Готові списки джерел за темами / Plate-like structure

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Добірка наукової літератури з теми "Plate-like structure"

Автор: Grafiati
Опубліковано: 10 березня 2023

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Статті в журналах з теми "Plate-like structure"

1

Ručevskis, Sandris, and Andris Chate. "DAMAGE IDENTIFICATION IN A PLATE-LIKE STRUCTURE USING MODAL DATA." Aviation 17, no. 2 (July 1, 2013): 45–51. http://dx.doi.org/10.3846/16487788.2013.805863.

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In this paper, an on-going research effort aimed at detecting and localising damage in plate-like structures by using mode shape curvature–based damage detection algorithms is described. Two alternative damage indexes are examined. The first one uses exclusively mode shape curvature data from the damaged structure. This method was originally developed for beam-like structures. In this paper, the method is generalised to plate-like structures that are characterised by two-dimensional mode shape curvature. To examine limitations of the method, several sets of simulated data are applied and damage detection results are compared to the damage identification method that requires mode shape information from both the undamaged and the damaged states of the structure. The modal frequencies and the corresponding mode shapes for the first 15 modes of a plate are obtained via finite element models. Simulated test cases include damage of various levels of severity. In order to ascertain the sensitivity of the proposed method to noisy experimental data, numerical mode shapes are corrupted with different levels of random noise.
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2

Griso, Georges, Larysa Khilkova, Julia Orlik, and Olena Sivak. "Homogenization of Perforated Elastic Structures." Journal of Elasticity 141, no. 2 (June 5, 2020): 181–225. http://dx.doi.org/10.1007/s10659-020-09781-w.

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Abstract The paper is dedicated to the asymptotic behavior of $\varepsilon$ ε -periodically perforated elastic (3-dimensional, plate-like or beam-like) structures as $\varepsilon \to 0$ ε → 0 . In case of plate-like or beam-like structures the asymptotic reduction of dimension from $3D$ 3 D to $2D$ 2 D or $1D$ 1 D respectively takes place. An example of the structure under consideration can be obtained by a periodic repetition of an elementary “flattened” ball or cylinder for plate-like or beam-like structures in such a way that the contact surface between two neighboring balls/cylinders has a non-zero measure. Since the domain occupied by the structure might have a non-Lipschitz boundary, the classical homogenization approach based on the extension cannot be used. Therefore, for obtaining Korn’s inequalities, which are used for the derivation of a priori estimates, we use the approach based on interpolation. In case of plate-like and beam-like structures the proof of Korn’s inequalities is based on the displacement decomposition for a plate or a beam, respectively. In order to pass to the limit as $\varepsilon \to 0$ ε → 0 we use the periodic unfolding method.
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3

JOVANOVIĆ, DRAGANA J., IVANA LJ VALIDŽIĆ, MIODRAG MITRIĆ, and JOVAN M. NEDELJKOVIĆ. "Crystal structure studies on plate/shelf like disodium ditungstate." Bulletin of Materials Science 36, no. 1 (February 2013): 149–52. http://dx.doi.org/10.1007/s12034-013-0419-6.

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4

Zhou, Kemin, and Xia Li. "Optimization of Grillage-like Continuum by Triangle Plate Element." Open Civil Engineering Journal 6, no. 1 (March 6, 2012): 8–14. http://dx.doi.org/10.2174/1874149501206010008.

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The volume of grillages with stress constraints is minimized. An optimal beams system or plate with reinforced ribs is obtained to present the optimal structure. A grillage-like continuum material model is adapted. Structure is analyzed by finite element method with triangle plate elements. The geometric matrix of triangle plate element in explicit formulation about area coordinates is presented. The stiffness matrix of grillage-like continuum material model is derived. The material distribution field in design domain is optimized by fully-stressed criterion. The densities and orientations of the beam or reinforced ribs at nodes in grillages are taken as design variables. The densities and orientations vary in design domain continuously. The optimal distribution fields of bend moments, flexure displacement and material are obtained simultaneously. Subsequently the discrete structures are founded based on the optimal material distribution fields. The performances of different elements are compared. The optimization procedure is accomplished by computer program automatically.
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5

Obara, Paulina, and Justyna Tomasik. "Parametric Analysis of Tensegrity Plate-Like Structures: Part 2—Quantitative Analysis." Applied Sciences 11, no. 2 (January 10, 2021): 602. http://dx.doi.org/10.3390/app11020602.

