Optimization Under Uncertainty
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Multidisciplinary Design Optimization of UAV Under Uncertainty
ABSTRACT: Uncertainty-based multidisciplinary design optimization considers probabilistic variables and parameters and provides an approach to account for sources of uncertainty in design optimization. The aim of this study was to apply a decoupling uncertainty-based multidisciplinary design optimization method without any dependence on probability mathemati
J. Aerosp. Technol. Manag.. Publicado em: 2017-06
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2. Robust Optimal Adaptive Trajectory Tracking Control of Quadrotor Helicopter
Abstract This paper focuses on robust optimal adaptive control strategy to deal with tracking problem of a quadrotor unmanned aerial vehicle (UAV) in presence of parametric uncertainties, actuator amplitude constraints, and unknown time-varying external disturbances. First, Lyapunov-based indirect adaptive controller optimized by particle swarm optimization
Lat. Am. j. solids struct.. Publicado em: 2017-06
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3. Optimizing short-term production plan using a portfolio optimization model
Abstract Short-term production plans are the basis for operational mine production schedules. They concentrate on making long-term mine plans operationally feasible. It ensures a steady flow of product for meeting blending targets. Due to the quality variation of material, blend optimization is an uncertainty based optimization problem. There are different a
REM, Int. Eng. J.. Publicado em: 2017-03
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4. Joint optimization of new production, warranty servicing strategy and secondary market supply under consumer returns
In this paper, we consider an OEM selling new products to the market offering (i) a warranty period during which defective units are dealt with at no cost for the customer, and (ii) a full refund to customers who return products that do not meet their expectations (consumer returns). The manufacturer has different options for satisfying the warranty cases as
Pesqui. Oper.. Publicado em: 2013-12
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5. Long-term planning of a container terminal under demand uncertainty and economies of scale
Governments of many developing countries are presently granting concessions to private organizations to operate container terminals. A key element in this process is the technical and economic evaluation of the project. In practice, the demand levels over time are volatile. The first part of the paper deals with a capacity expansion problem with stochastic d
Pesquisa Operacional. Publicado em: 03/04/2012
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6. An overview of flexibility and generalized uncertainty in optimization
Two new powerful mathematical languages, fuzzy set theory and possibility theory, have led to two optimization types that explicitly incorporate data whose values are not real-valued nor probabilistic: 1) flexible optimization and 2) optimization under generalized uncertainty. Our aim is to make clear what these two types are, make distinctions, and show how
Comput. Appl. Math.. Publicado em: 2012
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7. Control of uncertainties within an interdisciplinary design approach of a robust high heel
Within this paper the combination of several methods, developed and used in Collaborative Research Center (CRC) 805 - "Control of Uncertainties in Load Carrying Systems in Mechanical Engineering" of the DFG (German Research Foundation), is used to demonstrate the development of a load carrying system under uncertainty. The development starts with the identif
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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8. Simultaneous buckling and fundamental frequency optimization of frames under uncertain loadings
This work presents the optimization of a frame under uncertain loadings when two design criteria are taken simultaneously into account. The uncertainty relates to the applied loading and is inherent to the operation of structures since real structures are designed to sustain a large variety of load cases of practical relevance. The design criteria considered
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-03
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9. On the effects of uncertainty on optimum structural design / Estudo do efeito de incertezas na otimização estrutural
In this study the effects of uncertainty on optimum structural design are investigated, by comparing three distinct formulations of a structural optimization problem. Such effects can be quantified in terms of failure probabilities and risk, or expected costs of failure. Deterministic Design Optimization (DDO) allows one the find the shape or configuration o
Publicado em: 2010
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10. OTIMIZAÇÃO DOS DISPÊNDIOS DE PUBLICIDADE SOB INCERTEZA DOS CICLOS ECONÔMICOS / ADVERTISING EXPENDITURES OPTIMIZATION UNDER BUSINESS CYCLES UNCERTAINTY
Este estudo tem como objetivo principal verificar a contribuição dos dispêndios em publicidade no valor da empresa a partir de um modelo dinâmico e estocástico. O efeito dinâmico capta os impactos dos dispêndios de publicidade na geração de caixa em períodos subseqüentes. O efeito estocástico reflete a incerteza dos ciclos econômicos que influen
Publicado em: 2009
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11. OPTIMAL PRICING OF NATURAL GAS FLEXIBLE CONTRACTS / PRECIFICAÇÃO ÓTIMA DOS CONTRATOS DE GÁS NATURAL NA MODALIDADE INTERRUPTÍVEL
O segmento industrial desempenha um importante papel no desenvolvimento do setor de gás Brasileiro. Em função dos baixos preços e dos incentivos dados pelo governo para a conversão dos processos industriais (muitos deles dependentes do óleo combustível) para o gás natural, criou-se uma fonte de demanda firme deste combustível. Como as termelétricas
Publicado em: 2009
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12. Methodology of production strategy optimization based on genetic algorithms / Metodologia de otimização probabilistica de estrategias de produção baseada em algoritmos geneticos
High levels of uncertainty and associated risks in the exploration and production of some oil fields suggest the use of probabilistic optimized production strategies. Therefore, an appropriate production strategy should be chosen considering various geological and economic scenarios. In this work, a new approach for the optimization is proposed where the pro
Publicado em: 2008