1,721,006 research outputs found
Damage Tolerant Active Control: Concept And State Of Art
No full textDamage tolerant active control is a new research area related to fault tolerant control design methods applied to mechanical structures. It encompasses several techniques commonly used to design active vibration controllers and to detect and diagnose faults, as well to monitor structural integrity. Brief reviews of the common intersections of these areas are presented, with the purpose to clarify their interrelations and also to justify the new controller design paradigm. Some examples help to better understand the role of the new area. © 2012 IFAC.8PART 16371Int. Fed. Autom. Control Tech. Comm. Fault Detect.,,Superv. Saf. Tech. Process.,IFAC Tech. Comm. Model., Identif. Signal Process. (TC 1.1),IFAC Technical Committee on Mechatronic Systems (TC 4.2),IFAC Technical Committee on Chemical Process,Control (TC 6.1)Balageas, D., Fritzen, C.P., Güemes, A., (2006) Structural Health Monitoring, , ed. ISTE, LondonBasseville, M., Mevel, L., Goursat, M., Statistical model-based damage detection and localization: Subspace-based residuals and damage-to-noise sensitivity ratios (2004) Journal of Sound and Vibration, 275, pp. 769-794Carden, E.P., Fanning, P., Vibration based based condition monitoring: A review (2004) Structural Health Monitoring JournalChang, F.-K., Structural health monitoring: Condition-based maintenance (2011) 8th International Workshop on Structural Health Monitoring (IWSHM), , Stanford, 2011Doebling, S.W., Farrar, C.R., Prime, M.B., A summary review of vibration-based damage identification methods (1998) The Shock and Vibration Digest, 30 (2), pp. 91-105Farrar, C.R., (2007) LA-14353 Nonlinear System Identification for Damage Detection, , Los Alamos National Laboratory. Los AlamosFassois, S.D., Sakellariou, J.S., (2009) Statistical Time Series Methods for SHM, , Chichester, UK: John Wiley and Sons LtdFritzen, C.P., Jennewein, D., Kiefer, T., Damage detection based on model updating methods (1998) Mechanical Systems and Signal Processing, 12 (1), pp. 163-186Fritzen, C.P., Kraemer, P., Self-diagnosis of smart structures based on dynamical properties (2009) Mechanical Systems and Signal Processing, 23, pp. 1830-1845Hajrya, R., Mechbal, N., Vergé, M., Damage detection of composite structure using independent component analysis (2011) International Workshop on Structural Health Monitoring, , IWSHM. Stanford, 2011Hajrya, R., Mechbal, N., Vergé, M., Proper orthogonal decomposition applied to structural health monitoring (2011) IEEE International Conference on Communications Computing and Control Applications, , Hammamet, 2011Inman, D.J., Farrar, C.R., Lopes Junior, V., (2005) Damage Prognosis: For Aerospace, Civil and Mechanical Systems, , Wiley edInocente-Junior, N.R., Nóbrega, E.G.O., Mechbal, N., Realtime structural health monitoring using parity residue analysis (2009) International Congress of Mechanical Engineering, , Brasil, 2009Liu, Y., Mechbal, N., Vergé, M., Damage monitoring based on wave illumination of structures (2011) International Workshop on Structural Health Monitoring (IWSHM), , Stanford, USA, 2011Mechbal, N., Vergé, M., Active robust fault estimation on a composite beam with integrated piezoceramics (2006) SAFEPROCESS'06, , Beijing, 2006Roseiro, L., Ramos, U., Leal, R., Neural networks in damage detection of composite laminated (2005) WSEAS Transactions on Systems, 4 (4), pp. 430-434Rytter, A., (1993) Vibration Based Inspection of Civil Engineering StructuRes., , PhD thesis. Aalborg UniversitySaeed, K., Mechbal, N., Coffignal, G., Vergé, M., Artificial neural network based structural damage diagnosis using nonparametric subspace residual (2009) 7th International Workshop on Structural Health Monitoring, IWSHM., , Stanford (USA), 2009Saeed, K., Mechbal, N., Coffignal, G., Vergé, M., Structural damage diagnosis Using Subspace based residual and artificial neural networks (2009) 7th IFAC, SAFEPROCESS, , Barcelona (Spain), 2009Saeed, K., Mechbal, N., Coffignal, G., Vergé, M., Subspace-based damage localization using artificial neural network (2010) 18th Mediterranean Conference on Control & Automation (MED'10), , Marrackech (Morroco), June 2010Sohn, H., Review of structural health monitoring literature, 1996-2001 (2003) Los Alamos National Laboratory Report. 