Time frequency analyses of vibrations of wind turbine towers

Chih-Hung Chiang; Chi-Luen Huang; Keng-Tseng Hsu; Chia-Chi Cheng; Chih-Peng Yu; Jiunnren Lai

doi:10.1117/12.2084154

1 April 2015 Time frequency analyses of vibrations of wind turbine towers

Chih-Hung Chiang, Chi-Luen Huang, Keng-Tseng Hsu, Chia-Chi Cheng, Chih-Peng Yu, Jiunnren Lai

Proceedings Volume 9437, Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure 2015; 94371C (2015) https://doi.org/10.1117/12.2084154
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

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.

Citation Download Citation

Chih-Hung Chiang, Chi-Luen Huang, Keng-Tseng Hsu, Chia-Chi Cheng, Chih-Peng Yu, and Jiunnren Lai "Time frequency analyses of vibrations of wind turbine towers", Proc. SPIE 9437, Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure 2015, 94371C (1 April 2015); https://doi.org/10.1117/12.2084154

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