Contents: 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001
Acoustic analytical solution of rotating compact sources in frequency domain
language: English
received 05.05.2011, published 01.09.2011
Download article (PDF, 276 kb, ZIP), use browser command "Save Target As..."
To read this document you need Adobe Acrobat © Reader software, which is simple to use and available at no cost. Use version 4.0 or higher. You can download software from Adobe site (http://www.adobe.com/).
ABSTRACT
The paper describes a frequency-domain numerical predicting method for sound radiation of rotating compact sound sources. The analytical Green functions of rotating monopole and dipole sources in free space are presented. Sound radiation models are established and characteristics of sound field are studied by numerical simulation. The relationship between radiated sound frequencies and acoustic nature frequency of source, angular frequency and its harmonics can be revealed by the mathematical solution. Results show that radiated sound field has a strong directivity, fundamental frequency transmitting in the rotary shaft direction and harmonics spreading along radial direction and frequency shift phenomena appearing clearly in higher rotating speed of source. The method has theoretical significance for exploring the low-noise rotating machinery.
Keywords: rotating compact sound source, sound radiation, analytical Green function, numerical simulation.
11 pages, 10 figures
Сitation: Liu Zhihong, Yi Chuijie. Acoustic analytical solution of rotating compact sources in frequency domain. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2011, 8.
REFERENCES
1. M. J. Lighthill. On sound generated aerodynamically. I. General Theroy. Proc. R. Soc. Lond., 1952, 211A, 1107, 564–587..
2. J. E. Ffowcs Williams, D. L. Hawkings. Sound generation by turbulence and surface in arbitrary motion. Phil. Trans. Roy. Soc. of London, 1969, 264A, 321–342.
3. D. L. Hawkinqs. Noise Generation by Transonic Open Rotors. Westland Research Paper 599. 1979.
4. P. M. Morse, K. U. Ingard. Theoretical Acoustics. McGraw-Hill, New York, 1968.
5. M. V. Lowson. The sound field for singularities in motion. Proceeding of the Royal Society in London, Series A, 1965, 286, 559–572.
6. K. D. Ih, D. J. Lee. Development of the direct boundary element method for thin bodies with general boundary conditions. Journal of Sound and Vibration, 1997, 202, 361–373.
7. W. H. Jeon, D. J. Lee. An analysis of the flow and aerodynamic acoustic sources of a centrifugal impeller. Journal of Sound and Vibration, 2000, 222, 505–511.
8. W. H. Jeon, D. J. Lee. An analysis of generation and radiation of sound for a centrifugal fan. 7-th International Congress on Sound and Vibration, 2000, 121(3), 1235–1242.
9. W. H. Jeon, D. J. Lee. Anumerical study on the flow and sound fields of centrifugal impeller located near a wedge. Journal of Sound and Vibration, 2003, 266, 785–804.
10. H. L. Choi, D. J. Lee. Development of the numerical method for calculating sound radiation from a rotating dipole source in an opened thin duct. Journal of Sound and Vibration, 2006, 295, 739–752.
no photo |
Liu Zhihong is a teacher at Mechanical engineering department of Qingdao Technological University (China). Scientific area - vibration and noise control. e-mail: lzhqingdao(at)163.com |
|
no photo |
Yi Chuijie is a professor at Mechanical engineering department of Qingdao Technological University (China). Scientific area - vibration and noise control. e-mail:chuijieyi(at)163.com |