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Decentralized Control of Multiagent Navigation Systems

IEEE/CAA Journal of Automatica Sinica 2022年第5期9卷 922-925页

作者： Boyang Zhang henri p.gavin IEEE Department of Civil and Environmental Engineering Duke UniversityDurhamNC 27708 USA

Dear editor,In this letter,we introduce a decentralized,nonlinear,discontinuous,and computationally simple control law for large scale multiagent navigation *** control is based on extending Gauss’s principle of least constraint with a dynamic incorporation of inequality constraints,actuator saturation,and actuator *** no individual path planner,each agent executes its motion and generates its control actions by reacting solely to the evolution of its constrained dynamics,which is equivalent to solving a linear matrix equation with a dimension up to around 20 without iteration at each time *** experiments are conducted on hundreds of two-dimensional(2-D)double integrators subjected to path and collision constraints,demonstrating the promise of the proposed method.

关键词： dynamics method constraints

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Modeling chemical releases from building materials: The search for extended validity domain and parsimony

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Building Simulation 2021年第4期14卷 1277-1293页

作者： Lei Huang Alice Micolier henri p.gavin Olivier Jolliet Department of Environmental Health Sciences School of Public HealthUniversity of MichiganAnn ArborMIUSA I2M CNRSUMR 5295351 Cours de la LibérationUniversity of Bordeaux33400TalenceFrance Department of Civil and Environmental Engineering Duke UniversityDurhanNCUSA

This study aims to systematically evaluate and extend the validity domains of multiple mechanistic models of chemical emissions from building materials. We compare the validity domain of the analytical solution with four numerical solutions for a single layer material with one convective surface and a wide range of chemical properties, material thicknesses, and simulation time. We also develop a parsimonious simplified model, ensuring the widest possible validity domain with minimum simulation time. For diffusion coefficients lower than 10−15 m^(2)/s, accuracy of the analytical solution requires at least 5000 positive roots. The numerical method using uneven discretization and finite difference approximation for the boundary conditions is the best numerical solution. The parsimonious combined D- and K-limited model achieves similar accuracy as the best numerical solution except slight overestimates at the interface between the D- and K-limited zones, while having simpler computations and much shorter simulation time. These models show good agreement against experimental data. This study demonstrates that the complex analytical solution can be well approximated by a simpler model with a wide validity domain, enabling the high-throughput screenings of a large number of chemical-product combinations.

关键词： emission models building materials organic chemicals analytical solution numerical and simplified solutions high-throughput assessment

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