时间:2018-12-14 作者:英语课 分类:2018年VOA慢速英语(十一)月


英语课

First Flight Completed of Plane with No Moving Parts


Engineers say they have carried out the first-ever flight of an electric airplane with no moving parts.


Researchers at the Massachusetts Institute of Technology, or MIT, recently shared video of the successful test flight. They also reported their results in the scientific journal Nature.


An airplane usually requires fast-turning turbines to create the necessary thrust and power to lift the plane off the ground and stay in the air.


But MIT researchers say they have created a new air vehicle that powers itself without this kind of engine. In fact, the plane was designed to have no moving parts at all.


Engineers say that developing and expanding such technology could greatly change the future of flying. It could lead to the creation 1 of planes that are safer, quieter and easier to take care of. Such planes would also not produce emissions 2 that harm the environment.


Steven Barrett is a professor of aeronautics 3 at MIT. He helped lead the plane’s development. He said the successful tests have opened up “new and unexplored possibilities” for future aircraft.


Barrett says he first got the idea for planes without moving parts from watching “Star Trek 4.” He told MIT News he imagined that futuristic air vehicles such as the ones created for “Star Trek” could one day fly in the real world. Such vehicles had simple designs. They moved smoothly 5 and silently.


The new technology is based on experiments that date back to at least the 1920s. Those early experiments dealt with a system used to create thrust called “ionic wind.”


Ionic wind describes a wind, or thrust, that can be produced when electrical current is passed between a thin and thick electrode. If enough electricity is created, the air between the two electrodes can produce enough thrust to power a small aircraft.


MIT’s experimental plane weighs about 2.5 kilograms. It was made to look similar to traditional aircraft. But instead of having engines attached under the wings, it contains a series of electrodes. The electrodes in the front are made of thin wire. In the back, they take the form of thicker airfoils.


The wires in front and airfoils in the back both carry high electricity – up to 20,000 volts 7 each. The two create an electrical field of opposing forces that produce wind behind the plane to make it fly.


Barrett said his team dealt with several failed attempts during early test flights of the plane. But the team was finally able to complete a successful flight in which the aircraft traveled about 60 meters in 10 seconds. He added that the plane likely could have flown farther if the test had been carried out in a larger building.


Barrett says the experiment demonstrated the first continuous flight of a plane that is heavier than air, but has no moving parts. “This was the simplest possible plane we could design that could prove the concept that an ion plane could fly,” he said.


Although the reported results could mark the beginning of major changes in the field of flight, Barrett said the current technology has shown limitations. “It’s still some way away from an aircraft that could perform a useful mission,” he said. “It needs to be more efficient, fly for longer, and fly outside.”


One possible issue will be creating a battery that is powerful enough to operate much larger versions of such aircraft, without being too heavy to fly on the plane.


Barrett says the current limitations make it more likely the technology will first be used to create smaller air vehicles. One possibility would be a drone. Drone use, especially in large cities, is expected to greatly increase around the world in coming years.


The MIT team says it believes drone designs without moving parts would create vehicles that are nearly silent and less polluting than current models.


I’m Bryan Lynn.


Words in This Story


turbine – n. large machine that produces power by using gas, steam, etc to turn a wheel


thrust – n. the pushing of something suddenly and with force


emission– n. something being released, usually into the air


electrode – n. the point where an electric current enters or leaves something such as a battery


airfoil – n. the cross-sectional shape of a wing or blade used by a propeller 8 or turbine


volt 6 – n. unit of measurment for the force of an electric current


concept – n. an idea or principle


efficient – adj. capable of producing desired results without wasting materials, time, or energy


battery – n. object that provides and stores electricity for things


drone – n. a kind of small aircraft that flies without a pilot



1 creation
n.创造,创造的作品,产物,宇宙,天地万物
  • Language is the most important mental creation of man.语言是人类头脑最重要的产物。
  • The creation of new playgrounds will benefit the local children.新游戏场的建立将有益于当地的儿童。
2 emissions
排放物( emission的名词复数 ); 散发物(尤指气体)
  • Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
  • Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。
3 aeronautics
n.航空术,航空学
  • National Aeronautics and Space undertakings have made great progress.国家的航空航天事业有了很大的发展。
  • He devoted every spare moment to aeronautics.他把他所有多余的时间用在航空学上。
4 trek
vi.作长途艰辛的旅行;n.长途艰苦的旅行
  • We often go pony-trek in the summer.夏季我们经常骑马旅行。
  • It took us the whole day to trek across the rocky terrain.我们花了一整天的时间艰难地穿过那片遍布岩石的地带。
5 smoothly
adv.平滑地,顺利地,流利地,流畅地
  • The workmen are very cooperative,so the work goes on smoothly.工人们十分合作,所以工作进展顺利。
  • Just change one or two words and the sentence will read smoothly.这句话只要动一两个字就顺了。
6 volt
n.伏特,伏
  • You may use 100 and 110 volt appliances in your room.您可以在房间使用100及110伏特的电器。
  • The common service voltage of electric power in our country is 220/380 volt.我国普通供电电压为220/380伏。
7 volts
n.(电压单位)伏特( volt的名词复数 )
  • The floating potential, Vf is usually only a few volts below ground. 浮置电势Vf通常只低于接地电位几伏。 来自辞典例句
  • If gamma particles are present, potential differences of several thousand volts can be generated. 如果存在γ粒子,可能产生几千伏的电位差。 来自辞典例句
8 propeller
n.螺旋桨,推进器
  • The propeller started to spin around.螺旋桨开始飞快地旋转起来。
  • A rope jammed the boat's propeller.一根绳子卡住了船的螺旋桨。
学英语单词
accessible singularity
Agapetes angulata
aporphine
arenaemyein
atavism reversion
auto-exciting
bacterial enteritis
basalt-plain
be unschooled in sth
building damage statistics
C. of E
cabinet radiation
cadavid
case mould plaster
center cracked tension specimen
chloropropanol
Consolidated Natural Gas
contextual effect
customer setup
damage water
deisidaimonia
dofetilide
doubletube plate condenser
durational verb
earthquake proof construction
electron configuration
Emiratizing
epoxy glass laminated sheet
Eraverm
F-format
failed broker
fellaheen
flame cut(ting)
foreign workers statistics
fusion warhead
Georgia Institute of Technology
honorablenesses
hydraulic classifier
hypoprogestinism
immunity from suit
incrust
indian-american
infrared remote control
isostearate
isotopic molecule
johnny bags
Kawaura
keep out
knight of the community/parliament
lead-acid storage battery
lockstitch
Lunache
lunar seismograph
machining constant
Macrosolen robinsonii
MediaFLO
mesalamine
Mglin
Mindanao
Mohembo
nova sofala(sofala)
oil production engineering
oncotrephin
one's bump of locality
out of door
pedia-gastrofiberscope
pigeon hawks
place utility
playpipe
police launch
power handling capacity
preexponential factor
primary current of a current transformer
quasi-two-dimensional
Quelpart I.
radio-electroencephalograph
read-write random-access memory
refering
representative rates of exchange
Rokitansky-Aschoff ducts
rubber anti-icer
sastre
selective electrode
separator-spatula
set afoot
ship control centre
Short Circuit Rating
Silver-grain
spidergrams
spring vegetable
start stop self-phasing code
stream layer
summission
three-tined
thrush breast
titrated
total labour force
triethyleneglycol
triple-screw steamer ship
urinary catheter
USAB
water beetles