DAMAGE IDENTIFICATION FROM UNIFORM LOAD SURFACE USING CONTINUOUS AND STATIONARY WAVELET TRANSFORMS

Authors

  • MASOUD MASOUMI RESEARCH ASSISTANT AT MODAL ANALYSIS LABORATORY, SCHOOL OF MECHANICAL ENGINEERING, SEMNAN UNIVERSITY

Keywords:

MODAL ANALYSIS, DAMAGE DETECTION, WAVELET ANALYSIS, FLEXIBILITY MATRIX, UNIFORM LOAD SURFACE

Abstract

HAVING BEEN DERIVED FROM FLEXIBILITY MATRIX, UNIFORM LOAD SURFACE (ULS) IS USED TO IDENTIFY DAMAGES IN BEAM-TYPE STRUCTURES. THIS METHOD IS BENEFICIAL IN TERMS OF PARTICIPATING LOWER MODE SHAPES AND HAVING LESS PRONE TO NOISY DATA IN COMPARISON WITH FLEXIBILITY MATRIX TECHNIQUE. HENCE THESE CHARACTERISTICS MAKE IT A PRACTICAL TOOL IN THE FIELD OF DAMAGE IDENTIFICATION. THIS PAPER PRESENTS A PROCEDURE TO EMPLOY STATIONARY WAVELET TRANSFORM MULTI-RESOLUTION ANALYSIS (SWT-MRA) TO REFINE ULS OBTAINED FROM DAMAGED STRUCTURE AND THEN CONTINUOUS WAVELET TRANSFORM (CWT) IS USED TO LOCALIZE IRREGULARITY OF IMPROVED ULS AS A SIGN OF DAMAGE SITE. EVALUATION OF THE PROPOSED METHOD IS CARRIED OUT BY EXAMINING A CANTILEVER BEAM AS A NUMERICAL CASE, WHERE THE ULS IS FORMED USING MODE SHAPES OF DAMAGED BEAM AND TWO KINDS OF WAVELETS (I.E. SYMMETRICAL 4 AND BIOR 6.8) IS APPLIED TO DISCERN THE INDUCED CRACK. MOREOVER, A STUDY ON A FREE-FREE BEAM IS CONDUCTED TO EXPERIMENTALLY EVALUATE THE PRACTICABILITY OF THE TECHNIQUE.

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Published

2013-12-27

Issue

Vol. 11 No. 5 (2014)

Section

Articles

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