A Vibration Signal Acquisition And Analysis System Based On MATLAB

The main purpose of this paper is to design a real-time vibration signal acquisition and analysis system. The innovations are that designing real-time data acquisition program and designing real-time signal processing program, while designing parameter identification program under unknown input load. The main contents are as following.Firstly, the data acquisition module is develpoed. The main hardwares are PCI-1712 data acquisition card and piezoelectricity sensor. The first step is to build the link between hardware and software platform. The second step is to design real-time data acquisition program based on the program rule of Data Acquisition Toolbox and the FIFO buffer of PCI-1712 data acquisition card. With removing the used data from the buffer at intervals (Be sure the data has been saved) and then gather new data, the data's real-time performance can be obtained.Secondly, the signal processing module is developed with Signal Processing Toolbox. The contents include four parts as following. The pretreatment of signal, the signal processing in time domain mainly about filter, the signal processing in frequency domain mainly about spectrum function and the parameter identification module. All the present of the above functions are based on the powerful numeration performance and perfect functions of MATLAB.Thirdly, with the powerful matrix numeration function, the model of structure and the movie play of Normal Modal are obtained.Finally, friendly mutual system is developed with GUI of MATLAB.