*AtPointJoint()

Creates an at-point joint.

Syntax

*AtPointJoint(joint_name, "joint_label", body_1, body_2, origin, Optional: ALLOW_COMPLIANCE)

Arguments

joint_name
The variable name of the at-point joint.
Data type: varname
joint_label
The descriptive label of the at-point joint.
Data type: label
body_1
The first body constrained by the at-point joint.
Data type: Body
body_2
The second body constrained by the at-point joint.
Data type: Body
origin
The location of the at-point joint for body_1.
Data type: Point
ALLOW_COMPLIANCE
An optional argument that indicates the joint can be made compliant.

Example

*Body(b_kn, "Knuckle", p_kn_cm)
*Body(b_lca, "LCA", p_lca_cm) 
*Point(p_lbj, "Lower ball joint")
*AtPointJoint(lbj, "Lower Ball", b_kn, b_lca,  p_lbj,  ALLOW_COMPLIANCE)

Context

*BeginMdl()

*DefineAnalysis()

*DefineSystem()

Properties

Property Returns Data Type Description
b1 Body The first body constrained by the at-point joint.
b2 Body The second body constrained by the at-point 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 at-point joint.
state boolean Control state (TRUE or FALSE).
type string Unique joint type.
varname string The variable name of the at-point joint.

Comments

*AtPointJoint() is used to join two bodies at a specific 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.