Temat: structural health monitoring - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Scalar and vector time series methods for vibration based damage diagnosis in a scale aircraft skeleton structure
Skalarne i wektorowe szeregi czasowe w diagnostyce uszkodzeń opartej na analizie drgań na przykładzie modelu szkieletu samolotu
Autorzy:: Kopsaftopoulos, F. P.
Fassois, S. D
Powiązania:: https://bibliotekanauki.pl/articles/279265.pdf
Data publikacji:: 2011
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: structural health monitoring (SHM)
damage detection
damage identification
Opis:: A comparative assessment of several scalar and vector statistical time series methods for vibration based Structural Health Monitoring (SHM) is presented via their application to a laboratory scale aircraft skeleton structure in which different damage scenarios correspond to the loosening of different bolts. A concise overview of scalar and vector methods, that is methods using scalar or vector signals, statistics, and corresponding models, is presented. The methods are further classified as nonparametric or parametric and response-only or excitation-response. The effectiveness of the methods for both damage detection and identification is assessed via various test cases corresponding to different damage scenarios. The results of the study reveal various facets of the methods and confirm the global damage diagnosis capability and the effectiveness of both scalar and vector statistical time series methods for SHM.
W pracy zawarto analizę porównawczą kilku skalarnych i wektorowych statystycznych szeregów czasowych stosowanych w technikach monitorowania stanu konstrukcji (SHM) na podstawie ich skuteczności w zastosowaniu do wykrywania uszkodzeń szkieletowej struktury laboratoryjnego modelu samolotu dla różnych scenariuszy uszkodzeń wywołanych poluzowaniem połączeń śrubowych. Zaprezentowano krótki przegląd skalarnych i wektorowych metod analizy, tj. bazujących na skalarnych i wektorowych sygnałach i statystykach, oraz odpowiadające im modele. Metody te sklasyfikowano jako nieparametryczne i parametryczne oraz oparte wyłącznie na informacji o odpowiedzi dynamicznej układu lub relacji pomiędzy wymuszeniem i odpowiedzią. Efektywność rozważanych metod oceniono na podstawie kilku eksperymentalnych przypadków badawczych odpowiadających różnym scenariuszom uszkodzeń modelu. Wyniki badań ujawniły różne aspekty zastosowanych technik analizy i potwierdziły przydatność skalarnych i wektorowych szeregów czasowych w diagnostyce i monitorowaniu stanu konstrukcji (SHM).
Źródło:: Journal of Theoretical and Applied Mechanics; 2011, 49, 3; 727-756
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Problems review of the health monitoring of tall type buildings
Autorzy:: Saidov, K.
Szpytko, J.
Powiązania:: https://bibliotekanauki.pl/articles/246502.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: structural health monitoring (SHM)
tall frame type buildings
automation
Opis:: Structural monitoring systems are widely adopted to monitor the behaviour of structures during forced vibration testing or natural excitation. Structural monitoring systems can be found in a number of common structures including aircrafts, ships, bridges, mechanical and civil structures. For example, some building design codes mandate that structures located in regions of high seismic activity have structural monitoring systems installed. This paper is focused on selected problems review of the health monitoring of tall type buildings and automation. The actual problem in structural health monitoring (SHM) is to find the structural damage and its location by performing some statistical pattern recognition on the measured data termed as feature extraction. The damage caused by environmental loads should be repaired; otherwise, it will expand with time and might lead to complete system failure. Dynamic parameters such as velocity, acceleration, and displacement play a significant role in determining the structure dynamics. As well as this paper highlights comprehensive survey about monitoring system used in civil structures (buildings) involving the issues such as influence of different outer forces on buildings and other critical methods for proper analysis of monitoring system used in tall type buildings. Additionally, wide-scale review related to an automation aspect of structural health monitoring of buildings has been presented. A significant observation from this review is that although there are many more SHM studies being reported, the investigators, in general, have not yet fully embraced the well-developed tools from statistical pattern recognition. As such, the discrimination procedures employed are often lacking the appropriate rigor necessary for this technology to evolve beyond demonstration problems carried out in laboratory setting.
