CH-53K Heavy Lift Helicopter A Survivability Focused Design Presented at the American Helicopter Society 67 th Annual Forum Virginia Beach, VA May 3-5, 2011 This is a work of the U.S. Government and is not subject to copyright protection in the U.S. Kathy Russell kathy.russell@na vy.mil Vulnerability Analyst NAVAIR China Lake, California Martin Krammer [email protected]Vulnerability Test Engineer NAVAIR China Lake, California Richard Gardner richard.gardner@nav y.mil Survivability Lead NAVAIR Patuxent River, Maryland Nicholas Gerstner nick.gerstner@survice .com Survivability Analyst SURVICE Engineering Dayton, Ohio
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CH-53K Heavy Lift Helicopter A Survivability Focused Design Presented at the American Helicopter Society 67 th Annual Forum Virginia Beach, VA May 3-5,
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CH-53K Heavy Lift Helicopter
A Survivability Focused Design
Presented at the American Helicopter Society 67th Annual Forum Virginia Beach, VA
May 3-5, 2011
This is a work of the U.S. Government and is not subject to copyright protection in the U.S.
•Susceptibility - the inability of an aircraft to avoid being hitSusceptibility Reduction - missile warning and missile jamming or decoying further enhance the survivability capabilities of the platform
•Vulnerability - the inability of an aircraft to sustain damage once hitVulnerability Reduction – threat tolerant design
Susceptibility and Vulnerability Reduction Verification• Analysis • Flight Test • Live Fire Test
Susceptibility Reduction
Threat Avoidance
Susceptibility reduction for the CH-53K consists of an integrated Aircraft Survivability Equipment (ASE) suite
Radar Warning Receiver AN/APR-39B(V)2 (RWR)/Electronic Warfare Management System Directional Infrared Countermeasures System (DIRCM) AN/AAQ-24(V)
Missile Warning System (MWS) *update – Laser Detection incorporated with MWS Countermeasure Dispenser System (CMDS) AN/ALE-47
Analysis and Flight Test will assess the ASE system effectiveness against AVS threats
SusceptibilityVerification
Susceptibility Analysis•Incorporates threat systems•Aircraft performance data•Various models and simulations
– Moderate Transmittance (MODTRAN)– Modeling System for Advanced Investigation of
•Challenging yet achievable Air Vehicle Specification (AVS)•Continuous Survivability Analyses•Early Ballistic Tests•Early involvement and a coordinated survivability team
Vulnerability Reduction
VulnerabilityVerification
Analysis and Test
MODEL TEST
VulnerabilityVerification
Vulnerability Analysis – Critical Data Sets
Geometry Conversion Techniques• SAC CATIA to BRL-CAD format• Streamlines the modeling effort • Ensures precise and accurate component representation
Traditional Data Sets• DMEA• Pd/h and Pk/d• FALT
VulnerabilityVerification
Vulnerability Analysis – Critical Data Sets
Low and Slow(L&S)
High and Fast(H&F)
0 40 80 Vmax
Helicopter Speed (kts)
0
100
Amax
Alt
itu
de
AG
L (
ft)
Low and Slow(L&S)
High and Fast(H&F)
0 40 80 Vmax
Helicopter Speed (kts)
0
100
Amax
Alt
itu
de
AG
L (
ft)
Traditional Flight RegimesDiscrete Mission Points• Define specific flight conditions
• Correlate to susceptibility analyses
Mission Points
Design ImpactInitial Assessment – Not compliant
Assessment Updates• Updated preliminary designs
• Integrated CH-53E JLF results
Design Enhancements• MGB redundant lube system
• Supplemental fuel feed system
• Main rotor actuator redesign
• Tail rotor drive shaft growth
Risk Reduction Testing• Identified components for testing to refine design and analysis
• Tail rotor drive shaft and Flexbeam successfully tested