Adams Car Package > Adams Driveline > Working with Components > Churning-Drag Forces

Churning-Drag Forces

Creating or Modifying Churning-Drag Forces

The churning-drag force component allows you to model the oil resistance acting on gears when they rotate in oil. A churning drag describes a force-based component that models the oil resistance that forms between gears and the gearbox case as soon as gears have a relative angular velocity with respect to the gearbox case.

Learn about churning-drag components:

■Creating or Modifying Churning-Drag Forces

■About Churning-Drag Forces

Creating or Modifying Churning-Drag Forces

To create or modify churning-drag forces:

1. From the Driveline Components menu, point to Churning Drag, and then select New/Modify.

2. Press F1 and then follow the instructions in the dialog box help for Churning-Drag Force.

3. Select OK.

About Churning-Drag Forces

Adams Driveline calculates the resistance force using a rotational single-component force and its expression is as follows:

SIGN(K * Viscosity * B * Diam2 * ABS(wz)1.5, -wz)

where:

■K = Constant (default 3.0E-12)

■B = Gear breadth

■Diam = Diameter

■wz = Angular velocity

In the Standard Interface (see Interface Modes), you can vary values for the following:

■Constant

■Breadth

■Viscosity

■Diameter

Component:	Component name:	Component units:	Definition:
F2	angular displacement	angle	The angle between the two parts.
F3	angular_velocity	angular velocity	The relative velocity between the two parts connected with the churning drag component.
F4	torque	torque	Rotational force exerted by the churning drag component.