CN113959734A - Method, device, medium and equipment for separating noise source in vehicle - Google Patents
Method, device, medium and equipment for separating noise source in vehicle Download PDFInfo
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Abstract
The embodiment of the application discloses a method, a device, a medium and equipment for separating a noise source in a vehicle. The method comprises the following steps: acquiring comprehensive sound energy obtained by driving a vehicle at a calibrated speed in a finished vehicle road test; acquiring the noise energy of a single power system of a vehicle at a calibrated speed in a low-noise transmission system test bed; acquiring single wind noise energy of a vehicle at a calibrated speed in an acoustic wind tunnel test bed; determining the power system noise energy weight in the vehicle at the calibrated speed according to the single power system noise energy and the comprehensive noise energy; determining the weight of wind noise energy in the vehicle at a calibrated speed according to the single wind noise energy and the comprehensive sound energy; and determining the road noise energy weight in the vehicle at the calibrated speed according to the power system noise energy weight and the wind noise energy weight. The technical scheme can accurately quantify the energy weight ratio of each noise source, guide forward development of NVH performance and improve the riding comfort of users.
Description
Technical Field
The embodiment of the application relates to the technical field of automobiles, in particular to a method, a device, a medium and equipment for separating an in-car noise source.
Background
With the development of the automobile market and the improvement of the living standard of people, an important consideration standard when a user purchases an automobile is the quality of the NVH (Noise, Vibration, Harshness) performance of the automobile, and the quality of the performance directly influences the riding comfort of the user. Generally, in a running state of an automobile, noise sources in the automobile mainly come from power system (including an engine, an air inlet and an air outlet and a transmission system), wind noise and road noise.
Therefore, how to accurately separate the noise plays a decisive role in noise suppression of the automobile and brings important influence on the riding feeling of the user is also a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the application provides a method, a device, a medium and equipment for separating an in-vehicle noise source, which can accurately quantize the in-vehicle noise source and guide forward development of NVH (noise, vibration and harshness) performance, and further improve riding comfort of a user.
In a first aspect, an embodiment of the present application provides a method for separating an in-vehicle noise source, where the method includes: acquiring comprehensive sound energy obtained by driving a vehicle at a calibrated speed in a finished vehicle road test; wherein the comprehensive sound energy comprises power system noise energy, wind noise energy and road noise energy;
acquiring the noise energy of a single power system of a vehicle at a calibrated speed in a low-noise transmission system test bed; acquiring single wind noise energy of the vehicle at a calibrated speed in the acoustic wind tunnel test bed;
determining the power system noise energy weight in the vehicle at the calibrated speed according to the single power system noise energy and the comprehensive noise energy; determining the weight of wind noise energy in the vehicle at a calibrated speed according to the single wind noise energy and the comprehensive sound energy; and determining the road noise energy weight in the vehicle at the calibrated speed according to the power system noise energy weight and the wind noise energy weight.
In a second aspect, an embodiment of the present application provides a device for separating an in-vehicle noise source, where the device includes:
the comprehensive sound energy acquisition module is used for acquiring comprehensive sound energy obtained by driving a vehicle at a calibrated speed in a finished vehicle road test; wherein the comprehensive sound energy comprises power system noise energy, wind noise energy and road noise energy;
the single sound energy acquisition module is used for acquiring the single power system noise energy of the vehicle at the calibrated speed in the low-noise transmission system test bed; acquiring single wind noise energy of the vehicle at a calibrated speed in the acoustic wind tunnel test bed;
the weight determining module is used for determining the weight of the noise energy of the power system in the vehicle at the calibrated speed according to the noise energy of the single power system and the comprehensive noise energy; determining the weight of wind noise energy in the vehicle at a calibrated speed according to the single wind noise energy and the comprehensive sound energy; and determining the road noise energy weight in the vehicle at the calibrated speed according to the power system noise energy weight and the wind noise energy weight.
In a third aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the method for separating an in-vehicle noise source according to the present application is implemented.
