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Adjustable Negative Stiffness Mechanism

A negative stiffness, adjustable technology, applied in the field of adjustable negative stiffness mechanism, can solve problems such as inability to isolate

Active Publication Date: 2022-04-19
HRL LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, related art negative stiffness mechanisms that incorporate voice coils or piezoelectric components may not be able to isolate larger amplitude vibrations

Method used

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  • Adjustable Negative Stiffness Mechanism
  • Adjustable Negative Stiffness Mechanism
  • Adjustable Negative Stiffness Mechanism

Examples

Experimental program
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Embodiment Construction

[0018] The present disclosure relates to various embodiments of adjustable negative stiffness unit cells configured to alter the mechanical response of the unit cell. The present disclosure also relates to negative stiffness unit cell systems in which the mechanical response of each of the negative stiffness unit cells can be adjusted simultaneously and synchronously. The negative stiffness unit cells of the present disclosure can be incorporated into any desired structure or device depending on the intended purpose or function of the negative stiffness structure, for example as a tuned mass damper or as a mechanism for vibration isolation, shock absorption or signal processing. For example, the adjustable negative stiffness unit cells and mechanisms of the present disclosure may be incorporated into structures as payload mounts (e.g., mounts for sensitive electronics on a helicopter configured to isolate electronics from multiple rotor frequencies ) or as a component of a veh...

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Abstract

An adjustable negative stiffness mechanism is disclosed. The adjustable negative stiffness mechanism includes a central shaft, an outer annular member extending around the central axis, at least two negative stiffness elements extending between the central shaft and the annular member, and coupled to the negative stiffness Component actuators. Each of the negative stiffness elements has an inner end coupled to the central shaft and an outer end engaged with the ring member. The actuator is configured to compress and expand the negative stiffness element to adjust the negative stiffness mechanical response exhibited by the negative stiffness element.

Description

technical field [0001] The following description relates generally to negative stiffness mechanisms, and more specifically, to adjustable negative stiffness mechanisms. Background technique [0002] Various nonlinear structures exhibit negative mechanical stiffness, such as snap-jump bars and buckling bars. Negative stiffness can also be exhibited by various combinations and arrangements of springs and / or crossbars with pinned or clamped boundaries. For example, negative stiffness may be exhibited due to excessive rotation of one of the components or rolling or sliding contact between components. Negative stiffness mechanisms are suitable for a variety of applications, including vibration isolation, damping, and signal processing. [0003] However, many related art negative stiffness mechanisms do not incorporate variable negative stiffness springs. For example, related art negative stiffness mechanisms may incorporate external cams to vary the effective length of a lever...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F15/023F16F15/06
CPCF16F15/06F16F15/1215F16F2228/063F16F2230/0064
Inventor 克里斯多福·B·邱吉尔凯西·J·珊那特史隆·P·史密斯大卫·W·谢汉吉欧佛瑞·P·麦奈特
Owner HRL LAB