Tunable stiffness mechanical filter and amplifier
First Claim
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1. A tunable stiffness mechanical filter comprising:
- a) a negative stiffness structure comprising an elastic negative stiffness characteristic;
b) an input coupler to the negative stiffness structure;
c) a tuner for the negative stiffness structure;
d) an output sensor located along the negative stiffness structure; and
e) wherein the tuner is configured to apply an axial force along a tuning axis of the negative stiffness structure, and wherein the input coupler is configured to apply an input transverse to the tuning axis.
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Abstract
In an embodiment, a tunable stiffness mechanical filter is provided including an input coupler to a negative stiffness structure with a negative stiffness characteristic, and further including a tuner for tuning the negative stiffness structure. An output sensor is located along the negative stiffness structure. The filter may include an amplifier and/or a driver coupled between the output sensor and the negative stiffness structure.
24 Citations
25 Claims
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1. A tunable stiffness mechanical filter comprising:
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a) a negative stiffness structure comprising an elastic negative stiffness characteristic; b) an input coupler to the negative stiffness structure; c) a tuner for the negative stiffness structure; d) an output sensor located along the negative stiffness structure; and e) wherein the tuner is configured to apply an axial force along a tuning axis of the negative stiffness structure, and wherein the input coupler is configured to apply an input transverse to the tuning axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A tunable stiffness mechanical filter comprising:
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a) an elastic negative stiffness member; b) an input coupler adapted to couple an input force to the negative stiffness member; c) an output sensor is positioned to sense a response of the negative stiffness member to the input force; d) a tuning actuator coupled to the negative stiffness member so as to adjust the response of the negative stiffness member to the input force; e) a drive portion coupled to provide feedback from the output sensor to the negative stiffness structure; and f) wherein the negative stiffness member is secured at one end such that application of a tuning force by the tuning actuator at an other end of the negative stiffness member compresses the negative stiffness member axially to adjust the response of the negative stiffness member to the input force, and wherein the drive portion amplifies and feeds back the response of the negative stiffness member. - View Dependent Claims (17)
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18. A tunable stiffness mechanical filter comprising:
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a) a variable stiffness beam comprising a variable stiffness characteristic tuned through axial application of compressive force to at least one end of the variable stiffness beam; b) an input coupler to supply an input to the variable stiffness beam; c) a tuner coupled to a first end of the variable stiffness beam; and d) a sensor adapted to sense at least one of;
(1) a displacement;
(2) a velocity;
or (3) an acceleration of the variable stiffness beam. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A tunable stiffness mechanical filter comprising:
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a) a negative stiffness structure comprising a negative stiffness characteristic; b) an input coupler to the negative stiffness structure; c) a tuner for the negative stiffness structure; d) an output sensor located along the negative stiffness structure; e) wherein the negative stiffness structure comprises a negative stiffness member comprising a first end and a second end; f) wherein the tuner is coupled to at least one of the first end or the second end of the negative stiffness member to allow application of a compressive tuning force to the negative stiffness member along a tuning axis; g) wherein the input coupler is adapted to receive an input signal, transverse to the tuning axis, for causing displacement of the negative stiffness member; h) wherein the output sensor is positioned to sense at least one of;
(1) a displacement;
(2) a velocity;
or (3) an acceleration of the negative stiffness member;i) wherein the tuner further comprises at least one of;
(1) an electrostatic actuator;
(2) an electromagnetic actuator;
(3) a magnetostrictive actuator;
(4) a thermal actuator;
(5) an electrochemical actuator;
(6) an ionic actuator;
or (7) a piezoelectric; andj) wherein at least one of the first end or the second end of the negative stiffness member is secured to a piezoelectric substrate.
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Specification