Vibration-absorbing quasi-zero stiffness vibration isolators

Abstract

The invention provides a quasi-zero stiffness vibration isolator capable of absorbing vibration, and belongs to the technical field of vibration isolation and vibration reduction of mechanical engineering. The quasi-zero stiffness vibration isolator comprises a quasi-zero stiffness vibration isolator body, a stand column, a vibration absorption mass block and a vibration absorption spring, whereinthe quasi-zero stiffness vibration isolator body is provided with a main mass block, the stand column vertically slides on the main mass block, the vibration absorption mass block vertically slides on the stand column, one end of the vibration absorption spring is connected with the main mass block, and the other end of the vibration absorption spring is connected with the vibration absorption mass block. According to the quasi-zero stiffness vibration isolator capable of absorbing the vibration, the peak value of a system resonance peak in the quasi-zero stiffness vibration isolator body canbe reduced through arrangement of the stand column, the vibration absorption mass block and the vibration absorption spring on the quasi-zero stiffness vibration isolator body, so that the stabilityof the quasi-zero stiffness vibration isolator body in a low frequency section is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering vibration isolation and vibration reduction, and more specifically relates to a vibration-absorbing quasi-zero-stiffness vibration isolator. Background technique [0002] The most commonly used method is the vibration isolation method. When the vibration isolation frequency of the traditional linear vibration isolation system is required to be greater than 1.414 times the natural frequency of the vibration isolation system, the vibration isolation system can have a good vibration isolation effect. Therefore, the effective isolation of the traditional linear vibration isolation system The vibration frequency is usually high frequency, but in reality, it is the low frequency that needs to be isolated by the vibration isolation system, because the machine itself can also perform vibration isolation on high frequencies, but not only does it not have the effect of vibration isolation on l...

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Problems solved by technology

[0002] The most commonly used method is the vibration isolation method. When the vibration isolation frequency of the traditional linear vibration isolation system is required to be greater than 1.414 times the natural frequency of the vibration isolation system, the vibration isolation system can have a good vibration isolation effect. Therefore, the effective isolation of the traditional linear vibration isolation system The vibration frequency is usually high frequency, but in reality, it is the low frequency that needs to be isolated by the vibration isolation system, because the machine itself can also perform vibration isolation on high frequencies, but not only does it not have the effect of vibration isolation on low frequencies, the transmission linear vibration isolation system also The force excitation will be amplified, and in order for the traditional vibration isolator to also have the effect of vibration isolation for low-frequency excitation, the common method is to reduce the stiffness of the vibration isolation spring or increase the mass of the system, but the above two methods will be time-consuming System unstable and bulky

[0003] The quasi-zero-stiffness vibration isolators currently available are designed to reduce the impact of low frequencies. The use of nonlinear quasi-zero-stiffness vibration isolators can achieve low-frequency vibration isolation, although nonlinear quasi-zero-stiffness Vibration isolation is performed at low frequencies, but at low frequencies, the quasi-zero stiffness vibration isolator has a resonance peak with a high peak value. If the excitation frequency is exactly equal to the frequency at the resonance peak of the system, it will cause the quasi-zero stiffness system to quickly become unstable.

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