Public Member Functions | Private Attributes | List of all members
trajectory_processing::IterativeSplineParameterization Class Reference

This class sets the timestamps of a trajectory to enforce velocity, acceleration constraints. Initial/final velocities and accelerations may be specified in the trajectory. Velocity and acceleration limits are specified in the model. More...

#include <iterative_spline_parameterization.h>

Public Member Functions

bool computeTimeStamps (robot_trajectory::RobotTrajectory &trajectory, const double max_velocity_scaling_factor=1.0, const double max_acceleration_scaling_factor=1.0) const
 
 IterativeSplineParameterization (bool add_points=true)
 
 ~IterativeSplineParameterization ()
 

Private Attributes

bool add_points_
 

Detailed Description

This class sets the timestamps of a trajectory to enforce velocity, acceleration constraints. Initial/final velocities and accelerations may be specified in the trajectory. Velocity and acceleration limits are specified in the model.

This algorithm repeatedly fits a cubic spline, adjusts the timing intervals, and repeats until all constraints are satisfied. When finished, each trajectory waypoint will have the time set, as well as the velocities and accelerations for each joint. Since we fit to a cubic spline, the position, velocity, and acceleration will be continuous and within bounds. The jerk will be discontinuous.

To match the velocity and acceleration at the endpoints, the second and second-last point locations need to move. By default, two extra points are added to leave the original trajectory unaffected. If points are not added, the trajectory could potentially be faster, but the 2nd and 2nd-last points should be re-checked for collisions.

Migration notes: If migrating from Iterative Parabolic Time Parameterization, be aware that the velocity and acceleration limits are more strictly enforced using this technique. This means that time-parameterizing the same trajectory with the same velocity and acceleration limits, will result in a longer trajectory. If this is a problem, try retuning (increasing) the limits.

Definition at line 74 of file iterative_spline_parameterization.h.

Constructor & Destructor Documentation

trajectory_processing::IterativeSplineParameterization::IterativeSplineParameterization ( bool  add_points = true)

Definition at line 77 of file iterative_spline_parameterization.cpp.

trajectory_processing::IterativeSplineParameterization::~IterativeSplineParameterization ( )

Definition at line 81 of file iterative_spline_parameterization.cpp.

Member Function Documentation

bool trajectory_processing::IterativeSplineParameterization::computeTimeStamps ( robot_trajectory::RobotTrajectory trajectory,
const double  max_velocity_scaling_factor = 1.0,
const double  max_acceleration_scaling_factor = 1.0 
) const

Definition at line 85 of file iterative_spline_parameterization.cpp.

Member Data Documentation

bool trajectory_processing::IterativeSplineParameterization::add_points_
private

Definition at line 84 of file iterative_spline_parameterization.h.


The documentation for this class was generated from the following files:


moveit_core
Author(s): Ioan Sucan , Sachin Chitta , Acorn Pooley
autogenerated on Sat Feb 9 2019 04:09:05