Glossary
Instantaneous speed fluctuations of thermal engines. Excitations applied to the crankshaft

Acyclism; instantaneous angular speed variations

Instantaneous variations in rotational speed induced by cyclic variations in the torques exerted on the engine. Acyclism depends on the number of cylinders in the engine, the time intervals between ignitions, as well as the arrangement of the cylinders, the shape of the crankshaft and the ignition sequence adopted.

Effet des gaz; gas effects

The pressure in the combustion chamber induces forces and moments that apply to the engine block and crankshaft (engine torque).

Effets des inerties ; effects of inertia

Moving parts such as pistons, connecting rods and crankshafts are accelerated or decelerated depending on the moment in the combustion cycle. These non-uniform motions create forces and moments. These "inertial"...