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Elec, , SystChapuis, B., (2010) Contrôle Santé Intégré par Méthode Ultrasonore des Réparations Composites Collées sur des Structures Métalliques, , PhD Thesis. Paris: Univ. of Paris 7-ONERAChomette, B., Chesné, S., Remond, D., Gaudiller, L., Damage reduction of on-board structures using piezoelectric components and active modal control - Application to a printed circuit board (2010) Mechanical Systems and Signal Processing, 24 (2), pp. 352-354Chomette, B., Remond, D., Chesné, S., Gaudiller, L., Semiadaptive modal control of on-board electronic boards using an identification method (2008) Smart Material and Structures, 17, p. 18Fanson, L., Caughey, T.K., Positive position feedbackcontrol for large space structures (1990) AIAA Journal, 28 (4), pp. 717-724Gaudiller, L., Matichard, F., A nonlinear method for improving the active control efficiency of smart structures subjected to rigid body motions (2007) IEEE/ ASME Transaction of Mechatronics, pp. 542-548Gawronski, W., (2004) Advanced Structural Dynamics and Active Control of StructuRes., , Springer-VerlagHalim, D., Structural vibration control with spatially varied disturbance input using a spatial method (2007) Mechanical Systems and Signal Processing, 21 (6), pp. 2496-2514Halim, D., Barrault, G., Cazzolato, B.S., Active control experiments on a panel structure using a spatially weighted objective method with multiple sensors (2008) Journal of Sound and Vibration, 315 (1), pp. 1-21Hurlebaus, S., Stöbener, U., Gaul, L., Vibration reduction of curved panels by active modal control (2008) Computers & StructuRes., , p.251-257Inman, D., (2006) Vibration with Control, , ed. John Wiley & SonsJalili, N., Olgac, N., Multiple delayed resonator vibration absorbers for multi-degree-of- freedom mechanical structures (1999) Journal of Sound and Vibration, , 223, p.567-585Mazoni, A.F., Serpa, A.L., Nóbrega, E.G.O., A decentralized and spatial approach to the robust vibration control of structures (2011) Challenges and Paradigms in Applied Robust Control, pp. 149-170Mechbal, N., Coffignal, G.M.V., Ganapathi, Application of a combined active control and fault detection scheme to an active composite flexible structure (2006) International Journal of MechatronicsMoheiman, I.R.S.O., Vautier, B.J.G., Bhikkaji, B., Experimental implementation of extended multivariable PPF control on an active structure (2006) IEEE Transaction on Control System Technology, pp. 443-445. , MayPetersen, I.R., Pota, H.R., Minimax LQG optimal control of a flexible beam (2003) Control Engineering Practice, pp. 1273-1287. , NovemberPochiraju, K.V., Tandon, G.P., Schoeppner, G.A., (2012) Long-term Durability of Polymeric Matrix Composites, , SpringerPreumont, A., (2002) Vibration Control of Active Structures, an Introduction, , Kluwer, second editionSingh, S.P., Pruth, I.H.S., Agarwal, V.P., Efficient modal control strategies for active control of vibration (2003) Journal of Sound and Vibration, 262, pp. 563-575Singhose, W.E., Porter, L.J., Tuttle, T.D., Singer, N.C., Vibration reduction using multi-hump input shapers (1997) J. 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Prentice HallBelcastro, C.M., Application of fault detection, identification and accommodation methods for improved aircraft safety (2001) American Control Conference, ACC, , 2001Blanke, M., Kinnaert, M., Lunze, J., Staroswiecki, M., (2006) Diagnosis and Fault-tolerant Control., , Springer, Berlin (Germany)Blanke, M., Staroswiecki, M., Wu, N.E., Concepts and methods in fault-tolerant control (2001) American Control Conference, , ACC, 2001Chen, J., Patton, R.J., (1999) Robust Model-based Fault Diagnosis for Dynamic Systems, , Kluwer Academic PublishersChizeck, H.J., Willsky, A.S., Towards fault-tolerant optimal control (1978) IEEE Conference on Decision and Control, , 1978Cieslak, J., Henry, D., Zolghadri, A., Development of an active fault tolerant flight control strategy (2008) Journal of Guidance, Control, and DynamicsDing, S.X., Integrated design of control structures and embedded diagnosis (2009) Semi-plenary Talk in 7th IFAC Syposium SAFEPROCESS, , Barcelona, 2009Eterno, J.S., Weiss, J.L., Looze, D.P., Willsky, A.S., Design issues for fault tolerant-restructurable aircraft control (1985) IEEE Conference on Decision and Control, , 1985Hsieh, C.-S., Performance gain margins of the two-stage LQ reliable control (2002) Automatica, , p.1985-1990Isermann, R., Model-based fault-detection and diagnosis-status and applications (2005) Annual Reviews in Control, pp. 71-85Isermann, R., (2006) Fault-diagnosis Systems: An Introduction from Fault Detection to Fault Tolerance., , Springer ed. 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Improved Subspace-based Method Applied To Structural Damage Detection
