engleski

Design Optimization with GA Fitness Functions based on Total Lifecycle Value or Cost

The decision making process in multicriterial optimization problems is in many cases based on the a-priori articulation of the compromise integral criterion based on preferences which are frequently of rather intuitive nature. This reduces the comprehensive search for the Pareto front to simpler single-criterion optimization. In this paper, this approach is followed in a specific manner. Instead of the rather arbitrary setting of weight factors in a weighted sum of partial objectives, or compromise selection using the min-max concept related to distance to utopia optima, a lifetime-cost-based integral criterion is used. The GA fitness function is based on the total-lifespan-value aggregate optimality criterion. All nonrecurring investment costs (eg. production costs, mass of material) and recurring operational expenses (maintenance, labour) are discounted accordingly and aggregated into a combined best-compromise fitness metric based on the net present value (NPV) and/or internal rate of return (IRR), which construct the overall fitness function. This approach allows for coupled engineering & financial optimization which approximates real-world decision making.

GA design optimization; total lifespan cost; a-priori compromise formulation

Prihvaćen za objavljivanje na kongresu i časopisu.