Non-contact Excitation and Measurement of Integrally Bladed Disk (BLISK) for Mistuning Identification

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Blade mistuning is a phenomenon encountered in assembled turbomachinery blade-disk systems as well as**one-piece bladed disks (called "blisks"). Mistuning is due to small variations of blade-to-blade geometries or**material properties and results into important vibration and fatigue issues in operating conditions. It is therefore**crucial that blisk mistuning be properly identified and controlled during the manufacturing process. Contrary to**assembled blade-disk systems, blisk mistuning must be identified from measurements of the entire bladed disk.**Our partner is looking for accurate, non-contact excitation and measurement techniques to identify mistuning**of their blisks.**The project will evaluate and test two non-contact candidate excitation techniques for mistuning identification:**magnetic and acoustic. Our partner will provide an existing prototype blisk instrumented with a ring of**electromagnets at close distance from each blade and ferromagnetic patches attached to each blade. The**alternative solution of using electrodynamic or parametric loudspeakers at close distance from the blades will**also be investigated over a limited sector of the blisk. Both modes of excitation will be simulated numerically**using the Finite Element method and tested experimentally on the prototype blisk.**A logical continuation of this work will address the design and implementation of a complete circumferential**array of nearfield loudspeakers to create traveling wave excitation and identify mistuning. The continuation**work would be conducted under a following CRD project.**Blisks are costly parts, and monitoring mistuning during the fabrication process is still an open problem. Our**partner is looking for innovative and efficient mistuning identification methods, that would ultimately improve**manufacturing accuracy and quality control of such crucial parts in turbomachines.