Active Control of Sound (ACS) has been a promising method for noise control (Active Noise Control, ANC) and also for other applications such as active absorption and active increase of sound transmission loss of partitions. VTT has developed a new method to manufacture thin, flat and efficient acoustic sensors and actuators utilizing ElectroMechanical Film (EMFiT) technology. Sensors and actuators can be easily implemented in ACS applications, where large surfaces should be covered with sensors or anti-sound producing elements.EMFi panel sensors and actuators are thin elements, which can be collocated forming an advanced sensor-actuator combination. Using sensors and actuators together with advanced amplifiers and JMC-method based control systems it is possible to create totally new approach for the active control of sound. Two larger European Union funded research projects, led by VTT, and several smaller ones, are focusing on the use of EMFi panel elements in ANC systems. The principles and some results of the use of EMFi-technology in active noise control are presented in this paper. Main application areas are the traditional ventilation noise control in ducts and the sound transmission loss increase of panels for the noise reduction in buildings and in transportation systems (to reduce noise entering the cabin of cars and trains).
|Title of host publication||INTER-NOISE and NOISE-CON Congress and Conference Proceedings, Active99|
|Publisher||Institute of Noise Control Engineering|
|Number of pages||12|
|Publication status||Published - 1999|
|MoE publication type||B3 Non-refereed article in conference proceedings|
|Event||International Symposium on Active Control of Sound and Vibration, ACTIVE 99 - Fort Lauderdale, United States|
Duration: 4 Dec 1999 → 6 Dec 1999
|Conference||International Symposium on Active Control of Sound and Vibration, ACTIVE 99|
|Period||4/12/99 → 6/12/99|
Nykänen, H., Antila, M., Kataja, J., Lekkala, J., & Uosukainen, S. (1999). Active control of sound based on utilizing EMFI-technology. In INTER-NOISE and NOISE-CON Congress and Conference Proceedings, Active99 (pp. 1159-1170). Institute of Noise Control Engineering.