In a fourth aspect, an embodiment of the present application provides an electronic device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method for separating an in-vehicle noise source according to the embodiment of the present application.
According to the technical scheme, the energy weight of the noise source can be obtained and accurately quantified and forward development of NVH performance is carried out by designing the test scheme based on the sound energy superposition principle, the main noise source is determined, in-vehicle noise target definition and decomposition are guided, the optimization scheme is made in a targeted mode to ensure that the NVH performance reaches the standard, and the riding comfort of a user is improved.
Drawings
FIG. 1 is a flowchart of a method for separating an in-vehicle noise source according to an embodiment of the present application;
fig. 2 is a block diagram of a structure of a device for separating an in-vehicle noise source according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus according to a fourth embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example one
Fig. 1 is a flowchart of a method for separating an in-vehicle noise source according to an embodiment of the present disclosure, where the method is applicable to a scenario where NVH performance is optimized in a vehicle, and the method may be executed by an apparatus for separating an in-vehicle noise source according to an embodiment of the present disclosure, where the apparatus may be implemented by software and/or hardware, and may be integrated in an electronic device.
As shown in fig. 1, the method for separating the noise source in the vehicle includes:
s110, acquiring comprehensive sound energy obtained by driving a vehicle at a calibrated speed in a finished vehicle road test; wherein the comprehensive sound energy comprises power system noise energy, wind noise energy and road noise energy.
The whole vehicle road test can be that a test vehicle tests in an actual road. The roads can be ordinary urban roads, expressways and the like. For example, the comprehensive sound energy E of the noise source in the vehicle under the vehicle running condition can be obtained by testing that the vehicle runs for a certain distance at a constant speedx. The integrated acoustic energy ExIncluding power system noise energy E1Wind noise energy E2And road noise energy E3。
When N incoherent sound sources exist in a sound field, the superposed sound energy is the superposition of the original sound energy, namely the noise energy E of the power system1The wind noise energy E2And the road noise energy E3The combined acoustic energy E can be obtained by mutual superpositionx. Noise energy E of the power system1Is generated by a power system, the power system comprising at least one of: the engine, air intake system, exhaust system and transmission system. The wind noise energy E2Is generated by the action of the body and the airflow of the vehicle under the running working condition. The road noise energy E3Is generated by the friction between the tire and the ground under the running condition of the vehicle.
It should be noted that, at different vehicle speeds, the main source of the noise in the vehicle is different. The primary source of noise for an automobile at low speeds is the power system noise energy, at medium speeds is the road noise energy, and at high speeds the most dominant source is the wind noise energy.
The whole vehicle road testing system provided by the embodiment of the invention can be used for testing the comprehensive sound energy E in the vehicle when the vehicle runs at the calibrated speedxAnd (6) carrying out testing. The whole vehicle road testing system comprises a vehicle driving robot, a vehicle control system, a vehicle body sensor and other components. The acoustic environment for the whole vehicle road test has the following conditions: the sound radiated from the vehicle can only be reflected by the road surface as noise in the vehicleA part of the sound, which cannot be reflected by a building, a wall or a similar large object outside the car, becomes noise inside the car, and the distance between the car and such a large object should be greater than 20m during the measurement. The weather of the whole vehicle road test has the following conditions: the temperature outside the car must be in the range-5 to +35 c, the wind speed at a height of about 1.2m along the measuring route must not exceed 5m/s, and other meteorological conditions must not affect the measurement result. The test road for the whole vehicle road test has the following conditions: the road section to be tested is a hard road surface, which must be as smooth as possible without seams, bumps or similar surface structures, otherwise the sound pressure level inside the automobile will be increased, and the road surface must be dry without snow, dirt, stones, leaves and other impurities. The running condition of the vehicle tested on the whole vehicle road is constant speed running.
The vehicle runs at a constant speed at a calibrated speed in the whole vehicle road test, and the speed can be set according to actual needs.
