In cases where a structure's excitation is constant the noise radiated from the structure can be minimized by making structural modifications within given design constraints. In this paper minimizing both the sound power radiated from and the sound pressure within finite baffled ducts are considered as design objectives. The diameter-to-length ratio of the ducts and the vibration velocity of the interior surface of the ducts are considered as design variables. The relationship between the sound radiation (power and pressure) and the diameter-to-length ratio as well as the related design sensitivities are shown. The sound power/pressure and the design sensitivities with respect to the vibration velocity of the interior surface at different frequencies are also presented. Based on the results presented some constraints and guidelines for the optimum design of baffled finite ducts with respect to minimizing radiated sound are stated.
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