09III/09IV (093/094) Nuclear Submarine Thread

[Hyperwarp]

I appreciate the effort and I don't have any comment as to the projected dates and noise level association projections.

However I think it would be useful to use the designations of 09III and 09V etc with the PLA standard for Roman numerals when referring PLAN nuclear subs for your chart seeing as you put the effort for making the chart.

Crap! Completely overlooked that.

My mistake. I'll reupload an updated version.

 

[Hyperwarp]

Check the 'commissioned' dates. 09IIIB doesn't seem to have started according to this post - Post #2141 by Hendrik_2000. I lets assume it starts end of this year, and completed extremely fast.

09I - commissioned (1974)
09III - commissioned (2006)
09IIIA - commissioned (2015)
09IIIB - ? (Production starts end of 2019?)
09V - ? (Unknown)

Updated chart -

 

[jobjed]

Check the 'commissioned' dates. 09IIIB doesn't seem to have started according to this post - Post #2141 by Hendrik_2000. I lets assume it starts end of this year, and completed extremely fast.

09I - commissioned (1974)
09III - commissioned (2006)
09IIIA - commissioned (2015)
09IIIB - ? (Production starts end of 2019?)
09V - ? (Unknown)

Updated chart -

The 091 and 092 retain Arabic numerals. It's only from 09III on that the designation system switched to roman numerals. Other than that, I quite like the graphic.

 

[Totoro]

Considering we had that article claiming 093 features natural circulation, considering no LA/improved class design uses natural circulation, considering 093a enjoys some 30 years of computer related advances over improved la class, including advances in computer milling machines, precision machinery of high tolerance and various computer aided simulations of propeller shape and cavitation, I really wouldn't be surprised that in a few decades we get articles that 093a was, in fact, quieter than improved la class (as it first appeared) all this time.

 

[ZeEa5KPul]

I wonder about something: Is it possible that submarines make more noise in peacetime (when they're not on an intelligence gathering mission) to obfuscate their true wartime stealth? Like how stealth fighters use Luneberg lenses to amplify their RCS.

 

[Anlsvrthng]

Considering we had that article claiming 093 features natural circulation, considering no LA/improved class design uses natural circulation, considering 093a enjoys some 30 years of computer related advances over improved la class, including advances in computer milling machines, precision machinery of high tolerance and various computer aided simulations of propeller shape and cavitation, I really wouldn't be surprised that in a few decades we get articles that 093a was, in fact, quieter than improved la class (as it first appeared) all this time.

The sound emission of a submarine most likely depending on the resonant vibration frequency of component, and that require either increased damping by using multiple , different critical frequency plates, or using mass for damping.

So, a successful submarine design should take care to separate the submarine components by resonant frequencies, and making sure between the component and the sea there is no single common resonant frequency.

This should takes lot of theoretical calculation, full scale experiments and so on.

 

[taxiya]

The 091 and 092 retain Arabic numerals. It's only from 09III on that the designation system switched to roman numerals. Other than that, I quite like the graphic.

Regardless 1,2 or I, II, the type is 09. Using Arabic numerals after 09 would be confused to type 091 and 092 which was never PLAN's designation. Besides, we have never seen official publication using either numerals. 091 or 09II are all outsiders usage. Therefor, for our convenience only.

As of the switching, what is the story of it? when was it changed? Can you elaborate? I am just curious.

P.S. here is an article in Chinese (if you read) which is quoting a report from PLA daily

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The reason of "type" 09 was because the nuclear sub program was the "number 9 (critical) program", so all nuclear subs are "type" 09.

 

[Anlsvrthng]

For simple house window, the combination of different glasses can create different sound reduction for every freqency.

Example the 4mm/4mm window is more effective to dump the low frequency than the 8mm/6mm ( high frequency doesn't an issue ,that is easy as visible )

And the window is extremely simple compared to a very complicated structure like a submarine.

 

[Tetrach]

Year seems right, but we literally have zero knowledge on the noise level of all of these subs

 

[Tam]

I wonder about something: Is it possible that submarines make more noise in peacetime (when they're not on an intelligence gathering mission) to obfuscate their true wartime stealth? Like how stealth fighters use Luneberg lenses to amplify their RCS.

Yes.

And also that submarines are not just different in noise levels per class, or subclass, but even individually among sisters, and even if the submarine goes into a refit.