Full-scale crash test of the sikorsky advanced composite airframe program helicopter

摘要

The Sikorsky Advanced Composite Airframe Program (ACAP) flight test helicopter was crash tested on June 22, 1999, at NASA-Langley's Impact Dynamics Research Facility. The test conditions were 38 fps vertical and 32.5 fps horizontal impact velocities onto concrete whith 6.25 deg nose-up pitch and 3.5 deg left-down roll. The helicopter was instrumented with 62 accelerometers, 11 displacement transducers, 5 load cells, and 4 pressure transducers. Photographic data were collected with over 20 film and video cameras. Four 50~(th) percentile anthropomorphic manikins were used in the test. Two energy-absorbing crew seats were used in the cockpit and two energy-absorbing troop seats were used in the cabin. The US Army Aeromedical Research Laboratory provided the seats as well as the left front anthropormorphic manikin with a self-contained data acquisition system. Crash data were collected to validate a computer simulation of the full-scale crash test, developed using a nonlinear transient dynamic finite element code. The peak floor-level accelerations were approximately 85 g's vertically. The aircraft slid approximately 23 feet after ground contact and maintained livable cockpit and cabin volumes. The landing gear performed as designed with the nose gear stroking 9 inches and the left and right gears stroking, 13.2 and 11.8 inches, respectively. The pilot and copilot's seats reduced the vertical floor acceleration levels and stroked 9 and 14.5 inches, respectively. The maximum subfloor crush was about 1.5 inches. The fuel tank pressures were measured and the tank did not leak after the test.