CN103115666A - Method of testing and evaluating sound insulation property of finished automobile based on reverberation room - Google Patents
Method of testing and evaluating sound insulation property of finished automobile based on reverberation room Download PDFInfo
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- CN103115666A CN103115666A CN 201210225051 CN201210225051A CN103115666A CN 103115666 A CN103115666 A CN 103115666A CN 201210225051 CN201210225051 CN 201210225051 CN 201210225051 A CN201210225051 A CN 201210225051A CN 103115666 A CN103115666 A CN 103115666A
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Abstract
The invention provides a method testing and evaluating sound insulation property of a finished automobile based on a reverberation room. Stimulating sound pressure sources are arranged at random multiple positions inside the reverberation room. Sound pressure testers are arranged at multiple positions inside the sealed finished automobile. A sound pressure mean square value outside an automobile body inside the reverberation room is calculated to obtain a stimulating sound pressure. A sound pressure mean square value inside the finished automobile is calculated to obtain a receiving sound pressure. A difference between the stimulating sound pressure and the receiving sound pressure is a sound decay. Thus the sound insulation property of the finished automobile is judged.
Description
Technical field
The present invention relates to car load NVH development technique field, be specifically related to the test evaluation of car load sound insulation property.
Background technology
Along with people to environmental protection increasingly pay attention to and to the requirement of Hyundai Motor comfortableness, the auto NVH performance has become affects one of most important index of automobile brand.The quality of car load sound insulation property directly has influence on air-borne sound and is delivered in car outside car, thereby is directly connected to the level of car load NVH.Therefore, the sound insulation property of car load is most important for car load NVH performance.Done a large amount of research about automobile both at home and abroad with the method for testing of sound insulating material, automobile component sound insulation property, relatively less for the evaluation test of car load sound insulation property.
Summary of the invention
The present invention proposes a kind of test method of estimating the sound insulation property of car load based on the reverberation chamber method of testing.Arrange by height diverse location in reverberation chamber, passenger compartment the oise insulation factor that excitation sound source and acoustic pressure tester are tested car load, thereby estimate the car load sound insulation property of different automobile types, optimizing for the acoustics packing of car load provides strong foundation.
The method of the sound insulation property based on reverberation chamber test evaluation car load disclosed by the invention comprises the following steps:
1) in reverberation chamber around arrangement excitation sound source, the excitation sound source apart from the distance of car load and reverberation chamber metope greater than 1.5m;
2) ear place, position of driver left and right, ear place, copilot station left and right, the left ear of player No.5's passenger position place, back right passenger position auris dextra place arranges the acoustic pressure tester in airtight car load crew module;
3) guarantee to encourage sound source to close, ground unrest in the test crew module;
4) open the excitation sound source, regulate excitation source sound size, make to receive acoustic pressure in the crew module greater than predetermined value of ground unrest; Test simultaneously and receive the acoustic pressure mean square value in reverberation chamber underexcitation acoustic pressure mean square value and crew module;
5) reverberation chamber underexcitation acoustic pressure mean square value is deducted reception acoustic pressure mean square value acquisition sound attenuating amount in the crew module.
Excitation acoustic pressure of the present invention refers to the acoustic pressure in reverberation chamber, obtains by the acoustic pressure mean square value (decibel value) of testing any 6 positions in reverberation chamber.These 6 positions are around arrangement, and greater than 1.5m, these 6 position measuring point height differ, the sound pressure level of diverse location differing heights in the test reverberation chamber apart from the distance of car load and reverberation chamber metope; This method of testing is simple, can reflect the sound insulation property level of car load.It is characterized in that, this evaluation method is to carry out in reverberation chamber, by acoustic pressure in acoustic pressure and crew module in the test reverberation chamber, gets its difference, obtains the car load oise insulation factor, is used for estimating the sound insulation property level of car load.
Description of drawings
Fig. 1 is that reverberation chamber is surveyed car load sound insulation property process flow diagram;
Fig. 2 is the arrangenent diagram of car load in reverberation chamber, sound source.
Embodiment
Reverberation chamber shown in Figure 1 is surveyed the flow process of car load sound insulation property, and test vehicle must keep totally, and needs to check whether breakage is arranged.Need car load is carried out air-tight test before carrying out this test, the sealing of warranty test vehicle is in normal level, without significantly leaking.
Arrangement position shown in Figure 2 within car load is positioned over reverberation chamber, guarantee that car load is in the middle of reverberation chamber, and the distance between each metope of reverberation chamber is greater than 1.5m.
Sound source position shown in Figure 2 will encourage sound source to be positioned in reverberation chamber, and after guaranteeing to encourage the sound source sounding, the reverberation room sound field is even.
Reverberation chamber microphone position shown in Figure 2,6 reverberation field microphones of the car load arranged around in reverberation chamber, these 6 measuring point height differ, apart from the distance of car load and reverberation chamber wall greater than 1.5m.
The position of microphone in crew module shown in Figure 2, arrange 6 reverberation field microphones the crew module, these 6 point positions are as follows: ear place, position of driver left and right (FLL, FLR), ear place, copilot station left and right (FRL, FRR), the left ear of player No.5's passenger position place (RLL), back right passenger position auris dextra place (RRR).
