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The Study of the Diagnosis Method for Aerospace Bearings’ Faults and the Development of the Software System

Author: LiJunJuan
Tutor: YangBoYuan
School: Henan University of Science and Technology
Course: Mechanical Design and Theory
Keywords: Friction torque Fault Diagnosis Aerospace bearings Software Development
CLC: TH165.3
Type: Master's thesis
Year: 2011
Downloads: 72
Quote: 0
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Abstract


Aerospace bearing friction torque requirements of the highest class bearings. Wherein the gyroscope frame sensitive starting frictional torque and dynamic friction torque of the size of the bearing as well as the stability of the indication of the accuracy and stability of the gyroscopic instrument plays an important role, and thus also plays an important role in the control system performance and spacecraft safety . For miniature spacecraft bearing in terms of sensitivity, inside and outside the ring channel roundness, roughness, grinding, wire flow, radial clearance and channel shape processing defects and surface scratches will affect the bearing of starting and running torque \Therefore, through research and analysis, the use of a variety of effective methods for the diagnosis of the aerospace bearing failure caused by these factors is very necessary for improving the quality of the aerospace bearing protect the life and reliability of the spacecraft, and to reduce the economic losses have significant practical significance. In view of the important role of the bearing friction torque sensitive gyroscope framework working conditions, this article dynamic frictional torque tester of LSD-I collected two models of such dynamic bearing friction torque waveform chart, bad internal outer ring channel shape, the inner ring roundness bad, bad inner ring roughness, the grinding wire flow inside and outside the ring and single defects corresponding friction torque waveform analysis. Fourier transform, wavelet analysis and statistical and other mathematical tools domain frequency domain analysis, probability density function, power spectrum analysis, the calculation of the envelope spectrum analysis as well as other parameters, trying to find the waveform characteristics for a variety of defects, to arrive at a preliminary diagnosis process defects criterion aerospace bearing friction torque characteristics and effective diagnostic method. Last preliminary do with LabVIEW software fault diagnosis system development, and validation. Aerospace bearing friction torque is influenced by many factors, and covers a wide range, randomness is relatively strong, complex interactions, and are extremely sensitive to environmental conditions, is a very difficult subject. This article is made on the basis of previous studies, further research and analysis, initially identified an effective method for the diagnosis of such sensitive bearing a single defect, and software development system, which is based on the friction torque aerospace The in-depth study of the bearing fault diagnosis foundation.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Machinery Manufacturing Technology > Flexible manufacturing systems and flexible manufacturing cell > Fault diagnosis and maintenance
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