Active control of light-weight double panel partitions

Abstract

The possible sound insulation improvements of a double partition with the help of active noise control are investigated. The focus is laid on control around the fundamental resonance of a light-weight double panel partition. The behaviour of the partition is investigated by simulations of a modal based mathematical model. The simulation results are validated by measurements of the sound insulation properties, the cavity pressure and the panel vibrations of a plasterboard double wall. Different active control approaches are studied for the application and an adaptive feedforward controller is designed. The wall cavity pressure is chosen as the control measure. The controller is implemented and a maximum sound pressure level reduction of 7 dB is achieved in the recieving room.