Constant and Load-Dependent Gear Efficiencies

Here, you revisit the sdl_transmission_2spd model in Model a Two-Speed Transmission with Braking. You reconfigure the Simple Gears to model power loss due to nonideal meshing. The effect of viscous bearing losses is ignored.

  1. Open the sdl_transmission_2spd model and simulate to check the ideal gear behavior.

  2. Open the Gear High and the Gear Low blocks. Under Meshing Losses, in the Friction model drop-down list, choose Constant efficiency for both. Enter efficiencies less than 1, but greater than 0. For example, for the Gear Low block, enter 0.7; and for the Gear High block, enter 0.95.

  3. Leave the other settings as they are, including zero viscosity. Close the blocks.

  4. Restart the model. The driveline runs at a lower efficiency and slightly smaller angular velocities, because of the power losses. If you enter different efficiency factors for the two gears, the effect of the loss is different if you switch between gears.

Experiment with load-dependent efficiency. In the Friction model drop-down menu, choose Load-dependent efficiency instead. In that case, you need more efficiency model details to specify.

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