Novel active air foil bearing based on PZT and SMA

A foil bearing, active technology, applied in the direction of shafts and bearings, sliding contact bearings, bearing components, etc., can solve the problems of applying preload, small mechanical deformation, etc., to improve stiffness characteristics, increase structural damping, and improve damping The effect of the characteristic
CN111457007AInactive Publication Date: 2020-07-28HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN UNIV
Publication Date
2020-07-28
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a novel active air foil bearing based on PZT and SMA. The novel active air foil bearing comprises a shaft sleeve, piezoelectric ceramics (PZT), a memory alloy wire mesh block (SMA block), flexible hinges, a rigid push rod, pre-pressure applying devices, a cooling pipe, a wave foil and a top foil; the PZT and the SMA block are installed in pre-machined through grooves, the corresponding pre-pressure applying devices are designed for the PZT and SMA block, the wave foil is formed by pressing an elastic material, one end of the wave foil is welded, and the other end of thewave foil is free. The top foil overlies the wave foil. Power supply signals of the PZT are controlled, the flexible hinges are coupled, PZT deformation is amplified, the wave foil is supported by the rigid push rod, the wedge-shaped space is enlarged, therefore, the crossed coupling effect is weakened, the dynamic pressure effect of the bearing is enhanced, and the rigidity characteristic of thebearing is improved; by controlling the temperature of the SMA block, the SMA block expands and contracts to generate larger structural damping, and the damping characteristic of the bearing is improved; and finally, the rigidity and damping characteristics of the bearing are actively controlled, and the stability of the system is improved.
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Description

technical field

[0001] The invention relates to the technical field of air bearings, in particular to a novel active air foil bearing based on PZT (piezoelectric ceramics) and SMA (shape memory alloy). Background technique

[0002] The air foil bearing is composed of the top foil, the wave foil and the shaft sleeve. It uses the relative motion between the rotating rotor and the bearing to generate a wedge-shaped space to squeeze the gas with a certain viscosity to form a pressure with a certain stiffness and damping. The stiffness and damping of the aerodynamic pressure bearing supported by the lubricating air film are determined by the series connection of the bearing structure and the lubricating air film.

[0003] The traditional air foil bearing supports the loaded rotor through the wedge effect, and the high-speed rotation of the rotor squeezes the gas to generate a dynamic pressure effect; the elastic foil is used as a supporting structure to provide a certain stiffnes...

Claims

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