Quotulatiousness

July 26, 2011

Chinese government announces safety review after high speed rail crash

Filed under: Bureaucracy, China, Media, Technology — Tags: , , , , — Nicholas @ 09:01

In the wake of the deadly collision between two high speed trains, China announced a safety review of the high speed railway system:

Mr Sheng said railway officials would be deployed at frontline rail operations across the country to overhaul maintenance standards and checks on power connections to pre-empt outages.

All local railway bureaux were to draw lessons from the accident, a statement on the railways department website said.

Public fury and scepticism have been expressed in China’s blogosphere, both about the death toll of 39 people — suggesting it is too low — and the safety of China’s rail network.

State newspapers have also expressed concern. The Global Times ran a headline: Anger mounts at lack of answers.

“As the world is experiencing globalisation and integration, why can’t China provide the same safety to its people?” an editorial read.

July 24, 2011

No, that’s not suspicious at all . . .

Filed under: China, Government, Technology — Tags: , , , , , — Nicholas @ 11:39

. . . when you use backhoes to bury the wreckage before determining the cause of the high speed rail crash:

The wreck on Saturday night killed 35 and injured 210 after a high-speed train lost power for more than 20 minutes and then was rear-ended by another train, according to the Xinhua news agency. Six cars derailed and two fell off a viaduct near the city of Wenzhou.

[. . .]

Photos on the popular Weibo microblogging service showed backhoes burying the wrecked train near the site. Critics said the wreckage needed to be carefully examined for causes of the malfunction, but the railway ministry said that the trains contain valuable national technology and could not be left in the open in case it fell into the wrong hands.

Foreign companies maintain that some crucial technology was stolen from their imported trains. But more importantly to domestic audiences is the perception of a coverup. Initial reports of how the accident occurred are already being partly contradicted by reports in the official media.

June 21, 2011

Chinese high speed trains to run slower than planned

Filed under: China, Technology — Tags: , , , , — Nicholas @ 13:02

They’ll still qualify as high speed trains, but they’ll only travel at speeds up to 250kph instead of the 385kph they were designed to achieve. The problem is safety concerns:

The Chinese government has announced a significant lowering in the top speed its hallmark Beijing-to-Shanghai high-speed train will be allowed to run at when it opens later this month after a review of safety, shoddy workmanship and corruption.

The new service halving the 10-hour rail travel time between China’s political and business centres was meant to be the flagship project of a massive $400-billion program to give the country the most extensive bullet train network anywhere.

But the announcement last week by the Railway Ministry that trains on the new line will only be permitted to run at about 250 kilometres per hour instead of the projected 380 km/h has taken the bloom off the opening.

The restriction follows a review by officials stemming from the sacking in February of the railway minister, Liu Zhijun, and the deputy chief engineer of the department, Zhang Shuguang.

The concerns about safety are not at all unwarranted:

Contractors are said to have skimped on using expensive hardening agents when making the concrete for the rail bases. These ties are predicted to crumble within a few years. And there is said to have been a similar shortage of strengthening ingredients included in the concrete used to build bridges and their supporting columns.

A high speed train requires the right-of-way to be engineered to a much higher standard than ordinary passenger or freight rail lines. If too many corners have been cut in this construction, it would be insane to allow the trains to run at full speed until the entire line has been inspected, tested, and problems addressed. If there were even greater “economies” taken during construction, it might not be safe to run the trains at any speed.

And what’s a story like this without a bit of trash-talking from a rival high speed railway operator:

“The difference between China and Japan is that in Japan, if one passenger is injured or killed, the cost is prohibitively high,” he said. “It’s very serious. But China is a country where 10,000 passengers could die every year and no one would make a fuss.”

That’s a quote from the chairman of Central Japan Railway, which runs the Tokyo-Osaka Shinkansen service.

June 11, 2011

China finally admits to (some) problems at the Three Gorges megadam

Filed under: China, Environment, Government — Tags: , , — Nicholas @ 10:47

It’s been “officially” a wonderful thing with absolutely no negative attributes for so long that it’s almost refreshing that the Chinese government is finally admitting it’s not all good news around the massive Three Gorges dam and reservoir:

In private, officials have worried about the project for some time and occasionally their doubts have surfaced in the official media. But the government itself has refused to acknowledge them. When the project was approved by the rubber-stamp parliament in 1992, debate was stifled by the oppressive political atmosphere of the time, following the Tiananmen Square massacre three years earlier. Last July, with the dam facing its biggest flood crest since completion in 2006, officials hinted that they might have overstated its ability to control flooding. On May 18th, with the dam again in the spotlight because of the drought, a cabinet meeting chaired by the prime minister, Wen Jiabao, went further in acknowledging drawbacks.

Having called the dam “hugely beneficial overall”, the cabinet’s statement said there were problems relating to the resettlement of 1.4m people, to the environment and to the “prevention of geological disasters” that urgently needed addressing. The dam, it said, had had “a certain impact” on navigation, irrigation and water-supply downstream. Some of these problems had been forecast at the design stage or spotted during construction. But they had been “difficult to resolve effectively because of limitations imposed by conditions at the time.” It did not elaborate.

