单轴虚拟振动试验技术研究

目的 探索结合有限元和闭环随机振动控制方法搭建的随机振动虚拟试验系统是否可信,以及其限制条件,并明确下一步的工作方向。方法 搭建虚拟振动,并获得虚拟试验结果,并和实物试验结果进行比对。分别搭建随机振动控制仪模型和振动系统有限元模型,再组合成整个闭环随机振动虚拟试验系统。对振动台、夹具、产品进行有限元建模后,再根据模态试验结果对其修正。振动台、夹具、产品的有限元模型修改到位后,组合成振动系统有限元模型,振动系统有限元模型联合控制仪模型,构建闭环随机振动虚拟试验系统,并将虚拟试验结果和实物试验结果进行比对。结果 在400 Hz之前的低频段,虚拟试验结果和实物试验结果的一致性较好。结论 这种方法搭建的虚拟振动系统,在400 Hz前的低频段,可信度较好。

Uniaxial Virtual Vibration Test Technology

The work aims to explore reliability and limitations of the virtual random vibration test system built by combining finite element method and closed-loop random vibration control method, and find out the next work direction. A virtual random vibration test system was built and the virtual test results obtained were compared with the physical test results. The whole process was as follows:A random vibration controller model and a vibration system model were built respectively, and then they were combined into a whole closed-loop random vibration virtual test system. In the controller modeling, the whole closed-loop control process and control principle of random vibration was introduced. In finite element modeling of vibration table, the finite element model of moving coil and boundary conditions were introduced. After finite element modeling of the vibration table, the fixture and the product, they were revised according to the modal test results. The ways to modify parameters of the finite element model so that the modal simulation results were consistent with the modal test results were introduced. The finite element models of the vibration table, the fixture and the product were combined into a finite element model of the vibration system after modification. The finite element model of the vibration system and the controller model were combined to construct a closed-loop random vibration virtual test system. The virtual test results were compared with the physical test results. The comparison results of the two were basically consistent in the low frequency band before 400 Hz. According to the comparison results, a summary and analysis were given in the end. It is concluded that the virtual test results of the virtual vibration system built by this method are relatively consistent with the physical test results in the low frequency band before 400 Hz. The future work is presented.