Method and system for synchronously measuring and analyzing shaft system torsional vibration and blade vibration of steam turbine

By using distributed sensors and adaptive filter technology, combined with mutual information functions and coupled analysis models, synchronous measurement and correlation analysis of turbine shaft torsional vibration and blade vibration were achieved. This solved the problem of lack of synchronous correlation analysis in existing technologies and improved the accuracy of fault diagnosis and the comprehensiveness of condition assessment.

CN122106696APending Publication Date: 2026-05-29HUANENG SHANTOU HAIMEN POWER GENERATION CO LTD +1
0 Cites 0 Cited by

Patent Information

Application Number
CN202610235948.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In existing technologies, the monitoring methods for turbine shaft torsional vibration and blade vibration lack synchronous correlation analysis, making it impossible to determine the causal relationship and limiting the ability to diagnose and trace faults.

Method used

The shaft rotation signal, key phase pulse signal and blade vibration signal are collected by distributed sensors to form a multi-mode synchronous signal. Noise suppression and correlation analysis are performed, and vibration mode features are extracted by adaptive filter. Combined with mutual information function and coupling analysis model, cross phase relationship and coupling mode features are determined.

Benefits of technology

It enables precise coupled state assessment of turbine shaft torsional vibration and blade vibration, improves the accuracy and reliability of fault diagnosis, enhances users' trust in the intelligent diagnostic system, and provides more comprehensive state assessment results.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a synchronous measurement and analysis method and system for shaft system torsional vibration and blade vibration of a steam turbine, belongs to the technical field of steam turbine generator unit monitoring, and solves the problem that the fault diagnosis and traceability is limited due to the lack of synchronous correlation analysis of shaft system torsional vibration and blade vibration in a traditional separated monitoring mode. The method comprises the following steps: carrying out noise suppression processing and correlation analysis on a multi-mode synchronous signal to obtain a coupling mode characteristic representing a steam turbine shaft system-blade comprehensive state, and carrying out evaluation analysis on the coupling mode characteristic based on a pre-constructed coupling analysis model; according to the method, a self-adaptive filter is used for filtering a blade vibration signal, and a cross modulation spectrum of torsional vibration demodulation time sequence information and a vibration mode characteristic component is determined based on a mutual information function, so that a cross phase relation at a sampling point is accurately determined, and a coupling mode characteristic representing a steam turbine shaft system-blade comprehensive state is obtained; and the overall operation state of the steam turbine can be reflected more comprehensively and accurately.
Need to check novelty before this filing date? Find Prior Art