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Wyświetlanie 1-15 z 76
Tytuł:
Dynamic load identification for structural health monitoring
Autorzy:
Jankowski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/31343114.pdf
Data publikacji:
2013
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
structural health monitoring
dynamic load
monitorowanie stanu technicznego konstrukcji
obciążenia dynamiczne
identyfikacja wymuszeń dynamicznych
Opis:
This book deals with the inverse problem of identification of dynamic loads and its applications for low frequency structural health monitoring (SHM). It collects and unifies the work performed by the author within the framework of three research projects either alone or together with the three Ph.D. students under his supervision or co-supervision. In particular: - The inverse linear problem of load identification is discussed in the practically important case of limited instrumentation. Various techniques for augmenting the missing information are described together with three complementary quantitative measures of optimum sensor placement. - A method for identification of dynamic loads in elastoplastic structures is developed, including sensitivity analysis of the response and gradient-based optimization. - The general methodology of the virtual distortion method (VDM) is used to represent various SHM problems in terms of a load identification problem. This includes - A methodology for virtual isolation of substructures for the purpose of local SHM. - A model-free (nonparametric and based on purely experimental data) methodology for identification of structural damages, modifications and inelastic impacts. - A unified approach to the problem of simultaneous identification of unknown excitations and structural damages. All presented approaches are tested and illustrated in numerical examples that use a realistic numerical noise level of at least 5% rms. Depending on laboratory constraints, experimental verification is performed in selected cases.
Źródło:
IPPT Reports on Fundamental Technological Research; 2013, 2; 1-280
2299-3657
Pojawia się w:
IPPT Reports on Fundamental Technological Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wireless Communication Solution for Distributed Structural Health Monitoring
Autorzy:
Andrzejczak, A.
Łęczycki, P.
Makowski, M.
Pękosławski, B.
Pietrzak, P.
Napieralski, A.
Powiązania:
https://bibliotekanauki.pl/articles/226561.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wireless sensor networks
IEEE 802.15.4
Bluetooth Low Energy
DASH7
IEEE 802.11n
ZigBee
weightless
structural health monitoring
Opis:
This paper describes a design of wireless distributed SHM (Structure Health Monitoring) system with a particular emphasis on comparison of wireless communication standards. The presented solution is being deployed in the TULCOEMPA project. Several wireless communication standards are compared, with their benefits, disadvantages and typical areas of application. A choice of proper ISM (Industrial Scientific Medical) band and reasons for use of Wireless Sensor Networks are also discussed. The last part of this paper presents the proposed structure and designed prototype. The chosen architecture of the system and the program algorithm used for communication and measurements are described.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 2; 177-184
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Health Monitoring Approach to the Aerospace Structures
Autorzy:
Dragan, K.
Powiązania:
https://bibliotekanauki.pl/articles/97815.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Opis:
In the article only selected information regarding the SHM applications has been presented. These applications are associated with damage detection and damage growth monitoring. That approach has got crucial influence on the aircraft maintenance procedures. SHM ensures higher reliability and safety of the structures as well as repair monitoring. Right now in the AFIT, there is being conducted research work focused on the application of the SHM system for the integration with the aerospace structures for periodical and on-line monitoring.
