ratio of each simulation electric drive package is calculated.

[0033] It can be seen that, by applying the embodiment scheme of the present application, the actual cost of the electric drive package can be further considered, the cost performance and / or the cost weight ratio of the simulation electric drive package is calculated, and a suitable electric drive package is selected according to the project requirements.

[0034] According to the second aspect provided by the present application, a noise simulation test device of a vehicle is provided, and the device includes:

[0035] The acquisition module is configured to acquire sound power level data of bench test of the electric drive system to be tested;

[0036] The determination module is configured to construct a noise simulation model of the target vehicle, and determine an electric drive noise excitation source in the noise simulation model based on the sound power level data.

[0037] The simulation module is configured to perform noise simulation test based on the noise simulation model, and obtain noise simulation test results.

[0038] It can be seen that, by applying the embodiment of the present application, the sound power level data of the bench test of the electric drive system to be tested is acquired, the noise simulation model of the target vehicle is constructed, the electric drive noise excitation source in the noise simulation model is determined based on the sound power level data, and the noise simulation test is performed based on the noise simulation model to obtain the noise simulation test results. The sound power level data of the bench test of the electric drive system to be tested is acquired, the sound power level data can reflect the sound generation capacity of the sound source itself, and therefore the electric drive noise excitation source in the noise simulation model is determined based on the sound power level data, without the need to model the inside of the electric drive shell. Moreover, compared with the way of modeling the inside of the electric drive shell by considering the vibration response of the electric drive structure under the action of electromagnetic force and gear force, the noise excitation source in the inside of the electric drive shell is determined based on the bench test results, which can better reflect the actual excitation of the electric drive under different working conditions of the vehicle, and thus the accuracy of the noise simulation results is improved.

[0039] In a possible implementation, the obtaining module is specifically configured to:

[0040] obtain sound pressure level test data of bench testing of the to-be-tested electric drive system;

[0041] convert the sound pressure level test data into sound power level data.

[0042] In a possible implementation, the obtaining module is specifically configured to:

[0043] determine a target electric drive order of the noise simulation test;

[0044] obtain sound pressure level data of bench testing corresponding to the target electric drive order;

[0045] perform frequency band division and energy allocation on the sound pressure level data, to obtain sound pressure level data of a preset octave of a target frequency band;

[0046] convert the sound pressure level data of the preset octave of the target frequency band, to obtain sound power level data of the preset octave of the target frequency band corresponding to the target electric drive order.

[0047] In a possible implementation, the noise simulation model comprises an electric drive simulation subsystem; the electric drive simulation subsystem comprises an electric drive shell system, an inner acoustic cavity, and an outer acoustic cavity.

[0048] The determining module is specifically configured to: apply the sound power level data to the inner acoustic cavity in the electric drive simulation subsystem.

[0049] In a possible implementation, the simulation module is specifically configured to:

[0050] in a case where the noise simulation model is provided with a simulation electric drive package, run the noise simulation model to determine first sound pressure level data of the target region;

[0051] in a case where the noise simulation model is not provided with a simulation electric drive package, run the noise simulation model to determine second sound pressure level data of the target region;

[0052] determine a noise reduction index of the simulation electric drive package according to the first sound pressure level data and the second sound pressure level data; the noise reduction index represents a sound pressure level reduction amount.

[0053] In a possible implementation, a transmission loss parameter of the simulation electric drive package in the noise simulation model is determined based on package data of the simulation electric drive package, and the package data comprises at least one of the following: material, thickness, and actual package rate.

[0054] In a possible implementation, the apparatus further comprises a computing module configured to:

[0055] According to the sound pressure level reduction and the cost of each simulation electric drive package, the cost performance and / or the cost weight ratio of each simulation electric drive package are calculated.

[0056] According to a third aspect provided by the present application, an electronic device is provided, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the method of the first aspect and any possible implementation thereof.

[0057] According to a fourth aspect provided by the present application, a computer-readable storage medium is provided, when the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device can execute the method of the first aspect and any possible implementation thereof.

[0058] According to a fifth aspect provided by the present application, a computer program product is provided, the computer program product comprising computer instructions, when the computer instructions are run on the electronic device, the electronic device executes the method of the first aspect and any possible implementation thereof.

[0059] It should be noted that the technical effects brought by any implementation of the second aspect to the fifth aspect can refer to the technical effects brought by the corresponding implementation of the first aspect, which will not be repeated here.

