2nd ICAI 2022

International Conference on Automotive Industry 2022

Mladá Boleslav, Czech Republic

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State before clutch engagement State after clutch engagement

[kg . m 2 . s -1 ]

Angular momentum

[J]

Energy

Figure 3: Schematic representation of connection of rotating masses by a coupling

Determination of the work lost by the clutch is based on the law of conservation of angular momentum and the law of conservation of energy. The law of conservation of angular momentum states that the angular momentum of an isolated system of bodies is conserved. Then the following is valid:

The law of conservation of energy states that energy can neither be created nor destroyed; rather, it can only be transformed from one form to another. The energy of the clutch before engagement is equal to:

The decrease of kinetic energy after connecting both bodies is given by an irreversible increase of internal energy. In this case it is thermal energy. It is an inelastic impact. In an ideal inelastic impact the two bodies have the same velocity after collision (they do not move with respect to each other). The energy of the system after clutch engagement and stabilizing rotational speed is equal to:

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