Pyro-MEMS Technological breakthrough in fuze …...Pyro-MEMS Technological breakthrough in fuze...

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Pyro-MEMS Technological breakthrough in fuze domain ------------------ Fuze Conference 2009 Renaud Lafont Lake Buena Vista, FL 20 th of May 2009 Approuved for public release

Transcript of Pyro-MEMS Technological breakthrough in fuze …...Pyro-MEMS Technological breakthrough in fuze...

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Pyro-MEMSTechnological breakthrough in fuze domain

------------------Fuze Conference 2009

Renaud Lafont Lake Buena Vista, FL 20th of May 2009

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Content

1. NEXTER Munitions Fuze activities

2. Design & Demonstration of MEMS SAU

3. Design & Demonstration of 25mm Airburst ammunition Mk I

4. Design & Demonstration of 25mm Airburst ammunition Mk II

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1. NEXTER Munitions Fuze activities

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NMu: Fuzing System manufacturer

Products: Fuzing system & SAU for missile, tank ammunition (120, 100, 90 mm caliber), naval artillery (100mm caliber) and medium caliber (40, 30 and 25 mm caliber).

Strengthes:

►Pyrotechnical components manufacturer (primary & secondary)

►Own proving ground

►The complete munition designer

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NMu: Fuzing System designer

Applications:

► Airbursting ammunition

► Opto-Pyro

► LEEFI

►…

Strengthes:

►Modelisation

► Data recorder

► Own proving ground (static, pyrotechnics, dynamic)

► Same group than weapon system designer (NEXTER Syst ems)

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1) Design & Demonstration of MEMS SAU

Contract 03.04.078 – Demonstration of miniaturized SAU

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1) MEMS SAU

Technology MEMSTechnology MEMS

Pyrotechnical interruption

Miniaturized Electronic driver

STANAG 4187 compliance

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The Step Forward

Requirement

03/2007 – delivery of 10 µ-SAU

�������� Pyrotechnical safety managed by electronically controlled MEMS ���� Volume less than 2 cm 3

���� In accordance with STANAG 4187 (last edition)���� Ignition of EIDS���� Low cost���� Generic SAU

Micropyrotechnics, Synergy of mechanics, electronics & pyrotechnics

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Arming ability and reversibility

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MEMS design according to STANAG 4187 requirements

ARMED

SAFE

1st Safety lock

2nd Safety lock

Arming displacement

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Environnemental conditions :

►120mm ammunition Polynege ( Laser guided tank ammunition) firing (~10 000 g)

View of the actuators after firing

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1) MEMS SAU

Technology MEMS

Pyrotechnical interruptionPyrotechnical interruption

Miniaturized Electronic driver

STANAG 4187 compliance

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Reliability and safety perfromances obtained by hardened tests (GTPS)

►Reliability : 0,999 with 75 % confidence level

►Safety : 0,9999995 with 90 % confidence level

► Interruption test on PETN booster

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Pyrotechnical tests

Detonator

MEMS

SAU body

VIDEO

Transmission Interruption

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1) MEMS SAU

Technology MEMS

Pyrotechnical interruption

Miniaturized Electronic driverMiniaturized Electronic driver

STANAG 4187 compliance

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High density PCB

►8 layers

►High density of parts

►« In Pad » vias

► In board vias

►« Flex » PCB

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Integration

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Integration

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1) MEMS SAU

Technology MEMS

Pyrotechnical interruption

Miniaturized Electronic driver

STANAG 4187 complianceSTANAG 4187 compliance

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Compliance with STANAG 4187

�Two independant safety devices [Exg 6.a).1] : OK�Two independant orders to authorize arming

sequence [Exg 6.a).1] : OK�Physical shutter between detonator and booster [Exg

8.a).1] : OK�Explosive assessment and approval : COTS

pyrotechnical devices OK [Exg 7.a)] : OK�Efficiency of the interruption of the micro scale f ire

train : OK [Exg 8.a).2] : OK�Non-armed guaranty during assembly and

installation : [Exg 12.a)] : electrical information about shutter status is available

