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Proceedings Paper

Time frequency analyses of vibrations of wind turbine towers
Author(s): Chih-Hung Chiang; Chi-Luen Huang; Keng-Tseng Hsu; Chia-Chi Cheng; Chih-Peng Yu; Jiunnren Lai
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Paper Abstract

Transient vibrations of the tower supporting a horizontal-axis wind turbine were recorded using a microwave interferometer. Variations in dominant frequencies have been reported in the previous study. Signal analyses aiming to uncouple different frequency components were performed using reassigned spectrogram, a time-frequency representation based on time-corrected short time Fourier transform. Optimal resolutions in both time and frequency domains were first investigated using synthetic signals. The goal was to seek out the favorable combinations of window size and overlapping portions of adjacent windows for a data sequence at a given sampling rate. The dominant frequency found in reassigned spectrogram agrees with that obtained using Fourier spectrum of the same transient measurements of the wind turbine tower under investigation.

Paper Details

Date Published: 1 April 2015
PDF: 14 pages
Proc. SPIE 9437, Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure 2015, 94371C (1 April 2015); doi: 10.1117/12.2084154
Show Author Affiliations
Chih-Hung Chiang, Chaoyang Univ. of Technology (Taiwan)
Chi-Luen Huang, Chaoyang Univ of Technology (Taiwan)
Keng-Tseng Hsu, Chaoyang Univ. of Technology (Taiwan)
Chia-Chi Cheng, Chaoyang Univ. of Technology (Taiwan)
Chih-Peng Yu, National Chung Hsin Univ. (Taiwan)
Jiunnren Lai, Chaoyang Univ. of Technology (Taiwan)


Published in SPIE Proceedings Vol. 9437:
Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure 2015
Peter J. Shull, Editor(s)

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