How to calculate gearbox power loss?
Example: A 30 MW gearbox, the helical gear pair mounted on journal bearing. It is rotating at high speeds (greater than 120 m/s).
power losses are mesh power loss (friction and windage) and bearing power loss.
How to calculate frictional, windage and bearing power loss? What is the percentage of each loss in total gearbox power loss?
If possible, explain power loss calculation with an example (ex: 30 MW gearbox)
Please see if the following papers help:
https://www.researchgate.net/publication/271075696_Gearbox_power_loss_Part_I_Losses_in_rolling_bearings
https://www.researchgate.net/publication/271075607_Gearbox_power_loss_Part_II_Friction_losses_in_gears
https://www.researchgate.net/publication/274567061_Gearbox_power_loss_Part_III_Application_to_a_parallel_axis_and_a_planetary_gearbox
Best regards
It is a complex process and I do not think you can get a simple answer. However, in short, the total losses and the contribution of each component are function of gear design, lubricating oil and operating conditions. For instance, at very high speed and low torque, the churning losses might overcome the meshing losses and vice versa. The suggested papers above by Carlos Fernandes are really good and I always enjoy reading them.
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