Abstract
AbstractDue to standing waves the creation of artificial free‐field conditions is required to detect sound sources in weakly damped interiors. Normally sound absorbing material is mounted on the interior walls to eliminate unwanted reflections. In contrast to this time consuming procedure, the present paper describes a local approach that is based on a sound intensity probe with an active free‐field (SIAF). To study the dynamical behavior of a first SIAF‐prototype that consists of two electro‐dynamical loudspeakers mounted at the ends of a duct, an electro‐vibro‐acoustical model was implemented in Matlab/Simulink, and the dynamic behavior of the system was analyzed numerically. The results of these simulations proved that a one‐dimensional free‐field can be produced successfully, if a wave‐separation approach together with an adaptive LMS‐algorithm is applied. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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