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Control of Helicopter Vibration Using the Dynamic Antiresonant Vibration Isolator
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Abstract
Helicopters characteristically exhibit large amplitude vibration at low frequencies, often caused by the main rotor-induced shears and moments. To reduce these vibrations, the rotor is designed to minimize the induced shears and moments, and the fuselage is designed to be free of resonance at the frequencies of these rotor-induced inputs. Also, many helicopters employ vibration mitigation devices.
Under the sponsorship of Eustis Directorate, Kaman Aerospace has conducted experimental and analytical studies of the Dynamic Antiresonant Vibration Isolator (DAVI), an inertially coupled isolation device which permits a high degree of isolation at discrete low frequencies without sacrifice of elastic stiffness.
The principles upon which the DAVI is based and laboratory test results are presented to show the independence of DAVI isolation from the weight of the isolated item. The application of the DAVI to crew seat isolation is also discussed. A summary of the work done on the application of the DAVI to helicopter rotor isolation, including results of analysis and testing, is presented.
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Authors
Citation
Jones, R., "Control of Helicopter Vibration Using the Dynamic Antiresonant Vibration Isolator," SAE Technical Paper 730892, 1973, https://doi.org/10.4271/730892.Also In
References
- Anderson R. C. Smith M. F. “A Study of the Kaman Dynamic Antiresonant Vibration Isolator (DAVI).” U.S. Army Aviation Materiel Laboratories Fort Eustis, Va. USAAVLABS Tech. Rept. 65-75 January 1966
- Jones R. “An Analytical and Model Test Research Study on the Kaman Dynamic Antiresonant Vibration Isolator (DAVI).” U.S. Army Aviation Materiel Laboratories Fort Eustis, Va. USAAVLABS Tech. Rept. 68-42 November 1968
- Jones R. “Flight Test Results of a DAVI Isolated Platform.” U.S. Army Aviation Materiel Laboratories Fort Eustis, Va. USAAVLABS Tech. Rept. 70-57 November 1970
- Theobald, C. E. Jr. Jones R. “Isolation of Helicopter Rotor Vibratory Forces From the Fuselage.” Wright Air Development Center Tech. Rept. 57-404 1958
- Crede C. E. Cavanaugh R. D. Abramson H. N. “Feasibility Study of an Active Vibration Isolator for a Helicopter Rotor.” Wright Air Development Center Tech. Rept. 58-163 1958
- Smollen L. E. Marshall P. Gabel R. “A Servo Controlled Rotor Vibration Isolation System for the Reduction of Helicopter Vibration.” Institute of the Aerospace Sciences Paper No. 62-34 January 1962
- Calcaterra P. C. Schubert D. W. “Isolation of Helicopter Rotor-Induced Vibration Using Active Elements.” U.S. Army Aviation Materiel Laboratories Fort Eustis, Va. USAAVLABS Tech. Rept. 69-8 June 1969
- Schuett E. P. “Passive Helicopter Isolation Using the Kaman Dynamic Antiresonant Vibration Isolator (DAVI).” U.S. Army Aviation Materiel Laboratories Fort Eustis, Va. USAAVLABS Tech. Rept. 68-46 December 1968
- vonHardenberg P. W. Saltanis P. B. “Ground Test Evaluation of the Sikorsky Active Transmission Isolation System.” Eustis Directorate U.S. Army Air Mobility Research and Development Laboratory Fort Eustis, Va. USAAMRDL Tech. Rept. 71-38 September 1971
- Jones R. “A Full Scale Experimental Feasibility Study of Helicopter Rotor Isolation Using the Dynamic Antiresonant Vibration Isolator.” Eustis Directorate U.S. Army Air Mobility Research and Development Laboratory Fort Eustis, Va. USAAMRDL Tech. Rept. 71-17 June 1971