Źródło:: Journal of KONES; 2015, 22, 2; 191-204
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Non-destructive methods into health monitoring of tall type buildings operating into hazardous environment
Autorzy:: Saidov, K.
Szpytko, J.
Powiązania:: https://bibliotekanauki.pl/articles/241693.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: structural health monitoring
smart wireless sensors
data analysis methods
Opis:: The paper is focusing on selected problems of health monitoring of tall type buildings. The actual problem in structural health monitoring (SHM) is to find the damages and its location by performing some statistical pattern recognition based on the measured data termed as feature extraction. The damage caused by environmental loads should be repaired; otherwise, it will expand with time and might lead to complete system failure. Dynamic parameters, such as velocity, acceleration and displacement, play a significant role in determining the structure dynamics. This paper is focusing on smart wireless sensors application into health monitoring systems of tall type buildings operating into hazardous environment and selected methods for data analysis obtained from the monitoring system. Smart sensors can locally process measured data and transmit only the significant information via wireless communication. As a network, wireless sensors extend the capability. Significant future developments of smart wireless sensors technology in tall type buildings in hazardous environment come by way of multi-disciplinary research efforts encompassing fields such as data analysing, signal processing, structural dynamics, motion and environmental sensing hardware, computational hardware, smart materials, data telemetry and statistical pattern recognition, as well as other fields yet to be defined. Specification issues that require automation of the decision making process in the evaluation of the technical state of the tall type structure have been also discussed.
Źródło:: Journal of KONES; 2014, 21, 4; 425-432
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effect of the multiple damages and temperature changes on the natural frequency
Autorzy:: Mohammadi Esfarjani, S.
Salehi, M.
Ghassemi, A.
Powiązania:: https://bibliotekanauki.pl/articles/279351.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: structural health monitoring
damage detection
vibration response
temperature
natural frequency
Opis:: Damage detection based on structural dynamic characteristics, such as natural frequencies and mode shapes, is an important area of research. Obtaining accurate structural dynamic characteristics is perhaps the most challenging aspect. In particular, changes in environmental temperature due to seasonal weather or radiation from sunshine leads to changes in the dynamic characteristics of structures. An important conclusion is that changes in the dynamic characteristics of a structure due to damage may be smaller than changes in the dynamic characteristics due to variations in temperature. Also, damage can affect the frequency response. This is the first study of evaluation of the effect of changes in temperature and multiple damages on natural frequency at the same time. In this paper, the simultaneous effect of the multiple defects and temperature on the natural frequencies of 6063 aluminum alloy beam are assessed numerically. ABAQUS finite element software is used for the numerical analysis. The present paper aims to evaluate the temperature effect and multiple damages on vibration responses. The variations in the frequency have been analysed in simulation by using an aluminum specimen and obtaining impedance signatures at temperatures ranging from −200◦C to 204◦C. The results show that an increase in temperature leads to a decrease in structural frequency, and that a decrease in temperature leads to an increase in structural frequency. The evaluation of the effect of multiple defects on natural frequency shows that when damages are created in the structure, there is a significant decrease in the natural frequency responses of the 6063 aluminum alloy beam. The results show that damage causes a decrease in the natural frequency of the structure. This study highlights the importance of applying simulation methods to the evaluation of the effect of changes in environmental temperature and multiple damages on the dynamic characteristics such as natural frequencies and mode shapes, especially at the same time.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 813-822
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Composite Aerospace Structure Monitoring with use of Integrated Sensors
Autorzy:: Dragan, K.
Dziendzikowski, M.
Kurnyta, A.
Salacinski, M.
Klysz, S.
Leski, A.
