G. Pinte, Active control of reptitive impact noise, 2007

Abstract

Noise pollution from modern industrial activities is an environmental problem of growing importance. Especially in machine halls with production machines such as punching machines and presses, which generate repetitive transient noise, the radiated noise levels and the subsequent immission levels exceed often the legal regulations regarding human exposure to noise. The dissertation discusses the potential of active control techniques for the reduction of transient noise. Although there is a signicant dierence in nature between stationary and transient noise, up till now almost no particular research on the active control of transient noise is performed. The presented research aims at the development of specic optimisation strategies to nd suitable control congurations as well as the design and implementation of dedicated control algorithms in the case of repetitive transient noise. In this framework, iterative learning control algorithms, which are very ecient for the reduction of repetitive transient noise disturbances, are introduced in the eld of active noise control.

The developed concepts are applied in the design of active noise control (ANC) as well as active structural acoustic control (ASAC) systems. A practical validation is carried out on two industrial test cases. First, the developed algorithms are tested on an active silencer, which is used for the control of exhaust noise of an internal combustion engine. Secondly, an active structural acoustic control system is implemented on a punching machine to reduce the radiated impact noise.

Order Code

Code: 07D9