Reverberation chamber shown in Figure 1 is surveyed car load sound insulation flow process, after having demarcated microphone.Open circulation in car load, and close door-window.Open the excitation sound source, the regulating power amplifier guarantees that the interior excitation acoustic pressure of reverberation chamber is greater than 110dB.
Reverberation chamber shown in Figure 1 is surveyed car load sound insulation flow process, after the sound source adjusting is complete, and the ground unrest in the test crew module.Then open sound source, the acoustic pressure of 6 measuring points in interior 6 measuring points of test reverberation chamber and crew module.Signal to noise ratio (S/N ratio) to 6 measuring points in the crew module is analyzed, and guarantees that crew module's build-in test acoustic pressure is greater than more than ground unrest 10dB.
Reverberation chamber shown in Figure 1 is surveyed car load sound insulation flow process, and the sound pressure level that 6 microphones in reverberation chamber are recorded averages processing, obtains encouraging acoustic pressure SPL
SourceThe sound pressure level that 6 microphones of crew module are recorded averages processing, obtains receiving acoustic pressure SPL
ReceiverThe oise insulation factor of car load (sound attenuating amount) NR carries out computing according to following formula,
NR=SPL
source?-?SPL
receiver
In formula, NR-sound attenuating amount, i.e. oise insulation factor;
SPL
Source-excitation acoustic pressure, the acoustic pressure mean value (decibel value) of 6 measuring points in reverberation chamber;
SPL
Receiver-receive acoustic pressure, the acoustic pressure mean value (decibel value) of 6 measuring points in the crew module.
Claims (1)
1. based on the method for the sound insulation property of reverberation chamber test evaluation car load, comprise the following steps:
1) in reverberation chamber around arrangement excitation sound source, the excitation sound source apart from the distance of car load and reverberation chamber metope greater than 1.5m;
2) ear place, position of driver left and right, ear place, copilot station left and right, the left ear of player No.5's passenger position place, back right passenger position auris dextra place arranges the acoustic pressure tester in airtight car load crew module;
3) guarantee to encourage sound source to close, ground unrest in the test crew module;
4) open the excitation sound source, regulate excitation source sound size, make to receive acoustic pressure in the crew module greater than predetermined value of ground unrest; Test simultaneously and receive the acoustic pressure mean square value in reverberation chamber underexcitation acoustic pressure mean square value and crew module;
5) reverberation chamber underexcitation acoustic pressure mean square value is deducted reception acoustic pressure mean square value acquisition sound attenuating amount in the crew module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210225051 CN103115666A (en) | 2012-07-03 | 2012-07-03 | Method of testing and evaluating sound insulation property of finished automobile based on reverberation room |
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| CN 201210225051 CN103115666A (en) | 2012-07-03 | 2012-07-03 | Method of testing and evaluating sound insulation property of finished automobile based on reverberation room |
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| CN103115666A true CN103115666A (en) | 2013-05-22 |
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| CN105203198A (en) * | 2015-09-15 | 2015-12-30 | 南京大学 | Method for measuring reverberation time of reverberation room |
| CN106679797A (en) * | 2016-11-16 | 2017-05-17 | 中国电力科学研究院 | Paralleling-reactor sound-shield sound reduction measuring method and device |
| 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 |
| CN108760889A (en) * | 2018-03-01 | 2018-11-06 | 江铃汽车股份有限公司 | Automotive floor panel utters long and high-pitched sounds air radiation acoustical damping properties recognition methods to rear axle |
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| CN109596211A (en) * | 2018-12-26 | 2019-04-09 | 重庆长安汽车股份有限公司 | A kind of automobile wind is made an uproar cavity sounding method for testing |
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| CN113790900A (en) * | 2021-08-11 | 2021-12-14 | 岚图汽车科技有限公司 | Vehicle sound insulation performance testing method and device and electronic equipment |
| CN114113333A (en) * | 2020-08-28 | 2022-03-01 | 上海汽车集团股份有限公司 | Method and related device for testing sound insulation performance of whole vehicle |
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| CN114720150A (en) * | 2022-03-30 | 2022-07-08 | 襄阳达安汽车检测中心有限公司 | Test method and test system for sound insulation performance of whole vehicle |
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-
2012
- 2012-07-03 CN CN 201210225051 patent/CN103115666A/en active Pending
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| CN106679797A (en) * | 2016-11-16 | 2017-05-17 | 中国电力科学研究院 | Paralleling-reactor sound-shield sound reduction measuring method and device |
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| CN109307711B (en) * | 2018-11-28 | 2022-01-25 | 中车长春轨道客车股份有限公司 | Train through passage sound insulation performance test method based on reverberation chamber and anechoic chamber |
| CN109307711A (en) * | 2018-11-28 | 2019-02-05 | 中车长春轨道客车股份有限公司 | Train run-through channel sound insulation property test method based on reverberation chamber and anechoic room |
| CN109596211A (en) * | 2018-12-26 | 2019-04-09 | 重庆长安汽车股份有限公司 | A kind of automobile wind is made an uproar cavity sounding method for testing |
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Application publication date: 20130522 |