Minimization of Acoustic Radiation from a Turbulent Boundary Layer Excited Panel with Curvilinear Stiffeners

Abstract

Present work addresses the structural-acoustic design optimization study of straight or curvilinearly sti ened panels excited by turbulent boundary layer (TBL) pressure uctuation. The Corcos and the Smol’yakov and Tkachenko models of representing TBL are used to capture correlation of TBL pressure excitation. Validation of the Corcos and the Smol’yakov and Tkachenko TBL models, implemented in a framework, named EBF3PanelOpt are performed using fast multi-pole boundary element method in FastBEM and a conventional boundary element code, HELM3D. The reduction of mass and the acoustic response during structural-acoustic optimization are con icting in nature. Therefore, a multiobjective design optimization using nondominated sorting genetic algorithm-II (NSGA-II) in VisualDoc is performed. The best pareto optimal design, obtained using multi-objective design optimization approach has reduced the acoustic response and the mass of the structure signi cantly when compared to a baseline design while meeting all the constraint such as buckling eigenvalue, von Mises and crippling stresses.