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Title: Air transparent soundproof window

A soundproof window or wall which is transparent to airflow is presented. The design is based on two wave theories: the theory of diffraction and the theory of acoustic metamaterials. It consists of a three-dimensional array of strong diffraction-type resonators with many holes centered on each individual resonator. The negative effective bulk modulus of the resonators produces evanescent wave, and at the same time the air holes with subwavelength diameter existed on the surfaces of the window for macroscopic air ventilation. The acoustic performance levels of two soundproof windows with air holes of 20mm and 50mm diameters were measured. The sound level was reduced by about 30 - 35dB in the frequency range of 400 - 5,000Hz with the 20mm window, and by about 20 - 35dB in the frequency range of 700 - 2,200Hz with the 50mm window. Multi stop-band was created by the multi-layers of the window. The attenuation length or the thickness of the window was limited by background noise. The effectiveness of the soundproof window with airflow was demonstrated by a real installation.
Authors:
 [1] ;  [2]
  1. Division of Marine Engineering, Mokpo National Maritime University, Mokpo 530-729, R. O. Korea (Korea, Republic of)
  2. Korea Institute of Machinery and Materials, Yuseong-Gu, Daejeon 305-343, R. O. Korea (Korea, Republic of)
Publication Date:
OSTI Identifier:
22420163
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 11; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; AIR; DESIGN; DIFFRACTION; FREQUENCY RANGE; RESONATORS; THICKNESS; THREE-DIMENSIONAL LATTICES; VENTILATION