Measurement and validation of acoustic source characteristics
Measurement and validation of acoustic source characteristics
To measure insertion loss of muffler, one needs to calculate the source impedance. The internal impedance of a sound source can be measured using direct or indirect methods. The four-load SPL measurement method is one such indirect method wherein there are three nonlinear equations in terms of two unknowns which makes one of the equations redundant. This leads to erroneous results. To overcome this inherent weakness, two alternatives multi-load methods have been offered in the literature; namely, the least squares and the direct least squares method, to analyze the measured data used for four (or more) different loads. These two methods produce better results than the four-load SPL measurement method used earlier. These measurement methods have been tested on a loudspeaker to measure its source impedance and the results are validated with a known additional acoustic load. An extensive literature review had been done and presented in this paper.
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Munjal, M L
ba43c325-ed0a-48b1-82c6-7efcc77834a0
2011
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Munjal, M L
ba43c325-ed0a-48b1-82c6-7efcc77834a0
Paruchuri, Chaitanya and Munjal, M L
(2011)
Measurement and validation of acoustic source characteristics.
Journal of the Acoustical Society of India.
Abstract
To measure insertion loss of muffler, one needs to calculate the source impedance. The internal impedance of a sound source can be measured using direct or indirect methods. The four-load SPL measurement method is one such indirect method wherein there are three nonlinear equations in terms of two unknowns which makes one of the equations redundant. This leads to erroneous results. To overcome this inherent weakness, two alternatives multi-load methods have been offered in the literature; namely, the least squares and the direct least squares method, to analyze the measured data used for four (or more) different loads. These two methods produce better results than the four-load SPL measurement method used earlier. These measurement methods have been tested on a loudspeaker to measure its source impedance and the results are validated with a known additional acoustic load. An extensive literature review had been done and presented in this paper.
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Published date: 2011
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Local EPrints ID: 435311
URI: http://eprints.soton.ac.uk/id/eprint/435311
PURE UUID: 9645a1ba-0648-4d93-9a1d-07ee6529c9c1
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Date deposited: 30 Oct 2019 17:30
Last modified: 22 Feb 2023 19:26
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M L Munjal
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