1. Mechanical sources of permanent excitation

1.1 Connecting rod-crank system

The connecting rod exerts a cyclic force on the crankshaft crankpin, the tangential component of which gives a torque C that can be broken down into a C _p component due to the action of the pressure on the piston and a C _i component due to the quantities of acceleration of the connecting rod and piston. We have : C = C _p + C _i