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传统基于姿控喷管的断续姿控系统多采用经典的斜线开关线设计非线性控制律,系统设计时往往难以同时满足姿控精度、推进剂消耗、喷管开关次数等要求和约束。为进一步优化系统设计,实现各性能指标闭合,提出了基于最优控制的断续姿控系统二次型开关线控制方法,并推导得到了系统姿控精度模型。通过仿真试验对比了传统斜线开关和二次型开关控制的性能。仿真结果表明,两种方法下系统姿控精度计算模型正确,性能指标各有优劣,姿控系统设计时可依据系统约束综合考虑选取不同方案。
Conventional attitude-controlled nozzle-based intermittent attitude control systems often use the classic slant line design nonlinear control law, the system design is often difficult to simultaneously meet the attitude control accuracy, propellant consumption, nozzle switching times and other requirements and constraints. In order to further optimize the system design and achieve closure of each performance index, a quadratic switch line control method based on optimal control was proposed and the model of attitude control accuracy was deduced. Through the simulation test, the performance of the traditional slant switch and quadratic switch control is compared. The simulation results show that the accuracy of the attitude and attitude control model of the two methods is correct and the performance indexes have their own advantages and disadvantages. When the attitude control system is designed, different schemes can be selected according to the system constraints.