A quasi-zero-stiffness vibration isolator with semi-circular slide rail

Abstract

The invention discloses a semicircular sliding rail-type quasi-zero rigidity vibration isolator. A first spring is vertically arranged on a connecting-rod assembly on a positive-rigidity mechanism, and a carrying platform on the positive-rigidity mechanism is connected with a negative-rigidity mechanism through positive-rigidity and negative-rigidity connecting rods, so that the positive-rigiditymechanism is connected to the inner wall of a lower frame, wherein the negative-rigidity mechanism is connected with the positive-negative mechanism in parallel through rotation pairs formed between the positive-rigidity and negative-rigidity connecting rods and second springs, so that the dynamic rigidity of the vibration isolator at a balanced position is zero, the resonance frequency is extremely low, and the isolation performance of low-frequency vibrations is improved; meanwhile, the first spring with the proper rigidity and the second springs with the proper rigidity are selected, so that a force transmissibility curve is moved leftwards, the initial vibration isolation frequency is reduced, the vibration isolation bandwidth is increased, and the isolation performance of the low-frequency vibrations of the vibration isolator is improved. In conclusion, the vibration isolator has high static rigidity, low dynamic rigidity and a large vibration isolation bandwidth and can be applied and popularized for control over the low-frequency vibrations.

Description

technical field [0001] The invention belongs to the technical field of vibration isolators, in particular to a semicircular slide rail type quasi-zero stiffness vibration isolator. Background technique [0002] In actual engineering production, cyclical changes in physical state or reciprocating motion of objects, that is, vibration, are common. In most cases, vibration is not beneficial, such as bridge damage caused by noise, earthquakes, and resonance, and train wheel rail collision vibration. These vibrations will cause certain harm and inconvenience to scientific research, production activities and daily life. At present, in linear vibration isolation systems, better vibration isolation performance is generally obtained by minimizing the natural frequency in the system, but this method will reduce the total stiffness of the vibration isolation system or be isolated The increase in mass will affect the bearing capacity of the vibration isolation system, causing excessive...

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Problems solved by technology

[0002] In actual engineering production, cyclical changes in physical state or reciprocating motion of objects, that is, vibration, are common. In most cases, vibration is not beneficial, such as bridge damage caused by noise, earthquakes, and resonance, and train wheel rail collision vibration. These vibrations will cause certain harm and inconvenience to scientific research, production activities and daily life.

At present, in linear vibration isolation systems, better vibration isolation performance is generally obtained by minimizing the natural frequency in the system, but this method will reduce the total stiffness of the vibration isolation system or be isolated The increase in mass will affect the bearing capacity of the vibration isolation system, causing excessive static deformation or instability of the vibration isolation system

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