A modeling approach is presented for simulating a full-scale crash test of the Sikorsky Advanced Composite Airframe Program (ACAP) helicopter using MSC/DYTRAN, an explicit nonlinear dynamic code. This research is performed under the US Army's Science and Technology Objective (STO) on Crash Modeling and Simulation with the goal of establishing a methodology for predicting the impact response of composite rotorcraft. The modeling approach involved conversion of an existing NASTRAN modal vibration model of the helicopter to a MSC/DYTRAN model. The strengths and weaknesses associated with this approach are discussed. The focus of the simulation effort has been on developing a detailed finite element model of the subfloor region of the ACAP helicopter using MSC/DYTRAN. The model is used to predict the crushing response of the subfloor when subjected to a vertical impact with 10 deg pitch and 10 deg roll onto a rigid surface. The subfloor simulation results are compared with experimental data acquired during the 1987 full-scale drop test of the Sikorsky ACAP helicopter at NASA Langley Research Center and with semi-empirical predictions.
Development of an ACAP helicopter finite element impact model
Simulation des Aufpralls eines Hubschraubers mit dem modifizierten NASTRAN-Programm zur Schwingungsanalyse mit der Finite-Elemente-Methode
Journal of the American Helicopter Society ; 45 , 2 ; 137-142
2000
6 Seiten, 9 Bilder, 11 Quellen
Aufsatz (Zeitschrift)
Englisch
Aufprall , Aufprallversuch , Hubschrauber , mathematisches Modell , mechanische Schwingung , Methodenvergleich , Modalanalyse , nichtlineares System , numerische Simulation , Simulationsprogramm , Stauchen , Stoß (Schlag) , Theorie-Experiment-Vergleich , Unterbodenstruktur , Verbundstoff , Zelle (Flugkörper) , Simulationsmodell
Development of an ACAP Helicopter Finite Element Impact Model
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