[en] This paper proposes a mixed hardware and software solution to impose different controlled dynamic load patterns to a bladed disk using non-intrusive acoustic excitation. The test bench is coupled to an autonomous measurement system consisting of an infrared Laser Doppler Vibrometer (LDV) placed on a robotic arm. The development of the test bench is described from the definition of the requirements up to the calibration of the different components (acoustic excitation devices, power amplifiers, LDV positioning, etc.). The relation between the supplied voltage and the resulting pressure acting on the blade is also assessed. The main application of the developed test bench consists in the imposition of Standing or Traveling Waves Excitation in order to appropriate a given nodal diameter content and experimentally study the response to typical excitation pattern encountered when integrated on motor. Another application consists in the experimental mistuning measurement through modal analysis and the use of the Inverse Component Mode Mistuning method.
The present work is carried out in the framework of the Coopilot ”VIBE” project funded by Wallonia DG06 and FEDER under contract N°1910246. We would like to thank Safran Aero Boosters to make available a BLISK for the purpose of the feasibility demonstration. We would like to thank Tom Otte who has greatly contributed to this work during its master thesis completion.
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