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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。
As a new spacecraft attitude control actuator, magnetic flywheel reaction flywheel work in high vacuum environment and the rotor is fully suspended, making the heat is not easy to emerge, so the need for the flywheel temperature field calculation and thermal optimization design. Therefore, an optimized thermal design method based on finite element and thermal network model is proposed. Firstly, the temperature field distribution is calculated by using the finite element method. Then, the thermal network model is established for the components that do not meet the temperature requirement, and the factors affecting the temperature are analyzed. Optimization measures. The method has the characteristics of high accuracy and high speed of optimization. The method is applied to the thermal optimization design of a prototype, the maximum temperature of the flywheel is reduced from 121.6 ℃ to 52.7 ℃. The experimental study of two maglev reaction flywheels before and after the thermal design proves the correctness of the thermal design, which lays the foundation for the structural design and thermal design of the magnetic suspension flywheel system.