Fiber-free duct damper with woven metal mesh
In this study, Dr. Anne de Jong analyzes a compartmentalized damper in which woven stainless steel (porosity ~1%, pore size ~0.07 mm) acts as an acoustic liner. Sound dissipation results from thermoviscous losses in the mesh. The acoustic impedance was measured in a four-microphone impedance tube. Based on the Sullivan-Crocker theory, the author derives a 1D transfer matrix model in LRFTubes. Comparison with 3D-FEM shows good agreement for transmission loss below the cut-on frequency, validated by a physical damper measurement (28 dB(A) reduction).
Citation for the publication
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Author: Dr. Anne de Jong, M.S. (ASCEE)
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Event: NAG Lecture Day (Dutch Acoustical Society) – Exhaust Engineering
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Date: April 10, 2019
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Subject: Compartmentalized cavity dampers, woven stainless steel liners, Sullivan-Crocker model, LRFTubes, and FEM validation
