United States Department of Transportation
i
Integrated Noise Model (INM) version 6.0 technical manual
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2002-01-31
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[PDF-703.68 KB]
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Abstract:The Federal Aviation Administration, Office of Environment and Energy (FAA, AEE-100) has
developed Version 6.0 of the Integrated Noise Model (INM) with support from the John A. Volpe
National Transportation Systems Center, Acoustics Facility (Volpe Center) for development of the
acoustic computation module, and from the ATAC Corporation for systems integration, development
of the graphical interface, and methods for computing aircraft flight profiles and constructing
flight paths, which are processed by the acoustics module.
This Technical Manual describes the core technical components in INM 6.0, including the flightpath
methodology (Chapter 2), along with the basic methodology employed by the INM to compute
noise levels or time-above metrics at a single, user-specified observer, or at an evenly-spaced,
regular grid of observers (Chapter 3).
The noise/time computation methodology includes a description of: (1) computation of the flightsegment
geometric and physical parameters; (2) flight-segment noise-level interpolation process;
(3) atmospheric absorption adjustment; (4) acoustic impedance adjustment; (5) flight-segment
noise-fraction adjustment for exposure-based metrics; (6) aircraft speed adjustment for
exposure-based metrics; (7) lateral attenuation adjustment; (8) ground-based directivity
adjustment for observers behind start-of-takeoff-roll, as well as for computing metrics
associated with run-up operations; (9) metric computation process; and (10) development of a
recursively-subdivided irregular grid methodology, which is used for computing noise contours
(Chapter 4).
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