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Reduce costs with acoustic emission cool-down monitoring
ND T Abstracts emission parameters to monitor surface roughness, a set-up is proposed to reach to this goal.
Gandy, T.; Bailey, J. Reduce costs with acoustic emission cool-down monitoring
48807
Hydrocarbon Processing, Vol. 71, No. I, pp. 66-67 (Jan. 1992) Planned shutdown of nuclear reactors provides routine maintenance and time to inspect possible structural defects but is expensive and so must be minimized. This article describes how acoustic emission cool- down monitoring can he used to improve turnaround for such maintenance operations. The techniques provides 100% volumetric inspection of a reactor and related systems in a very short period. It also allows maintenance crews to concentrate their inspection and repair effort appropriately.
Brown, L.F.; Brown, R.H. Permanently mounted piezo film sensors for s t r u c t u r a l q u a n t i t a t i v e NDE
48625
Review of Progress in Quantitative Nondestructive Evaluation, La Jolla, California (United States), 15-20 Jul. 1990. Vol. 10A, pp. 853-859. Edited by D.O. Thompson, and D.E. Chimenti. Plenum Press (1991). ISBN 0-306-43903-4. Piezo film sensors have been successfully demonstrated for permanently mounted structural quantitative NDE. Their unique physical properties were shown to make them well suited for novel applications for ultrasonic, acoustic emission, and impact detection sensing which conventional sensor technologies are unable to address. Their broadband high-sensitivity properties and unique form factor will make them valuable for future in-service QNDE applications.
Two requirements for systems for continuous inspection of plate material structures are named, determination of the coordinates of fatigue cracks and detection of areas of corrosion wear. t:or solution of the first problem a new principle of construction of acoustic emission systems with combined channels is proposed. A variation of calculation of the probability of overlapping of signals is proposed. For solution of the second problem use of the dispersion properties of Lamb waves is proposed. Equations making it possible to theoretically determine the size of the wear area and the residual thickness of the plate are obtained. 47821 Michaels, KJ. O n - o r b i t m o n i t o r i n g of hypervelocity i m p a c t d a m a g e on space
structures NDE: The Next Decade and Beyond. 1990 ASNT Spring Conference, San Antonio, Texas (United States), 19-23 Mar. 1990. pp. 35-37. ASNT (1990) Large space structures used for manned activities are vulnerable to damage from orbital debris and impacts from hypervelocity particles in space. To ensure structure integrity and crew safety, various nondestructive inspection methods are assessed. Their aim is to detect beyond some threshold level, where and when damage occurs and to assess its seriousness. Limitations include weight restrictions, available space, limited computer time and long term system reliability. Two promising methods emerged for monitoring hypervelocity particle impact, thin film kynar sensors on the inside of shield surfaces, and acoustic emission sensing, both using piezo film technology. This cheap flexible, lightweight tough polymer film offers many desirable sensor characteristics such as wide frequency and dynamic ranges, low acoustic impedance and high voltage output, strength and chemical and temperature stability.
48308
Hutton, D. V. A non-contact acoustic emission sensing system for rotatingc u t t e r machining processes
47792
Proceedings o f the 1990 SEM Spring Conference on Experimental Mechanics, Albuquerque, New Mexico (United States), 4-6 Jun. 1990. pp. 551-557. Society for Experimental Mechanics (1990) Continuing development of an acoustic emission sensing system for monitoring rotating cutter machining processes is discussed. The path for transmission of acoustic emission signals is a fluid located between the rotating spindle of a machine tool and a piezoelectric transducer. The objective of this arrangement is to eliminate to the extent possible other AE sources and signal distorting elements such as bearings from the signal transmission path. Success with a prototype system has shown the feasibility of the approach. A second design for a larger machine tool has been evaluated and this has led to a third generation design which is in progress.
