Drake
drake::multibody::benchmarks::pendulum Namespace Reference

## Classes

class  PendulumParameters
This class is used to store the numerical parameters defining the model of a simple pendulum with the method MakePendulumPlant(). More...

## Functions

std::unique_ptr< drake::multibody::multibody_plant::MultibodyPlant< double > > MakePendulumPlant (const PendulumParameters &params, SceneGraph< double > *scene_graph)

std::unique_ptr< drake::multibody::multibody_plant::MultibodyPlant< double > > MakePendulumPlant (const PendulumParameters &default_parameters, geometry::SceneGraph< double > *scene_graph=nullptr)
This method makes a MultibodyPlant model of an idealized pendulum with a point mass at the end of a massless rigid rod. More...

## Function Documentation

 std::unique_ptr > drake::multibody::benchmarks::pendulum::MakePendulumPlant ( const PendulumParameters & params, SceneGraph< double > * scene_graph )

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 std::unique_ptr > drake::multibody::benchmarks::pendulum::MakePendulumPlant ( const PendulumParameters & default_parameters, geometry::SceneGraph< double > * scene_graph = nullptr )

This method makes a MultibodyPlant model of an idealized pendulum with a point mass at the end of a massless rigid rod.

The pendulum oscillates in the x-z plane with its revolute axis coincident with the y-axis. Gravity points downwards in the -z axis direction.

The parameters of the plant are:

• mass: the mass of the idealized point mass.
• length: the length of the massless rod on which the mass is suspended.
• gravity: the acceleration of gravity.

The simple pendulum is a canonical dynamical system as described in Chapter 2 of Underactuated Robotics.

Parameters
 [in] default_parameters Default parameters of the model set at construction. Refer to the documentation of PendulumParameters for further details. scene_graph If a SceneGraph is provided with this argument, this factory method will register the new multibody plant to be a source for that geometry system and it will also register geometry for visualization. If this argument is omitted, no geometry will be registered.