卫星热控系统的动态特性建模与仿真

受控对象的动态特性是卫星热控系统设计的基础,为了更加简便地进行卫星热控系统的动态特性计算,根据卫星各部分的温度变化特点及它们之间的热量传输关系,将其划分为外壳、辐射器、舱内环境、关键仪器设备以及相变蓄热装置5个集总参数热控环节,建立起各热控环节温度变化的数学模型.应用这一模型可以十分简便地计算内部热源强度及空间外热流变化时卫星各热控环节的温度变化趋势,其计算过程较常规的卫星瞬态温度场计算简单、方便,满足了对卫星热控系统进行仿真研究和控制策略优化的迫切需要,这对发展各种主动热控制技术来说具有尤其重要的意义.

Dynamical modeling and simulation of satellite thermal control system

Modeling and simulation of controlled-object temperature changes are necessary for developing satellite thermal control system. In order to calculate the dynamical properties of satellite thermal control system more easily, the whole satellite was divided into five lumped thermal control nodes, which included satellite's outer surface, heat radiator, indoor environment, key electrical equipment and phase change device. The heat transfer relationship between different nodes and temperature change properties of each part was carefully considered during the node dividing process. Mathematical models for temperature changes of each thermal control node were built and presented. With these dynamical models above, the key temperature changes of satellite, causing by either indoor heat source disturbs or outer side space heat flux varieties, could be calculated more simply and conveniently than using the common unsteady temperature field calculating method. This satisfies the stringent demand of thermal control system's control strategy optimization and its simulation. It's especially useful in developing active thermal control systems.