Nonlinear stiffness isolation system based on hydraulic negative stiffness mechanism

Abstract

The invention relates to a nonlinear stiffness vibration isolation system based on a hydraulic negative stiffness mechanism. The nonlinear stiffness vibration isolation system comprises hydraulic cylinders (2) and a rolling ball sliding channel bearing body (1), wherein, at least a pair of rolling ball sliding channels which is symmetrically distributed along the center axis of the side face of the rolling ball sliding channel bearing body (1) is arranged on the side face of the rolling ball sliding channel bearing body (1); each hydraulic cylinder (2) correspondingly abuts against a rolling ball sliding channel and the constant hydraulic force is applied to the rolling ball sliding channel bearing body (1) through the hydraulic cylinders (2), and the hydraulic cylinders (2) and the rolling ball sliding channel bearing body (1) form the hydraulic negative stiffness mechanism which provides the vertical negative stiffness; and a vertical positive stiffness spring (4) is further mountedat the bottom end of the rolling ball sliding channel bearing body (1), and vertical force is applied to the rolling ball sliding channel bearing body (1) through the vertical positive stiffness spring (4). According to the nonlinear stiffness vibration isolation system based on the hydraulic negative stiffness mechanism, compared with the prior art, nonlinear stiffness including quasi zero stiffness, piecewise linear stiffness and the like are achieved according to the required stiffness curve.

Description

technical field [0001] The invention relates to a nonlinear stiffness design system, in particular to a nonlinear stiffness vibration isolation system based on a hydraulic negative stiffness mechanism. Background technique [0002] Steel springs, rubber springs, disc springs, etc. are commonly used vibration isolation components at present, and the characteristics of the stiffness characteristic curves of these springs are fixed. For example, steel springs and rubber springs usually provide linear positive stiffness, although disc springs can provide Nonlinear stiffness, but its nonlinear characteristics are determined by existing formulas, and it is difficult for the above springs to achieve any nonlinear stiffness. [0003] Chinese patent ZL201620957512.1 discloses a nonlinear stiffness damping device based on an imitation leg structure, including long and short linkages, horizontal and vertical elastics; The long connecting rod group connected to the vibration source; th...

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Problems solved by technology

Although this patent can also achieve a certain degree of nonlinear stiffness, the structural bearing capacity is relatively poor

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