[0060] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0061] The accompanying drawings, which are incorporated into and form part of the specification, illustrate an embodiment consistent with the present application and, together with the specification, serve to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0062] Figure 1 is a flowchart of a noise simulation test method of a vehicle according to an exemplary embodiment;

[0063] Figure 2 is a modeling schematic diagram of an electric drive shell system according to an exemplary embodiment;

[0064] Figure 3 is a flowchart of determining sound power level data according to an exemplary embodiment;

[0065] Figure 4 is a schematic diagram of a transmission loss parameter according to an exemplary embodiment;

[0066] Figure 5 is a schematic diagram of sound pressure level data according to an exemplary embodiment;

[0067] Figure 6 is a block diagram of a noise simulation test device of a vehicle according to an example embodiment;

[0068] Figure 7 is a block diagram of an electronic device according to an example embodiment. DETAILED DESCRIPTION

[0069] In order for those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0070] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described accompanying drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0071] In the embodiments of the present application, the words "exemplary", "such as", or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described as "exemplary", "such as", or "for example" in the embodiments of the present application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Rather, the use of "exemplary", "such as", or "for example" is intended to present relevant concepts in a concrete manner.

[0072] According to the division of the transmission path, the electric drive howling is divided into structural noise and air radiation noise, and the present application mainly studies the air radiation noise part of the electric drive howling.

[0073] For the study of electric drive howling, in the related art, it is difficult to accurately simulate the real situation of electric drive load under different orders, and the electric drive load is an important input index in noise simulation test, which directly affects the accuracy of noise simulation test. Therefore, the related art is difficult to accurately simulate the in-vehicle noise.

[0074] In order to solve the above technical problems, the present application provides a noise simulation test method and device for a vehicle and an electronic device.

[0075] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0076] In the embodiments of the present application, the vehicle can also be referred to as a vehicle, a mobile carrier, an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a fuel cell vehicle (FCV), an autonomous vehicle, an intelligent and connected vehicle (ICV), a driverless vehicle, etc.

[0077] In the embodiments of the present application, the vehicle can be a car, a sport utility vehicle (SUV), a truck, an electric vehicle, a motorcycle, a tricycle, a special vehicle (such as an ambulance, a fire truck, a police car, etc.), a driverless taxi, an intelligent and connected bus, an autonomous logistics vehicle, an electric truck, etc. In addition, the method is also applicable to various special vehicles, such as agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, port vehicles, etc. The present application does not make specific limitations in this regard.

[0078] For ease of understanding, the noise simulation test method of the vehicle provided in the present application is specifically introduced below in combination with the accompanying drawings. Referring to Figure 1 , the method can include the following steps:

[0079] S101: Obtain the sound power level data of the bench test of the to-be-tested electric drive system.

[0080] Bench test refers to an important method of simulating actual working conditions in a controllable laboratory environment to evaluate the noise of a mechanical system or component. During the test, the to-be-tested electric drive system is installed on a test bench and operated according to specific standards and procedures. The tester places a sound level meter at a specific location according to the test standards and requirements, and records the noise level of the electric drive system under different operating conditions.

[0081] In the embodiments of the present application, it can be performed in a power transmission system semi-anechoic chamber to reduce sound reflection and interference.

[0082] In the test execution phase, the test procedure is followed, the electric drive system to be tested is started and runs to a steady state. In this process, the operating parameters of the electric drive system to be tested can be adjusted to simulate different actual working conditions. During the operation of the electric drive system to be tested, the sound pressure level (SPL) data is collected using a sound level meter placed at a specific location.

[0083] In the bench test process, the directly collected data is sound pressure level data. The sound pressure level data represents the ratio of the effective value of the sound pressure at a certain point to the reference sound pressure when the sound propagates in the air. Its physical meaning is to reflect the actual intensity of the sound at a specific location.

[0084] In the embodiments of the present application, the electric drive noise excitation source in the noise simulation model of the target vehicle needs to be set according to the test results of the bench test of the electric drive system to be tested. As mentioned above, the sound pressure level data reflects the actual intensity of the sound emitted by the noise source at a specific location, and it cannot be used as the electric drive noise excitation source itself.

[0085] Therefore, in the embodiments of the present application, the sound pressure level test data is converted into sound power level (SWL) data. The sound power level data represents the total sound energy radiated by the sound source to the surrounding space per unit time, and the ratio of the reference power can be expressed in decibels (dB). Its physical meaning is to reflect the sound emission capacity of the sound source itself, which is an inherent attribute of the sound source and is independent of the test location and the test environment.

