Dynamical pressure gas elasticity foil tablet bearing with stability self-adaptive control function

Abstract

The invention relates to a dynamic gas elastic foil bearing with stability and adaptive control functions, comprising a bearing casing, a plurality of bearing pads, an elastic foil, and a piezoelectric ceramics micro displacement actuator. The dynamic gas elastic foil bearing is characterized in that the bearing pads are uniformly distributed along the inner wall of the bearing casing; the bearing pads are welded with a bottom bump foil and one end of a top foil; the other end of the top foil is lapped over an adjacent top foil, wherein the piezoelectric ceramics micro displacement actuator with one end fixed on a set screw and the other end arranged on a jig is connected with two bearing pads; the piezoelectric ceramics micro displacement actuator is connected with a feedback controller PID; an input of the feedback controller PID is connected with an eddy current displacement sensor. The dynamic gas elastic foil bearing with stability and adaptive control functions has the advantages of strengthened equivalent rigidity and equivalent damping of the elastic foil, restrained vibration of rotor system, improved bearing capacity and stability of the bearing, reduced size and structure, increased control precision of displacement, and quickened response speed.

Description

technical field [0001] The invention relates to a bearing, in particular to a dynamic pressure gas elastic foil bearing with a stability self-adaptive adjustment function. Background technique [0002] At present, the dynamic pressure gas elastic foil bearing has been developed to the fourth generation. It is composed of multiple bottom arch foils and smooth top foils. The bottom arch foil adopts the form of axial strips, which increases the structural damping of the bearing and effectively The load carrying capacity of the bearing is improved, and the high-temperature metal wear-resistant coating and pre-tightening assembly technology are introduced, so that the bearing has good adaptability and can operate in extreme environments such as high temperature and high speed. However, when this kind of bearing operates at a speed more than twice the natural frequency of the rotor, there is still inherent gas dynamic pressure instability, which seriously affects the use of this k...

AI Technical Summary

Problems solved by technology

However, this adjustable mechanism has certain limitations. The system vibration can only be controlled passively by adjusting the screw-in amount of the cylindrical plug, and the active control and self-adaptive adjustment of the system vibration cannot be realized.

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