考虑质量变化的空间拱结构小损伤识别方法研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (16) : 81-88.

论文

张效忠，孙国民

作者信息 +

A small-damage identification method for spatial arch structures considering mass variations

ZHANG Xiaozhong，SUN Guomin

Author information +

文章历史 +

摘要

该研究针对空间拱结构损伤识别精度问题，提出了一种空间拱结构小损伤的动态识别方法。该方法在识别过程中考虑损伤区的质量变化的因素来提高了结构损伤识别的精度。在建立的空间拱结构损伤模型中，应用频率和振型的质量因子变化来表示损伤区质量的变化。应用Wittrick-Williams算法对损伤参数进行计算，根据计算结果来判定结构的损伤位置和程度。为了实现应用最少的测量模态和结构振动特性数据对结构损伤精确识别，建立了一个应用遗传算法的优化计算程序对损伤参数优化计算。在该优化程序中，应用初始的随机染色体群代表沿空间拱不同的损伤分布状况。通过对单一损伤、多个损伤区域和不同边界条件下空间拱进行损伤识别案例对所述方法进行验证，并分析解决了对称结构损伤定位唯一性的问题。结果表明，所提出的识别方法对空间拱结构的损伤具有较好的识别效果，所建立的损伤识别程序具有较高的识别精度。

Abstract

In order to improve the accuracy of damage identification for spatial arch structures, a dynamic identification method for small damage of spatial arch structures was proposed. In the process of structural damage identification, the accuracy of structural damage identification was improved by considering the factors of quality change of damage zone. In the damage model of spatial arch structure, the change of mass factor of frequency and mode shape was used to represent the change of mass in the damage zone. Wittrick-Williams algorithm was used to calculate the damage parameters, and the damage location and degree of the structure were determined according to the calculation results. In order to accurately identify structural damage with the least measured modal and structural vibration characteristics data, an optimization calculation program based on genetic algorithm was established to optimize the damage parameters. In this optimization program, the initial random chromosome group was used to represent the damage distribution along the spatial arch. The method was validated by damage identification cases of single damage, multiple damage regions and space arch under different boundary conditions, and the uniqueness of damage location for symmetrical structures was analyzed and solved. The results show that the proposed method has a good identification effect on the damage of space arch structures, and the established damage identification program has a high identification accuracy.

导出引用

张效忠，孙国民. 考虑质量变化的空间拱结构小损伤识别方法研究[J]. 振动与冲击, 2020, 39(16): 81-88

ZHANG Xiaozhong，SUN Guomin. A small-damage identification method for spatial arch structures considering mass variations[J]. Journal of Vibration and Shock, 2020, 39(16): 81-88

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