The sound absorptive mechanism and properties of the perforated panel resonator with flexible tube bundles are presented. Based upon that, some practical applications of the sound absorbing structure are introduced as follows. First of all, the perforated panel resonator with flexible tube bundles is used in designing a highly sound absorptive chamber, which is used as an audio-video laboratory. The acoustical performances of the chamber are presented. Second, the perforated panel resonator with flexible tube bundles is used in highly efficient duct silencer. The total noise level of axial fan source is attenuated to background noise level. Not only middle and high frequency noise is reduced, but also low frequency noise is suppressed considerably. Third, the perforated panel resonator with flexible tube bundles is used in a small-type centrifugal fan's casing treatments. The cut-off region of the centrifugal fan's casing is also acoustically treated. After the acoustical treatments, total sound power level of the fan is reduced obviously. Fourth, the perforated panel resonator with flexible tube bundles is used in designing the exhaust ducts and sound absorptive channel walls for an electrical transformer substation. The noise emitted from the transformer substation is reduced to surrounding background noise level.
This paper deals with a new type of resonant absorber, i.e., the perforated panel resonator with flexible tube bundle. The acoustical properties of the new sound-absorbing structure are measured and analyzed. From the measurement results and theoretical analysis, the following conclusions can be made. (1) The incorporation of the tube bundle into the resonator absorber is helpful to improve its low-frequency sound absorption. Because the artificial prolongation of air column length inside a hole neck will increase acoustic mass, resonance frequency can be shifted to a lower frequency correspondingly. (2) Compared with traditional perforated panel absorber, the acoustic resistance of the sound-absorbing structure can be increased considerably due to the incorporation of the flexible tube bundle into the resonator absorber, so that higher sound absorption coefficients can be expected. (3) By reasonably utilizing the tube and cavity coupling resonances, the frequency bandwidth of sound absorption of the perforated panel resonator with flexible tube bundle can be expected to broaden. The perforated panel resonator with flexible tube bundle may be used in some cases with strict space limitations and with expectations of increasing the sound absorption at lower frequencies.
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