Cooling tower resonance detection method

By synchronously collecting the vibration data of the cooling tower and fan through a three-axis vibration sensor and combining spectrum and time domain waveform analysis, the problem of accurate resonance identification during the variable frequency regulation of the cooling tower fan was solved, and efficient resonance detection was achieved.

CN120651337APending Publication Date: 2025-09-16SHANGHAI KING SUN COOLING EQUIP
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Patent Information

Application Number
CN202511018860.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-23
Publication Date
2025-09-16

AI Technical Summary

Technical Problem

Existing technologies are unable to accurately identify resonance phenomena during the variable frequency regulation of cooling tower fans, and suffer from problems such as insufficient frequency scanning accuracy and insufficient data correlation, leading to misjudgment and incomplete modal identification.

Method used

A three-axis vibration sensor is used to synchronously collect vibration data of the cooling tower body and fan. The resonant frequency and excitation source are identified through stepped frequency scanning and spectrum comparison analysis combined with the time domain waveform similarity criterion.

Benefits of technology

It achieves accurate identification of cooling tower resonance, reduces the misjudgment rate and modal missed detection rate, and improves the accuracy and reliability of resonance detection.

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Abstract

The invention provides a cooling tower resonance detection method, which comprises the following steps of S1, arranging a vibration sensor at a preset position of a cooling tower, and collecting a first vibration data set of a cooling tower body; s2, a vibration meter is installed on a fan transmission system, a fan is started, and the operation frequency of a motor is adjusted in a stepping mode; s3, synchronously collecting a second vibration data set of the fan at the corresponding frequency at the adjusting point of each frequency, and recording the second vibration data set as a sequence [b, b,..., bn]; and S4, analyzing the sequence of the first vibration data set and the sequence of the second vibration data set through spectrum comparison, and identifying the characteristic frequency of the fan causing the resonance of the cooling tower from [b, b,..., bn] according to the vibration frequency coincidence degree and the waveform similarity. According to the invention, the resonant frequency is accurately locked by synchronously collecting the response of the tower body structure and the vibration data of the fan excitation source and adopting the stepping frequency scanning and multi-dimensional frequency spectrum comparative analysis technology.
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