Author(s)

H. Martikka

Abstract

Computer Aided Optimum Design of Structures 119 Optimum design of heavy machinery beams using shape, material and manufacturing method selections with fuzzy satisfaction goals H. Martikka Faculty of Construction Design, Department of Mechanical Engineering Lappeenranta University of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland Email: heikki.martikka@lut.fi Abstract The main purpose of this study is to present the results of a project for optimum design of a large paper machinery beam needed to transmit reliably the load cycle forces. The following methods are used. First, the work cycle loads are obtained from production process data. Then FEM is used to optimize the structure with a mass minimization goal and with constraints on deflections, stresses and buckling. An analytical optimization method is used in which the goals are formulated in a fuzzy way to maximize the satisfaction of the customer on the cost of the beam material, the c

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