OS0705 二次元に模擬した打撃試験における試験片とスリットの寸法の変化による振動特性への影響

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  • OS0705 Effect of specimen size and slit size on dynamic response in the case of two-dimensional impact testing model

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Detecting crack by using the cross correlation function of the measured vibration responses was carried out. A fast and easy check of machine parts is necessary for mass-production. The method of a fast and easy check of machine parts need (1) simple hold method for clamping the test piece and (2) fast signal processing. In this study, we pay attention to (2) fast signal processing. Real crack in the machine parts was treated as two-dimensional crack model. Test piece size and crack size were varied. Natural frequency of first bending mode was obtained by period derived from result of the cross correlation function. And also, natural frequency of first bending mode was obtained by the result of Fast Fourier Transform (FFT). Natural frequency was changed by test piece size and crack size. Distribution of the natural frequency can be confirmed clearly by the result derived from the cross correlation function.

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