Vibration isolation platform composed of three groups of oblique springs

Abstract

The invention discloses a vibration isolation platform composed of three groups of oblique springs. The vibration isolation platform composed of the three groups of oblique springs comprises the threegroups of oblique springs, a vertical spring and a carrying platform, wherein the three groups of oblique springs are located in the same vertical plane, the three groups of oblique springs are symmetrically arranged at the two sides of the carrying platform, the three groups of oblique springs comprise three pairs of oblique springs, and one pair of the oblique springs at the upper side and onepair of the oblique springs at the lower side are arranged in the form of up-down symmetry by taking one pair of the oblique springs at the middle as a center; the three pairs of oblique springs comprise six oblique springs which are arranged in the form of left-right symmetry, one end of each oblique spring is movably connected with the carrying platform, and the other end of each oblique springis movably connected with a movable seat I; and the vertical spring is arranged on the lower part of the carrying platform, one end of the vertical spring is movably connected with the lower part of the carrying platform, and the other end of the vertical spring is fixedly connected with a movable seat II. According to the vibration isolation platform composed of the three groups of oblique springs, the oblique springs are adjusted by adjusting a slide element and a support column, so that the negative stiffness generated by the three groups of oblique springs is counteracted with the positivestiffness of the vertical spring to reach dynamic stiffness zero, and a wider zero stiffness characteristic interval and a better vibration reduction effect are achieved.

Description

technical field [0001] The invention belongs to the technical field of vibration isolation, and in particular relates to a vibration isolation platform composed of three groups of oblique springs. Background technique [0002] The so-called quasi-zero stiffness shock absorber is a vibration isolation platform with high static stiffness and low dynamic stiffness. High static stiffness means high load capacity or small static load deformation, and low dynamic stiffness means low or close to zero. natural frequency. The shock absorber with this characteristic is mainly to solve the following problems caused by the traditional linear shock absorber composed of mass m and stiffness k: because the effective vibration isolation frequency of the linear shock absorber is greater than the natural frequency twice the root number (k / m The square root sign), so if a wider vibration isolation frequency range is to be obtained, the stiffness k of the linear damper needs to be infinitely s...

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Problems solved by technology

The shock absorber with this characteristic is mainly to solve the following problems caused by the traditional linear shock absorber composed of mass m and stiffness k: because the effective vibration isolation frequency of the linear shock absorber is greater than the natural frequency twice the root number (k / m square root sign), so if a wide frequency range of vibration isolation is to be obtained, the stiffness k of the linear damper needs to be infinitely small (the natural frequency is closer to 0), but this will cause extremely large static deformation

[0004] At the same time, oblique springs with precompression and nonlinear characteristics can increase the range of quasi-zero stiffness, but oblique springs with nonlinear characteristics are difficult to manufacture and can only exist at the theoretical level

[0005] In the design and characteristic research of the new quasi-zero stiffness vibration isolator announced by Meng Lingshuai in 2015, a quasi-zero stiffness (QZS) vibration damper composed of a single set of oblique springs is mentioned. image 3 shown, but this quasi-zero stiffness shock absorber only maintains a very narrow range near the static equilibrium point

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