Adaptive tuned vibration absorber, system utilizing same and method of controlling vibration therewith
First Claim
1. A tuned vibration absorber (35) adapted for attachment to a vibrating structure (32, 33), said absorber (35) having a stiffness and tuned mass (43) defining a resonant frequency, said absorber (35) comprising:
- (a) at least one flexible plate (58) exhibiting said tuned stiffness and having an elastic center (EC),(b) said tuned mass (43) exhibiting a center of gravity (CG) which is offset from said elastic center (EC), said tuned mass (43) interconnected to, and suspended by, said at least one flexible plate (58),(c) a base (28) interconnecting said at least one flexible plate (58) to a vibrating structure (32), and(d) means for adaptively moving a position of said tuned mass (43) relative to said base (28) thereby changing said resonant frequency.
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Accused Products
Abstract
A flex-plate tuned vibration absorber (35) including a tuned mass (43) flexibly suspended by one or more flex plates (58). In one aspect the tunable vibration absorber (TVA) (35) is adaptive in that the position of the mass is adaptively moveable with respect to its initial position, thereby effectuating a change in the TVA'"'"'s resonant frequency. In one embodiment, the tuned mass (43) moves along a rigid frame (53). In another, movement of the mass (43) statically stresses a preferably disc-shaped flexible plate (58) thereby changing its stiffness. Preferably, a reducer (78) gears down the speed of the motor (64). In another aspect, a TVA system includes a base sensor (40) providing a base vibration signal, a mass sensor (38) for providing a vibration signal of the tuned mass (43), and an electronic controller (42) for generating a control signal to the TVA (35). The TVA finds application for absorbing vibration in vibrating structures, such as in aircraft.
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Citations
40 Claims
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1. A tuned vibration absorber (35) adapted for attachment to a vibrating structure (32, 33), said absorber (35) having a stiffness and tuned mass (43) defining a resonant frequency, said absorber (35) comprising:
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(a) at least one flexible plate (58) exhibiting said tuned stiffness and having an elastic center (EC), (b) said tuned mass (43) exhibiting a center of gravity (CG) which is offset from said elastic center (EC), said tuned mass (43) interconnected to, and suspended by, said at least one flexible plate (58), (c) a base (28) interconnecting said at least one flexible plate (58) to a vibrating structure (32), and (d) means for adaptively moving a position of said tuned mass (43) relative to said base (28) thereby changing said resonant frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A tuned vibration absorber (35) including a tuned mass (43), a stiffness, and a resonant frequency, comprising:
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(a) a base (28), (b) a rigid frame (53), (c) a flexible plate (58) interconnecting between said base (28) and said rigid frame (53), said flexible plate (58) substantially providing said stiffness, (d) a tuned mass (43) slideable on said rigid frame (53), and (e) means for moving said tuned mass (43) along said rigid frame (53) to effectuate a change in resonant frequency of said tuned vibration absorber (35).
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29. A tuned vibration absorber (35), comprising:
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(a) a circular flexible disc (58), (b) a tuned mass (43) interconnecting and suspended by said flexible disc (58), and (c) means for statically and elastically deforming said flexible disc (58) to effectuate a change in stiffness thereby adjusting a resonant frequency of said absorber (35). - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. A tuned vibration absorber (35), comprising:
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(a) a base (28), (b) a flexible plate (58) extending from said base (28), (c) a tuned mass (43) suspended by said flexible plate (58), (d) a motor (64), (e) a reducer (78) interconnecting to said motor (64), and (f) means for coupling to said reducer (78) whereby energizing said motor (64) causes said tuned mass (43) to adaptively move relative to said base (28) stressing said flexible plate.
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37. A method for controlling vibration of an engine (30) at its operating frequency, said engine (30) having a plurality of spokes (22) providing radial support between a bearing housing (24) and a casing (26) of said engine (30), comprising the steps of:
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a) attaching at least one adaptive tuned absorber (35) directly to said engine (30) at a location adjacent to at least one of said spokes (22), said tuned vibration absorber (35) having a base (28), at least one flexible member extending from said base (28), and a tuned mass (43) suspended by said flexible member, b) moving said tuned mass (43) relative to said base (28) to effectuate a change in a resonant frequency of said at least one tuned absorber (35) which tracks said engine operating frequency. - View Dependent Claims (38, 39, 40)
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Specification