利用平均振动响应能量的螺栓松动检测方法

Detecting Method for Bolt Looseness with Average Vibration Response Energy

为简单有效检测结构的螺栓松动故障,提出了一种利用平均振动响应能量的螺栓松动检测方法。首先,建立振动响应能量相关的螺栓松动损伤指标;然后,为减少噪声对数据结果的影响,提出将平均振动响应能量作为螺栓松动损伤指标;最后,利用螺栓松动前后该指标相对变化量构造损伤指数,并根据损伤指数大小判断松动螺栓所在位置。实验结果表明,该方法能有效的进行螺栓松动位置检测。

In order to detect the failure of bolt looseness of the structure simply and effectively,a method for detecting bolt looseness by using average vibration response energy was proposed.Firstly,the bolt loosening damage indicator related to vibration response energy was established.Secondly,in order to reduce the influence of the noise on the results,the average vibration response energy was proposed as the bolt loosening damage indicator.Finally,the relative change in the damage norm before and after bolt loosening was used to construct damage index,and the location of the loose bolt was judged according to the damage index.The experimental results show that the present method can effectively detect the bolt loosening position.