多维虚拟振动试验系统设计及应用

Design and application of multi-dimensional virtual vibration testing system

虚拟振动试验能在产品设计阶段对其进行结构动力学分析和振动环境预评估,缩短产品研制周期,节省研制费用。本文完成了振动台机电耦合建模、刚体建模、试件有限元建模和闭环控制系统设计,建立了三维虚拟振动试验系统,开展了一维和三维正弦扫描虚拟振动试验技术研究。仿真结果表明:振动台机电耦合模型的频率特性与实际振动台的试验数据吻合;激振方向会对试件的加速度响应产生显著影响;与一维振动试验结果相比,多维虚拟振动试验不仅能明显提高故障激发效率,而且可以激发试件的高阶局部模态,使其高频段内的最大动应力曲线出现多个较高峰值且幅值增幅明显。

The virtual vibration test can be used in the product design stage to perform the structu- ral dynamics analysis and vibration environment assessment for products, shorten the product devel- opment time, and save the development cost. The vibration shaker electro-mechanical coupling mod- eling, rigid modeling, finite element modeling of test specimen and closed-loop control system design were fulfilled. The three-dimensional virtual vibration test system was established. The three-dimen- sional and one-dimensional virtual sine sweep vibration testing for the product is discussed separately. The simulation results show that the frequency characteristics of the shaker＇s electro-mechanical cou- pling model are close to the test results, the shock excitation direction has a significant effect to the acceleration response of the product, the multi-dimensional virtual vibration test can not only signifi- cantly improve the excitation efficiency of the structural faults, but also can inspire the high-order lo-cal modal, which can significantly increase its maximum dynamic stress amplitude in the high fre- quency band.