Mechanism for amplifying negative stiffness coefficient and ultra-low-frequency shock absorber composed of mechanism

Abstract

The invention discloses a mechanism for amplifying the negative stiffness coefficient and an ultra-low-frequency shock absorber composed of the mechanism, and belongs to the field of shock absorption.The mechanism is composed of one or more negative stiffness units and one or more positive stiffness units with the larger stiffness coefficient absolute value, wherein the one or more negative stiffness units and the one or more positive stiffness units are connected in series; the other two ends of the negative stiffness units and the positive stiffness units are used for being connected with ashock absorbed body and a base correspondingly; one or more negative stiffness amplifying mechanisms are connected with the one or more positive stiffness units having the appropriate stiffness coefficient and a main supporting effect in parallel and placed between the shock absorbed body and the base to form the ultra-low-frequency shock absorber; and the negative stiffness amplifying mechanismsenable the vibration displacement of the negative stiffness units to be amplified by the corresponding multiple, thus acting force which is generated by the negative stiffness units and transmitted by the negative stiffness amplifying mechanisms is amplified by the same multiple, and compared with the negative stiffness units in the negative stiffness amplifying mechanisms, the negative stiffnesscoefficients of the negative stiffness amplifying mechanisms are also amplified by the same multiple. The high negative stiffness coefficient and ultra-low-frequency shock absorption can be achievedthrough the small size, weight and cost.

Description

technical field [0001] The invention belongs to the technical field of vibration reduction, and more specifically relates to a technology for amplifying negative stiffness coefficients and connecting positive and negative stiffnesses in series and parallel to realize near-zero stiffness and high-performance vibration reduction. Background technique [0002] Vibration widely exists in many fields such as manufacturing equipment, measuring equipment, building structures, vehicles, and household appliances. In most of the above occasions, vibration will have negative effects, such as reducing operating accuracy, threatening structural safety, shortening service life, and deteriorating the working environment. [0003] The elastic element with positive stiffness characteristics (hereinafter referred to as the positive stiffness mechanism) can effectively buffer the transmission of force, that is, isolate the vibration transmission between structures. Generally, the smaller the ...

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Problems solved by technology

Similarly, the above defects also restrict the development of ultra-low frequency vibration reduction technology.

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