No full textPrecise and automatic identification of structural properties is a vital step toward detection and localization of damage in structures. However, even simple structures may present a complex dynamical behavior, and a large number of poles for a given frequency interval. This complexity leads often to numerical problems, like spurious modes in the identified model. In this article it is proposed a novel frequency-windowed subspace identification method, suitable to perform reduced-order identification, using band-limited excitation. The proposed methodology is employed to identify natural frequencies and damage detection of an experimental bench. Experimental results show its effectiveness to improve model identification. It is also shown that the frequency-windowing subspace identification is able to enhance damage detection, by generating more accurate damage indexes. © 2012 IFAC.8PART 17277Int. Fed. Autom. Control Tech. Comm. Fault Detect.,,Superv. Saf. Tech. Process.,IFAC Tech. Comm. Model., Identif. Signal Process. (TC 1.1),IFAC Technical Committee on Mechatronic Systems (TC 4.2),IFAC Technical Committee on Chemical Process,Control (TC 6.1)Balageas, D., Fritzen, C.P., Güemes, A., (2006) Structural Health Monitoring, 496p. , London: ISTE, 2006Basseville, M., Benveniste, A., Goursat, M., Hermans, L., Mevel, L., Van Der Auwerauer, H., Output-only subspace-based structural identification: From theory to industrial testing (2001) Transactions of ASME, 123, pp. 668-676Basseville, M., Mevel, L., Goursat, M., Statistical model-based damage detection and localization: Subspace-based residuals and damage-to-noise sensitivity ratios (2004) Journal of Sound and Vibration, 275, pp. 769-794Chang, F.-K., Structural health monitoring: Condition-based maintenance (2011) Proceedings of 8 th International Workshop on Structural Health Monitoring, , Stanford, USAEwins, D.J., (2000) Modal Testing: Theory, Practice and Application, , Research Studies Press ltd, PhiladelphiaFritzen, C.P., Kraemer, P., Self-diagnosis of smart structures based on dynamical properties (2009) Mechanical Systems and Signal Processing, 23, pp. 1830-1845Inocente-Junior, N.R., Nóbrega, E.G.O., Mechbal, N., Realtime structural health monitoring using parity residue analysis (2009) International Congress of Mechanical Engineering, , Gramado, RS, BrasilJuang, J.-N., (1994) Applied System Identification, , Prentice Hall, New JerseyKatayama, T., (2005) Subspace Methods for System Identification: A Realization Approach, , (Communications and control engineering). Springer-Verlag, LondonMcKelvey, T., Akçay, H., Ljung, L., Subspace-based multivariable system identification from frequency response data (1996) IEEE Trans on Automatic Control, 41, pp. 960-978Mercère, G., Lecoeuche, S., Lovera, M., Recursive subspace identification based on instrumental variable unconstrained quadratic optimization (2004) Int J Adapt Control Signal Process, 18 (9-10), pp. 771-797Peeters, B., De Roeck, G., Reference-based stochastic subspace identification for output-only modal analysis (1999) Mech Sys Sig Proc, 13 (6), pp. 855-878Saeed, K., Mechbal, N., Coffignal, G., Vergé, M., Subspace-based damage localization using artificial neural network 18th mediterranean conference on control and automation (2010) MED'10 - Conference Proceedings, pp. 563-568Sohn, H., Farrar, C.R., Hemez, F.M., Czarnecki, J.J., Shunk, D.D., Stinemates, D.W., Nadler, B.R.A., Review of structural health monitoring literature: 1996-2001 (2003) Los Alamos National Laboratory Report, LA-13976-MSSu, Z.Q., Ye, L., (2009) Identification of Damage Using Lamb Waves, , SpringerVan Der Auweraer, H., Leurs, W., Mas, P., Hermans, L., Modal parameter estimation from inconsistent data sets (2000) Proc Int ModalVan Overschee, P., De Moor, B., (1996) Subspace Identification for Linear Systems, , Kluwer Academic Press, BostonWorden, K., Dulieu-Barton, J.M., An overview of intelligent fault detection in systems and structures (2004) Structural Health Monitoring, 3 (1), pp. 85-98Worden, K., Farrar, C.R., Manson, G., Park, G., The fundamental axioms of structural health monitoring (2007) Proc. R. Soc. A, 463, pp. 1639-166
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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