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Coverage control in constant flow environments based on a mixed energy-time metric. (2013)

by Y Ru, S Martinez
Venue:Automatica,
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Robust, distributed estimation of internal wave parameters via inter-drogue measurements 1

by Michael Ouimet, Jorge Cortés
"... Internal waves are important to oceanographers because, as they travel, they are capable of displacing mass, such as plankton and small fish. This paper considers a group of drogues estimating the physical parameters that determine the dynamics of an ocean linear internal wave. While underwater, ind ..."
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Internal waves are important to oceanographers because, as they travel, they are capable of displacing mass, such as plankton and small fish. This paper considers a group of drogues estimating the physical parameters that determine the dynamics of an ocean linear internal wave. While underwater, individual drogues do not have access to absolute position information and can only rely on interdrogue measurements. Building on this data and the knowledge of the drogue dynamics under the flow induced by the internal wave, we propose the Vanishing Distance Derivative Detection Strategy to allow individual drogues to determine the wave parameters. We analyze the correctness and robustness of this strategy under noiseless and noisy measurements, respectively. We also introduce a general methodology, termed pth-Order Parameter Fusion, for combining parameter estimates obtained at different times and characterize the resulting error. Several simulations illustrate our results. I.

Deployment algorithms for dynamically constrained mobile robots

by Sonia Martínez , 2012
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Placement and motion planning algorithms . . .

by Pratap Rajkumar Tokekar , 2014
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Partitioning Algorithms for Multi-Agent Systems Based on Finite-Time Proximity Metrics ⋆

by Efstathios Bakolas
"... Abstract We address a generalized Voronoi partitioning problem for a team of mobile agents with nonlinear dynamics with respect to a state-dependent proximity metric. In particular, the proximity (pseudo-) metric corresponds to the reduction of a generalized energy metric that occurs during the tra ..."
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Abstract We address a generalized Voronoi partitioning problem for a team of mobile agents with nonlinear dynamics with respect to a state-dependent proximity metric. In particular, the proximity (pseudo-) metric corresponds to the reduction of a generalized energy metric that occurs during the transfer of an agent to an arbitrary destination with zero terminal velocity, in finite time. The realization of every finite-time state transition takes place by means of a class of continuous feedback control laws that render the closed loop dynamics of each mobile agent non-Lipschitzian. The arrival time also turns out to be a state-dependent quantity, whose functional description is not prescribed a priori. We show that the partitioning problem studied in this work can admit a decentralized solution, that is, each agent can compute its own cell independently from its teammates provided that is aware of the positions and velocities of its neighboring agents. Numerical simulations that illustrate the theoretical developments are also presented.
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...tion, that is, each agent can compute its own cell independently from its teammates provided that is aware of the positions and velocities of its neighboring agents. Numerical simulations that illustrate the theoretical developments are also presented. Key words: Autonomous agents, Voronoi diagrams, partitioning algorithms, finite-time control, computational methods. 1 Introduction The importance of using state-dependent proximitymetrics in partitioning problems related to applications of multi-agent dynamical systems was first identified in [3] and subsequently extended in a series of papers [1, 2, 4, 13]. In particular, as is stressed in [3], the use of statedependent proximity metrics leads to spatial partitions that encode proximity information that succinctly captures the dynamic characteristics of the agents; something that cannot be achieved with more standard spatial partitions [11], whose proximity metrics stem from geometric considerations primarily. A typical problem in which the proposed class of spatial partitions could play a key role is the following: A team of agents are seeking for an optimal way to subdivide a common subset of their state space such that they can share among t...

Dedication.....................................

by unknown authors , 2013
"... quality and form for publication on microfilm ..."
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quality and form for publication on microfilm
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...sired destination. An increasing body of work in the systems and control literature deals with cooperative networks of agents estimating spatial natural phenomena, including ocean [49, 68, 33], river =-=[78]-=-, and hurricane sampling [21]. In the problem considered here, drogues are able to actuate their depth through buoyancy changes, but are completely subject to the force of the internal wave in the flo...

Collective estimation of ocean nonlinear 1

by Michael Ouimet, Jorge Cortés
"... internal waves using robotic underwater drifters ..."
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internal waves using robotic underwater drifters
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...9) by the Association for the Sciences of Limnology and Oceanography, Inc., see [1] for additional information. of agents estimating spatial natural phenomena, including ocean [17], [18], [19], river =-=[20]-=-, and hurricane sampling [21]. This work builds off our previous work [22], which considers a similar estimation problem for linear internal waves. The nonlinear wave case considered here presents nov...

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