Review of Aging and Corrosion of Aircraft Integral Fuel Tank Sealing Materials
Jinbiao Xie,
Yuan Zhou,
Yiming Zhao,
Ran Mo
Issue:
Volume 11, Issue 5, September 2022
Pages:
102-108
Received:
13 October 2022
Accepted:
28 October 2022
Published:
4 November 2022
DOI:
10.11648/j.ijmsa.20221105.11
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Abstract: Polysulfide sealant has excellent oil resistance, water resistance, acid and alkali resistance properties, and thus is widely used as sealing material for fuel tank of aircraft integral structure. Aviation kerosene is easy to produce peroxides under hot oxygen conditions. At the same time, due to improper use and maintenance methods, the kerosene is easy to breed microorganisms, which causes aging and corrosion problems of the sealing rubber layer in the fuel tank to varying degrees, seriously affecting aircraft flight and use safety. In view of the increasingly prominent aging and corrosion problems of sealing adhesive layers in integral fuel tanks, the main issues regarding aging and microbial corrosion mechanisms are summarized, with an emphasis on the anti-aging measures, aging life calculation methods and corrosion protection measures that are responsible for sealing properties. The hot oxygen aging of polysulfide sealant in aviation kerosene leads to a significant decrease in the strength and elasticity of the sealant layer. Although the aging problem of polysulfide sealant cannot be prevented, it can be improved by adding fillers or modifying the polysulfide sealant. The problem of microbial corrosion can be effectively solved by controlling fuel quality, cleaning the fuel tank, sterilizing the fuel tank and other measures.
Abstract: Polysulfide sealant has excellent oil resistance, water resistance, acid and alkali resistance properties, and thus is widely used as sealing material for fuel tank of aircraft integral structure. Aviation kerosene is easy to produce peroxides under hot oxygen conditions. At the same time, due to improper use and maintenance methods, the kerosene i...
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Airfoil-Shaped Acoustic Metamaterial for Sound Insulation and Air Ventilation
Issue:
Volume 11, Issue 5, September 2022
Pages:
109-112
Received:
26 October 2022
Accepted:
16 November 2022
Published:
30 November 2022
DOI:
10.11648/j.ijmsa.20221105.12
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Abstract: In this paper, we introduce the new concept of acoustic silencers that disable noise to pass but permit the air ventilation. Conventional sound proofing structures prevent air ventilation between the interior and exterior where the sound is generated and propagated. Therefore, those sound proofing structures are hardly utilized in air flowing duct system or heat exchanging system with the needs of sound insulation. A design proposed in this paper has a shape of airfoil with narrow neck and empty cavity so that it acts like a Helmholtz resonator based acoustic metamaterial. This structure can be inserted in the air flowing duct and reduce the sound passing through the duct but does not resist the air flowing in the duct. Two different combinations of radii and cavities interact with each other so that the opposite phase of sound radiated from the neck makes the destructive interference, and the high transmission loss can be realized concludingly. The airfoil-shaped acoustic metamaterial can provide large open area and low flow resistance due to its geometrical concept, it is optimized in air ventilation as well. It is expected that the acoustic metastructure of the airfoil shape can be applied to various engineering problems that simultaneously deal with flow problems and noise problems, such as HVAC systems.
Abstract: In this paper, we introduce the new concept of acoustic silencers that disable noise to pass but permit the air ventilation. Conventional sound proofing structures prevent air ventilation between the interior and exterior where the sound is generated and propagated. Therefore, those sound proofing structures are hardly utilized in air flowing duct ...
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