Enhanced Turbine Blade Vibration Analysis

This study explores nonlinear dynamics in turbine blades, emphasizing the intricate role of friction. By introducing a novel coupling effect in our experimental model, we analyze the interplay between tangential and normal friction forces, alongside lateral energy dissipation. Our approach surpasses conventional turbine blade contact models, offering a comprehensive understanding of their dynamic behaviour. Leveraging the multi-harmonic balance method, we derive a mathematical model to address inherent nonlinearities. The alternative frequency time-domain method accurately computes contact forces, while a continuation algorithm navigates complex equations. Our findings highlight a significant improvement when considering the coupling phenomenon, validated through numerical reproduction of established research outcomes. Experimental analysis further confirms the superiority of our coupling-enabled contact model in predicting resonance amplitude and frequency.