Abstract
Base on Prof. Maa Dah-You’s general theory of the microperforated-panel (MPP) absorber, We designed a noise reduction structure-sound attenuating cabinet (SAC). It can be applied to air-cooled communication products to reduce system noise. This article introduces engineering design method of SAC and laboratory test noise reduction results of application of SAC.
Highlights
It can be applied to air-cooled communication products to reduce system noise
Since the late 60s of the 20th Prof Maa Dah-You proposed the theory of microperforated-panel (Mpp) absorber [1] [2], MPP absorber has been widely used in acoustics area [3]
MPP absorber may be widely used in high-speed airflow and high-sounding pipe system
Summary
Since the late 60s of the 20th Prof Maa Dah-You proposed the theory of microperforated-panel (Mpp) absorber [1] [2], MPP absorber has been widely used in acoustics area [3]. It is a good resonant sound absorber with simple structure and less affected by the wind [4]. MPP absorber may be widely used in high-speed airflow and high-sounding pipe system. These advantages of MPP absorber make it is possible to be applied for our company’s air-cooled communication products [5]. Base on the accurate theory of MPP, We designed a noise reduction structure named Sound attenuating cabinet (SAC). The resonance frequency f0 satisfies the following Equation (6). The Relative acoustic resistance r satisfies the following Equation (8), according to Equation (8), can get P of MPP:. For two-layer MPP, the resonant frequency f0 is equal to or lower than the value determined by the following equation: ωm
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