NAH method for reducing sound source generated in air-conditioning rotary compressor

The paper demonstrates how to deal with the Near-field Acoustic Holography method (NAH) for reducing noise source which is generated in air-conditioning compressor. Sound radiation was measured for both normal compressor and fault compressor. The acoustic noise holograms are predicted by measuring at discrete multiple points around the two compressors and are thereafter reconstructed on the surface of the compressors. 1344 measuring points are used by two microphones in which one is scanning microphone and the other is reference microphone. NAH is a good tool for the visualization of Sound so we can show the source of sound graphically. In this paper, the NAH method found the exact noise source position on the surface of the compressor and the noise-related sub part in the compressor. We found the NAH and is very useful as a noise reduction tool for home-appliance device.

[1]  R. Raangs,et al.  A Low-Cost Intensity Probe , 2003 .

[2]  Kang,et al.  The use of partially measured source data in near-field acoustical holography based on the BEM , 2000, The Journal of the Acoustical Society of America.

[3]  Kazuhiko Sato,et al.  Predict of noise from a scroll compressor , 2011 .

[4]  Victor Isakov,et al.  On theory and application of the Helmholtz equation least squares method in inverse acoustics , 2002 .

[5]  J. Ih,et al.  On the reconstruction of the vibro‐acoustic field over the surface enclosing an interior space using the boundary element method , 1996 .

[6]  Wu.  On reconstruction of acoustic pressure fields using the Helmholtz equation least squares method , 2000, The Journal of the Acoustical Society of America.

[7]  Earl G. Williams,et al.  Nearfield acoustical holography using an underwater, automated scanner , 1985 .

[8]  Bo-Ha Lee,et al.  3-D sound source reconstruction and field reprediction using the Helmholtz integral equation , 1990 .

[9]  J. D. Maynard,et al.  Nearfield acoustic holography: I. Theory of generalized holography and the development of NAH , 1985 .

[10]  E. Williams.  Regularization methods for near-field acoustical holography. , 2001, The Journal of the Acoustical Society of America.

[11]  Earl G. Williams.  An overview of the inverse problem for sound reconstruction in interior spaces , 1999 .

[12]  de Bree.  The Microflown, an acoustic particle velocity sensor , 2003 .

[13]  E. Williams,et al.  Fourier Acoustics: Sound Radiation and Nearfield Acoustical Holography , 1999 .

[14]  Sean F. Wu.  On reconstruction of acoustic pressure fields using the HELS method , 1998 .

[15]  B H Houston,et al.  Interior near-field acoustical holography in flight. , 2000, The Journal of the Acoustical Society of America.

[16]  K. Sano,et al.  Analysis of Hermetic Rolling Piston Type Compressor Noise, and Countermeasures , 1984 .