سال انتشار: ۱۳۹۰

محل انتشار: ششمین کنگره ملی مهندسی عمران

تعداد صفحات: ۸

نویسنده(ها):

M. R. Ashory – Assistant professor, School of Mechanical Engineering, Semnan University
M. Jaafari – MSc of Mechanical Engineering, School of Mechanical Engineering, Semnan University
M. M. Khatibi – MSc of Mechanical Engineering, Islamic Azad University-Semnan Branch
A. Malekjafarian – MSc of Mechanical Engineering, School of Mechanical Engineering, Semnan University

چکیده:

In this article a new method is proposed to determine the mode shapes of linear dynamic systems from the results of wavelet analysis. A previously proposed method based on a modified Morlet wavelet function with an adjusting parameter is used to identify the natural frequencies and damping ratios of system. The mode shapes are obtained from the time signal of responses and the extracted natural frequencies from wavelet transform of response signals. The method is applied to a steel real beam excited by an impact force. It is shown that the extracted mode shapes are not scaled. Therefore, the mass change method is used for scaling of the mode shapes