Źródło:
Fatigue of Aircraft Structures; 2010, 2; 14-18
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed sensor placement optimization for computer aided structural health monitoring
Autorzy:
Ameduri, Salvatore
Ciminello, Monica
Dimino, Ignazio
Concilio, Antonio
Catignani, Alfonso
Mancinelli, Raimondo
Powiązania:
https://bibliotekanauki.pl/articles/140025.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Structural Health Monitoring
SHM
fiber optic
genetic optimization
strain energy
monitoring strukturalny
światłowód
optymalizacja genetyczna
energia odkształcenia sprężystego
Opis:
An optimal sensor placement methodology is implemented and herein proposed for SHM model-assisted design and analysis purposes. The kernel of this approach analysis is a genetic-based algorithm providing the sensor network layout by optimizing the probability of detection (PoD) function while, in this preliminary phase, a classic strain energy approach is adopted as well established damage detection criteria. The layout of the sensor network is assessed with respect to its own capability of detection, parameterized through the PoD. A distributed fiber optic strain sensor is adopted in order to get dense information of the structural strain field. The overall methodology includes an original user-friendly graphical interface (GUI) that reduces the time-to-design costs needs. The proposed methodology is preliminarily validated for isotropic and anisotropic elements.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 1; 111-127
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Guided waves in ship structural health monitoring – a feasibility study
Autorzy:
Roch, Emil
Zima, Beata
Woloszyk, Krzysztof
Garbatov, Yordan
Powiązania:
https://bibliotekanauki.pl/articles/32921251.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
corrosion
guided waves
non-destructive testing
ship structure
Opis:
Ships and offshore structures operate in a severe corrosion degradation environment and face difficulty in providing longlasting corrosion protection. The Classification Societies recommend regular thickness measurements leading to structural component replacements, to ensure structural integrity during service life. The measurements are usually performed using ultrasonic thickness gauges and such an approach requires multiple measurements of the corroded structural components. Otherwise, the collected data are insufficient to precisely assess the corrosion degradation level. This study aims to perform numerical and experimental analyses to verify the use of guided ultrasonic waves in defining the corrosion degradation level of the corroded structural components of a ship. The study incorporates the fundamental antisymmetric Lamb mode, excited by piezoelectric transducers attached at the pre-selected points on stiffened panels, representing typical structural ship components. The specimens are exposed to accelerated marine corrosion degradation, the influence of the degree of degradation on the wave time of flight being analysed. The study indicates that guided waves are a promising approach for diagnosing corroded structural components. The signals characterised by a high signal-to-noise ratio have been captured, even for relatively long distances between the transducers. This proves that the proposed approach can be suitable for monitoring more extensive areas of ship structures by employing a single measurement.
Źródło:
Polish Maritime Research; 2023, 2; 76-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The stress analysis effect on structural health monitoring in functionally graded shell
Autorzy:
Madeh, Ahmed Raee
Abd-Ali, Nabel Kadum
Powiązania:
https://bibliotekanauki.pl/articles/2096204.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
health monitoring
FG shell
power law
sigmoidal law
virtual energy method
thickness ratio
monitorowanie konstrukcji
prawo energetyczne
prawo sigmoidalne
Opis:
The common damage in engineering structures, especially in functionally graded materials, such as failure resulting from fiber breaking or cracking in the matrix or deboning between fibers and matrix, as well as the delamination between the composite material plies and between its layers, may be due to thermal effects, vibration, load concentration as a result of stress and strain for provides information’s about structural health monitoring. Virtual energy method such as Hamilton's was used to investigate the effect of the design parameters such as side to thickness and modular as well as material graduation index ratio on the stress-strain relationships, displacement, resultants of stresses, and resultants of mid plane strain. The analysis and simulation of the FGM shells is done in this paper utilizing MATLAB19 code and ABAQUS20 programs. The distribution of characteristics across shell thickness had also been determined using a power law. Normal stress was varied gradually from 5.74 MPa to 9.55 MPa with material index (n) from 0 to 10 respectively, while shear stress varied from 4.2 to 8.23 MPa for the same value of (n). The strain percent increased slightly from 0.00059 to 0.0012 with displacement 0.22 and 1.2 respectively for the same value of (n).
