考虑模型误差的动载荷反演问题研究

Dynamic loading estimation problem with structural model errors

动载荷反演分析技术应用于实际工程,除了受到测量响应中存在的测量误差影响外,还受到数值仿真模型与实际工程模型之间差异的影响,针对这一问题建立了考虑模型误差的动载荷反演时域分析模型,并提出了基于总体最小二乘的正则化求解方法。数值仿真表明,所提出的方法可以降低模型误差和响应噪声带来的影响。

When dynamic loading estimation techniques are applied to a real engineering, the estimation results are affected not only by the white noise in measured responses, but also by the difference between the numerical simulation model and the real engineering model. A dynamic loading estimation model considering errors associated with the measured responses and the structural model was established in time domain, and a regularization technique based on a total least square method was used to solve this dynamic loading estimation model. Numerical simulation results demonstrated that under certain conditions, this method can reduce the effects of these errors.