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
Boeing Vertol Company, Philadelphia, Pennsylvania
Publication date: 1975-07-01
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