Research On Key Technology Of Multifunctional Chassis For Self Propelled Plant Protection Machine

Plant protection Machine is a kind of large-scale agricultural machinery used to control crop pests and diseases,which has been widely used in agricultural production because of its high efficiency,small environmental pollution,high precision of drug application and small harm to human body.In China,the types of crops are complex and the farmland type is complex.The same type of plant protection machine is difficult to adapt to many kinds of crops and different regions,and then the emergence of seedlings and seedlings and so on.At the same time,the existing plant protection machines have difficulties in head adjustment and severe vibration of the fuselage in the field,and strict weight affects the efficiency and quality of the application.Aiming at the above problems,a self-propelled multifunctional chassis is designed,and its independent steering technology and active suspension technology are studied.First,based on the actual situation of domestic farmland and the main problems existing in the chassis of the planting machine,the overall chassis parameters and plans are determined.On this basis,a self-propelled multi-function chassis with adjustable ground clearance,active vibration suppression and four wheel distance can be reconciled.Secondly,the steering technology of self-propelled multi functional chassis is studied in detail.A self-propelled multifunctional chassis steering hydraulic system based on LUDV system is designed.At the same time,using AMESime simulation software,the modeling and Simulation of the steering hydraulic system are simulated and studied.The results show that the synchronization of each wheel group is good in the process of the system response and the steering angle is satisfied with the Ackerman steering theorem.Finally,the self-propelled multi-function chassis active suspension technology is further studied.A self-propelled multifunctional chassis active suspension mechanism and hydraulic system are designed.On this basis,the mathematical model of active suspension system is established,and an active suspension control strategy based on LQG optimal control algorithm and Backstepping algorithm is proposed.Secondly,the MATLAB/Simulink simulation software is used to compare the active suspension system with the passive suspension.The results show that the vertical acceleration,the suspension stroke and the tire dynamic displacement of the active suspension system are all better than the passive suspension system under the same road excitation.Finally,the control strategy of active suspension is experimentally studied through mobile offshore platform.The experimental results show that the active suspension control strategy can effectively suppress vehicle body vibration and increase vehicle ride comfort.The self-propelled multi-function chassis designed in this paper can be applied to a variety of agricultural machinery,engineering vehicles and logistics vehicles.It provides a reference and solution for the actual problems of the same kind of engineering.