*PerpAxesJoint()

Creates a perpendicular axes joint.

Syntax

*PerpAxesJoint(joint_name,"joint_label",body_1, body_2, origin, POINT|VECTOR, point_1|vector_1, POINT|VECTOR, point_2|vector_2)

Arguments

joint_name
The variable name of the perpendicular axis joint.
Data type: varname
joint_label
The descriptive label of the perpendicular axis joint.
Data type: label
body_1
The first body constrained by the perpendicular axis joint.
Data type: Body
body_2
The second body constrained by the perpendicular axis joint.
Data type: Body
origin
The location of the perpendicular axis joint.
Data type: Point
POINT|VECTOR
A keyword that indicates the alignment method.
point_1|vector_1
An entity variable referring to a Point or Vector which is based on the above keyword.
Data type: Point or Vector
POINT|VECTOR
A keyword that indicates the alignment method.
point_2|vector_2
An entity variable referring to a Point or Vector which is based on the above keyword.
Data type: Point or Vector

Example

*Body(body_1,   "First body",  p_1)
*Body(body_2,   "Second body", p_2)
*Point(point_1, "First point")
*Point(point_2, "Second point")
*Point(p_origin, "origin")
*PerpAxesJoint(Perpendicular axis, "Orientation joint", 
                                                body_1, 
                                                body_2, 
                                                p_origin, 
                                                POINT, 
                                                point_1, 
                                                POINT, 
                                                point_2)

Context

*BeginMdl()

*DefineAnalysis()

*DefineSystem()

Properties

Table 1.
Property Returns Data Type Description
b1 Body The first body constrained by the perpendicular axes joint.
b2 Body The second body constrained by the perpendicular axes joint.
i Marker The marker on b1.
id long integer Solver identification number.
j Marker The marker on b2.
label string The descriptive label of the perpendicular axes joint.
state boolean Control state (TRUE or FALSE).
type string Unique joint type.
varname string The variable name of the perpendicular axes joint.

Comments

A perpendicular axes joint constrains the relative rotation between two bodies in such a way that the specified axes attached to the two bodies always remain mutually perpendicular.

When a point is used (instead of a vector) to define an axis, it is obtained as the direction from the origin of the joint to the specified point.