[0086] The sound power level is the total radiated sound energy of the sound source, and the sound pressure level is the local sound pressure at a specific location. Under the condition of a free field (no reflection, no interference), the two can be related through the spherical wave propagation formula.

[0087] In the embodiments of the present application, the electric drive system to be tested is bench tested to obtain sound pressure level test data, and the sound power level data of the electric drive system to be tested is inversely deduced from the sound pressure level test data, which is used as the actual noise excitation source. The related parameters are set in the noise simulation model for subsequent noise simulation tests.

[0088] S102: Construct a noise simulation model of a target vehicle, and determine an electric drive noise excitation source in the noise simulation model based on sound power level data.

[0089] In the embodiments of the present application, the constructed noise simulation model can be a statistical energy analysis (SEA) model. The SEA model is an acoustic-vibration analysis method based on statistical mechanics and wave theory, mainly used for predicting the vibration and noise response of complex systems at high frequencies. By dividing the system into multiple subsystems and analyzing the energy flow between the subsystems, the overall dynamic behavior is quickly estimated. The SEA model assumes that the system has high-frequency and random characteristics at high frequencies, and the response of the subsystem can be described by energy density, rather than precise displacement or velocity field. In the process of constructing the SEA model, the complex structure is divided into multiple subsystems that are coupled with each other, and each subsystem has independent modal density and energy.

[0090] In the embodiments of the present application, the noise simulation model of the target vehicle is an SEA model of the whole vehicle, which can specifically include multiple subsystems, such as an electric drive simulation subsystem, an electric drive wrapping subsystem, a vehicle body subsystem, etc.

[0091] In the embodiments of the present application, the electric drive simulation subsystem and the electric drive wrapping subsystem are focused on, and for other subsystems, the actual architecture of the target vehicle and the materials used for the corresponding components are set.

[0092] In the embodiments of the present application, for the electric drive simulation subsystem, the electric drive shell system and the inner sound cavity and the outer sound cavity are built through the electric drive shell data. For example, the inner sound cavity is 1 sound cavity, and the outer sound cavity is a total of 10 sound cavities, which can be built according to 5 sound cavities on the left and right respectively.

[0093] Referring to Figure 2 , Figure 2 is a modeling schematic diagram of an electric drive shell system according to an exemplary embodiment.

[0094] Among them, the inner sound cavity refers to the internal air space of the electric drive shell which is closed or partially closed by the structure, and the outer sound cavity refers to the sound field area formed by the sound waves radiated by the sound source in the external space. In the noise simulation test system, the inner sound cavity is the source of vibration noise, which can also be understood as a noise source.

[0095] In the traditional noise simulation test, the vibration response of the electric drive structure under the action of electromagnetic force and gear force is considered, and the inside of the electric drive shell is modeled. However, this modeling is difficult to reflect the actual excitation of the electric drive under different working conditions, thereby affecting the noise simulation test results.

[0096] In the embodiments of the present application, the sound power level data of the electric drive system to be tested is obtained through the bench test, and the sound power level data can reflect the sound emission capacity of the sound source itself, so it is not necessary to model the inside of the electric drive shell, and the sound source of the SEA model can be set by using the sound power level data obtained through the bench test.

[0097] Specifically, determining the electric drive noise excitation source in the noise simulation model based on the sound power level data includes: applying the sound power level data to the inner acoustic cavity in the electric drive simulation subsystem.

[0098] In the embodiments of the present application, noise simulation can be performed under different working conditions. The working condition is the working state or operating parameter of the vehicle under a specific condition. The working condition is related to the electric drive order, and the bench test can be performed for different electric drive orders to obtain the sound power level data under different electric drive orders.

[0099] The electric drive order is a core concept for analyzing the vibration and noise of an electric drive system (such as the motor of an electric vehicle), which refers to the multiple relationship between the frequency component of the vibration or noise signal and the rotor rotation frequency of the motor.

[0100] S103: Perform noise simulation test based on the noise simulation model to obtain noise simulation test results.

[0101] In the embodiments of the present application, after the SEA model of the whole vehicle is constructed and the electric drive noise excitation source in the SEA model is determined, the SEA model is run to obtain the noise simulation test results.

[0102] Specifically, the SEA model simulates the sound attenuation in the sound transmission process according to the acoustic characteristics of each subsystem to obtain the sound pressure level data at a specific position. For example, the specific position can be the area where the headrest of the driver and passenger of the target vehicle is located.

