Uncommon noise signatures in a wind tunnel
Keywords:Optimization, Speed, Temperature control, Vibrations (mechanical), Wind tunnels, Uncommon noise signatures, Wind tunnel testing
AbstractAn on-site investigation was undertaken to correct a resonant tone that was eventually traced to the main fan support structure. It was found that the trailing edge flow leaving the stator blades and impinging on the flat support vanes was the main cause of the tonal noise problem. The fan manufacturer was apprised of these findings and the support vanes were modified with additional ribs to change their natural frequencies. The intensity of the tonal noise reduced substantially and the control noise levels are within the allowable tolerance of 60 dBA at all speeds.
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