Mechanism of Shudder Phenomena in Torque Converter and System Simulation Model

Ogawa, Hideki; Hayashi, Eiji; Yoshida, Osamu; Hayakawa, Yoichi; Kuroyanagi, Takamitsu; Ishikawa, Kinzô; Takabayashi, Hideaki; Maruo, Kenji; Fujii, Tamotsu

doi:10.4271/2007-01-0243

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…where k is the axial stiffness of waveform cushions, v is the clutch engagement speed. The shear torque in equation ( 8) is obtained by equations ( 10)- (11), and expressed as:…”

Section: Dynamic Model Of Friction-induced Juddermentioning

confidence: 99%

“…When the gradient of the friction coefficient with relative speed is negative, the system's comprehensive damping effect is negative, which can easily cause the system to be unstable and then cause the self-excited judder. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Based on the conclusion, many scholars have concentrated on the influencing factors of clutch friction coefficient. Li et al 23 analyzed the influence of friction materials on clutch judder through the comparative analysis of 18 kinds of frictional lining specimens.…”

Section: Introductionmentioning

confidence: 99%

“…will affect the friction coefficient, which further affects the self-excited judder. [8][9][10][11][12][13][14][15][16][17][23][24][25][26][27][28][29][30] In addition, some scholars have also studied the influence of other parameters on the self-excited judder. Yamada and Ando 18 established an equivalent dynamic model of the lock-up clutch and its rear driveline, and mainly analyzed the influence of driveline damping on stability.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, when analyzing the judder caused by friction, most scholars use the Karnopp friction model for the friction torque analysis, 7,11,12,15,[19][20][21][22]34 but the Karnopp friction model does not include the stribeck effect and cannot accurately reflect nonlinear characteristics of the friction. The Gaussian friction model includes the stribeck effect, but it assumes that the friction torque is zero simultaneously when the relative speed is zero, 8,24 which is inconsistent with the reality.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation on friction-induced judder of vehicle driveline based on a nonlinear friction model

Chang

Xia

Pang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Due to friction characteristics of clutch, the driveline is prone to cause a judder during vehicle starting, and then to cause the vehicle body to vibrate, which affects driving quality. In order to analyze the judder phenomenon, a nonlinear numerical friction model based on the Gaussian friction model is established in this paper. For the driveline of a front-wheel-drive vehicle, a five-degree-of-freedom (5DOF) lumped parameter model including a nonlinear friction element is established. The complex mode of the driveline during the clutch in slip condition is calculated. The key parameters affecting the driveline stability are analyzed. The self-excited judder and pressure-induced judder of the driveline are numerically simulated, and the corresponding causes are analyzed. The nonlinear friction torque of the clutch is also calculated. Furthermore, the effects of the key parameters such as the torsional stiffness and damping of the clutch and drive shaft suppressing the self-excited judder and pressure-induced judder are numerically studied respectively. Compared with the widely used Karnopp friction model, the nonlinear numerical friction model established in this paper comprehensively includes the stribeck effect in slip and the friction torque characteristics in stick. The phenomena of the judder and stick-slip of the driveline during vehicle starting are more accurately simulated. The simulation results are in good agreement with the experimental results, which verify the accuracy and effectiveness of the dynamic model including the nonlinear friction element established in this paper.

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“…where k is the axial stiffness of waveform cushions, v is the clutch engagement speed. The shear torque in equation ( 8) is obtained by equations ( 10)- (11), and expressed as:…”

Section: Dynamic Model Of Friction-induced Juddermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation on friction-induced judder of vehicle driveline based on a nonlinear friction model

Chang

Xia

Pang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

Occurrence Mechanism and Suppression Method for Shudder in Automatic Transmission Powertrain

Rosbi

Ryu

Matsuzaki

et al. 2014

IJAE

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Shudder occasionally occurs in the lock-up clutch of automatic transmissions when the frictional characteristics of the lock-up clutch have a negative slope with respect to the relative slip velocity. This study evaluates the effect of a dynamic absorber on reducing shudder in an automatic transmission powertrain. The automatic transmission is modeled as a linear multi-degree-of-freedom system using Lagrange's equation of motion. The optimal dynamic absorber characteristics for suppression of shudder are calculated. The experimental results reveal the optimized dynamic absorber can completely suppress shudder. Engine forced vibration analysis shows that the dynamic absorber can reduce vibration without any detrimental effects.

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Optimum Design of Front Cover Taper Angle in Torque Converter by Finite Element Method

Choi¹,

Song²,

Kosuge³

et al. 2007

SAE Technical Paper Series

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Mechanism of Shudder Phenomena in Torque Converter and System Simulation Model

Cited by 6 publications

References 6 publications

Investigation on friction-induced judder of vehicle driveline based on a nonlinear friction model

Investigation on friction-induced judder of vehicle driveline based on a nonlinear friction model

Occurrence Mechanism and Suppression Method for Shudder in Automatic Transmission Powertrain

Optimum Design of Front Cover Taper Angle in Torque Converter by Finite Element Method

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