The Simulation Study Of Influencing Factors Of The Harvesting Quality Of Cassava Roots Uprooted

Dig pull-type cassava roots harvester is one of the main harvest machinery,domestic and foreign scholars have carried out some research and yielded some results.However,there is no report about the research on that the effect of the roots uprooted speed,the gro.wth conditions of roots and the hardness of soil on mechanical uprooted harvesting quality(the maximum root uprooted force and the pull off loss)currently,while the relationship between the maximum root uprooted force and the maximum stress of cassava root is unknown.The design of mechanical pulling up speed control system is lack of basis.Therefore,to study the cassava roots uprooted harvesting quality influencing factors,has a great significance for the design of the control system of the cassava roots mechanical uprooted harvesting institutions,and for the development of promoting dig pull-type cassava roots harvester.In this paper,based on the coupling method of Lagrange and SPH,and quadratic regression rotation design method,we built the numerical simulation model of soil-cassava root-stalk system and carried out the root uprooted numerical simulation test.We also established the multi factor coupling mathematical model of the maximum stress of cassava root,the maximum root uprooted force and the uprooted speed,root growth conditions and soil hardness,and analyze the effect of influencing factors and their interaction on the maximum stress of cassava root and the maximum root uprooted force and determined the maximum pulling force which the root can not be pulled off.The results show that,the multi factor coupling mathematical model of the maximum cassava root stress,the maximum uprooted force and influencing factors with high precision,and can be used for analysis of the effect of the maximum root effective stress and the maximum pulling force;When a large pulling speed combined respectively with a small growth depth,a small root length,a large root diameter,the maximum root effective stress reaches the minimum;While a small pulling speed combined respectively with a small growth depth,a small root length,a small soil hardness,the maximum uprooted force reaches the minimum;the maximum root effective stress and the maximum uprooted force is not strong correlation,the maximum uprooted force being allowed is 0.92 KN.