Dissertations / Theses on the topic 'Displacement-based analysis'
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Forsberg, Daniel, Mats Andersson, and Hans Knutsson. "Parallel Scales for More Accurate Displacement Estimation in Phase-Based Image Registration." Linköpings universitet, Medicinsk informatik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-59332.
Full textDemirel, Ismail Ozan. "A Nonlinear Equivalent Frame Model For Displacement Based Analysis Of Unreinforced Brick Masonry Buildings." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612772/index.pdf.
Full textSantos, Matheus Vilar Mota. "Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-03102018-122551/.
Full textCompósitos laminados estão sendo mais empregados como estruturas fundamentais devido ao seu baixo peso e alta rigidez. Um exemplo dessa inovação são as estruturas primárias das aeronaves modernas, que são mais leves do que as os materiais empregados antigamente. Prever a resposta do material à medida que a carga aumenta gradualmente pode ser difícil devido ao complexo mecanismo de falha dos compósitos. Portanto, modelos computacionais mais refinados devem ser investigados a fim de se prever um comportamento mecânico mais preciso. Esta dissertação aborda um procedimento de elementos finitos estendido baseado na teoria de deslocamento layerwise para simular falhas de delaminação modo I em laminados compósitos. O modelo abordado tem potencial para realizar análises em uma estrutura prédelaminada além de falha progressiva. O tipo de elemento a ser empregado na discrição do modelo é o isoparamétrico, homogêneo de 4 nós, retangular, e o campo de deslocamento é baseado na teoria layerwise. Existem quatro tipos de graus de liberdade, um deslocamento em cada direção, e um grau de liberdade associado à forte. Sugere-se nesse trabalho, exemplos, que são comparados com a bibliografia, e que apontam que o modelo desenvolvido nesta dissertação tem o potencial de simular o fenômeno de delaminação em modo I com acurácia, caso o estudo nessa dissertação seja estendido. Além disso, uma possibilidade de desenvolvimento futuro desse trabalho é a modelagem da fratura modo I sem a necessidade de discretizar os planos coesivos entre as lâminas, como realizado em métodos coesivos tradicionais.
Corob, Alexander Edward. "Analysis of Applied Modifications to a Cone Penetration Test-based Lateral Spread Displacement Prediction Model." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/9065.
Full textVoosoghi, Behzad. "Intrinsic deformation analysis of the earth surface based on 3-dimensional displacement fields derived from space geodetic measurements." [S.l. : s.n.], 2000. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8885017.
Full textAkinbami, Omolola Adetola. "Use of multiple displacement amplification based approaches for detection and analysis of environmentally significant and contaminating bacteria in fresh water." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602407.
Full textOsswald, Gustav. "Vibration analysis for predictive maintenance of a rotary pump : Optimal accelerometer configuration based on vibration analysis for cavitation detection of a bi-winged positive displacement pump." Thesis, KTH, Mekatronik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259903.
Full textPrediktivt underhåll baserat på tillståndsövervakning använder sensorer och systemdata för att förhindra skador, innan fel uppstår, vilket möjliggör att schemalägga en service vid en optimal tidpunkt. Tillståndsbaserat prediktivt underhåll estimerar tidpunkten för när fel uppstår i system baserat på a-priori information, som har visats vara mycket mer kostnadseffektiv än traditionella underhållningsmetoder. Typiskt finns tillämpningar där vardera av underhållsmetoderna, reaktivt-, förebyggande- eller prediktivt underhåll kan vara bäst lämpade. De dyra driftstoppen inom industri har lett till fokus på utveckling av prediktiva underhållsmetoder som ofta är ansett som den optimala lösningen i dessa förhållanden. För att en prediktiv algoritm ska kunna utvecklas krävs djup kunskap om systemet och stor mängd data att basera en algoritm på. Projektet fokuserar på vibrationsanalys och tillståndsövervakning av maskinen AkzoNobel - intelliCURE strängspridare som används i lamell- och balkindustrin. Forskningen är specifikt inriktad mot att upptäcka kavitation i transportpumparna som används i applikationen, där kavitation är ett relativt vanligt förekommande destruktivt fenomen som uppstår i pumpar. Kavitation, som är formandet och implosion av håligheter i vätska, leder till chockvågor som resulterar i vibrationer. Beroende på intensitet av förekommande kavitation, så kan det i tid leda till interna skador och resultera i läckage. Typen och intensiteten av förekommande kavitation i systemet är beroende av rotationshastigheten, som leder till lägre vibrationsgrad för lägre hastigheter. Där låg vibrationsintensitet presenterar utmaningar i mätbarhet. För att detektera den låga graden av vibrationer innan allvarlig kavitation utvecklas måste en optimal lösning för mätbarhet användas. Därav undersöker denna forskning en optimal lösning för att upptäcka kavitation med hjälp av accelerometerkonfiguration baserat på sensorplacering och sensortyp samt hur det relaterar till pålitlighet. Resultatet från studien visar att mätbarheten av vibrationerna som uppstår vid lägre hastigheter är bättre än vad som rekommenderas som gräns för användandet av vibrationsanalys på industriella applikationer. Samt att positionen och typen av sensor resulterar i olika möjligheter att detektera kavitation vid låga pumphastigheter. En optimal lösning hittades för det specifika användningsområdet av en dubbelvingad vingrotorpump som studien applicerades på.