In this embodiment, the calibrated speed may optionally comprise 60km/h or 120 km/h.
It should be noted that the calibration speed is 60km/h for simulating urban working conditions, and the calibration speed is 120km/h for simulating high-speed working conditions, and in addition, other speeds can be set according to requirements. In order to reduce the influence of the wind speed and the road surface consistency on the test result, the vehicle respectively makes multiple round trips when running at each vehicle speed. To avoid a neutral stall condition, the vehicle transmission is in D or highest gear so that a prescribed speed range can be covered without shifting gears. The time for measuring the sound pressure level value is 5s or more each time when the vehicle is driven at each vehicle speed.
Specifically, the vehicle is placed on the surface of a dry road, the temperature outside the vehicle is not lower than-5 ℃ and not higher than 35 ℃, no large object exists in a test road section, and the wind speed is 3 m/s; mounting sound collecting devices at a plurality of different positions in the vehicle, wherein the sound collecting devices can be artificial heads or microphones, and the mounting positions of the sound collecting devices can be the head positions of passengers or the head positions of drivers; controlling a vehicle transmission gearIn the D gear, the vehicle runs at a constant speed of 60km/h for a distance of 200m and returns for 2 times, and sound pressure signals of the vehicle are collected; controlling the vehicle to run at a constant speed of 120km/h for a distance of 200m without gear shifting, and collecting sound pressure signals of the vehicle after the vehicle runs back and forth for 2 times; obtaining the sound pressure level L of each sound acquisition device by utilizing the sound pressure signals acquired by the sound acquisition devices; obtaining the comprehensive sound energy E by calculation according to the sound pressure level Lx。
S120, acquiring the noise energy of the single power system of the vehicle at the calibrated speed in the low-noise transmission system test bed; and acquiring single wind noise energy of the vehicle at the calibrated speed in the acoustic wind tunnel test stand.
The low-noise transmission system test bed is used for measuring the noise energy in the vehicle when the vehicle only uses a power system as a noise source in the vehicle at a calibrated speed. The low-noise transmission system test bed comprises a movable lifter, a wheel supporting base, a wheel load dynamometer, a supporting bearing, a motor load and an engine simulator. Wherein the movable lifter is used for lifting the vehicle; the wheel supporting base is used for supporting a vehicle body, and can adjust the wheelbase and the wheelbase according to different types of vehicles, and the embodiment of the invention aims to eliminate noise generated by friction between wheels and the ground; the wheel load dynamometer is used for testing the power of an engine of a vehicle under different running conditions, and can be a direct current dynamometer, an alternating current dynamometer or an eddy current dynamometer; the supporting bearing is used for providing road resistance, in order to ensure that the working state of a vehicle running on the low-noise transmission system test bed is consistent with that of a finished vehicle road test, the road resistance is data acquired in the finished vehicle road test and is applied to the low-noise transmission system test bed, and in addition, in order to ensure the transmission of vehicle power, the supporting bearing flange is connected with the wheel load dynamometer; the motor load is used for providing voltage for the low-noise transmission system test; the engine simulator is used for inputting and outputting signals generated by various sensors on the simulated engine.
In the above technical solution, optionally, the low noise driveline testing stand is used for lifting the vehicle by the lifter, and the vehicle is replaced by the wheel support bearing, which is used for providing road resistance for collection of single powertrain noise energy.
It will be appreciated that in embodiments of the invention, to test single powertrain noise energy, and to eliminate the effects of road noise energy and wind noise energy on the test results, the wheels are all disassembled and placed in a low noise driveline test room. The advantage of setting up like this is, can eliminate the influence of way noise energy and wind noise energy to the test result, makes the test result more accurate.
