An ultrasonic-based air foil bearing air film thickness measurement system and method

A foil bearing and thickness measurement technology, which is applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problem of not being able to obtain the value of the gas film thickness, and achieve the effect of improving application capabilities and measurement data

Active Publication Date: 2021-11-05
HUNAN UNIV
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Problems solved by technology

Unfortunately, due to the huge difference in acoustic impedance between the metal medium and the air medium, no matter how thick the air film is, the reflected signal of the ultrasonic wave on the air film layer is almost the same, and it cannot Feature Get Air Film Thickness Value

Method used

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  • An ultrasonic-based air foil bearing air film thickness measurement system and method
  • An ultrasonic-based air foil bearing air film thickness measurement system and method
  • An ultrasonic-based air foil bearing air film thickness measurement system and method

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Embodiment Construction

[0028] The specific implementation of the present invention, such as the structure of each part involved, the mutual position and assembly relationship between each part, the function and specific working principle of each part, etc., will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. However, it can be understood that the following specific embodiments are only preferred technical solutions of the present invention, and should not be construed as limiting the present invention.

[0029] Such as Figure 1-2 As shown, a system and method for measuring the air film thickness of an air foil bearing based on ultrasonic waves, specifically including a bearing sleeve 1, a hydrogel layer 2, a corrugated foil 3, a top foil 4, an ultrasonic sensor 5, and two eddy current sensors 6 , Rotor 7, ultrasonic pulse transmitting and receiving instrument, multi-channel data acquisition instrument, upper computer.

[0030] Such as ...

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Abstract

The invention relates to the technical field of air bearings, and discloses an ultrasonic-based air foil bearing air film thickness measurement system and method, including an eddy current displacement sensor, an ultrasonic transmitting and receiving device, a hydrogel layer and signal processing equipment, and the air foil Real-time non-destructive monitoring of the air film thickness of the disc bearing. The eddy current displacement sensor measures the displacement of the rotor in two vertical directions, and calculates the axis trajectory of the rotor; the ultrasonic transmitting and receiving device transmits and receives the ultrasonic signal reflected by the hydrogel layer, and transmits to the The signal processing equipment transmits data; the signal processing equipment analyzes and stores the signal data to obtain the elastic deformation of the air foil bearing support layer measurement point; according to the rotor axis track and the elastic deformation of the support layer measurement point, the measurement point is obtained. Air film thickness. The invention realizes the non-intervention measurement of the air film thickness of the air foil bearing by introducing ultrasonic measurement and combining the hydrogel and the air foil bearing.

Description

technical field [0001] Generally speaking, the present invention relates to the technical field of air bearings, and more specifically, relates to a novel measurement system and method for air film thickness of air foil bearings based on ultrasonic waves. Background technique [0002] Air foil bearings have many advantages such as high speed, long life, oil-free lubrication, and compact structure. They are considered to be ideal products for replacing conventional oil film lubricated rolling bearings and sliding bearings under high temperature and high speed conditions. Due to high machining accuracy and high load capacity, air foil bearings are widely used in high-speed rotating equipment in key fields such as aerospace and defense. [0003] A typical air foil bearing usually consists of a three-layer structure of bearing housing, corrugated foil and top foil. The supporting layer formed by the corrugated foil and the top foil enables adaptive adjustment according to the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B17/02
CPCG01B17/025
Inventor 张凯朱炳辉冯凯
Owner HUNAN UNIV
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