| The self-propelled paddy field boom sprayer is prone to sinking,slipping and tilting due to deep mud feet,uneven ground,and high resistance in the paddy field,which reduces the efficiency of rice plant protection operations.The chassis frame of the self-propelled paddy field boom sprayer driven by hydraulic pressure is hereinafter referred to as the hydraulic chassis frame.It has the advantages of compact structure and convenient power adjustment,etc.It is widely used in rice plant protection machinery.The hydraulic chassis frame has a large mass ratio,and reducing its mass makes the self-propelled paddy field sprayer lightweight not only can effectively improve these problems,but also greatly improve the efficiency of rice plant protection operations.Therefore,in this paper,to ensure that the strength and deformation of the hydraulic chassis frame are within the design requirements,the lightweight research on the hydraulic chassis frame is carried out with the smallest mass of the hydraulic chassis frame,so that the hydraulic chassis frame can achieve the goal of lightweight.The main research contents of the thesis are as follows:(1)The development status of self-propelled paddy field sprayer at home and abroad and the research status of lightweight chassis frame were summarized and analyzed.The lightweight research was carried out on the hydraulic chassis frame of a self-propelled paddy field sprayer.(2)According to the structural characteristics of the hydraulic chassis frame,a three-dimensional parameterized model is established,and it is simplified reasonably.On this basis,combined with the finite element software for reasonable pre-processing,the finite element analysis model of the hydraulic chassis frame is established,and the static analysis and stress test of the hydraulic chassis frame are carried out to analyze the force of the chassis frame and the deformation conditions provide a theoretical basis for the lightening of the chassis frame in the following article.(3)The modal analysis and corresponding vibration tests of the hydraulic chassis frame were carried out,and the corresponding vibration frequencies were obtained,which verified the accuracy of the finite element analysis model,and provided a reference for the subsequent lightweight design of the hydraulic chassis frame.(4)The theoretical analysis of the lightweight of the hydraulic chassis frame was carried out,and the mass,strength and displacement of the hydraulic chassis frame were determined to be the multi-objective optimization function.Through parameter sensitivity screening,the dimensional variables of each beam of the hydraulic chassis frame that have a greater impact on the optimization objective function are obtained.In order to ensure that the maximum deformation of the hydraulic chassis frame and the maximum stress on the hydraulic chassis frame are within the design requirements,with the goal of minimizing the mass of the hydraulic chassis frame,a mathematical model for the lightweight of the hydraulic chassis frame is established,which will be referred to as the following hydraulic chassis vehicle The light weight of the frame makes the pavement.(5)The fuzzy matter-element method and its related applications are introduced,combining the finite element analysis and the lightweight mathematical model of the chassis frame to obtain 7 groups of candidate points after the chassis frame optimization,and establishing a 7-dimensional composite fuzzy matter-element judgment matrix of8 things.Then the fuzzy matter-element method based on entropy weights comprehensively evaluates and analyzes each group of optimization schemes,establishes the membership matrix of the hydraulic chassis frame,and calculates the entropy weight of each group of evaluation indicators.Comparing the pros and cons of each group of solutions,the best solution for lightweight hydraulic chassis frame is finally obtained.Comparing the optimized performance parameters of the hydraulic chassis frame with the corresponding initial values,it was finally obtained that the quality of the hydraulic chassis frame was reduced by 17% within the design requirements of the hydraulic chassis frame.Reached the goal of lightweight. |
PDF Full Text Request