Minimum measurement time interval to estimate a reliable sound pressure level of road traffic noise using two types of dynamic statistics

作者：Maruyama Mitsunobu^*; Kuno Kazuhiro; Sone Toshio

来源：APPLIED ACOUSTICS, 2014, 83: 150-155.

DOI：10.1016/j.apacoust.2014.03.007

• Road traffic noise
• Maximum time-averaged and frequency-weighted sound pressure level L-AFmax
• Equivalent continuous A-weighted sound pressure level L-AeqT
• Measurement time interval T
• Mean time interval (t) over bar
• Mean recurrence time (Theta) over tilde

A new method to determine the minimum measurement time interval needed to obtain the equivalent continuous A-weighted sound pressure level with a designated reliability is presented. This method considers variations in the noise emission from passing vehicles. To verify the validity and availability, simulation experiments based on our dynamic model are examined under various traffic conditions. A statistic quantity, the mean time interval between two maximum sound pressure levels consecutively observed during the reference measurement time interval, is introduced in the experimental analysis. Additionally, the theoretical analysis includes another statistic quantity corresponding to the mean time interval, the mean recurrence time of the maximum sound pressure level, when the transition probability, rate of heavy vehicles, and probability distribution of vehicles passing the observation point during the reference measurement time interval are known.

• 出版日期2014-9