Hi, Yanis.

Thanks a lot for your reply.

the motion file I am currently using is the 'jw_ngait_tm_fast1-new' from the treadmill gait trials and the GRF data is the file of corresponding name.

Linjie

Dear all, Did Anyone encounter the problem that the knee joint forces in 3 translational directions and moments in 3 directions were too high during the process of inverse dynamics? I used the model, motion track and GRF data from the 4th Knee Grand Challenge. The result of inverse kinematics is fin...

Hi, Dimitar.

Thank you very much for your kind help.

Linjie

Hi, Dimitar. Thanks for your reply. Can I ask one more question about the algorithm of elastic foundation force? Will the contact stiffness that is input in contact parameters change with the increment of time intervals, or remain still for whole calculation? Will the penetration amounts between two...

Hi, James. Thanks for your reply. I just reckon the mass of the rest body except both legs which is very close to the one I use. Another finding is that the residual forces are not propotional to the increase of the pelvis mass, which means there is optimal pelvis mass to balance the experimental ex...

The problem of pelvis drifting has been sorted by changing the direction of gravity acceleration. And my oversized residual force in the vertical direction was reduced to suggested range by increasing the mass of pelvis. I dont know if this is allowed, for I dont have the torso added in my model.

Hi! Is there anyone who can help explain the rule of using contact geometry in the musculoskeletal model? I applied the meshed femoral, tibial implants and patella (namely obj files) to my musculoskeletal model in order to calculate the contact force between them during gait simulation. I am confuse...

attached pictures are the GRF acting on the wrong location, drifting away actually with the jumping movement of pelvis during the motion of lower extremity.

I still could not find the setting of "use_fast_optimization_target" but successfully add the constraint file to my RRA analysis through manually copy and paste the file name in the RRA setting xml file. However, so far I still haven't got my residual force result (vertical direction) right, even th...

Thanks, Tom.

And yes, I have seen them before and tried most of those tips except one setting to make sure "use_fast_optimization_target" is false. I dont know how to find that setting file.

thanks,
Linjie