基于虚拟样机与模糊可靠性的弹簧优化方法

Spring Optimization Method Based on Virtual Prototype and Fuzzy Reliability

智能塑壳断路器操作机构的驱动弹簧是极其重要的零件,对断路器的主要性能有很大影响,为了提高断路器的分断能力和使用寿命,提出一种虚拟样机与模糊可靠性相结合的弹簧优化方法。首先利用断路器操作机构虚拟样机参数化模型,以手柄操作力为约束条件,动触头主轴平均分断角速度最大为目标函数,优化弹簧刚度系数。然后以弹簧模糊可靠度为约束条件,弹簧质量最轻为目标函数,建立弹簧的模糊可靠性优化数学模型,优化弹簧的结构参数。优化后的弹簧疲劳强度可靠度为0.999 9,质量减轻13.33%,动触头分断速度提高20.81%。符合智能断路器的高可靠度、小型化和分断能力强的要求。

The drive spring of the intelligent molded case circuit breaker operating mechanism is an ex- tremely important part, it has a great effect on the circuit breaker main performance. In order to improve the circuit breaker breaking capacity and service life, the combination of virtual prototype and fuzzy reliabil- ity optimization method for the spring is presented. First, the use of circuit breaker operating mechanism parametric virtual prototype model optimizes the spring stiffness coefficient, which used the handle opera- tion force as a constraint and the maximal average angular velocity of the moving contact main shaft as an objective function. Then, the spring fuzzy reliability optimization mathematical model was established to optimize the structural parameters of the spring, which used the lightest spring mass as the objective func- tion and the fuzzy reliability as the constraint conditions. The optimized spring fatigue strength reliability is 0. 9999, the spring mass is reduced by 13.33%, and the moving contact breaking speed is increased by 20. 81%. The results are consistent with the intelligent circuit breaker with high reliability, miniaturiza- tion and high breaking capacity.