#include <dynamics_solver.h>
Public Types | |
typedef Eigen::Matrix< T, NX, NU > | ControlDerivative |
Convenience definition for a ControlDerivative. More... | |
typedef Eigen::Matrix< T, NU, 1 > | ControlVector |
Convenience definition for a ControlVector (dimension NU x 1) More... | |
typedef Eigen::Matrix< T, NX, NX > | StateDerivative |
Convenience definition for a StateDerivative. More... | |
typedef Eigen::Matrix< T, NX, 1 > | StateVector |
Convenience definition for a StateVector containing both position and velocity (dimension NX x 1) More... | |
Public Member Functions | |
AbstractDynamicsSolver () | |
virtual void | AssignScene (std::shared_ptr< Scene > scene_in) |
Passes the Scene of the PlanningProblem to the DynamicsSolver. More... | |
void | ClampToStateLimits (Eigen::Ref< Eigen::VectorXd > state_in) |
Clamps the passed in state to the state limits. More... | |
virtual void | ComputeDerivatives (const StateVector &x, const ControlVector &u) |
Computes derivatives fx, fu, Fx, Fu [single call for efficiency, derivatives can be retrieved with get_fx, get_fu, get_Fx, get_Fu]. More... | |
virtual Hessian | ddStateDelta (const StateVector &x_1, const StateVector &x_2, const ArgumentPosition first_or_second) |
virtual Eigen::Matrix< T, Eigen::Dynamic, Eigen::Dynamic > | dStateDelta (const StateVector &x_1, const StateVector &x_2, const ArgumentPosition first_or_second) |
Return the difference of the StateDelta operation between two state vectors. The ArgumentPosition argument can be used to select whether to take derivative w.r.t. x_1 or x_2. More... | |
virtual StateVector | f (const StateVector &x, const ControlVector &u)=0 |
Forward dynamics. This computes the differential dynamics. More... | |
virtual StateVector | F (const StateVector &x, const ControlVector &u) |
State transition function. This internally computes the differential dynamics and applies the chosen integration scheme. More... | |
virtual ControlDerivative | fu (const StateVector &x, const ControlVector &u) |
Derivative of the forward dynamics w.r.t. the control. More... | |
ControlDerivative | fu_fd (const StateVector &x, const ControlVector &u) |
Derivative of the forward dynamics w.r.t. the control [finite differencing]. More... | |
virtual Eigen::Tensor< T, 3 > | fuu (const StateVector &x, const ControlVector &u) |
virtual StateDerivative | fx (const StateVector &x, const ControlVector &u) |
Derivative of the forward dynamics w.r.t. the state. More... | |
StateDerivative | fx_fd (const StateVector &x, const ControlVector &u) |
Derivative of the forward dynamics w.r.t. the state [finite differencing]. More... | |
virtual Eigen::Tensor< T, 3 > | fxu (const StateVector &x, const ControlVector &u) |
virtual Eigen::Tensor< T, 3 > | fxx (const StateVector &x, const ControlVector &u) |
const Eigen::MatrixXd & | get_control_limits () |
Returns the control limits vector. More... | |
T | get_dt () const |
Returns integration timestep dt. More... | |
const ControlDerivative & | get_Fu () const |
Returns derivative Fu computed by ComputeDerivatives. More... | |
const ControlDerivative & | get_fu () const |
Returns derivative fu computed by ComputeDerivatives. More... | |
const StateDerivative & | get_Fx () const |
Returns derivative Fx computed by ComputeDerivatives. More... | |
const StateDerivative & | get_fx () const |
Returns derivative fx computed by ComputeDerivatives. More... | |
const bool & | get_has_second_order_derivatives () const |
Returns whether second-order derivatives are available. More... | |
const bool & | get_has_state_limits () const |
Returns whether state limits are available. More... | |
Integrator | get_integrator () const |
Returns used integration scheme. More... | |
int | get_num_controls () const |
Returns number of controls. More... | |
int | get_num_positions () const |
Returns number of positions. More... | |
int | get_num_state () const |
Returns size of state space (nx) More... | |
int | get_num_state_derivative () const |
Returns size of derivative vector of state space (ndx) More... | |
