Supersonic wave based air film thickness measuring system and method of airfoil bearing
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: 2019-02-22
HUNAN UNIV
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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
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[0028] The specific embodiments of the present invention, such as the structure of each part involved, the mutual position and assembly relationship between each part, the function of each part and the specific working principle, are further described in detail below with reference to the accompanying drawings and specific embodiments. However, it should be understood that the following specific embodiments are only the preferred technical solutions of the present invention, and should not be construed as limiting the present invention.
[0029] like Figure 1-2 As shown, an ultrasonic-based air foil bearing air film thickness measurement system and method specifically includes 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 transmitter and receiver, multi-channel data acquisition instrument, host computer.
[0030] like image 3 As shown in -4, an ultrasonic-based a...
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The invention discloses a supersonic wave based air film thickness measuring system and method of an airfoil bearing, and relates to the technical field of air bearings. The system comprises a currentvortex displacement sensor, a supersonic wave emitting and receiving device, a hydrogel layer and a signal processing device; and the air film thickness of the airfoil bearing can be monitored in real time in a lossless way. The current vortex displacement sensor measures displacement of a rotor in the two vertical directions, and calculates an axial center track of the rotor; the supersonic waveemitting and receiving device emits and receives a supersonic signal reflected by the hydrogel layer, and transmits data to the signal processing device; the signal processing device analyzes and stores the data to obtain an elastic deformation amount of a support layer measuring point of the airfoil bearing; and the air film thickness of the measurement point is obtained according to the axial center track of the rotor and the elastic deformation amount of the support layer measuring point. According to the system and method, supersonic wave measurement is introduced, hydrogel is combined with the airfoil bearing, and the air film thickness of the airfoil bearing is measured in a non-invention way.
Description
technical field [0001] In general, the present invention relates to the technical field of air bearings, and more particularly, to a novel measuring system and method for the thickness of air film of an air foil bearing based on ultrasonic waves. Background technique [0002] Air foil bearings have many advantages such as high speed, long life, oil-free lubrication, compact structure, etc., and are considered to be ideal products to replace conventional oil film lubricated rolling bearings and sliding bearings under high temperature and high speed conditions. Due to their high machining accuracy and high load-carrying capacity, air foil bearings are widely used in high-speed rotating equipment in critical fields such as aerospace and defense. [0003] A typical air foil bearing usually consists of a three-layer structure of bearing sleeve, corrugated foil and top foil. The support layer composed of the corrugated foil and the top foil enables it to be adaptively adjusted ac...
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IPC IPC(8): G01B17/02
CPCG01B17/025
Inventor 张凯朱炳辉冯凯
Owner HUNAN UNIV