ASA S12.75 2012

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ANSI/ASA S12.75-2012 American National Standard Methods for the Measurement of Noise Emissions from High Performance Military Jet Aircraft

Published By	Publication Date	Number of Pages
ASA	2012	64

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Description

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PDF Pages	PDF Title
13	1 Scope 2 Normative references
14	3 Terms and definitions
17	4 Noise measurement instrumentation requirements 4.1 Noise recording systems 4.2 Microphones and preamplifiers 4.3 Recorder general requirements
19	5 Measurement site 5.1 Terrain
20	5.2 Ground impedance 5.3 Weather requirements
23	6 Noise measurement methods 6.1 Field test general methods
24	6.2 Aircraft performance measurement methods
25	6.3 Conventional take-off and landing (CTOL) ground run-up methods
30	6.4 Short take-off/vertical landing (STOVL) / Vertical take-off/vertical landing (VTO/VL) ground run-up methods
31	6.5 CTOL flyover noise methods
36	6.6 Short take-off/short landing (STO/SL) flyover noise methods
38	6.7 Vertical take-off/vertical landing (VTO/VL) flyover noise methods
41	7 Data analysis 7.1 Weather analysis 7.2 Spectrum analysis
42	7.3 Corrected spectral time histories 7.4 Weighted overall levels 7.5 Uncorrected pressure time histories – pressure vs. time 7.6 Aircraft tracking data 7.7 Aircraft performance histories 8 Reporting and test documentation 8.1 Calibration records 8.2 Weather data 8.3 Test log / scribe notes
43	8.4 Instrumentation set-up log 8.5 Test location data 8.6 Ground impedance data 8.7 Aircraft performance data 8.8 Aircraft tracking data 8.9 Raw noise measurement data 8.10 Reduced noise data
46	Annex A (normative) Measurement uncertainty for ground run-up noise methods A.1 Measurement uncertainty
48	Annex B (normative) Measurement uncertainty for flyover noise methods B.1 Measurement uncertainty
50	Annex C (informative) Microphone cable length considerations
52	Annex D (informative) Conventional flight procedure communication protocols
54	Annex E (normative) Obstructions and reflections E.1 Obstructions E.2 Field reflections check
55	Annex F (informative) Spectral smearing with low-level flyovers F.1 Source angle smearing
57	Annex G (informative) Elevated microphones – direct vs. reflected waves
59	Annex H (informative) Weather analysis: Corrections for atmospheric absorption for flyover
60	Bibliography

Additional information

Standard Title	ANSI/ASA S12.75-2012 American National Standard Methods for the Measurement of Noise Emissions from High Performance Military Jet Aircraft
Published Code	ASA
Publication Date	2012
Pages Count	64

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ASA S12.75 2012

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