Specifically, a vehicle is placed on a low-noise transmission system test bed, the vehicle is lifted through a movable lifter, and all wheels are disassembled; adjusting the position of the wheel supporting base according to the wheel track and the wheel base of the wheel; the wheel is replaced by a support bearing, and a wheel support bearing flange is connected with a wheel load dynamometer so as to ensure the transmission of force; in addition, the wheel support bearing also provides the same road resistance as that during the road test of the whole vehicle; mounting sound collecting devices at a plurality of different positions in the vehicle, wherein the sound collecting devices can be artificial heads or microphones, and the mounting positions of the sound collecting devices can be the head positions of passengers or the head positions of drivers; starting an engine simulator, controlling the rotating speed of a vehicle engine to ensure that the rotating speed of the vehicle engine is consistent with the rotating speed of the engine with the actual running speed of 60km/h, and acquiring a sound pressure signal of the engine; controlling the rotating speed of an engine of the vehicle to ensure that the rotating speed of the engine is consistent with that of the engine with the actual running speed of 120km/h, and acquiring a sound pressure signal of the engine; collecting sound pressure signals by using sound collecting devices to obtain the sound pressure level L of each sound collecting device1(ii) a According to sound pressure level L1Obtaining the noise energy E of the single power system through calculation1。
In addition, the acoustic wind tunnel test rig is mainly used for measuring the area generated by the wind noise source and testing the spatial distribution of the sound spectrum and the sound intensity (such as sound pressure level).
In the above technical scheme, optionally, the acoustic wind tunnel test bed is used for blowing the wind speed consistent with the calibrated speed in a direction that the vehicle head points to the vehicle tail so as to collect the single wind noise energy.
The advantage of this setting is, can eliminate the influence of way noise energy and power system noise energy to the test result, make the test result more accurate.
Specifically, a vehicle is fixed in the acoustic wind tunnel test bed, and the test working condition of the acoustic wind tunnel test bed is the same as the test working condition of the whole vehicle road test and the test working condition of the low-noise transmission system test bed; mounting sound collecting devices at a plurality of different positions in the vehicle, wherein the sound collecting devices can be artificial heads or microphones, and the mounting positions of the sound collecting devices can be the head positions of passengers or the head positions of drivers; artificially manufacturing airflow, enabling the airflow to flow through a vehicle body, enabling the airflow to flow for 1 minute at the flow speed of 60km/h according to the direction that a vehicle head points to a vehicle tail, and collecting sound pressure signals of the airflow; the airflow flows for 1 minute at the flow speed of 120km/h according to the direction that the vehicle head points to the vehicle tail, and sound pressure signals of the airflow are collected; collecting sound pressure signals by using sound collecting devices to obtain the sound pressure level L of each sound collecting device2(ii) a According to sound pressure level L2Obtaining single wind noise energy E through calculation2。
S130, according to the noise energy E of the single power system1And said combined acoustic energy ExDetermining the weight of the noise energy of the power system in the vehicle at the calibrated speed; and, according to said single wind noise energy E2And said combined acoustic energy ExDetermining the wind noise energy weight in the vehicle at the calibrated speed; and determining the road noise energy weight in the vehicle at the calibrated speed according to the power system noise energy weight and the wind noise energy weight.
The acoustic energy may be calculated from the measured sound pressure level, for example, the acoustic energy may be determined using the following formula:
wherein E isiIs acoustic energy, PiTo measure the resulting sound pressure, P0The sound pressure is air reference sound pressure, and is generally 2 multiplied by 10-5Pa，LiTo test the resulting sound pressure level.
In the embodiment of the invention, the comprehensive sound energy E is obtained by using the road test of the whole vehiclexThe single power system noise energy E is obtained by utilizing a low-noise transmission system test bed1And, obtaining a single wind noise energy E using an acoustic wind tunnel test rig2。
In this embodiment, optionally, determining a power system noise energy weight in the vehicle at the calibrated speed according to the single power system noise energy and the comprehensive noise energy by using an energy-to-ratio method includes:
determining the noise energy weight of the power system by adopting the following formula:
α1＝E1/Ex×100％；
wherein alpha is1As a power system noise energy weight, E1For noise energy of a single power system, ExTo synthesize the acoustic energy. The advantage of setting up like this is, make power system noise energy can accurate quantization, better separation vehicle interior noise source.
