uu.seUppsala University Publications
Change search
Link to record
Permanent link

Direct link
BETA
Stepinski, Tadeusz
Alternative names
Publications (10 of 70) Show all publications
Dworakowski, Z., Ambrozinski, L., Packo, P., Dragan, K., Stepinski, T. & Uhl, T. (2014). Application of artificial neural networks for damage indices classification with the use of Lamb waves for the aerospace structures. Key Engineering Materials, 588, 12-21
Open this publication in new window or tab >>Application of artificial neural networks for damage indices classification with the use of Lamb waves for the aerospace structures
Show others...
2014 (English)In: Key Engineering Materials, ISSN 1013-9826, E-ISSN 1662-9795, Vol. 588, p. 12-21Article in journal (Refereed) Published
Abstract [en]

Lamb waves (LW) are used for damage detection and health monitoring due to the long range propagation ability and sensitivity to structural integrity changes as well as their robustness in different applications. However, due to the dispersive character and multimode nature of LWs, analysis of the acquired ultrasonic signals is very complex. It becomes even more difficult when applied to a complex structure, for instance, an aircraft component with riveted joints and stringers characterized by difficult geometries. Therefore, numerous approaches to the evaluation of damage indices have been proposed in the literature. In this paper, comparison a number of damage indices applied to LWs testing in aircraft aluminum panels. The damage indices, known from the literature have been selected from the application point of view. Artificial neural network has been used for the classification of fatigue cracks and artificial damages induced in the specimens taken from a real aircraft structure. Article presents results of simulation, data analysis and data classification obtained using selected and dedicated neural network. The main aim of the presented research was to develop signal processing and signal classification methods for an aircraft health monitoring system. The article presents a part of the research carried out in the project named SYMOST.

National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-214507 (URN)10.4028/www.scientific.net/KEM.588.12 (DOI)
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2017-12-06Bibliographically approved
Dragan, K., Dziendzikowski, M., Uhl, T. & Stepinski, T. (2014). Remote monitoring of fatigue cracks growth in the aircraft structure based on active piezosensor network during the full scale fatigue test. Key Engineering Materials, 588, 249-256
Open this publication in new window or tab >>Remote monitoring of fatigue cracks growth in the aircraft structure based on active piezosensor network during the full scale fatigue test
2014 (English)In: Key Engineering Materials, ISSN 1013-9826, E-ISSN 1662-9795, Vol. 588, p. 249-256Article in journal (Refereed) Published
Abstract [en]

One of the major issues from a structural integrity point of view of the aircraft structure is an appropriate health monitoring technology delivery for the damage tolerant philosophy. This paper presents a development of a system for fatigue crack growth monitoring and early damage detection in the PZL 130 ORLIK TC II turbo-prop military trainer aft structure. The maintenance system of the aircraft shifts from the safe-life to the hard-time. The aircraft started Full Scale Fatigue Test (FSFT) which will continue up to 2013. In the article a built block approach for the system design, signal modeling, sensing and signal processing as well as damage detection is presented. Taking into the consideration a previous experience of AGH as well as AFIT, a network of PZT transducers was deployed in the aircraft structure hot-spots. The system components are: remote monitoring unit, signal analysis, graphical user interface, sensor self-diagnostic tools, and data classification model. Description of damage detection capabilities are delivered in the paper. In particular some issues concerning the proposed damage indices and its application to crack growth estimation models are discussed. Fishers Linear Discriminant is used as a method to obtain effective crack growth predictors and one of the self-diagnostic tools used in the system. The results of the data collected from specimen fatigue tests are delivered and cross-validation technique is used to evaluate a classification model based on the damage indices derived.

National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-214501 (URN)10.4028/www.scientific.net/KEM.588.249 (DOI)
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2017-12-06Bibliographically approved
Stepinski, T., Uhl, T. & Staszewski, W. (2013). Advanced Structural Damage Detection: From Theory to Engineering Applications. John Wiley & Sons
Open this publication in new window or tab >>Advanced Structural Damage Detection: From Theory to Engineering Applications
2013 (English)Book (Refereed)
Place, publisher, year, edition, pages
John Wiley & Sons, 2013. p. 328
National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-214491 (URN)
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2014-01-08
Stepinski, T., Ambrozinski, L. & Uhl, T. (2013). Beamforming of Lamb waves using 2D arrays: A comparative study. In: Fu-Kuo Chang (Ed.), : . Paper presented at Proceedings of the 9th International Workshop on SHM, Stanford University, CA, USA (pp. 2210-2217). , sept
Open this publication in new window or tab >>Beamforming of Lamb waves using 2D arrays: A comparative study
2013 (English)In: / [ed] Fu-Kuo Chang, 2013, Vol. sept, p. 2210-2217Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-214516 (URN)
Conference
Proceedings of the 9th International Workshop on SHM, Stanford University, CA, USA
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2014-01-08
Stepinski, T., Ambrozinski, L. & Uhl, T. (2013). Designing 2D arrays for SHM of planar structures: a review. In: Proceeding of SPIE, vol 8694: . Paper presented at Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security. San Diego, CA, USA. (pp. 86941R).
Open this publication in new window or tab >>Designing 2D arrays for SHM of planar structures: a review
2013 (English)In: Proceeding of SPIE, vol 8694, 2013, p. 86941R-Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-214525 (URN)
Conference
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security. San Diego, CA, USA.
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2014-01-08
Manka, M., Rosiek, M., Martowicz, A., Stepinski, T. & Uhl, T. (2013). Lamb wave transducers made of piezoelectric macro-fibre composite. Structural Control and Health Monitoring: The Bulletin of ACS, 20(8), 1138-1158
Open this publication in new window or tab >>Lamb wave transducers made of piezoelectric macro-fibre composite
Show others...
2013 (English)In: Structural Control and Health Monitoring: The Bulletin of ACS, ISSN 1545-2255, E-ISSN 1545-2263, Vol. 20, no 8, p. 1138-1158Article in journal (Refereed) Published
Abstract [en]

