Device and method for measuring the nonlinear coefficient and attenuation coefficient of surface waves on main beams

By designing a magnetically connected piezoelectric surface wave transducer and a dual-electrode piezoelectric thin film sensor excitation and receiving device, the problem of online measurement of fatigue damage state of crane main beam was solved, achieving stable measurement of nonlinear coefficient and attenuation coefficient, reducing cost and improving measurement accuracy.

CN121364247BActive Publication Date: 2026-03-10TIANJIN SPECIAL EQUIP INSPECTION INST
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Patent Information

Application Number
CN202511954699.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-23
Publication Date
2026-03-10
Estimated Expiration
2045-12-23

AI Technical Summary

Technical Problem

Existing technologies make it difficult to achieve online measurement of fatigue damage state of crane main beams, especially accurate measurement of nonlinear coefficient and attenuation coefficient of surface waves. Furthermore, traditional piezoelectric transducers have low efficiency and unstable measurement results, while foreign equipment is expensive.

Method used

A piezoelectric surface wave transducer and a dual-electrode piezoelectric thin film sensor with magnetic attraction were designed, combined with insulating layer encapsulation and magnet fixation, to create an excitation and receiving device. A narrow-band transducer and a wide-band sensor were connected in parallel to avoid coupling effects and adapt to the working environment of cranes.

Benefits of technology

Stable measurement of surface wave nonlinear coefficient and attenuation coefficient has been achieved, reducing equipment costs, improving measurement accuracy and reliability, adapting to the working environment of cranes, and avoiding the influence of external factors.

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Abstract

This invention discloses a measuring device and method for detecting the nonlinear coefficient and attenuation coefficient of surface waves on a main beam, relating to the technical field of cranes. It solves the problem of difficulty in online measurement of fatigue damage state assessment parameters for crane main beams. The device includes: a piezoelectric surface wave transducer and two dual-electrode piezoelectric thin-film sensors, both pressed firmly onto the surface of the steel plate to be tested; the dual-electrode piezoelectric thin-film sensor closer to the piezoelectric surface wave transducer is designated as sensor number one, and the dual-electrode piezoelectric thin-film sensor farther from the transducer is designated as sensor number two; the piezoelectric surface wave transducer is used to excite surface waves, and sensors number one and two are used to receive surface waves. In this invention, the measuring device is fixed using magnets, making it easy to install and remove, reliably fixed, and compact, adaptable to the working environment of cranes.
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