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for Marine Applications Chris Watts, Technology Acquisition Lead, - - PowerPoint PPT Presentation

Dec 05, 2022 224 likes •426 views

An Electromagnetic Payload Launcher for Marine Applications Chris Watts, Technology Acquisition Lead, Babcock DST Strictly Private and Confidential Introduction Electromagnetic launch using Linear Induction Motors (LIMs) to launch a

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An Electromagnetic Payload Launcher for Marine Applications

Chris Watts, Technology Acquisition Lead, Babcock DST

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Introduction

An Electromagnetic Payload Launcher for Marine Applications

  • Electromagnetic launch – using Linear Induction Motors (LIMs) to launch a payload
  • Ability to launch a range of

different payloads

  • Adaptable to varying launch

requirements and conditions

  • Specific focus on EM fields

generated in the payload area – modelled and verified with experimental testing

  • Test rig designed and built to demonstrate performance and compliance to

applicable standards

  • Simulation and FEA model used for design and performance prediction
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EM Launch Benefits

Simple – control system uses COTS components, DOL or standard motor drives

An Electromagnetic Payload Launcher for Marine Applications

Low maintenance – minimal to zero requirement, with no high pressure systems Controllable – exit speed and acceleration can be controlled to suit the specific payload and conditions High reliability – only one moving part coupled with mature linear motor technology Adaptable – can be scaled to launch payloads of varying size and mass

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Underwater Defence Applications

An Electromagnetic Payload Launcher for Marine Applications

  • Torpedo launch
  • Mine launch
  • Acoustic countermeasures
  • Submerged signal ejectors
  • UUV launch
  • Special forces deployment
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Safe Energy Density Levels

BR2924 identified as worst-case Applicable standards:

  • MIL-HDBK-240A (HERO)
  • BR2924 (surface &

underwater)

  • DEF Stan 59-411
  • JSP 482 Edition 4
  • STANAG 4234

An Electromagnetic Payload Launcher for Marine Applications

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Launcher: Launch payload at required exit velocity Features: Linear motors, DC brake, low friction rails Payload: Dummy payload to represent lightweight torpedo Features: Accelerometer mounted externally Catcher: Arresting the payload after launch Features: High friction rails, modular structure

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Test Rig

  • Full scale test rig used to launch a dummy payload of identical dimensions and mass to a

lightweight torpedo

  • Aim to demonstrate electromagnetic compliance with applicable standards, specifically

BR2924, using EM field measurement equipment on the test rig over multiple launches

An Electromagnetic Payload Launcher for Marine Applications

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Ansys Maxwell FEA Model

An Electromagnetic Payload Launcher for Marine Applications

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Ansys Maxwell Performance Prediction

An Electromagnetic Payload Launcher for Marine Applications

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Ansys Maxwell Flux Density Areas

1. LIM teeth 2. Back iron 3. C beams housing the LIMs 4. Airgap 5. Actuation fin 6. Payload 7. Payload internal volume

An Electromagnetic Payload Launcher for Marine Applications

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Ansys Maxwell Flux Density Magnitude

An Electromagnetic Payload Launcher for Marine Applications

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Ansys Maxwell Flux Density Plots

An Electromagnetic Payload Launcher for Marine Applications

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Ansys Maxwell Flux Density Plots

An Electromagnetic Payload Launcher for Marine Applications

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Launch Video

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Measured Launch Parameters

An Electromagnetic Payload Launcher for Marine Applications

Measured parameters Current, Acceleration, Velocity Simulated parameters Current, Acceleration, Velocity

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Measuring EM Fields

This enables a full-load launch with measurement of EM fields in the area of interest

An Electromagnetic Payload Launcher for Marine Applications

Test rig reconfigured for EM fields measurement

  • Bespoke method of measuring fields using off-the-shelf equipment
  • Pusher bracket on actuation fin turned around
  • Payload positioned in front of the fin instead of above it
  • Field probes placed above the LIMs and the fin where payload would normally be
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Analysis of EM Fields Data

Measured fields in comparison to limit based on BR2924

An Electromagnetic Payload Launcher for Marine Applications

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Conclusions

  • Proven ability to launch payload at specified exit speed
  • Demonstrated consistent and reliable operation – over

100 launches completed with no maintenance

  • Impact on power supply determined by overall system

level capabilities (energy storage could be provided)

  • Proven adaptability for various payloads and launch
  • requirements. i.e. torpedo variants, UUVs
  • Ability to accurately predict performance using FEA

model and simulation techniques

  • Demonstrated that EM fields generated by the launcher

are below threshold of applicable standards

An Electromagnetic Payload Launcher for Marine Applications

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Further Work

  • Continue to improve the model and

simulation techniques to aid with further development and accurately predict performance characteristics

  • Investigate alternative interface and

release mechanisms for a wide range

  • f payloads
  • Investigate system application under

water using modelling techniques to simulate submerged LIMs

An Electromagnetic Payload Launcher for Marine Applications

  • Develop roadmap for underwater concept design, considering a range of possible

payloads (e.g. heavyweight torpedoes, mines, countermeasures, UUV)

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