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中文摘要：
作为新型航天器姿态控制执行机构,磁悬浮反作用飞轮工作在高真空环境下且转子完全悬浮,使得热量不易散出,故需要对飞轮进行温度场计算并进行热优化设计。为此,提出一种有限元与热网络模型相结合的优化热设计方法：首先利用有限元法计算温度场分布;然后对不符合温度要求的部件建立热网络模型,分析影响温度的因素,提出优化措施。该方法具有计算精度高、优化速度快的特点。将该方法应用于某样机的热优化设计中,使飞轮的最高温度由121.6℃降到了52.7℃。对经热设计前后的两台磁悬浮反作用飞轮的实验研究证明了热设计的正确性,从而为磁悬浮飞轮系统的结构设计和热设计奠定了基础。
英文摘要：
As a novel type of actuator of the spacecraft for attitude control,the magnetically suspended reaction flywheel operates in a vacuum with its rotor suspended,making it difficult for its inner heat to dissipate,which results in the need for temperature calculation and thermal design.In this paper,a method composed of a finite element method and a thermal network is proposed as follows：first,the finite element model calculates the temperature distribution,and then the thermal network analyzes the factors that affect the higher temperatures and provides methods for optimization to enable the method to work precisely and quickly.The method is applied to the thermal optimization of a certain magnetically suspended flywheel,and is able to decrease its maximal temperature from 121.6 ℃ to 52.7 ℃.Experiments are carried out on flywheels with and without optimization,and the results prove the feasibility of the analysis.This study may serve as a basis for the structural and thermal design of a magnetically suspended flywheel system.
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