CN103994892B - Test system for vehicle acoustical power and test method thereof - Google Patents
Test system for vehicle acoustical power and test method thereof Download PDFInfo
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- CN103994892B CN103994892B CN201410186769.7A CN201410186769A CN103994892B CN 103994892 B CN103994892 B CN 103994892B CN 201410186769 A CN201410186769 A CN 201410186769A CN 103994892 B CN103994892 B CN 103994892B
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Abstract
The invention provides a test system for a vehicle acoustical power. The test system includes a noise sensor, a pulse signal sensor and a signal acquisition device. The noise sensor is installed on an acoustical-power to-be-tested part of a vehicle. The pulse signal sensor is installed at the position of a vehicle crankshaft belt pulley. Both of the noise sensor and the pulse signal sensor are connected with the signal acquisition device through wire harnesses. The test system is capable of carrying out acoustical power test on main noise sources at different parts under a real-vehicle state, such as engine acoustical power, gas vent nozzle acoustical power and tyre acoustical power and the like. The test system reflects fully the acoustical power levels of the main noise sources under a real-vehicle operating work condition so that defects of current acoustical-power bench testing are compensated for. The test system is capable of obtaining effective comparison data and has a significance effect on a vehicle model development period and comparison work of noise levels of a competitive-product vehicle and a bench marking vehicle; and the whole set of system is convenient to arrange and a test method and a data processing method are simple and easy to use.
Description
Technical field
The present invention relates to a kind of vehicle acoustical power test system and method, belong to vehicle testing technical field.
Background technology
Power assembly acoustical power is mainly used in evaluating the size of automobile power assembly noise radiation energy, high the moving of acoustical power
Power assembly, it is accordingly higher to the outer influence of noise of in-car, so not only can affect the noise comfortableness of in-car, also influence whether car
The satisfaction of outer noise national standard level.Process it is necessary to it is imposed with more sound absorptions to obtain relatively low noise level.Currently
Power assembly acoustical power is tested still mainly based on bench test, is so difficult to meet the actual operating state of automobile and load water
Flat, it also is difficult to implement simultaneously for the lateral comparison with competing product car and mark post car.
Content of the invention
The problem to be solved in the present invention is to provide a kind of System and method for being capable of measuring vehicle acoustical power.
For solving above-mentioned technical problem, the technical solution used in the present invention is：A kind of vehicle acoustical power test system, including
Noise transducer, Pluse signal sensor and signal collecting device, described noise transducer is arranged on vehicle acoustical power portion to be measured
Position, described Pluse signal sensor is arranged at vehicle crank shaft pulley position, and described noise transducer and pulse signal sense
Device is all connected with signal collecting device by wire harness.
Further, described noise transducer is provided with several, is arranged at the acoustical power position to be measured of power assembly, for adopting
The noise signal of collection corresponding position.
Further, described Pluse signal sensor is arranged at vehicle crank shaft pulley position, by gathering at this position
Umber of pulse under vehicle difference operating mode for the crankshaft section belt pulley, and obtain the engine speed corresponding to corresponding operating mode.
Further, described signal collecting device is with carrying out the engine rotational speed signal being provided by recording pulse signal sensor
With the noise signal of each test position being provided by noise transducer, then vehicle difference work is obtained by post processor
The sound power value of Main Noise Sources under condition.
Further, install one in vehicle acoustical power detected part to be used for fixedly mounting the fixed support of noise transducer.
A kind of method of testing using above-mentioned vehicle acoustical power test system, comprises the steps：
Step one, test vehicle is parked on 4 wheel driven revolving drum test table it is ensured that four wheels are located at each rotating hub interposition
Put, after checking vehicle-state, by bandage, vehicle is fixed；
Step 2, removal of engine hatchcover, measure power assembly upper surface outer profile size；
Step 3, first several noise transducers are arranged on fixed support, then fixed support are placed in be measured dynamic
Around the outline of power assembly upper surface；Or first by fixed support be placed in measurement power assembly upper surface outline around,
Then several noise transducers are arranged on fixed support；
Step 4, starting electromotor, make vehicle operate under different operating modes, record above-mentioned noise transducer noise time domain number
According to the tach signal of recording pulse signal sensor acquisition simultaneously；
Step 5, test data analysis, carry out time-frequency conversion to the time domain data of corresponding noise transducer record, obtain each
The spectrum signal of measuring point, then calculates acoustic power level under different operating modes for the power assembly.
Further, in described step one, environment noise is less than 20dB.
Further, in described step 2, measure power assembly upper surface outer profile size, long including the long length of side, broadside.
