DAMAGE OF THE AIRCRAFT STRUCTURAL SYSTEM BY LIGHTING WITH RAIN PRECIPITATION ON ITS SURFACE
When an aircraft is struck by lightning damage of external structural elements is primarily caused by mechanical electrical impact of discharge on the aircraft, which results in the formation of dents on the skin, bends of panel elements (there have been cases of bending turbofan blades) and other d...
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| Format: | Article |
| Language: | Russian |
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Moscow State Technical University of Civil Aviation
2021-02-01
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| Series: | Научный вестник МГТУ ГА |
| Subjects: | |
| Online Access: | https://avia.mstuca.ru/jour/article/view/1787 |
| _version_ | 1797882912962510848 |
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| author | S. K. Kamzolov S. M. Novikov A. N. Razumovsky |
| author_facet | S. K. Kamzolov S. M. Novikov A. N. Razumovsky |
| author_sort | S. K. Kamzolov |
| collection | DOAJ |
| description | When an aircraft is struck by lightning damage of external structural elements is primarily caused by mechanical electrical impact of discharge on the aircraft, which results in the formation of dents on the skin, bends of panel elements (there have been cases of bending turbofan blades) and other deformations. Firstly, the mechanism of such lightning effect is caused by the action of ponderomotive forces generated by the interaction of the current in the lightning channel with currents flowing through the metal structures of the aircraft. Secondly, the shockwave of lightning has a physical impact on the elements of construction. The presence of condensation (moisture, ice) on the surface of the aircraft can significantly increase the damage of fuselage skin resulting from the electromechanical impact of lightning, which was confirmed by the results of the experimental research conducted at the Chair of Physics of the Moscow State Technical University of Civil Aviation. The water depth (as far as it is known, thunderstorm in most cases is accompanied by rain precipitation) can be large enough especially on the ground during parking and taxiing, as well as at takeoff operation and landing. Sheet samples of aluminum alloy skin D16AT with electrical discharge parameters (current amplitude 50–60 kA, duration of the first half-wave 30 microseconds) which were relatively equal to average parameters of natural lightning strike were tested. With water depth of not over 8 mm the indentations up to 2 mm deep and 30 mm in diameter were formed on samples up to 1,5 mm thick, with a sample thickness of 0,8 mm – over 10 mm in depth and up to 60–70 mm in diameter. Educated estimates indicated that presence of water increases the electrodynamic pressure on the skin several times. Firstly, having in consideration the elastic component such deformation can bring a danger to control mechanisms and surfaces located proximately under the skin when subjected to lightning strike. Secondly, electromechanical pressure amplification coupled with the striking acoustic wave generated by lightning can result in supercritical pressures in the mounting hardware of the skin. All of this should be taken into account both at the design stage of the aircraft and during aircraft operation including in particular post-flight inspection of the aircraft struck by lightning. |
| first_indexed | 2024-04-10T03:43:23Z |
| format | Article |
| id | doaj.art-eb6eff56fa0943f790eac647b9e6991e |
| institution | Directory Open Access Journal |
| issn | 2079-0619 2542-0119 |
| language | Russian |
| last_indexed | 2024-04-10T03:43:23Z |
| publishDate | 2021-02-01 |
| publisher | Moscow State Technical University of Civil Aviation |
| record_format | Article |
| series | Научный вестник МГТУ ГА |
| spelling | doaj.art-eb6eff56fa0943f790eac647b9e6991e2023-03-13T07:19:20ZrusMoscow State Technical University of Civil AviationНаучный вестник МГТУ ГА2079-06192542-01192021-02-01241324110.26467/2079-0619-2021-24-1-32-411385DAMAGE OF THE AIRCRAFT STRUCTURAL SYSTEM BY LIGHTING WITH RAIN PRECIPITATION ON ITS SURFACES. K. Kamzolov0S. M. Novikov1A. N. Razumovsky2Московский государственный технический университет гражданской авиацииМосковский государственный технический университет гражданской авиацииМосковский государственный технический университет гражданской авиацииWhen an aircraft is struck by lightning damage of external structural elements is primarily caused by mechanical electrical impact of discharge on the aircraft, which results in the formation of dents on the skin, bends of panel elements (there have been cases of bending turbofan blades) and other deformations. Firstly, the mechanism of such lightning effect is caused by the action of ponderomotive forces generated by the interaction of the current in the lightning channel with currents flowing through the metal structures of the aircraft. Secondly, the shockwave of lightning has a physical impact on the elements of construction. The presence of condensation (moisture, ice) on the surface of the aircraft can significantly increase the damage of fuselage skin resulting from the electromechanical impact of lightning, which was confirmed by the results of the experimental research conducted at the Chair of Physics of the Moscow State Technical University of Civil Aviation. The water depth (as far as it is known, thunderstorm in most cases is accompanied by rain precipitation) can be large enough especially on the ground during parking and taxiing, as well as at takeoff operation and landing. Sheet samples of aluminum alloy skin D16AT with electrical discharge parameters (current amplitude 50–60 kA, duration of the first half-wave 30 microseconds) which were relatively equal to average parameters of natural lightning strike were tested. With water depth of not over 8 mm the indentations up to 2 mm deep and 30 mm in diameter were formed on samples up to 1,5 mm thick, with a sample thickness of 0,8 mm – over 10 mm in depth and up to 60–70 mm in diameter. Educated estimates indicated that presence of water increases the electrodynamic pressure on the skin several times. Firstly, having in consideration the elastic component such deformation can bring a danger to control mechanisms and surfaces located proximately under the skin when subjected to lightning strike. Secondly, electromechanical pressure amplification coupled with the striking acoustic wave generated by lightning can result in supercritical pressures in the mounting hardware of the skin. All of this should be taken into account both at the design stage of the aircraft and during aircraft operation including in particular post-flight inspection of the aircraft struck by lightning.https://avia.mstuca.ru/jour/article/view/1787самолетмолнияосадкиобшивкапондеромоторные силыдеформация |
| spellingShingle | S. K. Kamzolov S. M. Novikov A. N. Razumovsky DAMAGE OF THE AIRCRAFT STRUCTURAL SYSTEM BY LIGHTING WITH RAIN PRECIPITATION ON ITS SURFACE Научный вестник МГТУ ГА самолет молния осадки обшивка пондеромоторные силы деформация |
| title | DAMAGE OF THE AIRCRAFT STRUCTURAL SYSTEM BY LIGHTING WITH RAIN PRECIPITATION ON ITS SURFACE |
| title_full | DAMAGE OF THE AIRCRAFT STRUCTURAL SYSTEM BY LIGHTING WITH RAIN PRECIPITATION ON ITS SURFACE |
| title_fullStr | DAMAGE OF THE AIRCRAFT STRUCTURAL SYSTEM BY LIGHTING WITH RAIN PRECIPITATION ON ITS SURFACE |
| title_full_unstemmed | DAMAGE OF THE AIRCRAFT STRUCTURAL SYSTEM BY LIGHTING WITH RAIN PRECIPITATION ON ITS SURFACE |
| title_short | DAMAGE OF THE AIRCRAFT STRUCTURAL SYSTEM BY LIGHTING WITH RAIN PRECIPITATION ON ITS SURFACE |
| title_sort | damage of the aircraft structural system by lighting with rain precipitation on its surface |
| topic | самолет молния осадки обшивка пондеромоторные силы деформация |
| url | https://avia.mstuca.ru/jour/article/view/1787 |
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