An impedance based method for acoustical absorption coefficient measurement and membrane health monitoring

Impedance, as one of frequency response functions, characterizes the dynamic behavior of the system and does not change with external excitations. Mechanical impedance is useful for applications such as modal testing, mechanical design and vibration monitoring, while acoustical impedance is closely...

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Main Author: Xie, Jin
Other Authors: Ling Shih-Fu
Format: Theses and Dissertations
Language:English
Published: 2010
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Online Access:https://hdl.handle.net/10356/41752
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-417522023-03-11T17:48:44Z An impedance based method for acoustical absorption coefficient measurement and membrane health monitoring Xie, Jin Ling Shih-Fu School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics Impedance, as one of frequency response functions, characterizes the dynamic behavior of the system and does not change with external excitations. Mechanical impedance is useful for applications such as modal testing, mechanical design and vibration monitoring, while acoustical impedance is closely related with the characterization of sound absorption material. However, measurement methods of acoustical/mechanical impedance are not as developed as for their theoretical counterparts due to lack of appropriate transducers to measure excitation or response variables. In this thesis, based on the simultaneous sensing and actuating (SSA) capability of a dynamic microphone, the absorption coefficient of acoustical materials is measured and the state of health of a membrane is monitored at the end of a tube. In addition, a similar SSA technique is studied for a micro PZT cantilever transducer to measure mechanical impedance of micro structures. The SSA capability of a dynamic microphone is firstly studied. With the calibrated transduction matrix, the dynamic microphone could perform well as a simultaneous sensor and actuator, which is validated by the measurement of mechanical impedance of point masses. DOCTOR OF PHILOSOPHY (MAE) 2010-08-06T07:37:09Z 2010-08-06T07:37:09Z 2008 2008 Thesis Xie, J. (2008). An impedance based method for acoustical absorption coefficient measurement and membrane health monitoring. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/41752 10.32657/10356/41752 en 207 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics
spellingShingle DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics
Xie, Jin
An impedance based method for acoustical absorption coefficient measurement and membrane health monitoring
description Impedance, as one of frequency response functions, characterizes the dynamic behavior of the system and does not change with external excitations. Mechanical impedance is useful for applications such as modal testing, mechanical design and vibration monitoring, while acoustical impedance is closely related with the characterization of sound absorption material. However, measurement methods of acoustical/mechanical impedance are not as developed as for their theoretical counterparts due to lack of appropriate transducers to measure excitation or response variables. In this thesis, based on the simultaneous sensing and actuating (SSA) capability of a dynamic microphone, the absorption coefficient of acoustical materials is measured and the state of health of a membrane is monitored at the end of a tube. In addition, a similar SSA technique is studied for a micro PZT cantilever transducer to measure mechanical impedance of micro structures. The SSA capability of a dynamic microphone is firstly studied. With the calibrated transduction matrix, the dynamic microphone could perform well as a simultaneous sensor and actuator, which is validated by the measurement of mechanical impedance of point masses.
author2 Ling Shih-Fu
author_facet Ling Shih-Fu
Xie, Jin
format Theses and Dissertations
author Xie, Jin
author_sort Xie, Jin
title An impedance based method for acoustical absorption coefficient measurement and membrane health monitoring
title_short An impedance based method for acoustical absorption coefficient measurement and membrane health monitoring
title_full An impedance based method for acoustical absorption coefficient measurement and membrane health monitoring
title_fullStr An impedance based method for acoustical absorption coefficient measurement and membrane health monitoring
title_full_unstemmed An impedance based method for acoustical absorption coefficient measurement and membrane health monitoring
title_sort impedance based method for acoustical absorption coefficient measurement and membrane health monitoring
publishDate 2010
url https://hdl.handle.net/10356/41752
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