The Vibration And Damage Reduction Properties Study Of Orchard Transporter In Hilly Mountainous Areas

The hilly mountainous area is the main fruit growing base in China,and there are problems such as serious fruit damage during the transportation in the hilly mountainous orchard.In order to solve this problem,this paper takes the hilly mountain orchard transport vehicle as the research object,and uses a combination of theoretical analysis,simulation analysis and experimental verification to design a hilly mountain orchard transport vehicle with good vibration and damage reduction properties,so as to achieve the purpose of reducing the fruit damage rate and reducing the economic loss of fruit farmers.(1)According to the properties requirements,combined with the characteristics of hilly mountain orchard terrain,the whole vehicle design and vibration damping structure optimization design of hilly mountain orchard transport vehicle.The complete vehicle design includes power,travel mechanism and frame design.The design of vibration damping structure optimization includes the construction of vibration damping system model,calculation of vibration damping structure parameters and optimization of vibration damping structure.Based on the optimization of the vibration damping structure of the existing tracked transporters,an orchard transporter with a secondary vibration damping structure is designed.(2)Simulation and analysis of the vibration damping properties of the hilly orchard truck.The road surface model of the hilly orchard is constructed with reference to the literature and relevant national standards;the simulation and analysis are conducted for different structures and parameters of the truck in the hilly orchard.Conclusion: The vibration damping properties of the second-stage vibration-damping truck designed in this paper is 9.33% and 24.22% higher than that of the traditional single-stage vibrationdamping truck in Z-direction and X-direction respectively,and the vibration damping properties of the suspension after parameter optimization is 7.1% higher than that before optimization.(3)Simulation and analysis of damage reduction properties of orchard transport trolley in hilly mountainous areas.By analyzing the fruit collision process,we learned that the damage of fruit is more serious in the first stage of collision;we constructed a joint simulation model of dynamics and discrete elements for fruit transportation by cart,and simulated the stress of fruit in hilly orchards by cart with different damping structures.The fruit damage rate was found to be about 5% lower than that of existing carts.(4)To carry out the trial and test of the vibration and damage reduction prototype for hilly and mountainous orchards.The prototype of the transport vehicle is developed,the test plan is designed,and the correctness of the orchard transport vehicle dynamics simulation and discrete element simulation of fruit damage is verified through the test.The test results show that all parameters of the orchard transporter meet the requirements,and the relative errors of X-and Z-directional vibration reduction properties are 15.17%and 19.16%,respectively,and the relative error of damage reduction properties is 9.45%compared with the simulation results.Based on the above research,a hilly orchard transporter with two-stage vibration damping structure is designed,which is powered by electric motor and adopts a crawler travel mechanism.Compared with the traditional single-stage vibration-damping truck,the Z-direction and X-direction vibration-damping properties of the orchard transporter with two-stage vibration-damping structure is optimized by 9.33% and 24.22%respectively,and the fruit damage rate is reduced by 5%.The properties of vibration reduction and damage reduction is significantly improved,which can well meet the requirements of hilly mountainous orchard transportation.