int | get_num_velocities () const |
Returns number of velocities. More... | |
virtual Eigen::Matrix< T, Eigen::Dynamic, 1 > | GetPosition (Eigen::VectorXdRefConst x_in) |
Returns the position-part of the state vector to update the scene. For types including SE(3) and rotation, convert to the appropriate representation here by overriding this method. More... | |
virtual void | InstantiateBase (const Initializer &init) |
Instantiates the base properties of the DynamicsSolver. More... | |
virtual void | Integrate (const StateVector &x, const StateVector &dx, const double dt, StateVector &xout) |
Integrates without performing dynamics. More... | |
virtual ControlVector | InverseDynamics (const StateVector &state) |
Returns a control vector corresponding to the state vector assuming zero acceleration. More... | |
void | set_control_limits (Eigen::VectorXdRefConst control_limits_low, Eigen::VectorXdRefConst control_limits_high) |
Sets the control limits. More... | |
void | set_integrator (Integrator integrator_in) |
Sets integrator type. More... | |
virtual void | SetDt (double dt_in) |
Sets the timestep dt to be used for integration. More... | |
void | SetIntegrator (const std::string &integrator_in) |
Sets integrator type based on request string. More... | |
StateVector | Simulate (const StateVector &x, const ControlVector &u, T t) |
Simulates the dynamic system from starting state x using control u for t seconds. More... | |
virtual StateVector | StateDelta (const StateVector &x_1, const StateVector &x_2) |
Return the difference of two state vectors. Used when e.g. angle differences need to be wrapped from [-pi; pi] Returns x_1-x_2. More... | |
void | StateDelta (const StateVector &x_1, const StateVector &x_2, Eigen::VectorXdRef xout) |
virtual | ~AbstractDynamicsSolver () |
Public Member Functions inherited from exotica::Object | |
std::string | GetObjectName () |
void | InstantiateObject (const Initializer &init) |
Object () | |
virtual std::string | Print (const std::string &prepend) const |
virtual std::string | type () const |
Type Information wrapper: must be virtual so that it is polymorphic... More... | |
virtual | ~Object () |
Public Member Functions inherited from exotica::InstantiableBase | |
virtual std::vector< Initializer > | GetAllTemplates () const =0 |
virtual Initializer | GetInitializerTemplate ()=0 |
InstantiableBase ()=default | |
virtual void | InstantiateInternal (const Initializer &init)=0 |
virtual | ~InstantiableBase ()=default |
Protected Member Functions | |
void | InitializeSecondOrderDerivatives () |
virtual StateVector | SimulateOneStep (const StateVector &x, const ControlVector &u) |
Integrates the dynamic system from state x with controls u applied for one timestep dt using the selected integrator. More... | |
Protected Attributes | |
Eigen::MatrixXd | control_limits_ |
ControlLimits. Default is empty vector. More... | |
T | dt_ = 0.01 |
Internal timestep used for integration. Defaults to 10ms. More... | |
Eigen::MatrixXd | fu_ |
Internal storage of differential dynamics partial derivative fu computed by ComputeDerivatives. More... | |
Eigen::MatrixXd | Fu_ |
Internal storage of state transition partial derivative Fu computed by ComputeDerivatives. More... | |
Eigen::Tensor< T, 3 > | fuu_default_ |
Eigen::MatrixXd | fx_ |
Internal storage of differential dynamics partial derivative fx computed by ComputeDerivatives. More... | |
Eigen::MatrixXd | Fx_ |
Internal storage of state transition partial derivative Fx computed by ComputeDerivatives. More... | |
Eigen::Tensor< T, 3 > | fxu_default_ |
Eigen::Tensor< T, 3 > | fxx_default_ |
bool | has_second_order_derivatives_ = false |
Whether this solver provides second order derivatives. If false (default), assumed to be all zeros. More... | |
bool | has_state_limits_ = false |
Whether the solver specifies state limits. More... | |
Integrator | integrator_ = Integrator::RK1 |
Chosen integrator. Defaults to Euler (RK1). More... | |
int | num_controls_ = -1 |
Number of controls in the dynamic system. More... | |
