Engee documentation

Translational Inerter

Inertia in mechanical translational systems.

blockType: AcausalFoundation.Mechanical.Translational.Elements.Inerter

Path in the library:

/Physical Modeling/Fundamental/Mechanical/Translational/Elements/Translational Inerter

Description

Block Translational Inerter It is a device that exerts a force proportional to the rate of change in relative velocity (acceleration) between ports. Inertia is the mechanical equivalent of a capacitor. Block Translational Inerter with one port connected to the reference point, it essentially behaves like a mass whose value is equal to a given inertia.

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

  • — the force transmitted through the inertia;

  • — inertia;

  • — relative velocity;

  • — absolute speeds on ports R and C, respectively.

The positive direction of the block is from port R to port C. This means that the force is positive if it acts in the direction from R to C.

Variables

Use the Initial Targets parameter group 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

# R — mechanical port
translational mechanics

Details

Mechanical translational port.

Program usage name

rod_flange

# C — mechanical port
translational mechanics

Details

Mechanical translational port.

Program usage name

case_flange

Parameters

Parameters

# Inertance — inertia
kg | mg | g | t | lbm | oz | slug

Details

The coefficient of proportionality between the force and the rate of change of the relative velocity.

Units

kg | mg | g | t | lbm | oz | slug

Default value

1.0 kg

Program usage name

b

Evaluatable

Yes