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The study includes a parametric analysis of a group of tensegrity plate-like structures built with modified Quartex modules. The quantitative assessment, including the calculation of the structure’s response to constant loads, was carried out. A static parametric analysis was performed, with particular emphasis on the influence of the initial prestress level on the displacements, the effort, and the stiffness of the structure. A geometrical non-linear model was used in the analysis. A reliable assessment required introducing a parameter for determining the influence of the initial prestress level on the overall stiffness of the structure at a given load. The stiffness of the structure was found to depend not only on the geometry and material properties, but also on the initial prestress level and external load. The results show that the effect of the initial prestress on the overall stiffness of the structure is greater with less load and that the effect of load is most significant with low pre-stressing forces. The analysis demonstrates that the control of static parameters is possible only when infinitesimal mechanisms occur in the structure.
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6

Obara, Paulina, and Justyna Tomasik. "Parametric Analysis of Tensegrity Plate-Like Structures: Part 2—Quantitative Analysis." Applied Sciences 11, no. 2 (January 10, 2021): 602. http://dx.doi.org/10.3390/app11020602.

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Анотація:
The study includes a parametric analysis of a group of tensegrity plate-like structures built with modified Quartex modules. The quantitative assessment, including the calculation of the structure’s response to constant loads, was carried out. A static parametric analysis was performed, with particular emphasis on the influence of the initial prestress level on the displacements, the effort, and the stiffness of the structure. A geometrical non-linear model was used in the analysis. A reliable assessment required introducing a parameter for determining the influence of the initial prestress level on the overall stiffness of the structure at a given load. The stiffness of the structure was found to depend not only on the geometry and material properties, but also on the initial prestress level and external load. The results show that the effect of the initial prestress on the overall stiffness of the structure is greater with less load and that the effect of load is most significant with low pre-stressing forces. The analysis demonstrates that the control of static parameters is possible only when infinitesimal mechanisms occur in the structure.
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7

Chen, Kuan-Ting, Jun-Wei Huang, Wei-Ting Lin, Tsung-Yuan Kuo, Chi-Sheng Chien, Ching-Ping Chang, and Yung-Ding Lin. "Effects of Micro-Arc Oxidation Discharge Parameters on Formation and Biomedical Properties of Hydroxyapatite-Containing Flower-Like Structure Coatings." Materials 16, no. 1 (December 21, 2022): 57. http://dx.doi.org/10.3390/ma16010057.

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Анотація:
The micro-arc oxidation (MAO) process was used to prepare hydroxyapatite-containing flower-like structure coatings on commercially pure titanium substrates with various values of the applied voltage (330, 390, 450 V), applied current (0.4, 0.5, 0.6 A), and duration time (1, 3, 5 min). It was found that the surface morphology of the coatings was determined primarily by the applied voltage. A voltage of 330 V yielded a flower-like/plate-like structure, while voltages of 390 V and 450 V produced a flower-like structure and a porous morphology, respectively. The applied current and duration time mainly affected the coating formation speed and petal size of the flower-like structures, respectively. The coatings prepared using voltages of 330 V and 390 V (0.6 A, 5 min) both contained Ti, TiO2-A (anatase), TiO2-R (rutile), DCPD (CaHPO4·2H2O, calcium hydrogen phosphate), and hydroxyapatite (HA).However, the latter coating contained less DCPD and had a higher HA/DCPD ratio and a Ca/P ratio closer to the ideal value of HA. The coating prepared with a voltage of 450 V consisted mainly of Ti, TiO2-A, TiO2-R, and CaTiO3.For the coatings prepared with a voltage of 390 V, the flower-like structures consisted mainly of HA-containing compounds. DCPD plate-like structures were observed either between the HA-containing flower-like structures (330 V samples) or within the flower-like structures themselves (390 V samples). The coating surfaces with flower-like/plate-like or flower-like structures had a greater roughness, which increased their hydrophilicity and resulted in superior bioactivity (SBF immersion) and biocompatibility (MG-63 cell culture). The optimal biomedical performance was found in the 390 V coating due to its flower-like structure and high HA/DCPD ratio.
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8

Obara, Paulina, and Justyna Tomasik. "Parametric Analysis of Tensegrity Plate-Like Structures: Part 1—Qualitative Analysis." Applied Sciences 10, no. 20 (October 11, 2020): 7042. http://dx.doi.org/10.3390/app10207042.

