CN105300706A - NVH performance test method for automobile acoustic package - Google Patents
NVH performance test method for automobile acoustic package Download PDFInfo
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- CN105300706A CN105300706A CN201510689778.2A CN201510689778A CN105300706A CN 105300706 A CN105300706 A CN 105300706A CN 201510689778 A CN201510689778 A CN 201510689778A CN 105300706 A CN105300706 A CN 105300706A
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Abstract
The invention relates to an NVH performance test method for an automobile acoustic package. A noise generation unit and noise collection units are included, and the output end of the noise generation unit is connected with a signal processing unit via the near-field noise collection unit or via a noise transmission path and the far-field noise collection unit. A volume sound source, a microphone and the signal processing unit are mainly used in the method, in the test process, a vehicle needs to be placed in a fully-anechoic or semi-anechoic room, the volume sound source is placed in the vehicle to emit sound, the microphone is arranged in a specific position, response of a corresponding path in specific time is obtained to calculate the sound attenuation amount of the acoustic packet in the path, and the NVH performance of the acoustic package in the path is thus tested and evaluated to develop and optimize the automobile acoustic package. According to the method, needed equipment is simple, the cost is low, the method can be applied to NVH performance test and evaluation for different types of vehicles, and thus, a simple, particle and economical test method is provided for development and optimization of the automobile acoustic packages.
Description
Technical field
The present invention relates to car acpistocs packaging NVH performance test and assessment technique field, specifically a kind of car acpistocs packaging NVH performance test methods.
Background technology
Along with popularizing of automobile, consumer requires more and more higher to automobile noise.In auto idle speed and driving process, car acpistocs bag is very large on internal car noise impact as the barrier of pass-by noise, appropriate design with optimize acoustics bag obtain allow passenger meet to take environment very crucial.In early stage and the later stage of the exploitation of acoustics packaging, how correct assessment acoustics bag NVH performance is a difficult problem always.
At present, car acpistocs bag monomer NVH Performance Evaluation needs by standing wave tube or Alpha's acoustic cabin, and the test of monomer cannot the NVH performance level of comprehensive assessment car load, can only evaluate the performance situation up to standard of acoustics bag monomer; The NVH Performance Evaluation of car acpistocs bag entirety needs by reverberation chamber, the method wastes time and energy, and cost is higher, compact car enterprise is difficult to adopt the method to carry out acoustics packaging NVH performance development (in earlier stage) and checking (early stage and later stage) to car load.
Summary of the invention
The object of this invention is to provide the method for testing of a kind of car acpistocs packaging NVH performance.With solve current automobile cannot fast, the problem of the assessment car acpistocs bag NVH performance of efficient and low cost, the object of achieve effective control car acpistocs bag NVH performance.
The object of the invention is to realize by following technical solution:
A kind of method of testing of car acpistocs packaging NVH performance, it includes the noise generation unit as volume sound source, as the Noise Acquisition unit of microphone, it is characterized in that: described noise generation unit output terminal is connected with the input end of signal processing unit respectively by near field noise collecting unit and noise transfer path, far-field noise collecting unit;
This method of testing comprises the following steps:
1. car load is placed in whole elimination room or semianechoic room;
2. be arranged in passenger compartment using the noise generation unit as volume sound source, send white noise, sound pressure level is not less than 100dB (A);
3. the Noise Acquisition cell layout as microphone is produced position in noise, be connected with signal processing unit by Noise Acquisition unit, and carry out Initialize installation;
4. measuring microphone signal in analysis software, record 10s, valid data gather four groups, are used for carrying out test and evaluation to acoustics bag NVH performance level;
5. in signal processing unit late time data processing procedure, the difference of formulae discovery volume sound source near-field acoustic pressure and each microphone acoustic pressure is calculated by acoustic attenuation gauge, i.e. each sound transmission path acoustic attenuation amount, for the NVH performance of assessment each path acoustics bag;
6. when acoustic attenuation amount target making, according to the test result in competing product car or database, can formulate, if without competing product car and database, in principle, in 400 to 8000Hz, acoustic attenuation amount target is not less than 40dB.
Testing or evaluating in certain vehicle acoustics packaging NVH performance process, if find, the acoustic attenuation amount in a certain noise transfer path does not meet NVH target, need to investigate acoustics packaging Problems on this path, the content of investigation comprises impermeability, acoustics packaging material material area coverage, via seal, the transmission loss of acoustics wrappage and acoustical absorption coefficient.
