simulation of hydrodynamic ram of aircraft fuel tank by
TRANSCRIPT
Simulation of Hydrodynamic Ram ofAircraft Fuel Tank by Ballistic Penetrationand Detonation
Jong H. Kim, Senior Researcher, Agency for Defense Development (ADD)
Seung M. Jun, Principal Researcher/Team Lead, ADD
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ADD Overview - Organization
Board of Trustees
President
Executive Vice President
Auditor
Staff Directorate
Dual-use Technology CenterDefense S&T Academy
E-Information CenterJoint M&S Center
PEOs/PMOs
1st R&DInstitute
C4I
2nd R&DInstitute
ISR
3rd R&DInstitute
Neo Tech.& Energy
4th R&DInstitute
GroundSystems
5th R&DInstitute
NavalSystems
6th R&DInstitute
AircraftSystems
7th R&DInstitute
Test &Evaluation
DefenseSystemsCenter
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Contents
(*) Intermediate Complexity Wing
2. Intro. of Hydrodynamic Ram
3. HRam Sim. of Cubic Tank
5. HRam Sim. of Fighter Wing
4. HRam Sim. of ICW
6. Conclusion
1. Background
*
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1. Background - Survivability
Capability of an aircraft to avoid or withstand a man-made hostile
environment.
Susceptibility reduction – stealth, jamming, threat warning
Vulnerability reduction – redundancy, damage suppression, protection
Enhance Aircraft Affordability
(*) Robert E. Ball, “The Fundamentals of Aircraft Combat Survivability Analysis and Design”
Definition of Airframe Survivability*
Avoid or Withstand
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1. Background – Procedure
Analyze Battle Scenario
Estimate Threats
Show Survivability Req.
Perform Scaled-Down Live Fire Test
Test Criteria & Procedure
Develop Survivable Airframe
Survivability & RepairabilityConsideration
Conceptual Design
Simulate Battle Damage
EfficientDevelopment
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2. Intro. of HRam - Definition
• Damage process by the impact and penetration/detonation of a
ballistic projectile(shell) through the fluid(fuel) of a container(fuel tank).
• Internal fluid pressure by penetration or detonation causes from
perforation/petaling to complete destruction of a structure.
Perforation/Petaling(BlazeTech)
A-10 Wing Hit by MANPADSin Desert Storm (SURVIAC)
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2. Intro. of HRam - Purpose
• Plenty of aircraft losses are tied to fuel system vulnerability.
(75% of aircraft losses in Desert Storm were related to fuel/fire)
• HRam effect of fuel tanks is one of major threats in battle environment.
• Increasing terror from explosives is threatening commercial aircraft.
• Fuel tank of main wing is vulnerable as it has large exposed area.
• Analysis of complicated HRam physics enables the application to
many other battle damage
Apply to the Survivability Design of Aircraft
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2. Intro. of HRam – Basic Physics*
API** Case
HEI** Case
Shock Phase
Drag Phase
Cavity Phase
(*) Robert E. Ball
(**) HEI : High Energy Incendiary
API : Armor Piercing Incendiary
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3. HRam Sim. of Cube – Penetration
Simulate the damage and response of tank and fluid when a projectile
impacts and penetrates a cubic metal tank.
Half Model
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3. HRam Sim. of Cube – Skill
SolverSolution Method Nonlinear Explicit
SolutionTechnique
Multiple MaterialEulerian Solver
InitialCondi-
tion
Failure Criteria 70% Plastic Strain
Boundary Tank Bottom Fixed
Euler Multiple (Adaptive)Region Defined
Coup-ling
Projectile-Fluid General
Tank-Fluid General
Projectile-TankAdaptive Master-
SlaveContact
GeneralCoupling
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3. HRam Sim. of Cube – Procedure
Geometry
Modeling
Structure
FE Modeling
Prop., Failure
Criteria Input
Contact btw.
API-Tank
MSC. Patran
Fluid FE
Modeling, I.C.
Coupling btw.API-Fluid
-Tank
Result Display
& Interpretation
MSC. PatranCEI. Ensight
MSC. Dytran
MSC. Dytran(Manual Input Included)
Executive
Control & Run
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3. HRam Sim. of Cube – Result (1)
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024time
ps i
edge
corner
edge
corner
42 ksi
Tank Stress and Displacement
Time-Stress at Tank EntryPetaling
t=1.8 msec
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3. HRam Sim. of Cube – Result (2)
Animation Demo
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3. HRam Sim. of Cube – Result (3)
with Fluid without Fluid
½ t
Fluid Factor
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3. HRam Sim. of Cube – Detonation
Fluid Pressure
Tank Stress & Disp.
t=0.14 msec
t=0.85 msec
Animation Demo
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4. HRam Sim. of ICW – Detonation
AL2024-T3
JP-4 inside Wing Box
Simulate ICW tank rupture and fluid bursting by internal detonation under 6g
pull-up maneuver.
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4. HRam Sim. of ICW – Procedure
ICWGeometrical
Modeling
ICW
FE MeshProp. & Failure
Criteria Input
Fuel & HEI
Mesh, I.C.
MSC. Patran
Coupling btw.Tank-Fuel-Air-HEI
Result Display
& Interpretation
MSC. PatranCEI. Ensight
MSC. Dytran
ICW
AeroMesh
ICWAeroelasticity
Analysis
MSC. FlightLoads
MSC. Dytran
TransientLoad Input
Multi-Coupling Surfaces,Multi-EulerMaterials
Executive
Control & Run
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4. HRam Sim. of ICW – Skill & Result (1)
Multi-PorositiesAlgorithm
Flight Load Effect
Detonation Site
Tank Stress & Disp.
Fuel-Flowing(Drain)Hole Modeling
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4. HRam Sim. of ICW – Result (2)
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4. HRam Sim. of ICW – Result (2)
Animation Demo
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4. HRam Sim. of ICW – Result (3)
M&S ResearchLab. in ADD
3-D Simulation Available with V/R System
V/R Demo
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5. HRam Sim. of Fighter Wing – Penetration
Wing Layout
FE ModelDamage
Area
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5. HRam Sim. of Fighter Wing – Result
20mm Vulcan(0.1kg,
1.03km/s)JP-8
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5. HRam Sim. of Fighter Wing – Result
Animation Demo
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6. Conclusion – Achievement
• Model and simulate hydrodynamic ram, one of major threats to aircraft.
• Employ the latest FSI analysis skills to improve the reality of simulation
of battle damage of wing fuel tanks.
• Show feasibility of applying the simulation to the airframe design with
enhanced survivability in aircraft development.
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Success Story listed in http://www.mscsoftware.com
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Contact Details :
For further information please contact
Jong H. KimAgency for Defense Development
Yuseong P.O.Box 35-7,Daejeon,305-600,South Korea