以外界任意振动为动力的迷你发电机将问世
文章来源:未知 文章作者:meng 发布时间:2010-03-24 03:18 字体: [ ]  进入论坛
(单词翻译:双击或拖选)

Tiny generators1 developed at the University of Michigan could produce enough electricity from random2(任意的,随机的) , ambient(周围的,外界的) vibrations4 to power a wristwatch, pacemaker or wireless5 sensor6. The energy-harvesting devices, created at U-M's Engineering Research Center for Wireless Integrated Microsystems, are highly efficient at providing renewable electrical power from arbitrary(任意的,武断的) , non-periodic vibrations. This type of vibration3 is a byproduct of traffic driving on bridges, machinery7 operating in factories and humans moving their limbs, for example.

The Parametric(参数的) Frequency Increased Generators (PFIGs) were created by Khalil Najafi, chair of electrical and computer engineering, and Tzeno Galchev, a doctoral student in the same department.

Most similar devices have more limited abilities because they rely on regular, predictable energy sources, said Najafi, who is the Schlumberger Professor of Engineering and also a professor in the Department of Biomedical Engineering.

"The vast majority of environmental kinetic8 energy(动能) surrounding us everyday does not occur in periodic, repeatable patterns. Energy from traffic on a busy street or bridge or in a tunnel, and people walking up and down stairs, for example, cause vibrations that are non-periodic and occur at low frequencies," Najafi said. "Our parametric generators are more efficient in these environments."

The researchers have built three prototypes(原型) and a fourth is forthcoming. In two of the generators, the energy conversion9 is performed through electromagnetic induction10(电磁感应) , in which a coil is subjected to a varying magnetic field. This is a process similar to how large-scale generators in big power plants operate.

The latest and smallest device, which measures one cubic centimeter, uses a piezoelectric material(压电材料) , which is a type of material that produces charge when it is stressed. This version has applications in infrastructure11 health monitoring. The generators could one day power bridge sensors12 that would warn inspectors13 of cracks or corrosion14(腐蚀,衰败) before human eyes could discern(识别,辨别) problems.

The generators have demonstrated that they can produce up to 0.5 milliwatts (or 500 microwatts) from typical vibration amplitudes15(振动振幅) found on the human body. That's more than enough energy to run a wristwatch, which needs between one and 10 microwatts, or a pacemaker, which needs between 10 and 50. A milliwatt is 1,000 microwatts.

"The ultimate goal is to enable various applications like remote wireless sensors and surgically16 implanted medical devices," Galchev said. "These are long lifetime applications where it is very costly17 to replace depleted18(废弃的,耗尽的) batteries or, worse, to have to wire the sensors to a power source."

Batteries are often an inefficient19 way to power the growing array of wireless sensors being created today, Najafi said. Energy scavenging(清除,净化) can provide a better option.

"There is a fundamental question that needs to be answered about how to power wireless electronic devices, which are becoming ubiquitous(普遍存在的) and at the same time very efficient," Najafi said. "There is plenty of energy surrounding these systems in the form of vibrations, heat, solar, and wind."

These generators could also power wireless sensors deployed20 in buildings to make them more energy efficient(节能) , or throughout large public spaces to monitor for toxins21(毒素,毒质) or pollutants22.