Further, in described step 3, several noise transducers are arranged on various location on fixed support, with power
Assembly upper surface is z=0 plane, and coordinate system is car load coordinate system, and centre of surface point is zero thereon, according to surveyed side
Long, calculate each noise transducer position, thus calculate noise measuring point envelope size S.
Further, in described step 5, Fourier transformation is carried out to the time domain data of noise transducer record, obtains each survey
The spectrum signal of point, by formula LW=Lp+ 10lgS calculates acoustic power level under different operating modes for the power assembly.
The present invention has the advantages and positive effects that：The present invention can be main to its different parts under real vehicle state
Noise source carries out acoustical power to be tested, for example：Power assembly (electromotor) acoustical power, exhaust pipe mouth acoustical power, tire sound work(
Rate etc., fully reflects the acoustic power level of Main Noise Sources under real vehicle operating condition, compensate for current acoustical power stand and surveys
Deficiency in examination；The present invention can obtain effective correction data, its to automobile development stage and competing product car (inclusion imported vehicle),
The comparison work of mark post car (inclusion imported vehicle) noise level plays the role of important；Whole system arrangement is convenient, test side
Method is easy to use with data processing method.
Brief description
Fig. 1 is that test vehicle is parked in the schematic diagram on 4 wheel driven revolving drum test table；
Fig. 2 is power assembly acoustical power test system connection diagram；
Fig. 3 is power assembly acoustical power test noise sensor main view layout schematic diagram；
Fig. 4 is noise transducer arrangement schematic diagram right view in Fig. 3；
Fig. 5 is noise transducer arrangement schematic diagram top view in Fig. 3；
Fig. 6 is the noise spectrum signal of the embodiment of the present invention each noise transducer measuring point collection under certain operating mode；
Fig. 7 is the power assembly acoustic power level result that the present invention records under certain operating mode.
In figure：
1. power assembly, 2. vehicle body, 3. 4 wheel driven revolving drum test table, 4. noise transducer,
5. Pluse signal sensor, 6. wire harness, 7. signal collecting device, 8. equipment for after-treatment；
41. first noise transducers, 42 second noise transducers, 43. the 3rd noise transducers,
44. the 4th noise transducers, 45. the 5th noise transducers, 46. the 6th noise transducers.
Specific embodiment
For the understanding more deep to the present invention, a specific embodiment is set forth below, and combines accompanying drawing, the present invention is done
Further detailed description.
The present embodiment is under real vehicle state, the engine environment different parts of vehicle are carried out acoustical power test system and
Method.
As depicted in figs. 1 and 2, this test system includes：Noise transducer 4 (6, its arrangement is as shown in Figure 3-Figure 5), arteries and veins
Rush signal transducer 5, signal collecting device and fixed support, noise transducer 4 is arranged on fixed support, and fixed support is placed in
Vehicle acoustical power detected part, Pluse signal sensor 5 is arranged at vehicle crank shaft pulley position, noise transducer 4 and arteries and veins
Rush signal transducer 5 to be all connected with signal collecting device 7 by wire harness 6.
A kind of method of testing using above-mentioned vehicle acoustical power test system, comprises the steps：
Step one, check tested vehicle state, test vehicle is parked on 4 wheel driven revolving drum test table it is ensured that four wheels
Positioned at each rotating hub centre position, after checking vehicle-state, by bandage, vehicle is fixed, its environment noise is less than 20dB, such as Fig. 1
Shown.
Step 2, removal of engine hatchcover, measure power assembly upper surface outer profile size, including length of side l1(x direction),
l2(y direction).
In step 3, the present embodiment, in 6 sensors of power assembly (electromotor) peripheral disposition, and point two-layer arrangement, often
Layer arrangement three；First 6 noise transducers are arranged at different six positions on fixed support, as shown in Figure 3-Figure 5, with
Power assembly upper surface is z=0 plane, and coordinate system is car load coordinate system, and centre of surface point is zero thereon, according to being surveyed
The length of side, calculates noise transducer position, and the coordinate of the first noise transducer 41 to the 6th noise transducer 46 is followed successively by：(-
l1/ 2- Δ x, 0, Δ z1), (0, l2/ 2+ Δ y, Δ z1), (0 ,-l2/ 2- Δ y, Δ z1)、(-l1/ 2- Δ x, l2/ 2+ Δ y, Δ z2)、
(-l1/ 2- Δ x ,-l2/ 2- Δ y, Δ z2), (0,0, Δ z2), calculate noise measuring point envelope size S, then fixed support is placed in
Around the outline of measurement power assembly upper surface；Wherein, Δ x, Δ y are respective sensor hanging down apart from power assembly outline
Straight distance, Δ z1, Δ z2It is the vertical dimension apart from power assembly upper surface for the respective sensor.
