Transmissibility Across Simply Supported Thin Plates. II. Rectangular Plates with Loading Masses and Straight Ribs.

摘要

The transmissibility of thin, simply supported, rectangular aluminum plates of like dimensions has been determined experimentally in the frequency range 25-3025 Hz. Comparison has been made between the results of measurements on an unloaded plate, on plates loaded centrally by concentrated masses of small and large contact area, and on plates loaded by seven different straight-rib configurations, one of which utilized X-cut ribs that stretched diagonally between opposite plate corners. The additional mass was always equal to that of the plates so that the effectiveness of the mass in reducing transmissibility could be evaluated as a function of its geometry. The experimental transmissibilities of the unloaded and centrally mass-loaded plates were in excellent agreement with theoretical prediction. At frequencies above the fundamental resonance of the plates, the greatest overall reduction in transmissibility was provided by the X-cut ribs; whereas, at the fundamental resonance itself, the greatest reduction was provided by a single central rib placed parallel to the shorter plate sides. (Author)