一种基于频率响应曲率的损伤检测多步判定方法

在频率响应曲率指标基础上,提出了一种多步的检测方法,使用少量的传感器进行多步判定,来提高损伤定位的准确性和可靠性。通过简支梁的有限元数值算例,详细比较了改进的模态曲率方法、改进的柔度曲率方法和该文提出的方法对梁状多损伤结构的识别效果和抗噪能力。最后采用试验建模的技术,对局部减薄的多损伤管道和局部裂纹的单损伤管道进行损伤识别试验,结果验证了该方法的优越性,对解决实际工程结构的损伤检测问题具有一定的意义。

A MULTI-STEP DECISION METHOD FOR DAMAGE DETECTION BASED ON FREQUENCY RESPONSE CURVATURE

a multi-step decision method for structural damage detection based on frequency response curvature using a few sensors is presented to improve detection accuracy and reliability.Numerical example of multi-damaged simply-supported beam is used to illustrate the validity of the presented method.The efficiencies and antinoise abilities of three improved methods(improved modal curvature method,improved flexibility curvature method and the proposed method) are analyzed and compared in detail.Finally experimental examples of a multi-damaged pipeline with local reduction and a single-damaged pipeline with local crack based on experimental model are preformed to verify the correctness and feasibility of the proposed method.The results show that the proposed method worked well for the damage detection and the assessments are in good agreement with the actual condition,which is meaningful in the application to damage detection in engineering structure.