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ASTM Selected Technical Papers
Acoustic Emission: Current Practice and Future Directions
By
K Yamaguchi,
K Yamaguchi
2
University of Tokyo
?Tokyo,
Japan
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J Roget
J Roget
3
Nordon & Cie
?Nancy,
France
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ISBN-10:
0-8031-1389-7
ISBN:
978-0-8031-1389-3
No. of Pages:
459
Publisher:
ASTM International
Publication date:
1991
eBook Chapter
Cavitation Monitoring of Hydroturbines with RMS Acoustic Emission Measurement
By
O Derakhshan
,
O Derakhshan
1Mr. Derakhshan and Prof. Houghton are affiliated with Dept. of Mechanical Engineering,
Tennessee Technological University
, Cookeville, TN 38505
; Mr. Jones and Mr. March are engineers
at Engineering Laboratory, Tennessee Valley Authority
, Norris, TN 37828
.
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JR Houghton
,
JR Houghton
1Mr. Derakhshan and Prof. Houghton are affiliated with Dept. of Mechanical Engineering,
Tennessee Technological University
, Cookeville, TN 38505
; Mr. Jones and Mr. March are engineers
at Engineering Laboratory, Tennessee Valley Authority
, Norris, TN 37828
.
Search for other works by this author on:
RK Jones
,
RK Jones
1Mr. Derakhshan and Prof. Houghton are affiliated with Dept. of Mechanical Engineering,
Tennessee Technological University
, Cookeville, TN 38505
; Mr. Jones and Mr. March are engineers
at Engineering Laboratory, Tennessee Valley Authority
, Norris, TN 37828
.
Search for other works by this author on:
PA March
PA March
1Mr. Derakhshan and Prof. Houghton are affiliated with Dept. of Mechanical Engineering,
Tennessee Technological University
, Cookeville, TN 38505
; Mr. Jones and Mr. March are engineers
at Engineering Laboratory, Tennessee Valley Authority
, Norris, TN 37828
.
Search for other works by this author on:
Page Count:
11
-
Published:1991
Citation
Derakhshan, O, Houghton, J, Jones, R, & March, P. "Cavitation Monitoring of Hydroturbines with RMS Acoustic Emission Measurement." Acoustic Emission: Current Practice and Future Directions. Ed. Sachse, W, Yamaguchi, K, & Roget, J. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 : ASTM International, 1991.
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Acoustic Emission measurements are shown to be a reliable indicator of cavitation pressure pulses. The method of display is the root mean square, RMS, of the AE signal integrated over 1 second that is proportional to the average cavitation energy. An inexpensive AE transducer, amplifier, filter, and RMS circuit is described with a gain of 22 dB and a frequency range of 10 kHz to 1.25 MHz. Data from two laboratory controlled cavitation experiments is presented. The system is tested on two TVA hydroturbines. Kaplan-type and Francis-type turbines had a similar shaped increased RMS AE curve with wicket gate opening but the numerical maximum values are different in each hydroturbine installation. A real-time continuous RMS AE monitor is recommended on each hydroturbine for the evaluation and control of cavitation erosion.
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Derakhshan
, O.
, “Acoustic Emission Monitoring of Cavitation in Hydroturbines
,” M.Sc. thesis, Department of Mechanical Engineering, Tennessee Technological University
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,” Report No. WR28-4-900-234, Tennessee Valley Authority Engineering Laboratory
, Norris, Tennessee, 03
1989
.
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