齿轮齿条转向机构辅助评估系统的设计与开发  

Auxiliary evaluation system for gear-rack steering mechanism

作　　者：陶勇 褚长勇[2] 高泽峰 杨爱喜 吴欣[2] 万民伟 TAO Yong;CHU Chang-yong;GAO Ze-feng;YANG Ai-xi;WU Xin;WAN Min-wei(School of Geely Automobile,Hangzhou Vocational&Technical College,Hangzhou 310018,China;School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,China;Zhejiang Baoqi Automobile Co.,Ltd.,Huali Group,Hangzhou 311121,China;Hangzhou Shibao Auto Steering Gear Co.,Ltd.,Hangzhou 310018,China)

机构地区：[1]杭州职业技术学院吉利汽车学院,浙江杭州310018 [2]杭州电子科技大学机械工程学院,浙江杭州310018 [3]华立集团浙江宝琪汽车有限公司,浙江杭州311121 [4]杭州世宝汽车方向机有限公司,浙江杭州310018

出　　处：《机电工程》2021年第11期1402-1409,共8页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(51475130);浙江省自然科学基金资助项目(LY14E050025)。

摘　　要：齿轮齿条转向机构在实际设计校核过程中难以形成一个标准的仿真方案,且在极端工作条件下,对其性能进行评估的智能化程度不高,针对这些问题,借助于知识推理和有限元技术,对齿轮齿条转向机构辅助评估系统的关键技术进行了研究。首先,采用对象-属性-值三元组的知识表达模型,构建了转向机构系统知识库;然后,采用正向推理的策略,实现了转向机构仿真模型的智能配置生成,进而采用面向对象技术,对转向机构仿真流程的封装技术进行了研究;最后,构建了转向机构仿真的平台无关性模型,设计开发了转向机构辅助评估系统,并利用该系统对某型号齿轮齿条式转向机构进行了性能评估。研究结果表明:当扭矩达到300 N·m时,齿轮齿条啮合强度小于许用应力,满足设计要求;壳体应力达到261 MPa时,壳体断裂,通过优化使其应力下降到207 MPa,小于许用应力,满足了设计要求;采用自动化建模与仿真技术可以缩短50%以上的建模时间。It was difficult for the gear-rack steering mechanism to form a standard unified simulation scheme in the actual design and verification process,and its performance evaluation was not intelligent enough under extreme working conditions.Aiming at these problems,the key technology of auxiliary evaluation for gear-rack steering mechanism was studied based on knowledge reasoning and finite element simulation technology.First of all,the knowledge expression model of object-attribute-value triplet was adopted to construct the knowledge base of the system.The intelligent configuration generation of the steering mechanism simulation model was realized by the strategy of forward reasoning.On this basis,the encapsulation technology of steering mechanism simulation process was studied by object-oriented technology,a platform independent model of simulation for steering mechanism was constructed,and an auxiliary evaluation system for gear-rack steering mechanism was developed.The performance of a certain type of gear-rack steering mechanism was evaluated using this system.The results indicate that when the torque reaches 300 N·m,the meshing strength of the rack and pinion is less than the allowable stress,which meets the design requirements;the shell stress reaches 261 MPa,and the shell breaks;through optimization,the stress drops to 207 MPa,which is less than the allowable stress and meets the design requirements;automated modeling and simulation technology can reduce modeling time by more than 50%.

关 键 词：齿轮齿条转向机构 辅助评估系统 知识推理技术 面向对象技术 

分 类 号：TH132.41[机械工程—机械制造及自动化] U463.4[机械工程—车辆工程]