基于模态滤波器改进的动载荷识别模型

 基于模态滤波器概念提出了对载荷识别模态模型法的原理性校正方案,构造了动载荷识别的离散模态滤波器模型。以其他点激励代替常常不可达的实际工作输入点,通过建立系统的模态参数并相继在模态和物理坐标下的求解对动态载荷作出估算,可以避免经典模态模型法通常对结构或边界条件所作的修改和由于模态参数自身误差而导致的较大识别误差,实例分析表明该模型识别精度较高并具有普遍的工程适用性。

FORCE IDENTIFICATION MODEL IMPROVED BASED ON MODAL FILTER

Based on the conception of the discrete modal filter, a force identification model is proposed to emend the classical modal model method. By exciting at the other sites instead of the actual input points that are usually not accessible, identifying the modal parameters of the system and estimating the dynamic loads through computation under both modal and physical coordinates, the errors caused by the usual modification to the structure or the boundary conditions are consequently evitable with this approach. The result of the numerical experiment through a cantilever with impact load acted shows its good accuracy, and the reconstructed force by using the algorithm is consistent with the operational one.