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Dissertations / Theses on the topic 'Modal analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Potgieter, Brendon Ryan. "Experimental modal analysis and model validation of antenna structures." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5423.

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Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Numerical design optimisation is a powerful tool that can be used by engi- neers during any stage of the design process. Structural design optimisation is a specialised usage of numerical design optimisation that has been adapted to cater speci cally for structural design problems. A speci c application of structural design optimisation that will be discussed in the following report is experimental data matching. Data obtained from tests on a physical structure will be matched

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2

Kolhatkar, Shashank C. "Modal analysis of a robot arm using the finite element analysis and modal testing /." Online version of thesis, 1989. http://hdl.handle.net/1850/10623.

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3

Lanier, Prather Jonathan. "Stereovision Correction Using Modal Analysis." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/31662.

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Presently, aerial photography remains a popular method for surveillance of landscapes, and its uses continually grow as it is used to monitor trends in areas such as plant distribution and urban construction. The use of computer vision, or more specifically stereo vision, is one common method of gathering this information. By mounting a stereo vision system on the wings of an unmanned aircraft it becomes very useful tool. This technique however, becomes less accurate as stereo vision baselines become longer, aircraft wing spans are increased, and aircraft wings become increasingly flexible. Ty

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4

McDonald, Steven. "Operational modal analysis, model updating, and seismic analysis of a cable-stayed bridge." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/56633.

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The Port Mann Bridge is currently one of the longest cable-stayed bridges in North America and the second widest bridge in the world. It is a cable-stayed bridge consisting of 288 cables, two approach spans made of concrete box girders and precast deck panels, and a main span consisting of steel girders and cross beams with precast deck panels. This work sets out to accomplish three main goals: study the dynamic behaviour of the Port Mann Bridge, calibrate the finite element model, and study the effects of model updating using a seismic analysis. The dynamic behaviour of the Port Mann Bridge’s

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5

Hanson, David Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Operational modal analysis and model updating with a cyclostationary input." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2006. http://handle.unsw.edu.au/1959.4/31199.

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This thesis addresses the problem of identifying the modal properties of a system based only on measurements of the system responses. This situation is frequently encountered in structural dynamics and is particularly relevant for systems where the in-service excitation is not artificially reproducible. The inherent non-linearities in these systems mean that the modal properties estimated using traditional input/output techniques will be different to those exhibited in operation. A common example from the literature is an aircraft in flight where the modal properties are heavily influenced by

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6

Wicks, Matthew L. "A modal analysis method for a lumped parameter model of a dynamic fluid system." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07292009-090406/.

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7

Gutierrez-Wing, Enrique Simon. "Modal analysis of rotating machinery structures." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409293.

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8

Chan, Kin Lung. "Modal analysis of elliptic waveguide junctions." Thesis, University of Hull, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389728.

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9

Mahdi, Hassan Hamoodi. "Vibrational modal analysis of rotating machines." Thesis, University of Hertfordshire, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303391.

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10

Archibald, Charles Mark. "Parametric spatial modal analysis of beams." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/37278.

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Modal analysis is the experimental characterization of the dynanlical behavior of a structure. Recent advances in laser velocimetery have made available to the experimentalist a rich, new source of vibration data. Data can now be obtained from many different spatial locations on a structure. A method is presented to use this new data for the analysis of beams. Two approaches are investigated: minimum residual methods and boundary condition methods. The minimum residual approaches include autoregressive methods and non-linear least squares techniques. Significant contributions to sample rate co

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11

You, You, and Daxin Chen. "Modal Analysis on a MIMO System : For an asphalt roller CC1200." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-10998.

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Impact hammer is the current modal testing way in Dynapac testing department. Due to highly damped characteristic of big construction machines, there are a few weaknesses for modal testing when using hammer, such as short response time, limited frequency resolution, poor quality of frequency response functions. Therefore, a more advanced excitation equipment is needed to improve the measurement quality. The object for this study is to compare two different measuring methods. The thesis will show a comparison between the hammer testing and the shaker MIMO testing compared with analytical model

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12

Aluri, Srinivas. "Updating low-profile FRP deck FE model using experimental modal analysis." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4656.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains vi, 76 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 60-61).

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13

Baldwin, Mark W. "Modal Analysis Techniques in Wide-Area Frequency Monitoring Systems." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26522.

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The advent of synchronized wide-area frequency measurements obtained from frequency disturbance recorders and phasor measurement units has presented the power industry with special opportunities to study power system dynamics. I propose the use of wide-area frequency measurements in identifying system disturbances based on power system post-event modal properties. In this work, power system dynamics are examined from an internal system energy viewpoint. Since an electric power system is composed of coupled rotating machines (large generators) which have air gap magnetic fields that are essent

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14

Serbichenko, Daria. "Modal analysis of time-dependent structures using Derictional Derivatives." Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0059.

