**
** coupling surfaces
**
*surface,name=upper_arm_left_hole_front
upper_arm_left_hole_front,spos
*coupling,ref node=101294,surface=upper_arm_left_hole_front,constraint name=upper_arm_left_hole_front
*distributing
**
**
*surface,name=upper_arm_left_hole_back
upper_arm_left_hole_back,spos
*coupling,ref node=903454,surface=upper_arm_left_hole_back,constraint name=upper_arm_left_hole_back
*distributing
**
**
*surface,name=upper_arm_left_tip
upper_arm_left_tip,spos
*coupling,ref node=906341,surface=upper_arm_left_tip,constraint name=upper_arm_left_tip
*distributing
**--------------------------------------------------------------
** add dummy mass/rotary inertia to coupling ref nodes
*ELEMENT, TYPE=MASS, ELSET=upper_arm_left_mass
802001,101294
802002,903454
802003,906341
*MASS, ELSET=upper_arm_left_mass
<small_mass>,
*ELEMENT, TYPE=ROTARYI, ELSET=upper_arm_left_rotary
802021,101294
802022,903454
802023,906341
*ROTARY INERTIA, ELSET=upper_arm_left_rotary
<small_rota>,<small_rota>,<small_rota>
**--------------------------------------------------------------
*nset,nset=retained_upper_arm_left,unsorted
101294,
903454,
906341,
*nset,nset=retained_all
retained_upper_arm_left,
***