CN104266749A - Device and method for offline detecting NVH (Noise Vibration and Harshness) of vehicle generator - Google Patents
Device and method for offline detecting NVH (Noise Vibration and Harshness) of vehicle generator Download PDFInfo
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- CN104266749A CN104266749A CN201410576755.6A CN201410576755A CN104266749A CN 104266749 A CN104266749 A CN 104266749A CN 201410576755 A CN201410576755 A CN 201410576755A CN 104266749 A CN104266749 A CN 104266749A
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Abstract
The invention discloses a device for offline detecting the NVH (Noise Vibration and Harshness) of a vehicle generator. The device is characterized by comprising a sound insulation cabin, a detecting platform, a driving end, a belt tensioning mechanism and an acoustic collection analysis system, wherein the driving end is positioned in a sound insulation box. The invention further discloses a method for offline detecting the NVH of the vehicle generator. The device is adopted in the method. A generator to be detected is arranged in the closed sound insulation cabin, then the generator to be detected is driven to simulate the operation of work through the driving end positioned in the sound insulation box, the acoustical signals of the operation of the generator are collected by adopting a sound pressure sensor, then the signals are transmitted to an earphone and are converted into sound judged and detected by the auditory sense of an operator, and/or the signals are transmitted to a central control computer for contrast judgment and detection. The device is simple and compact in structure, convenient to manufacture and mount, flexible and adjustable, the method is good in test dynamic, test data are truthful, accurate and high in precision, and the device the advantages of good reliability, lower cost and the like.
Description
Technical field
The present invention relates to a kind of method of alternator for vehicle NVH off-line test and corresponding pick-up unit.
Background technology
NVH is noise, vibration and the english abbreviation of sound vibration roughness (Noise, Vibration, Harshness).This is the global question weighing automobile making quality, and it is the most direct and most surface to the impression of user vehicle.The NVH problem of vehicle is one of problem of international automobile Ye Ge great car load manufacturing enterprise and parts enterprises concern.Have statistical data to show, car load about has the failure problems of 1/3 to be have relation with the NVH problem of vehicle, and there is the R & D Cost consumption of nearly 20% in each major company in the NVH problem solving vehicle.
In auto NVH, have very major part to be that generator causes, automobile be in startup, idling or halted state time, occupant clearly can hear that alternator sends quite high, the ear-piercing especially cry of hissing of a kind of frequency.Therefore NVH research is carried out to automobile current generator, be beneficial to eliminate auto NVH, just seem necessary.
Each generator enterprise rests on testing laboratory's stage to generator NVH research, in testing laboratory, Measurement and analysis is carried out to the generator of NVH problem that has that client feedback is returned, find out the problem causing NVH, the short run model machine produced after rectification does not have NVH quality problems, but still there are NVH quality problems in the product produced in enormous quantities out, main cause is in alternator for vehicle batch production process, because part quality is difficult to accurate control, assembly quality cannot accurately control, cause alternator for vehicle difficult quality overall the control of producing in batches, therefore, necessary to alternator for vehicle NVH off-line test.
At present, in prior art both at home and abroad for alternator for vehicle NVH off-line test, one is arranged on car load by generator, hang neutral, closed door and vehicle window, driver's listening in car judges the quality of generator, and another kind of method adopts drive unit drive electrical generators to rotate, generator housing arranges vibration transducer, is judged the NVH quality of generator by vibration signal.First method accuracy is not high, and test setup time is long; Second method judges by vibrating, and cannot get rid of the interference that drive end vibration signal vibrates generator itself, and laboratory technician also cannot by the quality of vibration values subjective assessment generator sound.
Therefore how to design a kind of new detection technique, and make it can be direct, record alternator for vehicle noise figure rapidly, can subjective assessment engine NVH quality, also objectively can judge whether noise figure reaches requirement of dispatching from the factory, become the problem needing to consider to solve.
