1. Viscoelastic Damping And Piezo-Electric Control Of Structures Subjected To Aerodynamic Noise - Cristina E. Beldica,Harry H. Hilton,Sung Yi
Analytical and numerical simulations are carried out in order to identify physical parameters a#ecting acoustic and motion control by viscoelastic piezo-electric and material damping. Numerical simulations in terms of critical parameters, such as relaxation functions of the structure and piezo-electric devices, aerodynamic coe#cients, Mach number, are carried out to evaluate their sensitivity to system responses, sensing and structural control. 1 INTRODUCTION Aerodynamic noise, i. e. flow generated acoustical disturbances in skin panels, ducts, combustors, helicopter and turbine blades, etc., is ever present in flight vehicles and may lead to breaches in structural integrity as well as crew and passenger discomfort. While e#cient aerodynamic design may lead to some noise...
(pdf) - 31-mar-2009