Design of Perforated Shell Dryings Drums
- Heikki Martikka
- Erkki Taitokari
AbstractIn this study the results of optimum design of perforated cylindrical shell dryings drums are considered. These drums are used for pressurised drying of wet mass. They are important also in filter technology in macro, micro and nanoscales. The goal is formulated as maximisation of customer satisfaction on the most important decision variables. These are the fatigue endurance measured by crack propagation life, rate of water removal from mass through holes, risk of crack initiation and total cost. For perforated cylinders and plates basic engineering models are developed to get loads on the drum and to get equivalent material models to be used cost effectively in FEM. The validity of the surrogate models is tested using detailed FEM models. The results give a reasonable trade-off between many contradictory requirements. One optimal geometry is obtained and the softer steel is preferable due to better fatigue endurance and lower costs. Different surrogate models apply for static and dynamic loading.
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