CN103994892A - 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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- CN103994892A CN103994892A CN201410186769.7A CN201410186769A CN103994892A CN 103994892 A CN103994892 A CN 103994892A CN 201410186769 A CN201410186769 A CN 201410186769A CN 103994892 A CN103994892 A CN 103994892A
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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 macro 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, the power assembly that acoustical power is high, it is corresponding higher to noise effect inside and outside car, so not only can affect the noise comfortableness in car, also can have influence on meeting of pass-by noise GB level.In order to obtain lower noise level, must impose more sound absorption processing to it.Current power assembly acoustical power is tested still mainly taking bench test as main, is difficult to like this meet actual operating state and the load level of automobile, simultaneously for being also difficult to implement with the lateral comparison of competing product car and mark post car.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of System and method for that can measuring vehicle acoustical power.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of vehicle acoustical power test macro, comprise 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 on vehicle crank pulley position, and described noise transducer is all connected with signal collecting device by wire harness with Pluse signal sensor.
Further, described noise transducer is provided with several, is arranged in the acoustical power position to be measured of power assembly, is used for gathering the noise signal of corresponding position.
Further, described Pluse signal sensor is arranged on vehicle crank pulley position, by gathering the umber of pulse of this position crankshaft section belt pulley under the different operating modes of vehicle, and obtains corresponding engine speed described in corresponding operating mode.
Further, the noise signal at the engine rotational speed signal that described signal collecting device provides with cause recording pulse signal sensor and each test position place of being provided by noise transducer, then obtains the sound power value of Main Noise Sources under the different operating modes of vehicle by post processor.
Further, install one in vehicle acoustical power detected part and be used for fixing the fixed support that noise transducer is installed.
A method of testing of utilizing above-mentioned vehicle acoustical power test macro, comprises the steps:
Step 1, testing vehicle is parked on 4 wheel driven revolving drum test table, guarantees that four wheels are positioned at and respectively turn hub centre position, check vehicles after 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 around the outline of power assembly upper surface to be measured; Or first fixed support is placed in around the outline of the upper surface of measuring power assembly, then several noise transducers are arranged on fixed support;
Step 4, pilot engine, vehicle is turned round under different operating modes, record above-mentioned noise transducer noise time domain data, the tach signal that recording pulse signal sensor gathers simultaneously;
Step 5, test data analysis, carry out time-frequency conversion to the time domain data of corresponding noise transducer record, obtains the spectrum signal of each measuring point, then calculates the sound power level of power assembly under different operating modes.
Further, in described step 1, neighbourhood noise is lower than 20dB.
Further, in described step 2, measure power assembly upper surface outline and become and comprise the length and width length of side.
Further, in described step 3, several noise transducers are arranged on to diverse location place on fixed support, taking power assembly upper surface as z=0 plane, coordinate is car load coordinate system, and its upper surface central point is true origin, according to the surveyed length of side, calculate each noise transducer position, thus calculating noise measuring point envelope size S.
Further, in described step 5, the time domain data of noise transducer record is carried out to Fourier transform, obtain the spectrum signal of each measuring point, by formula L
w=L
p+ 10lgS calculates the sound power level of power assembly under different operating modes.
Advantage and good effect that the present invention has are: the present invention can carry out acoustical power to the Main Noise Sources of its different parts and test under real vehicle state, for example: power assembly (engine) acoustical power, exhaust pipe mouth acoustical power, tire acoustical power etc., fully reflect the acoustical power level of Main Noise Sources under real vehicle operating condition, made up the deficiency in current acoustical power engine bench test; The present invention can obtain effective correlation data, and its comparison work to automobile development stage and competing product car (comprising imported vehicle), mark post car (comprising imported vehicle) noise level has important effect; Whole system arrangement convenience, method of testing and data processing method are simple and easy to use.
Brief description of the drawings
Fig. 1 is that testing vehicle is parked in the schematic diagram on 4 wheel driven revolving drum test table;
Fig. 2 is power assembly acoustical power test macro connection diagram;
Fig. 3 is that power assembly acoustical power test noise sensor front view is arranged schematic diagram;
Fig. 4 is that in Fig. 3, noise transducer is arranged schematic diagram right view;
Fig. 5 is that in Fig. 3, noise transducer is arranged schematic diagram vertical view;
Fig. 6 is the embodiment of the present invention noise spectrum signal that each noise transducer measuring point gathers under certain operating mode;
Fig. 7 is the power assembly sound 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.
Embodiment
For to the more deep understanding of the present invention, enumerate a specific embodiment below, and by reference to the accompanying drawings, the present invention is described in further detail.
The present embodiment is under real vehicle state, and different parts around the engine of vehicle is carried out to acoustical power test macro and method.
