Accession Number : ADA565391


Title :   Characteristics, Causes, and Evaluation of Helicopter Particulate Visual Obstruction


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Sullivan, Michael P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a565391.pdf


Report Date : 10 Sep 2012


Pagination or Media Count : 113


Abstract : A comprehensive approach to evaluation of rotorcraft brownout under degraded visual environmental conditions is presented. The results of a literature search covering the current state of brownout research are summarized. The brownout dust cloud generated by modern rotorcraft is analyzed and characterized using photographic and video data, coupled with examination of previous computer modeling techniques. A modeling analysis is performed in order to relate aircraft design and operating parameters to brownout dust cloud size is performed. The effect of vorticity in brownout dust cloud rollup is included. An augmented rating scale for pilot assessment is proposed for operational use, and the results are presented for designers and operators to approximate brownout performance of existing and future rotorcraft.


Descriptors :   *AERODYNAMIC CHARACTERISTICS , *BROWNOUTS(ELECTRIC POWER) , *HELICOPTERS , *ROTARY WING AIRCRAFT , COMPUTERIZED SIMULATION , DUST CLOUDS , PHOTOGRAPHY , VIDEO SIGNALS


Subject Categories : Aerodynamics
      Helicopters


Distribution Statement : APPROVED FOR PUBLIC RELEASE