变迎风面积载具运动轨迹及机构强度仿真研究
刘杰1，倪寿勇1，王志鹏2
（1.南京工业职业技术大学，江苏 南京 210023；2.桂林电子科技大学 机电工程学院，广西 桂林 541004）
摘要：针对一种发射后展开的变连杆机构载具，通过改变载具迎风面积，将其运动过程分为两个阶段，分别建立了不同的运动轨迹方程，通过初速度、射角以及迎风面积影响因素对载具的运动轨迹进行研究。迎风面积越小，其运动轨迹越接近抛物线，最大射角接近45°，随着迎风面积的增大，水平速度越小，载具落点或射程逐渐减小，最大射角逐渐减小前移。运用Flow Simulation流体仿真模块，对载具展开的结构流场进行了流体仿真分析，同时对载具的流场速度、流体密度进行了分析。将流畅仿真计算提取的阻力通过流构耦合方式添加至载具结构的静应力单元，对载具的关键结构并进行静力学分析，其中包含应力、应变及形变位移量，根据各个部件所选的材料，验证了零部件强度能够满足载具的发射展开时要求。
关键词：载具；展开机构；运动轨迹；流体仿真；静力分析
中图分类号：TP391 文献标志码：A doi：10.3969/j.issn.1006-0316.2020.06.004
文章编号：1006－0316 (2020) 06－0025－07
Simulation Study of Vehicle Motion Track and Mechanism Strength with Variable Windward Area
LIU Jie1，NI Shouyong1，WANG Zhipeng2
( 1.Nanjing Insititute of Industry Technology, Nanjing 210023, China; 2. College of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China )
Abstract：For a kind of launch vehicle with variable link mechanism, the motion process of the vehicle is divided into two stages by changing the windward area, and different motion trajectory equations are established respectively. The motion trajectory of the vehicle is studied by the factors of initial velocity, angle and windward area. The smaller the windward area is, the closer the trajectory is to the parabola, and the maximum angle is close to 45°. With the increase of the windward area, the smaller the horizontal velocity is, the smaller the falling point or range of the vehicle is, and the smaller the maximum angle of fire is. The flow simulation module is used to simulate the structure flow field of the vehicle, and analyze the velocity and density of the flow field of the vehicle. The resistance extracted from fluent simulation calculation is added to the static stress element of vehicle structure through fluid structure coupling method, and the key structure of vehicle is analyzed and statics is carried out, including stress, strain and deformation displacement. According to the materials selected by each component, the strength of components can meet the requirements of vehicle launching.
Key words：vehicle；unfolding mechanism；trajectory；fluid simulation；static analysis
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收稿日期：2020－02－24
基金项目：广西科技基地和人才专项（2018AD19078）；江苏省高等学校自然科学研究项目（17KJB460007）；南京工业职业技术大学科研基金项目（YK17-01-01，YK18-01-09）
作者简介：刘杰（1988－），男，山东东营人，博士研究生，讲师，主要研究方向为机械设计及推进技术，Email：2019101054@niit.edu.cn。
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