Summary of the invention
For above-mentioned the deficiencies in the prior art, technical matters to be solved by this invention is: how to provide one can be direct, record alternator for vehicle noise figure rapidly, can subjective assessment engine NVH quality, also can objectively judge engine NVH whether reach dispatch from the factory require alternator for vehicle NVH off-line test devices and methods therefor; Make it have test data true and accurate, precision is high; The structure of the detecting device form adopted is simple, adjustable flexibly, and test performance is good, the features such as cost is lower.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
A kind of alternator for vehicle NVH off-line test device, is characterized in that, comprise
Sound insulation bin, sound insulation bin is box typed structure and for the interference of isolated external voice, sound insulation bin is provided with soundproof door;
Monitor station, described monitor station is positioned at sound insulation bin, and monitor station upper surface is provided with the mount pad for installing generator to be detected;
Drive end, described drive end comprises a soundproof box be positioned at below monitor station, a kinetic servo motor (preferably adopting the water-cooled servomotor of low noise) is provided with in soundproof box, kinetic servo motor output shaft is connected by shaft coupling (preferred rubber shaft coupling) level with a transmission shaft, transmission shaft level is arranged on a bearing seat, and transmission shaft one end is extended soundproof box rotationally and had belt pulley at soundproof box extenal fixation; The output wheel of belt pulley and the generator to be detected after being installed on mount pad is oppositely arranged and leaves for installing driving belt in space between the two on monitor station;
Belt tensioning mechanism, the tensioning of described belt tensioning mechanism between belt pulley and the output wheel of the generator to be detected after being installed on mount pad and for realizing driving belt;
Acoustics acquisition analysis system, described acoustics acquisition analysis system comprises the sound pressure sensor be positioned at around sound insulation bin generator, sound pressure sensor is connected with data collecting card, and data collecting card is connected with the earphone and/or control computer being arranged in sound insulation bin outside by data line.
The invention also discloses a kind of alternator for vehicle NVH off-line test method, even if by above-mentioned detection device, generator to be detected is placed in an airtight sound insulation bin, drive end again by being arranged in soundproof box drives generator analog operation to be detected to operate, sound pressure sensor is adopted to gather generator operation voice signal, transfer signals to again earphone be converted into sound by operator's sense of hearing judge detect, and/or transfer signals to middle control computer carry out contrast judge detection.
Like this, generator NVH quality is judged according to the mode detecting sound in the present invention, then sound insulation bin is adopted to shield external sound interference, adopt soundproof box shield guard motor sound interference, this makes it possible to directly, record alternator for vehicle noise figure rapidly, make testing result very reliable, generator NVH quality degree can be reflected more exactly.Also objectively can judge whether noise figure reaches requirement of dispatching from the factory; It has test data true and accurate, precision is high; The structure of the detecting device form adopted is simple, adjustable flexibly, and test performance is good, the features such as cost is lower.
As the optimization of such scheme, in the pick-up unit adopted, the housing of described sound insulation bin and soundproof box, be hollow structure, it adopts cold-reduced sheet as surface of shell material, be provided with one deck perforated plate in housing hollow, be filled with melamine fat porous in the space between perforated plate and cold-reduced sheet cotton.Like this, three-decker forms resonant cavity sound absorption structure, can play great sound-adsorbing sound-insulating hung effect, avoids external sound and drive motor sound to the interference detected better.Ensure the accuracy of testing result.
As optimization, in the pick-up unit adopted, described belt tensioning mechanism, comprise belt tension motor and stretching pulley, stretching pulley is arranged in tension wheel shaft bearing, and tension wheel shaft bearing is slidably disposed on a level and is fixed on the guide rail below monitor station, and tension wheel shaft bearing is connected with the tooth bar that guide rail parallel is arranged with one, described belt tension motor output shaft is provided with gear, and pinion rotation also can be converted into tooth bar translation by gear and tooth bar engagement.
Like this, there is structure simple, the reliable advantage of tensioning.After convenient installation belt, then by this strainer by belt tension, ensure reliable transmission, detect accurately.
As optimization, in the pick-up unit of employing, described sound pressure sensor be two and one be transversely arranged at 300mm place, generator side to be detected, another is vertically arranged at engine head 300mm place to be detected.Like this, be provided with the sound pressure sensor of two different directions, conveniently mutually can compare to carry out mark when sound signal collecting, ensure the reliability detected better.
Alternator for vehicle NVH off-line test method of the present invention, specifically comprises the following steps:
A, acquisition are as the pick-up unit of said structure;
B, open soundproof door, generator to be detected is installed in the mount pad in sound insulation bin on monitor station, then between output wheel driving belt cover being set to belt pulley and generator to be detected, start belt tensioning mechanism and realize belt tension;
Soundproof door is closed after c, startup kinetic servo machine operation, servomotor is by transmission shaft and belt drive generator operation, generator operation voice signal is gathered by sound pressure sensor, transfer signals to again earphone be converted into sound by operator's sense of hearing judge detect, and/or transfer signals to middle control computer carry out contrast judge detection.
