中文摘要：

针对三轮高地隙喷药机田间运行稳定性差和后轮轮距调整不方便等问题,设计了万向节动力转向机构、可伸缩车架及后轮转向机构等部件组成的微型高地隙喷药机。对机架进行了仿真模型建立、有限元应力-应变分析和响应曲面拟合优化设计,并对优化后模型进行了模态分析。结果表明：机架在满足性能和强度要求前提下实现了轻量化,整机各个机构匹配性能均满足设计要求,且车体运行平稳,后轮轮距调整方便,有利于三轮高地隙喷药机的应用与推广。

英文摘要：

According to the problem that the field operation instability and the rear wheel base adjustment inconvenient of the three wheeled high clearance sprayer, the research design a new-type high clearance sprayer, with the power steering of scalable universal joint, retractable frame, the rear wheel steering mechanism and other components. Meanwhile, the simulation model, the finite element analysis for the stress and strain, response surface fitting optimization design on the sprayer frame have been finished, and the optimized model for modal analysis. Therefore, the results showed that, the frame realized the lightweight on the premise of the demand of performance and stiffness, each mechanism＇ s matching performance of sprayer meet the design requirements, and the research will be good for the popularization and application of the three wheeled high clearance sprayer.