This paper presents the results of experiments conducted to investigate infrasound generation in a bus. The bus was driven on a smooth road, both upwind and downwind, and with and without damping of window vibrations. It was also run on an uneven road for comparison. The results show that by damping the window vibrations it was possible to reduce the infrasound levels significantly. It is also concluded that higher air turbulence around the bus slightly increases the infrasound outside the frequency range of the axle resonance. Finally, it is concluded that road roughness as well as tyre “roughness” (unbalance or run-out) excite vibration and infrasound.
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References
1.
SandbergU.Combined Effect of Noise, Infrasound and Vibration on Driver Performance. Proceedings of Inter-Noise 83 in Edinburgh, pp 887–890 (Also reprint No. 86, Swedish Road and Traffic Research Institute).
2.
Arbetarskyddsstyrelsens kungörelse med föreskrifter om buller (requirements regarding noise). AFS 1986:15, The National Board of Occupational Safety and Health, Stockholm, 1986-08-20.
3.
SandbergU.: The Generation of Infrasound in Buses. Proceedings of Inter-Noise 81 in Amsterdam, pp 727–732. (Also reprint No. 65, Swedish Road and Traffic Research Institute).
