Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (10): 3038-3044.doi: 10.13229/j.cnki.jdxbgxb.20211359

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Design of assembly system for tractor transmission based on virtual reality

Fan YANG1(),Zhi-qiang ZHAI1(),Yuan-yuan WANG2,Zhong-xiang ZHU1,Yue-feng DU1,En-rong MAO1   

  1. 1.College of Engineering，China Agricultural University，Beijing 100083，China
    2.Beijing Foton Cummins Engine Company，Beijing 102206，China
  • Received:2021-12-09 Online:2023-10-01 Published:2023-12-13
  • Contact: Zhi-qiang ZHAI E-mail:yf1762773980@163.com;zhaizhiqiang@cau.edu.cn

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Abstract:

Aiming at the problems of complex assembly process， high cost and long product development cycle of tractor gearbox， this paper studies the assembly technology of tractor gearbox based on virtual reality， and develops a virtual assembly system of tractor gearbox with characteristics of immersion， imagination and interaction. Firstly， the construction method of gearbox virtual reality model was studied， and the assembly information of tractor gearbox was extracted from CAD system by means of model data conversion， and the assembly information hierarchical model of tractor gearbox was established in the virtual assembly environment. The lightweight virtual reality model was obtained by using Mesh merging and geometric element deletion. Secondly， virtual assembly software is developed in Unity3D environment based on C# language to realize the functions of transmission parts in virtual assembly environment， such as movement， rotation， positioning assembly， scene roaming， sound playback， parts name display， assembly path planning， etc. Finally， Oculus Quest2 head-mounted display was used as interactive equipment to carry out tractor gearbox assembly test. The experimental results show that the developed gearbox virtual equipment system runs smoothly， the model interaction is accurate and the user operation experience is good， which helps to shorten the gearbox virtual assembly cycle and reduce the development cost.

Key words: vehicle engineering, virtual reality, gearbox assembly, mesh simplification, assembly path planning

CLC Number: 

  • TP391.4

Fig.1

Information structure of gearbox assembly model"

Fig.2

Synchronizer model Mesh merge"

Fig.3

Schematic diagram of triangle surface deletion method"

Fig.4

Flow chart of triangle surface deletion algorithm"

Fig.5

Triangle surface simplification effect"

Fig.6

Flow chart of collision detection algorithm"

Fig.7

Schematic diagram of collision detection"

Fig.8

Schematic diagram of the two-end search method"

Fig.9

Flow chart of two-end search algorithm"

Fig.10

Oculus Quest2 headset display and gamepad"

Fig.11

Flow chart of mobile function and rotation"

Fig.12

Process of model positioning"

Fig.13

Virtual assembly model of the transmission"

Fig.14

Virtual assembly of a transmission shaft"

Fig.15

Virtual assembly of a transmission shell"

Fig.16

Bearing assembly path before optimization"

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