Ptsf

Model Element

Class Name

Ptsf

Description

PTSF defines a higher pair constraint. A fixed point on one body slides on a surface that is fixed on a second body. The point is not allowed to lift off the surface.

Attribute Summary

Name	Property	Modifiable by command?
id	Int ()
label	Str ()	✓
surface	Reference ("Surface")	✓
i	Reference ("Marker")	✓
rm	Reference (“Marker”)	✓
disp	Double ([0,0,0], count=3)
active	Bool ()	✓

Usage

Ptsf (i=objMarker, surface=objSurface, optional_attributes)

Attribute Description

Reference to an existing Marker

Defines the marker whose origin is the point that is restricted to move on a surface

The attribute i is mandatory.

surface

Reference to an existing surface

Defines the surface to be used in this constraint

The attribute surface is mandatory.

Reference to an existing Marker

Specifies a fixed marker that defines the coordinate system in which the surface points are defined. It also implicitly defines the body on which the surface is "etched". The surface moves with the body.

The attribute rm is mandatory.

Integer

Specifies the element identification number. This number must be unique among all the Ptdsf objects in the model.

This attribute is optional. MotionSolve will automatically create an ID when one is not specified.

Range of values: id > 0

label

String

Specifies the name of the Ptdsf object.

This attribute is optional. When not specified, MotionSolve will create a label for you.

active

Bool

Select one from True or False.

•	True indicates that the element is active in the model and it affects the behavior of the system

•	False indicates that the element is inactive in the model and it does not affect the behavior of the system. It is almost as if the entity was removed from the model, of course with the exception that can be turned “ON” when desirable.

The attribute active is optional. When not specified, active defaults to True

Comments

1.	See Properties, for an explanation about what properties are, why they are used and how you can extend these.

2.	For a more detailed explanation about PTSF, see the Comments in the XML syntax section.

Example

1.	Create a PTSF.

# Create the I marker

iMark = Marker (body=p2, qp=[1,2,3], zp=[4,5,6], label="iMark")

# Create the surface object

surface = Surface (function=”user (10)”, routine=cylindricalSurface, uclosed=True,

vclosed=False, minpar=[0, -150], maxpar=[2*pi, 150])

# Finally, create the PTSF constraint

thePtsf = Ptsf (i=iMark, surface= Surface, label=”thePtsf”)