Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (1): 36-51.doi: 10.13229/j.cnki.jdxbgxb.20230334

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Matching analysis and experimental verification of heavy-duty vehicle torsional shock absorbers

Kai-feng WANG1,2(),Xing-yu MA2,Jia-xing ZHU2,Xiang-yang XU1(),Hao-cheng FENG2,Yu-long LEI3   

  1. 1.School of Transportation Science and Engineering，Beihang University，Beijing 100191，China
    2.Automotive Transmission Engineering Research Institute，Shaanxi Fast Gear Co. ，Ltd. ，Xi'an 710119，China
    3.College of Automotive Engineering，Jilin University，Changchun 130022，China
  • Received:2023-04-10 Online:2025-01-01 Published:2025-03-28
  • Contact: Xiang-yang XU E-mail:wangkaifeng@fastgroup.com;xxy@buaa.edu.cn

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Abstract:

In order to study the matching application characteristics of the shock absorber integrated in the AT （Automatic transmission） on the large-tonnage intelligent transportation equipment，the parameters of no-load，half-load and full-load heavy-duty vehicles and the adaptive engine were taken as the input， a complete vehicle transmission system model was established based on AMESim simulation platform. The influence of different damper torsional characteristic parameters at different transmission gears on the matching characteristics of the vehicle transmission system was analyzed in the fixed throttle opening and the accuracy of the simulation model was verified through a torsional vibration experimental platform.The results show that the vehicle weight has a significant impact on the matching characteristics of the shock absorber and the whole vehicle，and the equivalent stiffness safety region value of the shock absorber corresponding to different vehicle weights is different； The effect of the shock absorber at different gears is significantly different. When the shock absorber is at high gear，it is easier to amplify the resonance amplitude of the input speed； The second level torsional stiffness shock absorber can improve the speed fluctuation at the input end of the transmission in harsh working conditions，the first level torsional stiffness has a greater beneficial impact on torsional vibration compared to the second level torsional stiffness，the minimum damping moment was determined by analyzing the torsional vibration results under different damping moments.

Key words: torsional vibration damper, equivalent stiffness, torsional characteristic, resonance, torsional vibration matching

CLC Number: 

  • U463.2

Fig.1

AT installation environment diagram of shock absorber"

Fig.2

AT breakdown structure diagram of shock absorber"

Fig.3

Strong harmonic （left） and main harmonic （right） excitation torque phase diagram"

Fig.4

Torsional shock absorber and it's simplified model"

Fig.5

Torsional vibration model of transmission system under idle operating condition"

Fig.6

Torsional vibration model of transmission system under acceleration condition"

Fig.7

Structural diagram of vehicle transmission system"

Fig.8

AMEsim simulation model of vehicle transmission system"

Fig.9

Discrete simplified model of diesel engine crankshaft system"

Table 1

Crankshaft discretization parameters"

惯量/（kg·m2）数值刚度/107（N·m·rad-1）数值
I10.276K13.495
I20.059K27.447
I30.225K31.102
I40.088K41.116
I50.177K51.091
I60.089K61.093
I70.227K71.124
I80.115K81.117
I90.279K91.117
I100.089K101.124
I110.177K111.093
I120.088K121.092
I130.222K131.116
I140.059K147.447
I150.016K155.344
I164.465——

Table 2

Basic information of whole vehicle and transmission"

信息及编号参数数值
整车1长×宽×高/m×m×m11.5×4.5×4.6
2迎风面高/m4.5
3迎风面宽/m4
4满载重量/t150
5轮胎半径/m0.97
6驱动形式6×4
7风阻系数0.65
8滚动阻力系数0.025
9路面附着系数0.7
10主减速比22

变速

器

11最大输入扭矩/（N·m）3 500
12最大输入转速/（r·min-1）2 500
13前进挡位数9
14离合器数6
15行星排数4

Fig.10

Single cylinder pressure curve"

Fig.11

Comparison between simulated and actual values of vehicle speeds in different gears"

Table 3

Comparison table of simulation analysis conditions"

挡位等效刚度/［N·m·（°）-1］车重/t

2~9

350100（空载）
500100（空载）
650100（空载）
2~9350120（半载）
500120（半载）
650120（半载）
2~9350140（满载）
500140（满载）
650140（满载）

Fig.12

Comparison of speed filtering for various gear fluctuations"

Fig.13

Natural frequency of transmission input under different equivalent stiffness"

Table 4

Solution of critical speed with different equivalent stiffness"

等效刚度

/［N·m·（°）-1］

频率

/Hz

谐次
0.511.522.533.544.55
35070.98 5204 2602 8402 1301 7041 4181 2171 065946852
50074.18 8804 4402 9602 2201 7761 4821 2681 110986888
65077.29 3604 6803 1202 3401 8721 5441 3371 1701 040936

Fig.14

Torsional vibration patterns of shock absorbers with different equivalent stiffness"

Fig.15

Torsional vibration patterns under different vehicle load conditions"

Fig.16

Ideal torsion characteristic curve of the second level with different slopes"

Fig.17

Ideal torsion characteristic curve of the first level with different slopes"

Table 5

Six different secondary linear torsional stiffness characteristic parameters"

扭转行程角/（°）扭矩/（N·m）
第1种第2种第3种第4种第5种第6种
-12-4 200-4 200-4 200-4 200-4 200-4 200
-10（第1、4种）/-9（第2、5种）/-8（第3、6种）-2 600-2 322-2 064-2 580-1800-1 000
0000000
10（第1、4种）/9（第2、5种）/8（第3、6种）2 6002 3402 0802 58018001 000
124 2004 2004 2004 2004 2004 200

Fig.18

Matching calculation results of six different secondary linear torsional stiffness shock absorbers"

Fig.19

Influence of damping torque"

Fig.20

Torsional vibration reduction test bench"

Fig.21

Comparison of torsional shock absorber test and simulation data"

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