Dynamic characterization of a damaged beam using empirical mode decomposition and Hilbert spectrum method

Chih-Chen Chang; Chun-Wing Poon

doi:10.1117/12.540230

21 July 2004 Dynamic characterization of a damaged beam using empirical mode decomposition and Hilbert spectrum method

Chih-Chen Chang, Chun-Wing Poon

Proceedings Volume 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III; (2004) https://doi.org/10.1117/12.540230
Event: NDE for Health Monitoring and Diagnostics, 2004, San Diego, CA, United States

Abstract

Recently, the empirical mode decomposition (EMD) in combination with the Hilbert spectrum method has been proposed to identify the dynamic characteristics of linear structures. In this study, this EMD and Hilbert spectrum method is used to analyze the dynamic characteristics of a damaged reinforced concrete (RC) beam in the laboratory. The RC beam is 4m long with a cross section of 200^mm X 250^mm. The beam is sequentially subjected to a concentrated load of different magnitudes at the mid-span to produce different degrees of damage. An impact load is applied around the mid-span to excite the beam. Responses of the beam are recorded by four accelerometers. Results indicate that the EMD and Hilbert spectrum method can reveal the variation of the dynamic characteristics in the time domain. These results are also compared with those obtained using the Fourier analysis. In general, it is found that the two sets of results correlate quite well in terms of mode counts and frequency values. Some differences, however, can be seen in the damping values, which perhaps can be attributed to the linear assumption of the Fourier transform.

Citation Download Citation

Chih-Chen Chang and Chun-Wing Poon "Dynamic characterization of a damaged beam using empirical mode decomposition and Hilbert spectrum method", Proc. SPIE 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III, (21 July 2004); https://doi.org/10.1117/12.540230

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