Integrated Noise Model Accuracy for General Aviation Aircraft (2014) / Chapter Skim
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5 Detailed Analysis -- Measured versus Modeled Discrepancies Departures 5.1 For all jet aircraft types evaluated, Table 5 presents the measured and modeled departure SEL values, the discrepancies due to the difference between measured and modeled SEL, the decibel effect of altitude differences and the resultant discrepancy if the altitude could be corrected.21 Figure 1 and Figure 2 present the measured and modeled SEL values and the altitude corrected discrepancy, respectively. The measured minus modeled discrepancy is the metric of how well the INM as normally used for modeling differs from the measured reality for that aircraft.
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Table 5 Departure discrepancies computed for all aircraft types Order Designator Measured SEL (dB) Modeled SEL (dB)
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Figure 1 Measured and modeled departure SEL values for the evaluated aircraft Figure 2 Altitude corrected departure discrepancies for the evaluated aircraft 27
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Arrivals 5.2 For all aircraft types evaluated, Table 6 presents the measured and modeled arrival SEL values, the discrepancies including the difference between measured and modeled SEL, the decibel effect of altitude differences and the resultant discrepancy if the altitude could be corrected. Figure 3 and Figure 4 graphically present the measured and modeled SEL values and the altitude corrected discrepancy, respectively.
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Figure 3 Measured and modeled arrival SEL values for the evaluated aircraft Figure 4 Altitude corrected arrival discrepancies for the evaluated aircraft 29
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Observations 5.3 The INM modeling for almost all aircraft types computes departure SEL values higher than the measured levels (measured minus computed discrepancies are almost all less than zero, Table 5)
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