供弹系统升降平台的有限元模态分析  

Finite element modal analysis on the elevating platform of ammunition feed system

作　　者：郭春阳[1] 胡逢源[2] 祁松[1] 芦晨军 谢婷婷[1] 孙军超 

机构地区：[1]哈尔滨工程大学机电工程学院,黑龙江哈尔滨150001 [2]上海船舶设备研究所,上海200031

出　　处：《应用科技》2015年第6期20-25,共6页Applied Science and Technology

基　　金：国家自然科学基金资助项目(NO.51175099)

摘　　要：为改善供弹系统升降平台的动态特性,减小振动对供弹精度以及供弹速度的不良影响,利用有限元软件ANSYS/Workbench建立滚珠丝杠和升降平台的有限元模型并且进行模态分析,在此基础上对升降平台整机进行谐响应分析,得到仿真结果:丝杠的工作转速远小于模态分析中的第一阶固有频率,因此不会发生共振,满足设计的要求;弹箱底板在各阶振型中的振动比较严重,应该增加底板的厚度、减小底板内腔的尺寸从而增加底板的刚度;当外界动载荷的频率接近101 Hz时,振幅迅速增大,振动时系统的应力主要集中在丝杠和轴承接触处、螺母安装座及电机安装底板处,可以通过增加滚珠丝杠的刚度以及螺母和电机安装座的刚度来减小振动幅度。优化了升降平台的设计,提高了抗振能力。In order to improve the dynamic characteristics of the elevating platform of an ammunition feed system and to reduce the bad effect of vibration on the accuracy of ammunition feed and the speed of ammunition feed,the finite element software ANSYS / Workbench is used to establish a finite element model of ball screw and lift platform and do modal analysis. On this basis,by doing harmonic response analysis on complete machine of the platform,the simulation result is obtained. The simulation results： the working speed of screw is much less than the inherent frequency at the first stage in modal analysis,and thus the resonance is not going to happen,meeting the design requirement; the vibration of the bottom plate of ammunition box is serious in all stages and vibration types,and the thickness of bottom plate should be increased and size of cavity of bottom plates should be reduced,to increase the rigidity of bottom plate; when the frequency of the external dynamic load is close to 101 Hz,the amplitude increases rapidly,and during vibration,the stress of system is mainly focused on the connection position of screw and bearing,platform for installing nut and bottom plate for installing electrical machines. By increasing the rigidity of ball screw and platform for installing nut and electrical machine,the amplitude can be reduced. The design of the elevating platform is optimized and shockproof ability is enhanced.

关 键 词：滚珠丝杠 升降平台 模态分析 谐响应分析 抗振 供弹系统 

分 类 号：TJ818[兵器科学与技术—武器系统与运用工程]