成人小说亚洲一区二区三区,亚洲国产精品一区二区三区,国产精品成人精品久久久,久久综合一区二区三区,精品无码av一区二区,国产一级a毛一级a看免费视频,欧洲uv免费在线区一二区,亚洲国产欧美中日韩成人综合视频,国产熟女一区二区三区五月婷小说,亚洲一区波多野结衣在线

立即打開(kāi)
波音夢(mèng)想飛機(jī)注定有此一劫

波音夢(mèng)想飛機(jī)注定有此一劫

Shelley DuBois 2013-01-24
波音787夢(mèng)想飛機(jī)雖然出現(xiàn)了一系列故障和推遲,但這些似乎是如今的飛機(jī)制造業(yè)推出新機(jī)型的道路上必經(jīng)的磨難。而且,實(shí)事求是地講,目前或許沒(méi)有其他公司能做得比它更好。

????這里不是萊特兄弟試飛第一架飛機(jī)的俄亥俄州小鷹鎮(zhèn)。任何掌握尖端飛機(jī)制造技術(shù)的制造商需要的遠(yuǎn)遠(yuǎn)不只是兩顆聰明的腦瓜和一架滑翔機(jī)那么簡(jiǎn)單。以波音最新的787夢(mèng)想飛機(jī)為例:要想讓這樣一架飛機(jī)升空,波音必須與政府監(jiān)管機(jī)構(gòu)以及900多家承包商通力合作才行。這意味著上噸重量的活動(dòng)部件。顯然,并不是所有零部件都是合格的。夢(mèng)想飛機(jī)在2011年完成首次商業(yè)飛行,比原定日期晚了將近三年。由于近期波音787夢(mèng)想飛機(jī)遭遇了一系列故障,而其中大部分很可能電路和電池組有關(guān)。因此今年1月16日,美國(guó)聯(lián)邦航空管理局(FAA)暫停了正在美國(guó)投入使用的6架波音787夢(mèng)想飛機(jī)的運(yùn)營(yíng),直到調(diào)查人員確認(rèn)它們的安全性之后才能重新服役。而可能導(dǎo)致故障的電路和電池問(wèn)題對(duì)于民航業(yè)來(lái)說(shuō)都是新問(wèn)題。

????媒體對(duì)于波音787的故障絲毫不留情面,新聞標(biāo)題上充斥著“夢(mèng)想”變“噩夢(mèng)”這樣的字眼。但787客機(jī)的問(wèn)題究竟反映的是波音的管理失誤,抑或它們只是研發(fā)一款現(xiàn)代客機(jī)難以避免的成本之一?

????目前,波音和空客(Airbus)是唯一有能力生產(chǎn)大型高科技民用飛機(jī)的兩家公司。兩家公司分別在研發(fā)生產(chǎn)一些新型號(hào)的飛機(jī),而且各有不同的專攻重點(diǎn)。波音公司相信,市場(chǎng)需要像787夢(mèng)想飛機(jī)這樣的快速、輕型客機(jī)。而空客則相信市場(chǎng)想購(gòu)買大型飛機(jī)——比如它的空客A350XWB客機(jī)最多可安裝440個(gè)座位??湛虯350家族預(yù)計(jì)將在2014年投放市場(chǎng),盡管已知下線時(shí)間將會(huì)延遲。

????弗吉尼亞大學(xué)達(dá)頓商學(xué)院(University of Virginia's Darden School of Business)教授勞爾?卡奧說(shuō):“這是一項(xiàng)龐大復(fù)雜的項(xiàng)目。就像我們重新裝修廚房時(shí)一樣,它們很可能超出原定的時(shí)間和預(yù)算?!?/p>

????波音787夢(mèng)想飛機(jī)的部分動(dòng)力來(lái)自一塊鋰離子電池,它的電力系統(tǒng)和任何其它民航客機(jī)都不一樣。同時(shí)它的機(jī)身是用復(fù)合材料制成的,比市場(chǎng)上其它機(jī)型的材料要輕。這些特點(diǎn)使夢(mèng)想飛機(jī)的油耗要比同等尺寸的民航客機(jī)節(jié)省15%到20%。

