曹永红, 张新亮, 曹 晖, 李英民. 基于实用完备模态空间的两阶段损伤识别方案[J]. 工程力学, 2009, 26(3): 168-175.
引用本文: 曹永红, 张新亮, 曹 晖, 李英民. 基于实用完备模态空间的两阶段损伤识别方案[J]. 工程力学, 2009, 26(3): 168-175.
CAO Yong-hong, ZHANG Xin-liang, CAO Hui, LI Ying-min. TWO-STAGE DAMAGE IDENTIFICATION SCHEME BASED ON PRACTICAL COMPLETE MODAL SPACE[J]. Engineering Mechanics, 2009, 26(3): 168-175.
Citation: CAO Yong-hong, ZHANG Xin-liang, CAO Hui, LI Ying-min. TWO-STAGE DAMAGE IDENTIFICATION SCHEME BASED ON PRACTICAL COMPLETE MODAL SPACE[J]. Engineering Mechanics, 2009, 26(3): 168-175.

基于实用完备模态空间的两阶段损伤识别方案

TWO-STAGE DAMAGE IDENTIFICATION SCHEME BASED ON PRACTICAL COMPLETE MODAL SPACE

  • 摘要: 利用结构模态参数构造指标进行损伤识别的方法研究较早,但能够敏感识别损伤并具有较好抗噪性的方法还很少见。在改进损伤变量和单元刚度折减系数的基础上,结合实用完备模态空间理论,提出了一种两阶段损伤识别方案,即先利用改进的损伤变量进行损伤定位,然后利用较少的前几阶模态振型扩充得到实用完备模态空间,结合改进的单元刚度折减系数方法进行损伤定量。分别选取了连续梁、桁架和框架仿真算例对单元刚度折减系数和该方案的识别效果进行了对比分析。结果表明:该方案的识别效果在仅采用少数前几阶模态的情况下明显更优,能在一定噪音程度下同时达到损伤定位和定量的目的。

     

    Abstract: Researchers have been constructing damage indicators with modal parameters to identify structural damage for a long time, and quite a few such indicators have been put forward. However, it is hard to find an indicator capable of detecting damage accurately under the effect of noise which is always associated with the modal parameters extracted from recorded signals. Based on improved damage variable indicator and elemental stiffness reduction factor (ESRF), utilizing the practical complete modal space theory, the authors propose a two-stage damage identification scheme. In the first step, the proposed scheme localizes damage by improved damage variable indicator. And then, a complete modal space is constructed with only a few lower modes, which is used to quantify damage with the improved ESRF. A few simulations including a continuous beam, a simple supported truss and a frame with different damage scenarios are selected as case study to compare the performance of the ESRF and the proposed scheme. The results show that the suggested scheme is better than the ESRF when only a few lower modes are utilized, and it can both localize and quantify damage at a certain noise level.

     

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