Free Motion - MapleSim Help
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Free Motion

Joint allowing three translational and three rotational degrees of freedom

 

Description

Connections

Parameters

See Also

Description

A free joint, sometimes called a 6-DOF joint or motion sensor, is shown in the diagram below with two reference frames at either end of the connection: on body 1, and on body 2.  The free joint places no restrictions on the relative motion of the two frames, but simply provides a means for measuring the relative translations and rotations. The translation of the end frame, relative to the start frame, is represented by the vector, r , which is resolved into its three components in the  frame. The rotation of relative to , is represented by three Euler angles.

Connections

Name

Description

Joint inboard frame

Joint outboard frame

Parameters

Symbol

Default

Units

Description

Modelica ID

 

Indicates whether the initial velocity is expressed in the inboard or outboard frame

VelType

 

Indicates the sequence of body-fixed rotations used to describe the initial orientation of the joint.  For example,  refers to sequential rotations about the x, then y, then z axis (123 - Euler angles)

RotType

 

Indicates whether the initial angular velocity is expressed in the inboard or outboard frame. If Euler is selected, the initial angular velocities are assumed to be the direct derivatives of the Euler angles.

AngVelType

Ignore

 

Indicates whether MapleSim ignores, tries to enforce, or strictly enforces the translational initial conditions

MechTranTree

Initial displacement of the joint at the start of the simulation, expressed along the x-, y-, and z-axis of the inboard frame respectively

InitPos

Initial velocity of the joint at the start of the simulation, expressed along the x-, y-, and z-axis of the inboard frame respectively

InitVel

Ignore

 

Indicates whether MapleSim ignores, tries to enforce, or strictly enforces the rotational initial conditions

MechRotTree

Initial rotation of the joint at the start of the simulation, based on the  parameter value

InitAng

Initial angular velocity of the joint at the start of the simulation, based on the  parameter value

InitAngVel

See Also

Joints and Motions

Multibody Overview

 

 

 

 

 


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