摘要
针对火箭导弹发射过程中弹架间隙产生的初始扰动问题,提出随机扰动激励与多体动力学相结合的计算方法.该方法以多体动力学为基础,建立能够模拟导弹与发射架相互作用的动力学模型,将赫兹碰撞接触算法、随机过载模型与多体动力学模型相耦合,可计算获得初始扰动的响应参数.通过对含发射架的导弹实例分析,结果表明:此耦合模型能够有效模拟弹架间隙对导弹发射扰动的影响状态;导弹弹体支脚与发射架间的间隙过大,会导致导弹在发射过程中(离轨前)产生较大的随机扰动力,使得弹体在离轨后的Y向和Z向的姿态产生较大偏差,在发射离轨后产生较大的散布效应.该方法可为研究弹架间隙对发射扰动的影响提供有效的参考,也可以为同类导弹初始扰动的分析提供借鉴.
Aiming at the initial disturbance caused by the clearance between the shelves during the launching of rocket and missiles,a method combining random disturbance excitation with multi-body dynamics was proposed.Based on the dynamics of multi-body system,the launch dynamic model modeling the interaction between missile and launcher was established.The Hertzian collision contact algorithm and stochastic overload model were coupled to the multi-body dy⁃namics model.Through the simulation analysis of missile with launcher,the results show that the coupled model can ef⁃fectively capture the influence of the clearance of the missile frame on the missile launching disturbance.The larger the clearance between the missile body support and launcher,the larger the random disturbance force produced during the missile launching process(before derailment),thus leading to large attitude deviations of the projectile in Y and Z direc⁃tions after derailmentand also a big dispersion effect of the projectile after launching derailment.This method can pro⁃vide an effective reference for the study of the impact of the clearance of the missile rack on the launch disturbance,and also for the analysis of the initial disturbance of similar missiles.
作者
何泽鹏
张雁
赵良玉
傅德彬
李云峰
He Zepeng;Zhang Yan;Zhao Liangyu;Fu Debing;Li Yufeng(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;Qian Xuesen Laboratory of Space Technology,China Academy of Space Technology,Beijing 100094,China;Ministry of Technology,Jilin Jiangji Special Industry CO.,LTD.,Jilin 132021,China)
出处
《动力学与控制学报》
2021年第2期54-60,共7页
Journal of Dynamics and Control
基金
国家自然科学基金资助项目(11532002和11202023)。
关键词
弹架间隙
发射扰动
随机过载
多体系统动力学
shelf clearance
launch disturbance
random overload
multibody system dynamics