Use the method can obtain the damping capacity of acoustics bag to automobile noise directly, efficiently, test result comprises all paths that noise source commonly used by automobile, can each noise transfer path of comprehensive assessment to the Reduction Level of noise.The method is simple, efficient, it is low to drop into, and the testing apparatus not needing purchase cost high and frock, do not limit by vehicle, for car acpistocs bag NVH performance development and optimizing provides a kind of simple, practicality, economic test and appraisal procedure.
Described noise produces position and refers to employing 13 microphone test records, and record comprises respectively: a volume sound source near field, four tires, air inlet, an exhaust and six power assemblies, volume sound source near field microphone is arranged in driver's auris dextra, tire four microphones were arranged in tire axial line YZ plane, distance tyre sidewall 10cm, distance ground 15cm, 45 degree obliquely, air intake opening microphone overlaps with air intake opening geometric center lines, vertically points to air intake opening, overlaps with air inlet section, exhaust microphone and car load X point to exhaust tail mouth to angle at 45 °, distance exhaust tail mouth of pipe cross section 5cm, power assembly six microphone distance power assemblies six (on, under, before, after, left, right) outside surface 5cm, upper surface and lower surface microphone are positioned at each surface geometry center, along-X to sensing passenger compartment, left surface microphone vertically points to variator upper surface geometric center, right surperficial microphone edge-Y-direction vertically points to right surface geometry center, front surface microphone is positioned at power assembly and cooling fan mid point, vertical sensing power assembly front surface geometric center, mid point edge-the Y-direction that rear surface microphone is positioned at power assembly rear surface geometric center and fire wall distance points to driver.
As preferably, volume sound source near field microphone is arranged in pilothouse chief aviation pilot position, and vertically upward, height and driver's auris dextra are with high for the volume sound source mouth of pipe.
As preferred steps 4) test collection four groups of test figures, test figure is averaged, obtains test findings more accurately.
As preferred steps 5) by calculating the difference of volume sound source near-field acoustic pressure and far field, each path microphone acoustic pressure, i.e. each sound transmission path acoustic attenuation amount, for the NVH performance of assessment each path acoustics bag.
As preferred steps 6) acoustic attenuation amount target making needs are according to relevant vehicle NVH target making strategy, and the acoustic attenuation amount situation in conjunction with basic car and competing product car is formulated;
If be discontented with foot-eye requirement as preferred acoustic attenuation amount, investigation comprises impermeability, acoustics packaging material material area coverage, via seal, the transmission loss of acoustics wrappage and acoustical absorption coefficient with the content optimized.
Need to use deadener shutoff as preferred exhausr port, truly to obtain the acoustics bag NVH performance to exhaust tail mouth path in car.
Effective effect of the present invention is, can obtain the attenuation of acoustics bag to noise by the method, be comprise vehicle commonly use noise source, comprehensively, directly, efficiently, effective method of testing.The test method of the method application is simple, and have very strong versatility, can adapt to various acoustics bag to the assessment of noise attenuation, experimentation cost is cheap.
Accompanying drawing explanation
Fig. 1 is principle of work block scheme of the present invention;
Fig. 2 is that simplified schematic diagram arranged by volume sound source of the present invention and microphone;
Fig. 3 is of the present invention for the testing apparatus connection layout of exhaust tail mouth microphone.
In accompanying drawing, critical piece illustrates: 1 is driver's auris dextra volume sound source position; 2 is front tyre far field microphone positions; 3 is rear tyre far field sensor positions; 4 is air intake opening far field microphone positions; 5 is exhausr port far field microphone positions; 6 is power assembly upper surface microphone positions; 7 is near field noise collecting unit (namely volume sound source near-field signals obtains microphone); 8 is far-field noise collecting unit (namely via signal acquisition microphone after each bang path); 9 is signal processing unit (i.e. data acquisition equipments); 10 is noise generation unit (i.e. volume sound source).
Embodiment
Example 1
Shown in Fig. 1-3, car acpistocs packaging NVH performance test methods of the present invention, it includes the noise generation unit as volume sound source, as the Noise Acquisition unit of microphone, described noise generation unit output terminal is connected with the input end of signal processing unit respectively by near field noise collecting unit and noise transfer path, far-field noise collecting unit;
This method of testing comprises the following steps: be first placed on by car load in whole elimination room or semianechoic room;
In the present embodiment, Fig. 1 is principle of work block scheme, as shown in the figure, white noise is sent by noise generation unit (i.e. volume sound source), near noise generation unit, adopt near field noise collecting unit (i.e. microphone 7 in Fig. 3) to collect the voice signal of noise generation unit, input to signal processing unit (i.e. data acquisition equipment); In addition, noise generation unit sends white noise, via each noise transfer path, by front tyre far field microphone position 2 in the far-field noise collecting unit in each path and Fig. 2, rear tyre far field sensor position 3, air intake opening far field microphone position 4, exhausr port far field microphone position 5, the microphone that power assembly upper surface microphone position 6 is arranged obtains, and the same input signal processing unit of signal, carries out data analysis and process.
