基于高精度模态应变能法检测结构损伤的研究

Structural damage detection method based on effective modal strain energy

在模态应变能、完备模态应变能及高精度模态应变能法的基础上,提出了一种新的结构损伤诊断方法——高精度完备模态应变能法。本方法考虑了结构参数修改量高阶项的影响,同时将高阶模态对单元模态应变能变化的影响做近似处理,且用低阶模态表示。这样仅用低阶模态就可以准确进行结构的损伤定位和损伤程度评估,克服了现有方法精度不足且需要完备模态的缺点。数值仿真结果表明,在结构多种损伤情况即能够得到较满意的诊断精度,具有实际应用价值。

By discussing the methods based on modal strain energy, complete modal strain energy and Effective structural damage detection method, a new structural damage detection method, namely, Effective Complete Modal Strain Energy Method （ECMSE） , was proposed in this paper. In ECMSE, considering the high order of structural parameter modification, the higher modes term was expressed approximately by lower modes. Numerical experimental results illustrate that this method is simple and satisfying precision is obtained.