Tuned spring-mass vibration absorber
AssigneeUnited Technologies Corporation
InventorJohn Marshall II, deceased
Life of this patent
Estimating the term…
Abstract
A tuned spring-mass vibration absorber in which a dynamic mass is suspended from a vibrating support member, such as a helicopter fuselage, by a plurality of cantilevered leaf springs integrally connected to the dynamic mass at selected stations so that the mass CG and the spring center of force are coincident, so that the springs are shaped to constitute a substantial part of the vibration absorber effective mass, and so that the springs are pivotally connected to the support member so as to impart no moments thereto.
Claims8
A tuned spring-mass vibration absorber adapted for use in a helicopter fuselage comprising:
- (A) a dynamic mass member of selected mass and shaped to define at least one flat surface and a selectively positioned mass center of gravity,
- (B) means suspending said dynamic mass member from the fuselage comprising:
- (1) three leaf spring members comprising a center spring member with side spring members on opposite sides thereof and each spring member being of constant thickness and having a wide end and tapering gradually therefrom to a narrow end and extending in parallel relationship to one another and with the width of the center spring member being twice that of the side spring members and with the center spring member being oriented in the opposite direction to the side spring members,
- (2) first means pivotally connecting the narrow ends of said leaf spring members to the fuselage so that no moment reactions are imparted to the fuselage from the spring members, and
- (3) second means rigidly connecting the wide ends of said spring members to said mass member flat surface and at stations in spaced relation to the mass member center of gravity so that said mass member is suspended from said spring members for vertical motion with respect to the fuselage.
Dependencies are inferred from the claim text.