During recent years, an intensive research activity concerning the application of Lamb waves (LWs) for SHM has been observed. LWs may be generated and sensed using different types of transducers, and their selection is essential for the SHM system's performance. Results of the investigation of three types of transducers based on macro-fiber composite (MFC) are presented in this paper; two types of commercially available MFC actuators are compared with a novel type of custom-designed interdigital transducer also based on the MFC substrate. After a short presentation of the piezoelectric transducer designed for SHM applications, details concerning the proposed interdigital transducer design are provided. Beampatterns of the investigated transducers are first compared using numerical FEM simulations, and next, the numerically obtained beampatterns are verified experimentally using laser vibrometry. In the final part of this paper, advantages and disadvantages of the investigated transducers are discussed.

Place, publisher, year, edition, pages
John Wiley & Sons, 2013
Keywords
structural health monitoring, Lamb waves, piezoelectric transducers, interdigital transducers, macro-fiber composites
National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-183086 (URN)10.1002/stc.1523 (DOI)000325888700003 ()
Available from: 2012-10-22 Created: 2012-10-22 Last updated: 2017-12-07Bibliographically approved
Manka, M., Rosiek, M., Martowicz, A., Ambrozinski, L., Uhl, T. & Stepinski, T. (2013). Novel method for simulation of Lamb wave propagation generated by an interdigital transducer. In: Fu-Kuo Chang (Ed.), : . Paper presented at Proceedings of the 9th International Workshop on SHM, Stanford University, CA, USA (pp. 2488-2495). , sept
Open this publication in new window or tab >>Novel method for simulation of Lamb wave propagation generated by an interdigital transducer
Show others...
2013 (English)In: / [ed] Fu-Kuo Chang, 2013, Vol. sept, p. 2488-2495Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-214509 (URN)
Conference
Proceedings of the 9th International Workshop on SHM, Stanford University, CA, USA
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2014-01-08
Ambrozinski, L., Magda, P., Dragan, K., Stepinski, T. & Uhl, T. (2013). Temperature compensation based on Hilbert transform and instantaneous phase for Lamb waves-based SHM systems of aircraft structures. In: Fu-Kuo Chang (Ed.), Proceedings of the 9th International Workshop on Structural Heath Monitoring 2013: . Paper presented at 9th International Workshop on Structural Health Monitoring, Stanford University, CA, USA (pp. 1259-1266). , sept
Open this publication in new window or tab >>Temperature compensation based on Hilbert transform and instantaneous phase for Lamb waves-based SHM systems of aircraft structures
Show others...
2013 (English)In: Proceedings of the 9th International Workshop on Structural Heath Monitoring 2013 / [ed] Fu-Kuo Chang, 2013, Vol. sept, p. 1259-1266Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-214520 (URN)
Conference
9th International Workshop on Structural Health Monitoring, Stanford University, CA, USA
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2014-03-06Bibliographically approved
Ambrozinski, L., Piwakowski, B., Stepinski, T. & Uhl, T. (2012). Application of air-coupled ultrasonic transducers for damage assessment of composite panels. In: 6th European Workshop on Structural Health Monitoring, Dresden, Tyskland. Paper presented at 6th European Workshop on Structural Health Monitoring, Dresden, Tyskland.
Open this publication in new window or tab >>Application of air-coupled ultrasonic transducers for damage assessment of composite panels
2012 (English)In: 6th European Workshop on Structural Health Monitoring, Dresden, Tyskland, 2012Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-183090 (URN)
Conference
6th European Workshop on Structural Health Monitoring, Dresden, Tyskland
Available from: 2012-10-22 Created: 2012-10-22 Last updated: 2012-10-22
Ambrozinski, L., Stepinski, T. & Uhl, T. (2012). Design of 2D phased array for monitoring isotropic plate-like structures using Lamb waves. In: 6th European Workshop on Structural Health Monitoring, Dresden, Tyskland. Paper presented at 6th European Workshop on Structural Health Monitoring, Dresden, Tyskland.
Open this publication in new window or tab >>Design of 2D phased array for monitoring isotropic plate-like structures using Lamb waves
2012 (English)In: 6th European Workshop on Structural Health Monitoring, Dresden, Tyskland, 2012Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
urn:nbn:se:uu:diva-183089 (URN)
Conference
6th European Workshop on Structural Health Monitoring, Dresden, Tyskland
Available from: 2012-10-22 Created: 2012-10-22 Last updated: 2012-10-22
Organisations

Search in DiVA

Show all publications