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