Linz, Sarah [Verfasser], Alexander [Akademischer Betreuer] Kölpin, Peter [Gutachter] Knott, and Wolfgang [Gutachter] Heinrich. "Impairment analysis and their calibration techniques for Six-port based displacement sensors / Sarah Linz ; Gutachter: Peter Knott, Wolfgang Heinrich ; Betreuer: Alexander Kölpin." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2019. http://nbn-resolving.de/urn:nbn:de:bvb:29-opus4-131427.
Full textLinz, Sarah Verfasser], Alexander [Akademischer Betreuer] [Kölpin, Peter [Gutachter] Knott, and Wolfgang [Gutachter] Heinrich. "Impairment analysis and their calibration techniques for Six-port based displacement sensors / Sarah Linz ; Gutachter: Peter Knott, Wolfgang Heinrich ; Betreuer: Alexander Kölpin." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2019. http://d-nb.info/1204257922/34.
Full textHolst, Thomas Arthur. "Analysis of spatial filtering in phase-based microwave measurements of turbine blade tips." Thesis, Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-05192005-165732/.
Full textLittles, Jerrol W. Jr., Committee Member ; Johnson, W. Steven, Committee Member ; Kurfess, Thomas R., Committee Chair ; Melkote, Shreyes N., Committee Member.
Singh-Levett, Ishan. "Real-time integral based structural health monitoring." Thesis, University of Canterbury. Mechanical Engineering, 2006. http://hdl.handle.net/10092/1171.
Full textCcahuana, Nieto Willians Joseph, and Aguilar Juan Alejandro Coronel. "Análisis sísmico comparativo entre un edificio de placas de concreto armado y una edificación de pórticos de acero a través del Diseño Directo Basado en Desplazamientos." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/653692.
Full textMany cities in Peru are located in the Pacific ring of fire, consequently, there is a greater probability of earthquakes that generate large losses of life and great economic damage. Due to this problem, civil engineering is obliged to investigate new more accurate seismic designs, which originated several methods that use the displacements of the structure as the main parameter, since through the displacements the moments and shear of the structure can be obtained. This method is known as Displacement Based Design. The author who gave the broadest and most consistent theoretical guidelines is Priestley, with his proposal called Direct Displacement Based Design. On the other hand, in the Peruvian reality, steel frames buildings system are atypical compared to those of the dual wall-frame with reinforced concrete system. Consequently, the properties of this material and this structural system are wasted, which is more immersed in the inelastic range than concrete. The thesis will analyze the results obtained from the seismic analysis of a dual wall-frame building and another of steel frames, both with the same architectural configuration, under the Direct Displacement Based Design method and the Design Based Force method, which is the method used in most standards. The thesis will generate the comparison between the structural systems under the mentioned methodologies.
Tesis
Karlsrud, Kjell. "Prediction of load-displacement behaviour and capacity ofaxially loaded piles in clay based on analyses and interpretation of pile load test results." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bygg, anlegg og transport, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-17071.
Full textWei, Guoqiang. "Towards overall adaptive modeling based on solid-shell and solid-beam approaches for the static and dynamic finite element analysis of structures." Thesis, Compiègne, 2021. https://bibliotheque.utc.fr/Default/doc/SYRACUSE/2021COMP2618.
