基于模糊控制的纳卫星热控系统仿真

建立了球状纳卫星温度系统动态特性方程组,确定系统稳态温度值后搭建温度系统模型;设计合理的模糊逻辑控制器,与温度系统模型部分相结合,完成整个热控系统模型;分别采用±50%的阶跃信号模拟纳卫星温度系统在空间运行时受舱内仪器热源改变和外壳、辐射器所接受的太阳辐射加热量改变的影响,执行热控系统仿真,绘制仿真曲线与不加控制前的结果相比较.仿真结果表明,将模糊控制系统运用于纳卫星热控系统中能够准确、快速地对其系统温度进行合理控制,具有鲁棒性好、对参数变换不敏感、适应性强以及过渡过程时间短等优点. 

Simulation of thermal control system of nano satellite based on fuzzy control

A thermal system dynamic characteristics equation of a spherical nano satellite was built. And its temperature model was established after system steady temperatures were determined. A fuzzy logic controller was designed and combined it with the temperature model to complete the whole thermal control system. ±50% step interference signals were input respectively to simulate the nano satellite-s temperature changes, when instrument heat source changed and the endotherm from sun radiation by satellite surface and radiator changed. The simulation was carried, and the curves were plotted to be compared with the results had got without any controller. The simulation results show that fuzzy control technology can control the nano satellite temperature accurately and rapidly, and by using fuzzy control method, many good qualities ( such as good robust , insensitive to parameters changing , high adaptability and short transition process time) can be obtained.