Colloquium on Measurements, Modelling and Imaging for NonDestructive Testing, London (United Kingdom), 27 Mar. 1991. pp, 6/1-6/6. lEE (1991) Digest No. 1991/054 Production processes can be probed non-invasively using acoustic emission (AE) nondestructive testing. Complex pattern recognition techniques are needed to classify AE features and correlate them with changes in the process being monitored. This can be done using artificial neural networks (ANN) which have proved to he economic in terms of computer facilities and effective at classification of defects and AE features extraction. How these ANN were developed is the subject of this article.
48306
Andreikiv, O.E.; Lisak, M.V.; Sergienko, O.M.; Skars'kii,
V.R. Acoustic emission in tests on materials in hydrogenous and corrosive media Soviet Materials Science, Vol. 26, No. 5, pp. 512-520 (Sep. -Oct. 1991) A review is presented of acoustic emission (AE) studies relating to cracking resistance parameter determination where the Specimen is in a corrosive medium. The technique has been usefully applied to processes occurring in hydrogen and corrosion cracking. Crack initiation can be identified using AE signals. Times between cracking steps can be predicted more accurately using AE than traditional methods. This technique can also be used to predict the working life of a sample. Failure in corrosive media cause AE signals from various sources. Further research is required on methods of identifying these AE signals. 48264 I n f r a r e d thermography monitors quality of critical welded
components Welding Journal, Vol. 70, No. 12, pp. 59-61 (Dec. 1991) Infrared thermo~tphy is used in the new system described here to monitor weld quality on small electrical components in real time and at high speed. The system is reliable, cost-effective and can reliably evaluate the strength of welds as well as separate good from bad components. Artificial intelligence contained in the shape and intensity of the thermogram is examined. The heat from the weld contains information related to the critical processes involved.
Anisimov, V.K. Possibility of continuous acoustic inspection of plate material
48047
structures Soviet Journal of Nondestructive Testing, Vol. 27, No. i, pp. 42-45 (Sep. 1991)
.914
NDT&E
International 1 9 9 4 V o l u m e 27, N u m b e r 4
Szyszko, S.; Payne, P.A. Artificial neural networks for feature extraction from acoustic emission signals
Yoshioka, T. Acoustic emission and vibration in the process of rolling contact fatigue (3rd report) (In Japanese)
47788
Journal of Japanese Society of Tribotogists, Vol. 36, No. 6, pp. ~ 451 (1990) Diagnosis of rolling bearing by time interval of abnormal signals 47515 Deva Raju, K.V.M.; Subba Rao, S.V.; Srinivasan, K.V., Annamalal, M. A real time t o k e n ring L A N for A E monitoring Progress in Acoustic Emission V. The 10th International Acoustic Emission Symposium, Senclai (Japan), 22-25 Oct. 1990. pp. 380-386. Edited by K. Yamaguchi, H. Takahashi and H. Niitsuma. The Japanese Society for Non-Destructive Inspection (1990) in this paper, a study has been made to find out whether a local network of computerdataacquisitionsystemscan acquirethe high frequencysignals from many sensors and process and co-ordinate among themselves to assess and indicate the status of the specimen under test. Simulation results have shown that a token ring local network can be used for real time monitoring of large structures using AE. Mean queue lengths at each station, mean token rotation time, bandwidth versus re-arming time curve obtained from simulation are summarized in the paper. 47506 Wood, B.R,4.; Flyrm, T.C.; Harris, R.W.; Noyes, L.M. C o m p a r i s o n s between various waveguides for three long term acoustic emission monitoring projects Progress in Acoustic Emission V. The 10th International Acoustic Emission Symposium, Sendal (Japan), 22-25 Oct. 1990. pp. 501-506. Edited by K. Yamaguchi, H. Takahashi and H. Niitsuma. The Japanese Society for Non-Destructive Inspection (1990) The CSIRO has become involved in three long term acoustic emission monitoring projects. The first involves a new Platformer pressure vessel operating in a refinery at temperatures up to 580C; the second is a new large Cryogneic storage tank operating at --40/sup/C; and the :hird is a fibre
Gandy, T.; Bailey, J. Reduce costs with acoustic emission cool-down monitoring
48807
Hydrocarbon Processing, Vol. 71, No. I, pp. 66-67 (Jan. 1992) Planned shutdown of nuclear reactors provides routine maintenance and time to inspect possible structural defects but is expensive and so must be minimized. This article describes how acoustic emission cool- down monitoring can he used to improve turnaround for such maintenance operations. The techniques provides 100% volumetric inspection of a reactor and related systems in a very short period. It also allows maintenance crews to concentrate their inspection and repair effort appropriately.