Described noise produces position and refers to employing 13 microphone positions, comprises respectively: a volume sound source near field, four tires, air inlet, an exhaust and six power assemblies, volume sound source near field microphone is arranged in driver's auris dextra, tire four microphones were arranged in tire axial line YZ plane, distance tyre sidewall 10cm, distance ground 15cm, 45 degree obliquely, air intake opening microphone overlaps with air intake opening geometric center lines, vertically points to air intake opening, overlaps with air inlet section, exhaust microphone and car load X point to exhaust tail mouth to angle at 45 °, distance exhaust tail mouth of pipe cross section 5cm, power assembly six microphone distance power assemblies six (on, under, before, after, left, right) outside surface 5cm, upper surface and lower surface microphone are positioned at each surface geometry center, along-X to sensing passenger compartment, left surface microphone vertically points to variator upper surface geometric center, right surperficial microphone edge-Y-direction vertically points to right surface geometry center, front surface microphone is positioned at power assembly and cooling fan mid point, vertical sensing power assembly front surface geometric center, mid point edge-the Y-direction that rear surface microphone is positioned at power assembly rear surface geometric center and fire wall distance points to driver.
Test position in the present embodiment as shown in Figure 2, testing equipment comprises: driver's auris dextra volume sound source is arranged in position 1, microphone is arranged in as front tyre far field microphone position 2, rear tyre far field sensor position 3, air intake opening far field microphone position 4, exhausr port far field microphone position 5, power assembly upper surface microphone position 6.
Send standard white noise by volume sound source in the present embodiment, obtain corresponding voice signal by microphone, by data acquisition equipment recording voice signal, carry out playback and aftertreatment.
Measuring microphone signal in analysis software, record 10s, valid data gather four groups, are used for carrying out test and evaluation to acoustics bag NVH performance level;
When carrying out data analysis and process in the present embodiment, analyst can obtain the signal of volume sound source, and via correlation noise bang path, (sound source is to tire, sound source is to air inlet, sound source is to exhaust, sound source is to each outside surface of power assembly) acoustic attenuation amount, acoustic attenuation amount computing formula is as follows:
NR=SPL
near field-SPL
far field
Wherein, NR represents acoustic attenuation amount, SPL
near fieldrepresent the sound pressure level that near field noise collecting unit collects, SPL
far fieldrepresent the sound pressure level that far-field noise collecting unit collects.
The acoustic attenuation amount obtained in the present embodiment, can be used as vehicle and designs and develops NVH target, also can be used for the optimal design instructing existing vehicle acoustical bag.
Concrete acoustic attenuation amount NVH target is not provided in the present embodiment, consider the platform of vehicle and the difference of cost, acoustic attenuation amount target needs to formulate in conjunction with the test result in competing product car test data or database, if without competing product car and database, in principle, in 400 to 8000Hz, acoustic attenuation amount target is not less than 40dB.
Testing or evaluating in certain vehicle acoustics packaging NVH performance process in the present embodiment, if find, the acoustic attenuation amount in a certain noise transfer path does not meet NVH target, need to investigate acoustics packaging Problems on this path, the content of investigation comprises impermeability, acoustics packaging material material area coverage, via seal, the transmission loss of acoustics wrappage and acoustical absorption coefficient.
Above-described is only the preferred embodiments of the invention, for those skilled in the art, under the prerequisite not departing from technical characteristic of the present invention, can also make some improvement, and these improvement also should be considered as protection scope of the present invention.
Claims (5)
1. the method for testing of a car acpistocs packaging NVH performance, it includes the noise generation unit as volume sound source, as the Noise Acquisition unit of microphone, it is characterized in that: described noise generation unit output terminal is connected with the input end of signal processing unit respectively by near field noise collecting unit and noise transfer path, far-field noise collecting unit;
This method of testing comprises the following steps:
1. car load is placed in whole elimination room or semianechoic room;
2. be arranged in passenger compartment using the noise generation unit as volume sound source, send white noise, sound pressure level is not less than 100dB (A);
3. the Noise Acquisition cell layout as microphone is produced position in noise, be connected with signal processing unit by Noise Acquisition unit, and carry out Initialize installation;
4. measuring microphone signal in analysis software, record 10s, valid data gather four groups, are used for carrying out test and evaluation to acoustics bag NVH performance level;
5. in signal processing unit late time data processing procedure, the difference of formulae discovery volume sound source near-field acoustic pressure and each microphone acoustic pressure is calculated by acoustic attenuation gauge, i.e. each sound transmission path acoustic attenuation amount, for the NVH performance of assessment each path acoustics bag;
6. when acoustic attenuation amount target making, according to the test result in competing product car or database, can formulate, if without competing product car and database, in principle, in 400 to 8000Hz, acoustic attenuation amount target is not less than 40dB.
