动态载荷识别的自适应延迟逆模型方法

为减小载荷识别问题对原系统先验知识的依赖,采用系统的自适应延迟逆模型识别时域载荷。采用自适应算法辨识延迟逆模型,代替了一般识别方法中的系统特性矩阵求逆过程,避免了病态问题。随后将工作状态下的响应作为逆模型的输入,则其输出就是时域载荷的延迟估计。通过对两端简支梁结构进行载荷识别的仿真研究,以及对双层隔振试验台架的试验研究,识别了稳态激励和瞬态激励,验证了该方法的有效性。该方法不需要了解系统的数学模型及参数,因此能够应用于工程实践中。

Adaptive delayed inverse model approach for dynamic load reconstruction

In order to relieve the dependence of load estimation upon the prior knowledge of mechanical system, a novel approach is proposed to determine real time force by adopting adaptive delayed inverse model of mechanical system. Delayed inverse model is identified by adaptive algorithm instead of system charac-teristic matrix inversion in common determination methods and ill-posed problem is avoided consequently. And then according to the inverse model established, the output signal is delay estimation of operational force while operational response is the input of inverse model. Numerical simulation to simply support-ed beam and experiment to two-stage vibration isolation system were carried out to reconstruct time history of stationary and transient forces, and the feasibility of this method was verified. The proposed method can be applied in practical engineering as it is not necessary to grip the mathematical model and system pa-rameters in advance.