准瞬态/稳态对瞬态温度逼近度分析

对航天器准瞬态或稳态与瞬态热网络方程的解的差异进行研究,以基于温度解周期平均值的温度逼近度为考察目标,在航天器系统级热网络模型上针对不同因素对温度逼近度的影响进行了分析。结果表明,对于航天器内部温度,瞬态、准瞬态和稳态三种方程得到的温度的平均值不存在差异,由此证明采用周期平均热源的热平衡试验方法不会导致试验温度与飞行温度的差异。

Investigation of Deviation between Quasi-transient/Steady State and Transient Model

The temperature deviation based the periodically averaged was defined to evaluate the temperature differences between quasi-transient/steady stale and tansient spacecraft thermal models.The effects of various factors on the temperature deviation were investigated for a spacecraft thermal network model.It is revealed that the deviation approaches 0 for inner parts,thus hinting the substitution of periodically averaged heat source for transient one in thermal balance test does not result in the temperature deviation between test and flight.