• 0
    • ارسال درخواست
    • حذف همه
    • Industrial Standards
    • Defence Standards
  • درباره ما
  • درخواست موردی
  • فهرست استانداردها
    • Industrial Standards
    • Defence Standards
  • راهنما
  • Login
  • لیست خرید شما 0
    • ارسال درخواست
    • حذف همه
View Item 
  •   YSE
  • Defence Standards
  • NASA - National Aeronautics and Space Administration (NASA)
  • View Item
  •   YSE
  • Defence Standards
  • NASA - National Aeronautics and Space Administration (NASA)
  • View Item
  • All Fields
  • Title(or Doc Num)
  • Organization
  • Year
  • Subject
Advanced Search
JavaScript is disabled for your browser. Some features of this site may not work without it.

Archive

NASA-CR-181851

Evaluation of analysis techniques for low frequency interior noise and vibration of commercial aircraft

Organization:
NASA - National Aeronautics and Space Administration (NASA)
Year: 1989

Abstract: The application of selected analysis techniques to low frequency cabin noise associated with advanced propeller engine installations is evaluated. Three design analysis techniques were chosen for evaluation including finite element analysis, statistical energy analysis (SEA), and a power flow method using element of SEA (computer program Propeller Aircraft Interior Noise). An overview of the three procedures is provided. Data from tests of a 727 airplane (modified to accept a propeller engine) were used to compare with predictions. Comparisons of predicted and measured levels at the end of the first year's effort showed reasonable agreement leading to the conclusion that each technique had value for propeller engine noise predictions on large commercial transports. However, variations in agreement were large enough to remain cautious and to lead to recommendations for further work with each technique. Assessment of the second year's results leads to the conclusion that the selected techniques can accurately predict trends and can be useful to a designer, but that absolute level predictions remain unreliable due to complexity of the aircraft structure and low modal densities.
URI: http://yse.yabesh.ir/std/handle/yse/231698
Subject: AIRCRAFT NOISE
Collections :
  • NASA - National Aeronautics and Space Administration (NASA)
  • Download PDF : (1.624Mb)
  • Show Full MetaData Hide Full MetaData
  • Statistics

    NASA-CR-181851

Show full item record

contributor authorNASA - National Aeronautics and Space Administration (NASA)
date accessioned2017-09-04T18:50:17Z
date available2017-09-04T18:50:17Z
date copyright01/01/1989
date issued1989
identifier otherKUHOEEAAAAAAAAAA.pdf
identifier urihttp://yse.yabesh.ir/std/handle/yse/231698
description abstractThe application of selected analysis techniques to low frequency cabin noise associated with advanced propeller engine installations is evaluated. Three design analysis techniques were chosen for evaluation including finite element analysis, statistical energy analysis (SEA), and a power flow method using element of SEA (computer program Propeller Aircraft Interior Noise). An overview of the three procedures is provided. Data from tests of a 727 airplane (modified to accept a propeller engine) were used to compare with predictions. Comparisons of predicted and measured levels at the end of the first year's effort showed reasonable agreement leading to the conclusion that each technique had value for propeller engine noise predictions on large commercial transports. However, variations in agreement were large enough to remain cautious and to lead to recommendations for further work with each technique. Assessment of the second year's results leads to the conclusion that the selected techniques can accurately predict trends and can be useful to a designer, but that absolute level predictions remain unreliable due to complexity of the aircraft structure and low modal densities.
languageEnglish
titleNASA-CR-181851num
titleEvaluation of analysis techniques for low frequency interior noise and vibration of commercial aircraften
typestandard
page78
statusActive
treeNASA - National Aeronautics and Space Administration (NASA):;1989
contenttypefulltext
subject keywordsAIRCRAFT NOISE
subject keywordsCOMMERCIAL AIRCRAFT
subject keywordsENERGY METHODS
subject keywordsENGINE NOISE
subject keywordsFINITE ELEMENT METHOD
subject keywordsLOW FREQUENCIES
subject keywordsNOISE PREDICTION (AIRCRAFT)
subject keywordsPROPELLER NOISE
subject keywordsSTRUCTURAL VIBRATION
subject keywordsTRANSPORT AIRCRAFT
subject keywordsVIBRATIONAL SPECTRA
DSpace software copyright © 2017-2020  DuraSpace
نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
yabeshDSpacePersian
 
DSpace software copyright © 2017-2020  DuraSpace
نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
yabeshDSpacePersian