Forked type piezoelectric stack damping ring

Abstract

The invention provides a forked type piezoelectric stack damping ring which comprises piezoelectric stacks, a forked type protection frame, an outer ring and an external shunt circuit, wherein the forked type protection frame is arranged on a bearing in a sleeving manner, the outer ring is arranged on the forked type protection frame in a sleeving manner and is fastened on the forked type protection frame; the forked type protection frame is of a symmetrical annular structure with a concave cross section; a plurality of piezoelectric stacks are distributed between an inner wall and an outer wall of a notch with the concave shape structure; two end faces of each of the piezoelectric stacks are respectively bonded on the inner wall and the outer wall of the notch; the polarization directionof each of the piezoelectric stacks is identical as the pressure load direction of the bearing received by the forked type protection frame; and all the piezoelectric stacks access an external circuitafter being connected in parallel, and are connected in series with a resistor and an inductor. With adoption of the forked type piezoelectric stack damping ring, vibration of a drive system transmitted to a support through a shaft and the bearing can be effectively reduced through a piezoelectric shunt damping technology, a tangential stress and a torque born by the piezoelectric stacks can be effectively avoided, and the service life of the piezoelectric stacks can be prolonged.

Description

technical field [0001] The invention relates to the field of vibration damping devices, which act on bearings and bearing seats or mechanical boxes in rotor systems in the aviation field, in particular a fork-shaped piezoelectric stack vibration damping ring. 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 through the bearing. Squeeze oil...

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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