Measuring Tire-Pavement Noise at the Source (2009) / Chapter Skim
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The simplest way to compare the CPX and OBSI measurements to the passby data is to consider the C H A P T E R 3 Evaluation of Alternative Test Methods
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cross-plots of overall A-weighted level and metrics generated by these plots. A typical cross-plot is shown in Figure 5 for CPX versus passby for all pavements and test speeds.
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Thus, the CPX levels over-predict the effect of porosity on the passby levels while the OBSI levels under predict it. This is likely due to the CPX sound pressure measurements being more affected by pavement sound absorption than the sound intensity measurement.
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From page 10... ...
presented in Appendix B)
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