Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (1): 44-52.doi: 10.13229/j.cnki.jdxbgxb20181239

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Modeling and tests for torsional characteristics of multi-stage stiffness dual mass flywheel torsional dampers

Wen-ku SHI1(),Long CHEN1,Gui-hui ZHANG2,Zhi-yong CHEN1()   

  1. 1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
    2. Dahua Machine Manufacturing Co. Ltd. , Changchun 130103, China
  • Received:2018-09-26 Online:2020-01-01 Published:2020-02-06
  • Contact: Zhi-yong CHEN E-mail:shiwk@jlu.edu.cn;chen_zy@jlu.edu.cn

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Abstract:

The torsional characteristics modeling and piecewise point smooth fit of multi-stage stiffness Dual Mass Flywheel (DMF) are studied. Firstly, based on the analysis of the working principle of multi-stage stiffness DMF, a mathematical model of the torsional characteristics of the DMF with piecewise stiffness and damping nonlinearity is established, and the accuracy of the model is verified through bench test. Secondly, to solve the problems of jump discontinuities in the model, and the errors that may occur during the simulation process, the inverse tangent function is used to smoothly fit the model, and the nonlinear model of the DMF based on the arctangent fitting function is obtained. Finally, the models before and after smooth fitting are compared and analyzed. The results show that the smooth fitting of the arctangent function has little effect on the accuracy of the model, which can make the model piecewise point and the critical point smoothly transition, and improve the model simulation stability.

Key words: vehicle engineering, multi-stage stiffness, dual mass flywheel (DMF), nonlinear torsional characteristics modeling, arctangent function, bench test

CLC Number: 

  • U461.1

Fig.1

Arc spring DMF structure"

Fig.2

Two?stage torsional stiffness arc spring structure"

Fig.3

Torsional stiffness characteristic curve"

Fig.4

Arc spring friction diagram"

Fig.5

Arc spring structure"

Fig.6

Element force diagram"

Fig.7

Relationship between friction torque and torsional angel"

Fig.8

Fitting curves"

Table 1

DMF design parameters"

变量 设计值 试验值
一级刚度/[N?m?(°)-1] 3.5 3.2
二级刚度/ [N?m?(°)-1] 12 11
间隙转角/(°) 10 9
基础阻尼/[N?m?s?(°)-1] 12 12.27
一级刚度扭转角度/(°) 44.5 44.5
最大转角/(°) 60 59.61

Fig.9

DMF test bench"

Fig.10

DMF torsion characteristic curve"

Fig.11

Comparisons between fitted and experimentalvalue of torsion characteristic"

Fig.12

Model error"

Fig.13

Comparison curve between original and fitting function"

Fig.14

Point A partial enlargement"

Fig.15

Fitting error"

Fig.16

Speed curve of fitting function"

Fig.17

Acceleration curve of fitting function"

Fig.18

Comparison curve between original and fitting model"

Fig.19

Model fitting error"

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