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Dans un grand nombre de domaines, l'analyse modale de structures est une composante capitale du dimensionnement. Pour l'identification des fréquences et modes propres, les logiciels de calcul éléments finis sont maintenant souvent utilisés et offrent des réponses rapides et satisfaisantes dans une grande majorité de cas. Cependant, lorsqu'une structure possède une géométrie qui varie au cours du temps ou alors lorsqu'une fissure se propage dans cette structure, les méthodes classiques employées peuvent être contraignantes et consommatrice de temps CPU (remaillage, résolution itérative de probl

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15

Zhou, Wenliang. "Multivariate analysis in vibration modal parameter identification /." View online ; access limited to URI, 2006. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3248248.

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16

Saad, Mohamed Shawky. "Problems in selective modal analysis and control." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/6882.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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17

Thurston, Michael G. "Modal analysis of a computer disk drive /." Online version of thesis, 1988. http://hdl.handle.net/1850/10139.

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18

Zheng, Ming M. Eng Massachusetts Institute of Technology. "Modal pushover analysis for high-rise buildings." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82829.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 50).<br>Pushover analysis is a nonlinear static analysis tool widely used in practice to predict and evaluate seismic performance of structures. Since only the fundamental mode is considered and the inelastic theorem is imperfect for the conventional pushover analysis, a modified Modal Pushover Analysis (MPA) is proposed by researchers. In this thesis, the theories of dynamics for single-degree-o

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19

Martell, Raymond F. "Investigation of Operational Modal Analysis Damping Estimates." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1291147391.

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20

Busseti, Gabriele. "Modal and Fatigue Analysis of the Stratotimer." Thesis, KTH, Lättkonstruktioner, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-262042.

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Fatigue analysis of the printed circuit boards (PCBs) of an avionic instrument has been analyzed. The natural frequency and transmissibility has been estimated through analytical approach and finite element approach with Solid- Works and experimentally. Fatigue analysis damage has been obtained with three methods: Steinberg Stress approach, Steinberg Relative Displacement approach and Dirlik method. The analysis indicates that the solder that holds the CPU on the control unit is critical for the fatigue life. The results show that each method is far from the critical CDI value of 0:7 and there

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21

Drexel, Michael V. "Modal parameter identification using mode isolation." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17239.

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22

Zhou, Shi Huang. "Operational modal decomposition approach for MDOF structures using multi-channel response measurements." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3950681.

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23

Buke, Fatih. "An Investigation On The Application Of Operational Modal Analysis." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607529/index.pdf.

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Modal parameter identification of a structure is done through modal testing and modal analysis using various system identification methods. These methods employ linear input-output relationships to extract the modes of a structure. There are cases where laboratory testing of a structure is not possible or information about the structure under operating conditions is seeked. A set of techniques called Operational Modal Analysis have been developed for modal parameter identification in operating conditions of a structure. These techniques use only response measurements to extract the modes. The

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24

Swaminathan, Balakumar. "Operational Modal Analysis Studies on an Automotive Structure." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1277155789.

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25

Marudachalam, Kannan. "An attempt to quantify errors in the experimental modal analysis process." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-08142009-040508/.

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26

Kaya, Huseyin. "Experimental Modal Analysis Of A Steel Grid Frame." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12604710/index.pdf.

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In this study, experimental modal analysis was studied. Experimental modal analysis includes modal testing, modal parameter estimation and calibration. For this purpose a 4 span skewed steel frame was constructed in Structural Mechanics Laboratory of Civil Engineering Department of METU. The model was transported to Vibration and Acoustic Laboratory of Mechanical Engineering Department of METU. The tests were conducted by cooperation with Vibration and Acoustics Laboratory. Due to lack of experimental modal analysis software in Structural Mechanics Laboratory, modal parameter estimation and fi

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27

Shimizu, Kenji. "Application of modal analysis to strongly stratified lakes." University of Western Australia. Faculty of Engineering, Computing and Mathematics, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0079.

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Modal analysis for strongly stratified lakes was extended to obtain a better understanding of the dynamics of the basin-scale motions. By viewing the basin-scale motions as a superposition of modes, that have distinct periods and three-dimensional structures, the method provides a conceptual understanding for the excitation, evolution, and damping of the basin-scale motions. Once the motion has been decomposed into modes, their evolution and energetics may be extracted from hydrodynamic simulation results and field data. The method was applied to Lake Biwa, Japan, and Lake Kinneret, Israel, an

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28

Shen, Zhongxiang. "Modal expansion analysis of monopole and microstrip antennas." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0009/NQ30645.pdf.

