Influences of the uneven contact pressure and the initial temperature on the hot judder behavior in a multi-disc clutch

Yu, Liang; Ma, Bin; Kim, Il Yong; Li, Heyan

doi:10.1177/1350650119869450

Cited by 8 publications

(5 citation statements)

References 34 publications

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“…Refs. [6,7,8,9] established a 4-DOF model for a driveline, analyzed the mechanism and influencing factors of clutch friction judder in detail, and gave the corresponding improvement measures. Yang et al [8] also added that the resistance torque excitation had the same effect on the friction judder as the pressure fluctuation.…”

Section: Introductionmentioning

confidence: 99%

Study of the Judder Characteristics of Friction Material for an Automobile Clutch and Test Verification

Yan

Lei³

et al. 2023

Chin. J. Mech. Eng.

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The friction judder characteristics during clutch engagement have a significant influence on the NVH of a driveline. In this research, the judder characteristics of automobile clutch friction materials and experimental verification are studied. First, considering the stick-slip phenomenon in the clutch engagement process, a detailed 9-degrees-of-freedom (DOF) model including the body, each cylinder of the engine, clutch and friction lining, torsional damper, transmission and other driveline parts is established, and the calculation formula of friction torque in the clutch engagement process is determined. Second, the influence of the friction gradient characteristics on the amplification or attenuation of the automobile friction judder is analyzed, and the corresponding stability analysis and the numerical simulation of different friction gradient values are carried out with MATLAB/Simulink software. Finally, judder bench test equipment and a corresponding damping test program are developed, and the relationship between the friction coefficient gradient characteristics and the system damping is analyzed. After a large number of tests, the evaluation basis of the test is determined. The research results show that the friction lining with negative gradient characteristics of the friction coefficient will have a judder signal. When the friction gradient value is less than −0.005 s/m, the judder signal of the measured clutch cannot be completely attenuated, and the judder phenomenon occurs. When the friction gradient is greater than − 0.005 s/m, the judder signal can be significantly suppressed and the system connection tends to be stable.

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Section: Introductionmentioning

confidence: 99%

Study of the Judder Characteristics of Friction Material for an Automobile Clutch and Test Verification

Yan

Lei³

et al. 2023

Chin. J. Mech. Eng.

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“…Fan et al 11 proposed a model in which the longitudinal motion of the vehicle body was coupled with torsional vibrations of the driveline in order to study the unwanted longitudinal vibrations caused by a clutch judder. Yu et al 12 studied the influences of uneven contact pressure and initial temperature on clutch judder. More complicated and detailed friction models have been recently applied to study the behavior of a dry clutch, although they do not provide significantly different results.…”

Section: Introductionmentioning

confidence: 99%

Effects of vehicle driveline parameters and clutch judder on gearbox vibrations

Hajnayeb

Fernando

Sun

2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Clutch judder causes discomfort in a car. This undesirable event not only creates noise and vibrations, it also disturbs the normal functionality of other components in the driveline, especially the gearbox, which is prone to oscillating inputs. Although there are numerous separate studies on clutch judder and gearbox vibrations, a combined study is necessary in order to investigate the coupled dynamics, especially the effect of vibrations in a clutch on gearbox vibrations. In this paper, a dynamic model is presented for the driveline, including the details of a gearbox and a dry clutch. It allows us to investigate the effect of clutch parameters and to simulate conditions with and without judder. The obtained dynamical equations are then solved numerically. The influence of judder on gear dynamics and passenger comfort is investigated. The results show that judder causes loss of contact in the gearbox in most cases. In more severe cases of judder, it can cause rattle not only in the unloaded gear, but also in the loaded gears. A modal analysis and a frequency spectrum analysis are conducted as well in order to identify the frequency components of the system vibrations and to verify the obtained results. Parts of the results are compared with the theoretical and experimental data from other research studies, which show agreement and serve to validate the model in this work.

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“…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. In order to compensate this defect, this paper establishes a nonlinear numerical friction model based on the Gaussian friction model, which includes both the stribeck effect in slip and the friction torque characteristics in stick.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al 23 analyzed the influence of friction materials on clutch judder through the comparative analysis of 18 kinds of frictional lining specimens. Yu et al 24 analyzed the effects of the uneven contact pressure and the initial temperature of the clutch on judder behavior. The results demonstrated that the uneven contact pressure has a slight influence on clutch judder, and that the increase of initial temperature can worsen the clutch judder.…”

Section: Introductionmentioning

confidence: 99%

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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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Influences of the uneven contact pressure and the initial temperature on the hot judder behavior in a multi-disc clutch

Cited by 8 publications

References 34 publications

Study of the Judder Characteristics of Friction Material for an Automobile Clutch and Test Verification

Study of the Judder Characteristics of Friction Material for an Automobile Clutch and Test Verification

Effects of vehicle driveline parameters and clutch judder on gearbox vibrations

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

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