某舱外载荷设备热控设计及验证OA

In order to solve the problem of frequency stability and transmission accuracy decrease caused by temperature fluctuation during on-orbit operation of an extravehicular load equipment,a high-ly efficient thermal control scheme is proposed which bases on passive thermal control as the main ap-proach and active thermal control as the auxiliary method.The scheme employs a single-phase liquid cold plate as the main heat dissipation surface,and 10-unit multi-layer insulation components for com-prehensive encapsulation.High thermal conductivity materials are utilized to achieve efficient heat con-duction.Simultaneously,heating sheets and TEC semiconductor ceramic sheets are used for precise tem-perature control.Through finite element simulation analysis of temperature distribution under both high and low temperature conditions and optimization design,the temperature variation of key components is controlled within±0.5 K.The ground constant-temperature thermal balance experiment and the in-or-bit data results indicate that this scheme effectively suppresses the interference of temperature fluctua-tions on the load equipment,significantly improves the overall temperature uniformity of the equipment.It enables photodiodes and other sensitive devices to operate within the optimal temperature range(25-50℃).The temperature change rate of temperature-sensitive devices on the extravehicular load equip-ment is better than 0.1 K·min-1,meeting the on-orbit stability requirements of high-precision time-fre-quency transmission systems.It can provide an important reference for the thermal control design of similar space load equipment.