*CurveToCurveJoint()

Creates a curve-to-curve high-pair joint with two rotational degrees of freedom and one translational degree of freedom.

Syntax

*CurveToCurveJoint(cvcv_name,"cvcv_label",body_1, body_2, curve_1, curve_2, ref_marker_1, ref_marker_2, [icm_1], [icm_2], [ALLOW_COMPLIANCE])

Arguments

cvcv_name: The variable name of the curve-to-curve joint.; Data type: varname
cvcv_label: The label of the curve-to-curve joint.; Data type: label
body_1: The first body constrained by the curve-to-curve joint.; Data type: Body
body_2: The second body constrained by the curve-to-curve joint.; Data type: Body
curve_1: The curve on body_1 that is constrained to the curve on body_2 .; Data type: Curve
curve_2: The curve on body_2 that is constrained to the curve on body_1 .; Data type: Curve
ref_marker_1: The reference marker to which the curve_1 data is defined.; Data type: Marker
ref_marker_2: The reference marker to which the curve_2 data is defined.; Data type: Marker
icm_1: An optional argument for the reference marker of the initial condition information for curve_1. If not used, the initial condition information will be with respect to the reference marker_1 .; Data type: Marker
icm_2: An optional argument for the reference marker of the initial condition information for curve_2. If not used, initial condition information will be with respect to the reference marker_2 .; Data type: Marker
ALLOW_COMPLIANCE: An optional argument that indicates that the joint can be made compliant.

Example

*BeginMDL(the_model, "Example CurveToCurveJoint")
 *Marker(mrk_0, "Ref marker for curve 1")
 *Marker(mrk_1, "Ref marker for curve 2")
 *Marker(mrk_2, "ICM marker 1")
 *Marker(mrk_3, "ICM marker 2")
 *Body(bd_0, "First Body")
 *Body(bd_1, "Second Body")
 *Curve(crv_0, "Curve on body 1", WRITE, CURVE_POINTS, CLOSED)
 *Curve(crv_1, "Curve on body 2", WRITE, CURVE_POINTS, CLOSED)
 
 *CurveToCurveJoint( cvcv_0, "cvcv", bd_0, bd_1, crv_0, crv_1, mrk_0, mrk_1 )
*EndMDL()

Context

*BeginMdl()

*DefineAnalysis()

*DefineSystem()

Properties

Table 1.
Property	Returns Data Type	Description
b1	Body	The first body constrained by the curve-to-curve joint.
b2	Body	The second body constrained by the curve-to-curve joint.
crv_1	Curve	The curve on b1 which is constrained to body 2.
crv_2	Curve	The curve on b2 which is constrained to body 1.
i	Marker	The "i" marker in the case of a compliant joint.
icm_1	Marker	The optional reference marker for the initial conditions of the joint on curve 1.
icm_2	Marker	The optional reference marker for the initial conditions of the joint on curve 2.
ic_use_vel_1	boolean	Denotes if the velocity initial conditions are to be used for the contact point on body_1 ^(TRUE or FALSE).
ic_use_vel_2	boolean	Denotes if the velocity initial conditions are to be used for the contact point on body_2 ^(TRUE or FALSE).
ic_use_xyz_1	boolean	Denotes if the displacement initial conditions are to be used for the contact point on body_1 ^(TRUE or FALSE).
ic_use_xyz_2	boolean	Denotes if the displacement initial conditions are to be used for the contact point on body_2 ^(TRUE or FALSE).
ic_x_disp_1	real	The value of the initial displacement of the contact point in the icm_1 x direction. This is applied during the assembly phase of the solver.
ic_x_disp_2	real	The value of the initial displacement of the contact point in the icm_2 x direction. This is applied during the assembly phase of the solver.
ic_y_disp_1	real	The value of the initial displacement of the contact point in the icm_1 y direction. This is applied during the assembly phase of the solver.
ic_y_disp_2	real	The value of the initial displacement of the contact point in the icm_2 y direction. This is applied during the assembly phase of the solver.
ic_z_disp_1	real	The value of the initial displacement of the contact point in the icm_1 z direction. This is applied during the assembly phase of the solver.
ic_z_disp_2	real	The value of the initial displacement of the contact point in the icm_2 z direction. This is applied during the assembly phase of the solver.
ic_vel_1	real	The value of the initial velocity of the point of contact. This is applied during the assembly phase of the solver.
id	integer	Solver input deck identification number.
id_string	string	The ID represented as a string.
ifloat	Marker	The floating marker on body one.
isbush	boolean	See ^Comments^ below.
label	string	The descriptive label of the curve-to-curve joint.
j	Marker	The "j" marker in the case of a compliant joint.
jfloat	Marker	The floating marker on body two.
joint_i	Marker	The "i" marker for the non-compliant joint.
joint_j	Marker	The "j" marker for the non-compliant joint.
note	string	The note on the entity.
num	integer	The unique identification number within MDL.
origin	point	The point on body one which is constrained to body two.
rm	Marker	The reference marker of the curve.
state	boolean	Control state (TRUE or FALSE). This parameter is read only and cannot be directly changed by the user (see ^_user_state^).
type	string	The unique joint type.
user_state	boolean	The state that can be set by the user ^(TRUE or FALSE).
varname	string	The variable name of the curve-to-curve joint.

Comments

The curve-to-curve joint provides three degrees of freedom (DOF): two rotational DOF at the instantaneous point of contact and one translational DOF along the defined path (curve). The curve that is referenced by this joint can be planar or non-planar. Some solvers require that the curve be planar.

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.