索结构损伤的行波识别法

Cable damage detection method based on traveling wave analysis

为准确评价工作状态下索的健康状况,分析了索受扰动后的行波响应,提出了行波损伤识别法。该方法通过测量索上一点的响应,确定索损伤段行波相速度的变化以及行波在损伤界面处的反射、透射系数,并据此得到索的损伤位置、损伤程度和损伤段长度。给出了以行波法识别索结构损伤的仿真算例,并与模态参数法进行了对比分析。结果表明,行波法识别结果与实际情况一致,适合于索结构损伤识别。

A damage detection method was developed to accurately evaluate cable status for working conditions based on the analysis of the traveling wave respond in a cable. In this method, the phase velocity change in the damaged section and the reflection and transmission coefficients of the traveling wave at the damage interface are used to locate the location, magnitude, and length of damage by measuring the respond at a certain spot in the cable. An example is given to illustrate use of the traveling wave method for damage detection relative to the traditional modal and structural methods, and demonstrates that the result of the traveling wave method is consistent with the real situation so the method is suitable for damage detection in cables.