Rotational Inerter
Inertia in mechanical rotational systems.
blockType: AcausalFoundation.Mechanical.Rotational.Elements.Inerter
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Description
Block Rotational Inerter It is a device that emits a torque proportional to the rate of change in relative angular velocity (angular acceleration) between ports. In fact, this is an inertia unit that operates on the speed difference between ports, rather than on absolute speed.
This unit can be used in models of highly efficient suspension systems or in simulating a passively tuned reaction of the mass-spring-shock absorber type.
The block is described by the following equations:
where
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— the torque transmitted through the unit;
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— the moment of inertia of rotation;
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— relative angular velocity;
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— absolute angular velocities at ports R and C, respectively.
The positive direction of the block is from port R to port C. This means that the torque is positive if it acts in the direction from R to C.
Variables
Use the parameter group Initial Targets to set the priority and initial target values for the block parameter variables before modeling. For more information, see Configuring physical blocks using target values.
Ports
Conserving
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R
—
shaft
rotational mechanics
Details
A mechanical rotation port connected to a shaft, that is, to a moving body.
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C
—
body
rotational mechanics
Details
A mechanical rotation port connected to the body, that is, to a stationary body.
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Parameters
Parameters
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Rotational inertance —
moment of inertia
kg*m^2 | g*m^2 | kg*cm^2 | g*cm^2 | lbm*in^2 | lbm*ft^2 | slug*in^2 | slug*ft^2
Details
The coefficient of proportionality between the torque and the rate of change of the relative angular velocity.
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| Evaluatable |
Yes |