火箭车水平助飞方案仿真及分析

The simulation and analysis for an rocket sled aided takeoff scheme

地面辅助起飞是大起降质量差飞行器的重要起飞方式之一。地面辅助起飞系统起飞过程工况复杂,对飞行器的俯仰角响应提出了更高的要求,传统研究通常采用数值计算的方法,计算量大,过程繁琐,结果不直观。针对以上问题,以大型飞行器"霍托尔"为背景,采用分段式建模的方法建立地面辅助起飞系统的动力学模型,运用LMS Virtual.Lab Motion和MATLAB/Simulink进行联合仿真,并设计了控制俯仰角的PID回路。仿真结果表明,采用该方法得到的动力学模型合理,俯仰角控制系统能对俯仰角实现有效控制,起飞系统工作过程稳定。

For the large aircraft whose takeoff weight is far higher than the landing weight,the ground aided takeoff system is a significant way to take off. The system has complicated operating conditions during taking off,so it puts forward higher requirements for the aircraft＇s pitch angle response. The traditional design method needs to build numerical computation model,which has a large calculating quantity and low efficiency. To solve these problems,this paper builds the dynamic model of the takeoff system using mechanical dynamics software LMS Virtual based on HOTOL,realizes co- simulation in Lab Motion and Matlab / Simulink. The dynamic model is divided into three phases to build and adopts PID control system to get better pitch angle response. The simulation result proves the dynamic model is reasonable and can achieve the effective control of the pitch angel. The work process of takeoff system is stable.