[0103] As can be seen, by applying the embodiments of the present application, the sound power level data of the bench test of the electric drive system to be tested is obtained, a noise simulation model of the target vehicle is constructed, the electric drive noise excitation source in the noise simulation model is determined based on the sound power level data, and noise simulation test is performed based on the noise simulation model to obtain noise simulation test results. The sound power level data of the bench test of the electric drive system to be tested is obtained, and the sound power level data can reflect the sound generation ability of the sound source itself. Therefore, the electric drive noise excitation source in the noise simulation model is determined based on the sound power level data, without the need to model the inside of the electric drive shell. Moreover, compared with the way of modeling the inside of the electric drive shell by considering the vibration response of the electric drive structure under the action of electromagnetic force and gear force, the noise excitation source inside the electric drive shell is determined based on the bench test results, which can better reflect the actual excitation of the electric drive under different working conditions of the vehicle, thereby improving the accuracy of the noise simulation results.

[0104] In some embodiments of the present application, during the bench test, the sound pressure level test data of the electric drive system to be tested is obtained, and then the sound pressure level test data is converted into sound power level data based on the spherical wave propagation formula.

[0105] The conversion process of converting the sound pressure level test data into sound power level data is exemplarily introduced below, including step 11-step 12.

[0106] Step 11: Obtain the sound pressure level test data of the bench test of the electric drive system to be tested.

[0107] Exemplarily, the bench test data of the electric drive system to be tested is obtained through experiments. For example, 1 meter sound pressure level test data.

[0108] Step 12: Convert the sound pressure level test data into sound power level data.

[0109] Exemplarily, the following formula is used to convert the 1 meter sound pressure level test data into first sound power level data:

[0110] .

[0111] wherein, represents the first sound power level data, represents the average sound pressure level test data, represents the spherical area corresponding to the distance of the electric drive system to be tested as the center to the sound pressure level test point as the radius, represents the logarithmic function.

[0112] In the case of placing the electric drive system bench test in a semi-anechoic chamber, the above formula becomes:

[0113] .

[0114] wherein, represents the distance from the sound test sensor to the electric drive system to be tested. For 1 meter sound pressure level test data, the value is 1.

[0115] Further, on the basis of the first sound power level data, the second sound power level data is obtained by correction.

[0116] In the bench test, the electric drive is placed in a spacious semi-anechoic chamber. While in the whole vehicle, the electric drive is placed in a narrow vehicle motor compartment. According to the sound propagation characteristic law, the sound propagation in the motor compartment satisfies the 1 / 4 radiation space theory, and the sound power increases by 6dB.

[0117] .

[0118] wherein, represents the second sound power level data, which can be used to set the electric drive noise excitation source in the noise simulation model.

[0119] As described above, the noise simulation test can be carried out for a specific electric drive order. Correspondingly, the sound power level data of the bench test of the electric drive system to be tested is obtained,Figure 3 is a flowchart for determining sound power level data according to an exemplary embodiment, and can specifically include the following steps:

[0120] S301: Determine the target electrical drive order of the noise simulation test.

[0121] The electrical drive order represents the multiple relationship between the frequency component of the vibration or noise signal and the rotation frequency of the motor rotor.

[0122] S302: Obtain the sound pressure level data of the bench test corresponding to the target electrical drive order.

[0123] In the case of a noise simulation test focusing on the target electrical drive order, the bench test is performed for the target electrical drive order to obtain the corresponding sound power level data.

[0124] S303: Perform frequency band division and energy allocation on the sound pressure level data to obtain the sound pressure level data of the target frequency band in the preset octave band.

[0125] In this step, the sound pressure level test data of the target electrical drive order is converted into the sound pressure level of the target frequency band in the preset octave band. The essence is to divide the sound pressure level energy of the target electrical drive order into multiple frequency bands.

[0126] In the field of noise reduction, the noise performance of 1 / 3 octave band in a specific frequency band is usually focused on, so the preset octave band is taken as an example.

[0127] Specifically, according to the division rule of 1 / 3 octave band, the target frequency band is divided into multiple frequency bands, and the ratio of the center frequency of each frequency band to the center frequency of the adjacent frequency band is For example, the target frequency band can be a frequency band of 200-8000 Hz.

