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Reconstruction of blockage in a duct from single spectrum

โœ Scribed by Wu Qunli

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
302 KB
Volume
41
Category
Article
ISSN
0003-682X

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โœฆ Synopsis

A BS TRA C T

In some industrial practices it is important to detect blockages developing in the ducts and pipeline systems, especially in the nuclear power industry where safeO' is vital. In this paper, the properties of eigenfrequeney shifts of a duct with blockages are studied. It is .found that the sum of the eigenfrequency shifts over a number of modes is close to zero for the duct with the blockage. A new method is proposed to reconstruct the blockage location and its size in the duct. The method requires only one spectrum of the blocked duct under asymmetrical boundao' condition. The experimental results show that the new method can be as accurate as the method which requires four spectra data.

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