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Abstract The CATANA project aims to promote the development of the next generation of Ultra-High-Bypass-Ratio Turbofan engines by closing the knowledge gaps concerning multi-physical interactions which affect performance and limit the stability range. It involves a composite-material fan stage, called ECL5, representative of near future UHBR architectures. It has been designed at Ecole Centrale de Lyon to provide an open for the community benchmark configuration. This fan had been extensively tested previously at the aerodynamic Phare-2 test facility (rotating machinery platform for environmental risk control) in different running conditions at the LMFA laboratory (Ecole Centrale de Lyon fluid mechanics and acoustics laboratory) concerning synchronous and asynchronous responses (NSV). It is tested here under vacuum, in rotating conditions in the Phare-1 facility in order to identify structural modal parameters, ie mainly the whole fan blade assembly structural damping. Each blade is equipped with piezoelectric actuators to excite structural modes. Blades’ vibratory responses are measured via embedded strain gauges. The instrumented fan blades are firstly individually tested on a specific test hub mounting. Piezoelectric actuators efficiency is demonstrated by reaching representative amplitudes. Also, individual blades frequencies dispersion is quantified and shows in particular that the added exciters have negligible influence on mistuning and dynamics. The fan response is measured using the same instrumentation as for aerodynamic experiments and at the same rotational speed. Influence of rotating speed and vibration level on modal damping is shown and quantified.
Billon et al. (Mon,) studied this question.
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