Źródło:
Diagnostyka; 2022, 23, 3; art. no. 2022302
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of effect changing temperature on lamb-wave based structural health monitoring
Autorzy:
Mohammadi Esfarjani, Sattar
Powiązania:
https://bibliotekanauki.pl/articles/95329.pdf
Data publikacji:
2019
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
structural health monitoring
Lamb waves
temperature
AL2024-T3 sheet
AL1100 sheet
monitorowanie stanu konstrukcji
SHM
fale Lamba
temperatura
blacha aluminiowa
Opis:
The purpose of this paper is to investigate the effect of temperature change on the Lamb wave-based SHM method. This study evaluates the Lamb wave method’s ability to detect damage to an AL2024-T3 sheet, assessed by a near-surface hole. Lamb waves are created via numerical simulation with the commercial Finite Element (FE) package ABAQUS. In this study, the Lamb wave-based SHM method using displacement responses is used. The results indicate that this method is able to detect a near-surface hole in the AL2024-T3 sheet as well as its location, with close approximation. Subsequently, the AL1100 sheet was investigated for changes in temperature from this method, which was evaluated over a temperature range of –200°C to 204°C. The results show that temperature change in the range of –200°C to 93°C has no effect on the displacement responses. However, the graphs related to temperature change of more than 149°C do not overlap with the reference temperature. Hence, it has been concluded that Lamb waves can be used as an SHM method in the temperature range of –200°C to 93°C without having to worry about the effects of temperature change on the results.
Źródło:
Journal of Mechanical and Energy Engineering; 2019, 3, 4; 329-335
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Tests Applied to Structural Health Monitoring: An Overview of Previous Experience
Autorzy:
Baran, Marta
Nowakowski, Dominik
Lisiecki, Janusz
Kłysz, Sylwester
Powiązania:
https://bibliotekanauki.pl/articles/2105150.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
BVID
CFRP
composite damage
fatigue crack
SHM
Opis:
Laboratory for Materials Strength Testing (LMST) has been conducting accredited mechanical research for aviation from 2003. Among accredited procedures are e.g. low and high cycle fatigue tests, fracture toughness tests and fatigue crack growth rate tests. The main goal of them is obtaining materials constants and characteristics. However knowledge how to conduct these tests could be used also in other applications, for instance in the work on development of Structural Health Monitoring systems (SHM). When cracks propagate in a controlled way in laboratory conditions, it allows verifying the operation of a single sensor or a network of sensors. In this paper, an overview of mechanical tests carried out at the Laboratory for Materials Strength Testing within Air Force Institute of Technology (AFIT) work on research and development of SHM systems is presented. Specimens prepared from materials such as aluminum alloys (among other withdrawn PZL-130 Orlik TC-II aircraft) and CFRP composite were tested under different mechanical loads, i.e., cycle and impact loads. In the presented research, both constant amplitude and spectrum loads were applied.
Źródło:
Fatigue of Aircraft Structures; 2020, 12; 123--135
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wireless Energy Supply to Aircraft Structural Health Monitoring Nodes Using Ultrasonic Lamb Waves
Autorzy:
Kural, A.
Powiązania:
https://bibliotekanauki.pl/articles/97775.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
structural health monitoring
wireless ultrasonic energy transmission system
transmission transducers tests
Opis:
This article is based on research done during the author’s PhD at Cardiff University, UK. A prototype of a novel wireless energy transmission system aimed at the use with wireless aircraft structural health monitoring (SHM) sensor nodes is described. The system uses ultrasonic guided plate waves (Lamb waves) to transmit energy along an aluminium plate, similar to those used in aircraft structures. Three types of piezoelectric transducers generating and receiving the ultrasonic vibration were compared. The Smart Material MFC M8528-P1 was found to achieve the best performance, allowing the transmission of 17 mW across a 54 cm distance, while being driven with a 20 V signal. Laser vibrometer imaging and LISA software simulation of the Lamb wave propagation in the experimental plate were also performed. Based on these, ideas for a further development of the system were proposed.
Źródło:
Fatigue of Aircraft Structures; 2014, 6; 21-28
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systemy monitorowania konstrukcji sprężonych. Część 1
Structural health monitoring systems for prestressed structures
Autorzy:
Sieńko, R.
Howiacki, T.
Bednarski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/129446.pdf
Data publikacji:
2015
Wydawca:
PWB MEDIA Zdziebłowski
Tematy:
systemy monitorowania
konstrukcje sprężone
structural health monitoring
prestressed structures
Opis:
Technologię sprężania wykorzystuje się przede wszystkim w elementach o dużych rozpiętościach, przenoszących znaczne obciążenia, których konsekwencje zniszczenia byłyby bardzo duże. Dlatego istotne jest, aby proces projektowania, wznoszenia oraz późniejszej eksploatacji takich obiektów był odpowiednio kontrolowany.
