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Prismatic

Joint allowing one translational degree of freedom along a given axis

 

Description

Connections

Parameters

See Also

Description

A prismatic joint, sometimes called a slider or translational joint, is shown in the diagram below with the two bodies that it connects. A prismatic joint allows a single relative translation of the two connected frames; this joint prevents all of the other relative motions of the two frames. In the diagram below, the joint displacement, s, represents the relative translation of the end frame, x2y2z2, with respect to the start frame, x1y1z1. In this example, both x1 and x2 remain parallel to the joint axis during the motion of the two bodies.

 

The following figure shows how the prismatic joint is represented in the 3-D Workspace and the 3-D Playback Window.

 

Connections

Name

Description

framea

Joint inboard frame

frameb

Joint outboard frame

flangea

Inertial reference frame for 1-D translational components

flangeb

Translation of joint. Connects to 1-D translational components

Parameters

Symbol

Default

Units

Description

Modelica ID

e^1

1,0,0

-

Axis along which the joint allows translational motion, expressed in the inboard frame

TranAxis

Ks

0

Nm

Spring constant

Kspring

L0

0

m

Unstretched length of the translational spring

L0

Kⅆ

0

Nsm

Damping constant

Kdamper

ICs,v

Ignore

-

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

MechTranTree

s0

0

m

Initial displacement of the joint at the start of the simulation, expressed along the e^1axis

InitPos

v0

0

ms

Initial velocity of the joint at the start of the simulation, expressed along the e^1axis

InitVel

See Also

Joints and Motions

Multibody Overview