摘要
为进一步提升电磁轨道发射器身管紧固的减振优化效果,采用模态分析法仿真确定紧固点的选取。在将电磁轨道发射器简化为伯努利-欧拉梁的基础上,进行振动响应分析和模态分析,通过建立发射器的有限元模型,模拟发射全过程,并依据临界速度时刻的系统刚度进行模态叠加,确定优化紧固位置并提出评估指标来评判优化效果。仿真实验表明,添加紧固能够有效提高发射器的刚度,且紧固的减振效果受到紧固位置的振动特性影响;紧固的位置选择应尽量避开临界速度的共振范围,在满足需求的前提下优先设置位于临界速度到达位置之前;添加紧固导致轨道邻近部位出现应力集中现象,提高了轨道强度要求。
In order to further improve the vibration reduction optimization effect of the electromagnetic rail transmitter body tube fastening,the modal analysis method is used to simulate the selection scheme of fastening point.On the basis of simplifying the electromagnetic orbit emitter into Bernoulli-Euler beam,the vibration response analysis and modal analysis are carried out,and the whole process of emission is simulated by establishing the finite element model of the transmitter.According to the system stiffness of critical velocity,the optimal fastening position is determined and the evaluation index is put forward to evaluate the optimization effect.The simulation results show that the addition of fastening can effectively improve the stiffness of the transmitter,and the vibration absorption effect of the fastening is affected by the vibration characteristics of the fastening position,and the selection of the fastening position should avoid the resonance range of the critical velocity as far as possible,and the position is located before the arrival position of the critical speed on the premise of meeting the requirements,the addition of fastening leads to the stress concentration in the adjacent parts of the rail to improve the rail strength.
作者
李腾达
冯刚
连仲谋
Li Tengda;Feng Gang;Lian Zhongmou(Air Force Engineering University,Xi’an 710051,China)
出处
《航空兵器》
CSCD
北大核心
2021年第4期69-75,共7页
Aero Weaponry
基金
国防科技基金项目(2201079)。
关键词
电磁发射
轨道
减振优化
模态分析
有限元仿真
electromagnetic launch
rail
vibration reduction optimization
modal analysis
finite element simulation
