Basic study on active acoustic shielding (Improving noise-reducing performance in low-frequency range)
Active acoustic shielding (AAS) is a system that can attenuate a sound passing through an open window. An AAS is constructed from a number of AAS cells set in an array having an approximately co-located microphone and speaker system. The concept of AAS was previously demonstrated and some simple sim...
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Published in | Mechanical Engineering Journal Vol. 1; no. 6; p. EPS0065 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
The Japan Society of Mechanical Engineers
01.01.2014
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Abstract | Active acoustic shielding (AAS) is a system that can attenuate a sound passing through an open window. An AAS is constructed from a number of AAS cells set in an array having an approximately co-located microphone and speaker system. The concept of AAS was previously demonstrated and some simple simulations and experiments were performed. Moreover, an AAS window with four AAS cells was proved to be effective for not only a single stable noise source but also multiple noise sources and moving noise sources. However, the AAS window could only attenuate noise with frequencies from 500Hz to 2 kHz, and could not attenuate noise below 500 Hz, which is dominant in construction sites and daily life. Therefore, in this paper, a new AAS window consisting of two different AAS units in one window is proposed. One of the units attenuates low-frequency sound and the other attenuates high-frequency sound. These units are controlled independently. The new AAS window was fabricated and experimentally evaluated in an anechoic room. It was found that the new AAS window reduced noise by 5 to 15 dB in the frequency range from 300 Hz to 2 kHz over a wide area in the room. |
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AbstractList | Active acoustic shielding (AAS) is a system that can attenuate a sound passing through an open window. An AAS is constructed from a number of AAS cells set in an array having an approximately co-located microphone and speaker system. The concept of AAS was previously demonstrated and some simple simulations and experiments were performed. Moreover, an AAS window with four AAS cells was proved to be effective for not only a single stable noise source but also multiple noise sources and moving noise sources. However, the AAS window could only attenuate noise with frequencies from 500Hz to 2 kHz, and could not attenuate noise below 500 Hz, which is dominant in construction sites and daily life. Therefore, in this paper, a new AAS window consisting of two different AAS units in one window is proposed. One of the units attenuates low-frequency sound and the other attenuates high-frequency sound. These units are controlled independently. The new AAS window was fabricated and experimentally evaluated in an anechoic room. It was found that the new AAS window reduced noise by 5 to 15 dB in the frequency range from 300 Hz to 2 kHz over a wide area in the room. |
Author | SAKURAMA, Kazunori NISHIDA, Shin-ichiro NISHIMURA, Masaharu MURAO, Tatsuya |
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CitedBy_id | crossref_primary_10_1016_j_buildenv_2018_05_042 crossref_primary_10_3390_app10196817 crossref_primary_10_1080_15376494_2021_1995549 crossref_primary_10_1016_j_ymssp_2024_111224 crossref_primary_10_1299_mej_15_00322 crossref_primary_10_1038_s41598_020_66563_z crossref_primary_10_1016_j_buildenv_2021_107928 |
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References | Nishimura, M., Ohnishi, K., Patrick, P. W. and Zander, C. A., Development of active acoustic treatment (phase 1; basic concept and development of AAT-cell, Proceeding of ACTIVE 97 (1997), pp. 319-330. Nishimura, M., Goto, T. and Kanamori, N., Basic research on active sound Insulation unit, Proceeding of ICA 2004 (2004), pp.Ⅲ2169-2172. Roure, A., Herzog, P. and Pinhede, C., Active barrier for airport noise, Proceedings of INTER-NOISE 2006, (2006), CD-ROM. Murao, T. and Nishimura, M., Basic study on active acoustic shielding, Proceeding of Journal of Environment and Engineering, Vol.7, No.1 (2012a). Sano, H. and Adachi, S., Two-degree-of-freedom active control of road noise inside automobiles, Proceedings of ACTIVE 97 (1997); pp. 543-546. Ohnishi, K., Saito, T., Teranishi, S., Namikawa, Y., Mori, T., Kimura, K. and Uesaka, K., Development of the product-type active soft edge barrier, Proceeding of ICA 2004 (2004), pp.Ⅱ1041-1044. Kuo, M. S. and Morgan, R. D., Active noise control systems (1996), Wiley. Ise, S., A principle of sound field control based on the kirchhoff-hermholtz integral equation and theory of inverse system, Acustica,Vol.85 (1999), pp.78-87. Gardonio, P., Sensor-actuator transducers for smart panels, proceedings ACTIVE 2006(2006), CD-ROM. Murao, T. and Nishimura.M., Basic study on active acoustic shielding: phase 3 improving noise reducing performance in low frequency region, Proceeding of INTER-NOISE 2011 (2011), CD-ROM. Murao, T., Nishimura, M. and Sakurama, K., Basic study on active acoustic shielding: phase 4 improving noise reducing performance in low frequency-2, Proceeding of INTER-NOISE 2012 (2012b), CD-ROM. Nishimura, M., Ohnishi, K., Kanamori, N. and Umebayashi, Y., Feasibility study on active noise control for moving dources in the open field using directional microphones and directional speakers, Proceedings of ACTIVE 2006 (2006), CD-ROM. 11 1 12 2 3 4 5 6 7 8 9 10 |
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SubjectTerms | Active acoustic shielding Active noise control Moving noise sources Multiple filtered-X-LMS Multiple noise sources |
Title | Basic study on active acoustic shielding (Improving noise-reducing performance in low-frequency range) |
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