汪之松, 郭惠勇, 李正良. 基于频率响应的不同结构损伤识别方法研究[J]. 工程力学, 2008, 25(6): 6-013.
引用本文: 汪之松, 郭惠勇, 李正良. 基于频率响应的不同结构损伤识别方法研究[J]. 工程力学, 2008, 25(6): 6-013.
WANG Zhi-song, GUO Hui-yong, LI Zheng-liang. IDENTIFICATION METHODS FOR DIFFERENT STRUCTURAL DAMAGE BASED ON FREQUENCY RESPONSE[J]. Engineering Mechanics, 2008, 25(6): 6-013.
Citation: WANG Zhi-song, GUO Hui-yong, LI Zheng-liang. IDENTIFICATION METHODS FOR DIFFERENT STRUCTURAL DAMAGE BASED ON FREQUENCY RESPONSE[J]. Engineering Mechanics, 2008, 25(6): 6-013.

基于频率响应的不同结构损伤识别方法研究

IDENTIFICATION METHODS FOR DIFFERENT STRUCTURAL DAMAGE BASED ON FREQUENCY RESPONSE

  • 摘要: 为了解决结构损伤中的刚度和质量识别问题,将测量的响应位移应用于结构的损伤识别中,并提出了多频率激励损伤识别方法和改进的单频率激励损伤识别方法。对于多频率激励情况,首先分析了结构损伤的基本理论,然后推导了其刚度损伤指标和质量损伤指标的识别公式;对于单频率激励情况,则首先根据结构的刚度特性和质量特性确定结构损伤的简化定位方法,在此基础上提出了其相应的迭代改进策略,以提高识别的精度。数值仿真结果表明:对于刚度影响占主导地位的桁架结构,多频率激励法对于刚度损伤的识别效果较好,对于质量损伤的识别效果较差;而采用改进的单频率激励识别策略,则可以更好的识别出刚度和质量的损伤,其识别结果优于多频率识别法和简化单频率识别法。

     

    Abstract: In order to solve the stiffness and mass identification problems of structural damage, two damage detection approaches based on measured responses are presented, i.e. the Multiple Frequency Excitation Identification (MFEI) method and the improved Single Frequency Excitation Identification (SFEI) method. In the MFEI method, the basic theory of structural damage is first introduced, and then the formulas to calculate stiffness damage index and the mass damage index are proposed, which is based on the measured response of multiple frequency excitations. In the improved SFEI method, the simplified localization method of structural damage is first presented according to the stiffness and mass characteristics, and then an improved iterative strategy is proposed to conduct the calculation. The simulation results demonstrate that: For trusses the MFEI method can identify the stiffness damage but hardly to identify the mass damage. However, the improved SFEI method can identify both the stiffness damage and the mass damage, and the accuracy of the improved SFEI method are higher than that of the MFEI method and the simplified SFEI method.

     

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