The influence of aspect ratio and material on the sound radiation of low frequency modes of baffled cylindrical shells

The geometric properties of a simply supported cylindrical shell are defined by two aspect ratios: X = a/L and Y = h/a, where a, L and h are cylinder radius, length and thickness respectively. The material properties are defined by the aspect ratio Z = E/ρ of Young's modulus and the density, and by the Poisson ratio μ. The acoustic properties of low frequency modes in the case of steel and aluminum cylinders, the most important transition is that between the subsonic circumferential wavenumber and supersonic mode. For bronze cylinders, subsonic mode and edge mode are more common. A series of formulas and plots that helped to understand the radiation efficiency of low frequencies modes is presented