An Early Fault Diagnosis Method for Space Bearings Based on Kurtosis Index and Envelope Spectrum
A technology for early failure and diagnosis methods, applied in the testing of mechanical parts, the testing of machine/structural parts, instruments, etc., can solve problems such as failure to diagnose the cause of bearing failures, failure of spacecraft, and affecting the main functions of space moving parts, etc. Achieving the effect of increasing longevity, reliability and accuracy
Active Publication Date: 2022-04-12
BEIJING INST OF CONTROL ENG
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Problems solved by technology
If the shaft system with such early failures is installed into the space active components, or even delivered to the final assembly for final launch, and if a failure occurs after orbital operation, it will seriously affect the main functions of the space active components, and even cause the spacecraft to fail and be scrapped. The consequences are incalculable
[0005] (2) The space inertial actuator is a complex electromechanical system. In addition to the bearing, there are a series of rotating and control components. The factors causing the current change are relatively complicated, and sometimes it is the result of the combined effect of various factors. Therefore, the bearing fault is detected only by the current. identification, it is impossible to make a scientific and reasonable diagnosis of the cause of bearing failure
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[0070] Such as Figure 5 As shown, the kurtosis index of the vibration time-domain signal of a certain flywheel bearing is 3.82, the envelope spectrum after spectrum averaging, the frequency f of the ball passing through the outer ring out , frequency division 0.5f out The amplitude of is dominant, so it can be diagnosed that there is damage to the outer ring of the bearing. The product was disassembled to confirm that there is damage to the outer ring groove, which is consistent with the positioning conclusion.
[0071] The above embodiments have fully demonstrated that the fault diagnosis method proposed by the present invention can not only identify the early faults of the space bearing, but also realize the fault location of the bearing without dismantling the product. On the one hand, the faulty bearing can be identified and located in time, and effective remedial measures can be taken to avoid unnecessary scrapping of the shafting system; The occurrence of serious acc...
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The invention relates to a method for early fault diagnosis of space bearings based on kurtosis index and envelope spectrum. By analyzing the kurtosis index and envelope spectrum, the state of space bearing is evaluated, and the early fault diagnosis of the bearing is realized without dismantling the bearing. Especially by identifying the characteristic frequency of the bearing fault in the envelope spectrum, the bearing fault location can be realized. On the one hand, the faulty bearing can be identified and located in time, and effective remedial measures can be taken to avoid unnecessary scrapping of the shafting system; The occurrence of serious accidents such as performance deterioration and even spacecraft failure has important economic and social values.
Description
technical field [0001] The invention relates to an early fault diagnosis method for a space bearing based on a kurtosis index and an envelope spectrum, and belongs to the technical field of fault diagnosis. Background technique [0002] Space inertial actuators represented by flywheels and control moment gyroscopes are key components for attitude control and precision maintenance of various spacecraft. As one of the core components of the space inertial actuator, the bearing provides a stable slewing support and has the characteristics of high rotation accuracy, high precision level, high stability and long life. Once the bearing fails, it will seriously affect the realization of the function of the space inertial actuator, and even cause the spacecraft to fail. Therefore, in the ground development stage of space inertial actuators, a simple and effective method is adopted to identify bearings with early failures, so as to avoid delivery of space inertial actuators with ear...
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IPC IPC(8): G01M13/045
CPCG01M13/045
Inventor 王虹刘红星张绍卫隗乐乐王晗卿涛张激扬吴博周刚冯洪伟
Owner BEIJING INST OF CONTROL ENG