Accession Number : AD1050927


Title :   The Philosophy, Theoretical Bases, and Implementation of the AHAAH Model for Evaluation of Hazard from Exposure to Intense Sounds


Descriptive Note : Technical Report,01 Jan 2016,01 Mar 2017


Corporate Author : US Army Research Laboratory Aberdeen Proving Ground United States


Personal Author(s) : Price, G R ; Kalb,Joel T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1050927.pdf


Report Date : 01 Apr 2018


Pagination or Media Count : 90


Abstract : The Army has adopted the Auditory Hazard Assessment Algorithm for Humans (AHAAH) as the method of assessing impulsive noise hazards in the MIL-STD 1474 Military Noise Standard (2015). AHAAH is a physiological-dynamics-based advance over nonphysical, wholly empirical, external energy-damage correlation methods for evaluating hearing damage risk associated with impulsive noise exposure. AHAAH applies the physical auditory dynamics of the external, middle, and inner ear, to biomechanically model the ears response to impulsive sound and determine the strain-induced damage occurring in the cochleas organ of Corti. AHAAHs physical dynamics includes observed nonlinear behavior in the middle ear. AHAAH is validated against the measured results of human exposures to impulsive sounds, and unlike wholly empirical correlation approaches, AHAAHs physical basis gives it improved applicability in estimating the auditory risk caused by impulses not previously considered. The Hearing Protection Module of AHAAH allows the evaluation of hearing damage risk for persons using hearing protection when exposed to impulsive noise. The module includes nonlinear hearing protectors as well as many linear protectors. Research and development supporting the creation of AHAAH are described, along with potential approaches for continued improvements in AHAAH and in the assessment of auditory hazards associated with impulsive noise exposure.


Descriptors :   ear , exposure (physiology) , noise , hearing loss , skull , situational awareness , organ of corti , measurement , hearing protection , algorithms , human factors engineering , hazards , risk analysis , damage , ELECTROACOUSTICS


Subject Categories : Anatomy and Physiology
      Human Factors Engineering & Man Machine System


Distribution Statement : APPROVED FOR PUBLIC RELEASE