A positive and negative stiffness parallel low frequency vibration isolator

Abstract

The invention relates to a positive and negative rigidity parallel low-frequency vibration isolator, which comprises a bottom cover, an outer bracket is arranged on its upper surface along the circumference, and an inner bracket coaxial with it and whose height is reduced is arranged on the inner ring, the outer bracket, the inner The bracket and the bottom cover form a cavity structure with a top opening. A positive and negative stiffness adjustment mechanism is installed in the cavity structure. The top opening of the cavity structure is closed by the top cover; The support spring is connected to the center of the top surface of the spring support along the axial direction, and a beam extending radially is evenly arranged on the circumferential side of the spring support along the circumferential direction. One end of the beam is fixedly connected with the spring support, and the other end is passed through the pressure spring The pressure spring adjusting bolt is connected with the outer bracket; the lower surface of the beam is connected with the bottom cover through the main spring. The invention realizes low-frequency and ultra-low-frequency vibration isolation of equipment through parallel connection of positive and negative stiffness.

Description

technical field [0001] The invention relates to the technical field of vibration and noise reduction of mechanical equipment, in particular to a positive and negative stiffness parallel low-frequency vibration isolator. Background technique [0002] Traditional linear vibration isolation technology is widely used in the field of vibration and noise reduction of mechanical equipment, but in the low-frequency excitation environment, linear vibration isolation technology cannot solve the contradiction between good vibration isolation effect and small static displacement, so active vibration isolation Technology is more and more applied to the field of low frequency vibration isolation. [0003] However, active vibration isolation technology often requires external energy input, which has the disadvantages of complex structure and high cost. Non-linear vibration isolation technology can also achieve low-frequency vibration isolation, and air springs are a typical example. The ...

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Problems solved by technology

The air spring has the characteristics of high support capacity and low stiffness, but it still needs an auxiliary air source while it is working, and the structure is complex; the natural frequency of the air spring is generally 2 to 3 Hz. In order to further reduce its vibration isolation frequency, It is often necessary to apply active control on the basis of the air spring passive vibration isolation system, which increases the cost of vibration isolation

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