Abstract
Theoretical calculations of the backscattering of a plane sound wave by a rib stiffened Timoshenko–Mindlin plate are presented. An exact solution is compared with two saddle point integral approximations. One saddle point integral approximation takes into account the near coalescence of the leaky wave pole and the saddle point. Mass loading of the rib and different rib constraints are discussed. The range of validity of the model is also given.
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