Zero-intervention blade tip timing sensing method and measurement system

By sensing blade events through a composite electromagnetic field of low-frequency AC excitation and strong magnetic bias, the problem of requiring holes in traditional blade tip timing technology is solved, and high-precision blade vibration measurement is achieved without damaging the casing structure. This method is applicable to aero-engines and gas turbines.

CN122171012APending Publication Date: 2026-06-09CHINA UNIV OF MINING & TECH
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Patent Information

Application Number
CN202610300734.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-12
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing blade tip timing technology requires openings in the casing, which compromises structural integrity, aerodynamic performance, and safety. Furthermore, high-frequency electromagnetic sensing methods are difficult to penetrate metal casings, resulting in weak signals and high noise, making it difficult to achieve reliable blade vibration measurement.

Method used

A composite electromagnetic field combining low-frequency AC excitation and strong magnetic bias is used to sense blade events through the outside of the metal casing. The penetrating power of the low-frequency electromagnetic field is used to form a composite magnetic field on the outside of the casing to sense the magnetic field disturbance caused by the blade passing event. The disturbance is converted into a voltage signal by an external sensing element, and a physical mapping model is established for signal processing to extract the blade arrival time.

Benefits of technology

It enables reliable measurement of blade vibration without openings, maintains the structural integrity of the casing, improves signal sensitivity and measurement accuracy, and is applicable to various metal casing materials and rotating blade systems.

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Abstract

The invention discloses a zero-intervention blade tip timing sensing method and a measuring system, and belongs to the technical field of rotating machinery vibration testing. The method comprises the steps that S1, the electromagnetic sensing device is arranged on the outer side of the metal casing; s2, applying low-frequency alternating-current electromagnetic excitation, and overcoming electromagnetic shielding of the casing by utilizing the penetrating power of a low-frequency field; s3, introducing a permanent magnet to form a strong magnetic bias field; s4, composite magnetic field modulation change is caused when the blades sweep through, and the composite magnetic field is transmitted to the outer side through a cartridge receiver electromagnetic diffusion channel; s5, the externally-attached sensing element senses the magnetic flux change and converts the magnetic flux change into an induced voltage signal; and extracting a leaf arrival time sequence through signal processing. The method does not need casing trepanning, meets the requirement of structural integrity, has the advantages of strong penetration, high sensitivity, correctability and the like, and is suitable for blade end timing measurement and vibration monitoring of high-speed rotating blade systems such as aero-engines and gas turbines.
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