Imbalanced-rub-impact coupling fault detection method based on eddy current displacement sensor
A technology of displacement sensor and detection method, which is applied in the testing of machine/structural components, testing of mechanical components, instruments, etc. It can solve problems such as missed diagnosis and weak faults, and achieve the effect of accurate detection
Active Publication Date: 2021-10-19
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology
[0004] The purpose of the present invention is to provide an unbalance-rubbing coupling fault detection method based on eddy current displacement sensing data, so as to solve the problem that the rubbing fault presents weak fault characteristics under unbalance-rubbing coupling faults, and it is characterized by unbalanced The same vibration characteristics of the fault type vibration response characteristics cause the problem of missed diagnosis of weak rubbing faults in coupling faults. This method is conducive to quickly and accurately identifying unbalance-rubbing coupling faults from various fault types
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with examples of implementation.
[0034] Such as figure 1 As shown, the present invention provides an unbalance-rubbing coupling fault detection method based on eddy current displacement sensing data.
[0035] In this embodiment, the first-order rotor system is taken as an example, figure 2 and image 3 They are respectively waveform diagrams and spectrum diagrams of normal, unbalanced, rubbing, and unbalance-rubbing vibration signals of the rotor system used in the specific implementation of the method proposed in the invention. When the vibration signal is collected, the rotating shaft runs at a speed of 1200r / min (20Hz), the sampling frequency is about 1280Hz, and the number of sampling points is 16384. Depend on figure 2 and image 3 It can be seen from the time-domain waveform of the ...
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The invention aims to provide an unbalance-rub-impact coupling fault detection method based on eddy current displacement sensing data so as to solve the problem of missed diagnosis of rub-impact weak faults in rub-impact coupling faults. The displacement vibration signal root-mean-square value RMS provided by the invention can effectively describe the energy change of the vibration signal, and the provided maximum information coefficient MIC can measure the correlation degree and the noise level between the two variables; therefore, compared with other parameters, the numerical distribution of the root-mean-square value RMS and the maximum information coefficient MIC is an outlier of imbalance-rub-impact coupling fault abnormal performance, and an outlier detection model with the root-mean-square value RMS and the maximum information coefficient MIC as multivariate parameters is established. According to the method, the unbalance-rub-impact coupling fault can be quickly and accurately identified from multiple fault types.
Description
technical field [0001] The invention relates to a rubbing coupling fault diagnosis technology of a rotating machinery rotor system based on a vibration signal, in particular to a detection method for an unbalance-rubbing coupling fault based on an eddy current displacement sensor. Background technique [0002] Rotating machinery is the most widely used mechanical equipment in industrial production, such as high-speed compressors, nuclear power units, large turbogenerator sets, centrifugal pumps and other mechanical equipment with the rotor system as the main body of work. The rotor system is the core component of rotating machinery. Faults will affect the service life of the equipment. Rubbing failure is a typical frequent event, and its frequency increases as the seal gap between rotor and stator decreases. There are many reasons for rubbing between static and rotating, such as mass imbalance, misalignment, oil film whirl, relative motion between rotor and stator, etc., wi...
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Login to View More IPC IPC(8): G01H11/02G01M13/00
CPCG01H11/02G01M13/00
Inventor 巩晓赟智泽恒杜文辽王宏超侯俊剑王良文李川
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY