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原文传递 Effects of Bird Orientation at Impact on Load Profile and Damage Level.

题名：	Effects of Bird Orientation at Impact on Load Profile and Damage Level.
作者：	West,Blaine S.;Challita,Antonios;
关键词：	DAMAGE ASSESSMENT, BIRD STRIKES, PITCH(MOTION), YAW, LOADS(FORCES), CRACKS, ORIENTATION(DIRECTION), PRESSURE MEASUREMENT, IMPACT SHOCK, MODEL TESTS, POLYCARBONATES, AIRCRAFT PANELS, TRANSVERSE, PERFORATION, END ON ORIENTATION, TRANSPARENT PANELS.
摘要：	This report describes an experimental study which was conducted to investigate the effects of bird orientation at impact and to identify the worst-case impact. 450 g substitute birds were launched with three different orientations onto 0.635 cm thick polycarbonate panels at four different locations. The minimum perforation velocity was used as the main criterion to measure damage; however, perforation wasn't achieved at the center of the panel and at the lower, or up-stream, corner. Therefore, another measure of damage was adopted for these locations; length of cracks, depth of pocket, etc. The end-on, or axial, orientation was found to be the most damaging orientation. Substitute birds were also launched with the two transverse orientations onto a rigid target plate at three obliquity angles, 90 degrees, 45 degrees, and 25 degrees. Impact pressures were measured, and analyzed. Pressure profiles showed shock pressure only. No steady-state pressures were observed. Shock pressures were compared to theoretical Hugoniot curves and good agreements were obtained. (Author)
总页数：	85
报告类型：	科技报告