PLAN Type 035/039/091/092 Submarine Thread

[Pointblank]

Re: PLAN submarines Thread II

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

I'm saying Stirling. Why?

The technology is simple and easy to construct. It's also relatively safe technology compared to other well understood types. The Chinese haven't got much headway into fuel cell technology so we can exclude that technology from the list of AIP. Endurance is also very good with the system compared to the alternatives, except for fuel cell.

 

[lilzz]

Re: PLAN submarines Thread II

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.

What if I use computered generate Random Harmonic Sound syntheizer. The wave form would composed many frequencies and it base on random seed.
So each time the generated sound is random.

 

[Ambivalent]

Re: PLAN submarines Thread II

What if I use computered generate Random Harmonic Sound syntheizer. The wave form would composed many frequencies and it base on random seed.
So each time the generated sound is random.

You mean much like the background noise in an ocean. The processing equipment is usually able to filter out white noise and the like, depending on the relative intensities of the background noise and emissions from the target. Keep in mind however that a white noise point source would be a very nice datum and would itself stick out from background noise.

 

[crobato]

Re: PLAN submarines Thread II

I'm saying Stirling. Why?

The technology is simple and easy to construct. It's also relatively safe technology compared to other well understood types. The Chinese haven't got much headway into fuel cell technology so we can exclude that technology from the list of AIP. Endurance is also very good with the system compared to the alternatives, except for fuel cell.

Stirling is the most likely powerplant but that's most likely due to cost ratio. But China isn't behind in fuel cell techonlogies. Tell Volkswagen that when they turned a fuel cell car project lately to Chinese scientists.

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[lilzz]

Re: PLAN submarines Thread II

Originally Posted by lilzz
What if I use computered generate Random Harmonic Sound syntheizer. The wave form would composed many frequencies and it base on random seed.
So each time the generated sound is random.

You mean much like the background noise in an ocean. The processing equipment is usually able to filter out white noise and the like, depending on the relative intensities of the background noise and emissions from the target. Keep in mind however that a white noise point source would be a very nice datum and would itself stick out from background noise.

No, it's not background noise

The equation for that would be

Sound Wave=f+2f+3f+4f+5f+6f+.............
f is the fundamental frequency and it's random seed. could be 14mhz this time
or could 34khz next....

so, the Sound Wave equation still stands, it makes up of many harmonics.

You can't filter that as noise because it has a linear equation. But the seed or fundamental frequency is random.

If I put this sound synthesizer on the sub, I bet none of the sound operator would encounter this before:roll:

 

[lilzz]

Re: PLAN submarines Thread II

Does PLAN have plans to field 4-5 nuke attack sub on SSF with long range land attack cruise missile? 093 or 095?

 

[Skywatcher]

Re: PLAN submarines Thread II

Probably the 095, which I think has VLS.

 

[challenge]

Re: PLAN submarines Thread II

most of PLAN submarine still based on obsolete design,notice even 094 contain alot of drainage hole.compare that with modern western attack sub are all very smooth.
according to old issue of IDR,drainage hole generate noise during underwater
cruising.this can be easily pick up by passive sonar.also it created higher "echo".making the sub vulnerable of being detect by active sonar or homing torpedo.
the other problem was the level of automation, machinery room for modern warship (incluidng submarine)are fully automated or computerization,by contrast russian and Chinese warship still needed a large number of crews to monitor the machinery.

 

[Totoro]

Re: PLAN submarines Thread II

I'm not so sure about the drainage hole problem. Other, modern western subs have them too, its just that they positioned differently so they're less visible on pictures. Japanese Oyashio subs have them positioned lower, so they're mostly underwater and not noticable when the sub is not in dry dock. Newest british attack subs, astute class, also have them alongside whole body - here they're even somewhat high up and could be noticed even when sub is in the water.

 

[Skywatcher]

Re: PLAN submarines Thread II

Pictures of the Xia show it with the drainage holes closed, if that helps.