Improving AEDT Noise Modeling of Mixed Ground Surfaces (2017) / Chapter Skim
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4-1 CHAPTER 4. REVIEW OF GROUND EFFECTS IN CURRENT MODELS The primary noise sources around an airfield are the arriving and departing aircraft which generate noise both at ground level and at elevated altitudes.
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T The air-to FIGURE 5.
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FIGURE 7. Illustration of ground-to-groun d component of lateral attenuation.
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T originally (1964; 19 modified N according propagatio adjustmen T surfaces i AIR-5662 airplanes FIGU he ground-to developed a 65) , carried o in SAE-AIRoise propaga to aircraft t n over soft t to the noise he validation s shown in Fi 's lateral att with wing-mo RE 8.
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a FIGURE 9 (lower soli irplanes wit . Predicted S d line)
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G effects of FIGURE 10 (lower soli airplanes w eneral uncert noise propag Allaire, D Quantifica Engineerin Miller, N Hanson In Fleming, G Parks, Fed Lee, Cynth National P Volpe Nat Fleming, G Sound Lev Engineerin .
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4-8 TNM assumes a locally reacting surface to compute the plane wave reflection coefficient of the ground surface. The ground impedance is determined by using a frequency dependent, single parameter, ground type model such as described by Delaney and Bazley (1970)
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4.2.1. TN T figure abo included: kPa s/m2)
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4.2.2. TN T site a berm ground zo loose soil Figure 13.
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FIGURE 15 FIGU . Comparis RE 14.
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4.2.3. TN T highway a zone was in the Figu M Validat his site consi nd the park.
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4.2.4. TN T barrier.
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4.2.5. TN T impedanc can be se prediction the distrib ground ty median of mixed gro be seen th the majori F markers, there is n mixed gro deviations of the mi M Accurac he scatter pl e averaging m en more eas s as shown i utions of the pe, the box in the residual und type me at the majori ty of the resi igure 21 show many cannot ot a significa und types fr for the three xed ground y ots in the ab atch measur ily by consi n the next tw residuals, w dicates the ra s.
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ground ty it is reaso accuracy 4.3. Nor T (Plovsing road, rail sound pro frequency wind and moderate ground re zones", su In is based o pes, producin nable to con on par with si FI dic Noise G he Nordic No et al., 2001)
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number o model ha number o concept is for determ reflection Equation Nord2000 acoustical Attenboro interferen than are o T parameter Software obtain dif method. developer terrain.
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4-17 4.4. National Park Service: Noise Model Simulation (NMSim)
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N Figure 24 NMSim u It is noted Rasmusse FIGURE 2 oise measure . The model ses to compu in the Figu n's method c FIGURE 3.
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4-19 The study of all the events for both methods, KBR and BP, compared well with measurements. The comparison of the two methods versus measurements is shown in Table 4.
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4-20 TABLE 4 Statistical Summary of Sound Exposure Level Estimates and Measurements All All A All B 6 Nom.
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NMAP 7. of flight a is the com levels gen draw line environm both topog T Narvik (N considere shown as National A For this st on the air top of a 1 modeling calculatio dB)
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4-22 4.6. Department of Defense: Advanced Acoustic Model (AAM)
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4-23 Attenuation Method (SAM) that contains the Ray Tracing Program (RTP)
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4-24 4.8. Norwegian Aircraft Noise Calculation Model (NORTIM)
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4-25 effect for a particular one-third octave band level; whereas, EPD would have to be run for a series of frequencies within that one-third octave band.
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