Detection of contact-type failure based on nonlinear wave modulation using local standing wave generated between excitation points

Abstract

This paper concerns detection of contact-type failure based on nonlinear wave modulation using local standing wave generated between excitation points. The contact failure detection method based on nonlinear wave modulation improves the detection accuracy by using ultrasonic vibration of natural vibration. However, the ultrasonic vibration of natural vibration cannot be excited in a large structure. Therefore, we focused on the fact that a local standing wave is formed between the excitation points. In this paper, we perform a basic study on contact failure detection based on nonlinear wave modulation using locally standing waves. A local standing wave is formed by exciting a beam structure in which ultrasonic vibration of natural vibration is difficult to excite at two points. We indicate that it is possible to detect contact failure based on nonlinear wave modulation by using the formed local standing wave.