详情

原文传递 APPORTIONMENT OF HORN AND ENGINE COMPONENTS IN COMPOSITE TRAFFIC NOISE USING FREQUENCY ANALYSIS

题名：	APPORTIONMENT OF HORN AND ENGINE COMPONENTS IN COMPOSITE TRAFFIC NOISE USING FREQUENCY ANALYSIS
正文语种：	eng
作者：	DHEERAJ BHATT;A.B. GUPTA
作者单位：	DB Engg. Services Jaipur;Department of Civil Engg.MNIT Jaipur
摘要：	It was reported earlier that considerable difference existed in observed and predicted noise levels in Indian conditions using FHWA model, which led to the introduction of a correction factor for horn in its basic noise equation (Choudhary et al., 2003; Bhatt et al., 2008). For computing the contribution of engine and horn in composite ambient noise due to traffic, sound pressure levels for octave bands as well as Equivalent Sound Pressure level (Lat) were recorded under controlled vehicle operating conditions. Apportionment was carried out using dominant frequencies for the noise produced due to horn and engine operated independently. Idealized sound pressure distribution curves for the two components were developed and a composite curve was derived by the addition of the two, which was also verified through experimental observations. With only one vehicle operated at a time, the contribution of horn to the total noise was significantly higher than that of the engine as high frequencies get higher weighting factor in the dBA scale used for the measurement of ambient noise. For an actual situation under constricted flows on junctions where many engines and a few horns operate together, a method has been suggested to apportion the contribution of horn and engine separately by analyzing the sound pressure levels at the dominant frequencies for the individual components. The present paper describes the possible role of frequency analysis in source apportionment, which may find extensive applications in the management of ambient noise.
出版年：	2023
期刊名称：	Indian Highways
卷：	51
期：	3
页码：	24-28