Definition of acyclism
Instantaneous angular speed fluctuations of thermal engines - Forces, torques and moments acting on single-cylinder engines
Article REF: BM2588 V1
Definition of acyclism
Instantaneous angular speed fluctuations of thermal engines - Forces, torques and moments acting on single-cylinder engines

Authors : Elian BARON, Jean-Louis LIGIER

Publication date: March 10, 2019, Review date: June 29, 2023 | Lire en français

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1. Definition of acyclism

The acyclism of an internal combustion engine is characterised by time variations in movement, speed or angular acceleration of its crankshaft , due to the forces being applied to piston-connecting rod-crank systems.

  • Three characteristics

    Depending on the circumstances, acyclism is quantified according to one of these three characteristics.

  • Variations in angular positions

    Which may make it possible to estimate the deformations and constraints imposed on a part stressed by the acyclisms of the crankshaft.

    In addition, it may be necessary to consider angular displacements...

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