Accession Number : AD0624442

Title :   THE EFFECT OF STRUCTURAL DAMPING ON THE ACOUSTICAL FIELD SURROUNDING A SUBMERGED VIBRATING SANDWICH SHELL,

Corporate Author : APPLIED TECHNOLOGY ASSOCIATES INC RAMSEY N J

Personal Author(s) : Jones,I. W. ; Salerno,V. L.

Report Date : SEP 1965

Pagination or Media Count : 38

Abstract : This report utilizes the damped sandwich shell theory developed by the authors in a previous paper as a basis for a study of the behavior of a damped sandwich cylinder vibrating symmetrically while submerged in an infinite fluid medium. The influences of 'added mass' and hydrodynamic damping as well as structural damping on both the radial motion of the shell and, more importantly, on the sound pressure level in the medium are included in the equations. These phenomena are then examined quantitatively in numerical examples. It is shown that the pressure in the medium due to vibration in axisymmetric modes can be reduced by the use of a damped sandwich shell rather than a homogeneous shell of the same weight. (Author)

Descriptors :   (*SHELLS(STRUCTURAL FORMS), VIBRATION), (*UNDERWATER SOUND, STRUCTURAL SHELL), (*DAMPING, UNDERWATER SOUND), EQUATIONS OF MOTION, PARTIAL, SANDWICH CONSTRUCTION

Subject Categories : Marine Engineering
      Acoustics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE