Evaluation of the Biomechanical Responses During an Aircraft Emergency Landing
Tóm tắt
Passengers’ safety in unconventional situations, such as those of an emergency landing, has become more and more important due to the increase of air traffic. To improve passengers’ safety, certification authorities have imposed specific crashworthiness requirements in airworthiness regulations as defined in Title 14 of Federal Regulations Code—Part 25 for transport aircraft. Over the years, a series of drop tests were carried out to evaluate the structural performance of the airframe and seats and their effects on the occupants. However, the development of a single test is not only time-consuming but also very expensive. In this context, computer modelling and simulation have become increasingly popular for efficient and quick investigations on aircraft’s dynamic behaviour. This study aims to develop a numerical procedure to assess passengers’ safety during a crash landing and optimize the occupant lumbar load for which the impacts of different seat cushion foams are analysed. The experimental data have been collected as part of the research project, which involved the Department of Industrial Engineering Federico II on a drop test of a full-scale fuselage section equipped with two Anthropomorphic Test Devices (ATDs). The finite element model of the test article is generated through the pre/post-processor LS-PREPOST® and is solved using the non-linear explicit dynamic finite element code LS-DYNA®. The parametric study confirms the importance of choosing the appropriate foam material of the aeronautical seat cushion, as it has been observed that DAX 55 foams resulted in a lumbar load peak reduced by 20.6% with reference to the conventional polyurethane foam.
Tài liệu tham khảo
European Transport Safety Council: Increasing the Survival Rate in Aircraft Accidents. ETSC. https://etsc.eu/wp-content/uploads/1996_increasing_survival_rate_aircraft_accidents.pdf (1996)
Shanahan, D. F.: Basic Principles of Crashworthiness. RTO-EN-HFM-113, Pathological Aspects and Associated Biodynamics in Aircraft Accident Investigation, Madrid (2004)
Zimmermiann, R. E., Merritt, N. A.: Aircraft Crash Survival Design Guide. U.S. Army Aviation Systems Command (1989)
Federal Aviation Regulations: FAR 25.561 "General". Code of Federal Regulations. https://www.ecfr.gov/current/title-14/chapter-I/subchapter-C/part-25/subpart-C/subject-group-ECFRda24a9b1d389632/section-25.561
Federal Aviation Regulations: FAR 25.562 “Emergency landing dynamic conditions”. Code of Federal Regulations.https://www.ecfr.gov/current/title-14/chapter-I/subchapter-C/part-25/subpart-C/subject-group-ECFRda24a9b1d389632/section-25.561
Jackson, K. E., Fasanella, E. L.: A History of full-scale Aircraft and Rotorcraft Crash Testing and Simulation at NASA Langley Research Center. NASA Technical Reports Server (NTRS). https://ntrs.nasa.gov/citations/20040191337 (2006)
Livermore Software Technology Corporation: LS-DYNA Keyword User’s Manual Vol 1 (version 971). LS-DYNA Support. https://www.dynasupport.com/manuals/ls-dyna-manuals/ls-dyna-971/view (2007)
Kang, S., Chen, C., Guha, S. et al.: LS-DYNA® Belted Occupant Model. 15th International LS-DYNA® Users Conference. https://www.dynalook.com/conferences/15th-international-ls-dyna-conference/occupant-protection/ls-dyna-r-belted-occupant-model (2018)
Isheng Yeh: LSDYNA Seat Belt Modeling Guideline. Livermore Software Technology Corporation . https://ftp.lstc.com/anonymous/outgoing/support/FAQ_docs/SeatBeltGuideline1.pdf (2007)
Society of Automotive Engineers Inc: SAE J211/1: Instrumentation for Impact Test. SAE International (SAE) (1995)
Xue, P., Ding, M., Qiao, C. Yu, T.: Crashworthiness Study of a Civil Aircraft Fuselage. Latin American Journal of Solids and Structures. 11 (9) (2014). https://doi.org/10.1590/S1679-78252014000900007
Ren, Y., Xiang, J.: The crashworthiness of civil aircraft using different quadrangular tubes as cabin-floor struts. International Journal of Crashworthiness. 16, 253–262 (2011). https://doi.org/10.1080/13588265.2011.554204
Caputo, F., Lamanna, G., Perfetto, D., Chiariello, A., Di Caprio, F., Di Palma, L.: Experimental and numerical crashworthiness study of a full-scale composite fuselage section. AIAA J. 59(1), 1–19 (2020)
Abramowitz, A., Smith, T.G. Vu, T., Zvanya, J.: Vertical Drop Test of an ATR 42-300 Airplane. Federal Aviation Administration William J. Hughes Technical Center (2006)
Bhonge, P.: A methodology for aircraft seat certification by dynamic finite element analysis, Ph.D. Wichita State University (2008)
Adams, A., Lankarani HM.: Aircraft Seat Cushion Performance Evaluation and Replacement. American Society for Engineering Education (2003)