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A novel optimization method for transducer array in Lamb wave detection of variable cross-section structures.

Ziwei Fang1, Chenjun Gao2, Xuefei Guan3

  • 1School of Reliability and Systems Engineering, Beihang University, Beijing 100191, China; Advanced Manufacturing Center, Ningbo Institute of Technology, Beihang University, Ningbo 315800, China.

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Summary
This summary is machine-generated.

This study introduces an efficient method for optimizing Lamb wave transducer placement in complex aerospace structures. The approach enhances structural health monitoring (SHM) by improving wave energy focusing and detection performance.

Keywords:
Array optimizationDynamic simulationLamb waveMoment quadrature methodVariable cross-section waveguide

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Area of Science:

  • Aerospace Engineering
  • Materials Science
  • Mechanical Engineering

Background:

  • Complex cross-section structures are vital in aerospace, necessitating effective structural health monitoring (SHM).
  • Lamb wave-based SHM faces challenges due to geometric complexity affecting dispersion and transducer arrangement.
  • Existing methods like phased arrays can be complex and costly for in-situ monitoring.

Purpose of the Study:

  • To develop an efficient optimization method for flexible Lamb wave transducer array placement.
  • To address challenges in dispersion calculation and energy focusing for SHM in complex geometries.
  • To validate the proposed method on a real titanium alloy engine fan blade.

Main Methods:

  • Utilizing the moment quadrature method for generating representative sparse samples.
  • Employing an improved semi-analytical finite element (SAFE) method with continuous cross-sections mapping for dispersion analysis.
  • Conducting dynamic simulations to study wave motion and optimize parameters for wave focusing.
  • Developing a polynomial model of focused energy to derive optimized transducer arrangements.

Main Results:

  • The proposed method enables efficient Lamb wave detection without extensive random sampling.
  • Optimized transducer arrangements were determined for improved wave energy focusing.
  • The method was validated through both simulations and experimental tests on an engine fan blade.

Conclusions:

  • The developed optimization method effectively addresses challenges in Lamb wave SHM for complex structures.
  • Flexible transducer array placement can be efficiently optimized for enhanced wave focusing and detection.
  • The approach offers a practical solution for improving SHM in aerospace applications.