The Design Of Portable Vibration Signal Measurement System And Vibration Signal Analysis

In order to provide a reference for the structural optimization of piezoelectric energy harvester, it needs to obtain the actual vibration excitation applied to the energy transforming elements. Thus a portable vibration signal measurement and analysis system is designed to test and analyze the vibration's acceleration signal of Nanjing Yangtze River Bridge. Furthermore, on the basis of the obtained vibration signal, analysis of output power of the energy harvester and the energy transforming efficiency are given.The portable vibration signal measurement and analysis system is composed of two parts: the signal testing terminal and the vibration signal analyzing software. First of all, the signal testing terminal transforms the vibration acceleration signal into the corresponded voltage signal with the ICP piezoelectric acceleration sensor. Then the voltage signal is delivered into the computer either with the wireless module or with the USB port connected to the DAQ. Mixed programming with Labview and Matlab, the signal analyzing flat is established to give the frequency analysis, the wavelet transform and the frequency integral of the signal.Moreover, with the piezoelectric equations, the output power could be obtained and the energy converting efficiency of the piezoelectric energy harvester is carried out. In the end, the influence of parameters of the piezoelectric energy transforming elements on the energy converting efficiency is put forward, which provides a reference for the further optimization.