Design Of The Measurement And Analysis Instrument For Real-time Road/Tread Pattern Noise

The automobile driving noise is one of the major sources of traffic noise. Experiments show that, the tire noise is one of the primary factors constitutes the automobile driving noise. When cars are at speeds above 70km/h, tread pattern noise becomes the dominant source of driving noise. As the only part that the tire contacts with ground, Its radiation of noise and vibration characteristic immediate influence taking comfortableness and stationarity of the car. Therefore every large domestic and international motor corporation launched the research of the tread pattern noise one after another and putted forward harsher requirement for the noise of the related tire. Therefore, promote the research of tread pattern noise, find out about the production mechanism of the tread pattern noise and develops the low-noise tire is imperative.This topic solves the problem according to the Hangzhou ZhongCe rubber company's project request.This thesis systematically studies road/tread pattern noise control from the following several aspects: the path/ tread pattern noise's composition and the sound production mechanism, the path/ tread pattern noise's influencing factor analysis, the indoor and the outdoor two test method and the corresponding test specification, the low-noise tire's subjective and objective evaluation criteria and so on.On the basis of researching and analyzing the preceding theories of chapters developed the Instrument for real-time road/tread pattern noise measurement and analysis, which uses Microsoft visualization development instrument Visual C++ 6.0 to development. The system has real-time measurement, analysis and display capabilities. It can not merely measure and analyze the road / tread pattern noise in real time, reveal the curve of audio frequency and spectral curve in real time, but also can measure the sound pressure level, the sound power level, perform the time field analysis, the frequency field analysis, the noise orientation analysis, the synthesis frequency spectrum analysis and comprehensive evaluation of the low-noise tread. In addition, the system has compensates the frequency response of the microphone function, acoustic level adjusts function and Non-tire noise filtration. It can be seen that this kind of multi-functional instrument is applicable to analysis, evaluation, taxis and excellence-selection of the tread pattern scheme.This article finally introduced and makes the revision and the consummation to the system of the Instrument for real-time road/tread pattern noise measurement and analysis, and has carried on the example analysis.The research fruit and software in this thesis which is advanced is strongly applicable to practical engineer, providing high effective approach for lower noise tire evaluation and tire noise measurement. Using VC developing flat to accomplish the software design, which has friendly interface. The foreign introduction's software is too expensive, this domestic software has very high ratio of performance-to-price.