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Active noise control in acoustic shutters

机译:隔音百叶窗中的主动噪声控制

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摘要

This article presents a hybrid acoustic technique applied to an acoustic shutter. It uses active noise control (ANC) at frequencies below 1000 Hz and acoustic foam, glued at the shutter walls, to attenuate frequencies above 1000 Hz. The use of the active noise control applied to acoustic shutters to increase the performance of noise attenuation in low frequencies. The control system was the Feedforward Filtered-x Least Mean Square (FxLMS) scheme and the influence of the actuator speaker position. It was implemented a low-cost active noise control using ARDUINO DUE. At low frequencies, without active noise control, the average insertion loss of the acoustic shutter is approximately 7 dB. Up to cutoff frequency (565 Hz) of the acoustic shutter, the highest attenuation due to active noise control was approximately 14 dB in 125 Hz discrete frequency and 17 dB in 400 Hz 1/3 octave band. The results between 500 and 1000 Hz were interesting since the active noise control was not expected to be efficient above the cutoff frequency of the acoustic chamber. The highest attenuation was 17.5 dB at the frequency of 710 Hz. From 100 to 8000 Hz an average attenuation of 13 dB (1/3 octave bands) was observed using the semi-active apparatus presented in this article. (C) 2019 Elsevier Ltd. All rights reserved.
机译:本文介绍了一种应用于声学快门的混合声学技术。它使用低于1000 Hz频率的主动噪声控制(ANC),并在百叶窗壁上粘贴隔音泡沫,以衰减高于1000 Hz的频率。将主动噪声控制应用于声波百叶窗可以提高低频噪声衰减的性能。控制系统是前馈滤波x最小均方(FxLMS)方案,并且受执行器扬声器位置的影响。它使用ARDUINO DUE实现了低成本的有源噪声控制。在低频情况下,如果没有主动噪声控制,声学快门的平均插入损耗约为7 dB。直到声学快门的截止频率(565 Hz),由于主动噪声控制而导致的最大衰减在125 Hz离散频率下约为14 dB,而在400 Hz 1/3倍频程中约为17 dB。 500到1000 Hz之间的结果很有趣,因为在噪声室的截止频率之上,有源噪声控制并没有达到预期的效果。在710 Hz的频率下,最高衰减为17.5 dB。在100至8000 Hz范围内,使用本文介绍的半有源设备观察到的平均衰减为13 dB(1/3倍频程)。 (C)2019 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Applied Acoustics》 |2019年第9期|41-46|共6页
  • 作者单位

    Univ Fed Triangulo Mineiro, VibroAcoust Lab, Mech Engn Dept, Av Randolfo Borges Junior 1400, BR-38064200 Uberaba, MG, Brazil;

    Univ Fed Uberlandia, LAV Vibrat & Acoust Lab, Sch Mech Engn, Av Joao Naves de Avila 2121, BR-38408196 Uberlandia, MG, Brazil;

    Univ Fed Uberlandia, LAV Vibrat & Acoust Lab, Sch Mech Engn, Av Joao Naves de Avila 2121, BR-38408196 Uberlandia, MG, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Active noise control; Acoustic shutters; Feedforward FxLMS;

    机译:主动降噪;隔音百叶窗;前馈FxLMS;

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