Hi there, I'm struggling to understand the theory behind the acceleration calculation in Opensim. Which specific formulas are used for point acceleration in the OpenSim? Or a quick question is the linear acceleration calculated as the second derivative of the origin of the segment coordinate systems...

Hi Dimitar, Sorry for the late reply for thanks. I'm still struggling to understand the theory behind the acceleration calculation in Opensim. Which specific formulas are used for point acceleration in the Opensim. Or a quick question is the linear acceleration calculated as the second derivative of...

Hi there, I get results of body kinematic by using inverse kinematic results. The simulated motion is squatting. The results of linear/angular velocity of each body segments look reasonable, but both of linear and angular accelerations are too large. I am quite confused. Is there anything wrong? The...

Hi, I'm using the Analyze tool to get results of body kinematic (inputs: scaled model, the result of inverse kinematic to, ground reaction force file). I'm not quite sure the labels meaning in the output file. What's the difference between "pelvis_X" and "pelvis_Ox"? Which one is the linear accelera...

Hi Nicos,

Thank you so much for your reply and shared information!

Hi there, I want to get simulated IMU data at different positions based on the time history of motion capture data.I'd like to know is it possible to run forward kinematic in Opensim. I only find inverse kinematics and forward dynamics tools in the Opensim. Or is it possible to get linear accelerati...

Hi there, I want to get simulated IMU data at different positions based on the time history of motion capture data.I'd like to know is it possible to run forward kinematic in Opensim. I only find inverse kinematics and forward dynamics tools in the Opensim. Or is it possible to get linear accelerati...

Hi there, In the step of scaling, the max marker error (ELBOW_R_MED) I got is 0.07088 and RMS is 0.03375. I'd like to know what the recommended marker error range? I have checked the tutorial document which says "In general, maximum marker errors for bony landmarks should be less than 2 cm. RMS erro...

Hi, I meet a problem when scaling. When I upload the experimental trajectory data & static data, click the preview option and run the scale tool, I can't see my experimental markers on the model. I watched the tutorial video. There should be experimental markers in blue and virtual markers in pink a...