Powiązania:: https://bibliotekanauki.pl/articles/97867.pdf
Data publikacji:: 2015
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:: structural health monitoring
PZT sensor network
barely visible impact damages
Opis:: One major challenge confronting the aerospace industry today is to develop a reliable and universal Structural Health Monitoring (SHM) system allowing for direct aircraft inspections and maintenance costs reduction. SHM based on guided Lamb waves is an approach capable of addressing this issue and satisfying all the associated requirements. This paper presents an approach to monitoring damage growth in composite aerospace structures and early damage detection. The main component of the system is a piezoelectric transducers (PZT) network integrated with composites. This work describes sensors’ integration with the structure. In particular, some issues concerning the mathematical algorithms giving information about damage from the impact damage presence and its growth are discussed.
Źródło:: Fatigue of Aircraft Structures; 2015, 7; 12-17
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Mechatronics in diagnostics
Mechatronika w diagnostyce
Autorzy:: Uhl, T.
Powiązania:: https://bibliotekanauki.pl/articles/329648.pdf
Data publikacji:: 2008
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: mechatronika
diagnostyka
monitorowanie stanu konstrukcji
mechatronics
diagnostics
structural health monitoring
Opis:: This paper deals with current problems of diagnosing mechanical structures. The structural diagnostics have been presented as an interdisciplinary area integrating the fields of mechanics, electronics, computer science and materials engineering. The analogy between mechatronics and structural diagnostics will be discussed. The diagnostic methods contain three basic elements: measurements, including sensors designing and signal processing, procedures and diagnostic algorithms as well as structure properties prediction. The main issues within monitoring and structural diagnostics will be presented in the paper.
W pracy przedstawiono współczesna problematykę diagnozowania konstrukcji mechanicznych. Przedstawiono diagnostykę konstrukcji jako dziedzinę interdyscyplinarną, stanowiącą integrację mechaniki, elektroniki, informatyki i inżynierii materiałowej. Pokazana zostanie analogia pomiędzy mechatroniką, a diagnostyką konstrukcji. Metody diagnostyki zawierają trzy podstawowe elementy; pomiary, w tym konstrukcja czujników, przetwarzanie sygnałów; metody i algorytmy oraz przewidywanie własności konstrukcji. W ramach referatu przedstawione zostaną podstawowe problemy z dziedziny monitorowania i diagnostyki konstrukcji.
Źródło:: Diagnostyka; 2008, 3(47); 143-152
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Discrimination of Acoustic Emission Signals for Damage Assessment in a Reinforced Concrete Slab Subjected to Seismic Simulations
Autorzy:: Sagasta, F. A.
Torné, J. L.
Sánchez-Parejo, A.
Gallego, A.
Powiązania:: https://bibliotekanauki.pl/articles/177863.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: acoustic emission
structural health monitoring
reinforced concrete structures
signal processing
Opis:: The purpose of this work is to distinguish between Acoustic Emission (AE) signals coming from mechanical friction and AE signals coming from concrete cracking, recorded during fourteen seismic simulations conducted with the shaking table of the University of Granada on a reinforced concrete slab supported on four steel columns. To this end, a particular criterion is established based on the Root Mean Square of the AE waveforms calculated in two different temporal windows. This criterion includes a parameter calculated by optimizing the correlation between the mechanical energy dissipated by the specimen (calculated by means of measurements with accelerometers and displacement transducers) and the energy obtained from the AE signals recorded by low-frequency piezoelectric sensors located on the specimen. The final goal of this project, initiated four years ago, is to provide a reliable evaluation of the level of damage of Reinforced Concrete specimens by means of AE signals to be used in future Structural Health Monitoring strategies involving RC structures.
Źródło:: Archives of Acoustics; 2013, 38, 3; 303-310
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

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

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Skocz do pozycji: 9.

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

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Skocz do pozycji: 10.

