Modeling source and wayside sound levels as affected by pavement and bridge joint impulse noise

摘要

ABSTRACT Nearly all pavements contain discontinuities in the direction of travel that can generate impulse noise due to the unique tire-pavement interaction at these locations.The most common of these are joints,which can be periodic such as those associated with many concrete pavements or bridge decks,or isolated such as those that separate pavement and bridge structures. The most common measurements of highway noise today include source measurements(e.g., OBSI or CPX)and wayside measurements(e.g.,SPB or CPB).Sound levels measured using these two techniques will respond differently as impulse events are introduced into otherwise constant-level sources.These differences can be attributed to averaging methods,proximity of the measurement,and the number of impulse events generated by a given vehicle,among other factors.In this paper,a theoretical approach to this issue is explored.It will be demonstrated that level differences measured in close proximity to the source are not the same as those measured wayside.The differences are predictable though,and are a function of various physical parameters that describe the pavement,the vehicle,and the measurement.The results presented herein are intended to contribute to the goal of reducing impulse noise commonly associated with pavement and bridge joints.