Application Study Of Wavelet Transform In Construct Detection And Analysis Of Cable-Stayed Bridge

Dynamical detection method is more and more used in detection and analysis of cable-stayed bridge. So it is inevitably involved in gathering and analysis of vibration signal.Vibration signal of cable-stayed 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 have 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 cable-stayed bridge and process in time field and frequency field. So it is adapt to vibration detection of cable-stayed bridge.The article firstly selects right wavelet group, and decomposes and reconstructs signal by wavelet analysis to delete noise, and distinguishes the development trend of useful signal from detection signal involved in noise of cable-stayed bridge. Based by singularity of vibration signal of damage position on cable-stayed bridge as vibrating, we can analyze vibration signal when cable-stayed bridge is damaged to estimate structure damage. This article illuminates the potential of wavelet application to dynamical detection of cable-stayed bridge.