动臂结构设计参数对智能优化约束处理的影响

摘要

The design parameters expression form of excavator boom structure directly affects the form of constraint model in the intelligent optimization.In the common expression of the boom structure due to the complicated and poor universality of the model expression,the geometry classification based on rules and characteristic matrix constraint model is used to avoid time-consuming too much in geometry constraint during the optimization process.This paper analyses the expression form of the various design parameters of the boom structure and changes the design parameters of the boom structure and based on the feasibility of the distnbution of the boom structure geometry caused by changing in the parametric modeling,it proposes a new design parameters expression form of the boom structure,which can be used to greatly simplify the constraint expression of the boom structure geometry,thus having no need to establish complex geometry constraint classification characteristic matrix model and improving the process speed.Meanwhile,under the new expression of the structure,the design parameters are not only better to be comprehensive sensitivity for the optimizing goal and stress constrains,but also greatly improve the universality and prediction accuracy of the boom structure's stress prediction model.In the end,an optimization example is used to illustrate the superiority of this design parameters expression form of the boom structure.%挖掘机动臂结构设计参数的表达形式直接影响智能优化约束模型的形式,常用的动臂结构设计参数的表达形式,为避免优化过程中几何形状约束处理耗时长等问题,采用基于规则和特征矩阵的几何形状分类约束模型,模型表达形式十分繁琐,通用性差.在分析不同动臂结构设计参数的表达形式,改变动臂结构设计参数,其参数化建模中改变动臂结构设计参数所产生的动臂结构几何形状的可行性分布规律的基础上,提出一种新的动臂结构设计参数表达形式,可简化动臂结构几何形状约束的表达方式,无需建立复杂的几何形状分类特征矩阵约束模型,提高约束处理速度.同时新的结构设计参数表达形式下的设计参数变量不仅对优化目标和应力约束的综合灵敏度更好,而且可提高动臂结构应力预测模型的通用性和预测精度.实例优化证明了该动臂结构设计参数的表达形式的优越性.