UDT 2020 ASW using LWTs from Submarines ORUWA / Thomas Petersson - - PowerPoint PPT Presentation

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UDT 2020 ASW using LWTs from Submarines ORUWA / Thomas Petersson - - PowerPoint PPT Presentation

Nov 03, 2023 435 likes •632 views

UDT 2020 ASW using LWTs from Submarines ORUWA / Thomas Petersson 2020-02-25 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1 ASW Using LWTs from Submarines Background ASW The

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

UDT 2020

ORUWA / Thomas Petersson 2020-02-25

ASW using LWTs from Submarines

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

ASW Using LWTs from Submarines

  • Background
  • ASW – The Challenge
  • ASW from Surface Units
  • ASW from Submarines
  • LWTs on Submarines
  • Current Swedish LWTs
  • Summary

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Background – HWTs in Sweden

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Operational

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

Background – LWTs in Sweden

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Operational and New

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

Background – LWTs in Sweden

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Surface Ship Craft of Opportunity Aircraft Submarine

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

ASW – The Challenge

  • In blue waters:
  • Few problems exist with hydro acoustic disturbances

caused by reverberation and other sources of noise.

  • When a target is detected, the possibilities to

escape are limited.

  • A fire-and-forget torpedo can be used effectively.

The launch trajectory and the time required to enter a controlled and stable run are less critical.

  • A torpedo must be dimensioned to sustain the water

pressure when combating deep sea targets.

  • In shallow waters:
  • Reverberation from the surface and from the seabed,

and other sources of noise, are frequent.

  • Influence from sound-velocity gradients are generally

larger, meaning that significant refraction occurs.

  • A submarine can hide near or on the seabed,

in areas where seabed reverberation is high.

  • The systems must be designed for shallow waters

and a complex hydro acoustic environment.

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X Y Z

X Y

In deep waters the distance to the target can be in the same order of magnitude as the water depth. This can be generalised into a three dimensional scenario (X-Y-Z volume). In shallow waters the combat- and detection ranges can be much greater than the depth. Here the majority of actions take place over a horizontal area. This can be generalized into a two dimensional scenario (X-Y plane).

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

ASW – The Challenge

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Sound Velocity

Shadow Zone

Distance from the transmitter Sound Velocity Distance from the transmitter

Baltic Sea - Winter Conditions

Distance from the transmitter Sound Velocity

Shadow Zone

Shadow Zone Sound Velocity Distance from the transmitter

Baltic Sea - Summer Conditions

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

ASW from Surface Units

  • In Anti-Submarine Warfare (ASW) from a surface unit

there is an asymmetry between hunter and target:

  • The detection range for a Hull Mounted Sonar (HMS)
  • r a Dipping Sonar (DS) can be extremely reduced.
  • The submarine takes advantage of

hydro-acoustic shadow zones.

  • The surface units may be affected by adverse weather

conditions and hostile activities.

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

ASW from Submarines

  • In Anti-Submarine Warfare (ASW) from a submarine the

asymmetry between hunter and target is reduced:

  • The detection ranges for the submarine sensors

(FAS and CAS) are comparable.

  • Both submarines can utilize hydro-acoustic shadow zones

to their advantage.

  • Both submarines operate in the same environment and are

not affected by the sea state and weather conditions.

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

LWTs on Submarines – Dedicated Tubes

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VGD Class Arrangement 6 x HWT Tubes 3 x LWT Tubes (x 2 Torpedoes) Total: 6 + 6 Torpedoes (RTF) GTD Class Arrangement 4 x HWT Tubes 2 x LWT Tubes (x 2 Torpedoes) Total: 4 + 4 Torpedoes (RTF)

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

LWTs on Submarines – 53 cm Tubes

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For integration of LWTs

  • n submarines equipped

with HWT tubes.

A tube insert that can be handled as a unit load is used to adapt the existing 53 cm torpedo tubes to the LWTs.

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

LWTs on Submarines – Dedicated Tubes

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Torpedoes are taken

  • nboard using the same

systems and methods as used for HWTs.

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

LWTs on Submarines – Logical Integration

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GTD Class Arrangement 4 x HWT Tubes 2 x LWT Tubes (x 2 Torpedoes) Total: 4 + 4 Torpedoes (RTF)

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

Current Swedish LWTs

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Torpedo 45 Torpedo 47

ASW/(ASuW) ASW/(ASuW)

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

Current Swedish LWTs - Tp47 Overview

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FLS Proximity Fuse Stator / Rotor / Duct Warhead Computer & Electronics Battery

(Lithium Iron Phosphate) Wire / Fibre Magazine

Connector Motor Servos / Rudders FLS Electronics SAI Torpedo 47 Key Features

  • Homing System Resolution
  • Communication by Wire
  • Wide Speed Range
  • Neutral Buoyancy
  • Endurance
  • Silent Run
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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

LWTs on Submarines – Benefits

  • From an operational perspective
  • Optimized solution using a submarine for ASW
  • Provides a secondary additional ASuW capability
  • Can be used as a self defence weapon
  • Evolutionary use as an Anti-Torpedo Torpedo (ATT)
  • From a logistics perspective
  • Weapon system with smaller on-board footprint
  • Increases the number of ready to fire torpedoes
  • From a design perspective:
  • Robust and can withstand higher shock-loads

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

Summary

  • LWTs on Swedish Submarines
  • Utilizes dedicated smaller torpedo tubes
  • Have been operational for decades
  • A Tube Insert can be used for integration
  • Can be handled as a unit load
  • Compatible with existing HWT handling systems
  • Flexible use of the fixed HWT tubes
  • Using LWTs from submarines
  • Smaller on-board footprint
  • Increased number of RTF torpedoes
  • Robust system
  • Additional self defense capability

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COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1

Thank You

Thomas Petersson / ORUWA