Variable Rotational Damper
Rotational motion damper with variable damping coefficient.
Description
The Variable Rotational Damper block is a viscous rotational damper with a variable damping factor. The value of the variable damping coefficient is input to input port B. The magnitude of the damping torque is equal to the product of the value at port B and the relative angular velocity between the two non-directional rotation ports R and C. The minimum value of the damping ratio prevents non-physical negative values of the damping ratios.
The damping torque satisfies the following expression:
where
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- torque transmitted through the damper;
-
- viscous damping coefficient;
-
- minimum permissible damping coefficient;
-
- is the relative angular velocity measured between two non-directional ports of rotation as follows: ;
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- the angular velocity of the non-directional port of rotation R;
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- angular velocity of the non-directional port of rotation C.
The unit applies equal opposite damping torques to the non-directional rotation ports. The sign of the damping torque acting on the R port is equal to the sign of the relative angular velocity. A positive relative angular velocity corresponds to a positive damping torque acting on the R port and a negative damping torque of the same magnitude acting on the C port.
Ports
Conserving
#
R
—
slave rotation port
`rotational mechanics
Details
A non-directional port of rotation associated with a slave element.
| Program usage name |
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#
C
—
basic rotation port
`rotational mechanics
Details
A non-directional port of rotation associated with the base element.
| Program usage name |
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Input
#
B
—
variable damping factor
scalar
Details
Variable damping factor.
| Data types |
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| Complex numbers support |
No |
Parameters
Parameters
#
Minimum damping coefficient —
minimum damping factor
N*m/(rad/s) | ft*lbf/(rad/s)
Details
The minimum permissible damping factor. If the value on port B is less than this value, it is equated to it. The value of this parameter must be greater than or equal to zero.
| Units |
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| Default value |
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| Program usage name |
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| Evaluatable |
Yes |