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1. Design & Demonstration of 25mm Airburst ammunition-Mk I

Contract n°05.50.208 – Improvements of medium calibre ammunition

Demonstrator for a programmable air bursting 25 mm round

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Aims of the study

►Airburst has to be initiated above the target with an accuracy of 1 m at 1000 m

►Airburst mode shall be compliant with the maximal rang e of the 25, 30 and 40 mm weapons

► Impact mode available

►Compliance with STANAG 4187

►Airburst Fuze Programming Unit shall be able to equip existing weapons systems (retrofit)

Traditional PDReduced efficiency

Programmed ABImproved efficiency

Mk I

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►Programming Unit�Inductive coil (Mode + Chronometry)�Impact mode remains available without

programming unit►Operational modes

�Airburst +PD +Self-destruct►Airburst performances

�Chronometry : +/- 50 cm at 1000 m►Environment conditions :

�Medium calibre 25x137 : 100 000 g 1000rd/s

Mk I

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►Architecture

Electronics and SAU designs are deeply fit into each other during engineering process.

Setback generator

Airburst card

Firing card

SAU

Mk I

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Recorded flight tests

►Accumulated energy is generated by setback accelerati on

►Chronometric accuracy assessment

►Detonator firing sequence

ΓΓΓΓ ≈≈≈≈ 60 000g et 100 000g

Electronic functions

Recording unit

Mk I

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EMC immunity assessment Measures from 2 GHz to 18 GHz

ampli

1,50m emitter

receptor

Spectral analyser

Induced voltage within the round coil is deduced by analysis from measures achieved thanks to vectorized spectral analyser

Mk I

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EMR hazards immunityMeasures from 60 MHz to 18 GHz

ampli

emission

reception

Networks analyser

ampli

emissionshell

STEP 1 : measure of max. level without ammunition ST EP 2 : measure of max. level within ammunition

►Measures permits to assess the shell faradisation►Analysis permits to evaluate the existing safety margins against EMR aggressions

Mk I

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Demonstration NEXTER Munitions French MOD – September 08

Mk I

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• Conclusion

►The maturity levels have grown quickly till today

►This growth is partially due to the new experimental techniques like in-flight data recorder at high level of acceleration

►2009 – 2010 will be the time for the demonstrations t ests !

6Electronics 25 mm airburst fuze

Current

TRLMain Techniques or

Technologies InvolvedSub-systems or Components

2006 2007 2008 2009 2010

Concept design Design and fuze validation Demonstration trials

1 2 3 4 5 6 TRL

Fuze technology – MATURITY LEVELS

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1. Design & Demonstration of 25mm Airburst ammunition- Mk II

Self-funded study

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Synthesis

•Merge both programs (airburst and µSAU)

•µSAU advantages

►MEMS technology particularly adapted to Medium calibe r ammunition: size & number of ammunition to produce

►Cheaper: electronics industry

►More reliable

►Robust

►Settable for the complete range of medium caliber

Mk II

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Self funded-study

•µSAU design based on NMu pyro-MEMS experience

•Study of safety locks reacting straighthly to the arming environments

•MEMS SAU designed for electrical ou mechanical detonators

•Workflow

► Simulation, static and dynamic tests on each device s (setback & rotation safety lock, motion of the shutter

► Simulation, static and dynamic tests for the comple te MEMS SAU

Down selectionDown selection

Mk II

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Time schedule

TRL6

Mk II

2008 2009 2010

SAU MEMS DESIGN

MEMS production and evaluation iterations

MEMS production and evaluation iterations

Safety locks study

Complete SAU study

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Work in progress

►MEMS SAU design done (patended)

► First batch of MEMS produced

► First batch of MEMS tested

� Structure able to withstand 100.000g

� Safety locks operate

Mk II

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Thanks to your attention