Search Results for author: Hiroyasu Tsukamoto

Found 10 papers, 3 papers with code

CaRT: Certified Safety and Robust Tracking in Learning-based Motion Planning for Multi-Agent Systems

no code implementations13 Jul 2023 Hiroyasu Tsukamoto, Benjamin Rivière, Changrak Choi, Amir Rahmani, Soon-Jo Chung

First, in a nominal setting, the analytical form of our CaRT safety filter formally ensures safe maneuvers of nonlinear multi-agent systems, optimally with minimal deviation from the learning-based policy.

Motion Planning

Interstellar Object Accessibility and Mission Design

no code implementations26 Oct 2022 Benjamin P. S. Donitz, Declan Mages, Hiroyasu Tsukamoto, Peter Dixon, Damon Landau, Soon-Jo Chung, Erica Bufanda, Michel Ingham, Julie Castillo-Rogez

Interstellar objects (ISOs) are fascinating and under-explored celestial objects, providing physical laboratories to understand the formation of our solar system and probe the composition and properties of material formed in exoplanetary systems.

Autonomous Navigation Object

Neural-Rendezvous: Provably Robust Guidance and Control to Encounter Interstellar Objects

no code implementations9 Aug 2022 Hiroyasu Tsukamoto, Soon-Jo Chung, Benjamin Donitz, Michel Ingham, Declan Mages, Yashwanth Kumar Nakka

In particular, it is used to construct a non-negative function with a supermartingale property, explicitly accounting for the ISO state uncertainty and the local nature of nonlinear state estimation guarantees.

A Theoretical Overview of Neural Contraction Metrics for Learning-based Control with Guaranteed Stability

no code implementations2 Oct 2021 Hiroyasu Tsukamoto, Soon-Jo Chung, Jean-Jacques Slotine, Chuchu Fan

This paper presents a theoretical overview of a Neural Contraction Metric (NCM): a neural network model of an optimal contraction metric and corresponding differential Lyapunov function, the existence of which is a necessary and sufficient condition for incremental exponential stability of non-autonomous nonlinear system trajectories.

Contraction Theory for Nonlinear Stability Analysis and Learning-based Control: A Tutorial Overview

no code implementations1 Oct 2021 Hiroyasu Tsukamoto, Soon-Jo Chung, Jean-Jacques E. Slotine

Contraction theory is an analytical tool to study differential dynamics of a non-autonomous (i. e., time-varying) nonlinear system under a contraction metric defined with a uniformly positive definite matrix, the existence of which results in a necessary and sufficient characterization of incremental exponential stability of multiple solution trajectories with respect to each other.

LEMMA

Learning-based Adaptive Control using Contraction Theory

no code implementations4 Mar 2021 Hiroyasu Tsukamoto, Soon-Jo Chung, Jean-Jacques Slotine

Adaptive control is subject to stability and performance issues when a learned model is used to enhance its performance.

Learning-based Robust Motion Planning with Guaranteed Stability: A Contraction Theory Approach

no code implementations25 Feb 2021 Hiroyasu Tsukamoto, Soon-Jo Chung

This paper presents Learning-based Autonomous Guidance with RObustness and Stability guarantees (LAG-ROS), which provides machine learning-based nonlinear motion planners with formal robustness and stability guarantees, by designing a differential Lyapunov function using contraction theory.

Computational Efficiency Imitation Learning +1

Neural Stochastic Contraction Metrics for Learning-based Control and Estimation

1 code implementation6 Nov 2020 Hiroyasu Tsukamoto, Soon-Jo Chung, Jean-Jacques E. Slotine

We present Neural Stochastic Contraction Metrics (NSCM), a new design framework for provably-stable robust control and estimation for a class of stochastic nonlinear systems.

Neural Contraction Metrics for Robust Estimation and Control: A Convex Optimization Approach

4 code implementations8 Jun 2020 Hiroyasu Tsukamoto, Soon-Jo Chung

This paper presents a new deep learning-based framework for robust nonlinear estimation and control using the concept of a Neural Contraction Metric (NCM).

Motion Planning Optimal Motion Planning

Robust Controller Design for Stochastic Nonlinear Systems via Convex Optimization

2 code implementations8 Jun 2020 Hiroyasu Tsukamoto, Soon-Jo Chung

For the sake of its sampling-based implementation, we present discrete-time stochastic contraction analysis with respect to a state- and time-dependent metric along with its explicit connection to continuous-time cases.

Systems and Control Robotics Systems and Control

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