Automobile Transmission-line Performance Monitoring And Noise And Vibration Control Applications Research

Along with equipment's development towards high-speed, high-power, high stabilization and large-scale and improvement of material culture living standard, vehicles, more and more machine equipment, household electric appliances are put into use. Meanwhile the noise of problem is getting more serious. Noise pollution has becomes a world-wide problem nowadays.There are many ways to diagnose fault of gear, but vibration and noise diagnosis are generally considered most promising method. Vibration is the attribute of gear transmission, and when fault occurs to gear, the size and shape of vibration and noise of gear will vary. So the signal of vibration and noise of gear include of lots of information. Using a variety of measurement instruments of vibration and noise, we can easily gather and analyze the signal, and extract the feature of fault information. Without stopping and disassembling, the running state and the reason, position, and damaged disagree of fault can be discovered clearly. Accordingly, the quality of gearbox is promoted; the performance of automobile is improved; running orderly and condition based maintenance of equipments are given plenty of cause, so remarkable economic benefits are gained in producing and equipment maintenance. At the same time, the competitive ability for the national automobile products is enhanced; technique support is supplied for national automobile entering international market.Firstly, the basic concept and measurement method of vibration-noise are presented hi this paper. Mechanism and control method of the noise about automobile gearbox are analyzed. Several signal processing methods in vibration-noise diagnosis are discussed. And the method of evaluating sound level by vibrating signal is renovated and put into use in the "Automobile Gearbox's Performance Testing System". Then, taking X gearbox made in Gearbox factory of China 1st automobile work as background, the author developed 'Automobile Gearbox Performance Testing System' which is a integrated examining system including examining, on-line monitoring, signal analyzing and diagnosis. In the system, vibration-noise diagnosis methods and the related signal processing methods are used. In this paper, testing system scheme designing of software system is elaborated. And the scheme of resolving the simultaneity event is discussed in detail. At last, application of the system in automobile gearbox product line is introduced.