IR-TRACCs length and relative rotation

In the WorldSID model from version 5.0, it is possible to measure the length and relative rotation of IR-TRACCs.

These are measured by key word CONSTRAINED_JOINTSTIFFNESS_TRANSLATIONAL_TITLE and CONSTRAINED_JOINTSTIFFNESS_GENERALIZED_TITLE.

For evaluating signals of length use the output of the jntforc File. Then use type 0 and evaluate y- displacement.

For evaluating signals of relative rotation use the output of the jntforc File. Then use type 1 and evaluate z- displacement.

Some post processors show different component output name. In this case evaluate as follows:

For CONSTRAINED_JOINTSTIFFNESS_TRANSLATIONAL:
theta_degree = y-displacement, length of 2D IR-TRACCs

For CONSTRAINED_JOINTSTIFFNESS_GENERALIZED:
psi_degree = z-displacement, relative rotation degree of 2D IR-TRACCs

The CONSTRAINED_JOINT_STIFFNESS_TRANSLATIONAL cards IDs are shown as follows:

ID	Title	Local direction	component
1043	IR-TRACC shoulder rib length left	y-coordinate	theta_degree
1044	IR-TRACC 1st thorax rib length left	y-coordinate	theta_degree
1045	IR_TRACC 2nd thorax rib length left	y-coordinate	theta_degree
1046	IR-TRACC 3rd thorax rib length left	y-coordinate	theta_degree
1047	IR-TRACC 1st abdomen rib length left	y-coordinate	theta_degree
1048	IR_TRACC 2nd abdomen rib length left	y-coordinate	theta_degree
1057	IR-TRACC shoulder rib length right	y-coordinate	theta_degree
1058	IR-TRACC 1st thorax rib length right	y-coordinate	theta_degree
1059	IR_TRACC 2nd thorax rib length right	y-coordinate	theta_degree
1060	IR-TRACC 3rd thorax rib length right	y-coordinate	theta_degree
1061	IR-TRACC 1st abdomen rib length right	y-coordinate	theta_degree
1062	IR_TRACC 2nd abdomen rib length right	y-coordinate	theta_degree

The CONSTRAINED_JOINT_STIFFNESS_GENERALIZED cards IDs are shown as follows:

ID	Title	Local direction	component
1051	IR-TRACC shoulder rib rotation left	z-coordinate	psi_degree
1052	IR-TRACC 1st thorax rib rotation left	z-coordinate	psi_degree
1053	IR_TRACC 2nd thorax rib rotation left	z-coordinate	psi_degree
1054	IR-TRACC 3rd thorax rib rotation left	z-coordinate	psi_degree
1055	IR-TRACC 1st abdomen rib rotation left	z-coordinate	psi_degree
1056	IR_TRACC 2nd abdomen rib rotation left	z-coordinate	psi_degree
1063	IR-TRACC shoulder rib rotation right	z-coordinate	psi_degree
1064	IR-TRACC 1st thorax rib rotation right	z-coordinate	psi_degree
1065	IR_TRACC 2nd thorax rib rotation right	z-coordinate	psi_degree
1066	IR-TRACC 3rd thorax rib rotation right	z-coordinate	psi_degree
1067	IR-TRACC 1st abdomen rib rotation right	z-coordinate	psi_degree
1068	IR_TRACC 2nd abdomen rib rotation right	z-coordinate	psi_degree