A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Optimum design of welded machinery beams using shape, material and manufacturing method selections with fuzzy satisfaction goals
The main purpose of this study is optimum weld joint and total design of large paper machinery beam constructions 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 mass minimization goal and with constraints on deflections, stresses and buckling. Analytical optimization method is used and the goals are formulated in a fuzzy way to maximize the satisfaction of the customer on the cost of the beam material, the cost of the weld manufacturing and on fatigue life. Constraints are included on stress, deflection and buckling. An optimization algorithm is used with a mix of discrete and continuous variables of component geometries, materials and manufacturing. The following results are obtained. Use of FEM optimization results in a structure with minimum mass at optimum plate thicknesses satisfying the constraints. Optimal choices of weld material, welding method and weld sized are obtained. The analytic method gives nearly the same main optimum design results. It is advantageous to use these global and local methods interactively to check the designs.
Optimum design of welded machinery beams using shape, material and manufacturing method selections with fuzzy satisfaction goals
The main purpose of this study is optimum weld joint and total design of large paper machinery beam constructions 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 mass minimization goal and with constraints on deflections, stresses and buckling. Analytical optimization method is used and the goals are formulated in a fuzzy way to maximize the satisfaction of the customer on the cost of the beam material, the cost of the weld manufacturing and on fatigue life. Constraints are included on stress, deflection and buckling. An optimization algorithm is used with a mix of discrete and continuous variables of component geometries, materials and manufacturing. The following results are obtained. Use of FEM optimization results in a structure with minimum mass at optimum plate thicknesses satisfying the constraints. Optimal choices of weld material, welding method and weld sized are obtained. The analytic method gives nearly the same main optimum design results. It is advantageous to use these global and local methods interactively to check the designs.
Optimum design of welded machinery beams using shape, material and manufacturing method selections with fuzzy satisfaction goals
Optimalentwurf von geschweißten Maschinenträgern durch Auswahl von Form, Werkstoff und Fertigungsverfahren mit Fuzzy-Zielfunktionen
Martikka, H.I. (author)
1999
10 Seiten, 8 Bilder, 3 Tabellen, 5 Quellen
Conference paper
English
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