论文部分内容阅读
针对大型结构局部损伤识别指标灵敏度不高的问题,提出了基于模态应变能曲率差的结构损伤识别方法。利用局部结构的振型和质量矩阵以及固有频率,求出单元模态应变能曲率差,并将该指标应用于损伤识别中。数值算例表明:该指标可以有效地定位损伤,并能定性描述损伤程度,且具有一定的抗噪性能。最后,将该方法应用于某发射台模型损伤识别的试验研究中,实测数据分析验证了该方法的有效性。
Aiming at the problem that the sensitivity of large structural local damage identification index is not high, a structural damage identification method based on the difference of modal strain energy curvature is proposed. Using the mode shapes and mass matrices of the local structures and the natural frequencies, the difference of the unit modal strain energy curvature can be obtained and applied to the damage identification. Numerical examples show that this index can effectively locate the damage, and can qualitatively describe the degree of damage, and has some anti-noise performance. Finally, the method is applied to the experimental study of damage identification of a launch pad model. The measured data verify the effectiveness of the method.