Numerical Investigation of a Mistuned Academic Bladed Disk Dynamics With Blade/Casing Contact

Abstract This contribution focuses on the combined analysis of mistuning and unilateral blade-tip/casing contacts. A two-dimensional (2D) phenomenological finite element (FE) model an aircraft engine fan stage is considered. It reduced by means Craig–Bampton component mode synthesis method contact treatment relies a Lagrange multiplier algorithm within explicit time-integration scheme. Blade-tip/casing contacts are initiated through deformed shape perfectly rigid casing. Mistuning accounted for blades only. Monte Carlo simulations carried out in both linear nonlinear configurations, which allows to compare amplifications predicted context due mistuning. Following thorough convergence proposed numerical strategy, influence level as well configuration external forcing investigated. Presented results underline detrimental consequences structural context, yielding even higher vibration than context. cross-analysis between computations reveals that no correlation found suggests effect existing strategies mitigate may not be suitable