In the present embodiment, Δ x=Δ y=1m, Δ z1=0.5m, Δ z2=1m, that is, the first noise transducer 41 make an uproar to the 6th
The coordinate of sonic transducer 46 is followed successively by：(-l1/ 2-1m, 0,0.5m), (0, l2/ 2+1m, 0.5m), (0 ,-l2/ 2-1m, 0.5m), (-
l1/ 2-1m, l2/ 2+1m, 1m), (- l1/ 2-1m ,-l2/ 2-1m, 1m), (0,0,1m), its noise measuring point envelope size S=4l1+
2l2+l1l2+6.
Step 4, starting electromotor, make vehicle operate under different operating modes, when recording above-mentioned 6 noise transducer noises
Numeric field data, the tach signal of recording pulse signal sensor acquisition simultaneously, make an uproar for 6 that are illustrated in figure 6 noise transducer collection
Sound time-domain signal.
Step 5, test data analysis, carry out Fourier transformation to the time domain data of 6 noise transducer records, obtain
The spectrum signal of each measuring point, then passes through formula LW=Lp+ 10lgS calculates acoustical power under different operating modes for the power assembly
Level.
Wherein：LWFor acoustic power level, unit is dB (A)；LpFor test surfaces average sound pressure level, unit is dB (A)；S is to survey
Amount inclusion area, unit is m2.
It is illustrated in figure 7 power assembly acoustic power level under certain operating mode drawing described in thus invention.
In sum, using the test system shown in the present embodiment and method of testing, can be to starting under real vehicle state
The Main Noise Sources of machine different parts carry out acoustical power to be tested, and fully reflects power assembly under real vehicle operating condition
Acoustic power level, compensate for the deficiency in current acoustical power engine bench test；From Fig. 6 and Fig. 7, the present embodiment can obtain effectively
Correction data, it is to automobile development stage and competing product car (inclusion imported vehicle), mark post car (inclusion imported vehicle) noise water
Flat comparison work plays the role of important；Whole system arrangement is convenient, and method of testing is easy to use with data processing method.
The present invention power assembly (electromotor) acoustical power can not only be tested moreover it is possible to vehicle other Main Noise Sources
Acoustical power tested, for example：Exhaust pipe mouth acoustical power, tire acoustical power etc..
Above embodiments of the invention are described in detail, but described content have been only presently preferred embodiments of the present invention,
It is not to be regarded as the practical range for limiting the present invention.All impartial changes made according to the scope of the invention and improvement etc., all should
Still belong within this patent covering scope.
Claims (5)
1. a kind of method of testing of vehicle acoustical power test system it is characterised in that：
Test system, including noise transducer, Pluse signal sensor and signal collecting device, described noise transducer is arranged on
Vehicle acoustical power detected part, described Pluse signal sensor is arranged at vehicle crank shaft pulley position, described noise sensing
Device and Pluse signal sensor are all connected with signal collecting device by wire harness, install one in vehicle acoustical power detected part and are used for
The fixed support of fixed installation noise transducer；
Method of testing comprises the steps：
Step one, test vehicle is parked on 4 wheel driven revolving drum test table it is ensured that four wheels are located at each rotating hub centre position, inspection
After looking into vehicle-state, by bandage, vehicle is fixed；
Step 2, removal of engine hatchcover, measure power assembly upper surface outer profile size, including x direction length of side l1, y direction side
Long l2；
Step 3, in 6 noise transducers of power assembly peripheral disposition, and point two-layer arrangement, arrange three for every layer；First by 6
Noise transducer is arranged at different six positions on fixed support, with power assembly upper surface for z=0 plane, coordinate system
For car load coordinate system, centre of surface point is zero thereon, according to the surveyed length of side, calculates noise transducer position, the
One noise transducer is followed successively by the coordinate of the 6th noise transducer：(-l1/ 2- Δ x, 0, Δ z1), (0, l2/ 2+ Δ y, Δ z1)、
(0 ,-l2/ 2- Δ y, Δ z1)、(-l1/ 2- Δ x, l2/ 2+ Δ y, Δ z2)、(-l1/ 2- Δ x ,-l2/ 2- Δ y, Δ z2), (0,0, Δ
z2), calculate noise measuring point envelope size S, then fixed support is placed in around the outline of measurement power assembly upper surface；Its
In, Δ x, Δ y are the vertical dimensions apart from power assembly outline for the respective sensor, Δ z1, Δ z2It is that respective sensor distance is dynamic
The vertical dimension of power assembly upper surface；
Take Δ x=Δ y=1m, Δ z1=0.5m, Δ z2=1m, i.e. the coordinate of the first noise transducer to the 6th noise transducer
It is followed successively by：(-l1/ 2-1m, 0,0.5m), (0, l2/ 2+1m, 0.5m), (0 ,-l2/ 2-1m, 0.5m), (- l1/ 2-1m, l2/ 2+1m,
1m)、(-l1/ 2-1m ,-l2/ 2-1m, 1m), (0,0,1m), its noise measuring point envelope size S=4l1+2l2+l1l2+6；
Step 4, starting electromotor, make vehicle operate under different operating modes, record above-mentioned noise transducer noise time domain data,
The tach signal of recording pulse signal sensor acquisition simultaneously；
Step 5, test data analysis, carry out time-frequency conversion to the time domain data of corresponding noise transducer record, obtain each measuring point
Spectrum signal, then calculate acoustic power level under different operating modes for the power assembly.