Brown, L.F.; Brown, R.H. Permanently mounted piezo film sensors for s t r u c t u r a l q u a n t i t a t i v e NDE
48625
Review of Progress in Quantitative Nondestructive Evaluation, La Jolla, California (United States), 15-20 Jul. 1990. Vol. 10A, pp. 853-859. Edited by D.O. Thompson, and D.E. Chimenti. Plenum Press (1991). ISBN 0-306-43903-4. Piezo film sensors have been successfully demonstrated for permanently mounted structural quantitative NDE. Their unique physical properties were shown to make them well suited for novel applications for ultrasonic, acoustic emission, and impact detection sensing which conventional sensor technologies are unable to address. Their broadband high-sensitivity properties and unique form factor will make them valuable for future in-service QNDE applications.
Two requirements for systems for continuous inspection of plate material structures are named, determination of the coordinates of fatigue cracks and detection of areas of corrosion wear. t:or solution of the first problem a new principle of construction of acoustic emission systems with combined channels is proposed. A variation of calculation of the probability of overlapping of signals is proposed. For solution of the second problem use of the dispersion properties of Lamb waves is proposed. Equations making it possible to theoretically determine the size of the wear area and the residual thickness of the plate are obtained. 47821 Michaels, KJ. O n - o r b i t m o n i t o r i n g of hypervelocity i m p a c t d a m a g e on space
structures NDE: The Next Decade and Beyond. 1990 ASNT Spring Conference, San Antonio, Texas (United States), 19-23 Mar. 1990. pp. 35-37. ASNT (1990) Large space structures used for manned activities are vulnerable to damage from orbital debris and impacts from hypervelocity particles in space. To ensure structure integrity and crew safety, various nondestructive inspection methods are assessed. Their aim is to detect beyond some threshold level, where and when damage occurs and to assess its seriousness. Limitations include weight restrictions, available space, limited computer time and long term system reliability. Two promising methods emerged for monitoring hypervelocity particle impact, thin film kynar sensors on the inside of shield surfaces, and acoustic emission sensing, both using piezo film technology. This cheap flexible, lightweight tough polymer film offers many desirable sensor characteristics such as wide frequency and dynamic ranges, low acoustic impedance and high voltage output, strength and chemical and temperature stability.
48308
Hutton, D. V. A non-contact acoustic emission sensing system for rotatingc u t t e r machining processes
47792
Proceedings o f the 1990 SEM Spring Conference on Experimental Mechanics, Albuquerque, New Mexico (United States), 4-6 Jun. 1990. pp. 551-557. Society for Experimental Mechanics (1990) Continuing development of an acoustic emission sensing system for monitoring rotating cutter machining processes is discussed. The path for transmission of acoustic emission signals is a fluid located between the rotating spindle of a machine tool and a piezoelectric transducer. The objective of this arrangement is to eliminate to the extent possible other AE sources and signal distorting elements such as bearings from the signal transmission path. Success with a prototype system has shown the feasibility of the approach. A second design for a larger machine tool has been evaluated and this has led to a third generation design which is in progress.
