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Research On Design And Simulation Of Orchard Wheel Weeding Machine

Posted on:2024-07-17Degree:MasterType:Thesis
Country:ChinaCandidate:Y N LiFull Text:PDF
GTID:2543307103490584Subject:Transportation
Abstract/Summary:PDF Full Text Request
The planting area of China’s large-scale orchards has been increasing in recent years.Orchard management is heavy.Weed treatment have lots of problems in orchards need to be solved urgently.Traditional manual weeding methods are inefficient.Using chemical weeding methods would pollute the environment and crops.And the mechanized weeding methods rely on large equipment,which has high requirements for working space,and imported equipment is expensive and inconvenient to maintain.The design and development of orchard wheel weeding machine is based on the current situation of orchard weed management for the purpose of reducing the labor of fruit farmers and protecting the orchard environment.It is of great significance to promote the large-scale development of orchards and improve the comprehensive management level of orchards.The preliminary design scheme of orchard wheel weeding machine is based on the research about development of weeding equipment and the types of weeds in orchards from China and overseas.It has two functions: parallel weeding and dip angle weeding.The 3D modeling of components and the assembly of the whole machine are carried out in CATIA.The chassis mechanism of the weeding machine is composed of double wishbone independent suspension,rear wheel suspension,chassis frame,etc.The weeding device is composed of a height inclination adjustment mechanism,a weeding knife,etc.The relevant technical parameters are obtained by theoretical calculation of the basic parameters of the weeding machine such as walking,steering and inclination adjustment.Weeding device static and modal simulation studies are based on ANSYS Workbench.The static simulation results of the optimized and improved integral weeding device obtained a maximum deformation of 0.13 mm and a maximum stress value of 32.34 MPa.The prestressed modal results of the weeding device show that there is no resonance during normal operation.The modal simulation of the weeding tool obtains the mode diagram and the limiting speed.The results show that the design speed of the tool is much lower than the limit speed of the first order,which verifies the rationality of the design of the weeding tool.The simulation study of obstacle crossing stability of the chassis mechanism of the lawn mower was carried out based on ADAMS.Typical obstacle types are determined by analyzing orchard land flatness.The chassis mechanism with or without suspension is simulated for convex and trench terrain overturning.The suspension chassis mechanism performs different terrain obstacle crossing simulation at different driving speeds.It is simulated for several obstacle crossings based on terrain with different parameters.The analysis results of the roll angle,pitch angle and deflection angle curve of the chassis mechanism show that the suspension system can significantly improve the running stability of the weeding machine.The simulation of the motion of the weeding device obtains the result map of the tool trajectory,displacement,velocity and acceleration.The analysis shows that the weeding machine can achieve no leakage cutting under different working conditions.Determine the technical parameters of the wheeled orchard weeding machine and complete the model assembly based on the above content.The power source of the weeding machine is brushless DC motor.The transfer function of brushless DC motor is derived.The speed control simulation analysis of fuzzy PID controller of brushless DC motor is based on MATLAB/Simulink module.Simulink and ADAMS joint simulation results show that the fuzzy PID controller can accurately control the operation speed of the orchard wheeled weeding machine.
Keywords/Search Tags:Wheeled weeding machine, Structural design, Finite element analysis, Dynamics analysis, Fuzzy PID controller
PDF Full Text Request
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