The Development Of Test & Analysis System Of Vibration Noise Based On LabVIEW

Along with the development of the computer science and software technology, virtual instrument is becoming the focus of the research in modern test and control technology. It is the trend for the technology of test and control instruments. To meet the needs of the modernization, to increase the testing precision, a vibration noise signal testing and analysis system based on the LabVIEW software platform which can be widely used is developed in this paper. The system is consist of three parts: the signal acquiring and adjusting module, time-frequency analysis module and data storage and manage module. The time-frequency analysis module is the emphasis, which can achieve the following functions: wavelets de-noising to the signals, the extracting to the time-frequency signal Eigen values, spectrum analysis, cepstrum analysis and time-frequency analysis. All of these will be illustrated in detail by using the practical application system form—the vibration noise testing analysis system of rolling wheelchair.The simulated wheelchair working on the HT-9340 wheelchair dynamic durability tester is taken as the research object in practical testing analysis of this paper. By using pasted strain gages and electret microphone to acquire the vibration noise signal of the moving wheel-chair separately, combining the technology of digital signal processing and wavelet analysis as an expansion to the initial built vibration & noise testing and analyzing system, a specific application object oriented vibration noise testing analysis system is built. It not only has a signal acquisition and storage function to the original system in this experiment platform, but also has a function that can monitor the working status of the wheel-chair and control the work of the experiment platform. And this can make unmanned durability test monitor possible. Moreover, the practical testing system of the status monitoring of the simulated working wheel-chair is taken as an example in this paper to discuss the time-frequency analysis theory of the vibration noise and introduce the import of virtual instrument LabVIEW and its interrelated software and the using of the sub-VI functions in time-frequency analysis.The measurement and time-frequency analysis to the vibration & noise signal can be implemented by the testing and analyzing system in this paper, and the function of the system can be expanded easily .