超导磁悬浮复合材料储能飞轮转子优化设计

Analysis and optimization of an interference fitted composite material rotor of a superconducting energy storage flywheel

为了提高储能飞轮的储能密度,设计了一种金属轮毂和3个复合材料圆环过盈装配的磁悬浮外转子飞轮;采用平面应力方法建立了转子的应力模型,以复合材料圆环的厚度和环间过盈量为优化变量,以储能量为优化目标,在强度约束条件下,通过序列二次规划法对转子进行优化设计,将转子的极限转速从50000r/min提高到57797r/min,储能密度由40W·h/kg升高到53.8W·h/kg,储能量升高34.5%。该研究方法和结果可以为复合材料储能飞轮的设计、制造和优化提供依据。

To achieve a high specific energy density, a metal rotor without a shaft is designed to consists of a hollow hub and three composite cylindrical rings fitted in interference. A mathematical model is formulated for the stress distribution using a simplified two dimensional stress model. Optimization is carried out by using the total storage energy density as the objective function and the thickness of the composite rings and the interference value between rings as the variables. It is found that the optimization increases the upper limit of the rotor speed from 50000 r/min to 57797 r/rain, and the corresponding total storage energy capacity increases by 34.5%, from 1147 W.h to 1543 W.h.