The Research on Cable Broken Wires Inspection for a Cable Stayed Bridge by Discrete Wavelet Transformation

An inspection method and circuit by magnetic leakage field is offered for cables, due for which the test of a serving cable stayed bridge must be only lossless. In order to reduce noise of space magnetic field during the work environment that of result in an unclear signal character, a discrete soft threshold algorithm on the Gaussian white noise is applied to separate signal and noise for circumference magnetic field of a checked cable by the dyadic wavelet transform for the sake of the fault size. In order to obtain the precise fault location, a singularity analysis is applied for oriental magnetic field of the cable by the singular point of signal waveform and Lipschitz exponent. The experiment results have showed that it will be obtained the information of fault degree and location to the checked cable by the new approach, so that the credible proof will be given about detection and analysis to the broken wires for the cable stayed bridge.