A new wavelet-based method for determination of mode shapes: Experimental Results
Publish place: 6th National Congress on Civil Engineering
Publish Year: 1390
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
NCCE06_1190
تاریخ نمایه سازی: 28 مرداد 1390
Abstract:
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
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Authors
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
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