Full textThe finite element method has been widely used since the 1970s to predict the behavior of structures such as automobiles, airplanes, machines, bridges or buildings. The modeling choices are essential to build a representative model and control the number of degrees of freedom. Many works have sought to optimize the model from a mesh point of view, namely by proposing adaptive meshing techniques. On the other hand, concerning the theory choice, seldom work has been carried out to obtain an optimal finite element model. In the context of static and vibratory linear analysis, this thesis aims to propose an adaptive modeling methodology in order to obtain an optimal finite element model from the theory choice point of view. The mesh, composed only of solid elements, is refined at each iteration of the methodology. An appropriate choice between beam, shell and 3D elasticity theories is made on each finite element of the model at each analysis. In areas where beam or shell theories are relevant, specific displacement fields are applied. New solid-shell and solid-beam approaches, based respectively on shell theory and beam theory, have been developed for this purpose. For each of these two approaches, first-order and higher-order theories are proposed. In these areas, the application of kinematic relations at nodes of the solid mesh, by using linear equations, leads to a reduction of the number of degrees of freedom. In the context of static and vibratory analysis, several examples are treated to evaluate the methodology of adaptive modeling. The numerical results obtained are always very close to those of a reference solid model and the adaptive modeling method leads to a significant reduction in the model size
Harris, John Leroy. "Seismic analysis and design of type FR steel frames using displacement-based design and advanced analysis." 2002. http://www.lib.ncsu.edu/theses/available/etd-08252002-154318/unrestricted/etd.pdf.
Full textSie, Qing-Yu, and 謝謦羽. "Optimization Design of a Compliant Displacement Amplification Mechanism Using Taguchi Method Based Grey Relational Analysis." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/u9t44d.
Full text國立高雄應用科技大學
機械工程系
106
In this thesis, Taguchi quality design is applied and the gray relational method is used to explore the optimal design of the hinge of flexible mechanism applied in the displacement magnification mechanism. In the study, three models of flexible hinges and displacement amplifying mechanisms with different geometric shapes were established by using SolidWorks drawing software, and an appropriate force was applied as a force to simulate the finite element analysis software ANSYS Workbench and find out through Taguchi quality design. The best combination of the parameters of the displacement amplification mechanism and the influencing factors on the quality characteristics are used as the best solution to predict the combination of the various factors. Then the analysis of variance and the interaction check are carried out to ensure the correctness of the prediction. The gray correlation method was used to integrate multiple optimal target to maximize efficiency, so, in the multi-quality design features to determine the best combination of conflict problems encountered will be resolved in order to get the best solution. The results show that the optimization method of this study can obviously integrate the overall quality of the displacement and look at the characteristics of low-stress and low-quality. The best combination of parameters for the aluminum alloy material, the hinge length of 5 mm opening, the geometry S-type, the hinge thickness of 0.3 mm, the material thickness of 5 mm, and the hinge opening 10 mm, is conformed with the verification results. Also meet the expected goals and can successfully solve the conflict between multi-objective quality characteristics to achieve the best combination of both displacement and contingency.
王憲龍. "Simulations and analysis of measurement of small displacement based on multiple total internal reflections and heterodyne interferometry." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/67382422102716686056.
Full text國立彰化師範大學
機電工程學系
96
In this thesis, a method for measuring small displacements is presented based on the phenomenon of multiple total-internal reflections and heterodyne interferometric technique. The optical system of our method consists of a heterodyne light source, piezoelectric translator (PZT), a semi-sphere glass, a parallelogram prism, and some optical components. A heterodyne light beam reflected from the PZT passes through the center of the semi-sphere glass and impinges on the parallelogram prism. The beam is guided within the prism due to total-internal reflection. When the PZT generates a small displacement, the output beam from a semi-sphere glass is deflected. Therefore, the phase difference between the p- and s- polarization of the beam coming from the parallelogram prism is apparently changed. The variation of the phase difference can be measured accurately with heterodyne interferometry. The result, then, is fed into the derived equation, and the displacement can be estimated. This study also discusses the relations among the small displacement and the operated conditions of some optical components of the apparatus with numerical analysis software (Matlab). According to the simulation results, the measurable range of this method is up to ± 0.96 μ m, and its sensitivity up to 0.045 degree / nm. Because of its common-path configuration, this method possesses high stability and high precision.
Lu, Hsiu-Chen, and 盧脩塵. "Displacement Analysis of a Two-Wire-Driven Continuum Robot with a Contacted Obstacle based on Neural Network Model." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/53vy75.
