A double frequency fault detection method and system for rotating machinery based on axis trajectory
A shaft center track and fault detection technology, which is applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve the problem of double frequency faults that cannot be deeply analyzed and identified, and there is no double frequency axis Heart trajectory vibration analysis and other issues, to shorten the troubleshooting time, avoid unit maintenance, improve the accuracy of fault identification and fault handling efficiency
Active Publication Date: 2017-02-15
XIAN SHAANGU POWER
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Problems solved by technology
But so far, there is no method for vibration analysis based on double-frequency axis trajectory, and it is impossible to conduct in-depth analysis and judgment on the cause of some double-frequency faults.
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[0076] The method of the present invention has achieved very obvious effects through the application in the industrial field. Here, taking the inventor's application during the test run of an 80,000 air separation unit of a large domestic rotating machinery manufacturer as a case, the application process of the patent is shown. The air compressor model in this embodiment is EIZ160-4. It should be noted that the purpose of this embodiment is to explain the specific implementation of the present invention in more detail, and the scope of protection claimed by the present invention is not limited to this embodiment.
[0077] The above-mentioned EIZ unit started its in-plant test run on January 4, 2014, and the vibration of multiple test runs was high. In addition to the power frequency, the double frequency was more obvious (see Figure 5 ). The reason for the formation of the double frequency is always considered to be caused by poor alignment. Recall the double frequency axis tra...
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The invention discloses a rotary machine second harmonic generation fault detecting method and system based on a shaft center orbit. The rotary machine second harmonic generation fault detecting method includes the following steps: (1) rotary machine vibration data are detected through two perpendicular probes, and the step (2) is executed if second harmonic generation components in the vibration data detected by any probe is larger than or equal to 10 micrometers; (2) second harmonic generation data in the vibration data detected by the two probes are synthesized into the oval second harmonic generation shaft center orbit, the eccentricity of the second harmonic generation shaft center orbit is calculated, and causes of vibration are obtained according to the eccentricity. By means of the method, the problems of poor centering and the excessively-large vibration testing belt swing degree can be visually, rapidly and accurately distinguished, specific second harmonic generation failure causes are accordingly judged rapidly and accurately, and quantization analysis on influences of the two failures on vibration is carried out; in this way, the unit failure troubleshooting time is effectively shortened, an engineer is prevented from overhauling and maintaining units in an aimless mode, and the failure recognition accuracy and the failure processing efficiency are improved.
Description
Technical field [0001] The invention belongs to the technical field of equipment state monitoring, and in particular relates to a method and system for detecting a double frequency fault of a rotating machine based on an axis track. Background technique [0002] In the operation of rotating machinery, the causes of various faults are very complicated. A considerable part of these faults are caused by large double-frequency vibration. In double-frequency faults, poor alignment takes up a large proportion. In addition, vibration measurement Too big is sometimes expressed as double frequency. There is a big difference between the two troubleshooting methods. If the judgment is wrong, it will not only waste manpower and material resources, but also prolong equipment maintenance time, which will seriously affect equipment production. How to accurately distinguish these double frequency faults and then take correct countermeasures is always one of the important research topics in the ...
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IPC IPC(8): G01M13/00G01M7/02
Inventor 鹿守杭金颖郎博袁博
Owner XIAN SHAANGU POWER