FORCED TORSIONAL VIBRATION OF A TWO DEGREES OF FREEDOM SYSTEM INCLUDING CLEARANCE AND FRICTION. (2ND REPORT, CASE OF STICK-SLIP MOTION).

The engine-clutch-manual transmission system of an automobile is modeled by a forced torsional vibration system of two degrees of freedom including two nonlinear terms, namely clearance and friction. In the derivation of the analytical solution, the friction term is linearized based upon the approximate solution of motion. The conclusions are as follows: 1) Experiments, computer simulations and the analytical solution show that the stick-slip motion occurs when the friction torque takes a value within certain limits. 2) When the system approaches resonance, the sum of the torque impulse becomes large in the system with small friction, but it remains almost unchanged in the system with large friction.