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Negative Stiffness Hydraulic System

A hydraulic system, negative stiffness technology, applied in the spring/shock absorber functional characteristics, vibration suppression adjustment, spring/shock absorber, etc., can solve the problem of not being able to reset the minimum stiffness, limit, etc.

Active Publication Date: 2018-08-10
HRL LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the system suffers from the inability to reset its minimum stiffness after sliding, which limits its ability to isolate unwanted vibrations

Method used

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  • Negative Stiffness Hydraulic System
  • Negative Stiffness Hydraulic System
  • Negative Stiffness Hydraulic System

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Embodiment Construction

[0052] In many mechanical structures, such as those used in transportation systems, it is desirable to isolate broadband vibrations when subjected to a wide range of static forces (eg, G-loads). The present invention relates to embodiments of a primary passive system (eg, variable stiffness structure) capable of supporting large static forces while still isolating vibrations.

[0053] The variable stiffness structure of the present invention may be incorporated into any system or device through which it is desired to prevent or at least reduce the transmission of vibrations, such as, for example, a gyroscope (where the accuracy of the gyroscope is at the level of vibration isolation ratio), passenger cars (e.g. vibration isolation between engine and vehicle chassis or wheels and road), aircraft (e.g. vibration isolation between helicopter blades and helicopter hub), cameras (where vibration reduction can improve image quality), radar and other sensitive measurement equipment, ...

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Abstract

A variable stiffness structure configured to support a variable load, the variable stiffness structure including a positive stiffness element coupled to the variable load, a negative stiffness element, a hydraulic system coupled to the positive and negative stiffness elements and configured to adjust a relative position of the positive and negative stiffness elements in response to a change in the variable load, while the variable stiffness structure supports the variable load.

Description

technical field [0001] The following description relates generally to the stiffness of nonlinear structures, and more specifically, to negative stiffness hydraulic systems. Background technique [0002] Negative stiffness can result from nonlinear behavior. Examples of simple and widely used nonlinear structures that can produce negative stiffness include snap-jump beams, buckling beams, excessive rotation, and rolling or sliding contact between components. Nonlinear structures that exhibit both positive and negative stiffness are potentially useful in a variety of mechanical design applications. For example, negative stiffness elements (eg, buckling-type beams that can exhibit nonlinear behavior) can be combined with positive stiffness elements, such as support springs, to provide structures with zero or quasi-zero stiffness (QZS) over a range of displacements. The quasi-zero stiffness of the structure can be used (used for) to isolate another object or mass (e.g., a stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F15/023F16F15/027
CPCF16F15/027F16F2228/063F16F2228/066
Inventor C·B·邱吉尔G·A·赫雷拉G·P·麦克奈特J·J·米库尔斯基
Owner HRL LAB