June 9, 2011

Is the Shi Lang a naval “Potemkin Village”?

Filed under: China, Military, Russia — Tags: , , , , — Nicholas @ 17:30

David Axe is not losing any sleep over the soon-to-be commissioned Chinese carrier Shi Lang:

Leaving aside her modest size compared to American carriers, her incomplete air wing and escort force and the fact that she’ll sail without the company of allied flattops, Shi Lang could be even less of a threat than her striking appearance implies. Shi Lang’s greatest potential weakness could be under her skin, in her Ukrainian-supplied engines.

Powerplants — that is, jet engines for airplanes, turbines for ships — are some of the most complex, expensive and potentially troublesome components of any weapon system. Just ask the designers of the Pentagon’s F-35 stealth fighter and the U.S. Navy’s San Antonio-class amphibious ships. Both have been nearly sidelined by engine woes.

China has struggled for years to design and build adequate powerplants for its ships and aircraft. Although Chinese aerospace firms are increasingly adept at manufacturing airframes, they still have not mastered motors. That’s why the new WZ-10 attack helicopter was delayed nearly a decade, and why there appear to be two different prototypes for the J-20 stealth fighter. One flies with reliable Russian-made AL-31F engines; the other apparently uses a less trustworthy Chinese design, the WS-10A.

For Shi Lang, China reportedly purchased turbines from Ukraine. Though surely superior to any ship engines China could have produced on its own, the Ukrainian models might still be unreliable by Western standards. Russia’s Kuznetsov, also fitted with Ukrainian turbines, has long suffered propulsion problems that have forced her to spend most of her 30-year career tied to a pier for maintenance. When she does sail, a large tugboat usually tags along, just in case the carrier breaks down.

If Shi Lang is anything like her sister, she could turn out to be a naval version of the mythical “Potemkin village” — an impressive facade over a rickety interior.

H/T to Nicholas “Ghost of a Flea” Packwood for the link.

May 24, 2011

Britain’s entry in the new race to space

Filed under: Britain, Space, Technology — Tags: , , — Nicholas @ 09:12

Jonathan Amos reports on the UK Space Agency (UKSA) long-simmered design/proposal called Skylon:

Skylon has been in development in the UK in various guises for nearly 30 years.

It is an evolution of an idea first pursued by British Aerospace and Rolls Royce in the 1980s.

That concept, known as Hotol, did have technical weaknesses that eventually led the aerospace companies to end their involvement.

But the engineers behind the project continued to refine their thinking and they are now working independently on a much-updated vehicle in a company called Reaction Engines Limited (REL).

Realising the Sabre propulsion system is essential to the success of the project.

The engine would burn hydrogen and oxygen to provide thrust — but in the lower atmosphere this oxygen would be taken directly from the air.

This means the 84m-long spaceplane can fly lighter from the outset with a higher thrust-to-weight ratio, enabling it to make a single leap to orbit, rather than using and dumping propellant stages on the ascent — as is the case with current expendable rockets.

Update: Lewis Page has more on the Skylon project.

May 13, 2011

Would you fly in a glass airplane?

Filed under: Science, Technology — Tags: , — Nicholas @ 08:24

If Professor William Johnson is successful with the new process, you may see lots of structural glass in use:

A new breakthrough in superspeed pulse mould technology will allow aeroplanes, mobile phone casings and suchlike to be made out of a miraculous type of glass which is as tough as metal, according to the inventors of the new process.

So-called “metallic glass” has been well known since 1960 and has been in industrial production since the 1990s. It is a metal alloy, but one with the disordered structure of glass — not formed into crystals the way most metals are.

The crystalline structure of metal is a disadvantage, making it weak. Unfortunately, ordinary glasses — while strong and rigid — generally crack and shatter easily. What’s wanted is a metallic glass, made of metal but with a non-crystalline structure like window glass. This won’t crack or fracture, but will be much stronger than an equivalent object made of ordinary metal.

[. . .]

“We uniformly heat the glass at least a thousand times faster than anyone has before,” says William Johnson, engineering prof at Caltech.

Using this method the metalglass is heated up, moulded and cooled to solid again before crystals have any chance to form: the new part is still metalglass, not rubbishy regular metal.

“We end up with inexpensive, high-performance, precision parts made in the same way plastic parts are made — but made of a metal that’s 20 times stronger and stiffer than plastic,” boasts Johnson.

April 28, 2011

Just for you efficiency fans

Filed under: History, Humour, Technology — Tags: , , — Nicholas @ 11:42

The world’s least efficient machine:

More information about this modern day wonder here.

Learning from mistakes, Martian style

Filed under: Space, Technology — Tags: , , , — Nicholas @ 08:56

I have to admit it’s doubly amusing finding articles like Mars ate my spacecraft!, once for the content and once for the amusing title:

The investigation board made the not-terribly-earth-shaking observation that tired people make mistakes. The contractor used excessive overtime to meet an ambitious schedule. Mars is tough on schedules. Slip by just one day past the end of the launch window and the mission must idle for two years. In some businesses we can dicker with the boss over the due date, but you just can’t negotiate with planetary geometries.

