基于拟静态初值的载荷识别数值修正算法

Numerical correcting algorithm for load identification based on quasi-static initial value

推导拟静态法获得载荷初值及稳定不发散计算结果,分析获得初值不准确原因,推导获得新的载荷识别方法。该方法基于数值原理,利用步步修正达到减少累积误差效果,可较大程度提高计算稳定性,并将数值迭代修正方法用于有限元模型载荷识别。结果表明,该方法能较准确识别出工程中常见的多种载荷,并具有一定抗噪能力。

A quasi-static method was presented to obtain the initial value of loading, which is a simple and quick algorithm to get stable and convergent results. The reason why the initial value of the algorithm would be not accurate was analysed, and a new load identification algorithm was deduced. The method is based on the principle of numerical algorithm arid uses the idea of step-by-step correction, which can reduce the effect of cumulative error and greatly improve the stability of calculation. This numerical iteration method was applied to the load identification of a finite element model. The results of simulation and experiment show that the method can accurately identify the common variety of loads in engineering, and it has a certain ability to resist noise.