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Assessment of Absorbers in Normal-Incidence Four- Microphone Transmission-Loss Systems to Measure Effectiveness of Materials in Lateral-Flow Configurations of Filled or Partially Filled Cavities
Technical Paper
2007-01-2190
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The four-microphone standing wave tube system has proven useful for measuring the absorption and transmission loss of various fibrous and non-fibrous absorbers. The system is fast, repeatable, accurate and compact.
This paper discusses the advantages of the four-microphone system for measuring the transmission loss in lateral-flow absorber systems. The original four-microphone round impedance tube system and the migration to a four-microphone square tube system are discussed. The four-microphone square tube system allows effective study of filled and partially filled cavities.
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Pieper, R., Alexander, J., Bolton, J., and Yoo, T., "Assessment of Absorbers in Normal-Incidence Four- Microphone Transmission-Loss Systems to Measure Effectiveness of Materials in Lateral-Flow Configurations of Filled or Partially Filled Cavities," SAE Technical Paper 2007-01-2190, 2007, https://doi.org/10.4271/2007-01-2190.Also In
References
- Yoo, T Alexander, J Bolton, J.S. “The Use of a Four-Microphone Standing Wave Tube to Estimate the Anistropic Properties of Fibrous Noise Control Materials,” Inter-Noise 2006 Honolulu, HI 2006
- Bolton, J.S. “Porous Materials for Sound Absorption and Transmission Control,” Inter-Noise 2005 Rio de Janeiro, Brazil 2005
- Kim, J Yoo, T Bolton J.S. Alexander, J. “The Correlation of the Performance of the Duct Lining Materials with Their Normal Incidence Properties,” Inter-Noise 2005 Rio de Janeiro, Brazil 2005
- Yoo, T Bolton J.S. Alexander, J. “Prediction of Random Incidence Transmission Loss based on Normal Incidence Four-Microphone Measurements,” Inter-Noise 2005 Rio de Janeiro, Brazil 2005
- Lai, H Alexander, J Bolton, J.S. “Structural Damping by the Use of Fibrous Blankets,” Noise-Con 98 Ypsilanti, MI 1998