火星降落伞开伞控制算法研究

Research on the Parachute Deployment Algorithm for Mars Exploration

针对火星再入过程中降落伞开伞策略问题,研究了基于过载的自适应开伞控制方法。首先建立了着陆器六自由度动力学模型,分析了火星再入弹道特性;然后利用弹道过载、动压和马赫数之间的相关性,研究了基于特定时间间隔的自适应开伞控制方法;另外,考虑到火星再入过程的不确定性,采用Monte-Carlo随机数值试验方法,分析了大气密度、进入角、轴向力系数、法向力系数、俯仰力矩系数和转动惯量等随机参数作用下开伞控制方案的可行性;最后,对比了传统和自适应开伞控制方案的统计概率特性。自适应开伞算法和仿真成果可指导未来深空探测任务中降落伞减速设计问题。

In this paper,parachute deployment algorithm is discussed for Mars exploration.The 6-dof dynamic models are established to investigate the ballistic re-entry process.Adaptive trigger method for parachute deployment is presented using time interval according to g-load measurements.The deviations of atmosphere density,entry angle,axial-force coefficient,normal-force coefficient,pitching-moment coefficient and moment of inertia are regarded as disturbers,and a Monte Carlo analysis is performed to statistically assess the presented parachute deployment algorithm.The parachute triggering algorithms and simulations can provide references to design,analysis and research on relative problems for deep space exploration.