Optimization Of Ring Stiffener Of A Missile
Journal: International Journal of Scientific & Technology Research (Vol.3, No. 3)Publication Date: 2014-03-15
Authors : Sheikh Naunehal Ahamed; Mohammed Mushraffuddin;
Page : 217-264
Keywords : Index Terms circumferential nodes; hoops stress; mesh; resonance; topology optimization; von misses stress;
Abstract
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 removalshifting 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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