PLAN Type 035/039/091/092 Submarine Thread

Re: PLAN submarines Thread II

Pointblank said:

A good sonar operator and a good set of equipment and sound processors can filter noise makers out very quickly; remember, the sets used on our sonars are very similar to those being used for oceanographic research; they have to filter out background and other unrelated noises and detect very faint sources of sound being masked by ocean conditions.

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On an open ocean, not on littoral waters. Furthermore, conditions are different, different ecology, different water systems, so that the experience you get from working on the Baltic Sea won't work on the South China sea and vice versa.

Re: PLAN submarines Thread II

Pointblank said:

And in the great game of nuclear chicken, being forewarned about a war is a luxury. Those subs would be dead after their shadows fire their torpedoes at a easy to find target before they would have a chance to return to port. And to remove something large from a submarine would require a few weeks worth of dry dock. Not worth it.

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These are not 70's era Soviet tin cans, nor are they 80's era Chinese Hans.

Even in the ocean, probably only the Seawolf and Virginia can shadow Type 094 like you suggest. No photo of the Type 094 has ever been circulated on public internet

In the Asian littorals? With a zillion ships of all sizes and complex terrain? No way!

Re: PLAN submarines Thread II

crobato said:

On an open ocean, not on littoral waters. Furthermore, conditions are different, different ecology, different water systems, so that the experience you get from working on the Baltic Sea won't work on the South China sea and vice versa.

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We are aware that the Americans have been surveying the South China Sea for the past decade or more; we don't know what the Americans know about the region, and thus cannot pass judgement. We can definitely say that they are aware of the conditions in the region.

Re: PLAN submarines Thread II

Pointblank said:

We are aware that the Americans have been surveying the South China Sea for the past decade or more; we don't know what the Americans know about the region, and thus cannot pass judgement. We can definitely say that they are aware of the conditions in the region.

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You need more than that. You need subs and ships to exercise on the region constantly, and remember, crews also rotate, which means crews that were experienced with it may have moved on to other careers and you have to retrain new crews. Even the sea is subject to seasonal variations that can cause changes in water acoustics and biologics.

Re: PLAN submarines Thread II

tphuang said:

in the future, can you provide some real summary rather than just posting these videos? A lot of people here don't understand mandarin.

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This is a SINOdefence forum ; obviously some form of mandarin comprehension is expected . There are heaps of knowledge out in the real world that isin a language other than English

Re: PLAN submarines Thread II

That's why it should be translated, so those that don't understand Mandarin can contribute to the discussion.

Re: PLAN submarines Thread II

marclees said:

This is a SINOdefence forum ; obviously some form of mandarin comprehension is expected . There are heaps of knowledge out in the real world that isin a language other than English

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This is an English language forum and I should know this since I'm one of the moderators. We have numerous moderators who don't know Chinese (I'm not one of them) and we have many long time posters who don't either. It's up to the poster to explain the Chinese posts.

Re: PLAN submarines Thread II

lilzz said:

Not so easy. How you know that noise is not from the engine. Maybe that noise is part of system shouldn't be filter out. That's tough call to differentiate what noise is non-related and what noise is intrinsic. You don't have exact system so how do you do know what to expect beforehand?

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Each noise making part of the sub will generate an audio signal at certain frequencies. A sub will have what is called a waterfall display. It is a series of rows, one for each frequency. If there is a noise at a certain freq, there will be a horizontal line from left to right at the row corresponding to that frequency. The line will increase in size with intensity. Each sub or surface ship will have very specific audio qualities that are glaringly apparent on the waterfall display. A trained sonar operator, regardless of whether or not he just cruised a particular boat or region of the ocean, will recognize these patterns. Individual ships and subs within a class will have specific noises unique to that unit. One sub might have a noisy compressor on a galley freezer unit, another might have a noisy recirculation pump on a reactor, etc, and these differences are recorded as each vessel cruises and entered into a digital threat library that is distributed to all US ships and to certain trusted allies. A skilled operator can see the threat on the waterfall display usually, but the threat library will give a certain response, often identifying the individual unit of a class.

Re: PLAN submarines Thread II

Someone posted this picture of what is apparently a New Yuan. There have been at least 4 so far, so this would have to be at least the 5th one. Anyhow, they claim there is some differences between this and the last batch of 3. I honestly can see much other than the limber holes look to be slightly different and some anechoic tiles are off right now. There is also something between the window and diving plane of the sail, which was not present in Yuan block 02. Anyhow, I uploaded 2 pictures. One is the boat and the other is the differences between 1st and 2nd Yuan sub.

Re: PLAN submarines Thread II

I wish there was a way to figure out what sort of AIP is installed on the Yuan.