Active structural acoustic control of impact noise

Industrial machines like punching machines and presses can generate structure-borne impact noise, with noise levels exceeding the tresholds, imposed by legal regulations on noise emission. This paper presents an approach of non-collocated active structural acoustic control of transient noise, produced by a repetitive impact excitation. Although there is a significant difference in nature between periodic and transient noise, up till now no specific research on active control of transient noise was reported. The presented research focuses on the development of time-invariant and learning feedback control algorithms, dedicated for the control of structural transient noise. A first research approach is to reduce the impact noise, generated by repetitive hammer impacts on a plate, by applying control forces on the plate. The effectiveness of the controllers is tested in simulation on a model of the plate as well as experimentally on a real plate set-up. In the future, this approach will be validated on machine structures.