An investigation in crashworthiness evaluation of aircraft seat cushions at extreme ranges of temperature

다국어 초록 (Multilingual Abstract)

This paper obtains a Mathematical Dynamic Model (MADYMO) for occupant lumbar load evaluation under CFR Part 23 and 25 at extreme ranges of temperature. The validation of results is performed by full scale sled test results. Aircraft industries are using viscoelastic polyurethane foams as seat cushion. Visco-elastic foams bring not only more comfort to the passengers in long term sitting but it also maintains more safety during unpredicted crashes and hard landings. Aircraft seat cushions are exposed to varying temperature ranges during their life time. This fact has motivated aircraft industries to evaluate the seat cushion dynamic behavior at extreme ranges of temperatures in addition to what is mentioned in Federal Aviation Administration (FAA) Regulations at room temperature. This research provides a methodology based on simulation and modeling to eliminate, or at least, minimize the number of full scale dynamic sled tests defined by regulations for aircraft seats at extreme ranges of temperature.

참고문헌 (Reference)

1 "Standard Test Methods for Flexible Cellular Materials-Slab"

2 H. Beheshti, "Mathematical and Hybrid Dynamic Modeling for Sled Crash Testing on Aircraft Seats under CFR Parts 23 and 25 Categories" 2007

3 "MADYMO Theory Manual version 6.1"

4 Ch. Perry, "Evaluation of Proposed Seat Cushion to Vertical Impact" 30 : 197-207, 2002

5 Parks, "Defining Human Reaction to Whole-Body Vibration" 4 (4): 1962

6 W. Chen, "Crashworthiness Optimization of Ultralight Metal Structures" Massachusetts Institute ofTechnology 2001

7 W. Auyer, "A Study of the Dynamic Response of a Damped, Multi-degree of Freedom, Spring-Mass System Which Simulate a Seat, Seat Cushion, and Seat Occupant Subjected to a Vertical Impact Acceleration" Arizona State University 1969

8 H. K. Beheshti, "A Simplified Test /methodology for Crashworthiness Evaluation of AircraftSeat Cushions" 11 (11): 27-35, 2006