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The Development of Vibration Signal Analysis System for Transmission Based on LabVIEW

Author: PengZeYuan
Tutor: LiWeiHua；JingTianLong
School: South China University of Technology
Course: Vehicle Engineering
Keywords: Transmission Test Analysis System Development LabVIEW
CLC: U463.212
Type: Master's thesis
Year: 2011
Downloads: 153
Quote: 0
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Abstract


Transmission is an important component of automobile and its quality affects the performance of automobile directly. With the progress of automotive technology and the improvement of life quality, the demand for NVH quality of automobile becomes higher and higher. As the power train of automobile, we do value the quality of transmission more and more. Therefore, developing a vibration signal analysis system to realize the test and fault analysis for transmission is useful for guaranteeing the quality of transmission and improving the NVH quality of automobile, which is meaningful for engineering applications.With the discuss of common faults of transmission and their vibration mechanism, the methods of test and analysis for transmission are studied and selected, which are effective when the revolving speed of transmission is either stable or varying. Among them, when revolving speed varies slowly, the methods of frequency spectrum analysis, zoom analysis, demodulation analysis and cepstrum analysis are adopt; and under the conditions of speed-up or speed-down, the methods of time-frequency analysis and order analysis are used. As revolving speed is an important parameter for transmission test, this paper studies three ways to get revolving speed. By means of simulation analysis, these three methods are compared and their advantages and disadvantages are pointed out. Three kinds of order tracking analysis methods as the key points are studied in-depth. Because computed order tracking analysis can analyze all the order compositions in order domain at the same time, so it is quite appropriate for transmission test. The methods of order tracking analysis based Gabor transform time-frequency analysis and order tracking analysis based Vold-Kalman filtering are adopt to extract the wanted order compositions in time domain. Then, combine energy centrobaric correction method and computed order tracking analysis method to realize order traking analysis without revolving speed. Finally, develop the vibration signal analysis system for transmission, including the selection of hardware and the design of software system as a key part. The software system is programmed by LabVIEW of American NI company and it has two modes, online analysis and offline analysis. Use fault simulating equipment named QPZZ-II to simulate the decentration of gear, the fault of bearing inner race and the unbalance of axle separately, which are typical faults of transmission, and apply the developed analysis system to test and analyze them. It’s successful to extract the features of these faults and it shows that this analysis system has effectiveness and availability.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Transmission > Mechanical transmission > Transmission
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