Analytical Modeling of Transport Aircraft Crash Scenarios to Obtain Floor Pulses.
Abstract
Transport aircraft crash scenarios were analyzed with Program KRASH. Aircraft floor pulses and seat occupant responses are presented. The study included 1) an evaluation of L1649 measured floor pulses during a six-degree slope impact test, (2) an assessment of mass and size effects on the peak responses, (3) analyses to determine responses to wide-body aircraft candidate crash scenarios, (4) an evalaution of FAA-CAMI passenger seat test results and, (5) an assessment of seat performance during potential crash environments. A procedure by which crash environment dynamic pulses can be related to equivalent step pulses and to static loads is demonstrated. Results of the study lead to the following conclusions: Longitudinal-only pulses can be represented by equivalent step inputs and/or static requirements. Equivalences for vertical-only and combined loading need to be determined. A prime occurrence of failure for seats subjected to lateral loads is at the seat leg attachment to the seat track. The L1649 crash test floor longitudinal pulse for the aft direction (forward inertia) is less than 9g static or an equivalent 5g step pulse. The larger widebody floor pulse magnitudes are expected to be lower than for the corresponding smaller narrow-body aircraft. A viable procedure to relate crash scenario floor pulses to standard laboratory test data using current state-of-the-art analysis and test procedures has been demonstrated. Recommendations are presented with regard to extending current analysis capability and performing additional tests to support and verify analytical methodology.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1983
- Accession Number
- ADA157405
Entities
People
- D. Lackey
- G. Wittlin
Organizations
- Lockheed Martin