Co-simulation Research Of Mechanic-electronics-hydraulics In The Cassava Harvester

Researches show that it can reach the purpose of reducing yield loss and improving efficiency at the same time by using the optimal velocity model of a machine pulls up a cassava root when the soil is loose,and soil property and cassava root growth is in common.But in the actual parcels which grow cassava,the hardness degree of soil and growth of every cassava root is different from a place to another,so it is difficult to achieve the purpose of reducing yield loss and improving efficiency at the same time by pulling up a cassaca root only with a optimal velocity model of a machine lifts a cassava root.Therefore,it is of great importance to reduce the yield loss and improve the efficiency by formulating a appropriate control scheme,and design the corresponding drive and control system to control the pulling up speed of a cassava root.In this paper,according to the predecessors’ research achievements about cassava harvest machinery basic theory,electro-hydraulic control theory and the co_simulation technique of mechanics-electronics-hydraulics,a control scheme of controlling the lifting speed so as to control the lifting force is developed based on the optimal velocity model of a machine pulls up a cassava root and the allowed biggest lifting force;and a electro-hydraulic drive and control system of the cassava harvester is designed;and a mechanics-electronics-hydraulics co_simulation model of the cassava harvester is built and verified;and a method that the CAM jitter mechanism of the cassava lifting device is driven directly by a DC motor and speed of the swing hydraulic cylinder is controlled by a fuzzy system to realize the control scheme is studied.Results show that the designed electro-hydraulic drive and control system works effectively,and the mechanics-electronics-hydraulics co_simulation model of the cassava harvester is accurate,and the method which realizes the control scheme is reasonable and it can reach the purpose of controlling the lifting speed by controlling the root lifting device of the cassava harvester.