int | num_positions_ = -1 |
Number of positions in the dynamic system. More... | |
int | num_state_ = -1 |
Size of state space (num_positions + num_velocities) More... | |
int | num_state_derivative_ = -1 |
Size of the tangent vector to the state space (2 * num_velocities) More... | |
int | num_velocities_ = -1 |
Number of velocities in the dynamic system. More... | |
bool | second_order_derivatives_initialized_ = false |
Whether fxx, fxu and fuu have been initialized to 0. More... | |
Eigen::VectorXd | state_limits_lower_ |
Lower state limits (configuration and velocity) More... | |
Eigen::VectorXd | state_limits_upper_ |
Upper state limits (configuration and velocity) More... | |
Private Attributes | |
bool | control_limits_initialized_ = false |
Hessian | ddStateDelta_ |
Eigen::MatrixXd | dStateDelta_ |
Eigen::VectorXd | raw_control_limits_high_ |
Eigen::VectorXd | raw_control_limits_low_ |
Additional Inherited Members | |
Public Attributes inherited from exotica::Object | |
bool | debug_ |
std::string | ns_ |
std::string | object_name_ |
Private Member Functions inherited from exotica::Uncopyable | |
Uncopyable ()=default | |
~Uncopyable ()=default | |
Definition at line 55 of file dynamics_solver.h.
typedef Eigen::Matrix<T, NX, NU> exotica::AbstractDynamicsSolver< T, NX, NU >::ControlDerivative |
Convenience definition for a ControlDerivative.
Definition at line 61 of file dynamics_solver.h.
typedef Eigen::Matrix<T, NU, 1> exotica::AbstractDynamicsSolver< T, NX, NU >::ControlVector |
Convenience definition for a ControlVector (dimension NU x 1)
Definition at line 59 of file dynamics_solver.h.
typedef Eigen::Matrix<T, NX, NX> exotica::AbstractDynamicsSolver< T, NX, NU >::StateDerivative |
Convenience definition for a StateDerivative.
Definition at line 60 of file dynamics_solver.h.
typedef Eigen::Matrix<T, NX, 1> exotica::AbstractDynamicsSolver< T, NX, NU >::StateVector |
Convenience definition for a StateVector containing both position and velocity (dimension NX x 1)
Definition at line 58 of file dynamics_solver.h.
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Passes the Scene of the PlanningProblem to the DynamicsSolver.
Called immediately after creation of the DynamicsSolver plug-in using a pointer to the Scene of the PlanningProblem. This can be used to extract required information from the Scene, e.g., URDF, dimensionality, etc.
Definition at line 58 of file dynamics_solver.cpp.
void exotica::AbstractDynamicsSolver< T, NX, NU >::ClampToStateLimits | ( | Eigen::Ref< Eigen::VectorXd > | state_in | ) |
Clamps the passed in state to the state limits.
Definition at line 279 of file dynamics_solver.cpp.
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Computes derivatives fx, fu, Fx, Fu [single call for efficiency, derivatives can be retrieved with get_fx, get_fu, get_Fx, get_Fu].
Definition at line 407 of file dynamics_solver.cpp.
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Definition at line 162 of file dynamics_solver.h.
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Return the difference of the StateDelta operation between two state vectors. The ArgumentPosition argument can be used to select whether to take derivative w.r.t. x_1 or x_2.
Definition at line 149 of file dynamics_solver.h.
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Forward dynamics. This computes the differential dynamics.
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State transition function. This internally computes the differential dynamics and applies the chosen integration scheme.
Definition at line 63 of file dynamics_solver.cpp.
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Derivative of the forward dynamics w.r.t. the control.
Definition at line 401 of file dynamics_solver.cpp.
Eigen::Matrix< T, NX, NU > exotica::AbstractDynamicsSolver< T, NX, NU >::fu_fd | ( | const StateVector & | x, |
const ControlVector & | u | ||
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Derivative of the forward dynamics w.r.t. the control [finite differencing].
