| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系 === 94 === This work aims to perform the dynamic analysis and vibration response prediction of the printed circuit boards (PCB) for environmental vibration testing. This work first, adopts finite element analysis (FEA) and experimental modal analysis (EMA) to perform model verification for the PCB. Both FEA and EMA are performed, respectively, to determine the modal properties of the PCB. Theoretical natural frequencies, mode shapes and frequency response function (FRF) can be computed by FEA. Experimental natural frequencies, damping ratios, mode shapes and frequency response functions of the PCB can also be obtained by EMA. Via the optimization procedure to verify modal properties obtained from FEA with those from EMA, the equivalent finite element model for the PCB can be validated. Then the fixture is affirmed as good ability to transmit signal by random vibration experiment. Finally, the theoretical model is used to execute harmonic response analysis and spectrum response analysis. The vibration response prediction and maximum damage area of PCB can be obtained and evaluated. The results of this study can not only provide the useful information for sub-component of PCB damage analysis in random vibration testing but also assist to build the standard analysis procedures regarding the vibration testing of PCB.
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