Like this, generator can be arranged in sound insulation environment by the present invention, when not by outside noise interference both can subjective assessment generator noise quality, whether can reach requirement of dispatching from the factory by the noise of the objective judgement generator of data analysis system again.Therefore the present invention to have apparatus structure simply compact, fabrication and installation are convenient, adjustable flexibly, and method test dynamic is good, the advantages such as test data true and accurate, precision are high, good reliability, and cost is lower.
Accompanying drawing explanation
Fig. 1 is the structural representation sketch of the pick-up unit that the present invention adopts when specifically implementing.
Fig. 2 be in Fig. 1 independent sound insulation bin open after structural representation.
Fig. 3 is the cut-open view of Fig. 2.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Figure 1-3, a kind of alternator for vehicle NVH off-line test device, comprises
Sound insulation bin 1, sound insulation bin is box typed structure and for the interference of isolated external voice, sound insulation bin 1 is provided with soundproof door 2;
Monitor station 3, described monitor station 3 is positioned at sound insulation bin 1, and monitor station 3 upper surface is provided with the mount pad 5 for installing generator 4 to be detected;
Drive end, described drive end comprises a soundproof box 6 be positioned at below monitor station, the water-cooled servomotor that a kinetic servo motor 7(preferably adopts low noise is provided with) in soundproof box 6, kinetic servo motor 7 output shaft and a transmission shaft are by shaft coupling 8(preferred rubber shaft coupling) level is connected, transmission shaft level is arranged on a bearing seat 9, and transmission shaft one end is extended soundproof box 6 rotationally and had belt pulley 10 at soundproof box 6 extenal fixation; The output wheel of belt pulley 10 and the generator to be detected after being installed on mount pad is oppositely arranged and leaves for installing driving belt in space between the two on monitor station 3;
Belt tensioning mechanism 11, the tensioning of described belt tensioning mechanism 11 between belt pulley 10 and the output wheel of the generator to be detected 4 after being installed on mount pad and for realizing driving belt;
Acoustics acquisition analysis system, described acoustics acquisition analysis system comprises the sound pressure sensor 12 be positioned at around sound insulation bin generator, sound pressure sensor is connected with data collecting card (not shown), and data collecting card is connected with the earphone (not shown) and/or control computer 13 being arranged in sound insulation bin outside by data line.
Wherein, the housing of described sound insulation bin 1 and soundproof box 6, is hollow structure, and it adopts cold-reduced sheet as surface of shell material, is provided with one deck perforated plate in housing hollow, has been filled with melamine fat porous cotton in the space between perforated plate and cold-reduced sheet.Like this, three-decker forms resonant cavity sound absorption structure, can play great sound-adsorbing sound-insulating hung effect, avoids external sound and drive motor sound to the interference detected better.
Wherein, described belt tensioning mechanism 11, comprise belt tension motor and stretching pulley, stretching pulley is arranged in tension wheel shaft bearing, tension wheel shaft bearing is slidably disposed on a level and is fixed on the guide rail below monitor station, and tension wheel shaft bearing is connected with the tooth bar that guide rail parallel is arranged with one, described belt tension motor output shaft is provided with gear, pinion rotation also can be converted into tooth bar translation by gear and tooth bar engagement.
Wherein, described sound pressure sensor 12 be two and one be transversely arranged at 300mm place, generator 4 side to be detected, another is vertically arranged at 300mm place, engine 4 top to be detected.
The present invention also discloses a kind of alternator for vehicle NVH off-line test method, specifically comprises the following steps:
A, acquisition are as the pick-up unit of said structure;
B, open soundproof door, generator to be detected is installed in the mount pad in sound insulation bin on monitor station, then between output wheel driving belt cover being set to belt pulley and generator to be detected, start belt tensioning mechanism and realize belt tension;
Soundproof door is closed after c, startup kinetic servo machine operation, servomotor is by transmission shaft and belt drive generator operation, generator operation voice signal is gathered by sound pressure sensor, transfer signals to again earphone be converted into sound by operator's sense of hearing judge detect, and/or transfer signals to middle control computer carry out contrast judge detection.
The present invention can be direct, records alternator for vehicle noise figure rapidly, can subjective assessment engine NVH quality, also objectively can judge whether engine NVH reaches requirement of dispatching from the factory; It has test data true and accurate, advantage that precision is high; It is simple that the pick-up unit wherein adopted has version, adjustable flexibly, and test performance is good, the advantages such as cost is lower.
