Kineski lovac pete generacije J-20

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Napisano: 28 Avg 2011 1:50

S2M ::
Snaga je SNAGA.Ako je potrebno 20 kW snage onda je to 20 kw.Mislim da tih 20 kW za motor potiska 100 kN nije nikakav problem.Uzmite za primjer jedan agregat koji je pogonjen motorom od 1,5 kW snage,trpi snagu potrosaca od cca 5KW i ne dolazi do preopterecenja.Jedan takav mali,HONDIN,imam u firmi.Nisam strucnjak za avione,ali o el.energiji znam dosta.Ali po mom skromnom misljenju,za ostale potrosace na avionu nije potrebna velika snaga.

Mislim da stvari nisu tako jednostavne kako se cine, jer je upravo snabdevanje svih avionskih elektronskih sistema elektricnom energijom jedan od vecih izazova pred koje su stavljeni avio inzenjeri.
Recimo, sistem pokretanja aerodinamickih kontrolnih povrsina kod modernih aviona, kao sto je recimo F-35 se bazira na elektricnim, a ne na hidraulicnim sistemima.

Citat:The movement toward more-electric architectures during the past decade in military and commercial airborne systems continues to increase the complexity of designing and specifying the electric power system. In particular, the electrical power system faces challenges in meeting the highly dynamic power demands of advanced power electronics based loads. Numerous control techniques and design methodologies have been developed to ensure stable operation for expected operating conditions. However, many of these techniques are difficult to apply to complex systems due to the need to develop small-signal impedance models of all potential loads under all operating conditions including various permutations of which loads are active at any given time. In addition to these challenges, such techniques still do not guarantee large-displacement stability following major disturbances such as faults, regenerative operation, large pulsed loads, and/or the loss of generating capacity.

Practicable approaches are sought to guarantee the large-signal stability of isolated power systems such as those found in modern more-electric fighter aircraft like the Joint Strike Fighter Lightning II. As modern aircraft power architectures often include a variety of potential sources and loads, responses that account for the interaction and coordination of multiple sources such as a generator, electrical accumulator unit, auxiliary power units, and batteries are encouraged

Citat:
The US had a major technology breakthrough in AESA design around a half decade ago when Gallium Nitride (GaN) HEMT (High Electron Mobility Transistor) X-band transistors were perfected, allowing considerably more output power than earlier Gallium Arsenide transistors. This has created an effect not unlike euphoria in some parts of the US defence industry, and a worldwide drive by global semiconductor houses to occupy the market. Historically AESA performance was limited by the power output per module at X-band, typically of the order of 2 to 5 Watts per module. The GaN transistor technology appears at this stage to be capable of delivering ten times the power per module, which changes the problem AESA designers face from barely getting viable power output, to not having enough cooling and electrical power capacity to cope with the transistor technology available. A good example is the Toshiba TGI8596-50 GaN HEMT announced July, 2007, capable of delivering 50 Watts in the X-band and targeted at radar and microwave communications equipment.

Dopuna: 28 Avg 2011 16:54

Dve lepe fotke!





Pod ovim uglom i osvetljenjem moze da se zapazi velika "grba" u koju moze da se smesti dosta goriva.

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MiG denies stealth technology transfer to China
http://www.brahmand.com/news/MiG-denies-stealth-te...../1/10.html
Citat:Russian plane maker MiG said Russia has never transferred any stealth technology to China to assist in the development of J-20 Black Eagle fifth-generation stealth fighter prototype, according to a news report.

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Par lepih slika ove zver

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Citat:09-23-2011 ChengDu J-20 flight

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Malo da osvezimo temu

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Ovo je sve strogo kontrolisano "curenje" informacija u etar. Sve slike su slikane superzoom kamerama što utiče na kvalitet slike. Vidi se da su pikselisano toliko da se ne mogu videti najsitniji detalji, mada i atmosfrerski uticaji prave dobru prepreku. Isto tako je više nego očigledno da je ovo prva fotografija sa otvorenim spremištem za oružjem koje je identično sa slike makete iznad koje je neko postavio nedavno.
Sve u svemu, veoma lepo skrojena "senzacija". Sve infromacije su kao snimljene od avioentuzijasta ali je očigledno da je to sve uz blessing onih sa vrha.
Dopada mi se avion veoma. Mislim da će biti veoma dobra platforma sa odličnim radarom (sudeći po najvećim nosnim konusom u svojoj klasi) i gomilom raznog naoružanja.
Biće veselja kada bude postao operativan. Ja znam da ću ja da nazdravim.