Use of a beat effect for the automatic positioning of flow obstructions to control tonal fan noise: Theory and experiments

• Published in: Journal of sound and vibration Vol. 332; no. 19; pp. 4450 - 4460
• Main Authors: Gérard, A., Berry, A., Masson, P., Moreau, S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 16.09.2013
• Subjects: Angular position; Blades; Noise; Noise control; Noise generation; Obstructions; Optimization; Rotors

Tonal noise generated by axial fans at the Blade Passage Frequency and its harmonics is a source of discomfort for low-speed fans used in many cooling and ventilation applications. The noise control approach presented here is based on the interference between the unsteady aerodynamic blade loads res...