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The study includes parametric analysis of special spatial rod grids called tensegrity plate-like structures. Tensegrity structures consist of only compression and tension components arranged in a system, whose unique mechanical and mathematical properties distinguish them from conventional cable–strut frameworks. Complete analysis of tensegrity structures is a two-stage process. The first stage includes the identification of self-stress states and infinitesimal mechanisms (qualitative analysis). The second stage focuses on the behaviour of tensegrities under external loads (quantitative analysis). In the paper, a qualitative analysis of tensegrity plate-like structures built with modified Quartex modules was conducted. Starting from a single-module structure, more complex cases were sequentially analysed. The different ways of plate support were considered. To carry out a qualitative assessment, a spectral analysis of the truss matrices and singular value decomposition of the compatibility matrix were used. The characteristic features of tensegrity structures were identified. On this basis, the plates were classified into one of the four groups defined in the paper, i.e., ideal tensegrity, “pure” tensegrity and structures with tensegrity features of class 1 or class 2. This classification is important due to different behaviours of the structure under external actions. The qualitative analysis carried out in the paper is the basis for a quantitative analysis.
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9

Huynh, Thanh-Canh, So-Young Lee, Ngoc-Loi Dang, and Jeong-Tae Kim. "Sensing Region Characteristics of Smart Piezoelectric Interface for Damage Monitoring in Plate-Like Structures." Sensors 19, no. 6 (March 19, 2019): 1377. http://dx.doi.org/10.3390/s19061377.

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For impedance-based damage detection practices, the sensing range of piezoelectric devices is an important parameter that should be determined before real implementations. This study presents numerical and experimental analyses for characterizing the sensing region of a smart PZT (lead–zirconate–titanate) interface for damage monitoring in plate-like structures. First, a finite element (FE) model of the PZT interface mounted on a plate structure is established. The impedance responses of the PZT interface are numerically simulated under different damage locations inflicted in the plate domain. The impedance features are extracted from the impedance signatures to analyze the sensing distance and the damage detectability of the PZT interface. Next, the splice plate of a bolted connection is selected as a practical plate-like structure for the experimental examination of the PZT interface’s sensing region on a limited plate domain. The damage sensitivity behavior of the PZT interface is analyzed with respect to the damage location on the splice plate. An FE analysis of the corresponding PZT interface-splice plate system is also conducted to support the experimental results.
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10

Yang, Jongmin, Yujia Chen, Jun-Duo Zhang, Wei-Xi Huang, and Hyung Jin Sung. "A self-propelled flexible plate with a keel-like structure." Physics of Fluids 33, no. 3 (March 1, 2021): 031902. http://dx.doi.org/10.1063/5.0041316.

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Дисертації з теми "Plate-like structure"

1

Delhorme, Maxime. "Thermodynamics and Structure of Plate-Like Particle Dispersions." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00818964.

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A considerable amount of mineral particles are found to have a plate-like shape. The work in this thesis concerns theoretical investigations, using a Monte Carlo method, of the properties of such particles in aqueous solutions. The objectives were first to create a model that could capture the essential physics of clay suspensions and also to understand the role of thermodynamics in certain chemical processes. For all investigations, the results are related to experimental studies. The acid-base behavior of clays have been studied, using the primitive model, and an excellent agreement between simulated and experimental results was found. The formation of gel phases as a function of the charge anisotropy have also been investigated. Liquid-gel and sol-gel transitions are found to occur for high and moderate charge anisotropy, respectively. These transitions were also found to be size and salt dependent. In absence of charge anisotropy, a liquid-glass transition is reported. The formation of smectic and columnar liquid crystals phases with plate-like particles has been found to be favored by a strong charge anisotropy, in opposition to what was observed for nematic phases. New liquid-crystal phases were also reported. The stability and growth of nanoplatelets is discussed. It was found that the internal Coulombic repulsion could be the cause of the limited growth of C-S-H platelets. The influence of thermodynamics on the agregation mode of such platelets was also investigated
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2

Khoza, Dineo. "Topology optimization of plate-like structures." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-04102007-185634.

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3

Venturini, Nicolas. "Experimental Broadband Signal Reconstruction for Plate-like Structures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20470/.

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In the Structural Health Monitoring (SHM) field, the Acoustic Emission (AE) technique is a passive method by which damage is localized and identified by capturing Lamb Waves (LW) signals propagating in a plate-like structure. The reconstruction of emitted signals from damage at the source location constitutes one of the main challenges faced by the SHM community. Recently, the application of a Frequencies Compensation Transfer Function (FCTF) has been used to reconstruct narrowband and broadband signals through a hybrid experimental and numerical Time Reversal (TR) process on aluminum plates. This study aims to reconstruct through experimental methods different types of narrowband and broadband signals on different plate-like structures making use of FCTF. In particular, Hanning Window (HW) and numerical broadband signals have been reconstructed for aluminum and steel plates. The results obtained in this study show how the FCTF method can be applied to different types of materials in plate-like structures. Moreover, the FCTF method has been applied on real broadband signals emitted by the Pencil Lead Break (PLB) technique and Rock Impact (RI) test. These last results prove that the FCTF method is able to compensate for the frequency changes on a single wave packet. Such results are fundamental, as they open the possibility to reconstruct any type of source signals emitted by any damage type.
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4

Kumar, Yadav Susheel. "Damage Detection and Characterization in Plate Like Structures." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/306997.

