Effect of contamination on acoustic performance of microperforated panels

J. Liu, D. W. Herrin

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Microperforated panel (MPP) absorbers are rugged, non-combustible, and do not deteriorate over time. That being the case, they are especially suitable for long term use in harsh environments. However, the acoustic performance is modified when contaminated by dust, dirt, or fluids (i.e. oil, water). This paper examines that effect experimentally and correlates the absorption performance with Maa's theory for micro-perforated panels. Transfer impedance and absorption coefficient are measured for different levels of aluminum oxide and carbon dust accumulation. The amount of dust contamination is quantified by measuring the luminance difference between clean and dirty panels with a light meter. The porosity and hole diameter in Maa's equation are modified to account for dust obstruction. The effect of coating the MPP with oil, water, and other appropriate viscous fluids was also measured. This effect was simulated by modifying the viscous factor in Maa's equation.

Original languageEnglish
JournalSAE Technical Papers
StatePublished - 2011
EventSAE 2011 Noise and Vibration Conference and Exhibition, NVC 2011 - Rapids, MI, United States
Duration: May 16 2011May 19 2011

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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