Technical Reports

A Hybrid Active/Passive Exhaust Noise Control (APECS) for Locomotives

  • 01
  • Dec
  • 2002
AUTHOR: Federal Railroad Administration; Paul J. Remington; Scott Knight; Doug Hanna; Craig Rowley
OFFICE: RPD
REPORT NUMBER: DOT/FRA/ORD-03/03
KEYWORDS: Locomotives, APECS, Active/Passive Exhaust Noise Control System
ABSTRACT: This report documents the analysis and development of an Active/Passive Exhaust Noise Control System (APECS) for railroad passenger locomotives that could provide at least 10 dBA noise reduction. Based on preliminary analyses and tests on actual locomotives in 1995 and 1996, a combination active roof-mounted system and a passive exhaust silencer were designed. The roof-mounted system and a passive exhaust silencer were designed. The roof mounted system consisted of ten enclosures, each with 2 12-inch speakers as actuators; 8 microphones mounted on the roof as control sensors, a cabinet containing the controller and other electronics; a passive exhaust silencer specially designed for this system; and other components. This design was installed and tested on a locomotive in 1999. The tests included measurements of noise reduction performance and an inspection for any physical degradation of the system.

####