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Анотація:
Large civil infrastructure systems all over the world have become an integral part of our civilization. The inspection and maintenance of these structures for public safety is a difficult task. The assessment of integrity of such huge structures due to local damages is even more difficult to deal with. The conventional inspections are performed manually, generally by visual examination and sometimes by more advanced techniques like ultrasonic, electromagnetic and fiber optic techniques. These inspections involve human interventions, depend on individual inspector's experience, and are time consuming. Such inspection methods may not be very useful for real time health assessment of a structure in service and as a result are not very helpful in preventing any disastrous situation through early warning. Therefore, it is very important to look for a comprehensive strategy of global integrity monitoring infused with information about local damages in the structure. For local damage assessment the current state of the health monitoring technology lacks a generalized and definitive approach to the identification and localization of damage. In past decades several signal processing tools have been used for solving different health monitoring problems but the commutability of the tools between different problems has been restricted. Fundamental reasons for this shortcoming have never been investigated in detail. In this dissertation an investigation has been carried out employing almost all promising feature extraction tools on a representative problem - a plate with rivet holes. The problem considered has radial cracks around rivet holes in a joint panel of a steel truss bridge. Such defects are very difficult to detect. Although well established, Lamb wave based nondestructive evaluation techniques are revisited and new tools are developed to address this issue. Simulation of the scattered ultrasonic wave field is carried out using the finite element method. This ultrasonic wave field is further analyzed to evaluate the integrity of the structure using various feature extraction (FE) techniques. Joint time-frequency-energy representation is obtained from ultrasonic signals recorded at various locations on the plate (joint panel) and used to extract damage sensitive features. Those features were then used to formulate a new Damage Parameter (DP) for better visualization of the crack. Results are shown to demonstrate the comparative effectiveness of these techniques. It is concluded that any particular FE technique cannot detect all possible sizes and orientations of the crack. It is suggested that the statistical occurrence and pattern of the crack must be visualized through a few selective FE techniques in a sequence. Modeling of the wave scattering phenomenon by conventional numerical techniques such as finite element method requires very fine mesh at high frequencies necessitating heavy computational power. Distributed point source method (DPSM) which is a recently developed semi-analytical technique, is applied to model the scattering of ultrasonic wave field on representative problem geometries and the results are used to diagnose structural damages. DPSM is a newly developed robust mesh-free technique for simulating ultrasonic, electrostatic and electromagnetic field problems. In most of the previous studies the DPSM technique has been applied to model two dimensional surface geometries and relatively simple three dimensional scatterer geometries. It has been very difficult to perform the wave scattering analysis for very complex three-dimensional geometries. This technique has been extended to model wave scattering in an arbitrary geometry. The simulation has been carried out with and without the presence of cracks near the rivet holes.
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5

Attarian, Vatche. "Long-term structural health monitoring of plate-like structures using distributed guided wave sensors." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/24840.

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Aircraft, containers, and storage tanks contain plate-like structures that are safety critical. The structures often undergo non-destructive inspections. The inspection frequency tends to be over-conservatively high, and it may be possible to reduce the intervals between inspections to realize cost savings. This goal can possibly be realized by automated structural health monitoring (SHM) of structures using sparse active guided wave sensor arrays. Guided waves are sensitive to small defects and can propagate long distances across feature dense plates. Thus, a guided wave SHM system that enables reliable detection of critical defects or monitoring of their growth can potentially be used to reduce the frequency of inspections for real structures. Industrial guided wave SHM systems must be reliable throughout prolonged exposure to temperature, humidity, and loading changes encountered in operation. Research at Imperial College shows that temperature compensation and subtraction between monitored guided wave signals and baselines acquired from healthy plates enables detection of 1.5% reflection change over areas ~1 m^2 in the presence of thermal swings and uniform liquid layers. These results and findings from scattering studies indicate it may be possible to detect reflections from hole type defects and notches affecting structures during their operation. An issue is that demonstrations of SHM system capabilities have only been shown in controlled laboratory tests within short periods following baseline acquisition. There is concern whether sustained exposure to service conditions will subject transducer elements to irreversible changes and introduce variability in baseline subtraction results that would mask signals due to slowly growing damage. This thesis studies the reliability of guided wave SHM for monitoring plate-like structures over longer time periods. The theoretical characteristics of the fundamental Lamb waves and their use to monitor and detect damage are reviewed. Strategies for sensing and signal processing are described alongside experimental validation of their performance. The effectiveness of the SHM system is tested in experiments where damage-free plates are exposed to British weather as well as thermal variations in an environmental chamber. The monitoring capabilities of bonded piezoelectric sensors are quantified and compared to the performance achieved using electromagnetic acoustic transducers. Experimental results and findings from simulations of bonded piezoelectric transduction establish that performances achieved with bonded sensors degrade due to variations in the properties of adhesives used to attach sensors to plates. EMATs are relatively stable and capable of enabling detection of 1.5% reflection change at points away from the edges of plates after sustained exposure to thermal cycling loads.
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Kahraman, Engin. "Investigation Of The Dynamic Properties Of Plate-like Structures." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613703/index.pdf.

