Abstract
Control transducers used for the active control of sound radiated from vibrating structures are usually either loudspeakers or shakers placed directly on the structures. For the control of structural sound radiation, shakers have an important advantage over loudspeakers because the control force rearranges directly and effectively the velocity distribution of the structure. However, there are some cases in which the structural vibration source is characterized as constant volume velocity or the physical characteristics of the structure prohibit direct contact with the shaker. This paper is directed at overcoming this difficulty. The control forces are applied to a perforated panel or enclosing shell, which is mounted a small distance away from the vibrating structure. The feasibility and mechanism of this control technique is investigated at low frequencies.
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