London, The efficiency of wind turbines can be increased and repair costs reduced through a new technique developed by engineers from the University of Sheffield.
The novel technique can predict when bearings inside wind turbines fail which could make wind energy cheaper.
Unexpected bearing failures are a common problem in wind turbines.
“By removing the risk of a loss of production and the need for unplanned maintenance, it can help to reduce the cost of wind energy and make it much more economically competitive,” said co-author of the paper professor Rob Dwyer-Joyce.
The method, developed by mechanical engineering research student Wenqu Chen, uses ultrasonic waves to measure the load transmitted through a ball bearing in a wind turbine.
The stress on wind turbine is recorded and then engineers can forecast its remaining service life.
When a bearing is subjected to a load, its thickness is reduced by a very small amount due to elastic deformation, and the speed of sound is affected by the stress level in the material. Both these effects change the time of flight of an ultrasound wave through a bearing.
The new method is the only way to directly measure the transmitted load through the rolling bearing components.
It uses a custom-built piezoelectric sensor mounted in the bearing to measure the time of flight and determine the load.
This sensor is less expensive and significantly smaller than currently available, making it suitable for smaller turbines.
It can also provide a better prediction of the maintenance needed, saving money in servicing, researchers said.
The study was published in the journal Proceedings of the Royal Society.
Hawking said everyone has a role to play in making sure that this generation and the next are fully engaged with the study of science at an early level to create “a better world for the whole human race.”
Lisbon, November 7, 2017 : Technology can hopefully reverse some of the harm caused to the planet by industrialization and help end disease and poverty, but artificial intelligence (AI) needs to be controlled, physicist Stephen Hawking said on Monday.
Hawking, a British cosmologist who was diagnosed with motor neuron disease aged 21, said technology could transform every aspect of life but cautioned that artificial intelligence poses new challenges.
He said artificial intelligence and robots are already threatening millions of jobs — but this new revolution could be used to help society and for the good of the world such as alleviating poverty and disease.
“The rise of AI could be the worst or the best thing that has happened for humanity,” Stephen Hawking said via telepresence at opening night of the 2017 Web Summit in Lisbon that is attended by about 60,000 people.
“We simply need to be aware of the dangers, identify them, employ the best possible practice and management and prepare for its consequences well in advance.”
Hawking’s comments come during an escalating debate about the pro and cons of artificial intelligence, a term used to describe machines with a computer code that learns as it goes.
Silicon Valley entrepreneur Elon Musk, who is chief executive of electric car maker Tesla Inc and rocket company SpaceX, has warned that AI is a threat to humankind’s existence.
But Microsoft co-founder Bill Gates, in a rare interview recently, told the WSJ Magazine that there was nothing to panic about.
Stephen Hawking said everyone has a role to play in making sure that this generation and the next are fully engaged with the study of science at an early level to create “a better world for the whole human race.”
“We need to take learning beyond a theoretical discussion of how AI should be, and take action to make sure we plan for how it can be,” said Stephen Hawking, who communicates via a cheek muscle linked to a sensor and computerized voice system.
“You all have the potential to push the boundaries of what is accepted, or expected, and to think big. We stand on the threshold of a brave new world. It is an exciting — if precarious — place to be and you are the pioneers,” he said. (VOA)
US President Donald Trump said on Sunday that he expected to meet his Russian counterpart Vladimir Putin during his Asia tour.
“I think it’s expected we’ll meet with Putin, yeah. We want Putin’s help on North Korea, and we’ll be meeting with a lot of different leaders,” Donald Trump told reporters on Air Force One before landing at the Yokota Air Base in Japan, Efe reported.
Putin is scheduled to participate in the Asia-Pacific Economic Cooperation (APEC) summit in Da Nang, Vietnam, which Trump will also attend as part of his long Asia tour.
The North Korean nuclear threat is expected to dominate Donald Trump’s meetings in Japan and the next two stages of his tour, South Korea and China, where he will have a highly anticipated sit-down with Chinese President Xi Jinping.
The remainder of the tour will be more focused on economic issues, with Trump scheduled to take part in the APEC meeting in Da Nang and then in the Association of Southeast Asian Nations (ASEAN) Summit and the East Asia Summit in the Philippines.
Donald Trump’s first trip to Asia is the longest international tour by a US head of state since the one then-President George H.W. Bush embarked on in 1992.
Bush became ill at the end of that trip, famously vomiting on the Japanese prime minister’s lap at a formal dinner before fainting.(IANS)
Washington, October 8, 2017 : Most Americans believe their jobs are safe from the spread of robots and automation, at least during their lifetimes, and only a handful says automation has cost them a job or loss of income.
Still, a survey by the Pew Research Center also found widespread anxiety about the general impact of technological change. Three-quarters of Americans say it is at least “somewhat realistic” that robots and computers will eventually perform most of the jobs currently done by people. Roughly the same proportion worry that such an outcome will have negative consequences, such as worsening inequality.
“The public expects a number of different jobs and occupations to be replaced by technology in the coming decades, but few think their own job is heading in that direction,” Aaron Smith, associate director at the Pew Research Center, said.
The Pew Research Center in Washington, D.C. on July 6, 2005, is the author of a 2017 study looking at the spread of automation and robotics in the workplace.
More than half of respondents expect that fast food workers, insurance claims processors and legal clerks will be mostly replaced by robots and computers during their lifetimes. Nearly two-thirds think that most retailers will be fully automated in 20 years, with little or no human interaction between customers and employers.
Americans’ relative optimism about their own jobs might be the more accurate assessment. Many recent expert analyses are finding less dramatic impacts from automation than studies from several years ago that suggested up to half of jobs could be automated.
Skills will need to be updated
A report issued by the education company Pearson, Oxford University, and the Nesta Foundation found that just one in five workers are in occupations that will shrink by 2030.
Many analysts increasingly focus on the impact of automation on specific tasks, rather than entire jobs. A report in January from the consulting firm McKinsey concluded that less than 5 percent of occupations were likely to be entirely automated. But it also found that in 60 percent of occupations, workers could see roughly one-third of their tasks automated.
That suggests workers will need to continually upgrade their skills as existing jobs evolve with new technologies.
Few have lost jobs to automation
Just 6 percent of the respondents to the Pew survey said that they themselves have either lost a job or seen their hours or incomes cut because of automation. Perhaps not surprisingly, they have a much more negative view of technology’s impact on work. Nearly half of those respondents say that technology has actually made it harder for them to advance in their careers.
Contrary to the stereotype of older workers unable to keep up with new technology, younger workers — aged 18 through 24 — were the most likely to say that the coming of robots and automation had cost them a job or income. Eleven percent of workers in that group said automation had cut their pay or work hours. That’s double the proportion of workers aged 50 through 64 who said the same.
The Pew survey also found widespread skepticism about the benefits of many emerging technologies, with most Americans saying they would not ride in a driverless car. A majority are also not interested in using robots as caregiver for elderly relatives.
Thirty percent of respondents said they think self-driving cars would actually cause traffic accidents to increase, and 31 percent said they would stay roughly the same. Just 39 percent said they thought accidents would decline.
More than 80 percent support the idea of requiring self-driving cars to stay in specific lanes.
The survey was conducted in May and had 4,135 respondents, Pew said. (VOA)