Landing gear interwheel tonal noise characterization with the Boundary Element Method

摘要: Abstract Landing gear noise is mainly broadband in nature, but it can also feature some tonal contributions. Tonal significantly increases annoyance and originate from facing cavities landing wheels. The present work aims at using the Boundary Element Method (BEM) with a simple harmonic point source model to characterize resonance between two cylindrical wheels of generic nose LAGOON, where flow independence emission has been reported experimentally. Three configurations increasing complexity are successively considered: single wheel, linked by an axle, finally whole gear, including main strut. In terms resonant frequencies, BEM shown give results very good agreement analytical formulae CFD/CAA computations literature. Some acoustic measurements performed for LAGOON configuration observed experimental database. directivity modes detailed each case compared success results, except convective amplification effects. mode quantified through so-called scattering factor that much sharper resonances than cavity, presence strut only axisymmetric mode. Finally, modelisation interwheel space annular duct discussed parametric study conducted on axle diameter. this shed light domain validity while demonstrating ability treat geometries arbitrary low computational cost when models unavailable.