Constrained Systems
Mostrando 1-12 de 88 artigos, teses e dissertações.
-
1. Sociedade civil, partidos políticos e inter-relações: um estudo comparativo entre Porto Alegre e Montevidéu
Este artigo tem o propósito de realizar um estudo comparativo entre o orçamento participativo de Porto Alegre e a descentralização participativa de Montevidéu, tendo como centro analítico o papel desempenhado pelos sistemas político-partidários nos dois países. Nesse sentido, a investigação pretende oferecer elementos que auxiliem a responder à s
Opin. Publica. Publicado em: 16/05/2019
-
2. Releasing systems for aerospace industry based upon Shape Memory Alloys: characterization of materials for actuators
ABSTRACT Releasing and deployment maneuvers carried out during space satellites launching are usually performed by utilizing pyrotechnics loads. However, it is considered convenient to replace this technique by others not requiring explosives (Non Explosive Actuators-NEA). This is mainly due to the necessity of reducing high-shock and vibrations induced leve
Matéria (Rio J.). Publicado em: 19/07/2018
-
3. Design Optimization of a Random Suspension Device Considering a Reliability Constraint on the Frequency Response Function
Abstract This work deals with the design of a suspension device, idealized as a spring-mass-damper system. The amplitude of a nominal system is constrained to satisfy certain limitations in a given frequency band and the design is to be done as a reliability-based optimization. This constitutes a major difficulty since the constraint becomes a random process
Lat. Am. j. solids struct.. Publicado em: 2016-06
-
4. State estimation of chemical engineering systems tending to multiple solutions
A well-evaluated state covariance matrix avoids error propagation due to divergence issues and, thereby, it is crucial for a successful state estimator design. In this paper we investigate the performance of the state covariance matrices used in three unconstrained Extended Kalman Filter (EKF) formulations and one constrained EKF formulation (CEKF). As bench
Braz. J. Chem. Eng.. Publicado em: 2014-09
-
5. Decomposition approach for generation and transmission expansion planning with implicit multipliers evaluation
In an electric power systems planning framework, decomposition techniques are usually applied to separate investment and operation subproblems to take benefits from the use of independent solution algorithms. Real power systems planning problems can be rather complex and their detailed representation often leads to greater effort to solve the operation subpr
Pesqui. Oper.. Publicado em: 08/11/2013
-
6. Simulation of multiple reservoirs sharing constrained surface facilities using integrated production modelling / Simulação de múltiplos reservatórios em cenário com restrição de superfície utilizando modelagem integrada de produção
The selection of production strategies for petroleum field development is an important task. The specific case in which there are constrained surface facilities, the allocation of production and injection well rates is one more item to be optimized. When the problem involves several segregated reservoir units, each of which characterized by its own geologica
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/05/2012
-
7. Diagnostic methods in sepsis: the need of speed
OBJECTIVE: Sepsis is a common condition encountered in hospital environments. There is no effective treatment for sepsis, and it remains an important cause of death at intensive care units. This study aimed to discuss some methods that are available in clinics, and tests that have been recently developed for the diagnosis of sepsis. METHODS: A systematic rev
Revista da Associação Médica Brasileira. Publicado em: 2012-08
-
8. Bézier control points method to solve constrained quadratic optimal control of time varying linear systems
A computational method based on Bézier control points is presented to solve optimal control problems governed by time varying linear dynamical systems subject to terminal state equality constraints and state inequality constraints. The method approximates each of the system state variables and each of the control variables by a Bézier curve of unknown cont
Comput. Appl. Math.. Publicado em: 2012
-
9. A filled function method for nonlinear systems of equalities and inequalities
In this paper a filled function method is suggested for solving nonlinear systems of equalities and inequalities. Firstly, the original problem is reformulated into an equivalent constrained global optimization problem. Subsequently, a new filled function with one parameter is constructed based on the special characteristics of the reformulated optimization
Comput. Appl. Math.. Publicado em: 2012
-
10. Maximum profit cogeneration plant - MPCP: system modeling, optimization problem formulation, and solution
The well-known CGAM optimization problem was formulated to serve as a benchmark for comparison of different thermoeconomic methodologies. The CGAM cogeneration plant produced 30 MW of power and 14 kg/s of saturated vapor at 20 bar. The objective function was the total cost rate of the system, related to thermodynamic variables and installation costs. Because
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-03
-
11. Dynamic output feedback for discrete-time systems under amplitude and rate actuator constraints
This work proposes a technique for the design of stabilizing dynamic output feedback controllers for discrete-time linear systems with rate and amplitude saturating actuators. The nonlinear effects introduced by the saturations in the closed-loop system are taken into account by using a generalized sector condition, which leads to theoretical conditions for
Publicado em: 2011
-
12. Local stabilization of linear systems under amplitude and rate saturating actuators
This note addresses the problem of local stabilization of linear systems subject to control amplitude and rate saturation. Considering the actuator represented by a first-order system subject to input and state saturation, a condition for the stabilization of an a priori given set of admissible initial states is formulated from certain saturation nonlinearit
Publicado em: 2011