Sound Absorption of Hybrid Passive-Active System Using Finite Flexible Micro-Perforated Panels

Although the vibration effect of micro-perforated panels (MPPs) in passive sound absorption systems has been considered in some studies, research into active systems remains to be accomplished. In this paper, theoretical and experimental studies of hybrid systems using finite flexible MPPs are presented. The impedance of the flexible MPP is derived using the modal analysis solution of the classical plate equation. Then absorption coefficients are predicted based on an electro-acoustic equivalent circuit model. A study of the absorption mechanism of the hybrid system shows that panel vibration can degrade the Helmholtz-resonance absorption performance and bring out panel-type absorption, especially increasing the cavity absorption in systems using impedance-matching conditions. Theoretical results show good agreement with the experiments. It can be seen that flexible the MPP has the potential to dissipate more energy and can be utilized to improve the absorption performance of the hybrid system by appropriately selecting parameters.

[1]  D. A. Blaser,et al.  Transfer function method of measuring in-duct acoustic properties. I - Theory. II - Experiment , 1980 .

[2]  H. Olson.  Electronic Sound Absorber , 1953 .

[3]  Marie-Annick Galland,et al.  SURFACE IMPEDANCE CONTROL FOR SOUND ABSORPTION: DIRECT AND HYBRID PASSIVE/ACTIVE STRATEGIES , 1997 .

[4]  F. J. Fahy.  A Technique for Measuring Sound Intensity with a Sound Level Meter , 1977 .

[5]  Li Cheng,et al.  Sound absorption of a micro-perforated panel backed by an irregular-shaped cavity. , 2010, The Journal of the Acoustical Society of America.

[6]  Marie-Annick Galland,et al.  Noise reduction in a flow duct: Implementation of a hybrid passive/active solution , 2006 .

[7]  D. Takahashi,et al.  Flexural vibration of perforated plates and porous elastic materials under acoustic loading. , 2002, The Journal of the Acoustical Society of America.

[8]  Pedro Cobo,et al.  Low-frequency absorption using a two-layer system with active control of input impedance. , 2003, The Journal of the Acoustical Society of America.

[9]  D. Maa,et al.  Potential of microperforated panel absorber , 1998 .

[10]  R. Burdisso,et al.  A new hybrid passive/active noise absorption system , 1997 .

[11]  George W. Swenson,et al.  Compact Sound Absorbers for Low Frequencies , 1992 .

[12]  Dieter Guicking,et al.  An Active Sound Absorber With Porous Plate , 1984 .

[13]  H. Kraus,et al.  Literature Review : VIBRATION OF PLATES Arthur W. Leissa NASA SP-160, Scientific and Technical Information Division, National Aeronautics and Space Administration, Washington, D. C. (1969) , 1972 .

[14]  Yiu-Yin Lee,et al.  Widening the sound absorption bandwidths of flexible micro-perforated curved absorbers using structural and acoustic resonances , 2007 .

[15]  Eric Wai Ming Lee,et al.  Sound absorption of a finite flexible micro-perforated panel backed by an air cavity , 2005 .

[16]  Arthur W. Leissa,et al.  Vibration of Plates , 2021, Solid Acoustic Waves and Vibration.

[17]  Masayuki Morimoto,et al.  Double-leaf microperforated panel space absorbers: A revised theory and detailed analysis , 2009 .

[18]  Pedro Cobo,et al.  Hybrid passive-active sound absorption in a standing wave tube using a thin plate actuator as secondary source , 2004 .

[19]  Masahiro Toyoda,et al.  Relationship between Helmholtz-resonance absorption and panel-type absorption in finite flexible microperforated-panel absorbers , 2010 .

[20]  Pedro Cobo,et al.  Hybrid passive–active absorption using microperforated panels , 2004 .

[21]  P. Nelson,et al.  An adaptive controller for the active absorption of sound , 1992 .

[22]  Marie-Annick Galland,et al.  Hybrid passive/active absorbers for flow ducts , 2005 .