Control of aircraft cabin noise has entered a new stage with lightweight systems that apply forces to the fuselage to reduce interior sound levels. Those that are effective at low frequencies interest aircraft designers the most. The process of using such forces, known as Active Structural Acoustic Control (ASAC), has shown much promise since the late 1980s. More recent ASAC work has concentrated on using surface-mounted piezoceramic actuators as the control forces. Some experiments already have used full-scale fuselages. Early research was promising, but the best configuration of the actuators remains an area of concentration.
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