A one-parameter model (xi) for stop-and-go-noise is developed. The physics of the phenomenon is based on the idea of the linear density of radiated energy. The methodology of xi determination has been worked out and illustrated. The noise interaction with the surface of the ground is considered to be the only wave phenomenon that disturbs geometrical spreading. The model makes possible the calculation of the correction term in the time-average sound level, LAT, as an adjustment to the constant speed model of traffic noise with LAT=approximate value of LAT+Delta LAT. The approximate value of LAT has to be adjusted. The correction term Delta LAT contains the percentage of the cruising vehicles and the difference of sound exposure levels (which accounts for the stop-and-go noise of a single vehicle). Because the scarcity of data regarding the process of noise generation during the stop-and-go motion, the following simplified assumptions are made: S(x), which is a function of the vehicle's location x, varies linearly with x during the deceleration and acceleration (i.e., dynamics of acceleration is quantified by the parameter of acceleration xi). The results indicate that the acceleration of automobiles within a town area (from V=0 km/h to V=55 km/h) can be characterized by xi=1.3. Larger values of xi are expected for trucks. Measurements of LAT of noise coming from interrupted automobile traffic have already been done.
Interrupted traffic noise
Intermittierender Verkehrslärm
Journal of the Acoustical Society of America ; 101 , 1 ; 360-371
1997
12 Seiten, 18 Bilder, 12 Quellen
Article (Journal)
English
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