Abstract:

Previous numerical work has indicated the potential advantages of minimizing the acoustic energy density for active control of sound in enclosures. Preliminary experimental results have generally confirmed this numerical work. A computerized scanning system has recently been implemented in an enclosure at Penn State Univ. University that provides greatly improved scanning capabilities to investigate the uncontrolled and controlled fields for active control experiments. Using this system, the active control of enclosed fields using energy density has been further investigated for both single-channel and multi-channel implementations. With the scanning capabilities, it is also possible to represent the experimentally measured field in terms of its modal components. Recent results that have been obtained will be presented, to show the control achieved using energy density, both in terms of the spatial dependence of the field, as well as in terms of its modal components.