A Rotor System Adjustable Vibration Absorber Adjusted by Piezoelectric Ceramics

Abstract

The invention discloses an adjustable vibration absorber for a rotor system that is adjusted by piezoelectric ceramics. The main vibration damping object of the vibration damping mechanism is the rotor. The structure adopts a permanent magnet negative stiffness mechanism and a tension sinusoidal positive stiffness mechanism in parallel, based on the vibration state of the rotor. The inverse piezoelectric effect of piezoelectric ceramics is used to amplify the initial displacement of the piezoelectric ceramics through the stroke amplification mechanism of the arc flexible hinge, and finally acts on the tension string, thus changing the adjustment stiffness of the vibration absorber and achieving broadband vibration reduction. The vibration absorber has the advantages of excellent vibration reduction effect, compact overall structure, easy adjustment, low energy consumption, etc. It has strong usability and application prospects, and can provide good vibration reduction effect.

Description

technical field [0001] The invention relates to the field of vibration absorbing devices, in particular to an adjustable vibration absorber for a rotor system regulated by piezoelectric ceramics. Background technique [0002] Vibration is an inevitable phenomenon in the operation of various rotating machinery. During the operation of the rotating machinery, its core component, the rotor, will vibrate due to unbalance, misalignment, rubbing, etc. The strong vibration will have a negative impact on the stable operation of the rotating machinery, and in severe cases, it may cause shutdown or even machine destruction. fatal accident. Therefore, reducing the vibration of the rotor is of great significance to improving the reliability of the equipment and ensuring the safe and stable operation of the machine. [0003] As a commonly used vibration reduction method, the dynamic vibration absorber has the characteristics of simple structure, good vibration and noise reduction effec...

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Problems solved by technology

Many scholars have combined the variable stiffness mechanism with the vibration absorber to achieve the purpose of changing its natural frequency and reasonably avoiding the critical speed region, such as using variable stiffness mechanisms such as magnetorheological elastomers and memory alloys. However, these methods are easy to cause The structure of the vibration absorber is too complicated, and the space occupied is too large, which limits the convenience of its use

[0005] Although the traditional new type of vibration absorber that uses a permanent magnet negative stiffness mechanism and a tension string positive stiffness mechanism in parallel has the advantages of a wide tuning range, the method of changing the stiffness of the tension string through a stepping motor drive takes up a lot of space and is prone to noise. Problems such as low resolution and slow response speed

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