7,271 research outputs found
Search-based 3D Planning and Trajectory Optimization for Safe Micro Aerial Vehicle Flight Under Sensor Visibility Constraints
Safe navigation of Micro Aerial Vehicles (MAVs) requires not only
obstacle-free flight paths according to a static environment map, but also the
perception of and reaction to previously unknown and dynamic objects. This
implies that the onboard sensors cover the current flight direction. Due to the
limited payload of MAVs, full sensor coverage of the environment has to be
traded off with flight time. Thus, often only a part of the environment is
covered.
We present a combined allocentric complete planning and trajectory
optimization approach taking these sensor visibility constraints into account.
The optimized trajectories yield flight paths within the apex angle of a
Velodyne Puck Lite 3D laser scanner enabling low-level collision avoidance to
perceive obstacles in the flight direction. Furthermore, the optimized
trajectories take the flight dynamics into account and contain the velocities
and accelerations along the path.
We evaluate our approach with a DJI Matrice 600 MAV and in simulation
employing hardware-in-the-loop.Comment: In Proceedings of IEEE International Conference on Robotics and
Automation (ICRA), Montreal, Canada, May 201
Joint Synthesis of Trajectory and Controlled Invariant Funnel for Discrete-time Systems with Locally Lipschitz Nonlinearities
This paper presents a joint synthesis algorithm of trajectory and controlled
invariant funnel (CIF) for locally Lipschitz nonlinear systems subject to
bounded disturbances. The CIF synthesis refers to a procedure of computing
controlled invariance sets and corresponding feedback gains. In contrast to
existing CIF synthesis methods that compute the CIF with a pre-defined nominal
trajectory, our work aims to optimize the nominal trajectory and the CIF
jointly to satisfy feasibility conditions without relaxation of constraints and
obtain a more cost-optimal nominal trajectory. The proposed work has a
recursive scheme that mainly optimizes two key components: i) trajectory
update; ii) funnel update. The trajectory update step optimizes the nominal
trajectory while ensuring the feasibility of the CIF. Then, the funnel update
step computes the funnel around the nominal trajectory so that the CIF
guarantees an invariance property. As a result, with the optimized trajectory
and CIF, any resulting trajectory propagated from an initial set by the control
law with the computed feedback gain remains within the feasible region around
the nominal trajectory under the presence of bounded disturbances. We validate
the proposed method via a three dimensional path planning problem with obstacle
avoidance.Comment: Submitted to RA-
Learning in Conferences
{Excerpt} The true value of a conference lies in its effects on participants. Conferences are to generate and share knowledge that impacts behavior and links to results: this will not happen if the state-of-the-art of conference evaluation remains immature and event planners do not shine a light on the conditions for learning outcomes
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