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China’s Submarine Fleet, Evolution & news

Researchers working on a new system they hope will be more effective in hiding submarines from detection under the sea

PUBLISHED : Monday, 05 December, 2016, 9:05am
UPDATED : Monday, 05 December, 2016, 10:24am

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Chinese scientists are developing a technique they hope will be able to make submarines invisible to sonar detection under the sea.

If successful, it would ultimately involve covering subs with special rings made of aluminium alloys.

The researchers at the Chinese Academy of Sciences in Beijing and Huazhong University of Science and Technology in Wuhan in Hubei province experimented with rings about 14 cm across and with periodically etched grooves.

They found that sound waves were guided around the rings rather than bouncing back, which would allow them to be traced by sonar detectors.

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The grooves were able to steer the sound waves in a set direction like cars travelling on an expressway.

The researchers published details of their work earlier this month in the scientific journal Nature Communications.

‘Underwater Great Wall’: Chinese firm proposes building network of submarine detectors to boost nation’s defence

The scientists were originally using the technology - called a topological insulator - to control the movement of electrons to reduce heating in computer chips, but they later realised it also had applications for sound waves.

Several rings could work together to direct sound waves in almost any direction, potentially hiding a submarine from sonar in the future.

Other researchers have been working on the technology, but the Beijing and Huazhong researchers said their system was the simplest.

A research team at Nanyang Technological University in Singapore constructed an array of cylinders creating similar effects last years, but they had to spin at high speed, about 400 revolutions per second, to keep the sound on a strict course.

The Singaporean team also claimed their technology could help submarines evade sonar detection, but planting a large number of spinning cylinders over the hull of the craft could prove an engineering nightmare.

“Our method is simpler. It does not require moving parts,” said one author of the Chinese paper, who asked not to be named.

However, he added that many problems remained to be solved before the technology can be used outside the laboratory on submarines or to reduce noise on aircraft.

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Submarines now use used a rubber or plastic coating to absorb sound waves produced by sonar.

The anechoic tiles also reduce noises produced from inside the sub, but the technology is old, first used by the Germany navy in U-boats during the second world war.

New materials have been developed over the decades to increase the absorption rate, but a powerful and sensitive sonar system can still pick up traces of vessels.

China and US in silent fight for supremacy beneath waves of South China Sea

Yang Jing, associate professor of acoustics at Nanjing University, said the topological insulator could trigger a revolution in acoustic studies.

“It has borrowed many ideas from quantum physics, which shed new light on sound problems,” she said.

But the technology was still in its infancy with major problems remaining, said Yang, who was not involved in the rings research.

For instance, a submarine has to remain invisible from sonar beamed from different directions and at different frequencies.

The rings, however, are now only able to deflect sound waves coming from certain angles and within certain frequencies.

http://www.scmp.com/news/china/poli...arch-might-help-shield-submarines#add-comment
 

Do I have it correctly: the current Type 039B is being launched while the newer Type 039C (depicted with the X-shaped rudders) is still in construction? Are multiple 039C being built?
 
Do I have it correctly: the current Type 039B is being launched while the newer Type 039C (depicted with the X-shaped rudders) is still in construction? Are multiple 039C being built?

It seems that at lesast 3 Type 039C (??) are being constructed now. 2 already launched and 1 still in dry dock.

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Henri K.
 
It seems that at lesast 3 Type 039C (??) are being constructed now. 2 already launched and 1 still in dry dock.

b9BsFVg.jpg


Henri K.

Interesting ... so the Type 039C do not have the X-shaped rudder arrangement (unlike what is posted in the photo).
 
Do I have it correctly: the current Type 039B is being launched while the newer Type 039C (depicted with the X-shaped rudders) is still in construction? Are multiple 039C being built?

It says that a certain production line has been idle for 3 years now after producing the last batch of 039Bs, but recently there's news that a certain new type of conventional sub is beginning construction, indicating that this production line is being restarted.

I think it's hinting that the 039C has started construction.
 
It says that a certain production line has been idle for 3 years now after producing the last batch of 039Bs, but recently there's news that a certain new type of conventional sub is beginning construction, indicating that this production line is being restarted.

I think it's hinting that the 039C has started construction.

The restarted construction could be referring to the recently-launched 039Bs, though.
 
095 already in progress, new production facility for 096 (ZT微博 木边鱼095可能已经在老线开工,新产房是为096准备的(二次更新,土匪说09)
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5不会有泵推,X尾舵)

What does "in progress" mean in this context? Is the Type 09-V already under construction?
 

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