New Options in Frequency Domain Analysis and Fatigue Analysis with LS-DYNA

A series of frequency domain analysis and fatigue analysis features have been implemented to LS-DYNA, since version 971 R6 [1]. The frequency domain features include FRF (Frequency Response Function), SSD (Steady State Dynamics), random vibration, response spectrum analysis, and acoustic analysis based on BEM (Boundary Element Method) and FEM (Finite Element Method). The fatigue analysis features include fatigue damage solvers in both time domain and frequency domain (based on random vibration and steady state vibration). The main applications of these features are in NVH and durability analysis of structures and components [2]. A bunch of new options were implemented to the frequency domain analysis and fatigue analysis features since the last European LS-DYNA Conference in Salzburg, Germany, 2017.