In this embodiment, optionally, determining the wind noise energy weight in the vehicle at the calibrated speed according to the single wind noise energy and the comprehensive acoustic energy by using an energy ratio method includes:
determining a wind noise energy weight using the following equation:
α2＝E2/Ex×100％；
wherein alpha is2As a wind noise energy weight, E2For a single wind noise energy, ExTo synthesize the acoustic energy. The advantage of this kind of setting is, make wind noise energy can accurate quantization, better separation vehicle noise source.
In this embodiment, optionally, determining the weight of the road noise energy in the vehicle at the calibrated speed according to the weight of the noise energy in the power system and the weight of the wind noise energy includes:
determining the road noise energy weight by adopting the following formula:
α3＝(1-α1-α2)×100％；
wherein alpha is3As weight of road noise energy, alpha1As a power system noise energy weight, alpha2Is the wind noise energy weight. The advantage of this arrangement is that the testing of the road noise energy is simplified, the road noise energy weight ratio can be determined only by accurately and quantitatively testing the noise energy and wind noise energy of the power system, and testing the comprehensive noise energy, and the noise source in the vehicle can be further separated.
Obtaining energy weights { alpha ] of three noise sources including power system noise, wind noise and road noise according to the calculation method1，α2，α3Accurately quantizing three noise sources under typical use scenes (such as urban conditions and high-speed conditions) of a user, obtaining main noise sources in the vehicle according to the energy weight, and guiding forward development of NVH (noise, vibration and harshness) performance according to the weight proportion of different noise sources in the vehicle.
According to the technical scheme of the embodiment of the invention, comprehensive sound energy, power system noise energy and wind noise energy are respectively measured through a whole vehicle road test, a low-noise transmission system test bed and an acoustic wind tunnel test bed, and power system noise energy weight, wind noise energy weight and road noise energy weight are calculated accordingly.
Example two
Fig. 2 is a block diagram of a device for separating an in-vehicle noise source according to a second embodiment of the present invention, where the device can execute the method for separating an in-vehicle noise source according to any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. As shown in fig. 2, the apparatus may include:
the comprehensive sound energy acquisition module 210 is configured to acquire comprehensive sound energy obtained when the vehicle runs at a calibrated speed in a finished vehicle road test; wherein the comprehensive sound energy comprises power system noise energy, wind noise energy and road noise energy;
the single sound energy obtaining module 220 is used for obtaining the single power system noise energy of the vehicle at the calibrated speed in the low-noise transmission system test bed; acquiring single wind noise energy of the vehicle at a calibrated speed in the acoustic wind tunnel test bed;
a weight determining module 230, configured to determine a weight of the noise energy of the power system in the get-off vehicle at the calibrated speed according to the noise energy of the single power system and the comprehensive noise energy; determining the weight of wind noise energy in the vehicle at a calibrated speed according to the single wind noise energy and the comprehensive sound energy; and determining the road noise energy weight in the vehicle at the calibrated speed according to the power system noise energy weight and the wind noise energy weight.
Further, the single acoustic energy obtaining module 220 is specifically configured to:
determining the noise energy weight of the power system by adopting the following formula:
α1＝E1/Ex×100％；
wherein alpha is1As a power system noise energy weight, E1For noise energy of a single power system, ExTo synthesize the acoustic energy.
Further, the single acoustic energy obtaining module 220 is specifically configured to:
determining a wind noise energy weight using the following equation:
α2＝E2/Ex×100％；
wherein alpha is2As a wind noise energy weight, E2For a single wind noise energy, ExTo synthesize the acoustic energy.
Further, the single acoustic energy obtaining module 220 is specifically configured to:
determining the road noise energy weight by adopting the following formula:
α3＝(1-α1-α2)×100％；
wherein alpha is3As weight of road noise energy, alpha1As a power system noise energy weight, alpha2Is the wind noise energy weight.
