Abstract
Diesel electric locomotives in the US represent a significant source of environmental noise under a variety of operating conditions. There are two primary sources of noise on these locomotives that will have to be reduced before significant reductions can be achieved: exhaust noise and cooling fan noise. Here a system is proposed that uses both active and passive components to control broadband exhaust noise below 3 kHz. The active system utilizes eight actuators and eight residual microphones in a feedforward configuration to control tonal noise below 250 Hz. The passive system is a compact exhaust silencer designed to control exhaust noise above that frequency while still fitting within the limited space available beneath the locomotive hood. Performance estimates for both the active and passive system will be presented along with the results of field tests of a breadboard active system on an F59PHI locomotive. [Work was supported under contract to the Federal Railroad Administration.]
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