Acoustic Nearfield and Farfield for Vibrating Piston in Geometrical and Intensity Formulations

• Authors: M. Kozień
• Languages of publication: EN

Abstracts

EN

In classic acoustics there are two areas identified around acoustic sources - nearfield and farfield. The nearfield is connected with the Fresnel solution and farfield - the Fraunhofer one. For each regions there are different theoretical formulae for determination of distribution of the chosen acoustic parameter. Unfortunately there is no sharply outlined border between regions. Therefore one of the important problem, is to define approximately conditions for state the border between them. The two attempts for identification are discussed, i.e. geometrical one and intensity ones. The results are shown on the vibrating circular rigid piston case.

Keywords

EN

43.20.Bi; 43.20.Tb; 43.40.Rj

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 1A
• Pages: A-132-A-135

Dates

published

2012-01

Contributors

author

M. Kozień

• Institute of Applied Mechanics, Cracow University of Technology, al. Jana Pawła II 37, 31-864 Cracow, Poland

References

• [1] H.-E. De Bree, V.B. Svetovoy, R. Raangs, R. Visser, in: Proc. ICSV11, 2004
• [2] J. Cieślik, R. Panuszka, Arch. Acoust. 18, 197 (1993)
• [3] L. Cremer, M. Heckl, E. Ungar, Structure Borne Sound, Springer-Verlag, Berlin 1988
• [4] Z. Engel, Protection of Environment against Vibrations and Noise, PWN, Warszawa 2001 (in Polish)
• [5] M.S. Kozień, J. Theoret. Appl. Mech. 43, 119 (2005)
• [6] M.S. Kozień, J. Theoret. Appl. Mech. 47, 411 (2009)
• [7] M. Kwiek, Laboratory Acoustics. Part I: Basis Theoretical Acoustics, PWN, Warszawa 1968 (in Polish)
• [8] I. Malecki, Theory of Waves and Acoustic Systems, PWN, Warszawa 1964 (in Polish)
• [9] J.A. Mann, III, J. Tichy, A.J. Romano, J. Acoust. Soc. Am. 82, 17 (1987)
• [10] A. Śliwiński, Ultrasounds and their Applications, WNT, Warszawa 2001 (in Polish)
• [11] S. Weyna, Surface Distribution of Acoustic Intensity Vector in Small Limited Volume, Szczecin University of Technology, Szczecin 1993 (in Polish)
• [12] S. Weyna, Propagation of Acoustic Energy of Realistic Sources, WNT, Warszawa 2005 (in Polish)
• [13] R. Wyrzykowski, Linear Theory of Acoustic Field of Gas Medium, Rzeszów Society of Science Friends, Rzeszów 1970 (in Polish)

Identifiers

DOI

10.12693/APhysPolA.121.A-132