Orthogonal Collocation
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. A METHODOLOGY TO OBTAIN ANALYTICAL MODELS THAT REDUCE THE COMPUTATIONAL COMPLEXITY FACED IN REAL TIME IMPLEMENTATION OF NMPC CONTROLLERS
Abstract Model Predictive Control, MPC and NMPC, and real-time optimization, RTO and D-RTO, are known to help plant operability through the mitigation of impacts caused by external disturbances. However, the usage of these tools in industry requires overcoming some challenges, for instance: accurate models of the process, particularly in regard to nonlineari
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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2. HIGHLY-ACCURATE MODEL ORDER REDUCTION TECHNIQUE ON A DISCRETE DOMAIN
Abstract In this work, we present a highly-accurate technique of model order reduction applied to staged processes. The proposed method reduces the dimension of the original system based on null values of moment-weighted sums of heat and mass balance residuals on real stages. To compute these sums of weighted residuals, a discrete form of Gauss-Lobatto quadr
Braz. J. Chem. Eng.. Publicado em: 2015-09
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3. A modified orthogonal collocation method for reaction diffusion problems
A low-order collocation method is often useful in revealing the main features such as concentration and temperature profiles and the effectiveness factor for porous catalyst particles. Two modifications are introduced in this paper to make the method more efficient. The first modification is to add an extra collocation point at the center of the particle. It
Braz. J. Chem. Eng.. Publicado em: 2014-12
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4. Modelagem e simulação da secagem de frutos de café em um secador de bandejas vibradas
A Faculdade de Engenharia Química da Universidade Federal de Uberlândia vem desenvolvendo estudos de expressão na área de secagem dos frutos do café utilizando secador de bandejas vibradas com reciclo. Dentre os trabalhos desenvolvidos destaca-se o de Sfredo (2006), que fez o estudo da dispersão do fruto de café no secador descrito inicialmente. Os da
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/10/2011
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5. Modelling of displacement washing of packed bed of fibers
The mechanism of displacement washing of packed bed of porous, compressible and cylindrical particles, e.g., fibers, is presented with the help of an axial dispersion model involving Peclet number (Pe) and Biot number (Bi). Bulk fluid concentration, intra-pore solute concentration and concentration of solute adsorbed on the fiber surface are taken to be the
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
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6. Discretisation of the non-linear heat transfer equation for food freezing processes using orthogonal collocation on finite elements
The freezing process is considered as a propagation problem and mathematically classified as an "initial value problem." The mathematical formulation involves a complex situation of heat transfer with simultaneous changes of phase and abrupt variation in thermal properties. The objective of the present work is to solve the non-linear heat transfer equation f
Brazilian Journal of Chemical Engineering. Publicado em: 2007-09
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7. Soybean oil hydrogenation : modelling of kinetic in a loop reactor. / Hidrogenação de oleo de soja : modelagem da cinetica em um reator recirculação.
Os reatores de recirculação representam uma tecnologia alternativa muito atraente para o processo de hidrogenação, tecnologia esta ainda não totalmente desenvolvida para a hidrogenação de óleos vegetais. Os reatores convencionais utilizados no processo de hidrogenação possuem agitação mecânica, sistema de injeção de hidrogênio na base, e nece
Publicado em: 2007
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8. Concentration of alpha-lactalbumin from cow milk whey through expanded bed adsorption using a hydrophobic resin
The design of novel applications for the use of new high-density adsorbents in the direct recovery of proteins requires analysis of the fluid dynamics and mass transfer characteristics of the column used with the solid-liquid system. In this article we describe the operating parameters related to the use of a high-density, hydrophobic resin (Streamline® Phe
Brazilian Journal of Chemical Engineering. Publicado em: 2005-12
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9. Modelagem e otimização do processo de liofilização : aplicação para leite desnatado e cafe soluve
Freeze drying is a separation process based on the sublimation phenomenon. This process has the following advantages compared to the conventional drying process: the material structure is maintained, moisture is removed at low temperature (reduced transport rates), product stability during storage is increased, the fast transition from moisturized product to
Publicado em: 2004
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10. Modelagem e analise de digestores Kraft descontinuo
Global1y, the Kraft pulping process is beginning to get use of the benefits of the recent developments in the modeling area and process control. Advanced techniques of simulation and control offer tools that allow the analysis and efficient design of multivariable non-linear process, involving the optimization and the advanced control of the process. The pul
Publicado em: 2004
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11. Simultaneous optimization of dynamic bioprocesses
It is known that the optimal control may introduce significant economical benefits into production processes, thus being an important and challenging research area with practical relevance. The modeling and optimization of biotechnological processes has been object of research and their related results have generated improvements in operating conditions and
Brazilian Journal of Chemical Engineering. Publicado em: 2002-12
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12. Modelos hibridos de colunas de destilação
Techniques like online process optimization and model predictive control require fast simulations of the process models used. However, in some cases the process models are very complex or have a high dimension. In these cases acceleration techniques that include order reduction and model simplification can be used to obtain fast enough simulations. Distillat
Publicado em: 2002