Accession Number : ADA262494


Title :   A Prediction Model for Noise from Low-Altitude Military Aircraft


Corporate Author : NATIONAL PHYSICAL LAB TEDDINGTON (UNITED KINGDOM)


Personal Author(s) : Berry, B F ; Speakman, J D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262494.pdf


Report Date : 13 Mar 1993


Pagination or Media Count : 7


Abstract : For a number of years, the National Physical Laboratory, supported by the Ministry of Defense, has been developing AIRNOISE, a mathematical model for computing aircraft noise contours. As part of the continuous programme of development of the model we were asked to extend it to include low-altitude military operations. The objective is to predict the complete time-history of the noise of these vary rapid events, thus providing information on onset rates as well as maximum levels. In order to provide high quality data with which to validate and refine the model, a special noise trial - Exercise Luce Belle - was conducted in which a number of aircraft types flew low, straight and level at various speeds and engine power settings. This paper firstly describes the noise trial and then the prediction models. The comparison of prediction with measurements is discussed. In particular the effects of changes in the assumptions in the model about lateral attenuation are explored.


Descriptors :   *MATHEMATICAL MODELS , *AIRCRAFT MODELS , *AIRCRAFT NOISE , MILITARY AIRCRAFT , PREDICTIONS , LOW ALTITUDE


Subject Categories : Military Aircraft Operations
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE