...
Open the plotter by selecting "Plot..." from the Tools menu. The X and Y quantities for the plot are selected in the Curve Add panel. Any motions displayed under the Motions tree in the Navigator panel can be plotted. External data can also be Data can be loaded by clicking "Y-Quantity..." and selecting the "Load file..." option (note that the generalized coordinates will appear at the top of the list and the generalized speeds are suffixed with '/speed' ("_u" in versions before 4.0)).
| Expand |
|---|
| title | Click here to show questions for Part I - A… |
|---|
|
| Include Page |
|---|
| _Questions_LegMuscleForceEstimation_I_A |
|---|
| _Questions_LegMuscleForceEstimation_I_A |
|---|
|
|
...
Excite three muscles to minimize the error of the hip flexion, knee angle, and ankle angle coordinates.
| Tip |
|---|
Do not spend a lot of time trying to match the IK solution: it is challenging to do by hand and there are OpenSim Tools that do this (which we will explore below). Simply aim to reduce the error relative to the "FWD_locked" simulation (i.e., with no muscle excitations). |
- By exciting a single muscle in early swing, reduce the error of the hip flexion coordinate in the forward simulation.
- By exciting a second muscle along with your previous excitation, reduce the error of the hip flexion and knee angle coordinates.
- By exciting a third muscle, reduce the error of the hip flexion, knee angle, and ankle angle coordinates.
| Expand |
|---|
| title | Click here to show questions for Part I - B… |
|---|
|
| Include Page |
|---|
| _Questions_LegMuscleForceEstimation_I_B |
|---|
| _Questions_LegMuscleForceEstimation_I_B |
|---|
|
|
...
- In the Input pane, for Controls, navigate to the folder containing the results from Static Optimization and select the controls file.
- In the Input pane, for Initial State, select the storage file that contains the desired initial states (e.g., leg69_Forward_Default_States.sto).
- Check the “Solve for equilibrium for actuator states” box.
- Specify the same time range as before.
- Specify the output directory (e.g., Swing\FWD_SO).
- Save your settings to a file (e.g., leg69_Setup_Forward_SO.xml).
- Run the tool; close the tool when you are finished.
...
| Expand |
|---|
| title | Click here to show questions for Part I - C… |
|---|
|
| Include Page |
|---|
| _Questions_LegMuscleForceEstimation_I_C |
|---|
| _Questions_LegMuscleForceEstimation_I_C |
|---|
|
|
...
- In the Input pane, for Controls, select the controls file generated by CMC.
- In the Input pane, for Initial State, select the states file generated by CMC.
- Check the “Solve for equilibrium for actuator states” box.
- Specify the output directory (e.g., Swing\FWD_CMC).
- Save your settings to a file (e.g., leg69_Setup_Forward_CMC.xml).
- Run the tool; close the tool when you are finished.
...
| Expand |
|---|
| title | Click here to show questions for Part I - D… |
|---|
|
| Include Page |
|---|
| _Questions_LegMuscleForceEstimation_I_D |
|---|
| _Questions_LegMuscleForceEstimation_I_D |
|---|
|
|
...