In some cases, impulse- or shock-type excitations as the dynamic loading are inevitable, and obtaining proper response with the well-known numerical methods is not easy. This paper focuses on dynamic response estimation against short-time loading with an updated finite element model using frequency response functions (FRF) and particle swarm optimization (PSO) technique. Because there is not an analytical method for assessing the numerical responses under shock-type excitations, in this paper, experimental tests are designed on a laboratory scale to evaluate the numerical responses. The vibration responses of the system against shock loading are compared with the Newmark average acceleration scheme and also with experimental data. The results reveal that the unconditionally stable Newmark method against regular loads has an appropriate performance. Still, under short-time loading, it faces numerical damping error, and this method should not be blindly applied under shock-type loads.

中文翻译：

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冲击型载荷下的振动响应评估，以有限元模型更新为重点

在某些情况下，作为动态载荷的脉冲式或冲击式激励是不可避免的，并且采用众所周知的数值方法获得适当的响应并不容易。本文着重于利用频率响应函数（FRF）和粒子群优化（PSO）技术更新的有限元模型对短时载荷进行动态响应估计。由于没有一种分析方法可以评估冲击型激励下的数值响应，因此，本文在实验室规模上设计了实验测试以评估数值响应。将系统对冲击载荷的振动响应与Newmark平均加速度方案以及实验数据进行了比较。结果表明，针对常规载荷的无条件稳定Newmark方法具有适当的性能。