Air Vehicle Technology Integration Program (AVTIP). Delivery Order 0086: Applied Nonlinear Low Order Response Prediction Methods Evaluation

摘要

The objective of this project was to evaluate the nonlinear reduced order modeling prediction method as applied to the acoustic fatigue design of representative fixed-wing aircraft structure and recommend technical improvements. These reduced order methods are applicable to the response of stiffened aircraft structural skins exposed to high aeroacoustic loading. The approach was to develop validation test cases based on actual aircraft structures under flight aeroacoustic loading environments. The Implicit Modal Condensation method was implemented with MSC/NASTRAN. The validation included the prediction of structural responses using full-order degree of freedom methods compared to the reduced order methods. Also, the structural response and predicted fatigue life was compared to available test data. This report documents the validation study of the new nonlinear reduced order structural response prediction method along with the identified benefits, deficiencies, and recommendations for technical improvement.