Prestressing technology is primarily used for a large-span elements, carrying heavy loads, which failure consequences would be very substantial. Thus, it is essential to control adequately the process of designing, erecting and further operating of such kind of objects. Computational procedures, presented in the standards, allow for the safe design, but do not provide the full knowledge about structure’s work in its real conditions of use. This knowledge could be acquired by interpreting the results of measurements made by structural health monitoring systems. This article presents an overview of the most important ways to monitor the work of prestressed elements based on selected systems implemented in different types of objects in Poland.
Źródło:
Builder; 2015, 19, 8; 56-59
1896-0642
Pojawia się w:
Builder
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systemy monitorowania konstrukcji sprężonych. Część 2
Structural health monitoring systems for prestressed structures
Autorzy:
Sieńko, R.
Howiacki, T.
Bednarski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/129513.pdf
Data publikacji:
2015
Wydawca:
PWB MEDIA Zdziebłowski
Tematy:
systemy monitorowania
konstrukcje sprężone
structural health monitoring
prestressed structures
Opis:
Procedury obliczeniowe zamieszczone w normach pozwalają na bezpieczne projektowanie, jednak nie dostarczają pełnej wiedzy na temat pracy konstrukcji w rzeczywistych warunkach użytkowania. Taką wiedzę można pozyskać, interpretując wyniki pomiarów wykonanych za pomocą systemów monitorowania konstrukcji.
Prestressing technology is primarily used for a large-span elements, carrying heavy loads, which failure consequences would be very substantial. Thus, it is essential to control adequately the process of designing, erecting and further operating of such kind of objects. Computational procedures, presented in the standards, allow for the safe design, but do not provide the full knowledge about structure’s work in its real conditions of use. This knowledge could be acquired by interpreting the results of measurements made by structural health monitoring systems. This article presents an overview of the most important ways to monitor the work of prestressed elements based on selected systems implemented in different types of objects in Poland.
Źródło:
Builder; 2015, 19, 9; 76-79
1896-0642
Pojawia się w:
Builder
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer-aided prototyping of interdigital transducers for the structural health monitoring of planar structures
Autorzy:
Mańka, M.
Ambroziński, Ł.
Uhl, T.
Powiązania:
https://bibliotekanauki.pl/articles/368827.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Lamb wave
ultrasonic
numerical simulation
damage detection
structural health monitoring
SHM
fale Lamba
ultradźwięki
symulacje
wykrywanie uszkodzeń
monitorowanie stanu konstrukcji
Opis:
In recent years an intensive research activity into the application of guided waves (GWs) for structural health monitoring (SHM) can be observed. For instance, Lamb waves (LWs) have shown a great potential in monitoring of thin, planar structures. However, due to the dispersive and multimodal nature of the LWs, their snapshots can consist of many pulses even for an intact structure, which makes damage detection very complex. Moreover, small PZT transducers, most commonly used in SHM systems, act normally as omni-directional wave sources; therefore, dense or sparse transducers networks are required for damage localization. Some of the above-mentioned drawbacks of single PZT emitters and sensors can be overcome using interdigital transducers (IDT) designed to excite and sense a single, selected mode. The mode-tuning is performed by changing the span of finger electrodes to match the wavelength of the excited mode for the selected frequency. An IDT is a directional source, therefore, it generates a wave steered to the direction perpendicular to the electrodes. The width of the excited main lobe can be determined by the length of the electrodes. Since many parameters of the IDTs infl uence the LWs propagation, techniques for the simulation of the wave excitation and propagation are needed. In the paper, numerical tools for the computer aided design and virtual prototyping of the IDTs are presented. The simulation technique is based on the frequency-dependent transfer function of the structure, and due to its computational efficiency it can be used for fast testing of IDTs’ performance and for preliminary transducer design for further finite element simulations, and prototyping.
