空间载荷机柜热控设计的仿真研究

空间站主动热控系统的作用是提供和保持航天员、仪器设备和结构部件所要求的温度、湿度和风速等热环境。本文以空间载荷机柜为热控系统的基本单元，建立了以单相流体循环回路为基础、采用液冷结合风冷的冷却方式的载荷机柜数学模型；介绍了模糊增量控制算法的工作原理；提出了采用模糊增量控制算法，以液冷支路进出口温差和风冷支路冷却量占总冷却量的比值为控制目标的反馈控制策略。同时文章采用数值模拟方法研究了控制系统的动态响应效果。仿真结果显示，模糊增量控制算法具有响应迅速、超调量小、无静态误差的特点，控制策略满足有效性、稳定性和高精确度的要求。

Simulation Study on Thermal Control Design of Payload Rack for Space Station

Payload racks are designed to provide common interfaces for users on the Space Station. Thermal control system is necessary for payload rack to prevent equipment from overheat. A feasible control strategy, using temperature difference of inlet and outlet as the feedback variable for water-cooled branch, and percentage of the heat dissipation by air accounting for the total heat dissipation (water and air) as the feedback variable for air-cooled branch, is proposed in this paper. The working principle of the fuzzy incremental control algorithm (FIC) is introduced and applied in the thermal control system. The thermo-hydraulic model of rack with combination of air-cooling and water-cooling is also presented in this paper. The dynamic response of the control system is investigated by simulation. The simulation results show that FIC takes advantages of no steady error, small overshoot and fast response. The control strategy is demonstrated to be effective, stable and of high accuracy.