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29

Elizalde, Siller Hugo Ramon. "Non-linear modal analysis methods for engineering structures." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419886.

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30

Johnston, Mark. "Static and modal analysis of wind turbine towers." Thesis, De Montfort University, 1999. http://hdl.handle.net/2086/4184.

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31

Wake, Richard Neil. "Detection of cracks in cylinders using modal analysis." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321302.

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32

Eow, Andy Khai Siang. "Quantitative multi-modal analysis of pediatric focal epilepsy." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34110.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.<br>Includes bibliographical references (p. 101-103).<br>For patients with medically refractive focal epilepsy, surgical intervention to remove the epileptic foci is often the last alternative for permanent cure. The success of such surgery is highly dependent on the doctor's ability to accurately locate the epileptogenic region during the pre-surgical planning and evaluation phase. Hence the goal of this project is to provide an end-to-end quantitative analysis pipeline that fuses

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33

Yamashita, Nelson N. "Modal analysis of a cylindrical dielectric-loaded cavity." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14832.

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34

Hall, Melissa A. "Characterization of Vibration Test Fixtures using Modal Analysis." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627664784639955.

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35

Venturella, Michael Anthony. "Modal Analysis of the Ice-Structure Interaction Problem." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31749.

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In the present study, the author builds upon the single degree of freedom ice-structure interaction model initially proposed by Matlock, et al. (1969, 1971). The model created by Matlock, et al. (1969, 1971), assumed that the primary response of the structure would be in its fundamental mode of vibration. In order to glean a greater physical understanding of ice-structure interaction phenomena, it was critical that this study set out to develop a multi-mode forced response for the pier when a moving ice floe makes contact at a specific vertical pier location. Modal analysis is used in which

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36

Davis, Ivan Christopher. "Damage Detection in Aluminum Cylinders Using Modal Analysis." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/34317.

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Many studies have attempted to detect structural damage by examining differences in the frequency response functions of a structure before and after damage. In an experimental setting, this variation can not be attributed solely to the addition of damage. Other sources of variation include testing and structure variation. Examples of testing variation include the error introduced by modal parameter extraction, measurement noise, and the mass loading of the accelerometer. Structure variability is due to slight differences in the supposedly identical structures. Dimensional tolerancing is o

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37

Prater, Glen. "Complex modal analysis of nonproportionally damped continuous beams /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu14875974241363.

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38

Uwajambo, Pacifique, and Nisha Thakur. "Numerical and Experimental Modal Analysis of CNC Machine." Thesis, Blekinge Tekniska Högskola, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21652.

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Numerical and Experimental Modal Analysis of RAW CNC milling machine was performed in this project. The RAW CNC machine's lightweight, easy assembling, and operation features make it a good choice for hobbyists and professionals. As the machine is subjected to vibration during the milling process, the work is intended to study the machine's dynamic behaviour through Finite Element Method (FEM) in the first stage, followed by validating it with Experimental Modal Analysis (EMA). The simulation and experimentation are focused on X and Y-axis. In the first stage, the inventor model of the machine

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39

Tremaine, Kellie Michelle. "MODAL ANALYSIS OF COMPOSITE STRUCTURES WITH DAMPING MATERIAL." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/823.

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The purpose of this study is to develop an analytical solution for modal analysis of actively damped orthotropic composite plates in bending and to verify it with experimental analysis. The analytical modal analysis solution for composite plate dynamics is derived using Euler theory. This analysis applies to structures with orthotropic lamina of uniform material properties at any lamination angle. The bending-extensional coupling can be neglected for plates that are symmetric or approximately symmetric, which allows an exact solution for natural frequency and mode shape to be obtained. An exac

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40

XHIXHA, ELONA. "PASSIVE METHOD FOR DYNAMIC CHARACTERIZATION OF SOIL AND BUILDINGS." Doctoral thesis, Università di Siena, 2017. http://hdl.handle.net/11365/1013203.

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The research followed consist mainly on the use of passive methods for dynamic characterization of soil and building. Local Seismic Response of the construction site and Calibration of FE model of a reinforced concrete building have been performed. Passive seismic measurements have been acquired by two portable seismographs synchronized by each other with GPS antenna. Subsequently, structural verifications (global structural response) have been realized using once the response spectrum estimated from Local Seismic Response and once from technical standards. Finally, confronts between results h

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41

Wang, Yaolun. "Vibrational measurement techniques applied on FE-model updating." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45213.

