NVH and Random Vibration Fatigue Analysis of a Landing Gears's Leg for an Un-Manned Aerial Vehicle Using LS-DYNA®

The present work concerns the new capability of LS-DYNA in solving Noise, Vibration and Harshness (NVH) and fatigue based on Power Spectrum Density (PSD) analysis. These new capability includes random vibration and high-cycle fatigue analysis in a random vibration environment. In this analysis, the cumultative damage ratio of a landing gear's leg for an Un-Manned Aerial Vehicle (UAV) is computed using material S-N (Stress-Number of cycles) fatigue curve. Dirlik method is used for the analysis of life time as it is proven to provide accurate results for large number of applications, both in automotive and aerospace industry. It is also compared to other methods that have been developed in LS-DYNA as well. The input acceleration PSD data are provided through measurements.