基础简谐激励试验的结构动力学仿真研究

将基础简谐激励试验中少数测点的测量数据结合有限元模型进行结构动力学仿真,可以节省试验时间与费用,方便快速地实现对结构的监控。本文的仿真研究基于动态矩阵变换技术,将少数测量点的测量动响应时间历程数据快速傅立叶变换后在频域下应用矩阵变换计算得到有限元模型缩聚自由度动响应,通过对缩聚自由度动响应数据逆快速傅立叶变换以及缩聚转换矩阵反变换,得到了有限元模型全部自由度动响应时间历程。本文以某工程结构为例进行了仿真,仿真结果与试验结果具有较好的拟合性,验证了本文仿真技术的可行有效性。

Research on structural dynamic simulation of basic harmonic excitation test

The structural dynamic simulation of basic harmonic excitation test is carried out by combining the measure data of few test points with the finite element model so that test time and expenses can be saved and structural monitor can be realized expediently and fleetly.In this paper,simulation research is based on the dynamic matrix transform technology,the dynamic response of reduction free-degree in the frequency domain is calculated by matrix transform after Fast Fourier Transform is implemented to the dynamic response time history data of few test points,Inverse Fast Fourier Transform is implemented to the dynamic response data of reduction free-degree,then the dynamic response time history data of the whole free-degree of the finite element model can be obtained by inverse transform of reduction transform matrix.The simulation on an engineering structure in this paper is done and the simulation results coincide with the test results,so the feasibility and effectiveness of the simulation technology of the paper is demonstrated.