基于谐振法的飞机多层异质结构件涡流检测方法研究

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中图分类号：TB9 文献标志码：A 文章编号：1674-5124（2025）08-0021-12

Abstract：The aircraft load-bearing beam is an important structural component of the aircraft，which is subjected to stressfor a long time.At its tiger mouth position， stress concentration can easily lead to fatigue cracks，and the cracks are hidden under thick multi-layer heterogeneous composite layers，resulting in large eddy current testing lift and extremely inconvenient detection due to limited space. This article proposes a resonant based eddy current detection sensing method for detecting hidden cracks in multi-layer heterostructures.The influence of coil size parameters and structure on the detection signal is simulated and studied.It is found that the optimal detection sensitivity is achieved when the distance between the detection coil and the balance coil is 1.5mm . Toverifythe correctness of the simulation model，a large lift off eddy current testing experiment was conducted on the load-bearing components.The test results showed that the optimal detection sensitivity was achieved at an excitation frequency of 30kHz .The signal amplitude reached itsminimum at a composite layer thickness of 3mm ，while keeping the composite material layer thickness unchanged. As the excitation frequency increased，the amplitude of the eddy current testing signal showed a decreasing trend. The minimum detection defect length × width × depth dimension was 5mm×0.2mm×5 mm，and the defect could be accurately located， providing abasis for quantitative detection of hidden cracks in multi-layer heterogeneous structures of aircraft.

Keywords： multi-layer heterogeneous structural elements; large lift-of; detection coil; excitation frequency; composite material; hidden crack

0 引言

飞机承力梁是飞机的重要承力结构件，主要用于安装固定起落架，并将地面载荷传递到机身结构上[1-2]。（剩余11406字）