Abstract
Diesel electric locomotives represent the primary source of motive power in the U.S. railroad industry, and are a significant source of environmental noise. There is a variety of noise sources on a locomotive; however, two sources will have to be controlled before significant reductions in locomotive noise can be achieved: diesel engine exhaust noise and cooling fan noise. Here a system is described that uses both active and passive components to control broadband exhaust noise below 4 kHz. The active system utilizes eight actuators and eight residual microphones in an adaptive feed-forward configuration to control tonal noise below 200 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. Both active and passive systems will be described in detail, and practical problems encountered in the design of the combined systems will be described. Performance estimates for both the active and passive system will be presented along with the available measurements. [This work was supported under contract to the U.S. Federal Railroad Administration.]
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