32级模块化Marx发生器机芯模态分析

Modal analysis of the 32-stage modular Marx generator

模态分析可以获得结构的动特性参数。对32级模块化Marx发生器机芯进行了力学特性仿真分析和模态试验,用以评估Marx发生器的力学环境适应性。首先,建立了模块化Marx机芯的有限元模型,获得了初步振型;其次,在自由边界条件下分别开展了Marx机芯整体模态试验、局部模态试验和传递特性试验,得到了整体和局部结构的模态参数。研究表明,模块化Marx机芯在23.58 Hz处出现整体一阶扭转;机芯局部结构固有频率较高;机芯在x,y,z三个方向的振动传递率的范围分别为5~15,6~10和10~35,为后续工程中Marx发生器机芯的针对性设计提供了参考。

The dynamic characteristic parameters of the Marx generator can be obtained by modal analysis.In this paper,the simulation analysis and modal experiment of the 32-stage modular Marx generator are conducted to evaluate its mechanical environment adaptability.Firstly,the finite element simulation model of the modular Marx generator is constructed,and the initial vibration modes are acquired.Secondly,under free boundary condition,the integral modal experiment,local modal experiment and transfer characteristic experiment are conducted respectively.In the end,the integral and local modal parameters are calculated.Results show that the 32-stage modular Marx generator has a first-order torsion at 23.58 Hz;the inherent frequency of local structure of the Marx generator is relatively high;the vibration transmissibility scopes on x,y and z axis are respectively 5−15,6−10 and 10−35.These conclusions provide reference to design Marx generator in later engineering phase.