[. . .]

NASA’s mantra is to test like you fly, fly what you tested. Yet no impact test of a running, powered, DS2 system ever occurred. Though planned, these were deleted midway through the project due to schedule considerations. Two possible reasons were found for Deep Space 2’s twin flops: electronics failure in the high-g impact, and ionization around the antenna after the impacts. Strangely, the antenna was never tested in a simulation of Mar’s 6 torr atmosphere.

While the DS2 probes were slamming into the Red Planet things weren’t going much better on MPL. The investigation board believes the landing legs deployed when the spacecraft was 1,500 meters high, as designed. Three sensors, one per leg, signal a successful touchdown, causing the code to turn the descent engine off. Engineers knew that when the legs deployed these sensors could experience a transient, giving a false “down” reading… but somehow forgot to inform the firmware people. The glitch was latched; at 40 meters altitude the code started looking at the data, saw the false readings, and faithfully switched off the engine.

A pre-launch system test failed to detect the problem because the sensors were miswired. After correcting the wiring error the test was never repeated.

H/T to Paula Lieberman for the link.

December 18, 2010

The day the American Falls ran dry

Filed under: Environment, History, USA — Tags: , , — Nicholas @ 13:07

The day Niagara Falls ran dry:

“In June 1969, U.S. engineers diverted the flow of the Niagara River away from the American side of the falls for several months.

“Their plan was to remove the large amount of loose rock from the base of the waterfall, an idea which they eventually abandoned due to expense in November of that year.

[. . .]

To achieve this the army had to build a 600ft dam across the Niagara River, which meant that 60,000 gallons of water that flowed ever second was diverted over the larger Horseshoe Falls which flow entirely on the Canadian side of the border.

“The dam itself consisted of 27,800 tons of rock, and on June 12, 1969, after flowing continuously for over 12,000 years, the American Falls stopped. Over the course of the next six months thousands of visitors flocked to the falls to witness the historic occasion.

I remember seeing this, although as I was nine at the time, I can’t say with certainty that it was in person . . . I might be mistakenly remembering seeing it on TV, although my family visited Niagara Falls frequently during the late 1960s and early 1970s.

September 13, 2010

QotD: An alternate history we might have suffered

Filed under: Government, History, Liberty, Quotations, Technology — Tags: , , , , , — Nicholas @ 17:19

Thought experiment: imagine an Internet in which email and web addresses were centrally issued by government agencies, with heavy procedural requirements and no mobility — even, at a plausible extreme, political patronage footballs. What kind of society do you suppose eventually issues from that?

I was there in 1983 when a tiny group called the IETF prevented this from happening. I had a personal hand in preventing it and yes, I knew what the stakes were. Even then. So did everyone else in the room.

Thought experiment: imagine a future in which everybody takes for granted that all software outside a few toy projects in academia will be closed source controlled by managerial elites, computers are unhackable sealed boxes, communications protocols are opaque and locked down, and any use of computer-assisted technology requires layers of permissions that (in effect) mean digital information flow is utterly controlled by those with political and legal master keys. What kind of society do you suppose eventually issues from that?

Remember Trusted Computing and Palladium and crypto-export restrictions? RMS and Linus Torvalds and John Gilmore and I and a few score other hackers aborted that future before it was born, by using our leverage as engineers and mentors of engineers to change the ground of debate.

[. . .]

Did we bend the trajectory of society? Yes. Yes, I think we did. It wasn’t a given that we’d get a future in which any random person could have a website and a blog, you know. It wasn’t even given that we’d have an Internet that anyone could hook up to without permission. And I’m pretty sure that if the political class had understood the implications of what we were actually doing, they’d have insisted on more centralized control. ~For the public good and the children, don’t you know.~

So, yes, sometimes very tiny groups can change society in visibly large ways on a short timescale. I’ve been there when it was done; once or twice I’ve been the instrument of change myself.

Eric S. Raymond, “Engineering history”, Armed and Dangerous, 2010-09-12

July 22, 2010

The empirical side of engineering

Filed under: Education, Technology — Tags: , — Nicholas @ 07:50

As anyone who’s been paying attention knows, most engineering work is unexceptional and we depend on it working without fuss or bother. Engineers learn what is and isn’t possible with the materials and techniques available, but one of the most important teachers is failure:

The sinking of the Titanic, the meltdown of the Chernobyl reactor in 1986, the collapse of the World Trade Center — all forced engineers to address what came to be seen as deadly flaws.

“Any engineering failure has a lot of lessons,” said Gary Halada, a professor at the State University of New York at Stony Brook who teaches a course called “Learning from Disaster.”

Design engineers say that, too frequently, the nature of their profession is to fly blind.

Eric H. Brown, a British engineer who developed aircraft during World War II and afterward taught at Imperial College London, candidly described the predicament. In a 1967 book, he called structural engineering “the art of molding materials we do not really understand into shapes we cannot really analyze, so as to withstand forces we cannot really assess, in such a way that the public does not really suspect.”

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