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Adjustable negative stiffness systems

A negative stiffness, adjustable technology, applied in the field of adjustable negative stiffness mechanism

Active Publication Date: 2019-08-23
HRL LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, many related art negative stiffness mechanisms are not configured to switch or vary between multiple negative stiffness states

Method used

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  • Adjustable negative stiffness systems
  • Adjustable negative stiffness systems
  • Adjustable negative stiffness systems

Examples

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Embodiment Construction

[0020] The present disclosure relates to various embodiments of adjustable negative stiffness systems. The negative stiffness system of the present disclosure may be incorporated into any desired structure or device depending on the intended goal or function of the negative stiffness system, for example, a tuned mass damper or a mechanism for vibration isolation, shock absorption, or signal processing. For example, the adjustable negative stiffness system of the present disclosure can be incorporated into structures as payload mounts (e.g., helicopters configured to isolate electronics from multiple rotor frequency, position and navigation sensors, radar, cameras, or antennae mounts for sensitive electronics on the vehicle) or as a component of a vehicle (for example, as a motor mount for a car configured to isolate vibration between the engine and chassis). The adjustable negative stiffness system of the present disclosure may be incorporated as a vibration and shock isolatio...

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Abstract

A variable stiffness structure includes a first negative stiffness element configured to buckle in a first direction, a second negative stiffness element configured to buckle in a second direction opposite to the first direction, and an actuator operatively coupled to ends of the first and second negative stiffness elements to control a stiffness of the variable stiffness structure. The first negative stiffness element and the second negative stiffness element are mode-3 buckling beams.

Description

technical field [0001] The present disclosure relates generally to negative stiffness mechanisms, and more particularly, 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] Furthermore, many related art negative stiffness mechanisms achieve highly isolated travel and near-linear negative stiffness by using higher-order mode buckling crossbars. However, using higher order mode buckling beams limits the ability...

Claims

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Application Information

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IPC IPC(8): F16F15/02
CPCF16F15/002F16F15/1215F16F2228/063F16F2230/0064F16F15/02
Inventor 克里斯多福·B·邱吉尔吉欧佛瑞·P·麦奈特克里斯多福·P·亨利大卫·W·谢汉
Owner HRL LAB
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