Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (4): 1236-1245.doi: 10.13229/j.cnki.jdxbgxb20180229

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Significance variation of factorial effects on tractor stability employing scale⁃model⁃based experimental approach

Jia⁃hao QIN1,2(),Zhen LI1,2,Muneshi MITSUOKA3,Eiji INOUE3,Zheng⁃he SONG1,2,Zhong⁃xiang ZHU1,2()   

  1. 1. College of Engineering, China Agricultural University, Beijing 100083, China
    2. Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, China Agricultural University, Beijing 100083, China
    3. Faculty of Agriculture, Kyushu University, Fukuoka 8120025, Japan
  • Received:2018-03-29 Online:2019-07-01 Published:2019-07-16
  • Contact: Zhong?xiang ZHU E-mail:qinjh@cau.edu.cn;zhuzhonxiang@cau.edu.cn

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Abstract:

Wheeled farm tractors are widely used in farming and accidents involving tractor rollover remain an ongoing problem. Investigating the significance variation of factorial effects on tractor stability on various terrains provides a theoretical reference for designing tractors with higher stability and provides operators criteria for avoiding rollover. In this paper, adopting the scale?model?based experimental approach, we simulated the progress that the tractor running along the side slope in random road surfaces. In order to interpret the rollover trend, we developed an evaluation index, called the load loss rate (LLR), which characterizes the strength of contact between the ground and tractor uphill wheels. The results showed that the reasonable increase in the front weight has a significant effect on improving the tractor stability in all kinds of road conditions. However, for medium uneven road surfaces such as farmland and rotary farm, the large diameter and low?pressure tire and the wide rear wheelbase will be more effective. Meanwhile, the optimization of the tractor configuration has been significantly impaired in higher uneven terrain such as plowed fields. In addition, the interaction of the configurational factors has no significant effect on the overall machine stability under all road conditions. The results of this paper may provide a theoretical reference for the targeted optimization of tractor configuration, which can help to improve the stability of tractors in complex road conditions.

Key words: agricultural engineering, tractor stability, significance variation, optimal configuration, Taguchi experiment

CLC Number: 

  • S219.1

Table 1

PSD fitting parameters of different road"

地形（路况） W Gq (n 0)/(10-6m3)
a：压实的沙路 2.51 50
b：未铺砌的农场 2.4 256
c：草地 2.3 1744
d：农场道路 1.74 48
e：农田 1.31 248
f：旋耕场 1.076 420.9
g：犁过的农田 0.618 1069.9

Fig.1

Classification of road roughness for tractor operations"

Fig.2

Scaled random road surfaces for all classes"

Fig.3

Circuit design and data acquisition system"

Fig.4

Tractor experimental platform?including scaled random road surfaces"

Table 2

Signal factors and levels"

水平 A B C
1 36M 0 0
2 50L 10% 30%
3 50H 20% 60%

Table 3

Characteristics of tractor front tires"

前轮轮胎类型 直径/mm 刚度/(N·m-1)
36M 36 298（中级刚度）
50L 50 152（低级刚度）
50H 50 652（高级刚度）

Table 4

Taguchi experimental program"

序号 A B (A×B)1 (A×B)2 C (A×C)1 (A×C)2 (B×C)1 (B×C)2
1 1 1 1 1 1 1 1 1 1
2 1 1 1 1 2 2 2 2 2
- - - - - - - - - -
- - - - - - - - - -
27 3 3 2 1 3 2 1 2 1

Fig.5

"

Fig.6

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Fig.7

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Fig.8

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Fig.9

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