Industrial Fan Noise Control using Flow Obstructions

Fans are used in a lot of industrial processes and are sometimes a source of important noise for workers. We have focused on fans having a high tonal content, for which the Simple Silence technology can be applied, i.e. tonal fan noise control using obstructions in the flow. Evaporator fan noise control in a cold storage room, based on previous work on fan noise control in free field is first presented. Then, in-duct gold mine underground air-extractor fan noise control is presented, an original analytical model is derived for noise generation and propagation inside the duct, and preliminary experimental results are provided.