As depicted in figs. 1 and 2, this test macro comprises: (6 of noise transducers 4, it is arranged as shown in Figure 3-Figure 5), Pluse signal sensor 5, signal collecting device and fixed support, noise transducer 4 is arranged on fixed support, fixed support is placed in vehicle acoustical power detected part, Pluse signal sensor 5 is arranged on vehicle crank pulley position, and noise transducer 4 is all connected with signal collecting device 7 by wire harness 6 with Pluse signal sensor 5.
A method of testing of utilizing above-mentioned vehicle acoustical power test macro, comprises the steps:
Step 1, check tested vehicle state, testing vehicle is parked on 4 wheel driven revolving drum test table, guarantee that four wheels are positioned at and respectively turn hub centre position, check vehicles after state, by bandage, vehicle is fixed, its neighbourhood noise is lower than 20dB, as shown in Figure 1.
Step 2, removal of engine hatchcover, measure power assembly upper surface outer profile size, comprises length of side l
1(x direction), l
2(y direction).
In step 3, the present embodiment, at 6 sensors of power assembly (engine) peripheral disposition, and point two-layer layout, arrange three for every layer; First 6 noise transducers are arranged on to six positions different on fixed support, as shown in Figure 3-Figure 5, taking power assembly upper surface as z=0 plane, coordinate is car load coordinate system, its upper surface central point is true origin, according to the surveyed length of side, calculating noise sensor position, the first noise transducer 41 to the coordinate of the 6th noise transducer 46 is followed successively by: (l
1/ 2-Δ x, 0, Δ z
1), (0, l
2/ 2+ Δ y, Δ z
1), (0 ,-l
2/ 2-Δ y, Δ z
1), (l
1/ 2-Δ x, l
2/ 2+ Δ y, Δ z
2), (l
1/ 2-Δ x ,-l
2/ 2-Δ y, Δ z
2), (0,0, Δ z
2), calculating noise measuring point envelope size S, is then placed in fixed support around the outline of measuring power assembly upper surface; Wherein, Δ x, Δ y is the vertical range of respective sensor apart from power assembly outline, Δ z
1, Δ z
2the vertical range of respective sensor apart from power assembly upper surface.
In the present embodiment, Δ x=Δ y=1m, Δ z
1=0.5m, Δ z
2=1m, the first noise transducer 41 to the coordinate of the 6th noise transducer 46 is followed successively by: (l
1/ 2-1m, 0,0.5m), (0, l
2/ 2+1m, 0.5m), (0 ,-l
2/ 2-1m, 0.5m), (l
1/ 2-1m, l
2/ 2+1m, 1m), (l
1/ 2-1m ,-l
2/ 2-1m, 1m), (0,0,1m), its noise measuring point envelope size S=4l
1+ 2l
2+ l
1l
2+ 6.
Step 4, pilot engine, vehicle is turned round under different operating modes, record above-mentioned 6 noise transducer noise time domain datas, the tach signal that recording pulse signal sensor gathers simultaneously, is illustrated in figure 66 noise time-domain signals that noise transducer gathers.
Step 5, test data analysis, carry out Fourier transform to the time domain data of 6 noise transducer records, obtains the spectrum signal of each measuring point, then by formula L
w=L
p+ 10lgS calculates the sound power level of power assembly under different operating modes.
Wherein: L
wfor sound power level, unit is dB (A); L
pfor test surfaces average sound pressure level, unit is dB (A); S is for measuring inclusion area, and unit is m
2.
Be illustrated in figure 7 power assembly sound power level under certain operating mode drawing described in inventing thus.
In sum, utilize the test macro shown in the present embodiment and method of testing, can under real vehicle state, carry out acoustical power to the Main Noise Sources of engine different parts tests, fully reflect the acoustical power level of power assembly under real vehicle operating condition, made up the deficiency in current acoustical power engine bench test; From Fig. 6 and Fig. 7, the present embodiment can obtain effective correlation data, and its comparison work to automobile development stage and competing product car (comprising imported vehicle), mark post car (comprising imported vehicle) noise level has important effect; Whole system arrangement convenience, method of testing and data processing method are simple and easy to use.
The present invention can not only test power assembly (engine) acoustical power, can also test the acoustical power of other Main Noise Sources of vehicle, for example: exhaust pipe mouth acoustical power, tire acoustical power etc.
Above embodiments of the invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variation and improvement etc. of doing according to the scope of the invention, within all should still belonging to this patent covering scope.
Claims (10)
1. a vehicle acoustical power test macro, it is characterized in that: comprise 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 on vehicle crank pulley position, and described noise transducer is all connected with signal collecting device by wire harness with Pluse signal sensor.
2. vehicle acoustical power test macro according to claim 1, is characterized in that: described noise transducer is provided with several, is arranged in the acoustical power position to be measured of power assembly, is used for gathering the noise signal of corresponding position.
3. vehicle acoustical power test macro according to claim 1, it is characterized in that: described Pluse signal sensor is arranged on vehicle crank pulley position, by gathering the umber of pulse of this position crankshaft section belt pulley under the different operating modes of vehicle, and obtain corresponding engine speed described in corresponding operating mode.