Claims (6)
1. an alternator for vehicle NVH off-line test device, is characterized in that, comprise
Sound insulation bin, sound insulation bin is box typed structure and for the interference of isolated external voice, sound insulation bin is provided with soundproof door;
Monitor station, described monitor station is positioned at sound insulation bin, and monitor station upper surface is provided with the mount pad for installing generator to be detected;
Drive end, described drive end comprises a soundproof box be positioned at below monitor station, a kinetic servo motor (preferably adopting the water-cooled servomotor of low noise) is provided with in soundproof box, kinetic servo motor output shaft is connected by shaft coupling (preferred rubber shaft coupling) level with a transmission shaft, transmission shaft level is arranged on a bearing seat, and transmission shaft one end is extended soundproof box rotationally and had belt pulley at soundproof box extenal fixation; The output wheel of belt pulley and the generator to be detected after being installed on mount pad is oppositely arranged and leaves for installing driving belt in space between the two on monitor station;
Belt tensioning mechanism, the tensioning of described belt tensioning mechanism between belt pulley and the output wheel of the generator to be detected after being installed on mount pad and for realizing driving belt;
Acoustics acquisition analysis system, described acoustics acquisition analysis system comprises the sound pressure sensor be positioned at around sound insulation bin generator, sound pressure sensor is connected with data collecting card, and data collecting card is connected with the earphone and/or control computer being arranged in sound insulation bin outside by data line.
2. alternator for vehicle NVH off-line test device as claimed in claim 1, it is characterized in that, the housing of described sound insulation bin and soundproof box, be hollow structure, it adopts cold-reduced sheet as surface of shell material, be provided with one deck perforated plate in housing hollow, be filled with melamine fat porous in the space between perforated plate and cold-reduced sheet cotton;
Like this, three-decker forms resonant cavity sound absorption structure, can play great sound-adsorbing sound-insulating hung effect, avoids external sound and drive motor sound to the interference detected better.
3. alternator for vehicle NVH off-line test method as claimed in claim 1, it is characterized in that, described belt tensioning mechanism, comprise belt tension motor and stretching pulley, stretching pulley is arranged in tension wheel shaft bearing, tension wheel shaft bearing is slidably disposed on a level and is fixed on the guide rail below monitor station, and tension wheel shaft bearing is connected with the tooth bar that guide rail parallel is arranged with one, described belt tension motor output shaft is provided with gear, and pinion rotation also can be converted into tooth bar translation by gear and tooth bar engagement.
4. alternator for vehicle NVH off-line test method as claimed in claim 1, it is characterized in that, described sound pressure sensor be two and one be transversely arranged at 300mm place, generator side to be detected, another is vertically arranged at engine head 300mm place to be detected.
5. an alternator for vehicle NVH off-line test method, it is characterized in that, generator to be detected is placed in an airtight sound insulation bin, drive end again by being arranged in soundproof box drives generator analog operation to be detected to operate, sound pressure sensor is adopted to gather generator operation voice signal, transfer signals to again earphone be converted into sound by operator's sense of hearing judge detect, and/or transfer signals to middle control computer carry out contrast judge detection.
6. alternator for vehicle NVH off-line test method as claimed in claim 5, is characterized in that, specifically comprise the following steps:
The pick-up unit of a, acquisition structure any one of claim 1 to 4;
B, open soundproof door, generator to be detected is installed in the mount pad in sound insulation bin on monitor station, then between output wheel driving belt cover being set to belt pulley and generator to be detected, start belt tensioning mechanism and realize belt tension;
