WOLFRAM SYSTEM MODELER

LossyGearDemo2

Example to show combination of LossyGear and BearingFriction

Diagram

Wolfram Language

In[1]:=
SystemModel["Modelica.Mechanics.Rotational.Examples.LossyGearDemo2"]
Out[1]:=

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This model contains bearing friction and gear friction (= efficiency). If both friction models are stuck, there is no unique solution. Still a reliable Modelica simulator should be able to handle this situation.

Simulate for about 0.5 seconds. The friction elements are in all modes (forward and backward rolling, as well as stuck).

You may plot:

Inertia1.w,
Inertia2.w          : angular velocities of inertias
powerLoss           : power lost in the gear
bearingFriction.mode:  1 = forward rolling
                       0 = stuck (w=0)
                      -1 = backward rolling
gear.mode           :  1 = forward rolling
                       0 = stuck (w=0)
                      -1 = backward rolling

Note, powerLoss (= sum of the power flows of the connectors) and gear.powerLoss (= gear.tau_loss*gear.w_a, where gear.tau_loss is determined in a non-trivial way from the stuck/sliding situation of the bearing and teeth friction; = equation (16) in [Pelchen2002]) should be identical, or the difference should be close to zero, if model LossyGear is correctly implemented.

Note: This combination of LossyGear and BearingFriction is not recommended to use, as component LossyGear includes the functionality of component BearingFriction (only peak not supported).

Components (9)

gear

Type: LossyGear

Description: Gear with mesh efficiency and bearing friction (stuck/rolling possible)

Inertia1

Type: Inertia

Description: 1D-rotational component with inertia

Inertia2

Type: Inertia

Description: 1D-rotational component with inertia

torque1

Type: Torque

Description: Input signal acting as external torque on a flange

torque2

Type: Torque

Description: Input signal acting as external torque on a flange

DriveSine

Type: Sine

Description: Generate sine signal

load

Type: Ramp

Description: Generate ramp signal

bearingFriction

Type: BearingFriction

Description: Coulomb friction in bearings

fixed

Type: Fixed

Description: Flange fixed in housing at a given angle