W ostatnich latach obserwowany jest gwałtowny rozwój technik monitorowania stanu konstrukcji (ang. SHM) opartych na metodach ultradźwiękowych. Jednym z typów fal, szczególnie przydatnych do monitorowania konstrukcji płytowych, są fale Lamba. Jednakże ich dyspersyjny i wielopostaciowy charakter powoduje, że proces detekcji uszkodzeń z ich zastosowaniem wymaga zastosowania zawansowanego przetwarzania sygnałów. Ponadto, typowe przetworniki PZT, generują falę wielokierunkową, co powoduje potrzebę stosowania wielu przetworników w celu lokalizacji uszkodzenia. Przetworniki międzypalczaste (ang. IDT) są wolne od niektórych, wspomnianych powyżej, wad przetworników PZT, gdyż są one projektowane do wzbudzania i wykrywania wybranych postaci drgań. Dostrajanie przetwornika do danej postaci drgań odbywa się przez zmianę rozstawu elektrod palczastych tak, aby odległość pomiędzy elektrodami podłączonymi do tej samej fazy odpowiadała długości fali w wybranej częstotliwości. Przetworniki IDT są źródłami kierunkowymi, fala jest generowana w kierunku prostopadłym do elektrod palczastych, a szerokość głównej wiązki może być sterowana poprzez długość elektrod. W artykule przedstawione zostały opracowane przez autorów narzędzia do komputerowego wspomagani projektowania i symulacji działania przetworników IDT oraz ich weryfi kacja eksperymentalna. Opracowane narzędzia symulacyjne, oparte na częstotliwościowo zależnej funkcji przejścia, jest bardzo wydajne obliczeniowo i pozwala na szybką identyfi kację właściwości.
Źródło:
Mechanics and Control; 2013, 32, 2; 69-76
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Approach to Structural Health Monitoring of Composite Structures Based on Embedded PZT Transducers
Autorzy:
Dziendzikowski, M.
Dragan, K.
Kurnyta, A.
Kornas, Ł.
Latoszek, A.
Zabłocka, M.
Kłysz, S.
Leski, A.
Chalimoniuk, M.
Giewoń, J.
Powiązania:
https://bibliotekanauki.pl/articles/97829.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
structural health monitoring
PZT sensor network
barely visible impact damages
Opis:
One approach to developing a system of continues automated monitoring of structural health is to use elastic waves excited in a given medium by a piezoelectric transducers network. Depending on their source and the geometry of the structure under consideration elastic waves can propagate over a significant distance. They are also sensitive to local structure discontinuities and deformations providing a tool for detecting local damage in large aerospace structures. This paper investigates the issue of Barely Visible Impact Damages (BVIDs) detection in composite materials. The model description and the results of impact tests verifying damage detection capabilities of the proposed signal characteristics are presented in the paper.
Źródło:
Fatigue of Aircraft Structures; 2014, 6; 113-118
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-contact structural health monitoring of rotating components
Bezdotykowe monitorowanie stanu technicznego wirujących elementów
Autorzy:
Witoś, M.
Zieja, M.
Powiązania:
https://bibliotekanauki.pl/articles/252590.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
rotating component
non-contact monitoring
element wirujący
monitorowanie bezdotykowe
Opis:
The article describes a class of diagnostics issues for rotating parts. An indirect method has been applied for the structural health monitoring of critical machine parts, which is based on the detection of the angular position of the rotating parts or defects and precise measurement of the time of their arrival, TOA. The variable reluctance sensor or generator stator is the fixed part of the specific encoder. The subject matter has been illustrated by means of examples.
Artykuł opisuje klasę zagadnień diagnostycznych dotyczących wirujących elementów. Do monitorowania ich stanu technicznego zastosowano pośrednią metodę, bazującą na detekcji położenia kątowego wirujących elementów lub defektów i precyzyjnym czasie pomiaru ich przybycia, TOA. Czujnik reluktancyjny lub stator prądnicy są składową specyficznego enkodera. Omawianą tematykę zobrazowano przykładami.
Źródło:
TTS Technika Transportu Szynowego; 2016, 12; 269-276
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
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