Commercial Space Operations Noise and Sonic Boom Modeling and Analysis (2018) / Chapter Skim
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4-1 CHAPTER 4. Model Validation Plan 4.1.
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4-2 conditions from a commercial space vehicle flight operation including vehicle type, flight trajectory, and atmospheric conditions. Launch platform configuration would also be included as an input consideration when this modeling capability has been fully developed in the rocket noise model, RUMBLE.
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4-3 variety of commercial space flight vehicles. Finally, to quantify and assess RUMBLE's accuracy, validation tests should be performed to compare the input-output transformations of RUMBLE to the noise measurement results from the actual tests.
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Measurem such as th A in Figure operation of microp range of should al collection track and far out the predicted ents should e rocket engi FIGUR n example of 4-2. In this e to the south.
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In micropho model val T rocket sho frequency the Nation associated operated r mile from requires m sensitivity recorders least 48,0 portable r M to the rock the above ne positions idation effort A-wei Maxim A-wei Unwei he data recor uld acquire d range of les al Instrumen with close emotely. Low the rocket, icrophones t microphone or noise mon 00 samples p ecorder that m icrophones s et as follow FI discussion, should yield should be de ghted and Un um A-weigh ghted Sound ghted 1/3-oct ding system( ata at a rate s than 10 Hz ts PXI chass in microphon sensitivity where levels hat have a fr s include th itors used at er second an eets these re hould be mo s.
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4-6 rocket. Free field microphones should be oriented (pointed)
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4-7 Because rocket noise and sonic boom typically do not occur at the same ground location, this should be factored into the data collection effort. Although it is possible to measure the noise exposure and sonic boom exposure from the same flight operation, in two completely different geographic areas, it would require two separate measurement teams.
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sonic boo vehicle so FI A operation 0.3 psf (g (trajectory boom foo or individ validation focal regi also be in in the ce micropho regions w Hobbs, C validation micropho 0.1 psf c northern l large size PCBoom need to be m footprint a urce (F-funct GURE 4-3 L n example o is shown in F reen) , 0.5 ps shown as a tprint.
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FIG In all microp validation weighted T 51,200 sa to 20 kHz acquisitio operations L of sonic b micropho 20 kHz. respect to ground b response processing 4.4.3.
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4-10 The primary output of PCBoom should be used as the measure of performance. Direct comparison of the measured and modeled sonic boom metrics, at each measurement location, may be used to identify discrepancies in the model related to a particular boom metric or to a more fundamental element of the model, such as the propagation algorithm.
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