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This study presents the investigation and the verification of the modal parameters of a plate-like structure by using different modal analysis methods. A fin-like structure which is generally used in aircraft is selected as a subcategory of a plate-like test structure. In the first part of the thesis, the natural frequencies and the corresponding mode shapes of the fin are extracted by Finite Element Analysis method. Classical Modal Analysis and Testing methods comprising both impact hammer and modal shaker applications are then applied in order to obtain the modal parameters such as
resonance frequencies, mode shapes and damping ratios. In the second part, a recent modal analysis technique, Operational Modal Analysis, is also applied in the laboratory environment. Since Operational Modal Analysis method does not require any information of input forcing, the fin structure is tested under both mechanical and acoustical types of excitations without measuring the given input forces. Finally, Operational Modal Analysis and Testing is also performed under various flow conditions generated in the wind tunnel which may simulate the real operating environment for the fin structure. The modal parameters extracted under these flow conditions are then compared with the previously obtained Finite Element, Classical and Operational Modal Analyses results.
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7

Prado, Vander Teixeira [UNESP]. "Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/111127.

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Made available in DSpace on 2014-12-02T11:16:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-09-15Bitstream added on 2014-12-02T11:20:51Z : No. of bitstreams: 1 000799830.pdf: 4517190 bytes, checksum: 4566f2d205fed1f4cb035a7c44ec4214 (MD5)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Esta tese apresenta o estudo e implementação de técnicas de inspeção de estruturas delgadas tipo placa utilizando arrays de transdutores piezelétricos e ondas acústicas guiadas, associados a métodos de formação e composição de imagens. A detecção de danos em estruturas através de ondas guiadas e arrays de transdutores é um campo de pesquisa de grande importância, principalmente em áreas como a aeroespacial e de geração de energia, que utilizam estruturas delgadas e que exigem inspeção eficaz e completa, visando confiabilidade e segurança. O emprego de ondas acústicas guiadas permite inspecionar grandes áreas utilizando sensores sem a necessidade de realizar varreduras pela peça, de maneira não-destrutiva. Além disso, apresenta sensibilidade a diversos tipos de defeitos, como furos, corrosão, variação de espessura e defeitos superficiais. São estudados aspectos de propagação de ondas, diferentes modos de propagação e dispersão, assim como as principais características dos arrays e a formação de imagens. Os estudos teóricos são acompanhados por simulações usando os softwares MATLAB e PZFlex para obtenção dos modos de propagação das ondas, interação com defeitos e diagramas de radiação dos transdutores, cujos resultados são validados por meio da análise experimental em placas de materiais isotrópicos (alumínio). Montou-se um array linear de transdutores piezelétricos com 16 elementos na borda de uma placa de alumínio com defeitos artificiais. Os sinais provenientes de todas as possíveis combinações dos pares transmissor-receptor foram adquiridos para a utilização de técnicas de abertura sintética. A primeira contribuição deste trabalho é um método para detecção dos defeitos baseado na fase instantânea dos sinais. Substituindo-se a informação de amplitude dos sinais pela fase instantânea (IP) no método de formação de imagem, ...
This thesis presents the study and implementation of non-destructive testing techniques of platelike structures using piezoelectric array transducers and guided acoustic waves, associated with beamforming techniques and image compounding methods. Damage detection in structures using guided waves and arrays is a promising research area, especially in the aerospace and energy fields, where the use of plate-like structures demands thorough inspection due to the high safety levels of operation. Guided acoustic waves techniques can be used to inspect relatively large areas without the necessity of moving the transducers, in a non-destructive way. There are different propagation modes that can be coupled to the plate, and each mode is sensitive to specific types of defects, like notches, delamination and surface defects. Wave propagation, different propagation modes and dispersion characteristics, as well as arrays characteristics and imaging algorithms, are studied. MATLAB and PZFlex simulations are used to get further insight in the theoretical aspects, to obtain dispersion curves, interaction with defects and array response. Experimental results validate the simulations with isotropic materials (aluminum). A 16-elements piezoelectric linear array is mounted at the border of an aluminum plate with artificial defects. The signals related to all combinations of transmit-receive pairs are obtained with burst excitation, for use with synthetic aperture (SA) techniques. The first contribution of this work is a method for defect detection based on the instantaneous phase of the aperture data. The instantaneous phase (IP) image is obtained by replacing the amplitude information by the instantaneous phase in the conventional SA beamforming. From the analysis of the IP image, a threshold level is proposed in terms of the number of signals used for imaging. This threshold is applied to the IP image, resulting ...
FAPESP: 10/02240-0
FAPESP: 10/16400-0
FAPESP: 13/00330-0
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8

