The aviation sector is at a pivotal point, facing the need to develop environmentally sustainable and efficient engines while remaining lightweight. A critical factor to consider during the design phase is the dynamic response of the engine, which, given its construction from millions of components, presents challenges in correlating experimental friction data with computational models. This Master Thesis aims to overcome some of these challenges by using wave propagation to improve the understanding of friction. Specifically, a numerical model in MATLAB that simulates the propagation of solitary waves in granular crystals, incorporating frictional effects, is developed. Like traditional ultrasonic waves, solitary waves are used as tools for non-destructive evaluation.