2. the method for testing of car acpistocs packaging NVH performance according to claim 1, it is characterized in that: described noise produces position and refers to employing 13 microphone test records, record comprises respectively: a volume sound source near field, four tires, air inlet, an exhaust and six power assemblies, volume sound source near field microphone is arranged in driver's auris dextra, tire four microphones were arranged in tire axial line YZ plane, distance tyre sidewall 10cm, distance ground 15cm, 45 degree obliquely, air intake opening microphone overlaps with air intake opening geometric center lines, vertically points to air intake opening, overlaps with air inlet section, exhaust microphone and car load X point to exhaust tail mouth to angle at 45 °, distance exhaust tail mouth of pipe cross section 5cm, power assembly six microphone distance power assemblies six (on, under, before, after, left, right) outside surface 5cm, upper surface and lower surface microphone are positioned at each surface geometry center, along-X to sensing passenger compartment, left surface microphone vertically points to variator upper surface geometric center, right surperficial microphone edge-Y-direction vertically points to right surface geometry center, front surface microphone is positioned at power assembly and cooling fan mid point, vertical sensing power assembly front surface geometric center, mid point edge-the Y-direction that rear surface microphone is positioned at power assembly rear surface geometric center and fire wall distance points to driver.
3. the method for testing of car acpistocs packaging NVH performance according to claim 1, is characterized in that: acoustic attenuation amount computing formula is as follows:
NR=SPL
near field-SPL
far field
Wherein, NR represents acoustic attenuation amount, SPL
near fieldrepresent the sound pressure level that near field noise collecting unit collects, SPL
far fieldrepresent the sound pressure level that far-field noise collecting unit collects.
4. the method for testing of car acpistocs packaging NVH performance according to claim 2, is characterized in that: volume sound source near field microphone is arranged in pilothouse chief aviation pilot position, and vertically upward, height and driver's auris dextra are with high for the volume sound source mouth of pipe.
5. the method for testing of car acpistocs packaging NVH performance according to claim 2, it is characterized in that: by calculating the difference of volume sound source near-field acoustic pressure and far field, each path microphone acoustic pressure, each sound transmission path acoustic attenuation amount i.e., for the NVH performance of assessment each path acoustics bag.
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| CN105716708A (en) * | 2016-01-29 | 2016-06-29 | 安徽江淮汽车股份有限公司 | Noise source separation method of uniform speed noise |
| CN106226397A (en) * | 2016-08-31 | 2016-12-14 | 江苏金坛长荡湖新能源科技有限公司 | A kind of arrangements for automotive doors acoustics leakage performance method of testing |
| CN106644512A (en) * | 2016-12-22 | 2017-05-10 | 北京汽车股份有限公司 | Noise analysis method and system based on power assembly loads |
| CN108225789A (en) * | 2017-12-22 | 2018-06-29 | 重庆长安汽车股份有限公司 | A kind of internal combustion engine vehicle NVH performance degradation evaluation methods |
| CN108267321A (en) * | 2016-12-30 | 2018-07-10 | 华晨汽车集团控股有限公司 | A kind of test and evaluation method of car acpistocs packaging sound absorption performance |
| CN108362508A (en) * | 2018-04-12 | 2018-08-03 | 汪林 | Auto NVH detection device, method and automobile remaining life appraisal procedure |
| CN108507793A (en) * | 2017-02-27 | 2018-09-07 | 华晨汽车集团控股有限公司 | A kind of test and evaluation method of vehicle different sound performance |
| CN108732248A (en) * | 2017-04-25 | 2018-11-02 | 江铃汽车股份有限公司 | A kind of vehicle body is to engine noise sound-insulation capability test method |
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| CN113686586A (en) * | 2021-07-02 | 2021-11-23 | 中汽研（天津）汽车工程研究院有限公司 | Acoustic environment reappears test cabin for automobile |
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| CN114383848B (en) * | 2021-12-01 | 2023-09-26 | 江铃汽车股份有限公司 | Method, device, storage medium and equipment for predicting near-field airflow noise target value of supercharger |
| CN114745652A (en) * | 2022-03-07 | 2022-07-12 | 中国第一汽车股份有限公司 | Noise acquisition method, noise evaluation method and noise acquisition system for noise evaluation of sound in passenger vehicle |
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