2 code implementations • 9 Mar 2024 • Ryan K. Cosner, Preston Culbertson, Aaron D. Ames
In contrast, this paper utilizes Freedman's inequality in the context of discrete-time control barrier functions (DTCBFs) and c-martingales to provide stronger (less conservative) safety guarantees for stochastic systems.
no code implementations • 10 Nov 2023 • Ryan K. Cosner, Igor Sadalski, Jana K. Woo, Preston Culbertson, Aaron D. Ames
A key source of brittleness for robotic systems is the presence of model uncertainty and external disturbances.
no code implementations • 28 Apr 2023 • Preston Culbertson, Ryan K. Cosner, Maegan Tucker, Aaron D. Ames
Input-to-State Stability (ISS) is fundamental in mathematically quantifying how stability degrades in the presence of bounded disturbances.
no code implementations • 15 Feb 2023 • Ryan K. Cosner, Preston Culbertson, Andrew J. Taylor, Aaron D. Ames
To this end, we leverage Control Barrier Functions (CBFs) which guarantee that a robot remains in a ``safe set'' during its operation -- yet CBFs (and their associated guarantees) are traditionally studied in the context of continuous-time, deterministic systems with bounded uncertainties.
1 code implementation • 21 Dec 2022 • Ryan K. Cosner, Yisong Yue, Aaron D. Ames
Imitation learning (IL) is a learning paradigm which can be used to synthesize controllers for complex systems that mimic behavior demonstrated by an expert (user or control algorithm).
no code implementations • 22 Mar 2022 • Andrew J. Taylor, Victor D. Dorobantu, Ryan K. Cosner, Yisong Yue, Aaron D. Ames
Existing design paradigms do not address the gap between theory (controller design with continuous time models) and practice (the discrete time sampled implementation of the resulting controllers); this can lead to poor performance and violations of safety for hardware instantiations.
1 code implementation • 28 Apr 2021 • Ryan K. Cosner, Andrew W. Singletary, Andrew J. Taylor, Tamas G. Molnar, Katherine L. Bouman, Aaron D. Ames
The increasing complexity of modern robotic systems and the environments they operate in necessitates the formal consideration of safety in the presence of imperfect measurements.
1 code implementation • 30 Oct 2020 • Sarah Dean, Andrew J. Taylor, Ryan K. Cosner, Benjamin Recht, Aaron D. Ames
The guarantees ensured by these controllers often rely on accurate estimates of the system state for determining control actions.