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Dynamic Simulation and FEA of Tractor AMT

Author: LiuYiTao
Tutor: GuoZhiQiang; ZhouZhiLi
School: Henan University of Science and Technology
Course: Vehicle Engineering
Keywords: Tractor AMT Dynamic simulation FEA
CLC: S219.02
Type: Master's thesis
Year: 2012
Downloads: 97
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Abstract


The transmission is one of the key parts of tractor power train, to study thedynamic characteristics of transmission has an important significance on thetransmission and vehicle performances. Dynamic simulation and FEA are the maincontents of CAE, which can effectively replace physical prototype model and carry onexperimental-design work. Automated mechanical transmission (AMT) is a kind ofautomated transmission which is designed on the basis of the manual transmission.AMT make transmission to automatic gear shifting according to different situations,which adopt motor-driven or gas-driven or hydraulic-driven control system by usingthe modern control theory, sensing technology, microcomputer control technology andinformation processing technology. AMT make up for the manual transmission’sproblems, such as difficult shift and frequent operation, which has a good applicationprospect in tractor.The DFH-MG wheel tractor’s manual mechanical transmission is used as theresearch object in this paper, basing on the analysis of AMT working principles andimproving the shift arrangement form of original manual mechanical transmission,using the synchronizer to replace the meshing set shift mechanism and determining thetype of AMT’s control mechanism. The solid model of AMT’s parts and assemble isbuilt by using Pro/E’s parameterized design method, the correctness of the design isverified through the interference inspection and kinematics simulation analysis. Thefinite element model of the major parts of the AMT is built by using finite elementsoftware, the modal characteristics of the parts and the critical speed of the shaft isanalyzed, the mathematical model of gear collision and the rigid body dynamics modelof transmission are established, the transmission’s performance of transmission iscarried on the simulation analysis. Transmission’s soft body dynamic model isestablished by using input shaft modal neutral files, and the structural dynamiccharacteristics of transmission’s shaft is analyzed. The working process of thesynchronizer is described, the synchronizer simulation model is established, the simulation analysis is made to the designed synchronizer model, and verifying thecorrectness of the design parameters. A new idea about the design and analysis fortractor transmission is provided in this paper.

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CLC: > Agricultural Sciences > Agricultural Engineering > Agricultural power,rural energy > Tractor > General issues > Design, calculations,drawings
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