by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English
|Statement||Marcus F. Heidmann|
|Series||NASA technical memorandum -- X-71763|
|Contributions||United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, Lewis Research Center|
|The Physical Object|
|Pagination||66 p. :|
|Number of Pages||66|
viii small engine revision; fan noise prediction test case (9 pages) ix small engine revision user's manual and anopp code development (15 pages) x interim prediction method for fan and compressor source noise, m. f. heidmann, lewis research center (select figures only) and aircraft noise prediction programFile Size: 4MB. Fan noise 7/12/ FAN NOISE PREDICTION The sound power produced by centrifugal and axial fans can be approximated by a simple equation (ref. ASHRAE Handbook) LW = KW + 10 log10 Q + 20 log10 P +BFI +CN where: LW= sound power level (dB) KW = specific sound power level depending on the type of fan (see Fig ), from.  Stone J. R., “ Interim Prediction Method for Jet Noise,” NASA TM-X, Google Scholar  Guérin S. and Michel U., “ Aero-Engine Noise Investigated from Flight Tests,” 12th AIAA/CEAS Aeroacoustics Conference, AIAA Paper , May Google ScholarCited by: 7. Development and application of a new procedure for fan noise prediction By A. Moreau and A. Guerin Topics: TriebwerksakustikCited by: 8.
source mechanisms. Following LOWSON  one can classify noise prediction methods into three groups: ² Class I: Predictions giving an estimate of overall level as a simple algebraic function of basic machine parameters ² Class II: Predictions based on separate consideration of the various mechanisms causing fan noise, using selected fan File Size: KB. The Application of Advanced Analysis Methods to the Reduction of Noise from Air Compressors O. Johnson The need to reduce compressor noise is driven by two forces the market demands and legislation. cost for noise prediction work is achieved using finite time andAuthor: O. Johnson, A. V. Smith, C. E. Winslett, T. Morel. fan noise, with the majority related to axial fans. In this paper, two noise models are modified for broadband fan noise prediction; the analytical model of Amiet  for airfoil turbulent interaction noise and the semi-empirical axial fan noise model of Carolus et al. . The models are compared with experimental noise data obtained from a. AUTOMOBILE NOISE AND VIBRATION-SOURCES, PREDICTION, AND CONTROL The motivation for reducing traffic noise is that it is the most important environmental noise source in India and in fan is the main source of noise. It is used in addition to radiator for cooling, and operated by air File Size: KB.
Interim prediction method for fan and compressor source noise. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], OPTIMIZATION AND ANALYSIS OF AERODYNAMIC CHARACTERISTICS AND NOISE SOURCE IN A CENTRIFUGAL COMPRESSOR WITH VANED DIFFUSER Huabing WEN1, Jingjing SANG2, Qidong ZHONG3, Hongdan LIU4 In this paper the turbulence dynamics and the noise source of a centrifugal turbocharger compressor were analyzed using Computational Fluid Dynamics (CFD) techniques. Interim Prediction Method for Fan and () by M F Heidmann Venue: The design tool is based on a new application integration framework incorporating a detailed noise prediction code, engine simulator, and aircraft analysis and optimization modules. This paper describes the framework and design approach, including initial results that. Vol. III, Supplement 1—Prediction Methods,” FAA RD, III-I, March Google Scholar  Heidmann M. F., “ Interim Prediction Method for Fan and Compressor Source Noise,” NASA TMX, Google Scholar  Krejsa E. A. and Stone J. R., “ Enhanced Fan Noise Modeling for Turbofan Engines,” NASA CR, Cited by: 5.