CN101949775B - Measuring method of ground reflection noise source - Google Patents
Measuring method of ground reflection noise source Download PDFInfo
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- CN101949775B CN101949775B CN2010102570020A CN201010257002A CN101949775B CN 101949775 B CN101949775 B CN 101949775B CN 2010102570020 A CN2010102570020 A CN 2010102570020A CN 201010257002 A CN201010257002 A CN 201010257002A CN 101949775 B CN101949775 B CN 101949775B
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- 238000009530 blood pressure measurement Methods 0.000 claims description 3
- 238000013519 translation Methods 0.000 claims description 3
- 238000001093 holography Methods 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 4
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Abstract
The present invention provides a simple and effective measuring method of a ground reflection noise source, which has low measuring cost. The measuring method comprises the following steps: A, supporting a finished automobile by hoisting equipment; B, stabilizing the operation working condition of the automobile at the state to be tested; C, horizontally placing a baffle board below an automobile body, wherein a gap between the baffle board and a chassis is same with a gap between a base plate and the finished automobile when the finished automobile is naturally placed on the ground; translating the baffle board along the length direction of the automobile body; meanwhile, utilizing noise measuring equipment arranged in an automobile chamber to measure noise in the automobile chamber; according to the acoustic pressure level characteristic of attention noise in the automobile when the baffle board is on different positions, determining the main noise resource of noise reflected into the automobile by the baffle board. The measuring method of the ground reflection noise source of the invention can quickly measure the main noise resource of noise reflected into the automobile from ground by simple equipment. Compared with the traditional phonometry or acoustical holography method which is used for determining acoustic source, the measuring method of the invention has simple operation and low measuring cost.
Description
Technical field
The invention belongs to the Automobile Design technical field, specially refer to the measuring method of ground return noise source.
Background technology
The comfortableness of automobile is one of factor of valuing most of consumer, and internal car noise is directly connected to the NVH performance of automobile, has influence on passenger's comfort level.Along with the car load legislations for noise limits more and more strictness and the client is more and more higher to the requirement of automobile noise, reduce the car load room noise, raising sound quality has become inexorable trend.Internal car noise source has a lot, and for example nacelle, tire are made an uproar etc., in addition, also very important through ground return to the noise in the car, the airborne noise of medium and low frequency is indoor to car through ground return when especially quickening, and might cause the roar that car is indoor, thereby cause client's complaint.Has only the noise source of having confirmed that car is indoor, could solve noise problem targetedly, improve comfort level, therefore, be necessary to propose a kind ofly to determine that through the measuring method of ground return though at present have sound intensity technique or acoustical holography method can determine noise source, the test facilities of said method and equipment is costliness very to internal car noise overriding noise source, testing cost is higher, is difficult to popularize.
Summary of the invention
The objective of the invention is to propose a kind of simple and easy effectively, the measuring method of ground return noise source that testing cost is cheap.
The measuring method of ground return noise source of the present invention comprises the steps:
A: utilize lifting equipment that car load is held up;
B: the operating condition of automobile is stabilized in state to be tested;
C: reflecting plate is placed horizontally at the vehicle body below, the gap on ground and chassis was identical when reflecting plate should be positioned over ground with car load naturally apart from the gap, chassis, and with reflecting plate along the translation of vehicle body fore-and-aft direction, utilize simultaneously to be positioned over the indoor noise measuring equipment of car and to measure the indoor noise of car, determine through baffle reflection to the internal car noise main noise source according to paying close attention to the noise sound characteristic in the car of reflecting plate when the different positions.
In the process of measuring noise, the car load picking-up can be reduced the ground return interference of noise, make measurement more accurate.Simulate ground and adopt than the reflecting plate of small size, can find noise source more accurately, thereby improve targetedly.
For reducing the ground return interference of noise, in the above-mentioned A step, utilize lifting equipment that car load is held up at least 1.5 meters high.
At first noise measuring equipment is demarcated before the measurement, to guarantee that measurement accurately with acoustic calibrator.
Described reflecting plate is preferably rectangle, and it is of a size of 0.5 meter of automobile wheel track *, like this can be more convenient, determine the position of noise source more accurately, reflecting plate oversize or too small all can make measure not accurate enough.
The surface of described reflecting plate is preferably the material of concrete or bituminous pavement, so that the reflection follow-up post of noise is bordering on actual conditions.
Described noise measuring equipment comprises 1 sound pressure measurement passage at least, and its microphone is preferably the microphone of omnidirectional, to guarantee that measurement accurately.
The simple equipment of measuring method utilization of ground return noise source of the present invention can be measured through ground return fast to internal car noise overriding noise source, determine that with traditional sound intensity technique or acoustical holography method the sound source method compares, operate simplyr, testing cost is also cheaper.
Description of drawings
Fig. 1 is the principle schematic of the measuring method of ground return noise source of the present invention.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiments and the drawings.
