Active noise control in motorcycle helmets: Feedback, Feedforward, LTI and LPV approaches

ROSA CASTAÑÉ; FERNANDO BIANCHI; RICARDO S. SÁNCHEZ PEÑA

Rosario, Argentina

Conferencia; XIII Reunión de Procesamiento de la Información y Control; 2009

RPIC

Recent Noise at Work Regulations in the EU (2003) have been established to prevent NoiseInduced Hearing Loss (NIHL). This imposes more demanding performance results as compared to traditional active noise control (ANC) inmotorcycle helmets. Usual solutions are presented in terms of linear time invariant (LTI) feedback (FB) controllers, which generally produce poor results. Here an experimental identification of the error microphone-speaker model is usedto design a linear parameter varying (LPV) feedback controller. The parameter which schedules the LPV controller is the air velocity, which can be measured in real-time. It was tested against a road test experiment and produced promising results. In order to further increase the noise attenuation, two improvements should be studied: the addition of a feedforward (FF) controlto implement an hybrid (FF/FB) solution and the best location of an external noise microphone (used as a FF signal). A discussion on both issues is presented at the end of this paper as an ongoing research issue, which could potentially provide the required attenuation expected from the EU Noise Regulations.