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Indirect measurement of acoustic power into a small room at low frequencies

机译：在低频下间接测量进入小房间的声功率

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摘要

An essential step towards improving sound insulation is a reliable means of quantifying the performance. However, for various reasons sound insulation measurements at low frequencies are associated with relatively high uncertainty and wide variance values. The objective of this research is to develop a method of sound insulation measurement which complements the standard SO 140 measurement methods by providing improved accuracy at low frequencies. In this paper part of the problem is considered, namely the measurement of power radiated into the receiver room. The 'peak envelope method' is based on mode theory and the measurement employs a pair of microphones in the receiver room and a calibrated volume velocity source. No reverberation time measurements are required. The theory is outlined and computer simulations and trial measurements are carried out in order to validate the theory. Good agreement in numerical and experimental validation is demonstrated. We conclude that the peak envelope method is suitable for the measurement of radiated sound power at modal frequencies where ISO 140 methods are poorly adapted. In order to obtain transmission loss, a measure of incident power in the source room will also be required, which will be the subject of future works.
机译：改善隔音的重要步骤是量化性能的可靠方法。但是，由于各种原因，低频的隔音测量与相对较高的不确定性和较大的方差值相关。这项研究的目的是开发一种隔音测量方法，通过提高低频精度来补充标准的SO 140测量方法。本文考虑了部分问题，即辐射到接收室的功率的测量。 “峰值包络法”基于模式理论，该测量在接收室中使用一对麦克风和校准的体积速度源。不需要混响时间测量。概述了该理论，并进行了计算机仿真和试验测量以验证该理论。在数值和实验验证中证明了良好的一致性。我们得出的结论是，峰值包络法适合于模态频率处的辐射声功率测量，而ISO 140方法的适应性较差。为了获得传输损耗，还需要测量源房间中的入射功率，这将是未来工作的主题。

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  • 来源
    《Applied Acoustics》 |2012年第3期|p.248-255|共8页
  • 作者

    Elisabeth de A.C.Duarte; Andy Moorhouse; Elvira B. Viveiros;

  • 作者单位

    Department of Architecture and Urbanism, Universidade Federal de Alagoas, Av. Manuel Severino Barbosa, s. Bom Sucesso, 57309-005 Arapiraca, AL, Brazil;

    Acoustics Research Centre, University o/Salford, Salford, Greater Manchester M5 4WT, UK;

    Department of Architecture and Urbanism, Universidade Federal de Santa Catarina, Caixa Postal 476, 88040-900 Florianopolis, SC, 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

    sound insulation measurement; low frequency; sound power;

    机译：隔音测量;低频声功率;

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