Effect of Longitudinal Stringers on Sound Transmission into a Thin Cylindrical Shell
In the context of the transmission of airborne noise into an aircraft fuselage, a mathematical model is presented fore the transmission of airborne noise into a stiffened cylindrical shell. The stiffeners are longitudinal stringers and are modeled as discrete structural elements. The numerical cases examined were typical of a narrow-bodied jet transport fuselage. The stringers appeared to raise the cylindrical transmission loss in the mass-controlled region, although they produced dips at the stringer resonances. The ring-frequency dip in transmission loss, which is characteristic of monocoque shells, was found to still be present. There appeared to be a small increase in transmission loss as the number of stringers was increased. The effect of high damping was also investigated.
L. R. Koval, "Effect of Longitudinal Stringers on Sound Transmission into a Thin Cylindrical Shell," Journal of Aircraft, American Institute of Aeronautics and Astronautics (AIAA), Jan 1978.
The definitive version is available at http://dx.doi.org/10.2514/3.58454
Mechanical and Aerospace Engineering
Article - Journal
© 1978 American Institute of Aeronautics and Astronautics (AIAA), All rights reserved.