木薯收获机土薯抖动分离装置性能仿真及试验  

Simulation and test on performance of soil-cassava jitter separation device of cassava harvester

作　　者：杨望[1] 张栩梓 杨坚[1] 郑贤[1] 廖丽[2] Yang Wang Zhang Xuzi Yang Jian Zheng Xian Liao Li(College of Mechanical Engineering, Guangxi University, Nanning 530004, China Department of Electro-machinery Engineering, Guangxi Agricultural Vocational College, Nanning 530007,China)

机构地区：[1]广西大学机械工程学院,南宁530004 [2]广西农业职业技术学院机电工程系,南宁530007

出　　处：《农业工程学报》2017年第16期18-25,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51365005);国家自然科学基金项目(51065003);广西高校现代设计与先进制造重点实验室主任课题(GXXD16ZD-02)

摘　　要：为了考察木薯收获机块根拔起时弹簧式土薯抖动分离装置的土薯分离机理和因素对分离性能的影响规律,优化性能影响因素,进行弹簧式土薯抖动分离装置动力学仿真试验。采用光滑粒子流体动力学和有限元的耦合方法及二次回归通用旋转设计方法,构建土壤-木薯-抖动分离装置系统的动力学仿真模型和影响土薯分离性能的回归数学模型,研究了木薯块根拔起时土薯抖动的分离机理及各影响因素对土薯分离性能的影响规律,同时,采用MATLAB优化工具箱中的fmincon函数,对性能影响因素进行了优化。结果表明,因素的优组合为:长孔长度2.68 cm、弹簧刚度20.04 kN/cm、弹簧预紧力335.2 N,相应的干净度为0.778,碰撞力为320 N,试验验证的干净度为0.698,与理论结果的相对误差较小,约为10%,理论结果与验证结果较一致,表明建立的回归数学模型及优化结果合理。研究结果可为土薯分离质量高的挖拔式木薯收获机弹簧式土薯抖动分离装置的设计提供参考。In order to obtain the soil-cassava separating mechanism and the effect laws of different factors on soil-cassava separating performance of spring type soil-cassava jitter separation device when the cassava tubers were lifted by cassava harvester,as well as the optimal values of factors,dynamics simulation model of soil-cassava jitter separation device system and regression mathematical model of separating performance of the device were established by using coupling method of FEM（finite element method） and SPH（smoothed particle hydrodynamics） and quadratic regression general rotation design method.The soil-cassava separating performance of spring type soil-cassava jitter separation device was studied.The effects of the length of long hole,spring stiffness and spring pre-tightening force on the soil-cassava separating cleanliness and the collision force between hanging scroll of spring below and long hole of sleeve above were discovered,respectively.Then,the influence factors of soil-cassava separating performance were optimized by using the fmincon function in the optimization toolbox of MATLAB software.Thus,the optimal combination of factors was obtained and the optimization result was verified by cassava tuber lifting experiment in the field.When the separation device was used in the field experiment,the average quality of the tuber-soil mixture was 5.835 kg,and the average quality of the residual soil on the tubers was 0.794 kg.When the separation device was not used in the field experiment,the average quality of the tuber-soil mixture was 7.998 kg,and the average quality of the residual soil on the tubers was 2.627 kg.The average clean degree in field experiment was 0.698.The results show that the regression mathematical models of soil-cassava separation performance are significant at 0.002 level.The regression coefficients are significant at the level from 0.001 to 0.028.The regression mathematical models are highly significant,which can be used in the study of soil-cassava separation performance of

关 键 词：机械化 模型 优化 木薯收获机 土薯抖动分离装置 仿真试验 

分 类 号：S225.71[农业科学—农业机械化工程]