USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Site Notification

Site Notification

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Advanced Acoustic Model (AAM) Software

About AAM

The Advanced Acoustic Model (AAM) is a suite of software tools that allows users to model vehicle sound levels at receiver positions, either on a uniform grid or at specific defined locations, from helicopters, tiltrotor vehicles, and fixed wing aircraft.

AAM is flexible in its ability to allow users to model noise from any traditional or evolving transportation noise source. 

A variety of noise metrics are calculated by the model. Acoustic properties of the noise sources are defined by sets of sound spheres, each sphere being centered on a noise source of the aircraft, or as a single compact source at the center. Sets of sound spheres may include one-third octave band (broadband) levels, or via narrow band, 1/12 octave band or as pure tone sound pressure levels and phase. Noise contours on the ground may be output graphically or in tabular format. 

Results are in a form suitable for inclusion in environmental documents or for computing other conditions such as human audibility in the presence of background sound.

Last updated: Thursday, August 5, 2021