Ultrasonic testing method of thin friction?material layer structure sliding?bearing lubrication?film thickness

A friction material, sliding bearing technology, applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve problems such as thickness measurement of lubricating film of difficult-to-slide bearings, and achieve the effect of expanding the scope of application

Inactive Publication Date: 2014-05-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the reflected echoes are superimposed, the basic stiffness model method can no longer be used to obtain the reflection coefficient of the bearing pad-fluid film interface, so it is difficult to measure the lubricating film thickness of sliding bearings in most cases in practical engineering applications

Method used

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  • Ultrasonic testing method of thin friction?material layer structure sliding?bearing lubrication?film thickness
  • Ultrasonic testing method of thin friction?material layer structure sliding?bearing lubrication?film thickness
  • Ultrasonic testing method of thin friction?material layer structure sliding?bearing lubrication?film thickness

Examples

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Embodiment

[0085] Taking the actual measurement of the lubricating film thickness of a thrust sliding bearing with a 0.5mm thick Babbitt alloy lining as an example, a film thickness simulation device is designed, and a high-precision piezoelectric actuator with closed-loop control is used to generate lubricating film layers of different thicknesses , the film thickness measurement results obtained by the method of the present invention are compared with the feedback thickness of the piezoelectric actuator, which illustrates the effectiveness of the ultrasonic detection method of the present invention. The reflection coefficient of the echo signal at different film thicknesses is measured as Figure 11 As shown, the set film thickness in the figure is the film thickness value displayed by the reading of the closed-loop piezoelectric actuator. According to the reflection coefficient result, the film thickness measurement result obtained from formula (3) is compared with the set film thickn...

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Abstract

The invention discloses an ultrasonic testing method of thin friction?material layer structure sliding?bearing lubrication?film thickness. On the basis that bearing bush-air?interface reference?reflection echo?signals need to be obtained by ?a basic?stiffness?model method, an echo signal?amplitude spectrum of a substrate-liner interface is obtained through a thick-liner bearing bush specimen or theoretical calculation, the frequency domain amplitude ratio of superimposed signals of reference echo and echo of different film thicknesses to the substrate-liner interface echo, the amplitude ratio of the echo component containing film thickness information to the substrate-liner interface echo at one specific frequency position in a superimposed signal spectrum analysis method, reflection?coefficient in the film thickness measurement is obtained and finally the lubrication?film thickness value can be determined. Measurement on fluid lubrication sliding radial and push bearing submicron and micron-class lubrication?film thickness can be realized in the case of reflection echo?signal superimposition.

Description

【Technical field】 [0001] The invention belongs to the fields of industrial equipment operation state monitoring and tribological element design and experimental inspection, and in particular relates to an ultrasonic detection method for the lubricating film thickness of a sliding bearing with a thin friction material layer structure. 【Background technique】 [0002] Sliding bearings are widely used in high-speed, precision, heavy-duty and other occasions, and have become important core components in large-scale thermal power, hydropower units, nuclear power plant main circulation pumps, high-speed precision machine tools and other equipment. Fluid lubricated sliding bearings rely on the fluid lubricating film to separate the bearing bush and the journal surface. The characteristics and state of the lubricating film determine the bearing capacity, running stability and life of the sliding bearing. Therefore, the thickness of the fluid lubricating film, etc. The detection of st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B17/02
Inventor 孟庆丰耿涛张凯袁小阳
Owner XI AN JIAOTONG UNIV
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