Authors:
Graham C. Goodwin,
Tristan Pérez,
Maria M. Serón,
Ching-Yaw Tzeng,
Volume: 1, Page 4705 Paper number 1550
Abstract:
The main purpose of the rudder in ships is course keeping. However,
the rudder can also be used, in some cases, to reject undesirable wave
produced rolling motion. From a fundamental point of view, the main
issues associated with this problem are the presence of a non minimum
phase zero and the single input two output nature of the system. In
this paper, the limitations imposed on the achievable closed loop performance
due to these issues are analyzed. This gives a deeper understanding
of the problem and leads to conclusions regarding the inherent design
trade-offs which hold regardless of the control strategy used.
Authors:
Mauricio C. de Oliveira,
Robert E. Skelton,
Volume: 1, Page 4711 Paper number 1780
Abstract:
This paper provides necessary and sufficient conditions for mean-square
state-feedback stabilization of linear systems whose white noise sources
have intensities affinely related to the variance of the signal they
corrupt. System with such noise sources have been called FSN (finite
signal-to-noise) models, and the stability results provided in prior
work were only sufficient conditions. Upper bounded L_2 performance
is also guaranteed herein by solving a control problem which is nonconvex
only due to a certain scaling parameter. By fixing this parameter convex
programming algorithms provide controllers.
Authors:
Karine Blin,
Marianne Akian,
Frédéric Bonnans,
Eric Hoffman,
Karim Zeghal,
Volume: 1, Page 4717 Paper number 2111
Abstract:
This paper addresses the issue of conflict detection in the domain
of air traffic control. In a previous study investigating the position
error in conflict detection estimation, a comprehensive model has been
proposed and tuned with real data. Further steps are proposed in this
paper consisting firstly of investigating wind effects on aircraft
trajectory predictions. Secondly by providing a conflict estimation
approach that could be applied to aircraft trajectories with heading
and velocity changes. Finally, a time-based probabilistic approach
instead of position-based is proposed for predicting flight paths to
be navigated by existing FLight Management Systems (FMS).
Authors:
Marinho G. Andrade,
Marcelo D. Fragoso,
Adriano A. F. M. Carneiro,
Volume: 1, Page 4723 Paper number 2022
Abstract:
We propose a stochastic model in conjunction with reliability analysis
concepts to improve estimates for the protection volume that should
be allocated in a reservoir to control a flood wave. In this approach,
the inflow that reaches the reservoir during a flood is considered
to be a load, and the reservoir capacity to control this flood is considered
to be the resistance that the reservoir offers against the propagation
of the flood. Here, the load and the resistance are modeled as a diffusion
stochastic process, and the protection volume is determined via Ito
formula. In this scenario, an explicit formula for the failure risk
is derived. The parameter inference is carried out by a Bayesian approach
for a time discrete version of the load, and the estimates are obtained
by using Monte Carlo Markov Chain Algorithms (MCMC). The maximum likelihood
estimators are used in the comparison. The record utilized comprises
nine years of daily inflow rates during flood periods that come to
the Chavantes Hydroelectric Power Plant (CHPP) in Southeast Brazil.
The protection volumes estimated through the proposed model are compared
to the volumes obtained by other existing methods.
Authors:
Felisa J. Vázquez-Abad,
Lourdes Zubieta,
Volume: 1, Page 4729 Paper number 1766
Abstract:
We propose to build an intelligent mechanism within a computerized
subway system that will adjust frequency of services according to the
observed variable demand. Operating costs and social cost are taken.
The proposed transit system automatically seeks optimal performance
minimizing operational costs. The structure of the control variables
(headways) and their relationship with other model parameters make
the problem suitable for ersatz estimation, which uses surrogate (local)
information to reconstruct gradient estimation.
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