风力发电机组噪声抑制系统的设计研究

摘要

风力发电机组运转噪音由多种声源造成 ,主要包括机械结构运转噪声、辅助设备运转噪声和声源噪声。机械结构运转噪声包括齿轮箱传动机构动转噪声、轴承旋转噪声和电机旋转噪声等 ,辅助设备运转噪声包含散热器、通风扇等设备工作时的噪声 ,声源噪声则是由叶片转动时与空气接触产生的噪声。本论文设计的噪声抑制系统分为被动隔噪和主动降噪两个部分。通过机舱外壳隔音棉的设计和风向标的风向信号控制偏航电机工作 , 带动机舱进行迎风角度的调整 ,使得离居民区较近的风力发电机组在夜间工作时叶片旋转速度得以控制 ,减少机械振动和空气噪音。Abstract: The? noise? of? Wind? Turbines? is? caused? by? a? variety? of? sound? sources,? mainly? including?the?running?noise?of?mechanical?structures,?the?running?noise?of?auxiliary?equipment?and?the?noise?of?sound?sources.The?operating?noise?of?the?mechanical?structure?includes?the?rotating?noise?of?the?gearbox? transmission? mechanism,? the? rotating? noise? of? the? bearing,? and? the? rotating? noise? of? the?motor.The?operating?noise?of?auxiliary?equipment?includes?the?noise?of?radiators,?ventilation?fans?and?other?equipment.The?sound?source?noise?is?caused?by?the?contact?between?the?blade?and?the?air?when?it?rotates.The?noise?suppression?system?designed?in?this?paper?is?divided?into?two?parts:?Passive?noise?isolation?and?Active?noise?reduction.Through?the?design?of?sound?insulation?cotton?for?nacelle?and?yaw?control?of?Wind?Turbine,??the?rotation?speed?of?the?blades?of?wind?turbines?close?to?residential?areas?can?be?controlled?at?night,?thereby?reducing?mechanical?vibration?and?air?noise.