ACOUSTIC VALIDATION OF A NEW CODE USING PARTICLE WAKE AERODYNAMICS AND GEOMETRICALLY-EXACT BEAM STRUCTURAL DYNAMICS

This paper describes the validation of a new code for predicting both aeroacoustic and aeroelastic behaviour of hingeless rotors. The structural component was based a non-linear beam element model considering small strains and finite rotations, which uses a mixed variational intrinsic formulation. The aerodynamic component was built on a loworder panel method incorporating a vortex particle free-wake model. The aerodynamic and structural components were combined to form a closely coupled aeroelastic code that solves in the timedomain. The loading and thickness noise terms for the aeroacoustic calculations were calculated from the aerodynamic data using a formulation based on the Ffowcs Williams-Hawkings (FW-H) equation. The code was successfully validated for acoustic signature and BVI predictions using test cases from the HELINOISE program.