【摘要】 因索中某几股断裂而导致索等效截面减小是索结构常见的损伤模式。文中分析此损伤模式下索受扰动后的行波响应 ,提出重力场中索结构损伤的行波识别法。该方法由索上一点的实测响应数据 ,根据入射波和反射波到达该点的时间确定损伤位置 ,根据入射波和反射波的信号能量比及能量的时域分布确定损伤程度和损伤段宽度。为适应现场有噪声测试数据的影响 ,应用多分辨率分析理论 ,以Daubechies小波分解行波响应信号 ,对信号去噪并作出白噪声情况下损伤识别方法的误差估计。仿真结果表明 ,该方法可采用噪声污染响应信号对重力场中索结构的损伤进行准确的估计 ,适合小损伤情况下索结构的损伤识别。更多还原

【Abstract】 The damage of cable structure is often caused by break of several strands. A cable damage detection method is introduced by analyzing the traveling wave respond of a given point on a damage cable. The influence of gravitational field is also considered in this method. The location of damage is ascertained by the arriving time of incident and reflected wave, the magnitude and length of damage by the energy ratio and time domain energy distribution of incident and reflected wave. In order to deal with a respond signal contaminated by noise, the Daubechies wavelet is used to denoise this signal and give error estimate in the case of white noise. A simulation result demonstrates that this method can estimate the damage of cable structure in gravitational field using noise contaminated respond signal and it adapts to minute damage instance.更多还原