Definition at line 379 of file dynamics_solver.cpp.
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Definition at line 320 of file dynamics_solver.cpp.
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Derivative of the forward dynamics w.r.t. the state.
Definition at line 373 of file dynamics_solver.cpp.
Eigen::Matrix< T, NX, NX > exotica::AbstractDynamicsSolver< T, NX, NU >::fx_fd | ( | const StateVector & | x, |
const ControlVector & | u | ||
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Derivative of the forward dynamics w.r.t. the state [finite differencing].
Definition at line 340 of file dynamics_solver.cpp.
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Definition at line 327 of file dynamics_solver.cpp.
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Definition at line 313 of file dynamics_solver.cpp.
const Eigen::MatrixXd & exotica::AbstractDynamicsSolver< T, NX, NU >::get_control_limits | ( | ) |
Returns the control limits vector.
Definition at line 247 of file dynamics_solver.cpp.
T exotica::AbstractDynamicsSolver< T, NX, NU >::get_dt | ( | ) | const |
Returns integration timestep dt.
Definition at line 214 of file dynamics_solver.cpp.
const Eigen::Matrix< T, NX, NU > & exotica::AbstractDynamicsSolver< T, NX, NU >::get_Fu | ( | ) | const |
Returns derivative Fu computed by ComputeDerivatives.
Definition at line 470 of file dynamics_solver.cpp.
const Eigen::Matrix< T, NX, NU > & exotica::AbstractDynamicsSolver< T, NX, NU >::get_fu | ( | ) | const |
Returns derivative fu computed by ComputeDerivatives.
Definition at line 458 of file dynamics_solver.cpp.
const Eigen::Matrix< T, NX, NX > & exotica::AbstractDynamicsSolver< T, NX, NU >::get_Fx | ( | ) | const |
Returns derivative Fx computed by ComputeDerivatives.
Definition at line 464 of file dynamics_solver.cpp.
const Eigen::Matrix< T, NX, NX > & exotica::AbstractDynamicsSolver< T, NX, NU >::get_fx | ( | ) | const |
Returns derivative fx computed by ComputeDerivatives.
Definition at line 452 of file dynamics_solver.cpp.
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Returns whether second-order derivatives are available.
Definition at line 111 of file dynamics_solver.h.
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Returns whether state limits are available.
Definition at line 214 of file dynamics_solver.h.
Integrator exotica::AbstractDynamicsSolver< T, NX, NU >::get_integrator | ( | ) | const |
Returns used integration scheme.
Definition at line 220 of file dynamics_solver.cpp.
int exotica::AbstractDynamicsSolver< T, NX, NU >::get_num_controls | ( | ) | const |
Returns number of controls.
Definition at line 178 of file dynamics_solver.cpp.
int exotica::AbstractDynamicsSolver< T, NX, NU >::get_num_positions | ( | ) | const |
Returns number of positions.
Definition at line 184 of file dynamics_solver.cpp.
int exotica::AbstractDynamicsSolver< T, NX, NU >::get_num_state | ( | ) | const |
Returns size of state space (nx)
Definition at line 196 of file dynamics_solver.cpp.
int exotica::AbstractDynamicsSolver< T, NX, NU >::get_num_state_derivative | ( | ) | const |
Returns size of derivative vector of state space (ndx)
Definition at line 205 of file dynamics_solver.cpp.
int exotica::AbstractDynamicsSolver< T, NX, NU >::get_num_velocities | ( | ) | const |
Returns number of velocities.
Definition at line 190 of file dynamics_solver.cpp.
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Returns the position-part of the state vector to update the scene. For types including SE(3) and rotation, convert to the appropriate representation here by overriding this method.
Definition at line 171 of file dynamics_solver.cpp.
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Definition at line 290 of file dynamics_solver.cpp.
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Instantiates the base properties of the DynamicsSolver.
Reimplemented from exotica::InstantiableBase.
Definition at line 42 of file dynamics_solver.cpp.
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Integrates without performing dynamics.
Definition at line 122 of file dynamics_solver.cpp.
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Returns a control vector corresponding to the state vector assuming zero acceleration.
