Quan hệ giữa các moment của phổ công suất với kích thước vết nứt của dầm

Abstract

The paper shows the results of experimental studies with the relationship of moment’s power spectral density that was built random vibration signal of the beam under moving load and the size’s crack. In these results, the author will propose adding two parameters that used to monitoring the lifespan of beam. It is the Zero-Order Spectral Moment, the First-Order Spectral Moment and the Second-Order Spectral Moment. It can be seen that these parameter can easily identify and have higher sensitivity more than deflection, natural frequencies, mode shapes.