[0128] According to the law of conservation of energy, the total sound pressure level of the target electrical drive order is equal to the energy superposition of the sound pressure level in the 1 / 3 octave band it covers. Further, for each frequency band obtained by division, an energy allocation method is used for allocation to obtain the allocation energy of each frequency band, which is then converted into the corresponding sound pressure level. The energy allocation method can include rectangular window allocation, Gaussian window allocation, etc., which is not limited by the embodiments of the present application.

[0129] S304: Convert the sound pressure level data of the target frequency band in the preset octave band to obtain the sound power level data of the target frequency band in the preset octave band corresponding to the target electrical drive order.

[0130] For each divided frequency band, the corresponding sound pressure level data is converted into sound power level data, which can obtain the sound power level data of the target frequency band in the preset octave band corresponding to the target electrical drive order. The specific conversion method can be referred to in the above, which will not be described here.

[0131] In the embodiments of the present application, the noise reduction performance of the electric drive package can be evaluated through noise simulation testing.

[0132] Specifically, when constructing a noise simulation model of the target vehicle, a simulation electric drive package can be set, and the levels, thicknesses, and materials of the simulation electric drive package can be set with reference to the actual electric drive package to be tested.

[0133] During the noise simulation testing, the transmission loss (TL) of the simulation electric drive package needs to be considered. TL is a parameter used to quantify the ability of an acoustic element to block sound energy in the field of acoustics.

[0134] In some embodiments of the present application, the transmission loss parameter of the simulation electric drive package in the noise simulation model can be determined according to the package data of the simulation electric drive package, wherein the package data includes at least one of the material, thickness, and actual package rate.

[0135] Specifically, since the electric drive is connected to the drive shaft, high-voltage wire harness, controller, and the like, it is difficult for the electric drive package material to achieve 100% coverage, which is equivalent to forming an acoustic leak. The actual package rate of the simulation electric drive package is determined according to the actual coverage.

[0136] For example, according to the material, thickness, and actual package rate of the package, the noise control treatment (NCT) of the electric drive package and the corresponding multiple noise control treatment (MNCT) of the electric drive package are calculated, and then the transmission loss parameter of the simulation electric drive package is calculated according to the NCT and / or MNCT.

[0137] In the embodiments of the present application, the noise reduction indicators of the simulation electric drive package can be tested during the noise simulation testing.

[0138] In some embodiments of the present application, the noise simulation testing is performed based on the noise simulation model to obtain a noise simulation testing result, which can specifically include: running the noise simulation model to determine the first sound pressure level data of the target area when the simulation electric drive package is set in the noise simulation model; running the noise simulation model to determine the second sound pressure level data of the target area when the simulation electric drive package is not set in the noise simulation model; determining the noise reduction indicators of the simulation electric drive package according to the first sound pressure level data and the second sound pressure level data; and the noise reduction indicators representing the sound pressure level reduction.

[0139] In actual project development, in order to facilitate the evaluation of an electric drive wrapping material, the sound pressure level curves of the head response of the driver and passenger at 1 / 3 octave frequency under the conditions of having and not having the electric drive wrapping are solved respectively, and the average sound pressure level is taken as an evaluation index by using normalization processing on the corresponding curves.

[0140] As an example, the average sound pressure level P is calculated in the following manner:

[0141] .

[0142] Wherein, n is the number of frequency bands decomposed according to 1 / 3 octave from 200 to 8000 Hz, and the center frequencies corresponding to the frequency bands are 200 Hz, 250 Hz, 315 Hz, 400 Hz, 500 Hz, 630 Hz, 800 Hz, 1000 Hz, 1250 Hz, 1600 Hz, 2000 Hz, 2500 Hz, 3150 Hz, 4000 Hz, 5000 Hz, 6300 Hz, and 8000 Hz. In the whole vehicle electric drive order simulation analysis, compared with the condition of not designing the electric drive wrapping, the average sound pressure level when the wrapping is designed will have a reduction, i.e. the sound pressure level reduction, and the greater the value, the better the noise reduction effect of the wrapping material on the electric drive.

[0143] In the embodiments of the present application, the cost of the electric drive wrapping material can also be considered, and the cost performance ratio and / or the performance weight ratio can be calculated in combination with the sound pressure level reduction. The cost can include weight and price.

[0144] Specifically, the weight and price cost of the electric drive wrapping material are calculated, the weight of the wrapped parts is calculated according to the electric drive wrapping material scheme and the designed thickness, and the total price of the electric drive wrapped parts is calculated according to the prices of different materials and the utilization rate of the materials in production.

