电磁谐振式高频疲劳试验系统动态特性分析

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Aimming at the problem for the analysis of the dynamic characteristics of electromagnetic resonance fatigue testing machine, the natural system frequency and workspace maximum amplitude were calculated based on the resonance vibration theory. The simulation analysis on the influence of sample stiffness to the natural system frequency and workspace maximum amplitude was performed, and the detailed instruction was given through graphs. In the last, the experiment platform based on virtual instrument was built. The result indicates that the experimental tiaras are accorded with the simulation results, which proves the correctness of the established dynamic model within the permitted error range. It has provided a high-precision control theoretical basis of frequency and work load of electromagnetic resonance fatigue testing machine, and which have certain engineering value is a benefit for engineers to do systematic forecasting analysis according to the model of the dynamic function.针对电磁谐振式高频疲劳试验系统动态特性分析的问题，根据振动学共振理论，建立了高频疲劳试验机振动系统的动力学模型，并且得出了系统的固有频率和工作台共振振幅的计算公式；同时通过仿真，分析了试件刚度对系统固有频率和工作台共振振幅的影响，并通过做图进行了详细的说明；最后搭建了基于虚拟仪器技术的实验平台，并进行了相关实验以验证所得卅的模型是否符合实际。研究结果表明，该系统的动态特性仿真结果与实验所得数据在误差允许的范同内能够较好地吻合，验证了动力学模型建立的正确性；为高频疲劳试验系统谐振频率的跟踪和工作载荷的高精度控制提供了理论基础，与此同时，工程人员可以依据这一模型对高频疲劳系统的动态性能进行预测分析，具有一定的工程价值。