To determine the horizontal directivity of a train pass-by
Paper i proceeding, 2003

Based on the assumption that railway noise can be modeled as a group/line of incoherent point sources a calculation scheme has been proposed for determining the horizontal directivity of train pass-by noise: with a certain directivity function(s) assigned to the individual point sources, the model will determine the effective horizontal directivity of the train pass-by noise. The sample calculations show that: (1) if all point sources are assigned monopole directivity the effective horizontal directivity of the train pass-by noise shall have the monopole pattern, for any measurement distance; (2) if all point sources are assigned the same directivity other than a monopole, the effective horizontal directivity of the train pass-by noise shall have the same directivity pattern when a measurement distance is not less than 3 times the train length, otherwise the effective directivity pattern of the train pass-by noise will vary with the distance; (3) the horizontal-directivity function used in some existing national models can be derived when some reasonable assumptions are applied.

horizontal directivity

railway noise

Författare

Xuetao Zhang

Chalmers, Institutionen för teknisk akustik

Proceedings of InterNoise 2003, Jeju, Korea, August 25-28, 2003

in03_627

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