Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1977-09-13
1979-02-20
Gerin, Leonard H.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
180 1R, 244 1727, 248564, 280688, F16F 1510, B64C 2700, A47G 2900
Patent
active
041400283
ABSTRACT:
A vibration isolation system wherein a vibrating mass such as a helicopter rotor-transmission assembly is spring coupled to a body to be isolated, such as the helicopter fuselage, at a plurality of coupling locations. Each coupling location includes a weighted lever arm pivotally connected to the vibrating mass and to the body and a coupling spring connected to the weighted lever arm for transmitting the rotor forces of the rotor-transmission assembly to the fuselage through the pivot connections on the lever arm. The coupling spring is in the form of an elongated spring arm connected at one end to the weighted lever arm and at the other end to the body through a pivot link, the latter being required to accommodate shortening of the spring during flexure. The spring forces transmitted to the fuselage through the coupling springs due to linear vibration forces are cancelled at the characteristic rotor frequency by equal and opposite inertial forces produced by the weighted lever arms. A modified system is disclosed wherein spring forces transmitted to the fuselage due to angular as well as linear vibration forces are isolated. In this system a second coupling spring is added to the basic spring arm arrangement such that the second spring flexes only in response to either the linear or angular vibratory component, but not to both. This causes the spring forces applied to the fuselage in response to angular vibration to be different from the spring forces applied due to linear vibration and this difference in spring forces establishes moment as well as linear force equilibrium such that the fuselage is completely isolated from angular as well as linear vibration.
REFERENCES:
patent: 1486763 (1924-03-01), Joubert
patent: 2744749 (1956-05-01), Fiedor
patent: 2833552 (1958-05-01), Polhemus
patent: 3322379 (1967-05-01), Flannely
patent: 3552694 (1971-01-01), Flanely
patent: 3698663 (1972-10-01), Balke et al.
patent: 3845917 (1974-11-01), Drees
patent: 3857534 (1974-12-01), Drees
patent: 3858831 (1975-01-01), Halwes
patent: 4088042 (1978-05-01), Desjardins et al.
"Development of the Kinematic Focal Isolation System for Helicopter Rotors" by Balke in `The Shock & Vibrator Bulletin,` Nov. 1968.
"Nodalization Applied to Helicopter" by Shipman Bell Helicopter Co., Division of Textron, Inc.
Gerin Leonard H.
The Boeing Company
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