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2011-10-18
Technical Paper
2011-01-2623
Serhiy Bozhko, Tao Yang, Greg Asher, Patrick Wheeler
This paper summarizes recent activities undertaken in the University of Nottingham towards development of simulation tools for accelerated simulation studies of complex aircraft electric power systems. The more-electric aircraft (MEA) is a major trend in aircraft electric power system (EPS) engineering that results in a significantly increased number of power electronic driven loads onboard. Development and assessment of EPS architectures, ensuring system integrity, stability and quality performance under normal and abnormal scenarios requires extensive simulation activity. Increased power electronics can make the simulation of a total EPS impractical due to large computation time or even numerical non-convergence due to the model complexity. Hence there is a demand for accurate but time-efficient modeling techniques for MEA EPS simulations.
2000-11-01
Technical Paper
2000-01-SC23
John McMaster
Twenty-three Post Mortem Human Surrogate (PMHS) limbs were impacted using a test set up that was developed to simulate the loading conditions seen in a frontal collision. Articulation studies were performed on each limb prior to impact. Failure occurred at impact loads of 5.7+/-1.9 kN (resultant tibial failure load 6.4+/-1.9 kN) and the following injuries were generated: 9 intra-articular calcaneal fractures; 1 talar neck and 2 talar body fracture; 3 intra-articular distal tibial (pilon) fractures; 2 malleolar fractures; 3 soft tissue injuries and 3 had no detectable injury. The impact test conditions were replicated with a Hybrid III leg in a first attempt at developing injury risk functions for the dummy. This study has demonstrated the significance of pre-load through muscle tension and the intrinsic properties of PMHS specimens in the generation of severe ankle and hindfoot injury.
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