Definition at line 334 of file dynamics_solver.cpp.
void exotica::AbstractDynamicsSolver< T, NX, NU >::set_control_limits | ( | Eigen::VectorXdRefConst | control_limits_low, |
Eigen::VectorXdRefConst | control_limits_high | ||
) |
Sets the control limits.
Definition at line 255 of file dynamics_solver.cpp.
void exotica::AbstractDynamicsSolver< T, NX, NU >::set_integrator | ( | Integrator | integrator_in | ) |
Sets integrator type.
Definition at line 226 of file dynamics_solver.cpp.
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Sets the timestep dt to be used for integration.
Definition at line 70 of file dynamics_solver.cpp.
void exotica::AbstractDynamicsSolver< T, NX, NU >::SetIntegrator | ( | const std::string & | integrator_in | ) |
Sets integrator type based on request string.
Definition at line 232 of file dynamics_solver.cpp.
Eigen::Matrix< T, NX, 1 > exotica::AbstractDynamicsSolver< T, NX, NU >::Simulate | ( | const StateVector & | x, |
const ControlVector & | u, | ||
T | t | ||
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Simulates the dynamic system from starting state x using control u for t seconds.
Simulates the system and steps the simulation by timesteps dt for a total time of t using the specified integration scheme starting from state x and with controls u.
Definition at line 159 of file dynamics_solver.cpp.
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Integrates the dynamic system from state x with controls u applied for one timestep dt using the selected integrator.
Definition at line 77 of file dynamics_solver.cpp.
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Return the difference of two state vectors. Used when e.g. angle differences need to be wrapped from [-pi; pi] Returns x_1-x_2.
Definition at line 136 of file dynamics_solver.h.
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Definition at line 142 of file dynamics_solver.h.
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ControlLimits. Default is empty vector.
Definition at line 252 of file dynamics_solver.h.
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Definition at line 229 of file dynamics_solver.h.
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Definition at line 232 of file dynamics_solver.h.
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Definition at line 231 of file dynamics_solver.h.
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Internal timestep used for integration. Defaults to 10ms.
Definition at line 248 of file dynamics_solver.h.
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Internal storage of differential dynamics partial derivative fu computed by ComputeDerivatives.
Definition at line 262 of file dynamics_solver.h.
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Internal storage of state transition partial derivative Fu computed by ComputeDerivatives.
Definition at line 264 of file dynamics_solver.h.
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Definition at line 259 of file dynamics_solver.h.
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Internal storage of differential dynamics partial derivative fx computed by ComputeDerivatives.
Definition at line 261 of file dynamics_solver.h.
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Internal storage of state transition partial derivative Fx computed by ComputeDerivatives.
Definition at line 263 of file dynamics_solver.h.
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Definition at line 259 of file dynamics_solver.h.
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Definition at line 259 of file dynamics_solver.h.
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Whether this solver provides second order derivatives. If false (default), assumed to be all zeros.
Definition at line 241 of file dynamics_solver.h.
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Whether the solver specifies state limits.
Definition at line 244 of file dynamics_solver.h.
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Chosen integrator. Defaults to Euler (RK1).
Definition at line 249 of file dynamics_solver.h.
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Number of controls in the dynamic system.
Definition at line 235 of file dynamics_solver.h.
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Number of positions in the dynamic system.
Definition at line 236 of file dynamics_solver.h.
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Size of state space (num_positions + num_velocities)
Definition at line 238 of file dynamics_solver.h.
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Size of the tangent vector to the state space (2 * num_velocities)
Definition at line 239 of file dynamics_solver.h.
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Number of velocities in the dynamic system.
Definition at line 237 of file dynamics_solver.h.
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Definition at line 230 of file dynamics_solver.h.
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Definition at line 230 of file dynamics_solver.h.
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Whether fxx, fxu and fuu have been initialized to 0.
Definition at line 242 of file dynamics_solver.h.
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Lower state limits (configuration and velocity)
Definition at line 245 of file dynamics_solver.h.
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Upper state limits (configuration and velocity)
Definition at line 246 of file dynamics_solver.h.