Merge pull request #2632 from clnsmith/Blankevoort1991Ligament

Blankevoort1991Ligament

Author: chrisdembia

Bindings/OpenSimHeaders_simulation.h

@@ -109,6 +109,7 @@
 #include <OpenSim/Simulation/Model/PointForceDirection.h>
 #include <OpenSim/Simulation/Model/GeometryPath.h>
 #include <OpenSim/Simulation/Model/Ligament.h>
+#include <OpenSim/Simulation/Model/Blankevoort1991Ligament.h>
 
 #include <OpenSim/Simulation/SimbodyEngine/Constraint.h>
 #include <OpenSim/Simulation/Model/ConstraintSet.h>

Bindings/simulation.i

@@ -191,6 +191,7 @@ OpenSim::ModelComponentSet<OpenSim::Controller>;
 
 %include <OpenSim/Simulation/Model/GeometryPath.h>
 %include <OpenSim/Simulation/Model/Ligament.h>
+%include <OpenSim/Simulation/Model/Blankevoort1991Ligament.h>
 %include <OpenSim/Simulation/Model/PathActuator.h>
 %include <OpenSim/Simulation/Model/Muscle.h>
 %include <OpenSim/Simulation/Model/ActivationFiberLengthMuscle.h>

CHANGELOG.md

@@ -23,6 +23,7 @@ v4.1
 - The new Stopwatch class allows C++ API users to easily measure the runtime of their code.
 - If finalizeConnections() method was not called on a model after making changes and before printing, an exception is thrown to avoid creating corrupt model files quietly (PR #2529)
 - Updated the docopt.cpp dependency so that OpenSim can be compiled with Visual C++ from Visual Studio 2019.
+- Added `Blankevoort1991Ligament` force component which represents ligament fibers as non-linear path springs. The force-strain curve has a quadratic toe region at low strains and a linear stiffness region at high strains. (PR #2632)  
 - Updated Simbody to 3.7 to fix an issue with the simbody-visualizer on macOS 10.15 Catalina.
 - On Mac and Linux, we include a shell script opensim-install-command-line.sh to make OpenSim's command-line tools easily accessible.
 - Added the compliant SmoothSphereHalfSpaceForce component, for use with direct collocation and Moco.