Further, the calibration speed comprises 60km/h or 120 km/h.
Further, the low noise driveline test stand is used to lift the vehicle up via the lift, replacing the vehicle with wheel support bearings that provide road resistance for single driveline noise energy harvesting.
Furthermore, the acoustic wind tunnel test bed is used for blowing the wind speed consistent with the calibrated speed in the direction that the vehicle head points to the vehicle tail so as to collect the single wind noise energy.
The device can execute the method for separating the noise source in the vehicle, and has the corresponding functional modules and beneficial effects of the execution method.
EXAMPLE III
A third embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a method for separating an in-vehicle noise source according to any of the embodiments of the present invention, where the method includes:
acquiring comprehensive sound energy obtained by driving a vehicle at a calibrated speed in a finished vehicle road test; wherein the comprehensive sound energy comprises power system noise energy, wind noise energy and road noise energy;
acquiring the noise energy of a single power system of a vehicle at a calibrated speed in a low-noise transmission system test bed; acquiring single wind noise energy of the vehicle at a calibrated speed in the acoustic wind tunnel test bed;
determining the power system noise energy weight in the vehicle at the calibrated speed according to the single power system noise energy and the comprehensive noise energy; determining the weight of wind noise energy in the vehicle at a calibrated speed according to the single wind noise energy and the comprehensive sound energy; and determining the road noise energy weight in the vehicle at the calibrated speed according to the power system noise energy weight and the wind noise energy weight.
Optionally, the program may be further configured to perform the method for separating the in-vehicle noise source according to any embodiment of the present invention when executed by the processor.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take a variety of forms, including, but not limited to: an electromagnetic signal, an optical signal, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, Radio Frequency (RF), etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It should be noted that, in the embodiment of the above-mentioned in-vehicle noise source separation apparatus, each included unit and module are only divided according to functional logic, but are not limited to the above division, as long as the corresponding function can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
Example four
Fig. 3 is a schematic structural diagram of an apparatus according to a fourth embodiment of the present invention, as shown in fig. 3, the apparatus includes a processor 310, a memory 320, an input device 330, and an output device 340; the number of the processors 310 in the device may be one or more, and one processor 310 is taken as an example in fig. 3; the processor 310, the memory 320, the input device 330 and the output device 340 in the apparatus may be connected by a bus or other means, and fig. 3 illustrates the connection by a bus as an example.
The memory in the device, as a computer-readable storage medium, may be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to in-vehicle noise source separation in embodiments of the present invention (e.g., the integrated acoustic energy harvesting module 210, the single acoustic energy harvesting module 220, and the weight determination module 230). The processor 310 executes various functional applications of the device and data processing, i.e., the above-described method for separating the noise sources in the vehicle, by executing software programs, instructions, and modules stored in the memory 320.
The memory 320 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 320 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 320 may further include memory located remotely from the processor 310, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 330 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the apparatus. The output device 340 may include a display device such as a display screen.
And, when the one or more programs included in the above electronic device are executed by the one or more processors 310, the programs perform the following operations:
acquiring comprehensive sound energy obtained by driving a vehicle at a calibrated speed in a finished vehicle road test; wherein the comprehensive sound energy comprises power system noise energy, wind noise energy and road noise energy;
acquiring the noise energy of a single power system of a vehicle at a calibrated speed in a low-noise transmission system test bed; acquiring single wind noise energy of the vehicle at a calibrated speed in the acoustic wind tunnel test bed;
determining the power system noise energy weight in the vehicle at the calibrated speed according to the single power system noise energy and the comprehensive noise energy; determining the weight of wind noise energy in the vehicle at a calibrated speed according to the single wind noise energy and the comprehensive sound energy; and determining the road noise energy weight in the vehicle at the calibrated speed according to the power system noise energy weight and the wind noise energy weight.
