航天器大型复杂构件真空除气装备系统热设计

为完成某型号大型复杂构件的真空烘烤除气任务，开展大型真空烘烤除气专用装备研制。设计完成的装备通用性良好，有效容积为ϕ3100 mm×5500 mm，极限真空度优于2×10-4 Pa，最高加热温度＞150 ℃。根据构件表面均匀分布的113个温度测点在真空烘烤除气作业过程中的测试数据，温度平衡时构件表面温差仅3.0 ℃，24 h内的温度波动＜3.0 ℃。研究表明：铠装加热丝加热方案更适用于大型真空烘烤除气装备的研制；增设二次辐射屏可以降低构件温度波动；变功率加热方案具有更稳定的控温性能，可以避免PID控温方案可能存在的温度过冲问题。

Thermal design of a vacuum degassing equipment system for large complex components of spacecraft

A large-scale specified equipment for vacuum baking and degassing is developed for a large complex component in an aerospace model, with an effective volume size of ϕ3100 mm×5500 mm, and an ultimate vacuum degree better than 2×10-4 Pa; and the maximum heating temperature of no lower than 150 ℃. According to the data from 113 temperature measurement points evenly distributed on the surface of the component during the vacuum baking and degassing operation, the temperature difference on the component surface is only 3.0 ℃, with a temperature fluctuation of less than 3.0 ℃ within 24 h. Theoretical analysis finds that the heating scheme of the armored heating wire is effective for the development of such kind of equipment; the additional secondary radiation screen can be used to reduce the temperature fluctuation on the component surface; the adjustable power heating scheme can well stabilize the temperature control performance and can avoid possible temperature overshoot, as is inevitable in the PID temperature control scheme.