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Day 3 – NOVEMBER 8th 2012

Workshop 1 – Crashworthiness of Aircraft
Structures: Computational Methods to
Support Design and Certification

The workshop presented by leading international experts will give an overview of the current state of the art in design, analysis and test of crashworthy aircraft structures. It will present a methodology based on the test/simulation pyramid adopted for aircraft structures in which test and analysis methods for crashworthy structures are developed and validated at levels ranging from materials test specimens through structural elements up to full scale aircraft. The focus is on application of dynamic nonlinear explicit FE codes for metallic and composite materials at different structural levels. Special attention is given to advanced composite materials having high specific energy absorption where design rules are still under development.


8:00 Introduction to the Workshop –
Gerardo Olivares (NIAR)

8:10 Session 1:
Crashworthiness and Certification Requirements

FAA/EASA current and future requirements –
Joseph Pellettiere (FAA); Wim Doeland (EASA)

9:00 Session 2:
Experimental and Numerical Methods:
Crash Energy Absorption in Structural Elements

Speakers: Alastair Johnson (DLR); Juan Acosta, Suresh Raju
Keshavanarayana (NIAR/WSU); Mike Pereira, Amos Gilat (NASA)

• Experimental methods: material characterization
coupon to component level (NIAR)
• Advanced deformation and failure models for impact
in metals (NASA)
• Materials damage and delamination failure models
in composites (DLR)
• Validation of advanced models for structural elements (All)

10:45 Coffee and Tea Break

11:00 Session3:
Design and FE Simulation of EA
Composite Subfloor Structure

Speakers: Rodney Thomson (ACS-A); Matthew David (DLR)

• Design concept for EA helicopter frame in composites
• Fabrication and crash test of demonstrator structures
• FE simulation of crash tests to validate methodology

12:15 – 1:15 Lunch Break

1:15 Session 4:
Progress on Development of Full
Aircraft FE Crash Models

Speakers: Allan Abramowitz (FAA); Gerardo Olivares (NIAR)

• Full Scale Testing Programs Overview – Allan Abramowitz (FAA)
• Full-scale FE airframe models: State of the art and analytical
model limitations
• Enhanced FE models with cabin, seats, PAX, etc.
• FE models suitable for accident reconstruction

2:30 Coffee and Tea Break

2:45 Session 5:
Lessons Learned

• Airbus A380 Double Deck Simulation – Alan Melling (Airbus)
• Use of Non-Linear Analysis for Crashworthiness Certification –
Mostafa Rassaian (The Boeing Company)
• Composite Airframe Crashworthiness Research at NASA
Langley Research Center – Karen Jackson (NASA)

4:00 Session 6:
Open Forum Discussion

Gerardo Olivares (NIAR); Mostafa Rassaian (The Boeing Company)

• Q&A – Industry Panel

Day 4 – NOVEMBER 9th 2012

Workshop 2 – Aircraft Seat Dynamic Performance Standards: Testing and Analysis

This workshop will present the history and background behind the seat dynamic performance standards contained in Part 23/25/27/29.562. This will include the basis for the regulation, followed by a quick introduction to Anthropometric Test Devices, instrumentation and photometric analysis as contained in SAE J211. Attendees will also be exposed to a demonstration sled test detailing how a test is setup including dummy positioning. After the hands on portion, attendees will then lean how analysis can be included in the certification process by reviewing current recommended practice and guidance material with particular attention paid to model validation.


8:00 – 10:00 Session 1:
Aircraft Seat Dynamic Performance Standards– Joseph Pellettiere (FAA)
• History and basis for the regulation
• ATD and Injury criteria review
• Photometric review
• Instrumentation review
10:00 – 10:15 Coffee and Tea Break

10:15 – 12:00 Session 2:
Certification by Analysis –
Joseph Pellettiere (FAA);
Gerardo Olivares (NIAR)

• AC20-146
• CBA Seat Modelling Techniques

12:00 – 1:30 Lunch Break
1:30 – 5:00 Session 3:
Experimental and Analytical Methods
Test Demonstration at NIAR
Crash Dynamics Laboratory – Robert Huculak (NIAR)

• Part 25.562 test demonstration
• Review ATD positioning
• Pre and Post Test Data Collection Protocols
to Support CBA Activities
• Floor warping
• Review test results
Analytical Model Demonstration

• Example Analysis Sled Test –
Vikas Yadav, Nilesh Dole, Luis Gomez (NIAR)

• ATD Positioning
• Numerical Seat Model Definition
• Overview Component Level :
• Cushion
• Seat Belt Webbing
• Analysis
• Error Metrics Evaluation