Evaluating water ingress in glass fiber plastic/Nomex honeycomb panels under varying panel orientation

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Рұқсат жабық Тек жазылушылар үшін

Аннотация

The paper presents the results of experimental and numerical investigations on water ingress trapped in aircraft honeycomb panels. The ingress of atmospheric water during aircraft service may cause minor or major damages of airplane crucial components. The percentage of water/ice filling honeycomb cells is an important factor related to possible cell damage. This study is focused on the analysis of the following inspection parameters: 1) influence of panel orientation (horizontal, vertical and Inclined at 30, 45 and 60°) on the efficiency of water detection, 2) efficiency and optimization of a heating technique in evaluating water ingress, 3) influence of water/ice phase transformation on detectability of water ingress.

The numerical analysis was conducted by using the ThermoCalc-3D software in order to evaluate the detectability of water ingress in the cases where a test panel is placed in different spatial orientations. The samples with water and ice were tested and analysed by using several data processing algorithms available in the ThermoFit software to enhance water detection performance. The signal-to-noise ratio concept was used to compare efficiency of image processing algorithms in the inspection of water ingress in honeycomb panels with varying water content, spatial orientation and water/ice phase transformation.

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Рұқсат жабық

Авторлар туралы

C. Magoda

Mechanical Engineering Department, Cape Peninsula University of Technology

Хат алмасуға жауапты Автор.
Email: vavilov@tpu.ru
ОАР, P.O. Box 1906, Bellville, 7535 Cape Town

T. Ngonda

Mechanical Engineering Department, Cape Peninsula University of Technology

Email: vavilov@tpu.ru
ОАР, P.O. Box 1906, Bellville, 7535 Cape Town

V. Vavilov

National Research Tomsk Polytechnic University

Email: vavilov@tpu.ru
Ресей, 634050 Tomsk, Lenin av., 30

D. Kladov

National Research Tomsk Polytechnic University

Email: vavilov@tpu.ru
Ресей, 634050 Tomsk, Lenin av., 30

Әдебиет тізімі

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Жүктеу
2. Fig. 1. Diagnostics of water in the fuselage of the aircraft (with the permission of D.A. Nesteruk, TPU): a — after landing; b — after landing (thermogram at the top) and after 3 hours in the hot air blowing mode.

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3. Fig. 2. 3D numerical models of water in honeycombs (ThermoCalc 3D program): a — 100% water; b — 50%; c — 50%, side control; d — 100%, vertical panel; d — 50%, inclined control panel from below; e — 50%, inclined The panel is controlled from above.

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4. Fig. 3. The change in ΔT and C over time.

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5. Fig. 4. 3D temperature distributions at the moment of the maximum signal ∆Tm (50% of the water in the inclined panel): a — uniform heating; b — uneven heating.

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6. Fig. 5. 3D temperature distributions at the moment of the maximum signal ∆Tm (50% of the water in the vertical panel): a — uniform heating; b — uneven heating.

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7. Fig. 6. Cells of honeycombs with water (a) and an experimental installation (b).

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8. Fig. 7. The initial IR thermogram and the change in surface temperature over time (horizontal panel with air gaps).

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9. Fig. 8. Graphs of temperature changes at characteristic points (D1, D2, D3): a — initial data; b — after normalization at the end of heating.

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10. Fig. 9. Thermograms of the sample in different orientations: a — horizontal (180°); b — inclined (60°).

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11. Fig. 10. Active TC of water in honeycombs in the case of ice/water phase transition (D1: 25%; D2: 50%; D3: 100%; ND — defect-free zone): a — initial thermogram; b — temperature; c — temperature signal; d — temperature contrast.

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