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۱CERTIFICATION BY ANALYSIS FOR AIRCRAFT SEATS UNDER CFR PARTS 23 AND 25 CATEGORIES
نویسنده(ها): ،
اطلاعات انتشار: پانزدهمین کنفرانس سالانه مهندسی مکانیک، سال
تعداد صفحات: ۸
This paper addresses the experimental, mathematical modeling, using MADYMO (Mathematical Dynamic Model) software, and hybrid dynamic modeling of aircraft seat cushions for different deceleration pulses which are representing for various aircraft categories. Occupant lumbar load under CFR Part 23 and 25 is being obtained by using different methodologies including running full scale sled tests, employing quasi–static
testing to measure material properties and using them in MADYMO and hybrid dynamic models. A crashworthy structure is designed such that in the event of crash, it absorbs impact energy in a controlled manner. All energy absorption materials such as honeycombs, polyurethane foams, polymer foams, metallic foams and so on are being used to make a safe and survivable trip for passengers and even sensitive instruments, equipments and computers in packaging applications. The main subsystems of an aircraft involved in crashworthiness are seat cushion, which is part of seat structure, restraints, fuselage and landing gear. Polyurethane foams are being used as acoustic purposes, as padding in the finished interior panels of the aircraft, and seat cushions. Their main application is mostly in seating purposes to provide comfort for occupant. Due to the fact that there is a direct interaction between the occupant body and the seat cushion, it has to be ergonomically comfortable as well as providing safety for passengers on board. All the seat cushions have to pass Federal Aviation Administration (FAA) Regulations before being installed on the seats. These regulations require a dynamic sled test of the entire seat system for certifying the seat cushions. This traditional dynamic testing is also required for replacing the deteriorated cushions with new buildup cushions which is time consuming and costly.<\div>

۲Aircraft Seat Cushion Dynamic Behavior at Extreme Ranges of Temperatures
نویسنده(ها): ،
اطلاعات انتشار: شانزدهمین کنفرانس سالانه مهندسی مکانیک، سال
تعداد صفحات: ۵
Aircraft seat cushions are exposed to varying temperature ranges during their lifetime. This paper addresses the experimental results conducted by quasi–static tests on a visco–elastic cushion, developed by industries, at extreme ranges of temperatures and to determine the variations in their dynamic characteristics. All tests are conducted at the National Institute for Aviation Research (NIAR) at Wichita State University (WSU). The seat cushions are tested at different temperatures to determine their characteristics and to predict their dynamic behavior. The prediction is based on the similarity of the load versus deflection curves from the quasi–static tests. Substitute cushions having similar dynamic characteristics at room temperature, as the visco–elastic cushion at extreme temperature ranges, are identified. From the various tests conducted with the seat cushion at a range of temperatures, it has been observed that at elevated temperature, there is very little effect on the dynamic behavior of the visco–elastic cushion. While at lower temperature, the cushion becomes more brittle and consequently affects the dynamic response of the cushion.<\div>
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