针对磁悬浮飞轮用一次性锁紧装置不可重复锁紧/释放的缺点，提出了一种基于电机、碳纤维弹片和钢丝绳的可重复锁紧装置，并给出了锁紧装置的结构和工作原理。根据执行锁紧过程碳纤维变形状况，将其分为弯曲变形和受压变形两个阶段，并在此基础上对锁紧装置进行了受力分析。利用多学科优化软件iSIGHT集成有限元分析软件对碳纤维弹片进行了优化设计，以材料强度、结构反力和共振频率多学科要求同时作为约束条件，采用针对离散变量的全域遍数法嵌套连续变量的序列二次规划法对碳纤维弹片质量进行优化。优化结果显示，碳纤维弹片个数为12时，碳纤维质量达到最小为46 g，比初始质量112 g减少了59%。结果表明，该优化方法提高了锁紧装置设计的可靠性和效率，对飞轮系统整体优化设计有重要意义。

To remedy the defect of an one-off locking device which can not repeat locking or releasing for a magnetic bearing flywheel, a novel repeated locking device based on the motor, extension and shrinkage mechanism was proposed and the composition and working principles of the locking device were introduced. According to the deformation of carbon fiber, the locking process of locking device was divided into stages of bending and compressing, and its mechanical property was analyzed. The software of Multidisciplinary Design Optimization (iSIGHT) combined with the finite element analysis software (ANSYS) were applied to the optimization of carbon fibers. Then,by taking the structural strength, structural force and the resonance frequency as constraints, the carbon fiber was optimized by using the method of point-by-point comparing at macrocosm combined with the sequential quadratic programming method. The result indicates that the mass of carbon fiber reaches minimum by decreasing from 112 g to 46 g (is reduced by 59%) when the number of carbon fiber slices is 12. It is concluded that the method improves the reliability and efficiency of locking device designed, and has important significance in the optimization design of flywheel systems.