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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。
Based on the frequency response curvature index, a multi-step detection method is proposed, which uses fewer sensors to make multi-step determination to improve the accuracy and reliability of damage localization. Through the finite element numerical examples of simply supported beams, the improved modal curvature method, the improved compliance curvature method and the proposed method are compared in detail to identify the effect and anti-noise ability of beam-like multi-damage structures. Finally, using the experimental modeling technique, the damage identification test of locally thinned multi-damage pipes and local damage single damage pipes is carried out. The results verify the superiority of this method and have certain significance for solving the damage detection of practical engineering structures .