سال انتشار: ۱۳۸۶

محل انتشار: دومین کنفرانس بین المللی و هشتمین کنفرانس ملی مهندسی ساخت و تولید

تعداد صفحات: ۹

نویسنده(ها):

M.H Soorgee – Graduate Student Advanced Dynamics and Control Systems Lab, Faculty of Mechanical Engineering,University College of Engineering, Campus #2, University of Tehran, Tehran, Iran
A Yousefi-Koma – Assistant Professor

چکیده:

This paper is a numerical simulation and verification of health monitoring of beam structures using propagating piezo-actuated lamb waves. The goal of this research is to detect the location of a linear crack in a beam using a piezoelectric actuator/impact hammer and a piezoelectric sensor based on the time-of-flight of propagating waves. The actuation signal is first determined based on the propagating lamb wave modes in a thin structure and group dispersion curve of an aluminum plate. The commercial finite element code (ABAQUS) has been employed to model a beam with an actuator-sensor pair and a tiny groove representing the crack. After a transient dynamic analysis, the sensor response has been acquired. Using Hilbert Huang Transform (HHT) method, from the timeenergy spectrum of sensor response and propagating wave time-of-flight, location of the crack has been detected