Why Are Diesel-Electric Submarines Quieter Than Nuclear Submarines?

#nuclearsubmarine #dieselsubmarine #aipsubmarine
The original Post: navalpost.com/nuclear-submari...
Why Are Diesel-Electric Submarines Quieter Than Nuclear Submarines? Are They Quieter In Both Diesel And Electric Mode, Or Just Electric?
The motion makes noises. When underwater objects vibrate, they create sound-pressure waves that alternately compress and decompress the water molecules as the sound wave travels through the sea. Sound waves radiate in all directions away from the source like ripples on the surface of a pond.
When moving, the shaft of the submarine rotates and it makes a noise at the rotation rate. It’s called the shaft rate. If a rotating machine rotates at 3,600 RPM, it’s rotating 60 times per second. Since no machine is perfect, any small error in the machine at one spot will cause a slight change in the noise it makes. That generates a tone. That tone would be 60 Hz. If that machine is mounted to to the hull of a ship or submarine, the hull will act like the cone of the speaker in your home sound system and make a sound wave in the water.
If the machine is a rotary pump, it makes noise for how often the vanes pass one point. For example, if the pump has 5 vanes, it will make a tone at 300 Hz.
All rotary machinery make a similar noise. For example, if the motor has 12 rotor windings, it will emit a tone at 720 Hz.
This method also works for a ship’s propellers. If the screw is turning 120 RPM, the Shaft Rate would be 2.0 Hz. If it had six blades, the Blade Rate would be 12 Hz. Since 12 Hz is a harmonic of 2 Hz, the blade rate and sixth Shaft Rate would reinforce each other, making the Blade Rate much stronger.
This list can be expanded with all the equipment on the submarines that has moving parts.
That sound wave travels a long way (because of its low frequency) and can be detected by any hydrophone (a microphone in the water). Eliminating these sounds is the key factor to keep your asset undetected.

[@zubairhanif9478]

Voice needs to be improved

[@vxrdrummer]

Naval ASMR. Awesome.

[@zaidalani5793]

Impressive

[@fjs1111]

You spelled "quieter" wrong in the thumbnail.

[@soneravsar4039]

👏👏👏

[@aishaishnazarova5083]

👏🏻👏🏻❤️

[@johnrussell3755]

I DONT UNDERSTAND WHAT IS SHE SAYING SO I JUST SKIP THE VIDEO..

[@abdusshahib]

comentry sucks

[@shovington67]

The audio and narration in this video are absolutely horrible. The vocal has an unnatural spike at 240hz to 300hz, masking much of what's being said. Also the inflections and emphasis of the narrators voice is completely baffling for an English language video. The voice is meek and monotone. The production is cheap, careless, and distorted. All of this could have been remedied in post production to some extent, but its the choice of narrator, trimming the input sensitivity of the vocal microphone, and equalization on the channel strip that would have made the difference. Unfortunately, and this is no fault of the narrator, but understanding the topic of which you're narrating is of obvious importance, when making an informational and educational video.
I was really looking forward to the information in this video. So disappointed...