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1 generators 49511c3cf5edacaa03c4198875f15e4e     
n.发电机,发生器( generator的名词复数 );电力公司
参考例句:
  • The factory's emergency generators were used during the power cut. 工厂应急发电机在停电期间用上了。
  • Power can be fed from wind generators into the electricity grid system. 电力可以从风力发电机流入输电网。 来自《简明英汉词典》
2 random HT9xd     
adj.随机的;任意的;n.偶然的(或随便的)行动
参考例句:
  • The list is arranged in a random order.名单排列不分先后。
  • On random inspection the meat was found to be bad.经抽查,发现肉变质了。
3 vibration nLDza     
n.颤动,振动;摆动
参考例句:
  • There is so much vibration on a ship that one cannot write.船上的震动大得使人无法书写。
  • The vibration of the window woke me up.窗子的震动把我惊醒了。
4 vibrations d94a4ca3e6fa6302ae79121ffdf03b40     
n.摆动( vibration的名词复数 );震动;感受;(偏离平衡位置的)一次性往复振动
参考例句:
  • We could feel the vibrations from the trucks passing outside. 我们可以感到外面卡车经过时的颤动。
  • I am drawn to that girl; I get good vibrations from her. 我被那女孩吸引住了,她使我产生良好的感觉。 来自《简明英汉词典》
5 wireless Rfwww     
adj.无线的;n.无线电
参考例句:
  • There are a lot of wireless links in a radio.收音机里有许多无线电线路。
  • Wireless messages tell us that the ship was sinking.无线电报告知我们那艘船正在下沉。
6 sensor sz7we     
n.传感器,探测设备,感觉器(官)
参考例句:
  • The temperature sensor is enclosed in a protective well.温度传感器密封在保护套管中。
  • He plugged the sensor into a outlet.他把传感器插进电源插座。
7 machinery CAdxb     
n.(总称)机械,机器;机构
参考例句:
  • Has the machinery been put up ready for the broadcast?广播器材安装完毕了吗?
  • Machinery ought to be well maintained all the time.机器应该随时注意维护。
8 kinetic p2Fxs     
adj.运动的;动力学的
参考例句:
  • There exist many sources of energy both potential and kinetic.存在着许多势能和动能的能源。
  • The kinetic theory of gases is the best known example.气体动力学理论就是最有名的例子。
9 conversion UZPyI     
n.转化,转换,转变
参考例句:
  • He underwent quite a conversion.他彻底变了。
  • Waste conversion is a part of the production process.废物处理是生产过程的一个组成部分。
10 induction IbJzj     
n.感应,感应现象
参考例句:
  • His induction as a teacher was a turning point in his life.他就任教师工作是他一生的转折点。
  • The magnetic signals are sensed by induction coils.磁信号由感应线圈所检测。
11 infrastructure UbBz5     
n.下部构造,下部组织,基础结构,基础设施
参考例句:
  • We should step up the development of infrastructure for research.加强科学基础设施建设。
  • We should strengthen cultural infrastructure and boost various types of popular culture.加强文化基础设施建设,发展各类群众文化。
12 sensors 029aee483db9ae244d7a5cb353e74602     
n.传感器,灵敏元件( sensor的名词复数 )
参考例句:
  • There were more than 2000 sensors here. 这里装有两千多个灵敏元件。 来自《简明英汉词典》
  • Significant changes have been noted where sensors were exposed to trichloride. 当传感器暴露在三氯化物中时,有很大变化。 来自辞典例句
13 inspectors e7f2779d4a90787cc7432cd5c8b51897     
n.检查员( inspector的名词复数 );(英国公共汽车或火车上的)查票员;(警察)巡官;检阅官
参考例句:
  • They got into the school in the guise of inspectors. 他们假装成视察员进了学校。 来自《简明英汉词典》
  • Inspectors checked that there was adequate ventilation. 检查员已检查过,通风良好。 来自《简明英汉词典》
14 corrosion boHzd     
n.腐蚀,侵蚀;渐渐毁坏,渐衰
参考例句:
  • Corrosion is not covered by the warranty.腐蚀不在保修范围之内。
  • Zinc is used to protect other metals from corrosion.锌被用来保护其他金属不受腐蚀。
15 amplitudes 4e409a57adec323b4e77d839218c2fae     
振幅( amplitude的名词复数 ); 广大; (智力的)幅度; 充足
参考例句:
  • As with incoherent light one then adds irradiances rather than amplitudes. 就和非相干光的情况一样,这时是将辐照度相加而不是把振幅相加。
  • Unfortunately, it is not possible to disentangle these two amplitudes experimentally. 遗憾的是,实验上不可能分开这两个振幅。
16 surgically surgically     
adv. 外科手术上, 外科手术一般地
参考例句:
  • Unsightly moles can be removed surgically. 不雅观的痣可以手术去除。
  • To bypass this impediment an almost mature egg cell is removed surgically. 为了克服这一障碍,通过手术,取出一个差不多成熟的卵细胞。
17 costly 7zXxh     
adj.昂贵的,价值高的,豪华的
参考例句:
  • It must be very costly to keep up a house like this.维修这么一幢房子一定很昂贵。
  • This dictionary is very useful,only it is a bit costly.这本词典很有用,左不过贵了些。
18 depleted 31d93165da679292f22e5e2e5aa49a03     
adj. 枯竭的, 废弃的 动词deplete的过去式和过去分词
参考例句:
  • Food supplies were severely depleted. 食物供应已严重不足。
  • Both teams were severely depleted by injuries. 两个队都因队员受伤而实力大减。
19 inefficient c76xm     
adj.效率低的,无效的
参考例句:
  • The inefficient operation cost the firm a lot of money.低效率的运作使该公司损失了许多钱。
  • Their communication systems are inefficient in the extreme.他们的通讯系统效率非常差。
20 deployed 4ceaf19fb3d0a70e329fcd3777bb05ea     
(尤指军事行动)使展开( deploy的过去式和过去分词 ); 施展; 部署; 有效地利用
参考例句:
  • Tanks have been deployed all along the front line. 沿整个前线已部署了坦克。
  • The artillery was deployed to bear on the fort. 火炮是对着那个碉堡部署的。
21 toxins 18c3f40d432ba8dc33bad8fb82873ea8     
n.毒素( toxin的名词复数 )
参考例句:
  • The seas have been used as a receptacle for a range of industrial toxins. 海洋成了各种有毒工业废料的大容器。
  • Most toxins are naturally excreted from the body. 大部分毒素被自然排出体外。 来自《简明英汉词典》
22 pollutants 694861490fe64672170a0da250a277c7     
污染物质(尤指工业废物)( pollutant的名词复数 )
参考例句:
  • Pollutants are constantly being released into the atmosphere. 污染物质正在不断地被排放到大气中去。
  • The 1987 Amendments limit 301(g) discharges to a few well-studied nonconventional pollutants. 1987年的修正案把第301条(g)的普通排放限制施加在一些认真研究过的几种非常规污染物上。 来自英汉非文学 - 环境法 - 环境法
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