A hybrid modelling technique is presented that uses test data measured on an industrial test bench to characterize the acoustic behaviour of a helicopter’s gearbox in operating conditions.
The proposed approach uses inverse technique to compute the gearbox surface velocities leading to the identification of hot spots on the gearbox surface and paving the way to noise source localization. Direct boundary element techniques are then used to propagate back the pressures and compute the gearbox acoustic power for different operating conditions.
