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Composite structures with the shell-like geometry must provide the sufficient mechanical stiffness in order to eliminate the unwanted deformations caused by the action of airflow. Because the pressure field on the design surface caused by airflow is generally uniform, the ensuring of the necessary stiffness can be achieved by creating a nonuniform thickness along the shell surface. In the present study the CFD finite element analysis of the virtual wind-tunnel test for the studied composite shell is performed assuming its absolute stiffness. The problem is further parameterized by the introduction of the auxiliary sphere, which causes a smooth distribution function of the shell thickness. The optimum seeking is performed by means of the four parameter variation of this function, providing a minimum total energy of the shell deformation under the given restrictions on its weight.
CFD simulation, composite structures, lay-up design, structural optimization
[1] Ostergaard, M.G., Ibbotson, A.R., Le Roux, O. & Prior, A.M., Virtual testing of aircraft structures. CEAS Aeronautical Journal, 1, pp. 83–103, 2011. http://dx.doi.org/10.1007/s13272-011-0004-x
[2] Zhou, M., Fleury, R. & Kemp, M., Optimization of composite: recent advances and application, available at: www.altairproductdesign.com, p. 14, 2011.
[3] Rao, J.S., Advances in aero structures. ICOVP-2015 Conference Proceedings, Guwahati, India, p. 20, 2015.
[4] Jones, R.M., Mechanics of Composite Materials, Taylor & Francis, Inc.: Philadelphia, 1998.
[5] Staab, G.H., Laminar Composites, Butterworth-Heinemann: Wobum, MA, 1999.
[6] Baker, A., Dutton, S. & Kelly, D., Composite Materials for Aircraft Structures, AIAA Eds.: Virginia, 2004.
[7] Meske, R., Sauter, J. & Zeynel, G., Recent improvements in topology and shape optimization and the integration into the virtual product development process. Advances in Shape and Topology Optimization, Proceedings of International Workshop, p. 12, 2008.
[8] Thomas, H.L., Zhou, M., Shyy, Y.K. & Pagaldipti, N., Practical aspects of commercial composite topology optimization software development. Topology Optimization of Structures and Composite Continua, ed. G.I.N. Rozvany & N. Olhoff, Kluver Academic Publishers: Dordrecht, Boston, London, pp. 269–278, 2000. http://dx.doi.org/10.1007/978-94-010-0910-2_19
[9] Guillermin, O., Computer-aided design and manufacturing. Composites ASM Handbook, 21, pp. 883–899, 2001.
[10] Vosniakos, G.C., Maroulis, T. & Pantelis, D., A method for optimizing process parameters in layer-based rapid prototyping. Proceeding of the Institution of Mechanical Engineering, Part B: Journal of Engineering Manufacture, 221, pp. 1329–1340, 2007. http://dx.doi.org/10.1243/09544054JEM815
[11] Querin, O.M., Steven, G.P. & Xie, Y.M., Advances in evolutionary structural optimization: 1992-2000. Topology Optimization of Structures and Composite Continua, eds G.I.N. Rozvany & N. Olhoff, Kluver Academic Publishers: Dordrecht, Boston, London,pp. 227–236, 2000.
[12] Bendsoe, M.P. & Sigmund, O., Topology Optimization. Theory, Methods and Applications, 2nd edn., Springer: Berlin, p. 370, 2004.
[13] Huang, X. & Xie, Y.M., Evolutionary Topology Optimization of Continuum Structures: Methods and Applications, John Wiley &Sons: Chichester, UK, p. 220, 2010. http://dx.doi.org/10.1002/9780470689486
[14] Taylor, J.E., A formulation for optimal structural design with optimal materials. Topology Optimization of Structures and Composite Continua, eds G.I. Rozvany & N. Olhoff, Kluver Academic Publishers: Dordrecht, Boston, London, pp. 49–55, 2000. http://dx.doi.org/10.1007/978-94-010-0910-2_4
[15] Oganesyan, P., Zhilyaev, I., Shevtsov, S. & Wu, J.-K., Optimized design of the wind turbine’s composite blade to flatten the stress distribution in the mounting areas. The Latest Methods of Construction Design, eds by V. Dynybyl, O. Berka, K. Petr, F. Lopot & M. Dub, Springer: Switzerland, pp. 335–341, 2015
[16] Wilkes, J.O., Fluid Mechanics for Chemical Engineers with Microfluidics and CFD, 2nd edn., Prentice Hall International Series in the Physical and Chemical Engineering Sciences: Westford, MA, p. 754, 2012.