首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Computerized design, advancfed materials and new technologies are being used to produce machines of a type never seen before.
Computerized design, advancfed materials and new technologies are being used to produce machines of a type never seen before.
admin
2013-01-19
28
问题
Computerized design, advancfed materials and new technologies are being used to produce machines of a type never seen before.
It looks as if it came straight from the set of Star Wars. It has four-wheel drive and rises above rocky surfaces. It lowers and raises its nose when going up and down hills. And when it comes to a river, it turns amphibious: two hydrojets power it along by blasting water under its body. There is room for two passengers and a driver, who sit inside a glass bubble operating electronic, aircraft-type controls. A vehicle so daring on land and water needs windscreen wipers--but it doesn’t have any. Water molecules are disintegrated on the screen’s surface by ultrasonic sensors.
This unusual vehicle is the Racoon. It is an invention not of Hollywood but of Renault, a rather conservative French state-owned carmaker, better known for its family hatchbacks. Renault built the Racoon to explore new freedoms for designers and engineers created by advances in materials and manufacturing processes. Renault is thinking about startlingly different cars; other producers have radical new ideas for trains, boats and aeroplanes.
The first of the new freedoms is in design. Powerful computer-aided design (CAD) systems can replace with a click of a computer mouse hours of laborious work done on thousands of drawing boards. So new products, no matter how complicated, can be developed much faster. For the first time, Boeing will not have to build a giant replica of its new airliner, the 777, to make sure all the bits fit together. Its CAD sys- tem will take care of that.
But Renault is taking CAD further. It claims the Racoon is the world’s first vehicle to be designed within the digitized world of virtual reality. Complex programs were used to imitate the vehicle and the land that it was expected to cross. This allowed a team led by Patrick Le Qucment, Renault’s industrial-design director, to "drive" it long before a prototype existed.
Renault is not alone in thinking that virtual reality will transform automotive de- sign. In Detroit, Ford is also investigating its potential. Jack Telnac, the firm’s bead of design, would like designers in different parts of the world to work more closely together, linked by computers. They would do more than style cares. Virtual reality will allow engineers to peer inside the working parts of a vehicle. Designers will watch bearings move, oil flow, gears mesh and hydraulics pump. As these techniques catch on, even stranger vehicles are likely to come along.
Transforming these creations from virtual reality to actual reality will also become easier, especially with advances in materials. Firms that once bashed everything out of steel now find that new alloys of composite materials (which can be made from mixtures of plastic, resin, ceramics and metals, reinforced with fibers such as glass of carbon) are changing the rules of manufacturing. At the same time, old materials keep getting better, as their producers try to secure their place in the factory of the future. This competition is increasing the pace of development of all materials.
With composites, it is possible to build many different parts into a single component. Fiat, Italy’s biggest car maker has worked out that it could reduce the number of components needed in one of its car bodies from 150 to 16 by using a composite shell rather than one made of steel. Aircraft and cars may increasingly be assembled as if they were plastic kits.
Which of the following is NOT mentioned as an ingredient of composite?
选项
A、Plastic.
B、Resin.
C、Glass.
D、Steel.
答案
D
解析
倒数第2段在讲述composite material时列举了plastic,resin, ceramics and metals。选项D中的steel不包含在内,而从后文,如by using a composite shell rather than one made of steel可将组件需求数日从150减少到16,也可看出steel与composite不是同类事物。
转载请注明原文地址:https://kaotiyun.com/show/dx2O777K
0
考博英语
相关试题推荐
ItishardtocomprehendwhattheimmediateaftermathmusthavebeenlikeinHiroshima.Therewerethegrimtasksofcollecting
Ifexcellentworkresultsinfrequentpayincreasesorpromotions,theworkerswillhavegreater______toproduce.
Anyparentwithachild【1】theagesof3and11cantellyou【2】technologyhascreptintonearly【3】aspectsofplaytimeandnearly
Asmainstreamchipproductiontechnologyshiftsfromonegenerationtothenexteverythreetofiveyears,plantswithnewtechn
Sometimesthestudentmaybeaskedtowriteabouthis______toacertainbookorarticlethathassomebearingonthesubjectbe
______,hedoesgetirritatedwithhersometimes.
LikemostotherAmericancompanieswitharigid____,workersandmanagershavestrictlydefinedduties.
Personalcomputersarenolongersomethingbeyondtheordinarypeople;theyare_____availablethesedays.
Writingaboutmusicislikedancingaboutarchitecture,orsothesayinggoes.SometimesattributedtoFrankZappa,othertimes
随机试题
糖化血红蛋白的临床意义是()。
男性,38岁,车祸伤及头部,当即出现右侧鼻唇沟变浅,右外耳道流出淡血性液体,右耳听力下降,CT示颅内少量积气。考虑患者出现了
板式橡胶支座极限抗压强度,部颁标准规定为()。
多向搅拌桩钻机就位必须正确,其孔位偏差不得大于(),钻杆垂直度偏差不得大于()。
下列关于专家判断法的信用风险评级方法说法错的是()。
【背景材料】生态文明贵阳国际论坛2014年年会7月11日在贵阳开幕。国务院总理李克强向论坛发来贺信。他表示,生态文明源于对发展的反思,也是对发展的提升,事关当代人的民生福祉和后代人的发展空间。中国把生态文明建设放在国家现代化建设更加突出的位置,坚持在发展
设X1,X2,…,X7是总体X~N(0,4)的简单随机样本,求P.
下列选项中,关于弹性分组环的叙述不正确的是()。
We’vehalvedthepriceofliterallythousandsofbooks,includinghundredsofbrandnewtitles.We’vealsotaken25%offaudiobo
NowWe’reTalking:HowVoiceTechnologyIsTransformingComputing[A]Likecastingamagicspell,itletspeoplecontrolthewor
最新回复
(
0
)