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以气门弹簧质量最小以及防共振性能最好为目标,以钢丝直径、弹簧直径、弹簧圈数为设计变量,以弹簧指数、弹簧强度、弹簧稳定性、弹簧尺寸等为约束条件,建立了某内燃机气门弹簧数学模型,并应用遗传算法求解了优化结果。考虑制造误差的影响,应用蒙特卡罗方法对气门弹簧的目标函数、约束条件的概率分布特征等进行稳健性分析。分析表明在给定的制造精度下气门弹簧稳健性差,合格率低。重新修正制造精度后,气门弹簧的稳健性能得到了极大的提高。这种方法为气门弹簧制造精度的确定提供了准确的依据。
In order to minimize the quality of the valve spring and the best anti-resonance performance, the design of a steel wire diameter, spring diameter and the number of turns of the coil as the design variables, the spring index, spring strength, spring stability, spring size as the constraint conditions to establish an internal combustion engine Valve spring mathematical model, and the application of genetic algorithm to solve the optimization results. Considering the influence of manufacturing error, the Monte Carlo method is used to analyze the objective function of the valve spring and the probability distribution of the constraint conditions. Analysis shows that the valve spring is poorly robust and has a low pass rate for a given manufacturing accuracy. The robustness of the valve spring has been greatly improved after the manufacturing accuracy is corrected. This method provides an accurate basis for the determination of valve spring manufacturing accuracy.