Nonlinear Static Analysis of McDonnell Douglas MD90 Aircraft Using MSC/NASTRAN Superelement Database Author : H. T. Wu t, S. Q. Diep J, and V. K. Gupta

WHAT IS THIS DOCUMENT ABOUT? : The new McDonnell Douglas MD90 aircraft engine/pylon/fuselage interface reactions, pylon stresses, and deflections were determined using MSC/NASTRAN non-linear finite element analysis. The aft fuselage was modeled in detail using McDonnell Douglas interactive CGSA/CASD graphic software and reduced to a boundary stiffness matrix at the fuselage/pylon interface to minimize the cpu time in nonlinear iterations, design optimization, and evaluating multiple load conditions. MSC/NASTRAN was then used for SOL 66 nonlinear static analysis with the detailed engine model represented as one superelement, the pylon/fuselage model as another superelement, and the engine mount structures as residual structure. The engine mount structures were modeled by non-linear gap elements to evaluate the fail-safe design and by thermal elements to account for the preloads caused by engine expansion. The ultimate and fail-safe loading conditions were analyzed for emergency landing, arbitrary dynamic landing, arbitrary vertical gust, arbitrary lateral gust, engine seizure, reverse thrust rollback, take-off run, towing, and taxiing conditions. Fatigue design loads were generated from take-off to landing for one operation cycle. Engine fan blade-out analysis was also performed for the engine mount loads. Deflections of the engine/pylon/fuselage structure were generated to help designers investigate structural clearances for both ultimate and fail-safe design conditions

Keywords	:	nonlinear McDonnell Douglas MD90 Aircraft MSC NASTRAN Superelement Database
file credit	:	H. T. Wu t, S. Q. Diep J, and V. K. Gupta
file type	:	pdf
file topic	:	Engineering
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file address	:	www.mscsoftware.com/support/library/conf/wuc91/p03891.pdf

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