4.7 Article

Optimisation of micro-perforated cylindrical silencers in linear and nonlinear regimes

期刊

JOURNAL OF SOUND AND VIBRATION
卷 363, 期 -, 页码 359-379

出版社

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2015.11.011

关键词

Micro-perforated panel; Cylindrical silencer; Nonlinear regime; Optimisation study; Acoustic dissipation; Transmission loss

资金

  1. Carnot STAR Institute in France
  2. Ministerio de Economia y Competitividad in Spain [BIOWING TRA2014-56639-R]

向作者/读者索取更多资源

This paper describes analytical and experimental studies conducted to understand the potential of lightweight non-fibrous alternatives to dissipative mufflers for in-duct noise control problems, especially under high sound pressure levels (SPLs) and in the low frequency domain. The cost-efficient multi-modal propagation method has been extended to predict nonlinear effects in the dissipation and the transmission loss (TL) of micro-perforated cylindrical liners with sub-millimetric holes diameter. A validation experiment was performed in a standing wave tube to measure the power dissipated and transmitted by a nonlocally reacting liner under moderate and high SPLs. Although nonlinear effects significantly reduce the dissipation and TL around the liner maximum damping frequency, these power quantities may be enhanced below the half-bandwidth resonance. An optimal value of the in-hole peak particle velocity has been found that maximizes the TL of locally reacting liners at low frequencies. Optimisation studies based on dissipation or TL maximization showed the sensitivity of the liner constituting parameters to variations in the design target range such as the center frequency, the levels of acoustic excitation and the nature of the surface impedance (locally or nonlocally reacting). An analysis is proposed of the deviation observed at low frequencies between the optimum impedance of the locally reacting liner under moderate SPLs and Cremer's optimum impedances. (C) 2015 Elsevier Ltd. All rights reserved.

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