Bushings

Bushings are typically used to reduce vibration and noise, absorb shock, and accommodate misalignments.

Depending on the requirements you can add any number of bushings to the Bushing components.

Bushing Properties

The Bushing component is required to define the options in the Bushing Properties section:
Type of Bushing
Defines the type of bushing; either Linear or AutoBush.
Translational Stiffness Properties/Rotational Stiffness Properties
These define the diagonal entries for a 6x6 stiffness matrix that is used to calculate the spring force. All stiffness values must be non-negative, Kij > 0. Rotational stiffness values are represented as Ktx, Kty and Ktz.
Translational Damping Properties/Rotational Damping Properties
These define the diagonal entries for a 6x6 damping matrix that is used to calculate the damping force. All damping values must be non-negative, Cij > 0. Rotational damping values are represented as Ctx, Cty and Ctz.
Figure 1.


Linear Bushing

When the Linear option is selected from the Type of Bushing drop-down menu, the following options are displayed:
Translational Preload Properties/Rotational Preload Properties
Defines the initial translational (Fx, Fy, Fz) and rotational (Tx, Ty, Tz) preloads.
Figure 2. Linear Bushing Properties


AutoBush Bushing

When the AutoBush option is selected from the Type of Bushing drop-down menu, the following options are displayed:
Bushing Property File
Use this option to browse and use an existing Bushing property file.
Figure 3. AutoBush Options


Bushing Properties for Leaf Property File (*lpf)

In the Bushing block of Leaf Property file, the attribute, type, and valid value that has to be entered in TiemOrbit file format are detailed in the following table. This table also provides information about the mandatory requirements for attributes.
An example of how an Bushing block is represented in a TiemOrbit file format is shown below:
$---------------------------------------BUSHING
[BUSHING]
(BUSHING)
FORCEPRELOAD = [0.0, 0.0, 0.0]
ROTDAMP = [5000.0, 5000.0, 500.0]
ROTSTIFF = [500000.0, 500000.0, 5000.0]
TORPRELOAD = [0.0, 0.0, 0.0]
TRANSDAMP = [50.0, 50.0, 25.0]
TRANSSTIFF = [10000.0, 10000.0, 5000.0]
Block Name = ‘Bushing’ (Required)
Sub-block Name = ‘Rubber Bushings’
Attributes Type Valid Value Required
Type of Bushing String ‘Linear’

‘AutoBush’

 Yes
Translational Stiffness Properties

Kx, Ky, Kz

 Real - Yes
Rotational Stiffness Properties

Ktx, Kty, Ktz

 Real - Yes
Translational Damping Properties

Cx, Cy, Cz

 Real - Yes
Rotational Damping Properties

Ctx, Cty, Ctz

 Real - Yes
Translational preloads Fx, Fy, Fz Real - Yes
Rotational preloads Fx, Fy, Fz Real - Yes