4. vehicle acoustical power test macro according to claim 1, it is characterized in that: the noise signal at the engine rotational speed signal that described signal collecting device cause recording pulse signal sensor provides and the each test position place being provided by noise transducer, then obtains the sound power value of Main Noise Sources under the different operating modes of vehicle by post processor.
5. according to the vehicle acoustical power test macro described in claim 1-4 any one, it is characterized in that: install one in vehicle acoustical power detected part and be used for fixing the fixed support that noise transducer is installed.
6. a method of testing of utilizing the vehicle acoustical power test macro described in claim 5, comprises the steps:
Step 1, testing vehicle is parked on 4 wheel driven revolving drum test table, guarantees that four wheels are positioned at and respectively turn hub centre position, check vehicles after 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 around the outline of power assembly upper surface to be measured; Or first fixed support is placed in around the outline of the upper surface of measuring power assembly, then several noise transducers are arranged on fixed support;
Step 4, pilot engine, vehicle is turned round under different operating modes, record above-mentioned noise transducer noise time domain data, the tach signal that recording pulse signal sensor gathers simultaneously;
Step 5, test data analysis, carry out time-frequency conversion to the time domain data of corresponding noise transducer record, obtains the spectrum signal of each measuring point, then calculates the sound power level of power assembly under different operating modes.
7. method of testing according to claim 6, is characterized in that: in described step 1, neighbourhood noise is lower than 20dB.
8. method of testing according to claim 6, is characterized in that: in described step 2, measure power assembly upper surface outline and become and comprise the length and width length of side.
9. according to the method for testing described in claim 6 or 8, it is characterized in that: in described step 3, several noise transducers are arranged on to diverse location place on fixed support, taking power assembly upper surface as z=0 plane, coordinate is car load coordinate system, and its upper surface central point is true origin, according to the surveyed length of side, calculate each noise transducer position, thus calculating noise measuring point envelope size S.
10. method of testing according to claim 9, is characterized in that: in described step 5, the time domain data of noise transducer record is carried out to Fourier transform, obtain the spectrum signal of each measuring point, by formula L
w=L
p+ 10lgS calculates the sound power level of power assembly under different operating modes.
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|---|---|---|---|
| CN201410186769.7A CN103994892B (en) | 2014-05-05 | 2014-05-05 | Test system for vehicle acoustical power and test method thereof |
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|---|---|---|---|
| CN201410186769.7A CN103994892B (en) | 2014-05-05 | 2014-05-05 | Test system for vehicle acoustical power and test method thereof |
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| CN103994892B CN103994892B (en) | 2017-02-15 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501937A (en) * | 2014-11-28 | 2015-04-08 | 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 |
| CN105699085A (en) * | 2016-01-15 | 2016-06-22 | 重庆长安汽车股份有限公司 | Engine air inlet noise sound power test system and test method thereof |
| 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 |
| CN107860596A (en) * | 2017-12-13 | 2018-03-30 | 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 |
| CN109959519A (en) * | 2017-12-12 | 2019-07-02 | 保时捷股份公司 | Method for carrying out noise testing to the vehicle travelled on test segment |
| 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 |
| CN110895166A (en) * | 2018-11-22 | 2020-03-20 | 研祥智能科技股份有限公司 | Automatic noise testing method |
| CN111723434A (en) * | 2020-05-26 | 2020-09-29 | 浙江零跑科技有限公司 | Howling-based electric drive assembly design scheme evaluation method and system |
| CN112254978A (en) * | 2020-09-09 | 2021-01-22 | 交通运输部公路科学研究所 | Method for measuring and evaluating passing noise source intensity and directivity of vehicle |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104501937A (en) * | 2014-11-28 | 2015-04-08 | 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 |
| CN105699085A (en) * | 2016-01-15 | 2016-06-22 | 重庆长安汽车股份有限公司 | Engine air inlet noise sound power test system and test method thereof |
| 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 |
| CN109959519A (en) * | 2017-12-12 | 2019-07-02 | 保时捷股份公司 | Method for carrying out noise testing to the vehicle travelled on test segment |
| CN107860596A (en) * | 2017-12-13 | 2018-03-30 | 西南交通大学 | A kind of vehicle body of railway vehicle air-borne sound path contributions recognition methods |
| 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 |
| CN111723434A (en) * | 2020-05-26 | 2020-09-29 | 浙江零跑科技有限公司 | Howling-based electric drive assembly design scheme evaluation method and system |
| 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 |
| CN112254978A (en) * | 2020-09-09 | 2021-01-22 | 交通运输部公路科学研究所 | Method for measuring and evaluating passing noise source intensity and directivity of vehicle |
| CN112254978B (en) * | 2020-09-09 | 2022-05-17 | 交通运输部公路科学研究所 | Method for measuring and evaluating passing noise source intensity and directivity of vehicle |
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