Research Methods for Understanding Aircraft Noise Annoyances and Sleep Disturbance (2014) / Chapter Skim
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6 Noise Metrics The day-night annual average sound level, DNL, as computed with the FAA's Integrated Noise Model (INM) will be the independent "noise dose" variable.
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Figure 5 Departure and Arrival Time Histories compared with Motility (body movement) of Sleeping Subject Time above a threshold (TA)
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Figure 6 A-weighted Time History of Recorded Overhead Departure Figure 7 Time Histories of a Single Jet Takeoff as Recorded ~ 3200 Feet Adjacent the Runway Boeing 737 Departure Directly Overhead 30 40 50 60 70 80 90 0 30 60 90 120 Seconds A -W ei gh te d So un d Le ve l, dB 30 40 60 80 90 0 10 20 30 40 50 60 70 80 90 100 A-level Time (Seconds) C-level Linear 20 Hz OB 18 70 50 S ou nd L ev el (d B )
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The following three sections provide graphics that demonstrate the inter-relationships of some of these metrics. They were developed primarily to verify the reasonableness of the INM computed values and to establish a process for efficiently generating the metrics for the national survey airports.
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Figure 9 Time Above Different Threshold Levels versus DNL 6.3 Probability of Awakening versus Lnight Figure 10 shows that the probability of awakening is quite correlated with Lnight, but differently at different locations. This differing relationship is because the probability of awakening is highly dependent on the number of night time aircraft noise events.
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