Haghighattalab, Armin. "Finite Element Modeling of Spiral Frequency Steerable Acoustic Transducers (FSATs) for guided waves based Structural Health Monitoring of plate-like structures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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Анотація:
Structural Health Monitoring (SHM) is an emerging area of research associated to improvement of maintainability and the safety of aerospace, civil and mechanical infrastructures by means of monitoring and damage detection. Guided wave structural testing method is an approach for health monitoring of plate-like structures using smart material piezoelectric transducers. Among many kinds of transducers, the ones that have beam steering feature can perform more accurate surface interrogation. A frequency steerable acoustic transducer (FSATs) is capable of beam steering by varying the input frequency and consequently can detect and localize damage in structures. Guided wave inspection is typically performed through phased arrays which feature a large number of piezoelectric transducers, complexity and limitations. To overcome the weight penalty, the complex circuity and maintenance concern associated with wiring a large number of transducers, new FSATs are proposed that present inherent directional capabilities when generating and sensing elastic waves. The first generation of Spiral FSAT has two main limitations. First, waves are excited or sensed in one direction and in the opposite one (180 ̊ ambiguity) and second, just a relatively rude approximation of the desired directivity has been attained. Second generation of Spiral FSAT is proposed to overcome the first generation limitations. The importance of simulation tools becomes higher when a new idea is proposed and starts to be developed. The shaped transducer concept, especially the second generation of spiral FSAT is a novel idea in guided waves based of Structural Health Monitoring systems, hence finding a simulation tool is a necessity to develop various design aspects of this innovative transducer. In this work, the numerical simulation of the 1st and 2nd generations of Spiral FSAT has been conducted to prove the directional capability of excited guided waves through a plate-like structure.
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9

Rodrigues, Marques Hugo. "Omnidirectional and unidirectional SH0 mode transducer arrays for guided wave evaluation of plate-like structures." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/14021.

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Structures made of plate-like components are common in a variety of industries where the impacts of structural failures are severe. In many cases these structures are surrounded and only partially accessible, such as storage tanks and bridges, making them difficult to inspect frequently. The application of ultrasonic Guided Waves (GWs) in the evaluation and monitoring of relatively large plate-like structures is evermore a feasible option with the continuous development of transducer arrays. The use of transducer arrays is however complex due to directional control and the existence of many GW modes. Aimed at the evaluation of plate-like structures, in this research two piezoelectric transducer arrays respectively capable of omnidirectional and unidirectional control of the fundamental GW shear mode in plates (SH0) with above 20 dB mode purity are successfully designed, produced and validated. Omnidirectionality facilitates full structural evaluation coverage and can lead to defect mapping of large volumes with relatively few transducers. A unidirectional beam with relatively high mode purity facilitates evaluation of specific structural locations. Preference to the SH0 mode was given because of its non-dispersive and in-plane propagation properties making it more suitable than other GW modes to propagation in structures surrounded by fluid material. To enable the array development, a number of monolithic piezoelectric thickness-shear transducers of varied area were characterised with respect to GW mode directionality, amplitude and SH0 mode purity. The characterisation of each thickness-shear transducer allows for optimised superposition manipulation for specific applications. A single characterised shear transducer was selected for use in the development of omnidirectional and unidirectional SH0 mode transducer arrays. To aid development a linear superposition analysis model was produced and used to predict for a circular array design the optimum parameters for omnidirectional SH0 mode transmission with significant mode purity. A range of parameter combinations were evaluated and their predicted influence on array performance was characterised. The same method was employed to optimise a dual row linear array design for the unidirectional transducer array. All results were validated by FE models and later with empirical data. Both developed transducer arrays were characterised with respect to GW mode directionality, magnitude and SH0 mode purity. Both their detection sensitivity to pertinent defects and structures was validated, demonstrating relevance to Non Destructive Evaluation (NDE) and Structural Health Monitoring (SHM) applications.
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Koper, Ewa Joanna. "Differentiation of dendrites and the analysis of spine-like structures on lobula plate tangential cells in Drosophila melanogaster." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984614338.