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In this thesis, the dynamics of two plates overlapping and connected by three bolts are studied. The data collected in the test are used in modal analysis. The vibrational test and the modal analysis were made using an LMS system. Hammer excitation is used for the tests. The main purpose of this thesis is to study how the suspensions affect the extracted eigenfrequencies and modal dampings. In this thesis, more than 10 suspensions were examined. Another objective in this thesis work is to build an FE-model. This model is made using the software Abaqus. To improve the reliability of the FE-mode

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42

Altunel, Fatih. "Model Updating Of A Helicopter Structure Using A Newly Developed Correlation Improvement Technique." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12611300/index.pdf.

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Numerical model usage has substantially increased in many industries. It is the aerospace industry that numerical models play possibly the most important role for development of optimum design. However, numerical models need experimental verification. This experimental verification is used not only for validation, but also updating numerical model parameters. Verified and updated models are used to analyze a vast amount of cases that structure is anticipated to face in real life. In this thesis, structural finite element model updating of a utility helicopter fuselage was performed as a case s

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43

Tbaileh, Ahmad Anan. "Power System Coherency Identification Using Nonlinear Koopman Mode Analysis." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/49261.

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In this thesis, we apply nonlinear Koopman mode analysis to decompose the swing dynamics of a power system into modes of oscillation, which are identified by analyzing the Koopman operator, a linear infinite-dimensional operator that may be defined for any nonlinear dynamical system. Specifically, power system modes of oscillation are identified through spectral analysis of the Koopman operator associated with a particular observable. This means that they can be determined directly from measurements. These modes, referred to as Koopman modes, are single-frequency oscillations, which may be ext

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44

Moloney, Christopher W. "Visual and analytical characteristics for the identification of complex modes." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/16337.

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45

Zaki, Bassem R. "A modified approach to improve the robustness of the algorithm of mode isolation." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17563.

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46

Mendonça, Willy Roger de Paula [UNESP]. "Estudo e implementação do método de Ewins-Gleeson para identificação de parâmetros modais." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/97093.

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Made available in DSpace on 2014-06-11T19:28:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-12Bitstream added on 2014-06-13T19:37:17Z : No. of bitstreams: 1 mendonca_wrp_me_guara.pdf: 1680697 bytes, checksum: bcb5ba9c7460283227da43d67a5ca331 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Estruturas e máquinas em regime operacional usualmente são submetidas a carregamentos dinâmicos ocasionados por vibração. Este fenômeno é em grande parte prejudicial, tendo em vista que podem causar falhas por fadiga, ruídos indesejáveis, etc. Com objetivo de minim

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Rossetto, Gustavo Dalben. "Contribuição a teoria e pratica da analise modal acustica experimental." [s.n.], 2001. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265319.

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Orientador: Jose Roberto de França Arruda<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-07-31T18:15:00Z (GMT). No. of bitstreams: 1 Rossetto_GustavoDalben_M.pdf: 4484828 bytes, checksum: b149e9723524115d4c39c2ea81d0c5bc (MD5) Previous issue date: 2001<br>Resumo: Neste trabalho uma geometria simples (cavidade retangular) é usada para o estudo da metodologia aplicada na análise modal acústica. Modelos analítico e numérico são desenvolvidos para a comparação com os resultados experimentais. Três tipos de dispo

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48

Wang, Zhenhong. "Power flow analysis of engineering structure using substructure techniques." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270373.

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49

Peng, Ya-Yi, and 彭爗毅. "The Manufacturing and Modal Analysis of Micro Electrostatic Modal Actuators." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/39977842756443862338.

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碩士<br>華梵大學<br>機電工程研究所<br>93<br>A novel electrostatic micro modal actuator adopted the orthogonality of the mode shape of the microstructure is created. By using the design of the shape of the modal electrode, the stability of the actuator can be improved and the driving voltage can be reduced by controlling the actuated modes precisely. In the analysis in this investigation, the equations of motion considering the effect of the coupling between the flexibility and the electrostatic field of the micro actuator are developed. The modal equations derived by the modal expansion indicate that distr

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50

Lou, Jr-Cheng, and 盧志誠. "Modal Analysis of Ring Gyroscope." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/32321031944747373417.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>97<br>Research of Gyro has been developed for many years. It is used on airplane、ship and satellite for military affairs a long time ago then now it is applied to car or game industry and kinds of gyro evolved from rotor gyro into vibrating gyro or fiber gyro. The paper primarily study vibrating gyro because that can improve restrictions of rotor gyro including life and time of switch. There are all kinds of vibrating gyro include tuning fork gyro, rod gyro and hemispheres, and in this paper, the study main apply metallic ring which is driven and sense by piezoel

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