A low-frequency vibration isolation system and vibration reduction method

Abstract

The invention belongs to the technical field of vibration and noise control and particularly relates to a high-performance low-frequency vibration isolation technology having stronger applicability. For solving the problem of low-frequency vibration isolation of mechanical devices, the invention provides a low-frequency vibration isolation system. The low-frequency vibration isolation system comprises a quasi-zero stiffness module, a vibration signal monitoring module, a control module and an execution module. Firstly, passive isolation of low-frequency vibration is achieved by utilizing the quasi-zero stiffness vibration isolation module, whether a control signal is output to the execution module through the control module or not is judged according to the motion state of the quasi-zero stiffness vibration isolation module, and accordingly the system has the advantage of always working on an attractor having the best whole vibration isolation effect. The system is good in operabilityand simple in identification and suitable for engineering practice application and provides an efficient and reliable new thought for low-frequency vibration control, required input energy is smaller,and the executed control times are fewer.

Description

technical field [0001] The invention belongs to the technical field of vibration and noise control, and relates to a high-performance low-frequency vibration isolation technology with strong applicability, in particular to a low-frequency vibration isolation system and a vibration reduction method. Background technique [0002] In the human living environment and engineering practice, vibration is ubiquitous. Harmful vibration will deform or destroy objects, which may affect the safety and reliability of major projects, the life and normal operation of machines, and endanger human health. For example, optical platforms, seismic wave detectors, and gravitational wave detection devices, etc. These devices generally have high requirements for vibration isolation, and even need to avoid weak vibrations such as ground pulsation. At this time, traditional vibration isolators are often difficult to achieve the desired vibration isolation goal because their own natural frequency can...

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Problems solved by technology

For a vibration isolation system fixed by a vibration isolation object, in order to improve the vibration isolation effect of the system, it is necessary to reduce the system stiffness k, but the reduction of the stiffness k will cause the static deformation of the system to become larger, and it is difficult to meet the stability requirements of the system, that is, there is Two contradictions between large bearing capacity and ultra-low frequency vibration isolation, ultra-low stiffness and positional stability

The actuators of the active vibration isolation system are difficult to meet the requirements of actual engineering. At present, they can only be applied to equipment with small volume and weight. The structure of the active vibration isolation system is relatively complicated, and the manufacturing cost is high. Inevitably there are unfavorable factors such as time lag in the process, so that the theoretically excellent control method is difficult to achieve satisfactory results in practical applications. Therefore, the problem of low-frequency vibration control needs to find another way

The high static and low dynamic stiffness vibration isolator is a combined strong nonlinear vibration isolator, which can meet the requirements of high load capacity and low dynamic stiffness at the same time, and effectively isolate low-frequency vibrations, but the vibration isolation effect of the quasi-zero stiffness vibration isolation system depends on Due to the initial conditions and system parameters, affected by environmental factors, the quasi-zero stiffness vibration isolation system tends to operate in a state of large-amplitude motion, which weakens its low-frequency vibration isolation effect

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