DRI THE DEVELOPMENT OF DITCHING and THE DEVELOPMENT OF DITCHING and WATER IMPACT DESIGN LIMITS WATER IMPACT DESIGN LIMITS PRESENTED AT INT’L CABIN SAFETY PRESENTED AT INT’L CABIN SAFETY CONFERENCE CONFERENCE NOVEMBER 17, 2004 NOVEMBER 17, 2004 LISBON, PORTUGAL LISBON, PORTUGAL DYNAMIC RESPONSE INC. (DRI) DYNAMIC RESPONSE INC. (DRI) FEDERAL AVIATION ADMINISTRATION FEDERAL AVIATION ADMINISTRATION (FAA-TC) (FAA-TC)
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THE DEVELOPMENT OF DITCHING and WATER IMPACT DESIGN LIMITS
THE DEVELOPMENT OF DITCHING and WATER IMPACT DESIGN LIMITS. PRESENTED AT INT’L CABIN SAFETY CONFERENCE NOVEMBER 17, 2004 LISBON, PORTUGAL DYNAMIC RESPONSE INC. (DRI) FEDERAL AVIATION ADMINISTRATION (FAA-TC). SBIR WATER IMPACT PROGRAM. PHASE I Feasibility of Hybrid and FEM Methodology - PowerPoint PPT Presentation
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DRITHE DEVELOPMENT OF DITCHING and THE DEVELOPMENT OF DITCHING and
WATER IMPACT DESIGN LIMITSWATER IMPACT DESIGN LIMITS
PRESENTED AT INT’L CABIN SAFETY PRESENTED AT INT’L CABIN SAFETY CONFERENCECONFERENCE
NOVEMBER 17, 2004NOVEMBER 17, 2004
LISBON, PORTUGALLISBON, PORTUGAL
DYNAMIC RESPONSE INC. (DRI)DYNAMIC RESPONSE INC. (DRI)FEDERAL AVIATION ADMINISTRATIONFEDERAL AVIATION ADMINISTRATION(FAA-TC)(FAA-TC)
DRISBIR WATER IMPACT PROGRAM
PHASE I• Feasibility of Hybrid and FEM Methodology
PHASE II• Perform Full Scale Tests, Model and Correlate (KRASH and MSC/DYTRAN)• KRASH Model For Existing Scale Model Ditching test• Evaluate FAR27/29 Water/impact/Ditching Regulations & Compliance• Develop Preliminary Water impact Design Limits With KRASH
PHASE III• Develop Military and Civil Helicopter KRASH Models• Evaluate Correlation Techniques/Procedures• Develop Design Criteria & Design Envelopes (DLE) & Procedures- Using KRASH
--- Ditching and Water Impact--- Civil helicopters--- Military helicopters
• Recommend Ditching and Water Impact Design Criteria
DRI
IMPACT ENVELOPESIMPACT ENVELOPESFigure 3-1 Ditching and Survivable Crash Environment
0
5
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25
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0 10 20 30 40 50 60 70 80 90 100
longitudinal velocity - ft/sec
vert
ical
vel
ocity
- ft/
sec
U.S. Navy Helicopters, Land, 95th % SurvivableU.S. Navy Helicopters, Water, 95th % SurvivableU.S. Army Helicopters, 95th % Design RequirementCivil Rotorcraft, 95th % Land & Water Range - upperCivil Rotorcraft, 95th % Land & Water Range - lowerSBIR Test S1 - UH-1HSBIR Test S2 - UH-1HOsprey Ditching TestsFAA Civil Ditching RequirementsUH-1H Parametric Analysis Cases
DRI
SIGNIFICANT QUESTIONS
1. Can modeling simulate /represent the significant aspects of full-scale impact and scale model ditching tests?
2. Can analytical modeling be an effective tool in the development of crash design criteria?
DRIASPECTS OF WATER IMPACT ASPECTS OF WATER IMPACT
1.06 inch surface penetration 8.5 inch head travel
Lap Belt Restraint Only
DRIAPPLICABILITY TO FAR 25;
TRANSPORT CATEGORY AIRCRAFT
FAR 25, FAR 27 and FAR 29 HAVEMANY SIMILARITIES:• Ditching Envelope• Seat Dynamic Test Requirements• Mass Item Retention• Acceptance Criteria• Compliance Procedures
- F/S WI and Scaled Ditching Tests- Civil and Military Rotorcraft Models/Correlation- FAR 27/29 and Military Design Specifications/Compliance
• Development of Ditching Criteria and Design Limit Envelopes Based On;- Occupant –Seat-Restraint System Integrity- Structural and Mass Retention Integrity- In Excess of 300 Simulations Performed
• Applicability of DLE to Evaluate Design Strength, Operational Conditions, Acceptance Criteria, New Designs, FAR 25, 27, 29
• End Product Goal- Recommended Ditching and WI Design Criteria, DLE and Procedures
DRI
The Fourth Triennial The Fourth Triennial International Aircraft Fire and Cabin Safety International Aircraft Fire and Cabin Safety Research ConferenceResearch Conference