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Helicopter Vibration Reduction with Pendulum Absorbers

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Expansion of helicopter flight envelopes coupled with more‐stringent requirements for crew and passenger comfort have dictated better control of helicopter vibration. One technique of controlling N/rev vibration is by the use of pendulum absorbers. This paper reports the analytical and experimental results of blade‐mounted pendulum absorbers to reduce 4/rev vibration on a 4‐bladed tandem‐rotor helicopter. Both experimental and analytical results show a significant reduction in 4/rev vibration with optimum pendulum tuning. The importance of pendulum tuning as well as the use of generalized coordinates to obtain reduction of vibratory loads are discussed.
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Document Type: Research Article

Affiliations: Boeing Vertol Company, Philadelphia, Pennsylvania

Publication date: 1975-07-01

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

    Journal subscribers who are AHS members log in here if you are not already logged in.

    Authors can find submission guidelines and related information on the AHS website.

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