*ScrewJoint()

Creates a screw joint.

Syntax

*ScrewJoint(joint_name, "joint_label", body_1, 
                                                 body_2, 
                                                 origin, 
                                                 POINT|VECTOR, 
                                                 point|vector, 
                                                 [ALLOW_COMPLIANCE]) 
*Set(joint_name.pitch,value)

Arguments

joint_name: The variable name of the screw joint.; Data type: varname
joint_label: The descriptive label of the screw joint.; Data type: label
body_1: The first body constrained by the screw joint.; Data type: Body
body_2: The second body constrained by the screw joint.; Data type: Body
origin: The location of the screw joint for body_1 .; Data type: Point
POINT|VECTOR: A keyword that indicates the alignment method.
point|vector: An entity variable referring to a Point or Vector which is based on the above keyword.; Data type: Point or Vector
ALLOW_COMPLIANCE: An optional argument that indicates the joint can be made compliant.
value: The pitch of the screw joint. Pitch is the amount of translational displacement per revolution of the joint.; Data type: real

Example

*Point( p_0, "Point 0" )
*Point( p_1, "Point 1" )
*Point( p_2, "Point 2" )
*Point( p_3, "Point 3" )
*SetPoint( p_0, 1, 2, 3 )
*SetPoint( p_1, 4, 5, 6 )
*SetPoint( p_2, 7, 8, 9 )
*SetPoint( p_3, 10, 11, 12 )
*Body( b_0, "Body 0", p_0 )
*Body( b_1, "Body 1", p_1 )
*ScrewJoint(j_0, "Single Screw Joint", 
b_0, 
b_1, 
p_0, 
POINT, 
p_1)
*Set(j_0.pitch, 1.5 )

Context

*BeginMdl()

*DefineAnalysis()

*DefineSystem()

Properties

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

Comments

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.

The ALLOW_COMPLIANCE argument is optional. When it is included, it indicates that the joint can be made compliant. In compliant mode, such a joint acts as a bushing.

The isbush property is valid only for joints that can be made compliant. When isbush is set to FALSE, the joint acts like a kinematic joint (in a noncompliant mode). When isbush is set to TRUE, the joint acts like a bushing (in a compliant mode).

When the compliant option in a system is switched to "non-compliant", all the joints in the system act as kinematic joints. However, when the system option is switched to "compliant", only the joints that are created with an ALLOW_COMPLIANCE flag act as bushings. The rest of the joints continue to behave as kinematic joints.