Embodiment 1:
The measuring method of the ground return noise source of present embodiment comprises the steps:
A: utilize lifting machine 3 that car load 1 is held up at least 1.5 meters high;
B: the operating condition of automobile is stabilized in state to be tested, promptly the comparatively tangible operating mode of the noise problem of paying close attention to;
C: reflecting plate 4 is placed horizontally at the vehicle body below, the gap on ground and chassis was identical when reflecting plate 4 should be positioned over ground with car load naturally apart from the gap, chassis, and reflecting plate 4 carried out repeatedly translation along the vehicle body fore-and-aft direction, utilize simultaneously to be positioned over the indoor noise measuring equipment of car 2 and to measure the indoor noise of cars, determine through baffle reflection to the internal car noise main noise source according to paying close attention to the noise sound characteristic in the car of reflecting plate 4 when the different positions.
At first noise measuring equipment 2 is demarcated before the measurement, to guarantee that measurement accurately with acoustic calibrator.
Reflecting plate 4 is a rectangle, and it is of a size of 0.5 meter of automobile wheel track *, like this can be more convenient, determine the position of noise source more accurately, reflecting plate 4 oversize or too small all can make measure not accurate enough.
Claims (7)
1. the measuring method of a ground return noise source is characterized in that comprising the steps:
A: utilize lifting equipment that car load is held up;
B: the operating condition of automobile is stabilized in state to be tested;
C: reflecting plate is placed horizontally at the vehicle body below, the gap on ground and chassis was identical when reflecting plate should be positioned over ground with car load naturally apart from the gap, chassis, and with reflecting plate along the translation of vehicle body fore-and-aft direction, utilize simultaneously to be positioned over the indoor noise measuring equipment of car and to measure the indoor noise of car, determine through baffle reflection to the internal car noise main noise source according to paying close attention to the noise sound characteristic in the car of reflecting plate when the different positions.
2. the measuring method of ground return noise source according to claim 1 is characterized in that in the A step, utilizes lifting equipment that car load is held up at least 1.5 meters high.
3. the measuring method of ground return noise source according to claim 1 is at first demarcated noise measuring equipment with acoustic calibrator before it is characterized in that measuring.
4. according to the measuring method of claim 1 or 2 or 3 described ground return noise sources, it is characterized in that described reflecting plate is a rectangle, it is of a size of 0.5 meter of automobile wheel track *.
5. the measuring method of ground return noise source according to claim 4, the surface that it is characterized in that described reflecting plate is the material of concrete or bituminous pavement.
6. according to the measuring method of claim 1 or 2 or 3 described ground return noise sources, it is characterized in that described noise measuring equipment comprises 1 sound pressure measurement passage at least.
7. the measuring method of ground return noise source according to claim 6, the microphone that it is characterized in that described noise measuring equipment is the microphone of omnidirectional.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102570020A CN101949775B (en) | 2010-08-17 | 2010-08-17 | Measuring method of ground reflection noise source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102570020A CN101949775B (en) | 2010-08-17 | 2010-08-17 | Measuring method of ground reflection noise source |
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| Publication Number | Publication Date |
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| CN101949775A CN101949775A (en) | 2011-01-19 |
| CN101949775B true CN101949775B (en) | 2011-12-14 |
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| CN2010102570020A Active CN101949775B (en) | 2010-08-17 | 2010-08-17 | Measuring method of ground reflection noise source |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175699B (en) * | 2011-12-23 | 2015-08-19 | 南车青岛四方机车车辆股份有限公司 | Rail vehicle noise transmission approach method of testing |
| CN103630232B (en) * | 2013-10-29 | 2017-10-31 | 中车青岛四方机车车辆股份有限公司 | A kind of EMU Noise Sources Identification method of testing |
| CN104062075B (en) * | 2014-07-04 | 2016-09-14 | 奇瑞汽车股份有限公司 | A kind of car load sound transmission loss method of testing |
| CN108375758B (en) * | 2018-02-05 | 2020-05-19 | 华中科技大学 | Mirror image synthetic aperture radiometer error correction method based on external single-point source |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3715016C1 (en) * | 1987-05-06 | 1988-12-01 | Daimler Benz Ag | Noise test stand for motor vehicles |
| US7240544B2 (en) * | 2004-12-22 | 2007-07-10 | Daimlerchrysler Corporation | Aerodynamic noise source measurement system for a motor vehicle |
| CN101038698A (en) * | 2006-03-14 | 2007-09-19 | 上海大众汽车有限公司 | Date collecting method for measuring automobile external noise |
| CN201666815U (en) * | 2009-10-23 | 2010-12-08 | 江苏省交通科学研究院股份有限公司 | Integrated test system for automobile noise |
-
2010
- 2010-08-17 CN CN2010102570020A patent/CN101949775B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3715016C1 (en) * | 1987-05-06 | 1988-12-01 | Daimler Benz Ag | Noise test stand for motor vehicles |
| US7240544B2 (en) * | 2004-12-22 | 2007-07-10 | Daimlerchrysler Corporation | Aerodynamic noise source measurement system for a motor vehicle |
| CN101038698A (en) * | 2006-03-14 | 2007-09-19 | 上海大众汽车有限公司 | Date collecting method for measuring automobile external noise |
| CN201666815U (en) * | 2009-10-23 | 2010-12-08 | 江苏省交通科学研究院股份有限公司 | Integrated test system for automobile noise |
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| CN101949775A (en) | 2011-01-19 |
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