| Under the background of the gradual shortage of global fossil energy and the continuous development of science and technology,the electric agricultural machinery has gradually developed because of its diverse sources of energy,relatively simplified structure,low noise and non-pollution.Based on the project of "small portable transport machinery product development" by the Chongqing Municipal Science & Technology Commission and the "adaptive transmission drive system of pure electric transport platform",this paper designed a small electric tracked field transfer vehicle("field transfer vehicle")suitable for hilly and mountainous orchard transportation.According to the design scheme,the field transfer vehicle is a pure electric vehicle.The driving system of the pure electric vehicle mainly includes the power battery,the driving motor and the transmission system.Comparing with the traditional diesel and gasoline vehicles,pure electric scheme has the disadvantage on mileage.It is related to the capacity of power battery,performance of driving motor and reasonable parameters of the drive system.In this paper,the design and optimization of parameter matching for the drive system of the field transfer vehicle is designed and optimized.Based on the analysis of the development status of orchard transport machinery in the hilly area,the research progress of the electric agricultural machinery,the research methods and the current situation of the matching optimization of the electric vehicle driving system,the technical route of this paper is determined.According to the project requirements,combine the investigation of the existing market orchard transport machinery,comprehensive consideration of user requirements and the size of related,parameters and structure layout of the field transfer vehicle have been design.On the basis,vehicle dynamics is analyzed and performance evaluation indexes are defined for the field transport.In the dynamic analysis,the operation efficiency of the tracked walking mechanism is analyzed.Then,according to the basic parameters and defined performance indicators,we initially completed the theoretical matching of the drive system,as well as the selection of motor and battery,and the design of transmission system.On the basis,Cruisesoftware is used to build a vehicle simulation model,and carried out the prototype and test.Compared the simulation results with prototype test results,It can be seen that the deviation between the test results of the sample car and the simulation is small,the power deviation is between 7.9~9.2%,and the speed deviation is between 0.4~1.5%.The analysis draws 3 conclusions: 1)it is feasible to use the Flange module and the Function module to simulate the crawler walking mechanism with the tire module;2)the built vehicle model is credible;3)preliminary matching scheme can meet the design requirements.At the same time,in order to make the model more accurate and more practical,the model is further modified by using the prototype test results.Finally,according to the fact that when the transport vehicle is in use,the actual load and road conditions change greatly.In order to obtain better dynamic and economic performance,and reduce the influence of load change on the vehicle output performance,this paper adopts Taguchi robust optimum design method for optimizing the parameters of the drive system,the prediction of optimal combination of parameters according to the Taguchi Method test results,and carries on the simulation analysis,compared with preliminary simulation results,the maximum speed decreased by 6.5%,and the energy consumption of 100 kilometers under the three load states decreased by5.63%,5.86% and 6.05%,respectively,and increased by 3.30% in the mean of the average performance target,and in the output SN ratio,it was more improved than the original scheme.It is proved that the optimization scheme is effective and feasible. |
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