Space-harmonic analysis of input power flow in a periodically stiffened shell filled with fluid

In this paper, the input power flow from a cosine harmonic circumferential line force into an infinite cylindrical fluid-filled shell with periodic st iffeners is studied. The stiffeners are idealized as line attachments capab le of exerting line forces which relate to the stiffeners and the shell. Th e motion of the shell and the pressure field in the contained fluid are des cribed by the Flugge thin shell theory and the Helmholt equation respective ly. A periodic structure theory, space-harmonic analysis, is used to invest igate this fluid-filled periodic structure. The concept of the vibrational power flow is introduced and the influence of the parameters of the stiffen ers upon the results is also discussed. (C) 1999 Academic Press.