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- W1997751598 abstract "Underground noise levels of diesel engines were projected from above-ground measurements to set noise reduction goals meeting mine safety standards. Projection schemes applying to large spaces do not apply to most underground spaces which are tunnels (length ≫ width, height) or flat rooms (spread ≫ height). The sound-pressure level in the reverberant region of a large space is fairly constant but decreases monotonically with distance from the source along the length of a tunnel or the spread of a flat room. A method resembling that of Yamamoto [J. Acoust. Sec. Jap. 17, 26 (1961)] was used to project underground SPL for different values and combinations of the wall absorption coefficients and for various distances of the source and observer from the walls. All engines were approximated by point sources, the boundaries were replaced by an equivalent set of images, and the contributions from all sources were added in an uncorrelated fashion. Direct measurements performed at several mines support this projection method. [This work was sponsored by the United States Bureau of Mines. ]" @default.
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- W1997751598 date "1975-04-01" @default.
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- W1997751598 title "Projection of diesel engine noise in mines from above‐ground measurements" @default.
- W1997751598 doi "https://doi.org/10.1121/1.1995257" @default.
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