Abstract
The noise reduction effectiveness of wheel vibration absorbers was evaluated at the Bay Area Rapid Transit System (BART). The vibration absorbers were fitted to the steel tires of aluminum-centered wheels. Wayside noise was recorded at tangent and curved track with resilient direct fixation fasteners, and under-car noise data were recorded throughout the system. Data were collected with and without wheel vibration absorbers installed. The wheel vibration absorbers had little effect on wayside and under-car noise at audio frequencies, though a minor reduction of noise at about 500 Hz was observed, suggesting a change in wheel dynamics. Third octave band noise reductions are summarized for on-board and wayside measurements.
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