Verifying IAA induced constraints
Posted: Mon Aug 20, 2018 2:02 am
Hi,
I try to do a verification of induced constraints (rolling-without-slipping) versus experimental GRF, during Walking. I have a Problem with the verification of the Moments/Torques. I read the post of Adam Yoder (viewtopicPhpbb.php?f=1398&t=8339&p=0&st ... 0920dde618) who had the same Problem.
I am not sure if I understood correctly how he solved the Problem. I set the external Forces from Point force to Body force and applied them to Calcaneus. Then I performed IAA. The constraint reaction Ground Forces (total_ground_force_ground_Fx,total_ground_force_ground_Fy,total_ground_force_ground_Fz) are similar to the Ground reaction forces of the external load file (ground_force_vx,ground_force_vy,ground_force_vz) but the constraint reaction Moments are all Zero (total_ground_force_calcn_r_Mx,total_ground_force_calcn_r_My,total_ground_force_calcn_r_Mz). The Ground reaction Moments of the external loads file are similar to Zero but not exactly (ground_torque_x,ground_torque_y,ground_torque_z).
Does anybody know the reason for this?
Thanks in advance.
Regards
Pia
I try to do a verification of induced constraints (rolling-without-slipping) versus experimental GRF, during Walking. I have a Problem with the verification of the Moments/Torques. I read the post of Adam Yoder (viewtopicPhpbb.php?f=1398&t=8339&p=0&st ... 0920dde618) who had the same Problem.
I am not sure if I understood correctly how he solved the Problem. I set the external Forces from Point force to Body force and applied them to Calcaneus. Then I performed IAA. The constraint reaction Ground Forces (total_ground_force_ground_Fx,total_ground_force_ground_Fy,total_ground_force_ground_Fz) are similar to the Ground reaction forces of the external load file (ground_force_vx,ground_force_vy,ground_force_vz) but the constraint reaction Moments are all Zero (total_ground_force_calcn_r_Mx,total_ground_force_calcn_r_My,total_ground_force_calcn_r_Mz). The Ground reaction Moments of the external loads file are similar to Zero but not exactly (ground_torque_x,ground_torque_y,ground_torque_z).
Does anybody know the reason for this?
Thanks in advance.
Regards
Pia