Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (5): 1221-1226.doi: 10.13229/j.cnki.jdxbgxb.20221578

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Fault detection algorithm for indicator diagram of automobile shock absorber based on dynamic analysis

Liang-liang GUAN(),Guo-hong TIAN   

  1. Department of Automobile and Traffic Engineering，Liaoning University of Technology，Jinzhou 121001，China
  • Received:2022-12-09 Online:2024-05-01 Published:2024-06-11

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Abstract:

To alleviate the radial power deviation caused by flow inertia in automotive shock absorbers， a fault detection algorithm based on dynamic analysis of automotive shock absorber indicator diagram is proposed. Calculate the flow inertia of the shock absorber fluid in the left and right enclosed areas， substitute the radial force in the compression stroke and the radial force in the rebound stroke into the energy and momentum equations， establish the dynamic equation of the car shock absorber， draw the measured indicator diagram， and input it as a sample into the support vector machine for classification. Set the judgment threshold for threshold judgment， and complete the fault detection of the indicator diagram. The experimental results show that the proposed method's fault detection accuracy is good， as the indicator diagram of the automotive shock absorber obtained during insufficient liquid supply， double valve leakage， piston jamming， and sand resistance is basically consistent with the measured indicator diagram.

Key words: dynamic analysis, automobile shock absorber, connecting rod, indicator diagram, support vector machine

CLC Number: 

  • TH165

Fig.1

Topological structure of automobile shock absorber"

Fig.2

Ideal indicator diagram and measured indicator diagram"

Fig.3

Test object"

Table 1

Technical parameters of test object"

技术参数参数值
前交叉管外径dfo/m0.070
前交叉管内径dfi/m0.054
活塞杆外径dso/m0.062
活塞杆内径dsi/m0.067
活塞杆长度Ify/m0.147
阻尼孔直径df/m0.0083
导流孔直径dy/m0.002
空气柱初高hair/m0.600
空气柱预压高度hpre/m0.038
减震液密度ρ/（m3·s-1）1100
动力黏度μ/（N·s·m-2）0.5
油膜长度hr/m0.319
油膜厚度δ/m3×10-5
流量系数ε0.84
多变指数n2.34
大气压力P0/（N·m-2）1.702×106
径向压流pn/（N·m-2）2100
加振频率f/Hz4.088

Fig.4

Comparison of different methods"

Fig.5

Comparison of different methods"

Fig.6

Comparison of different methods"

Fig.7

Comparison of different methods"

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