Investigation of errors and uncertainty in low-frequency impedance tube measurements
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Authors
Ripley, Matthew
Issue Date
2025-08
Type
Electronic thesis
Thesis
Thesis
Language
en_US
Keywords
Architectural sciences
Alternative Title
Abstract
The accuracy of impedance tube measurements can be improved by determining the acoustic conditions within the impedance tube prior to introducing a sample for test. By measuring the empty impedance tube, the influence of environmental changes on critical parameters can be quantified. Low-frequency dissipation is estimated using Bayesian inference to incorporate into a transfer function model, reducing error when measuring samples. Previous work has focused on a frequency range of 1.5 kHz - 5 kHz; the subject of this study is a lower frequency range (sub-1.5 kHz) using larger sized impedance tubes. The empty tube model is then used to validate the acoustic performance of jute and thermoplastic starch-based microslit panel absorbers. By determining conformity of alternative-material acoustic elements to modeled behavior, and including acoustic testing in the design process, the viability of sustainable material substitutions can be determined.
Description
August2025
School of Architecture
School of Architecture
Full Citation
Publisher
Rensselaer Polytechnic Institute, Troy, NY