Soundproof door is closed after c, startup kinetic servo machine operation, servomotor is by transmission shaft and belt drive generator operation, generator operation voice signal is gathered by sound pressure sensor, transfer signals to again earphone be converted into sound by operator's sense of hearing judge detect, and/or transfer signals to middle control computer carry out contrast judge detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410576755.6A CN104266749B (en) | 2014-10-24 | 2014-10-24 | A kind of alternator for vehicle NVH off-line test devices and methods therefors |
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| CN201410576755.6A CN104266749B (en) | 2014-10-24 | 2014-10-24 | A kind of alternator for vehicle NVH off-line test devices and methods therefors |
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| CN104266749A true CN104266749A (en) | 2015-01-07 |
| CN104266749B CN104266749B (en) | 2017-08-11 |
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Cited By (13)
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| CN104792406A (en) * | 2015-04-05 | 2015-07-22 | 重庆理工清研凌创测控科技有限公司 | NVH offline detecting device for car gearbox |
| CN104849352A (en) * | 2015-05-05 | 2015-08-19 | 中国科学院信息工程研究所 | Sound-insulation performance detection system |
| CN105208487A (en) * | 2015-07-22 | 2015-12-30 | 广西汽车集团有限公司 | Sound collection system |
| CN105277370A (en) * | 2015-11-25 | 2016-01-27 | 山东大学 | Engine exhaust noise off-line simulation test table and test method |
| CN105277275A (en) * | 2015-11-10 | 2016-01-27 | 吉林大学 | Test stand for testing automobile tyre pavement noises |
| CN105841797A (en) * | 2016-03-15 | 2016-08-10 | 中南大学 | Window motor abnormal noise detection method and apparatus based on MFCC and SVM |
| CN106404163A (en) * | 2016-08-25 | 2017-02-15 | 辽宁科技学院 | Testing stand for testing gear engagement noise of gearbox |
| CN108051080A (en) * | 2018-02-02 | 2018-05-18 | 无锡市朗迪测控技术有限公司 | The online noise test platform of generator |
| CN109163909A (en) * | 2018-10-16 | 2019-01-08 | 汽-大众汽车有限公司 | A kind of automobile engine nacelle noise detection apparatus |
| CN111624000A (en) * | 2020-06-08 | 2020-09-04 | 安徽江淮汽车集团股份有限公司 | NVH detection equipment |
| CN113163316A (en) * | 2020-01-23 | 2021-07-23 | 上海擎动信息科技有限公司 | Sound vibration collecting equipment |
| CN113359029A (en) * | 2021-06-03 | 2021-09-07 | 大连交通大学 | Train motor fault acoustic detection equipment with high detection precision |
| CN113483884A (en) * | 2021-06-21 | 2021-10-08 | 深圳市优瑞特检测技术有限公司 | Vibration abnormal sound testing device for package detection and detection method thereof |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792406A (en) * | 2015-04-05 | 2015-07-22 | 重庆理工清研凌创测控科技有限公司 | NVH offline detecting device for car gearbox |
| CN104849352A (en) * | 2015-05-05 | 2015-08-19 | 中国科学院信息工程研究所 | Sound-insulation performance detection system |
| CN104849352B (en) * | 2015-05-05 | 2017-09-29 | 中国科学院信息工程研究所 | A kind of sound insulation property detecting system |
| CN105208487A (en) * | 2015-07-22 | 2015-12-30 | 广西汽车集团有限公司 | Sound collection system |
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| CN105841797B (en) * | 2016-03-15 | 2019-07-02 | 中南大学 | A kind of Car window electric machine extraordinary noise detection method and device based on MFCC and SVM |
| CN105841797A (en) * | 2016-03-15 | 2016-08-10 | 中南大学 | Window motor abnormal noise detection method and apparatus based on MFCC and SVM |
| CN106404163A (en) * | 2016-08-25 | 2017-02-15 | 辽宁科技学院 | Testing stand for testing gear engagement noise of gearbox |
| CN106404163B (en) * | 2016-08-25 | 2019-04-19 | 辽宁科技学院 | One kind is for testing gearbox gear meshing noise testing stand |
| CN108051080A (en) * | 2018-02-02 | 2018-05-18 | 无锡市朗迪测控技术有限公司 | The online noise test platform of generator |
| CN109163909A (en) * | 2018-10-16 | 2019-01-08 | 汽-大众汽车有限公司 | A kind of automobile engine nacelle noise detection apparatus |
| CN113163316A (en) * | 2020-01-23 | 2021-07-23 | 上海擎动信息科技有限公司 | Sound vibration collecting equipment |
| CN113163316B (en) * | 2020-01-23 | 2023-03-14 | 上海擎动信息科技有限公司 | Sound vibration collecting equipment |
| CN111624000A (en) * | 2020-06-08 | 2020-09-04 | 安徽江淮汽车集团股份有限公司 | NVH detection equipment |
| CN113359029A (en) * | 2021-06-03 | 2021-09-07 | 大连交通大学 | Train motor fault acoustic detection equipment with high detection precision |
| CN113359029B (en) * | 2021-06-03 | 2022-12-23 | 大连交通大学 | Train motor fault acoustic detection equipment with high detection precision |
| CN113483884A (en) * | 2021-06-21 | 2021-10-08 | 深圳市优瑞特检测技术有限公司 | Vibration abnormal sound testing device for package detection and detection method thereof |
| CN113483884B (en) * | 2021-06-21 | 2023-09-26 | 深圳市优瑞特检测技术有限公司 | Vibration abnormal sound testing device for package detection and detection method thereof |
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