Tytuł:: Modeling and Identification Method of Bolt Loosening of Joint Surface under Axial Tension of Multistage Disk-Drum Rotor
Autorzy:: Yue, Cong
Zheng, Xiangmin
Wang, Chaoge
Liu, Hao
Chen, Hu
Powiązania:: https://bibliotekanauki.pl/articles/24200822.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: multistage drum rotor
bolt loosening
equivalent joint stiffness
structural health monitoring
Opis:: Individual bolt at key connection positions is prone to loose when the engine is cycle-operating under complex loads. A joint surface equivalent stiffness model is derived and developed based on the connection characteristics of bolt screwing in the multi-exciting environment of the high-pressure rotor. The model is used to analyse the effect of bolt missing at circumferential positions with the equivalent stiffness loss. Vibration experiments under both axial force and lateral impact were carried out to obtain the dynamic response feature of the multistage disk-drum simulated rotor with missing one bolt at different positions. The Spearman correlation coefficient was applied to evaluate the identification effect of different measuring points on the bolt loosening position. The study shows that the eigenfrequencies of experimental results have a consistent trend with the equivalent stiffness variation caused by single bolt missing model. This method also provides a theoretical basis for the detection of bolt deviation position with multi-exciting vibration detection.
Źródło:: Eksploatacja i Niezawodność; 2023, 25, 2; art. no. 165779
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Fatigue Cracks Detection using PZT Transducers under the Influence of Uncertain Environmental Factors
Autorzy:: Dziendzikowski, M.
Klimaszewski, S.
Dragan, K.
Powiązania:: https://bibliotekanauki.pl/articles/97945.pdf
Data publikacji:: 2016
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:: structural health monitoring
PZT transducers
fatigue cracks detection
environmental factors compensation
Opis:: This paper presents technique for qualitative assessment of fatigue crack growth monitoring, utilizing guided elastic waves generated by the sparse PZT piezoelectric transducers network in the pitch – catch configuration. Two Damage Indices (DIs) correlated with the total energy received by a given sensor are used to detect fatigue cracks and monitor their growth. The indices proposed carry marginal signal information content in order to decrease their sensitivity with respect to other undesired non-controllable factors which may distort the received signal. The reason for that is to limit the false calls ratio which besides the damage detection capability of a system, plays a crucial role in applications. However, even such simplified damage indices can alter over a long term, leading to the misclassification problem. Considering a single sensing path, it is very difficult to distinguish whether the resultant change of DIs is caused by a damage or due to decoherence of these DIs. Therefore, assessment approaches based on threshold levels fixed separately for DIs obtained on each of the sensing paths, would eventually lead to a false call. An alternative approach is to compare changes of DIs for all sensing paths. Developing damage distorts the signal only for the sensing paths in its proximity. In order to decrease the misclassification risk, a method of compensating such DIs drift is proposed. The main features and damage detection capabilities of this method will be demonstrated by conducting a laboratory fatigue test of an aircraft panel. The proposed approach has been verified on a real structure during fatigue test of a helicopter tail boom.
Źródło:: Fatigue of Aircraft Structures; 2016, 8; 111-115
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Rail track and rail vehicle intelligent monitoring system
Inteligentny system monitoringu torów i pojazdów kolejowych
Autorzy:: Uhl, T.
Mendrok, K.
Chudzikiewicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/224331.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: pojazdy kolejowe
tory kolejowe
bezpieczeństwo
monitoring
rail vehicle
track
SHM - Structural Health Monitoring
Opis:: Structural Health Monitoring is becoming more and more important for today's railway. Higher requirements are set for safety and availability of both trains and tracks, that can be achieved using new type of SHM systems. Proposed SHM system is based on vibration measurements during the rail vehicle operation simultaneously with GPS position and velocity estimation. AIgorithm for rall track health assessment is formulated as inverse identification problem of dynamic parameters of rail - vehicle system. Track irregularities of tracks are identified using this procedure. The case study of the SHM system operates on rail vehicle is presented in the paper.
Monitorowanie stanu staje się coraz bardziej istotne dla dzisiejszej kolei. Wyższe wymagania są ustalane dla bezpieczeństwa i dostępności zarówno dla pociągów jak i torów, które można osiągnąć za pomocą nowego typu systemów SHM. Proponowany system SHM opiera się na pomiarach drgań w czasie eksploatacji pojazdów kolejowych jednocześnie z pozycji GPS i oszacowania prędkości. Algorytm oceny stanu toru kolejowego jest sformułowany jako inwersja problemu identyfikacji parametrów dynamicznych system tor - pojazd. Nieprawidłowości toru są identyfikowane za pomocą tej procedury. W artykule przedstawiono rozważania działania systemu SHM w przypadku pojazdu kolejowego.
