Semi-actively controlled vertical vibration isolator with quasi-zero stiffness

Abstract

The invention discloses a semi-active control type vertical vibration isolator with quasi-zero stiffness. The semi-active control type vertical vibration isolator with quasi-zero stiffness comprises a base and a load-bearing platform, wherein the load-bearing platform is mounted in the middle of the base through a spiral spring A; four servo valves are symmetrically arranged at the bottoms of four sides of the base along side walls; each servo valve is successively provided with a hydraulic cylinder controlled by the servo valve, a hydraulic cylinder push rod driven by the hydraulic cylinder and a spiral spring sleeve mounted on the top of the hydraulic cylinder push rod transversely; vertical sliding rods are fixed on the side walls of the base; one end of each spiral spring sleeve is connected to the corresponding sliding rod in a sleeving manner; a spiral spring B is mounted in each spiral spring sleeve; and each spiral spring B is movably connected with the load-bearing platform through a connecting rod. By the semi-active control type vertical vibration isolator with quasi-zero stiffness, low-frequency vibration transmitted from a ground foundation to upper-layer carrying equipment is isolated; meanwhile, an actuating device is introduced in the vertical vibration isolator, therefore, the system still has low dynamic stiffness under the condition of different carrying weights, a vibration isolation system is always in a quasi-zero stiffness state, low-frequency vibration is isolated effectively, and negative effects caused by the low-frequency vibration are isolated to a maximum degree.

Description

technical field [0001] The invention relates to the technical field of vibration isolators, in particular to a semi-active control type vertical vibration isolator with quasi-zero stiffness. Background technique [0002] With the development of society and the improvement of people's living standards, people have higher and higher requirements for the quality of mechanical vibration around them, especially in precision or ultra-precision environments such as vehicles and operating tables. Studies have shown that people are most sensitive to low-frequency vibrations. Long-term exposure to low-frequency vibrations will cause adverse reactions such as fatigue and anxiety; and low-frequency vibrations will also cause greater damage to mechanical equipment, which will lead to reduced work efficiency and even One of the important causes of fatigue damage. Therefore, it is particularly necessary to isolate low-frequency vibrations and protect people and other machinery from low-fr...

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Problems solved by technology

[0004] To reduce the natural frequency of the vibration isolation system, the effective way is to reduce the stiffness of the vibration isolation system, and reducing the stiffness of the vibration isolation system will cause a large displacement of the mass carried by the vibration isolation system and reduce the bearing capacity of the system

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