【摘要】 小波理论是近年来迅速发展起来的新兴学科,已成为众多领域的研究热点。选用恰当的小波基函数,通过小波分析对信号进行分解和重构消除噪声,并识别在检测含噪信号中有用信号的发展趋势。桥梁结构在振动时受损部位的振动信号的奇异性,利用小波奇异性检测理论分析桥梁结构在受损时的振动信号,判断结构损伤情况。更多还原

【Abstract】 Wavelets is a developing subject. It provides a new toll employing digital signal processing in engineering. Vibration signal of bridge often have non-stationary and timely character. Traditional Fourier transform is a kind of whole transformation and short-time Fourier transform have the limitation that if short-time window is ascertained, its shape is also certain. But wavelet analysis method has higher and lower time solution at low frequency, have lower frequency solution and higher time solution. By its multi-solution idea, we can focalize discretionary detail of detection of bridge and process in time field and frequency field. So it is adapt to vibration detection of bridge.更多还原