Vibration reduction ring based on annular piezoelectric stack

Abstract

The invention provides a vibration reduction ring based on an annular piezoelectric stack. The vibration reduction ring comprises the annular piezoelectric stack, a protective frame and an external shunt circuit, wherein the protective frame is a ring-mounted structure which sleeves a bearing, the protective frame is formed by combining an upper U-shaped protective frame and a lower U-shaped protective frame, the U-shaped grooves of the upper U-shaped protective frame and the lower U-shaped protective frame are combined into an annular empty groove, the annular piezoelectric stack is installedin the annular empty groove, the annular piezoelectric stack is connected with the external circuit, and a resistor and an inductor are connected in series. According to the vibration reduction ring,the vibration of a transmission system transmitted to a supporting bearing through a shaft and the bearing can be effectively reduced by utilizing piezoelectric shunt damping technology, the piezoelectric stack can be effectively prevented from bearing tangential stress and torque, and the service life of the piezoelectric stack is prolonged.

Description

technical field [0001] The invention relates to the field of vibration damping devices, which act on bearings and bearing housings or mechanical casings in rotor systems in the aviation field, and in particular relate to a vibration damping ring based on ring-shaped piezoelectric stacks. Background technique [0002] Traditional damping devices acting on bearings and housings include squeeze film dampers and the like. Squeeze oil film dampers are divided into squeeze oil film dampers with centering elastic support and without centering elastic support according to whether the journal center and bearing center are concentric when the rotor is not rotating, such as figure 1 Shown is a schematic diagram of the squeeze film damper with elastic support. The Squeeze Oil Film Damper absorbs the vibration energy into heat energy and takes it away by the lubricating oil, which is very effective in reducing the vibration at the critical speed of the rotor and transmitted outward thro...

AI Technical Summary

Problems solved by technology

However, the piezoelectric stack is easily broken when subjected to shear force and torque

Therefore, in the case of high-speed rotation of the rotor system, the environmental adaptability of the device is poor and the service life is short

Moreover, the device needs to bury the piezoelectric stack in the chassis, which is not easy to install and process for general engineering structures

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