摘要
针对现有变自由度机构设计中存在以拓扑综合为主、系统研究机构设计过程不充分、创新程度不高等问题,引入进化理论完成变自由度机构的设计。首先,根据设计要求建立"源"树图模型;然后,利用进化计算扩展机构的形式得到欠驱机构的树图模型;最后,将树图模型转换为机构运动简图,通过筛选评价得到满足要求的变自由度机构。在此基础上,构建了一种变自由度机构设计原型系统,该系统包含需求分析、进化计算、评价筛选、设计知识库4个模块,实现了一定程度上的人机混合智能设计。以采摘机传动机构设计为例,验证了该原型系统的有效性及合理性。
Aiming at the problems in the existing design research of variable-degree-of-freedom mechanisms that mainly focused on topological synthesis and lacked of systematic research on its design process,the evolutionary theory was introduced to complete the design of variable-degree-of-freedom mechanisms.Firstly,according to the design requirements and pre-defined tree diagram structure,a“source”tree diagram model was established;secondly,evolution operations such as reproduction,crossing and mutation were used to expand the mechanism to obtain the tree diagram model of underdrive mechanism;finally,the tree model graph was transformed into mechanism movement diagram.The mechanism that met the axiom design criteria and motion requirements was obtained through screening and evaluation.Based on this,a prototype system for intelligent design of variable degree of freedom mechanism was constructed.The system included four modules of requirements analysis,evolutionary calculation,evaluation and screening,and database,which realized intelligent design.The realization process and programming steps of the system were used to illustrate the operation of each module.Taking the driving mechanism of picking machine as an example,the validity and rationality of the prototype system was verified.
作者
华尔天
鹿浩
李生辉
沈永康
汤守伟
HUA Ertian;LU Hao;LI Shenghui;SHEN Yongkang;TANG Shouwei(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Zhejiang University of Water Resources and Electric,Hangzhou 310018,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2021年第3期390-400,共11页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金项目(61772469)。
关键词
变自由度机构
进化设计
树图模型
原型系统
variable freedom mechanism
evolutionary design
tree graph model
prototype system
