A new line for lightrail is developed in the centre of the Hague. This line is planned at a height of approx. 7 m above ground level. The design is a transparent steel construction like a fishnet stocking. Important concern was the sound radiation of such a steel structure that can be quite high. The SPL should be acceptable for the people near and under the railway. To assess the sound radiation an impedance model was made to calculate the vibration in the steel structure from a given source strength. The source strength was obtained form several measurements with different light rail trains and different tracks. It was found that for a sufficient reduction of sound radiation it was necessary to apply concrete beams as supports in combination with resiliently mounted rails. The expected equivalent sound pressure levels at ground level around the elevated rail are approx. 75 dB(A) during passage, which is expected to be sufficiently low to be acceptable for the shopping public.
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