[0145] Further, the electric drive wrapping material scheme can be determined according to the project requirements. For example, requirement one, according to the target of the head response of the driver and passenger, a wrapping scheme meeting the noise reduction performance is selected; requirement two, the performance weight ratio requirement, i.e. meeting the performance standard and also meeting the weight target requirement; requirement three, the performance cost ratio requirement, i.e. meeting the performance standard and also meeting the cost target requirement.

[0146] As a specific example, the design process of the electric drive wrapping of A vehicle is described as an example, which specifically includes the following steps:

[0147] (1) An SEA simulation model of A vehicle is built, including the electric drive system and the electric drive wrapping part.

[0148] Based on the whole vehicle SEA model, the electric drive shell data is used to build the electric drive shell subsystem, as well as the inner and outer acoustic cavity subsystems. In this example, two wrapping material schemes are compared to illustrate the optimization design method. Scheme one is 2mm POE + polyurethane foam, and scheme two is hard felt + PA film + polyurethane foam, for example, hard felt 1200g / m^2 + PA film 85g / m^2 + polyurethane foam. For details, see Table 1, where the polyurethane foam thickness and coverage of scheme one and two are the same. According to the electric drive wrapping data, different composition levels and thicknesses of different wrapping materials are obtained, and the noise control treatment parameters (NCT) corresponding to different thicknesses are obtained, as well as the multiple noise control treatment parameters (MNCT) corresponding to the electric drive wrapping.

[0149] Table 1

[0150]

[0151] Further, according to the MNCT of the electric drive wrapping, the TL is solved by the flat plate model, which can reflect the acoustic characteristics of the wrapping material, and the TL corresponding to scheme one and two is defined into the whole vehicle SEA model. The TL corresponding to scheme one and two is shown in Figure 4 Figure 4 The horizontal coordinate is frequency, and the vertical coordinate is TL parameter.

[0152] (2) Convert the bench test data in the semi-anechoic chamber of the electric drive system of vehicle A into sound power level.

[0153] For example, the 26th order of the electric drive noise of vehicle A is focused on, and the 1-meter sound pressure level test data at each speed obtained by testing is analyzed to obtain the 1-meter sound pressure level corresponding to the 26th order. The frequency range corresponding to the electric drive operating speed is 1 / 3 octave under 250~5000Hz, and energy average and frequency average processing is performed to convert the sound pressure level under 1 / 3 octave at 250~5000Hz frequency. Further calculation obtains the sound power level of the electric drive 26th order under 1 / 3 octave frequency.

[0154] (3) Load the sound power level in step (2) to the inner acoustic cavity of the rear electric drive to predict the sound pressure level of the front or rear passenger's head in the vehicle under 1 / 3 octave frequency. The sound pressure levels corresponding to wrapping scheme one, wrapping scheme two and electric drive without wrapping are shown in Figure 5 Figure 5 The horizontal coordinate is frequency, and the vertical coordinate is sound pressure level.

[0155] (4) Calculate the weight, cost, weight ratio and cost ratio of the electric drive wrapping material, as shown in Table 2:​​

[0156] Table 2

[0157]

[0158] According to the actual needs of the project, the following conclusions can be drawn from the above table: if the performance improvement is concerned, scheme one is selected; if lightweight is concerned, scheme two is selected; if cost performance is concerned, under the condition of electric drive package coverage, the cost performance of scheme one and two is equivalent.

[0159] The above mainly introduces the scheme provided by the embodiments of the present application from the method aspect. In order to realize the above functions, the noise simulation test device or electronic equipment of the vehicle contains the hardware structure and / or software module corresponding to the execution of each function. The skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed in the present text, the present application can be realized in the form of hardware or the combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driven hardware depends on the specific application and design constraints of the technical solution. The skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0160] The embodiments of the present application can divide the functional modules according to the above method, for example, the noise simulation test device or electronic equipment of the vehicle can include each functional module corresponding to each function division, or two or more functions can be integrated in one processing module. The above integrated module can be realized in the form of hardware or software functional module. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division. Actual implementation can have another division method.

[0161] Figure 6 is a block diagram of a noise simulation test device of a vehicle according to an exemplary embodiment. Referring to Figure 6 , the device comprises:

[0162] The acquisition module 601 is configured to acquire sound power level data of bench test of the electric drive system to be tested.

[0163] The determination module 602 is configured to construct a noise simulation model of the target vehicle, and determine an electric drive noise excitation source in the noise simulation model based on the sound power level data.

