Genetic Algorithm steady-state

Selecting the Optimum Quasi-Steady-State Species for Reduced Chemical Kinetic Mechanisms using a Genetic Algorithm. 

Multi-objective optimization procedures were used for the simultaneous maximization of monomer conversion and minimization of side products during low-density polyethylene polymerizations performed in tubular reactors under steady-state conditions [170]. Genetic algorithms were used to compute the Pareto sets. Multi-objective optimization procedures were also used for the simultaneous maximization of molecular weight averages and minimization of batch times in epoxy semibatch polymerizations [171]. In this case, monomer feed rates were used as the manipulated variable. 

In control situations, equation (9) is reduced to just one discrete point, controlled variable. In this case the objective function set the perturbation, as well as the non-controlled variables, and the genetic algorithm predictive control is performed. Table 4 presents a series of simulations, for some common perturbations, and presents the new calculated values for the manipulated variable. The references values used for these calculations are t those presented prior to the steady state optimisation. The controlled variable is the temperature, while the manipulated is the fuel. 

In the first step a random population is being initialized. In the second, using a chosen selection scheme, a specific number of individuals is randomly selected to the temporary population. Then the genetic operators such as cross-over and mutation are working on the temporary population. In the next step a new population is established. It consists of base and temporary population best individuals. The algorithm s iterations is repeated until the termination condition is met (a certain number of iterations in this instance). Presented algorithm is a steady-state type. 

Montgomery, C.J., Yang, C., Parkinson, A.R., Chen, J.-Y. Selecting the optimum quasi-steady-state species for reduced chemical kinetic mechanisms using a genetic algorithm. Combust Elame 144, 37-52 (2006)... 

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