The device, the medium and the electronic device for separating the in-vehicle noise source provided in the above embodiments can execute the method for separating the in-vehicle noise source provided in any embodiment of the present application, and have corresponding functional modules and beneficial effects for executing the method. Technical details that are not described in detail in the above embodiments may be referred to a method for separating an in-vehicle noise source provided in any embodiment of the present application.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for separating a noise source in an automobile, the method comprising:
acquiring comprehensive sound energy obtained by driving a vehicle at a calibrated speed in a finished vehicle road test; wherein the comprehensive sound energy comprises power system noise energy, wind noise energy and road noise energy;
acquiring the noise energy of a single power system of a vehicle at a calibrated speed in a low-noise transmission system test bed; acquiring single wind noise energy of the vehicle at a calibrated speed in the acoustic wind tunnel test bed;
determining the power system noise energy weight in the vehicle at the calibrated speed according to the single power system noise energy and the comprehensive noise energy; determining the weight of wind noise energy in the vehicle at a calibrated speed according to the single wind noise energy and the comprehensive sound energy; and determining the road noise energy weight in the vehicle at the calibrated speed according to the power system noise energy weight and the wind noise energy weight.
2. The method of claim 1, wherein determining a power system noise energy weight within a calibrated speed alighting from the single power system noise energy and the aggregate noise energy comprises:
determining the noise energy weight of the power system by adopting the following formula:
α1＝E1/Ex×100％；
wherein alpha is1As a power system noise energy weight, E1For noise energy of a single power system, ExTo synthesize the acoustic energy.
3. The method of claim 1, wherein determining an in-vehicle wind noise energy weight at a calibrated speed from the single wind noise energy and the integrated acoustic energy comprises:
determining a wind noise energy weight using the following equation:
α2＝E2/Ex×100％；
wherein alpha is2As a wind noise energy weight, E2For a single wind noise energy, ExTo synthesize the acoustic energy.
4. The method of claim 1, wherein determining an in-vehicle road noise energy weight at a calibrated speed based on the powertrain noise energy weight and the wind noise energy weight comprises:
determining the road noise energy weight by adopting the following formula:
α3＝(1-α1-α2)×100％；
wherein alpha is3As weight of road noise energy, alpha1As a power system noise energy weight, alpha2Is the wind noise energy weight.
5. A method according to any of claims 1-4, characterized in that said nominal speed comprises 60km/h or 120 km/h.
6. The method of claim 1, wherein the low noise driveline test stand is used to lift the vehicle up via an elevator, and the vehicle is replaced by wheel support bearings that provide road resistance for single powertrain noise energy harvesting.
7. The method according to claim 1, wherein the acoustic wind tunnel test stand is used for blowing the wind speed consistent with the calibrated speed in the direction that the vehicle head points to the vehicle tail so as to collect the single wind noise energy.
8. A separation apparatus of an in-vehicle noise source, characterized by comprising:
the comprehensive sound energy acquisition module is used for acquiring comprehensive sound energy obtained by driving a vehicle at a calibrated speed in a finished vehicle road test; wherein the comprehensive sound energy comprises power system noise energy, wind noise energy and road noise energy;
the single sound energy acquisition module is used for acquiring the single power system noise energy of the vehicle at the calibrated speed in the low-noise transmission system test bed; acquiring single wind noise energy of the vehicle at a calibrated speed in the acoustic wind tunnel test bed;
the weight determining module is used for determining the weight of the noise energy of the power system in the vehicle at the calibrated speed according to the noise energy of the single power system and the comprehensive noise energy; determining the weight of wind noise energy in the vehicle at a calibrated speed according to the single wind noise energy and the comprehensive sound energy; and determining the road noise energy weight in the vehicle at the calibrated speed according to the power system noise energy weight and the wind noise energy weight.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of separating an in-vehicle noise source according to any one of claims 1 to 7.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the method for separating a source of noise in a vehicle according to any one of claims 1 to 7.
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