[0164] The simulation module 603 is configured to perform noise simulation test based on the noise simulation model, and obtain a noise simulation test result.

[0165] In a possible implementation, the acquisition module 601 is specifically configured to:

[0166] acquire sound pressure level test data of bench testing of the to-be-tested electric drive system;

[0167] convert the sound pressure level test data into the sound power level data.

[0168] In a possible implementation, the acquisition module 601 is specifically configured to:

[0169] determine a target electric drive order of a noise simulation test;

[0170] acquire sound pressure level data of bench testing corresponding to the target electric drive order;

[0171] perform frequency band division and energy allocation on the sound pressure level data to obtain sound pressure level data of a preset octave band of a target frequency band;

[0172] convert the sound pressure level data of the preset octave band of the target frequency band to obtain sound power level data of the preset octave band of the target frequency band corresponding to the target electric drive order.

[0173] In a possible implementation, the noise simulation model includes an electric drive simulation subsystem; the electric drive simulation subsystem includes an electric drive shell system, an inner acoustic cavity, and an outer acoustic cavity.

[0174] The determination module 602 is specifically configured to: apply the second sound power level data to the inner acoustic cavity in the electric drive simulation subsystem.

[0175] In a possible implementation, the simulation module 603 is specifically configured to:

[0176] in a case where the noise simulation model is provided with a simulation electric drive package, run the noise simulation model to determine first sound pressure level data of a target region;

[0177] in a case where the noise simulation model is not provided with the simulation electric drive package, run the noise simulation model to determine second sound pressure level data of the target region;

[0178] determine a noise reduction index of the simulation electric drive package according to the first sound pressure level data and the second sound pressure level data; the noise reduction index represents a sound pressure level reduction amount.

[0179] In a possible implementation, a transmission loss parameter of the simulation electric drive package in the noise simulation model is determined based on package data of the simulation electric drive package, and the package data includes at least one of the following: material, thickness, and actual package rate.

[0180] In a possible implementation, the apparatus further includes a calculation module configured to:

[0181] According to the sound pressure level reduction and the cost of each of the simulation electric drive packages, a performance-price ratio and / or a performance-weight ratio of each of the simulation electric drive packages is calculated.

[0182] Figure 7 is a block diagram of an electronic device according to an example embodiment. As shown in Figure 7 , the electronic device includes, but is not limited to, a processor 701 and a memory 702.

[0183] The memory 702 is configured to store executable instructions of the processor 701. It can be understood that the processor 701 is configured to execute the instructions to implement the noise simulation test method of the vehicle in the above embodiment.

[0184] It should be noted that those skilled in the art can understand that the electronic device structure shown in Figure 7 does not constitute a limitation on the electronic device, and the electronic device can include more or fewer components than Figure 7 shown, or combine certain components, or different component arrangements.

[0185] The processor 701 is the control center of the electronic device, and connects all parts of the electronic device through various interfaces and lines. The processor 701 executes software programs and / or modules stored in the memory 702 and calls data stored in the memory 702 to perform various functions of the electronic device and process data, thereby overall monitoring the electronic device. The processor 701 can include one or more processing units. Optionally, the processor 701 can integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the modem processor can also not be integrated into the processor 701.

[0186] The memory 702 can be used to store software programs and various data. The memory 702 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs (such as determining units, processing units, etc.) required by at least one function module, etc. In addition, the memory 702 can include a high-speed random access memory, and can also include a non-volatile memory, for example, at least one magnetic disk storage device, a flash memory device or other volatile solid-state memory device.

[0187] In the example embodiment, a computer readable storage medium including instructions is also provided, for example, the memory 702 including instructions, and the instructions can be executed by the processor 701 of the electronic device to implement the method in the above embodiment.

[0188] Optionally, the computer readable storage medium can be a non-transitory computer readable storage medium, for example, the non-transitory computer readable storage medium can be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic tape, a floppy disk and an optical data storage device, etc.

[0189] In the example embodiments, the embodiments of the present application also provide a computer program product comprising one or more instructions executable by a processor of an electronic device to complete the method in the above embodiments.

[0190] It should be noted that the instructions in the above computer readable storage medium or the one or more instructions in the computer program product are executed by the processor of the electronic device to realize each process of the above method embodiments, and can achieve the same technical effects as the above method. To avoid repetition, it will not be repeated here.

[0191] Through the description of the above embodiments, those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above division of each functional module is taken as an example for illustration, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0192] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed each other can be through some interface, indirect coupling or communication connection between devices or units, which can be electrical, mechanical or other forms.

