Modal Parameter Identification of Stay Cables Based on Vibration Measurements with the Application of Wavelet Transform Techniques

• Main Authors: Yi-Yan Peng, 彭一晏
• Other Authors: Wen-Hwa Wu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/uq853u

碩士 === 國立雲林科技大學 === 營建工程系碩士班 === 96 === The ambient vibration signal of a stay cable is commonly adopted to estimate its cable force for a long-term health monitoring. The significant change in cable force induced by passing heavy vehicles in a short period, on the other hand, is an important factor to cause fatigues and also requires a reliable method for effective evaluation. However, the conventional Fourier analysis is developed to transform the signal from the time domain into the frequency domain and consequently would fail the need to trace the corresponding time-varying information for such a non-stationary signal. It is aimed in this research to apply the wavelet transform technique covering both the time and frequency domains for investigating the time-varying modal parameters of a stay cable. The primary results of this research are presented in this paper by developing the fundamental methodology and conducting the parameter study. Simulated numerical examples and measured vibration signals from Chi-Lu Bridge are also used to verify the effectiveness of the proposed method.