摘要
纳卫星运行于复杂空间热环境中,各种热量干扰、轨道外热流波动和舱内热源的散热都会影响整个星体的温度系统,因此制定合理的温度控制策略尤为重要。在纳卫星动态特性平衡方程基础上建立了主动热控系统模型。分别采用常规PID控制方法与模糊控制方法,对纳卫星温度控制系统进行了仿真研究。仿真结果表明,PID控制能消除稳态误差,满足一定的控温要求,但超调大,过渡时间长;模糊控制则能实时跟踪纳卫星温度变化,较快地达到控温目标值,虽然无法消除静态误差,但其综合控制效果比PID要好。
When Nano-satellite orbits in the outer space,different kinds of heat disturbance,orbit external heat flow fluctuation and instrument＇s heat radiation will influence its temperature system,so it＇s important to make a reasonable thermal control strategy.A model of Nano-satellite＇s active thermal control system was established based on the equations of dynamic characteristics.Simulation of temperature control system in the satellite was made by using PID and fuzzy control methods.The results show that PID control can eliminate steady-state error and satisfy the temperature demands,but the overshoot is big,transitional time is long.On the other side,fuzzy control can follow the change of the Nano-satellite＇s temperature,reach the target value swiftly.Although the fuzzy control can＇t eliminate steady-state error,its synthetic control quality is better than that of PID control.
出处
《计算机仿真》
CSCD
2008年第7期58-61,共4页
Computer Simulation
基金
国家自然科学基金资助项目(50506003)
关键词
纳卫星
主动温度控制
模糊控制
仿真
Nano-satellite
Active temperature control
Fuzzy control
Simulation
