Passive damping in optical tables using highly distributed inertial dampers

Jeffrey A. Zapfe

doi:10.1117/12.274213

9 May 1997 Passive damping in optical tables using highly distributed inertial dampers

Jeffrey A. Zapfe

Proceedings Volume 3045, Smart Structures and Materials 1997: Passive Damping and Isolation; (1997) https://doi.org/10.1117/12.274213
Event: Smart Structures and Materials '97, 1997, San Diego, CA, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.274213

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