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Книги з теми "Plate-like structure"

1

Banks, H. Thomas. Detection of non-symmetrical damage in smart plate-like structures. Hampton, VA: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1998.

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Banks, H. Thomas. Detection of non-symmetrical damage in smart plate-like structures. Hampton, Va: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1998.

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Banks, H. Thomas. Detection of non-symmetrical damage in smart plate-like structures. Hampton, VA: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1998.

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R, Emeric P., and Institute for Computer Applications in Science and Engineering., eds. Detection of non-symmetrical damage in smart plate-like structures. Hampton, VA: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1998.

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Banks, H. Thomas. Detection of non-symmetrical damage in smart plate-like structures. Hampton, VA: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1998.

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6

Altenbach, Holm, Svetlana Bauer, Victor A. Eremeyev, Gennadi I. Mikhasev, and Nikita F. Morozov, eds. Recent Approaches in the Theory of Plates and Plate-Like Structures. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87185-7.

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7

Center, Langley Research, ed. A treatise on equivalent-plate stiffnesses for stiffened laminated-composite plates and plate-like lattices. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 2011.

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8

Recent Approaches in the Theory of Plates and Plate-Like Structures. Springer International Publishing AG, 2021.

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9

Recent Approaches in the Theory of Plates and Plate-Like Structures. Springer International Publishing AG, 2023.

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10

Levin, Frank S. Spin ½ and the Periodic Table. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198808275.003.0011.

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Some major quantal developments are described in Chapter 10. The Stern-Gerlach experiment is encountered first, wherein a beam of silver atoms is deflected by a magnetic field, leading to a pair of traces on a detecting plate. Next is the proposal that electrons have a new attribute known as spin, used to explain the Stern-Gerlach result, thereby confirming the validity of this new attribute. To account for the structure of the periodic table, the central-field approximation is introduced. In it, electrons in an atom are treated like those in hydrogen, except that they have four not three quantum numbers, the fourth related to spin. The Pauli Exclusion Principle requires that no four can be the same for any electron in the atom, a feature that explains the occurrence of shells in the periodic table. The electronic structure of various atoms is stated, with silver being a giant spin ½ system.
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Частини книг з теми "Plate-like structure"

1

Matikas, Theodore E., and Dimitrios G. Aggelis. "Acoustic Emission in Plate-Like Structures." In Springer Tracts in Civil Engineering, 221–45. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67936-1_9.

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2

Burgaz, Engin. "PU Rigid Nanocomposite Foams Containing Plate-Like Nanofillers." In Advanced Structured Materials, 103–64. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19558-8_3.

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3

Aizikovich, Sergey, Andrey Vasiliev, Igor Sevostianov, Irina Trubchik, Ludmila Evich, and Elena Ambalova. "Analytical Solution for the Bending of a Plate on a Functionally Graded Layer of Complex Structure." In Shell-like Structures, 15–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21855-2_2.

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4

Zubov, Leonid M., and Evgeniya V. Goloveshkina. "Effect of Distributed Dislocations on Large Deformations of Cylindrical Tube made of Micropolar Elastic Material." In Recent Approaches in the Theory of Plates and Plate-Like Structures, 287–305. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87185-7_22.

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5

Peiler, Clemens, Andreas Kappel, and Christian Mittelstedt. "Semi-analytical Model for the Close-Range Stress Analysis of Transverse Cracks in Composite Plates." In Recent Approaches in the Theory of Plates and Plate-Like Structures, 203–16. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87185-7_16.

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6

Kirillova, Irina V., and Leonid Y. Kossovich. "Analysis of Solutions for Elliptic Boundary Layer in Cylindrical Shells at Edge Shock Loading." In Recent Approaches in the Theory of Plates and Plate-Like Structures, 131–40. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87185-7_11.

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7

Smirnov, Andrei L., and Grigory P. Vasiliev. "Vibration Control of a Non-homogeneous Circular Thin Plate." In Recent Approaches in the Theory of Plates and Plate-Like Structures, 267–76. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87185-7_20.

