Noise transmission into semicylindrical enclosures through discretely stiffened curved panels

An analytical study of sound transmission into semicylindrical enclosures through discretely stiffened curved elastic panels is presented. The transmitted sound is estimated by solving the acoustic wave equation for the interior acoustic field, a Galerkin-like method being used. This solution is then coupled to the vibration of the stiffened panels. The response characteristics of these panels are determined by using a modal analysis where the modes are obtained by the finite element-strip method. Numerical results include spectra of the interior sound pressure due to white noise, turbulent boundary layer and propeller noise inputs.

[1]  Y. K. Lin,et al.  A BRIEF SURVEY OF TRANSFER MATRIX TECHNIQUES WITH SPECIAL REFERENCE TO THE ANALYSIS OF AIRCRAFT PANELS , 1969 .

[2]  S. Parthan,et al.  Effects of in-plane and rotary inertia on the frequencies of eccentrically stiffened cylindrical shells , 1970 .

[3]  Earl H. Dowell,et al.  Absorption material mounted on a moving wall—Fluid/wall boundary condition , 1981 .

[4]  Mo Shing Cheung,et al.  Vibration analysis of cylindrical panels , 1972 .

[5]  S. Ghosh,et al.  Theory of thin walled bars: Atle Gjelsvik, Wiley-Interscience, New York, 1981. ISBN 0-471-08594-4, ix + 248 pages, illustrated, hard cover £22.00 , 1982 .

[6]  Rimas Vaicaitis,et al.  Investigation of Interior Noise in a Twin-Engine Light Aircraft , 1978 .

[7]  Leslie Robert Koval,et al.  Effect of air flow, panel curvature, and internal pressurization on field‐incidence transmission loss , 1976 .

[8]  Leslie Robert Koval,et al.  On sound transmission into a stiffened cylindrical shell with rings and stringers treated as discrete elements , 1980 .

[9]  B M Brooks,et al.  ADVANCED TURBO-PROP AIRPLANE INTERIOR NOISE REDUCTION-SOURCE DEFINITION , 1979 .

[10]  E. Dowell,et al.  Acoustoelasticity - General theory, acoustic natural modes and forced response to sinusoidal excitation, including comparisons with experiment , 1977 .

[11]  Thein Wah,et al.  Vibration Analysis of Stiffened Cylinders including Inter‐Ring Motion , 1968 .

[12]  L. R. Koval,et al.  Analytical study of interior noise control by fuselage design techniques on high-speed, propeller-driven aircraft , 1980 .

[13]  Yu-Kweng Michael Lin.  Probabilistic Theory of Structural Dynamics , 1976 .

[14]  T. J. McDaniel,et al.  The analysis of curved multi-span structures , 1971 .

[15]  Hans H. Bleich,et al.  Buckling strength of metal structures , 1952 .

[16]  M. K. Au-Yang,et al.  Random response of rectangular panels to the pressure field beneath a turbulent boundary layer in subsonic flows , 1972 .

[17]  James A Cockburn,et al.  STRUCTURAL-ACOUSTIC RESPONSE, NOISE TRANSMISSION LOSSES AND INTERIOR NOISE LEVELS OF AN AIRCRAFT FUSELAGE EXCITED BY RANDOM PRESSURE FIELDS , 1968 .

[18]  Leslie Robert Koval,et al.  On sound transmission into a thin cylindrical shell under “flight conditions” , 1976 .