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IJSTR >> Volume 3- Issue 3, March 2014 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Optimization Of Ring Stiffener Of A Missile

[Full Text]



Sheikh Naunehal Ahamed, Mohammed Mushraffuddin



Index Terms: circumferential nodes, hoop’s stress, mesh, resonance, topology optimization, von misses stress



Abstract: In general thick cylindrical structures have radial, axial, circumferential and extensional modes and some of these free vibrational modes exists within the machine operating frequency range and can lead to potential resonance. One way to avoid the resonance is to shift the system natural frequencies away from the machine operating range. In case of turbo-generators the forcing function, which is combination of various deformation stresses that deforms the structure into an oval shape. Our research explains how to shift oval mode frequencies using topology optimization scheme in the context of a finite element (FE) approach. The key challenge involved in FE is that one should be able to retain the mode of interest throughout the cycle of optimization. During the optimization scheme, there will be a progressive change in the geometry and material, which may cause removal/shifting of the mode of interest. The optimization is carried out using conventional artificial boundary condition of a missile ring stiffeners oval mode.



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