Engee documentation

Rotational Spring

An ideal spring in mechanical rotary systems.

blockType: AcausalFoundation.Mechanical.Rotational.Elements.Spring

rotational spring

Path in the library:

/Physical Modeling/Fundamental/Mechanical/Rotational/Elements/Rotational Spring

Description

Block Rotational Spring It is an ideal mechanical rotary spring described by the following equations:





where

  • — the torque transmitted through the spring;

  • — coefficient of elasticity;

  • — relative displacement (spring deformation);

  • — initial position (spring displacement);

  • — the absolute angular positions of ports R and C, respectively;

  • — relative angular velocity;

  • — the time.

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

# R — shaft
rotational mechanics

Details

A mechanical rotation port corresponding to a shaft, that is, a moving body.

Program usage name

rod_flange

# C — body
rotational mechanics

Details

A mechanical rotation port corresponding to the body, that is, a stationary body.

Program usage name

case_flange

Parameters

Parameters

# Spring rate — coefficient of elasticity
N*m/rad | mN*m/rad | kN*m/rad | kgf*m/rad | lbf*ft/rad | N*m/deg | mN*m/deg | kN*m/deg | kgf*m/deg | lbf*ft/deg | W*s/rad | HP_DIN/rpm | HP_DIN*s/rad

Details

Coefficient of elasticity.

Units

N*m/rad | mN*m/rad | kN*m/rad | kgf*m/rad | lbf*ft/rad | N*m/deg | mN*m/deg | kN*m/deg | kgf*m/deg | lbf*ft/deg | W*s/rad | HP_DIN/rpm | HP_DIN*s/rad
Default value

10.0 N*m/rad
Program usage name

k
Evaluatable

Yes

Examples