Źródło:: Archives of Transport; 2010, 22, 4; 495-510
0866-9546
2300-8830
Pojawia się w:: Archives of Transport
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Wireless transmission system for a railway bridge subject to structural health monitoring
System bezprzewodowej transmisji danych do monitorowania stanu technicznego mostu kolejowego
Autorzy:: Sala, D.
Motylewski, J.
Kołakowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/327650.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: bezprzewodowa transmisja danych
monitorowanie
konstrukcja
wireless transmission of data
structural health monitoring
Opis:: One of the fast-developing research topics in electronics is the wireless data transmission, which is a highly desirable component in health monitoring of engineering structures. The paper describes a newly-designed system of wireless data transmission for structural health monitoring of a railway bridge.
Jednym z prężnie rozwijających się tematów badawczych w elektronice jest bezprzewodowa transmisja danych, na którą jest duże zapotrzebowanie w monitorowaniu stanu konstrukcji inżynierskich. W artykule opisano nowo projektowany system bezprzewodowej transmisji danych do monitorowania stanu technicznego mostu kolejowego.
Źródło:: Diagnostyka; 2009, 2(50); 69-72
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Preload monitoring in a bolted joint using Lamb wave energy
Autorzy:: Kędra, R.
Rucka, M.
Powiązania:: https://bibliotekanauki.pl/articles/201172.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Lamb waves
steel structures
bolted joints
non-destructive testing
structural health monitoring
Opis:: The knowledge of the load in prestressed bolted connections is essential for the proper operation and safety of engineering structures. Recently, bolted joints have become an area of intensive research associated with non-destructive diagnostics, in particular in the context of wave propagation techniques. In this paper, a novel procedure of bolt load estimation based on the energy of Lamb wave signals was proposed. Experimental tests were performed on a single lap joint of two steel plates. Ultrasonic waves were excited and registered by means of piezo-electric transducers, while precise measurement of the bolt load was obtained by means of using the force washer transducer. Experimental tests were supported by the finite element method analysis based on Schoenberg’s concept. The results showed that the relationship between the bolt load and signal energy was strongly nonlinear and it depended on the location of acquisition points.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 6; 1161-1169
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Determination of dispersion curves for composite materials with the use of stiffness matrix method
Autorzy:: Barski, M.
Pająk, P.
Powiązania:: https://bibliotekanauki.pl/articles/386825.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: structural health monitoring
layered composite materials
guided waves
dispersion curves
stiffness matrix method
Opis:: Elastic waves used in Structural Health Monitoring systems have strongly dispersive character. Therefore it is necessary to determine the appropriate dispersion curves in order to proper interpretation of a received dynamic response of an analyzed structure. The shape of dispersion curves as well as number of wave modes depends on mechanical properties of layers and frequency of an excited signal. In the current work, the relatively new approach is utilized, namely stiffness matrix method. In contrast to transfer matrix method or global matrix method, this algorithm is considered as numerically unconditionally stable and as effective as transfer matrix approach. However, it will be demonstrated that in the case of hybrid composites, where mechanical properties of particular layers differ significantly, obtaining results could be difficult. The theoretical relationships are presented for the composite plate of arbitrary stacking sequence and arbitrary direction of elastic waves propagation. As a numerical example, the dispersion curves are estimated for the lamina, which is made of carbon fibers and epoxy resin. It is assumed that elastic waves travel in the parallel, perpendicular and arbitrary direction to the fibers in lamina. Next, the dispersion curves are determined for the following laminate [0°, 90°, 0°, 90°, 0°, 90°, 0°, 90°] and hybrid [Al, 90°, 0°, 90°, 0°, 90°, 0°], where Al is the aluminum alloy PA38 and the rest of layers are made of carbon fibers and epoxy resin.
Źródło:: Acta Mechanica et Automatica; 2017, 11, 2; 121-128
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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