In this study, the noise caused by light vehicles is examined on the basis of data measured for passing-by on 50 km/h limitation area. Measurements wer done and data processed in the way required by the so-called emitted reference value for the equivalent continuous sound pressure level in the Nordic road traffic noise model. According to preliminary measurements the emitted noise depends on vehicles speed so that the equivalent level = common constant . log(v) + vehicle constant. This result has been interpreted to show, that implicitely also the main data consists of noise-speed-curves with a similar shape differing only by their vehicle constant. So, the linear regression analysis of the main data has obvisously yielded a statistically 'proper' speed coefficient and a data fitted mean value for the vehicle constant (for the so-called emitted reference value for the equipment level). Comparison of the regression results with the reference value (68 dB) of the road traffic noise model shows that the result here (67.8 dB) is practically the same. On the other hand, the value of the speed coefficient 20.5 yielded by the measuring data differes considerably from the value 30 given in the road traffic noise model: the former means 6.0 dB rise of the equivalent level with speed doubled while the rise for the latter is 9.0 dB, respectively. It seems also, on the basis of the speed coefficient's value 22 of the preliminary measurements for speeds 30-60 km/h and the value 17 of the preceding study for speeds about 100 km/h, that the noise emission of vehicles grows a little slower than the logarithm of speed. The effect of different vehicle parameters on the emitted noise was examined, as well as the possiblilities to pick up especially noisy or silient vehicles or to found such a groups of vehicles. It was not found any technical characteristics of vehicles, that would be a notable factor in the noise emission. Neither was it found any statistical correlation between the noise emission and age of vehicle.


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    Titel :

    Kevyitten ajoneuvojen melun yksilöintzi


    Weitere Titelangaben:

    Studie über die Schallemission von Personenkraftwagen im Geschwindigkeitsbereich für geschlossene Ortschaften
    Study on the noise of light vehicles at low speeds


    Beteiligte:
    Sysiö, P. (Autor:in)

    Erschienen in:

    VTT Research Notes ; 1459 ; 3-1/3


    Erscheinungsdatum :

    1993


    Format / Umfang :

    26 Seiten, 4 Bilder, 9 Tabellen, 2 Quellen




    Medientyp :

    Report


    Format :

    Print


    Sprache :

    Finnisch