Full text國立臺灣科技大學
機械工程系
106
Continuum robot becomes more and more popular in recent years. Displacement analysis is necessary to find the position of continuum robots. In robot control, there are a lot of researches on path planning and how to bypass the obstacle. There are also many methods can be used to analyze the displacement of continuum robots like geometry models and beam theory models. These methods can also solve the kinematics problem about continuum robot with end loads. However, there is no research about what will happen when a continuum robot contacts an obstacle and keep going. Therefore, the purpose of this thesis is analyzing displacement of a continuum robot with a contacted obstacle. The geometry models are too simple, some of the beam theory models are too complicated, and some cannot solve this problem. Afterward, the neural network model is chosen to analyze displacement of continuum robot with contacted obstacle although there is no research about displacement analysis using a neural network model. By using the neural network model, the user only needs to decide what are the input data, the target data, and then do some experiments to get data. These data would be used to train the neural network model. After that, a trained model would be produced. The trained neural network model will output the position and orientation of the end-effector of the robot in a short time.
Voosoghi, Behzad [Verfasser]. "Intrinsic deformation analysis of the earth surface based on 3-dimensional displacement fields derived from space geodetic measurements / submitted by Behzad Voosoghi." 2000. http://d-nb.info/960401318/34.
Full textVaculik, Jaroslav. "Unreinforced masonry walls subjected to out-of-plane seismic actions." Thesis, 2012. http://hdl.handle.net/2440/77089.
Full textThesis (Ph.D.) -- University of Adelaide, School of Civil, Environmental and Mining Engineering, 2012
Μπαρδάκης, Βασίλειος. "Αντισεισμικός σχεδιασμός γεφυρών σκυροδέματος με βάση τις μετακινήσεις." Thesis, 2007. http://nemertes.lis.upatras.gr/jspui/handle/10889/774.
Full textThe majority of seismic design researchers/specialists concludes that displacement-based design methodologies reduce the uncertainty of the design process and probably lead to less expensive structures. The absence of a simple displacement-based seismic design procedure for bridges that will be feasible and compatible with the current design practice and the nonexistence of a proposal for the displacement-based design of the deck indicate the gap of knowledge in this field of earthquake engineering. This thesis attempts to contribute to the reduction of this gap and for this scope proposes a new methodology. The procedure focuses on bridges with concrete piers monolithically connected to a prestressed concrete continuous deck and comprises simple steps for the estimation of the inelastic/nonlinear deformations of both the piers and the deck - through elastic modal response spectrum analysis, extending the applicability of the "equal displacement" rule to the level of member deformations. About two thousands nonlinear dynamic (time-history) analyses of several representative bridges (with deck of three or five spans) are used for the development and the calibration of the procedure. However, for the application of the methodology only elastic modal response spectrum analysis is needed. Contrary to other current researches, which adopt the hypothesis of deck elastic response, the nonlinearities of the deck are modeled. The proposed displacement-based procedure offers lower reinforcement ratios (from 1/2 to 1/7 for the longitudinal reinforcement and from 1/1 to 1/3 for the transverse reinforcement) at no detriment to the expected seismic performance - the global overstrength of the bridges which are designed with the proposed procedure is practically equivalent to the global overstrength of the conventionally designed bridges (current force-based design). The step by step description of the design algorithm (Chap. 2) is followed by the practical application of the methodology (modeling aspects, design examples: Chap. 3), the conceptual justification (Chap. 4), the deficiencies of the conventional design procedure (force-based design examples: Chap. 3) and the fallacies in the justification of the conventional design methodology (Chap. 4). Comparative performance-based design evaluation (Chap. 3) of sixteen representative bridges (eight bridges subjected to alternative seismic design) indicates the benefits of the proposed procedure. The computational capabilities which were developed for the modeling and the analysis of the bridges are described in the appendices (upgrade of program ANSRuop).
VLACHOPOULOS, NICHOLAS. "Back Analysis of a Tunnelling Case Study in Weak Rock of the Alpine System in Northern Greece: Validation and Optimization of Design Analysis Based on Ground Characterization and Numerical Simulation." Thesis, 2009. http://hdl.handle.net/1974/5116.
Full textThesis (Ph.D, Geological Sciences & Geological Engineering) -- Queen's University, 2009-09-01 08:46:30.537