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Henri K.

[Chine] H-xx Bombardier Tactique Furtif

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Il y a 4 heures, Henri K. a dit :

 

Quelle est cette silhouette et qu’est-ce qui est écrit dessus ?

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La Chine aurait produit un nouveau matériau qui permettrait de rendre furtif pour un coup faible sur une large bande passante.

https://www.scmp.com/news/china/science/article/3018974/chinese-scientists-hail-incredible-stealth-breakthrough-may

Chinese scientists hail ‘incredible’ stealth breakthrough that may blind military radar systems
Researchers at academy of science believe electromagnetic wave model is key that will herald new era in radar detection and avoidance for military ships and aircraft
'Chinese scientists have achieved a series of breakthroughs in stealth materials technology that they claim can make fighter jets and other weaponry lighter, cheaper to build and less vulnerable to radar detection.
Professor Luo Xiangang and colleagues at the Institute of Optics and Electronics, Chinese Academy of Sciences in Chengdu, Sichuan province, said they had created the world’s first mathematical model to precisely describe the behaviour of electromagnetic waves when they strike a piece of metal engraved with microscopic patterns, according to a statement posted on the academy’s website on Monday.
With their new model and breakthroughs in materials fabrication, they developed a membrane, known as a meta surface, which can absorb radar waves in the widest spectrum yet reported.
At present, stealth aircraft mainly rely on special geometry – their body shape – to deflect radar signals, but those designs can affect aerodynamic performance. They also use radar absorbing paint, which has a high density but only works against a limited frequency spectrum.
Chinese scientists have achieved a series of breakthroughs in stealth materials technology that they claim can make fighter jets and other weaponry lighter, cheaper to build and less vulnerable to radar detection.
Professor Luo Xiangang and colleagues at the Institute of Optics and Electronics, Chinese Academy of Sciences in Chengdu, Sichuan province, said they had created the world’s first mathematical model to precisely describe the behaviour of electromagnetic waves when they strike a piece of metal engraved with microscopic patterns, according to a statement posted on the academy’s website on Monday.
With their new model and breakthroughs in materials fabrication, they developed a membrane, known as a meta surface, which can absorb radar waves in the widest spectrum yet reported.
At present, stealth aircraft mainly rely on special geometry – their body shape – to deflect radar signals, but those designs can affect aerodynamic performance. They also use radar absorbing paint, which has a high density but only works against a limited frequency spectrum.
In one test, the new technology cut the strength of a reflected radar signal – measured in decibels – by between 10 and nearly 30dB in a frequency range from 0.3 to 40 gigahertz.
A stealth technologist from Fudan University in Shanghai, who was not involved in the work, said a fighter jet or warship using the new technology could feasibly fool all military radar systems in operation today.

Edited by herciv
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Quelle résistance aux éléments extérieurs pour de telles membranes, même derrière un revêtement spécifique?

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Il y a 9 heures, herciv a dit :

La Chine aurait produit un nouveau matériau qui permettrait de rendre furtif pour un coup faible sur une large bande passante.

https://www.scmp.com/news/china/science/article/3018974/chinese-scientists-hail-incredible-stealth-breakthrough-may

Chinese scientists hail ‘incredible’ stealth breakthrough that may blind military radar systems
Researchers at academy of science believe electromagnetic wave model is key that will herald new era in radar detection and avoidance for military ships and aircraft
'Chinese scientists have achieved a series of breakthroughs in stealth materials technology that they claim can make fighter jets and other weaponry lighter, cheaper to build and less vulnerable to radar detection.
Professor Luo Xiangang and colleagues at the Institute of Optics and Electronics, Chinese Academy of Sciences in Chengdu, Sichuan province, said they had created the world’s first mathematical model to precisely describe the behaviour of electromagnetic waves when they strike a piece of metal engraved with microscopic patterns, according to a statement posted on the academy’s website on Monday.
With their new model and breakthroughs in materials fabrication, they developed a membrane, known as a meta surface, which can absorb radar waves in the widest spectrum yet reported.
At present, stealth aircraft mainly rely on special geometry – their body shape – to deflect radar signals, but those designs can affect aerodynamic performance. They also use radar absorbing paint, which has a high density but only works against a limited frequency spectrum.
Chinese scientists have achieved a series of breakthroughs in stealth materials technology that they claim can make fighter jets and other weaponry lighter, cheaper to build and less vulnerable to radar detection.
Professor Luo Xiangang and colleagues at the Institute of Optics and Electronics, Chinese Academy of Sciences in Chengdu, Sichuan province, said they had created the world’s first mathematical model to precisely describe the behaviour of electromagnetic waves when they strike a piece of metal engraved with microscopic patterns, according to a statement posted on the academy’s website on Monday.
With their new model and breakthroughs in materials fabrication, they developed a membrane, known as a meta surface, which can absorb radar waves in the widest spectrum yet reported.
At present, stealth aircraft mainly rely on special geometry – their body shape – to deflect radar signals, but those designs can affect aerodynamic performance. They also use radar absorbing paint, which has a high density but only works against a limited frequency spectrum.
In one test, the new technology cut the strength of a reflected radar signal – measured in decibels – by between 10 and nearly 30dB in a frequency range from 0.3 to 40 gigahertz.
A stealth technologist from Fudan University in Shanghai, who was not involved in the work, said a fighter jet or warship using the new technology could feasibly fool all military radar systems in operation today.

L'application connue des méta-matériaux n'est pas d'abord sur le nouveau bombardier stratégique chinois mais sur le J-20, confirmé par son ingénieur en chef, ainsi que les navires de la marine et les missiles balistiques de la Force des fusées :

http://www.eastpendulum.com/les-meta-materiaux-et-le-j-20

Le professeur en question est 罗先刚, directeur de thèse et aussi directeur de l'Institut IOE (Institute of Optics and Electronics). Il est surtout spécialisé dans le domaine de la nanophotonique.

Et les résultats cités par SCMP datent en fait de Juillet 2015 déjà... http://www.sctyzx.gov.cn/tzrwzk/201607/54250766.html

SCMP, sérieusement, what can I say...

il y a 2 minutes, Patrick a dit :

Quelle résistance aux éléments extérieurs pour de telles membranes, même derrière un revêtement spécifique?

Au plein milieu du désert, ou dans près de la côte est en région humide, sans besoin de hangar spécifique, ça répond à la question ?

xuCNLIB.jpg

aSiV95j.jpg

Henri K.

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