Main Content

Rotational Spring

Ideal spring in mechanical rotational systems

  • Rotational Spring block

Libraries:
Simscape / Foundation Library / Mechanical / Rotational Elements

Description

The Rotational Spring block represents an ideal mechanical rotational linear spring, described with the following equations:

T=K·φ

φ=φinit+φRφC

ω=dφdt

where

  • T is torque transmitted through the spring.

  • K is spring rate.

  • φ is relative displacement angle, that is, spring deformation.

  • φinit is spring preliminary winding.

  • φR and φC are absolute angular displacements of ports R and C, respectively.

  • ω is relative angular velocity.

  • t is time.

The block positive direction is from port R to port C. This means that if the port R velocity is greater than that of port C, the block transmits torque from R to C.

Variables

To set the priority and initial target values for the block variables prior to simulation, use the Initial Targets section in the block dialog box or Property Inspector. For more information, see Set Priority and Initial Target for Block Variables.

Nominal values provide a way to specify the expected magnitude of a variable in a model. Using system scaling based on nominal values increases the simulation robustness. Nominal values can come from different sources, one of which is the Nominal Values section in the block dialog box or Property Inspector. For more information, see Modify Nominal Values for a Block Variable.

Ports

Conserving

expand all

Mechanical rotational conserving port associated with the rod, that is, the moving body.

Mechanical rotational conserving port associated with the case, that is, the stationary body.

Parameters

expand all

Spring rate.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2007a