Study of Clutch Judder Phenomenon in Manual Transmission Vehicle and Its Analysis Approach

Friction-induced parametric oscillations in automotive drivelines: experimental analysis and modelling

“…To the best of the authors' knowledge, the current scientific literature on the subject identifies three main factors responsible for clutch judder. In several cases, it is attributed to a negative gradient of the coefficient of friction between the clutch plates (in this case referred to as cold judder) [1][2][3][4][5][6][7]. In fact, if the friction coefficient decreases with increasing slip speed, the system becomes unstable in most operating conditions.…”

“…In fact, if the friction coefficient decreases with increasing slip speed, the system becomes unstable in most operating conditions. The second identified factor is stick-slip [7][8][9][10][11], associated with the alternate sticking and slipping motion which occurs due to the discontinuity of the friction curve at very low relative speeds. Finally, the third factor is given by geometric disturbances in terms of both asperity on the disc surfaces and misalignments between the components of the transmission.…”

Cooperative effects of control parameters on the dynamic responses of vehicle powertrain during start-up process

“…And single-factor analysis method were used to analyze the influence of internal and external excitations, for example,engine torque, clamp force, and structure parameter of system on the dynamic responses of vehicle powertrains when the clutch engages. 11,12,14,16 Although the dynamic responses of the vehicle powertrain during start-up process are affected by external excitations, it is mainly affected by the friction characteristics of clutch, which degrade with repeated engagements throughout full service life. 22,23 To better control the start-up process, an analysis of the effect of a single controllable parameter on the dynamic characteristics of the driveline is not sufficient, nor is an analysis of the cooperative effect of the controllable parameters with fixed values and robust control with a constant friction coefficient, 24 since the friction characteristics of clutch vary with service life, and optimum control operation should be dictated by the friction characteristics of clutch.…”

“…Gkinis et al 10 tested the friction coefficients of new and old clutches, and studied the vibration of powertrain with the new and old clutches, respectively, they found that the old clutch exhibits different frictional behavior with new one, and the state of clutch friction lining material has effect on the vibration in the powertrain. Mohire et al 11 studied the FIV of a vehicle equipped with a MT, and analyzed the effect of the pedal force on the vibration. Paygude and Rohit Ravindra 12 studied the FIV of a commercial vehicle.…”

“…And single-factor analysis method were used to analyze the influence of internal and external excitations, for example,engine torque, clamp force, and structure parameter of system on the dynamic responses of vehicle powertrains when the clutch engages. 11,12,14,16…”