×

zbMATH — the first resource for mathematics

Sound field analysis and simulation for fluid machines. (English) Zbl 1195.76360
Authors’ abstract: Fluid machines, such as pumps, fans, and internal combustion engines, are widely used in duct systems for air-conditioning, cooling, ventilating, heat releasing, and dust collecting. Vibration and noise will be created when the fluid machine works with fans at various rotating speeds. Noise problems associated with fan installation are a concern in fluid machines. Methods to analyze the sound field and simulation of fan installation are, therefore, important for the design to reduce the noise output from fluid machines. In this paper the sound field is simulated by using the boundary element method, which is a numerical technique to reduce the boundary integral equations using the fundamental solution and Green’s transfer functions. For the sound field analysis, the geometry of fluid machines (the axial fan and centrifugal fan) and acoustic properties are modeled in Beasy software based on the boundary element method technology. The 1/1 octave frequency bands from 63 Hz to 8 kHz are selected for sound field analysis. The sound pressures of the fan and the motor in each octave band are calculated in terms of the rotating speed, flow volume, horse power and number of blades used. The results show that there is a high-level sound pressure inside the housing of the axial fan due to the sound source located there. The higher sound pressure level is observed on both the inlet and outlet. The results for the centrifugal fan are the higher the frequency, the heavier energy that is found to radiate around the sound source.

MSC:
76Q05 Hydro- and aero-acoustics
76M15 Boundary element methods applied to problems in fluid mechanics
76U05 General theory of rotating fluids
PDF BibTeX XML Cite
Full Text: DOI
References:
[1] Abom, M.; Boden, H.: A note on the aeroacoustic source character of in-duct axial fans, J sound vib 186, No. 4, 589-598 (1995) · Zbl 1049.76587
[2] Tyler, J. M.; Sofrin, T. G.: Axial flow compressor noise studies, SAE trans 70, 309-332 (1962)
[3] Lighthill MJ. On sound generated aerodynamically. I. General theory. In: Proc Annu Tech Meet, Tech Assoc Graphic Arts, vol. 211; 1952. p. 564 – 87. · Zbl 0049.25905
[4] Sharland, I. J.: Sources of noise in axial flow fans, J sound vib 1, No. 3, 302-322 (1964) · Zbl 0118.22202
[5] Lowson, M. V.: Theoretical analysis of compressor noise, J acoust soc am 47, No. 1, 371-385 (1970)
[6] Huang, L.: Characterizing computer cooling Fan noise, J acoust soc am 114, No. 6, 3189-3200 (2003)
[7] Ross, D. F.; Crocker, M. J.: Measurement of the acoustic internal source impedance of an internal combustion engine, J acoust soc am 74, No. 1, 18-27 (1983)
[8] Prasad, M. G.; Crocker, M. J.: Acoustical source characterization studies on a multi-cylinder engine exhaust system, J sound vib 90, No. 4, 479-490 (1983)
[9] O’neal DL, Maroney GE. An analysis of four methods for measuring pump fluid borne noise generation potential. In: National conference on fluid power; 1977. p. 18 – 23.
[10] Kathuriya, M. L.; Munjal, M. L.: Experimental evaluation of the aeroacoustic characteristics of a source of pulsating gas flow, J acoust soc am 65, No. 1, 240-248 (1979)
[11] Alves, H. S.; Doige, A. G.: A three-load method for noise source characterization in ducts, Noise-con 87, 329-334 (1987)
[12] Prasad, M. G.: A four load method for evaluation of acoustical source impedance in a duct, J sound vib 114, 347-356 (1987)
[13] Boden, H.: The multiple load method for measuring the source characteristics of time-variant sources, J sound vib 148, No. 3, 437-453 (1991)
[14] Lavrentjev, J.; Abom, M.; Boden, H.: A measurement method for determining the source data of acoustic two-port sources, J sound vib 183, No. 3, 517-531 (1995)
[15] Ciskowski, R. D.; Brebbia, C. A.: Boundary element method in acoustics, (1991) · Zbl 0758.76036
[16] Valdivia, N.; Williams, E. G.: Krylov subspace iterative methods for boundary element method based near-field acoustic holography, J acoust soc am 117, No. 2, 711-724 (2005)
[17] Trunzo, R.; Lakshminaryana, B.; Thompson, D. E.: Nature of inlet turbulence and strut flow disturbances and their effect on turbomachinery rotor noise, J sound vib 76, No. 2, 233-259 (1981)
[18] Fukano, T.; Takamatsu, Y.; Kodama, Y.: The effects of tip clearance on the noise of low pressure axial and mixed flow fans, J sound vib 105, No. 2, 291-308 (1986)
[19] Majumdar, S. J.; Peake, N.: Noise generation by the interaction between ingested turbulence and a rotating Fan, J fluid mech 359, 181-216 (1998) · Zbl 0915.76082
[20] Barron, R. F.: Industrial noise control and acoustics, (2003)
[21] Graham, J. B.: How to estimate Fan noise, J sound vib 6, 24-27 (1972)
This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. It attempts to reflect the references listed in the original paper as accurately as possible without claiming the completeness or perfect precision of the matching.