Academic Articles & Supplements

Annular Accelerometer Sensors between the Stiffeners of a Submarine to Monitor Its Acoustic State and Listen to Its Neighbors

Dominique BRENOT

Author

Dominique BRENOT

Title

Annular Accelerometer Sensors between the Stiffeners of a Submarine to Monitor Its Acoustic State and Listen to Its Neighbors

Description

Annular sensors between the stiffeners of a submarine to monitor its acoustic state and listen to its neighbors

Annular Accelerometer Sensors between the Stiffeners of a Submarine to Monitor Its Acoustic State and Listen to Its Neighbors

Dominique BRENOT

In order for a submarine to know its own radiated noise and listen to its neighbors as discreet as itself up to 295 km, we propose to have between several of its stiffeners six rings of accelerometers, each of which is connected to two late lines. All these delay lines are connected to two summators providing audible signals on the way out. The first is the noise the submarine emits forward. The second is the noise it emits backward. The difference between these two signals is a third audible signal. Not only it attenuates the own noise of the submarine but it has the virtue of annihilating its own echoes, attenuating echoes coming from a submarine in far field and being an excellent listening signal of this later. Indeed, as soon as a plane wave from another submarine located in a distant field enters the front or the rear of the submarine, the entry signal amplifies considerably throughout the course of the wave over the entire body of the submarine, which constitutes not only an amplifier antenna, up to 150 dB compared to the sound received on the sonar, but also an echo killer. Reference[26] and Reference[27] are two large simulations carried out with Mathematica and using data from Le Redoutable.

Reference[26]

T - beam radius of gyration calculations


NATURAL FREQUENCIES WITH COUPLING (f0, f4)


FRÉQUENCES PROPRES SANS COUPLAGE (f0, f4)


Reference[27]

Simulations


Frequency f0


Fréquence f4


Etude des modes locaux


Tracé sur les 2 premiers des 15 raidisseurs
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Cite this as: Dominique BRENOT, "Annular Accelerometer Sensors between the Stiffeners of a Submarine to Monitor Its Acoustic State and Listen to Its Neighbors" from the Notebook Archive (2022), https://notebookarchive.org/2022-06-7d0a47k

Annular Accelerometer Sensors between the Stiffeners of a Submarine to Monitor Its Acoustic State and Listen to Its Neighbors

T - beam radius of gyration calculations

NATURAL FREQUENCIES WITH COUPLING (f0, f4)

FRÉQUENCES PROPRES SANS COUPLAGE (f0, f4)

Simulations

Frequency f0

Fréquence f4

Etude des modes locaux

Tracé sur les 2 premiers des 15 raidisseurs

T - beam radius of gyration calculations


NATURAL FREQUENCIES WITH COUPLING (f0, f4)


FRÉQUENCES PROPRES SANS COUPLAGE (f0, f4)


Simulations


Frequency f0


Fréquence f4


Etude des modes locaux


Tracé sur les 2 premiers des 15 raidisseurs
