Method for realizing negative stiffness by using polygonal section extreme value of compressible medium

By designing a compressible container with a positive cross-section of polyhedron, negative stiffness is achieved using the positive value of the body, which solves the problems of large prepressure pressure and high material requirements in the existing negative stiffness spring design, and realizes high-performance negative stiffness application in the heavy-load field.

CN119670271APending Publication Date: 2025-03-21TIANJIN RES INST OF ELECTRIC SCI
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Patent Information

Application Number
CN202411603168.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-11
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

The existing negative stiffness spring designs have problems such as high prepressure pressure, easy to cause geometric nonlinearity and higher material requirements, and are difficult to apply in heavy load fields.

Method used

A compressible container with a positive polyhedron cross section is used to achieve negative stiffness using its body positive value. By adjusting the design parameters and internal and external pressure difference of the container, a negative stiffness curve is drawn until the required negative stiffness performance requirements are met.

Benefits of technology

Negative stiffness in the same direction as positive stiffness is achieved, prestress, stroke and mechanism friction interference is avoided, and high-performance negative stiffness springs with micro vibration levels on larger strokes are obtained, which can be used in heavy load fields.

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Abstract

The invention discloses a method for realizing negative stiffness by utilizing a container volume extreme value in a volume-variable container by utilizing a compressible medium. The method aims at solving the problems that the pre-compression force is large, geometric nonlinearity is easily caused and the like under the condition that the projection of a pre-compression spring orthogonal to a positive stiffness spring in the vertical direction is used for achieving negative stiffness. A compressible container with the section being a regular polyhedron is provided, the negative stiffness structure designed through the method is used, a pre-compression elastic body in the direction orthogonal to a positive stiffness spring is omitted, and the negative stiffness in the same direction as the positive stiffness is achieved. And the contradiction among the prestress, the stroke and the mechanism friction interference is avoided. By means of the method, the high-performance negative stiffness spring with the micro-vibration level on the large stroke can be obtained.
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