Frequency spectrum and noise level in the human ear durin cycling- a simulation in the wind tunnel

Introduction Cycling leads to different noise levels occurring in the human ear depending on speed. The aim of this study was to simulate thefrequency spectrum and its change at three different levels of velocity in a wind tunnel. In addition, the influence of a bicycle helmet on sound pressure levels and its possible meaning for the cyclist was examined.

Methods The series of measurements was carried out in a wind tunnel (type Göttingen) on an artificial head with integrated microphones with and without a bicycle helmet. The sound pressure was measured at three different speedlevels (25/40/60 km/h) for the left and right ear. Background noise was recorded with a reference microphone in the windless area outside the wind tunnel. The RMS values were determined and the speed-dependent frequency spectrum recorded graphically.

Results The frequency spectrum expandsvisibly and the measured RMS values of the sound pressure level increase depending on the speed. The frequency spectrum at 60 km/h reaches from 0-21.000 Hz, the RMS value here is > 105 dB on the left ear. The use of a bicycle helmet indicates a reduction of the measured effective values of the sound pressure level.

Conclusion When riding a bicycle, especially at high speeds, significant sound pressure levels are applied to the ear, which can sometimes affect safety on the road. To what extent industrially produced aids reduce the noise load adequately, should be the subject of further investigations. Furthermore, the collection of psychoacoustic parameters could clarify the significance for subjective evaluation in the recipient.

Poster-PDF A-1487.PDF

Publication History

Article published online:
10 June 2020