2. vehicle acoustical power test system according to claim 1 method of testing it is characterised in that：Described pulse signal
Sensor is arranged at vehicle crank shaft pulley position, by gathering at this position crankshaft section belt pulley under vehicle difference operating mode
Umber of pulse, and obtain the engine speed corresponding to corresponding operating mode.
3. vehicle acoustical power test system according to claim 1 method of testing it is characterised in that：Described signals collecting
Equipment is with coming the engine rotational speed signal that provided by recording pulse signal sensor and each survey being provided by noise transducer
Noise signal at examination position, then obtains the sound power value of Main Noise Sources under vehicle difference operating mode by post processor.
4. vehicle acoustical power test system according to claim 1 method of testing it is characterised in that：Described step
In, environment noise is less than 20dB.
5. vehicle acoustical power test system according to claim 1 method of testing it is characterised in that：Described step 5
In, Fourier transformation is carried out to the time domain data of noise transducer record, obtains the spectrum signal of each measuring point, by formula LW=
Lp+ 10lgS calculates acoustic power level under different operating modes for the power assembly；LWFor acoustic power level；LpFor the average sound of test surfaces
Arbitrarily downgrade.
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| CN104501937B (en) * | 2014-11-28 | 2017-03-22 | 华晨汽车集团控股有限公司 | Method for testing radiation noise of power assembly of finished vehicle |
| CN105136284A (en) * | 2015-08-24 | 2015-12-09 | 奇瑞汽车股份有限公司 | Automotive blower assembly noise test system and method thereof |
| CN105300696A (en) * | 2015-10-27 | 2016-02-03 | 重庆交通大学 | Quality testing method of sound outside vehicle of middle-engine small van engine in full vehicle quiescent condition |
| CN105699085B (en) * | 2016-01-15 | 2018-07-13 | 重庆长安汽车股份有限公司 | A kind of engine intake Noisy acoustic power test system and test method |
| CN106092615A (en) * | 2016-08-23 | 2016-11-09 | 无锡吉兴汽车声学部件科技有限公司 | Portable vehicle Noise Acquisition system based on LabVIEW |
| DE102017129568A1 (en) * | 2017-12-12 | 2019-06-13 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Method for noise testing of vehicles when driving over a test track |
| CN107860596B (en) * | 2017-12-13 | 2019-06-25 | 西南交通大学 | A kind of vehicle body of railway vehicle air-borne sound path contributions recognition methods |
| CN109405961A (en) * | 2018-10-19 | 2019-03-01 | 中车株洲电力机车有限公司 | A kind of calculation method of floor of railway vehicle structure-borne sound, apparatus and system |
| CN110895166A (en) * | 2018-11-22 | 2020-03-20 | 研祥智能科技股份有限公司 | Automatic noise testing method |
| CN110631842A (en) * | 2019-10-15 | 2019-12-31 | 重庆长安汽车股份有限公司 | Method for testing surface noise source intensity of automobile side window |
| CN111723434B (en) * | 2020-05-26 | 2024-02-13 | 浙江零跑科技股份有限公司 | Electric drive assembly design scheme evaluation method and system based on howling |
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Inventor after: Deng Jianghua Inventor after: Li Hongliang Inventor after: Gao Jidong Inventor after: Gu Cansong Inventor after: Wang Haiyang Inventor after: Chen Daliang Inventor after: Li Can Inventor before: Deng Jianghua Inventor before: Li Hongliang Inventor before: Gu Cansong Inventor before: Wang Haiyang Inventor before: Chen Daliang Inventor before: Li Can |
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Address after: 300000 Tianjin city Dongli District Tianshan Road intersection Cheng linzhuan (Cheng linzhuan Road) Patentee after: China Automotive Technology Research Center Co., Ltd. Address before: 300000 Tianjin city Dongli District Tianshan Road intersection Cheng linzhuan (Cheng linzhuan Road) Patentee before: China Automotive Technology Research Center |
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