2nd ICAI 2022

International Conference on Automotive Industry 2022

Mladá Boleslav, Czech Republic

The plot of the angular velocities in the Figure 7 shows the time of full clutch engagement that occurs in . Also it show the plot of actuating force which is dependent on the air-pressure in the actuating cylinder. Until that time the friction discs are either not in contact or their surfaces are slipping relatively to each other.

Figure 8: Plot of kinetic energy versus time

The difference of the system energy before and after clutch engagement is energy loss and is shown Figure 8. The kinetic energy dissipates into thermal energy.

3. Summary of the results In the following Table 2 there are resulting values of energy losses obtained by all calculation approaches. The final values of empiric approach and analytic approach calculation are quite similar. The analytically calculated energy loss is the lowest physically possible. The result of a MBD simulation includes additional energy loss caused by slippage.

Table 2: Results of energy loss calculations Energy lost in clutch engagement Empiric approach 100 kJ Analytic approach 95.94 kJ Simulation approach 143.12 kJ

4. Conclusion From the results of empirical and analytical calculations, it is apparent that these describe ideal case which cannot occur in real machine. It is the lowest possible energy loss. In real machine, in real clutch, there is a slippage of all friction elements for a certain amount of time. This slippage is dependent on the construction design of the

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