Positive and negative stiffness parallel type low-frequency vibration isolator

Abstract

The invention relates to a positive and negative stiffness parallel type low-frequency vibration isolator. The positive and negative stiffness parallel type low-frequency vibration isolator comprisesa bottom cover. A circle of outer support is arranged on the circumference of the upper surface of the bottom cover. An inner support lower than the outer support and coaxial with the outer support isarranged on the inner ring of the outer support. The outer support, the inner support and the bottom cover define a cavity structure with a top opening. A positive and negative stiffness adjusting mechanism is mounted in the cavity structure. The top opening of the cavity structure is sealed through a top cover. A spring support column is fixedly mounted in the position, located on the inner ringof the inner support, of the circle center of the bottom cover. The circle center of the top surface of the spring support column is axially connected with a supporting spring. Beams extending radially are uniformly arranged in the circumferential direction of the circumferential side face of the spring support column. One ends of the beams are fixedly connected with the spring support column, and the other ends of the beams are connected with the outer support through pressure springs and pressure spring adjusting bolts. The lower surfaces of the beams are connected with the bottom cover through main springs. The positive and negative stiffness parallel type low-frequency vibration isolator realizes low-frequency and ultralow-frequency vibration isolation of equipment through positive and negative stiffness parallel connection.

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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