日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

US EUROPE AFRICA ASIA 中文
China / Innovation

China joins global elite in fast rail

By Zhao Lei (China Daily) Updated: 2015-06-29 07:46

China joins global elite in fast rail

A CRH (China Railway High-speed) train runs on the rail in Shanghai, April 8, 2009. [Photo/IC]

China has become a world leader in high-speed railway technology with its development of a cutting-edge permanent magnet synchronous traction system that will take bullet trains to an ultrafast 500 kilometers per hour.

The advanced 690-kilowatt traction system was developed by CRRC Corp, the country's train-making behemoth, at its Zhuzhou Institute in Hunan province. It will soon enter mass production, said Ding Rongjun, a member of the Chinese Academy of Engineering who heads the institute.

"Now we have our own permanent magnet synchronous traction system with full intellectual property rights, marking a new chapter in China's high-speed railways," he said, adding that only a handful of countries are capable of manufacturing the sophisticated apparatus, including Germany and Japan.

Feng Jianghua, deputy director of the institute, said the adoption of the technology will reshape the high-speed railway industry because traction equipment is the most important part of a bullet train.

Currently, most high-speed trains in service in the world are propelled by alternating current asynchronous motors, a traction system first developed in the 1970s.

The Zhuzhou Institute began research and development on permanent magnet synchronous traction technology in 2003 after it noticed that major international train makers, such as Siemens and Bombardier, had launched projects to acquire the equipment, Feng told China Economic Weekly.

The magazine quoted Xu Junfeng, a senior engineer at the institute, as saying that engineers overcame a large number of technical difficulties. China had never looked at the high-tech equipment before the project.

After eight years, engineers completed development in 2011 and installed the advanced traction system on trains running on Subway Line 2 in Shenyang, Liaoning province, as a trial.

The test has proved successful, Xu said.

In December 2013, the institute brought the system to bullet trains, expecting speeds of 500 km/h. Trials were undertaken on several trains in October.

Jia Limin of Beijing Jiaotong University, who heads China's high-speed railway innovation program, said that if everything goes well, trains equipped with the new traction system will become fully operational by 2018.

Compared with an alternating current asynchronous motor, the new system boasts more power, simpler configuration and lower electrical consumption, Jia said.

"The new system has fewer parts than the current traction apparatus, so it is more reliable and efficient," he said.

Sheng Guangzu, general manager of China Railway Corp, has pledged to speed up the development of key technologies in high-speed rail and to design a new bullet train using Chinese standards.

 

Highlights
Hot Topics
...
主站蜘蛛池模板: 久久视频在线 | 久草99 | 国产91亚洲 | 日本黄色片免费看 | www.中文字幕在线观看 | 久久九九精品 | 99成人免费视频 | 亚洲天堂网在线观看 | 四虎影院永久网址 | 黄色片一区二区 | 亚洲国产黄色片 | 亚洲激情另类 | 很黄很色的网站 | 国产在线一区二区 | 日韩视频免费在线观看 | 日韩福利社 | 国产小视频在线观看 | 九九综合 | 黄色一级小视频 | 国产黄色高清视频 | 五月婷婷六月激情 | 欧美bbxxx | 91视频导航 | 国产男女视频 | 蘑菇福利视频一区播放 | 狠狠2019 | 亚洲青草| 一级黄色在线观看 | 美女国产一区 | 日本成人免费在线视频 | 1000部啪啪未满十八勿入超污 | 黄久久久| 日韩国产在线 | 国产在线色 | 伊人55 | 深夜国产 | 免费在线观看一级片 | 丁香婷婷色 | 欧美精品播放 | 深夜福利国产 | 欧美日韩精品久久久免费观看 |