Aerospace Knowledge and Technology Journal

Aerospace Knowledge and Technology Journal

Investigation of acoustic wave scattering behavior of a functionally graded viscoelastic cylindrical shell with ring and stringer stiffeners in the presence of subsonic flow

Document Type : Research Paper

Authors
Tohid Mardaneh 1
Ali Tarkashvand 1
Mahmood Raeiszadekooshkghazi 2
Kamran Daneshjou 3
1 دانشجو
2 iran university of science and technology
3 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
Abstract
In this paper, the acoustic scattering of an infinitely long functionally graded viscoelastic cylinder, reinforced with ring and stringer stiffeners and excited by an oblique acoustic wave, is investigated. The cylinder is made of functionally graded viscoelastic material, and its properties vary along the radial direction according to a power law distribution. The ring and stringer stiffeners are located on the outer surface of the shell. First-order shear deformation theory based on Hamilton's principle is used to derive the shell’s motion equations. The ring and stringer stiffeners are coupled with the shell as force and moment resultants. Then, using structure–fluid interaction equations, the acoustic vibration equations of the structure are obtained. Finally, the effects of geometrical, mechanical, and physical parameters on acoustic scattering are investigated. The results show that changes in the thickness, width, and spacing of the stiffeners have a significant effect on the acoustic scattering of the structure.
Keywords
Vibroacoustic
acoustic scattering
functionally graded viscoelastic materials
stiffeners
first-order shear deformation theory
Subjects