Colloquium on Measurements, Modelling and Imaging for NonDestructive Testing, London (United Kingdom), 27 Mar. 1991. pp, 6/1-6/6. lEE (1991) Digest No. 1991/054 Production processes can be probed non-invasively using acoustic emission (AE) nondestructive testing. Complex pattern recognition techniques are needed to classify AE features and correlate them with changes in the process being monitored. This can be done using artificial neural networks (ANN) which have proved to he economic in terms of computer facilities and effective at classification of defects and AE features extraction. How these ANN were developed is the subject of this article.
48306
Andreikiv, O.E.; Lisak, M.V.; Sergienko, O.M.; Skars'kii,
V.R. Acoustic emission in tests on materials in hydrogenous and corrosive media Soviet Materials Science, Vol. 26, No. 5, pp. 512-520 (Sep. -Oct. 1991) A review is presented of acoustic emission (AE) studies relating to cracking resistance parameter determination where the Specimen is in a corrosive medium. The technique has been usefully applied to processes occurring in hydrogen and corrosion cracking. Crack initiation can be identified using AE signals. Times between cracking steps can be predicted more accurately using AE than traditional methods. This technique can also be used to predict the working life of a sample. Failure in corrosive media cause AE signals from various sources. Further research is required on methods of identifying these AE signals. 48264 I n f r a r e d thermography monitors quality of critical welded
components Welding Journal, Vol. 70, No. 12, pp. 59-61 (Dec. 1991) Infrared thermo~tphy is used in the new system described here to monitor weld quality on small electrical components in real time and at high speed. The system is reliable, cost-effective and can reliably evaluate the strength of welds as well as separate good from bad components. Artificial intelligence contained in the shape and intensity of the thermogram is examined. The heat from the weld contains information related to the critical processes involved.
Anisimov, V.K. Possibility of continuous acoustic inspection of plate material
48047
structures Soviet Journal of Nondestructive Testing, Vol. 27, No. i, pp. 42-45 (Sep. 1991)
.914
NDT&E
International 1 9 9 4 V o l u m e 27, N u m b e r 4
Szyszko, S.; Payne, P.A. Artificial neural networks for feature extraction from acoustic emission signals
Yoshioka, T. Acoustic emission and vibration in the process of rolling contact fatigue (3rd report) (In Japanese)
47788
Journal of Japanese Society of Tribotogists, Vol. 36, No. 6, pp. ~ 451 (1990) Diagnosis of rolling bearing by time interval of abnormal signals 47515 Deva Raju, K.V.M.; Subba Rao, S.V.; Srinivasan, K.V., Annamalal, M. A real time t o k e n ring L A N for A E monitoring Progress in Acoustic Emission V. The 10th International Acoustic Emission Symposium, Senclai (Japan), 22-25 Oct. 1990. pp. 380-386. Edited by K. Yamaguchi, H. Takahashi and H. Niitsuma. The Japanese Society for Non-Destructive Inspection (1990) in this paper, a study has been made to find out whether a local network of computerdataacquisitionsystemscan acquirethe high frequencysignals from many sensors and process and co-ordinate among themselves to assess and indicate the status of the specimen under test. Simulation results have shown that a token ring local network can be used for real time monitoring of large structures using AE. Mean queue lengths at each station, mean token rotation time, bandwidth versus re-arming time curve obtained from simulation are summarized in the paper. 47506 Wood, B.R,4.; Flyrm, T.C.; Harris, R.W.; Noyes, L.M. C o m p a r i s o n s between various waveguides for three long term acoustic emission monitoring projects Progress in Acoustic Emission V. The 10th International Acoustic Emission Symposium, Sendal (Japan), 22-25 Oct. 1990. pp. 501-506. Edited by K. Yamaguchi, H. Takahashi and H. Niitsuma. The Japanese Society for Non-Destructive Inspection (1990) The CSIRO has become involved in three long term acoustic emission monitoring projects. The first involves a new Platformer pressure vessel operating in a refinery at temperatures up to 580C; the second is a new large Cryogneic storage tank operating at --40/sup/C; and the :hird is a fibre