Piezoelectric stack-based vibration reduction ring device

Abstract

The invention discloses a piezoelectric stack-based vibration reduction ring device, and belongs to the field of design for vibration reduction devices. The vibration reduction ring device comprises an inner ring, an outer ring, an inner ring end cover, an outer ring end cover, piezoelectric stacks and butterfly-shaped connection elements, wherein one piezoelectric stack is connected to the longitudinal symmetry axis of each butterfly-shaped connection element; the butterfly-shaped connection elements are uniformly distributed in aligned grooves between the inner ring and the outer ring; and the inner ring end cover and the outer ring end cover are further arranged at the upper ends of the inner ring and the outer ring separately. According to the novel vibration reduction ring design disclosed by the invention, the vibration reduction ring is capable of effectively reducing vibration transferred to supporting by a transmission system through a shaft and a bearing by virtue of a piezoelectric shunt damping technology, and capable of effectively preventing the piezoelectric stacks from bearing tangential stress and torque, thereby prolonging the service lives of the piezoelectric stacks.

Description

technical field [0001] The invention belongs to the design field of vibration damping devices, and specifically refers to a vibration damping ring device based on piezoelectric stacking. 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. For example, in the research by Zhang Jiazhong and other scholars, a squeeze oil film damper with elastic support is provided (Zhang Jiazhong, Zheng Tiesheng, Liu Shixue, etc. Stability and analysis of squeeze oil film damper-sliding bearing-rigid transmission system Fork behavior. Acta Applied Mechanics, 1996,13(4):35~40). The Squeeze Oil Film Damper absorbs the vibration energy into heat energy and takes it away by the ...

AI Technical Summary

Problems solved by technology

[0003] However, the disadvantages of the squeeze film damper are: due to the high nonlinearity of the oil film stiffness, the squeeze film damper may lock up, bistable and uncoordinated precession during the working process, and the transmission system vibrates too much and even produces fatigue and crash

Moreover, drilling holes at the support will affect the strength and rigidity of the structure, so although it has the effect of damping vibration, it may make the structure unable to perform its normal functions and functions.

Second, the piezoelectric stack can withstand large stresses in the polarization direction, but cannot withstand excessive shear forces and torques

Obviously, in this environment, the reliability and service life of the piezoelectric stack are difficult to guarantee

Third, installing the piezo stack in this way does not guarantee interchangeability and standardization of parts

There are only four piezoelectric stacks distributed around the drive shaft, so it is difficult to produce a uniform vibration damping effect; and the vibration damping measures need to be installed in the box, which limits its use

Piezoelectric stacks break easily when subjected to shear 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

Images