Dissertations / Theses on the topic 'Plate-like structure'
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Delhorme, Maxime. "Thermodynamics and Structure of Plate-Like Particle Dispersions." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00818964.
Full textKhoza, Dineo. "Topology optimization of plate-like structures." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-04102007-185634.
Full textVenturini, Nicolas. "Experimental Broadband Signal Reconstruction for Plate-like Structures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20470/.
Full textKumar, Yadav Susheel. "Damage Detection and Characterization in Plate Like Structures." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/306997.
Full textAttarian, 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.
Full textKahraman, 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.
Full textresonance 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.
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.
Full textFundação 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
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.
Find full textRodrigues, 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.
Full textKoper, 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.
Full textKoper, Ewa. "Differentiation of dendrites and the analysis of spine- like structures on Lobula Plate Tangential Cells in Drosophila melanogaster." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-69244.
Full textWebster, Keith Gordon. "Investigation of Close Proximity Underwater Explosion Effects on a Ship-Like Structure Using the Multi-Material Arbitrary Lagrangian Eulerian Finite Element Method." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/31077.
Full textMaster of Science
Prado, Vander Teixeira. "Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers = Ensaios não-destrutivos por ultrassom de estruturas tipo placa utilizando arrays de transdutores piezelétricos /." Ilha Solteira, 2014. http://hdl.handle.net/11449/111127.
Full textCo-orientador: Oscar Martinez-Graullera
Banca: Claudio kitano
Banca: Samuel da Silva
Banca: Nicolas Leonardo Pérez Alvarez
Banca: Joaquim Miguel Maia
Resumo: 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, ...
Abstract: 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 ...
Doutor
MERLO, Eugenio MARINO. "Metodi di analisi passiva mediante sensori piezoelettrici in sistemi di monitoraggio strutturale e sviluppo di algoritmi per la localizzazione di impatti. (Passive analysis methods using piezoelectric sensors in structural monitoring systems and development of algorithms for the localization of impacts.)." Doctoral thesis, 2019. http://hdl.handle.net/2158/1153042.
Full textKhoza, Dineo. "Topology optimization of plate-like structures." Diss., 2006. http://hdl.handle.net/2263/23910.
Full textDissertation (Master of Engineering)--University of Pretoria, 2007.
Mechanical and Aeronautical Engineering
unrestricted
Pudipeddi, Gnana Teja. "Quantitative Structural Diagnosis of Plate-like Structures using Multi-frequency Lamb Wave Diffraction Tomography." Thesis, 2019. http://hdl.handle.net/2440/123403.
Full textThesis (Ph.D.) -- University of Adelaide, School of Civil, Environmental and Mining Engineering, 2020
Gangadharan, R. "Structural Health Monitoring Of Thin Plate Like Structures Using Active And Passive Wave Based Methods." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/2102.
Full textKoper, Ewa Joanna [Verfasser]. "Differentiation of dendrites and the analysis of spine-like structures on lobula plate tangential cells in Drosophila melanogaster / vorgelegt von Ewa Joanna Koper." 2007. http://d-nb.info/984614338/34.
Full text