详情

原文传递 Development of Ditching and Water Impact Design Limit Curves for Civil Rotorcraft.

题名：	Development of Ditching and Water Impact Design Limit Curves for Civil Rotorcraft.
作者：	wittlin, g. gamon, m.
关键词：	ditching, water impacts, structural integrity levels, occupant protection
摘要：	This report describes the further development of Design Limit Envelopes (DLE) for rotorcraft. A Bell Helicopter (BH) 205 was used as a prototype rotorcraft configuration upon which KRASH models were developed and analyses were performed. Included in the KRASH analysis of ditching and severe, but survivable, water impacts are structural integrity levels and occupant protection considerations. The DLE defines the vertical velocity versus longitudinal velocity relationship for which acceptable structural and occupant protection are provided. Previously, two full-scale, fully instrumented water impact tests of a helicopter were performed. KRASH models were established and their results correlated with the test results. A correlation between test and analysis results was performed to validate the models and to develop an understanding of the significance of the test measurements, the analytical representation, and the differences between the two. Further confidence in the correlation procedures was established under a Federal Aviation Administration (FAA)-sponsored effort in which a comprehensive evaluation of various correlation techniques was performed. In addition, Title 14 Code of Federal Regulations Parts 27 and 29 requirements and compliance procedures were evaluated in a previous FAA-sponsored effort and shown to have limitations. Under this former effort, preliminary water impact DLEs were proposed based on UH-1H helicopter tests and analyses. Under this current effort, a set of KRASH BH-205 helicopter structural and occupant models were established based on available data. These models were used to perform analyses for various sets of survivable water impact conditions. / NOTE: Final rept. / Supplementary Notes: Sponsored by Federal Aviation Administration, Washington, DC. Aviation Research and Development. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0720；137p
报告类型：	科技报告