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The Output Reporter is an Analysis tool (available in OpenSim version 4.0 and later) that allows users to tailor their analysis workflow to their exact needs. In particular the output reporter allows you to output quantities of interest (e.g., moment arms, kinematics of the COM, muscle fiber lengths, and more) from a simulation. In this example, we'll use a results from a previously generated jumping simulation to explore the Output Reporter.TODO: Add a link to the relevant webinar(s). OpenSim 4.0 webinar and potentially ESB webinar, as well.
Versions of this example have been presented in the following webinars as well:
Model and Simulation Background
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The simulation was created following an Inverse Problem approach. Specifically, Inverse Kinematics was used to find the joint angles that best reproduce the experimental marker positions of the subject performing a maximum-height jump. The Residual Reduction Algorithm tool was used to adjust the model's torso mass parameters so that the motion from Inverse Kinematics with the model is more dynamically consistent with ground reaction data. Finally, Computed Muscle Control was used to estimate muscle excitation and other muscle and tendon states during the jump.
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- Find the two muscles, "soleus_r" and "gastroc_r" by expanding "Forces", then "Muscles".
- For each muscle, go to the Outputs tab and find the "active_force_length_multiplier" output.
- Write down the full path of (or highlight and copy) the "active_force_length_multiplier" output for each muscle.
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The setup file defaults to printing the output files to the newly created folder "Results_PlantarflexorOutputs". To examine the output, we'll use the Plotter tool.
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