Wireless Magnetostrictive Testing via Ferromagnetic Patch
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Solution Overview
Problem
Conventional magnetostrictive (MS) testing methods require wired probes for applying magnetic fields, which limits their applicability due to access issues and engineering challenges, especially when multiple probes are needed.
Innovation Solution
A wireless MS method using a ferromagnetic patch to pre-magnetize the material and apply an AC current directly to the material under test, generating guided waves that can detect anomalies without wired probes, utilizing the reversed Wiedemann effect for transverse vibrations and the Joule effect for longitudinal vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wired MS probes are used to apply magnetic fields and receive signals, then the MS monitoring method can be implemented, but the applicability is limited due to access issues and wiring challenges
Solution Approach 1:
The patent extracts the magnetic field generation function from the wired probe structure and implements it directly through the ferromagnetic material under test. By applying AC current directly to the material, the material itself generates the magnetic field via the Wiedemann effect, eliminating the need for external wired coils and probes.
Solution Approach 2:
The ferromagnetic material under test serves dual purposes: it is both the object being tested and the means for generating magnetic fields. The material's own electrical conductivity and ferromagnetic properties are utilized to create the necessary magnetic fields for MS testing, making the system self-sufficient without external wiring.
2Reliability
If multiple wired probes are deployed for comprehensive monitoring, then detection coverage is improved, but engineering challenges and installation difficulty increase
Solution Approach 1:
The patent makes the ferromagnetic material itself multi-functional by using it both as the structure under test and as the magnetic field generator. This universal approach eliminates the need for separate probe systems, allowing comprehensive monitoring without additional installation complexity.
Solution Approach 2:
The patent replaces the mechanical wired probe system with an electrical field-based approach. By using electromagnetic induction and the Wiedemann effect, the system substitutes physical contact probes with field-based measurement, simplifying installation while maintaining detection capability.
3Adaptability or versatility
If wired probes are used in locations with limited access, then MS monitoring can be performed, but the complexity of placing and wiring probes increases
Solution Approach 1:
The patent removes the external wiring and probe components from the measurement system. By utilizing the material's inherent properties to generate magnetic fields, the system eliminates the need to physically place and wire probes in difficult-to-reach locations.
Solution Approach 2:
The material under test performs the function of generating magnetic fields itself through its ferromagnetic and conductive properties. This self-service capability allows monitoring in limited access areas without requiring physical probe insertion or complex wiring in difficult locations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables effective detection of structural anomalies without the need for wired probes, allowing for remote activation and increased flexibility in monitoring complex structures, with improved signal strength and efficiency compared to conventional methods.
Implementation Method 1
a permanent magnetic field is used to give the domains a preferred orientation (bias)
Implementation Method 2
The principle of magnetostriction is based on either shifting or oscillation/rotation between magnetic domains in the material due to applied magnetic fields
Implementation Method 3
Variable magnetic fields are also applied to initiate rotation of the domains causing dimensional changes
Implementation Method 4
The principle of magnetostriction is based on either shifting or oscillation/rotation between magnetic domains in the material due to applied magnetic fields. Depending on the mutual orientation (in-plane or out-of-plane) and on the mutual magnitude of the magnetic fields, oscillation of domains can produce longitudinal or transverse vibrations within the material being tested
Implementation Method 5
utilizing the reversed Wiedemann effect for transverse vibrations and the Joule effect for longitudinal vibrations
Implementation Method 6
utilizing the reversed Wiedemann effect for transverse vibrations
Data Source
AI summary
A method of magnetostrictive (MS) guided wave testing of a ferromagnetic structure. One or more MS transmitters, each configured as a patch of ferromagnetic material, are acoustically coupled to the structure. Each MS transmitter is magnetized to produce a bias magnetic field in the patch. One or more MS receivers are acoustically coupled to the structure in a location remote from the MS transmitter(s). An alternating current (AC) is applied to the structure, thereby producing time-varying magnetic fields and MS vibrations in the MS transmitter(s) resulting in guided waves in the structure. MS response signals are received at the MS receiver(s), indicating whether the structure has any anomalies.