Abstract:The aft interior of the DC-9 aircraft is generally considered to be uncomfortably loud (100–110 dBC). This noise is primarily periodic and is caused by imbalances in the fan and turbine of the Pratt Whitney JT8D engine. Lord Corporation has recently developed active and adaptive passive systems to combat this problem. The active system uses four force-generating actuators located on the left and right engine pylons to minimize the response at eight control microphones which are located in the rear of the cabin… Show more
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