Abstract
In connection with the development of prototype close-proximity noise barriers for railroad and rapid transit applications, an acoustic modeling study was undertaken to determine the effectiveness of various barrier cross-sectional geometries and the effect of acoustical absorption. Barriers studied included flat vertical walls and various “Z” shape and “C” shape cross sections. The flat-top surface has been designed to allow these structures to be utilized as both a noise barrier and as safety walks for passenger emergency egress. The chief conclusions are that “C” and “Z” cross-sectional shapes are nearly equal in performance as noise barriers, and slightly better than an equivalently located flat vertical wall. It was also determined that track bed absorption (ballast) and barrier absorptive treatment appear to have significant effects in improving the performance of close-proximity rail transit noise barriers in reducing transmission of wheel/rail noise to wayside areas. [Studies supported by Fanwall, Inc., Framingham, MA.]
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