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8

Jaiani, George. "Hierarchical Models of Conduction of Heat in Continua Contained in Prismatic Shell-like Domains." In Recent Approaches in the Theory of Plates and Plate-Like Structures, 89–102. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87185-7_8.

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9

Kaplunov, Julius, Danila A. Prikazchikov, and Tomaž Savšek. "Dynamic Sliding Contact for a Thin Elastic Layer." In Recent Approaches in the Theory of Plates and Plate-Like Structures, 103–14. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87185-7_9.

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10

Kolpakov, Alexander G., and Sergei I. Rakin. "Dimension Reduction in the Plate with Tunnel Cuts." In Recent Approaches in the Theory of Plates and Plate-Like Structures, 141–53. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87185-7_12.

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Тези доповідей конференцій з теми "Plate-like structure"

1

Dris, El Yamine, R. Drai, A. Benammar, and D. Berkani. "Acoustic Emission Source Localization in Plate-Like Structure." In 2017 European Conference on Electrical Engineering and Computer Science (EECS). IEEE, 2017. http://dx.doi.org/10.1109/eecs.2017.44.

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2

Xu, Chunguang, Joseph L. Rose, Fei Yan, Xiang Zhao, Donald O. Thompson, and Dale E. Chimenti. "DEFECT SIZING OF PLATE-LIKE STRUCTURE USING LAMB WAVES." In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Proceedings of the 35th Annual Review of Progress in Quantitative Nondestructive Evaluation. AIP, 2009. http://dx.doi.org/10.1063/1.3114145.

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3

Tan, Kaizhou, Zhaohuan Tang, Xia Zhang, Qiang Fu, Wensuo Chen, and Yi Zhong. "A Novel Resistive Field Plate Superjunction like Structure Simulation Study." In 2019 IEEE International Conference on Electron Devices and Solid-State Circuits (EDSSC). IEEE, 2019. http://dx.doi.org/10.1109/edssc.2019.8754314.

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4

Zhan, Zaifu, Fuping Wang, and Shen Wang. "Ultrasonic Nonlinear Responses of a Closed Crack in Plate-like Structure." In 2021 IEEE International Conference on Artificial Intelligence and Computer Applications (ICAICA). IEEE, 2021. http://dx.doi.org/10.1109/icaica52286.2021.9497962.

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5

Feng, Yongming, Li Zhou, and Zhen Li. "Damage detection for plate-like structure using matching pursuits with chirplet atom." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Masayoshi Tomizuka. SPIE, 2011. http://dx.doi.org/10.1117/12.880263.

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6

Majewska, Katarzyna, Magdalena Mieloszyk, Wieslaw Ostachowicz, and Michal Jurek. "Multi-rosettes sensing analysis for an impact assessment in composite plate-like structure." In Health Monitoring of Structural and Biological Systems XII, edited by Tribikram Kundu. SPIE, 2018. http://dx.doi.org/10.1117/12.2295693.

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7

Sadri, Amir. "Robust system identification and control design for a curved plate-like active structure." In Guidance, Navigation, and Control Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-3960.

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8

MAJEWSKA, KATARZYNA, MAGDALENA MIELOSZYK, and WIESLAW OSTACHOWICZ. "Elasto-acoustic Wave Source Localization in Composite Plate-like Structure using Muti-rosetts Sensing." In Structural Health Monitoring 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/shm2017/13929.

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9

Zhao, Chunyu, Xin Chen, Jian Li, and Yang Liu. "Biaxial Stress Inversion in Plate-Like Structures Based on Acoustoelastic Guided Waves." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-96718.

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Abstract The nondestructive evaluation of stress using guided waves through the acoustoelastic effect has significant importance for the safety of the structure. In this paper, a Semi-Analytical Finite Element (SAFE) method is used to develop the acoustoelastic theory of guided waves propagating in plate-like structures with arbitrarily shaped cross-sections. Based on the anisotropy of the material induced by the axial force, a method for in-situ detection of biaxial stress through multi-angle dispersion change was developed. The inversion algorithm was validated by data of the SAFE method and the Sweeping Frequency Finite Element Modeling (SFFEM) method, respectively. The inversion results of S0 mode under this method are mainly studied, which can achieve accurate stress in-situ detection of the plate-like structure, and the Root Mean Square Error (RMS) can reach below 1%.
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Liu, Yan, Yuemin Wang, Chuanjun Shen, and Fengrui Sun. "Damage detection for plate-like structure based on Lamb wave and time reversal theory." In 2012 5th International Congress on Image and Signal Processing (CISP). IEEE, 2012. http://dx.doi.org/10.1109/cisp.2012.6469863.

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