Development and verification of a MATLAB driver for the SNOPT optimization software

The Flamelet Generated Manifold (FGM) model requires a reaction progress variable which is usually defined as a weighted sum of species mass fractions. This progress variable should increase monotonically as flamelet states progress from unburnt to chemical equilibrium. A favorable attribute of the progress variable is that the flamelet species should change gradually with the progress variable, which reduces sensitivity of these species to any predicted errors in the progress variable. Previous publications have presented optimization algorithms for specific flamelet operating conditions, including fuel and oxidizer compositions and temperatures, and pressures. This work applies the HEEDS optimization software to find optimal species weights for a range of fuels and operating conditions. The fuels included are methane, methane-hydrogen, n-dodecane and n-heptane, at fuel-oxidizer temperatures of 293K and 1000K, and pressures of 1 and 30 atmospheres. For manifolds modeled by constant pressure ignition reactors, the optimal progress variable weights using four species weights are {αCO2 = 1, αCO = 0.91, αH2O = 0.52, αH2 = 1}, and for eight species weights are {αCO2 = 1, αCO = 0.91, αH2O = 0.51, αH2 = 1, αC2H2 = 0.16, αOH = −0.66, αH = −0.38, αO = 0.4}.

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MODELAGEM, SIMULAÇÃO E OTIMIZAÇÃO DA DINÂMICA OPERACIONAL DO PROCESSO DE ATENDIMENTO DE UM PEQUENO POSTO DE SAÚDE

e-xacta ◽

10.18674/exacta.v6i1.971 ◽

2013 ◽

Vol 6 (1) ◽

pp. 101

Author(s):

José Airton Azevedo dos Santos ◽

Tiago C. Dal’sotto ◽

Wesley Schroeder

Keyword(s):

Computer Simulation ◽

Appointment Scheduling ◽

Quantitative Character ◽

Health Post ◽

Waiting Room ◽

Optimization Software ◽

Simulation And Optimization ◽

Medical Appointment ◽

West Region ◽

Simulation Package

Este trabalho tem como objetivo analisar, através de técnicas de simulação e de otimização, a dinâmica operacional do processo de atendimento de um pequeno posto de saúde localizado na região oeste paranaense. A simulação e a otimização foram executadas utilizando o pacote de simulação Arena®, que inclui o software de otimização Optquest. A metodologia utilizada é a de modelagem através de simulação computacional, de caráter quantitativo e é caracterizada como participativa. A aplicação destas técnicas em conjunto resultaram na otimização do número de agendamento de consultas médicas do posto de saúde.AbstractThis work aims to analyze the attending process operational dynamics of a small health post located in Paraná West Region. Another objective is connect the concepts of simulation and optimization to maximize the number of scheduling appointments for the health post, within the limits of accommodation of the waiting room. The simulation and optimization were performed using the Arena ® simulation package, which includes the OptQuest optimization software. The methodology used was the modeling through computer simulation of quantitative character and it is characterized as participative. The application of these techniques all together resulted in the optimization of the number of medical appointment scheduling of the health post

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A PRACTICAL PERFORMANCE INDEX FOR COMPARING OF OPTIMIZATION SOFTWARE

International Journal of Computing ◽

10.47839/ijc.2.1.156 ◽

2014 ◽

pp. 7-12

Author(s):

Andrea Attanasio ◽

Patrizia Beraldi ◽

Francesca Guerriero

Keyword(s):

Numerical Methods ◽

Performance Index ◽

Relative Efficiency ◽

Numerical Results ◽

Optimization Software ◽

Practical Performance

In this paper we propose a new practical performance index for ranking of numerical methods. This index may be very helpful especially when several methods are tested on a large number of instances, since it provides a concise and precise idea of the relative efficiency of a method with the respect to the others. In order to evaluate the efficiency of the proposed rule, we have applied it to the numerical results presented on previously published papers.

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Time Coordination of Periodic Passenger Train Connections in Conditions of Single-Track Lines

Mathematical Problems in Engineering ◽

10.1155/2021/3876561 ◽

2021 ◽

Vol 2021 ◽

pp. 1-17

Author(s):

Filip Lorenz ◽

Vit Janos ◽

Dusan Teichmann ◽

Michal Dorda

Keyword(s):

Mathematical Model ◽

Mathematical Programming ◽

Real Data ◽

Real Problem ◽

Single Track ◽

Railway Stations ◽

Optimization Software ◽

Proposed Model ◽

The Individual ◽

The Given

The article addresses creation of a mathematical model for a real problem regarding time coordination of periodic train connections operated on single-track lines. The individual train connections are dispatched with a predefined tact, and their arrivals at and departures to predefined railway stations (transfer nodes) need to be coordinated one another. In addition, because the train connections are operated on single-track lines, trains that pass each other in a predefined railway stations must be also coordinated. To optimize the process, mathematical programming methods are used. The presented article includes a mathematical model of the given task, and the proposed model is tested with real data. The calculation experiments were implemented using optimization software Xpress-IVE.

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