[0193] The units described as separate components can or can not be physically separate, and the components shown as units can be one physical unit or multiple physical units, that is, can be located in one place, or can be distributed to multiple different places. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment scheme.

[0194] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0195] When the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application essentially or the parts that make contributions to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The software product is stored in a storage medium, including a plurality of instructions for causing an apparatus (which can be a single-chip microcomputer, a chip, etc.) or a processor to perform all or part of the steps of the method of each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media that can store program codes.

[0196] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A noise simulation test method for a vehicle, characterized by, The method comprises: acquiring sound power level data of bench test of an electric drive system to be tested; constructing a noise simulation model of a target vehicle, and determining an electric drive noise excitation source in the noise simulation model based on the sound power level data; performing noise simulation test based on the noise simulation model to obtain noise simulation test results; The acquisition of the sound power level data of the bench test of the electric drive system to be tested comprises: determining a target electric drive order; acquiring sound pressure level data of the bench test corresponding to the target electric drive order; performing frequency band division and energy allocation on the sound pressure level data to obtain sound pressure level data of a preset octave of a target frequency band; and converting the sound pressure level data of the preset octave of the target frequency band to obtain sound power level data of the preset octave of the target frequency band corresponding to the target electric drive order; the conversion of the sound pressure level data of the preset octave of the target frequency band comprises: converting the sound pressure level data to first sound power level data for the preset octave of the target frequency band, and correcting the first sound power level data based on sound propagation characteristics in a vehicle motor compartment to obtain second sound power level data; The noise simulation model comprises an electric drive simulation subsystem; the electric drive simulation subsystem comprises an electric drive shell system, an inner acoustic cavity and an outer acoustic cavity; the determination of the electric drive noise excitation source in the noise simulation model based on the sound power level data comprises: applying the second sound power level data to the inner acoustic cavity in the electric drive simulation subsystem.

2. The noise simulation test method of a vehicle according to claim 1, characterized by, The noise simulation test based on the noise simulation model to obtain noise simulation test results comprises: in the case where the noise simulation model is provided with a simulation electric drive package, running the noise simulation model to determine first sound pressure level data of a target area; in the case where the noise simulation model is not provided with the simulation electric drive package, running the noise simulation model to determine second sound pressure level data of the target area; determining a noise reduction index of the simulation electric drive package according to the first sound pressure level data and the second sound pressure level data; the noise reduction index represents a sound pressure level reduction amount.

3. The noise simulation test method of a vehicle according to claim 2, characterized by, The transmission loss parameter of the simulation electric drive package in the noise simulation model is determined based on package data of the simulation electric drive package, and the package data comprises at least one of material, thickness and actual package rate.

4. The noise simulation test method of a vehicle according to claim 2, characterized by, The method further comprises: calculating a cost performance ratio and / or a cost weight ratio of each simulation electric drive package according to the sound pressure level reduction amount and the cost of each simulation electric drive package.

5. A noise simulation testing device for a vehicle, characterized by, The device comprises: an acquisition module configured to acquire sound power level data of bench test of an electric drive system to be tested; a determination module configured to construct a noise simulation model of a target vehicle, and determine an electric drive noise excitation source in the noise simulation model based on the sound power level data; a simulation module configured to perform noise simulation test based on the noise simulation model to obtain noise simulation test results; The acquisition module is specifically configured to: determine a target electric drive order of a noise simulation test; acquire sound pressure level data of a bench test corresponding to the target electric drive order; perform frequency band division and energy allocation on the sound pressure level data to obtain sound pressure level data of a preset octave band of a target frequency band; convert the sound pressure level data of the preset octave band of the target frequency band to obtain sound power level data of the preset octave band of the target frequency band corresponding to the target electric drive order; and the conversion of the sound pressure level data of the preset octave band of the target frequency band comprises: converting the sound pressure level data to first sound power level data for the preset octave band of the target frequency band, and correcting the first sound power level data based on sound propagation characteristics in a vehicle motor compartment to obtain second sound power level data. The noise simulation model comprises an electric drive simulation subsystem; the electric drive simulation subsystem comprises an electric drive shell system, an inner acoustic cavity and an outer acoustic cavity; and the determination module is specifically configured to: apply the second sound power level data to the inner acoustic cavity in the electric drive simulation subsystem.

6. An electronic device, comprising: comprise: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the noise simulation test method of the vehicle according to any one of claims 1-4.

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