Unbalance-rubbing 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: 2022-07-26
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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[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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[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the implementation cases.
[0035] like figure 1 As shown, the present invention provides an unbalance-rubbing coupling fault detection method based on eddy current displacement sensing data.
[0036] In this embodiment, a first-order rotor system is taken as an example, figure 2 and image 3 They are the waveform diagram and the frequency spectrum diagram of the normal, unbalanced, rubbing, and unbalanced-rubbing vibration signals of the rotor system used when the method proposed in the invention is specifically implemented. 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 t...
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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 of missed diagnosis of weak rubbing faults in rubbing coupling faults. The root mean square value RMS of the displacement vibration signal provided by the present invention can effectively describe the energy change of the vibration signal, and the maximum information coefficient MIC provided can measure the degree of correlation between the two variables and its noise level, so the root mean square value RMS and the maximum Compared with other parameters, the numerical distribution of the information coefficient MIC is an outlier of the abnormal performance of the unbalance-rubbing coupling fault. An outlier detection model with the root mean square value RMS and the maximum information coefficient MIC as the multivariate parameters is established. This method is beneficial to quickly and accurately identify unbalance-rubbing coupling faults from various fault types.
Description
technical field [0001] The invention relates to a rubbing coupling fault diagnosis technology of a rotating machinery rotor system based on vibration signals, in particular to a method for detecting unbalance-rubbing coupling faults 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 turbo-generator units, centrifugal pumps and other mechanical equipment with rotor systems as the main body of work. If it fails, it will affect the service life of the equipment. The rubbing failure is a typical multiple event, and its frequency increases with the reduction of the sealing gap between the rotating and stator. There are many reasons for the rub-impact of the rotating and static state. Mass unbalance, misalignment, oil film whirl, and relative motion between the rotating and stator will all cause the system to...
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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