????這些賣點(diǎn)同時(shí)也為波音帶來(lái)了重大的技術(shù)挑戰(zhàn),甚至就連波音這個(gè)擁有570億美元市值的龐大企業(yè)也很難憑借一己之力去解決。與洛克希德-馬丁(Lockheed Martin)等航空公司相比,波音自造零件所占的比重更大。即便這樣,波音也把787夢(mèng)想飛機(jī)70%的生產(chǎn)工作外包了出去。

????This ain't Kitty Hawk. Any aircraft creator on the cutting edge of technology needs much more than two brilliant men and a glider. Take Boeing's new 787 Dreamliner plane: Boeing had to work in concert with government regulators and more than 900 subcontractors to get this project off the ground. That is a ton of moving parts.

????Not all of those parts were up to snuff, apparently. The Dreamliner made its commercial debut in 2011, nearly three years behind schedule. On January 16, the FAA grounded the line's six active planes operating in the U.S. until investigators say they're safe to fly. The planes were grounded following a series of issues most likely related to defects in the model's electrical wiring and battery packs, both of which are spanking new to commercial aviation.

????The press has been rough, having fun with dream-to-nightmare headlines. But do the Dreamliner's problems reflect a management misstep at Boeing (BA), or are they simply the cost of building a modern plane?

????Boeing and Airbus are the only companies with the capabilities to build large, high-tech commercial planes. Each company has new models in the works, and each focuses on a different feature. Boeing made a bet that the market would want quick, light planes like the Dreamliner. Airbus made a bet that buyers would want big planes – its new aircraft, the A350 XWB can be configured to have up to 440 seats. The A350 family is set to hit the market in 2014, although it has faced rollout delays.

????"They're just massively complex projects," says Raul Chao, a professor at University of Virginia's Darden School of Business. "That means that, just like when you're remodeling your kitchen, they will go over budget and over time."

????The Dreamliner is powered, in part, by a lithium-ion battery, and its electrical system is unlike any other commercial aircraft. It is also built with composite materials, which are lighter than those used in other planes on the market. All these features enable the Dreamliner to burn about 15-20% less fuel than a commercial craft of comparable size.

????Those bells and whistles created a massive technical challenge beyond what even a company like Boeing, with a $57 billion market cap, can address on its own. Boeing, which builds more of its planes' own parts than other aerospace companies such as Lockheed Martin (LMT), outsourced 70% of the construction of the 787.

掃描二維碼下載財(cái)富APP
色国产精品一区在线观看| 日本精品一区二区在线观看| 无套内谢少妇毛片免费看看| 日韩精品中文字幕一区二区三区| 午夜精品久久久内射近拍高清| 亚洲欧洲美洲无码精品va| 夜夜躁狠狠躁2021| 久久久久久精品免费免费英国| 久久毛片基地全免费的| 国产熟女体下茂密黑森林| 精品少妇爆乳无码AⅤ区| 免费午夜伦费影视在线观看| 一级免费视频片高清无码| 亚洲人成人无码网WWW国| 亚洲国产在线精品国自产拍| 精品亚洲AⅤ无码午夜在线| 欧美亚洲国产一区二区三区| 国产成人精品免费午夜| 少妇激情一区二区三区视频| 亚洲国产精品成人综合| 亚洲精品一品区二品区三品区| 久久亚洲中文字幕无码| 婷婷五月情亚洲电影网站在在线播放| 天天婬欲婬香婬色婬视频播放| 国产精品无码专区AV在线播放| 国产午夜福利精品一区二区三区| 精品久久综合日本久久综合网| 亚洲A∨午夜成人片精品网站| 国产精品亚洲成在人线| 男人j桶女人p免费视频| 国产午夜理论不卡在线观看| 人妻精品久久无码区洗澡| 国产亚洲人成网站在线观看| 亚欧免费无码Aⅴ在线观看网站| 久久久97精品国产一区蜜桃| 巨胸美女露双奶头无遮挡一丝网站 | 乱辈通奷欧美系列视频| 观看A一级一区二区| 亚洲AV无码国产一区二区三区| 午夜免费无码福利视频麻豆| 在线无码一区二区三区不卡|