基于模态分析的液压挖掘机工作装置动态优化设计  

Dynamic Optimization Design for Working Device of Hydraulic Excavator Based on Modal Analysis

作　　者：李发宗[1,2] 童水光[1] 王相兵[1] 

机构地区：[1]浙江大学能源工程学系,杭州310027 [2]宁波工程学院机械工程学院,宁波315016

出　　处：《农业机械学报》2014年第4期28-36,共9页Transactions of the Chinese Society for Agricultural Machinery

基　　金：浙江省重大科技专项重大科技资助项目(2007C01006)

摘　　要：建立了液压挖掘机工作装置的结构有限元模型,通过对该有限元模型进行自由模态分析,得到工作装置的各阶模态频率和模态特性,确定影响液压挖掘机工作装置动态性能的关键模态频率,并以此作为优化目标,对主要结构参数进行灵敏度分析,以确定工作装置动态优化的设计变量。以工作装置几何约束、性能约束等为约束条件,采用扩展拉格朗日乘子法进行动态优化设计。实例分析表明,该动态优化方法,提高了工作装置结构的刚度,降低了结构的变形,改善了工作装置动态工作性能与结构稳定性。The structure finite element model for the working device of hydraulic excavator was established,and each order modal frequency and modal characteristics of working device were gotten by analyzing the free mode of the finite element model.The key modal frequency was determined,which influenced the dynamic performance of the working device,and taking the key modal frequency as the optimization goal the sensitivity analysis was conducted for the main structural parameters to set up the dynamic optimum design variables of working device.Taking the geometric constraints and performance constraints of work device as constraint conditions,the dynamic optimization design was conducted by using augmented Lagrangian method.The instance analysis showed that the structure stiffness was improved,and the structure deformation was reduced.And the dynamic working performance and the structure stability reliability for the working device were improved.

关 键 词：液压挖掘机 模态分析 工作装置 结构动态优化设计 扩展拉格朗日乘子法 

分 类 号：TU621[建筑科学—建筑技术科学] O327[理学—一般力学与力学基础]