Abstract：The model parameters and stiffness of guyed mast are sensitive to the initial pre-tension, excitation and environment, this leads many efficient methods and index difficult to be applied. A damage identification method that takes advantage of the time-frequency analysis of structure response and does not rely on modal information is explored, the relative alteration of Wigner-Ville Distribution Cross-term Statistic （WCS）based on vibratory response is developed for damage identification of guyed mast. Analysis results of a numerical example demonstrate that, not only can the relative alteration of WCS at sensors distinguish single different degree damage and multi damages of the shaft, but also it can identify guy’s damage. The susceptivity of the index to damage can be enhanced by increasing excitation and the number of sensors. The damage identification of the index computed by displacement response is better than that computed by acceleration response.
2010, Vol. 29 
