Method and system for measuring extremely-low-frequency vibration by low-frequency vibration sensors, terminal equipment and readable storage medium

Abstract

The invention discloses a method and system for measuring extremely-low-frequency vibration through low-frequency vibration sensors, terminal equipment and a readable storage medium. The method comprises the following steps: actually measuring the amplitude-frequency characteristic and the phase-frequency characteristic of each extremely-low-frequency vibration sensor in an extremely-low frequencyband (such as 0.35-6 Hz) ; actually measuring and obtaining a time domain oscillogram of extremely-low-frequency vibration by using the low-frequency vibration sensors; carrying out spectral analysison the time domain oscillogram in the specified time period to obtain a spectral characteristic value of the time domain oscillogram; correcting the frequency spectrum characteristic value of the actually measured extremely-low-frequency vibration by using the frequency response characteristic of the extremely-low-frequency band of the sensor; and generating a group of fundamental frequency and frequency doubling sine waves by using the corrected frequency spectrum characteristic values, and superposing the fundamental frequency and frequency doubling sine waves on phases to obtain a corrected extremely-low-frequency vibration time domain oscillogram, thereby realizing accurate measurement, analysis, calculation and storage of extremely-low-frequency vibration. According to the invention,the technical problems of large error, untrusted data and the like during measurement of extremely-low-frequency vibration in the prior art are solved, and the reliability and accuracy of measurementof extremely-low-frequency vibration are improved.

Description

technical field [0001] The invention relates to the field of vibration measurement of hydraulic units, in particular to a method, a system, a terminal device and a readable storage medium for measuring extremely low-frequency vibration by a low-frequency vibration sensor. Background technique [0002] With the increase of society's demand for electricity and the improvement of people's awareness of environmental protection, the importance of hydropower has gradually increased. The hydropower reserves of my country's rivers reach 680 million kilowatts. At present, 340 million kilowatts of developed installed capacity have been developed, and the annual power generation capacity is 1.2 trillion kilowatt-hours. [0003] At present, my country has built more than 47,000 small hydropower stations with an installed capacity of less than 50,000 kilowatts, with a total installed capacity of about 79.27 million kilowatts; 479 medium-sized hydropower stations with an installed capacit...

AI Technical Summary

Problems solved by technology

However, when the existing technology center tests the vibration of the hydraulic unit, the accuracy of the detection of low-frequency or even extremely low-frequency vibration signals is not satisfactory, and the operating status of the hydraulic unit cannot be effectively monitored. The stability of the hydraulic unit during operation has a great adverse effect

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