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9 May 1997 Passive damping in optical tables using highly distributed inertial dampers
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Optical tables are typically used in applications that require a very flat, rigid working surface. The grade of the optical table determines the amount of damping augmentation used to attenuate modal vibration. Discrete tuned mass dampers are a popular and effective damping method, however, their narrow effective bandwidth requires precise tuning to the table's resonant frequency. The present research deals with a damping method whereby a large number of small tuned dampers are distributed over the table's surface. In addition to the spatial distribution, the dampers are also distributed in frequency, providing energy dissipation over a wide frequency band. The wide effective bandwidth makes the distributed damping treatment extremely tolerant to variations in the table's dynamics. Test data is presented for a system of 349 dampers applied to a 243.8 cm by 121.9 cm by 20.3 cm optical table. The distributed damper attenuated both the first bending and the first torsion modes of the table, with a mass increase comparable to that realized with conventional discrete tuned dampers. The experimental results compared favorably to analytical predictions obtained using a full domain plate model.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeffrey A. Zapfe "Passive damping in optical tables using highly distributed inertial dampers", Proc. SPIE 3045, Smart Structures and Materials 1997: Passive Damping and Isolation, (9 May 1997);

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