Analysis of forces and torques due to gas combustion
Instantaneous speed fluctuations of thermal engines. Excitations applied to the crankshaft

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Analysis of forces and torques due to gas combustion


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

Authors : Jean-Louis LIGIER, Elian BARON

Publication date: September 10, 2021 | Lire en français

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6. Analysis of forces and torques due to gas combustion

As with the analysis of the inertial terms contributing to the crankshaft excitation torque, it is useful to detail the torque due to gas thrust, in order to distinguish its various components and simplification possibilities. To do this, we first recall :

  • what is the expression for the "gas" torque of a single-cylinder engine?

  • What is the expression for the "gas" torque of a 4-cylinder engine?

  • What are the characteristics of gas pressure harmonics?

  • what are the simplified expressions of the gas pairs.

6.1 Harmonic expression of single-cylinder gas torque

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