Dissertations / Theses on the topic 'Beam method'
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Quiroga, Gonzáles Cruz Sonia, Juan Límaco, and Rioco K. Barreto. "The penalty method and beam evolution equations." Pontificia Universidad Católica del Perú, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/96079.
Full textMenard, Kenneth A. "Gaussian beam resonator formalism using the yy method." Master's thesis, University of Central Florida, 1995. http://digital.library.ucf.edu/cdm/ref/collection/RTD/id/21214.
Full textA simple and powerful new paraxial ray formalism is shown to provide an alternate method for designing Gaussian Beam Resonators. The theory utilizes the Delano yybar diagram approach and is an extensio of the recent work by Shack and Kessler for laser systems. The method is shown to be complementary to the conventional ABCD method and is founded upon J.A. Arnaud's pioneering ideas for complex rays. The thesis develops an analytic formulation of a ray based complex wavefront curvature and yields a clearly generalized description of spherical wave propagation, for which Gaussian beams are considered a special case. The resultant theory unifies the complex q parameter and the ABCD law, with the yybar complex ray components and also suggests that the ABCD law for the complex q parameter has its origin in the yybar complex ray. New fundamental equations for designing stable multi-element resonators using the yybar coordinates are derived, and it is shown that the yybar diagram provides a novel method for defining automatically stable resonators. Various applications for the yybar design technique are also discussed, including the setting of convenient design constraints, the description of M2 beams, generating phase diagrams, and resonator syntheis and analysis.
M.S.;
Electrical Engineering
Engineering;
Electrical Engineering
49 p.
vii, 49 leaves, bound : ill. ; 28 cm.
Liu, Deyun. "Advances in beam propagation method for facet reflectivity analysis." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13491/.
Full textHuq, Syed Ejazul. "Thin film deposition by the ionized cluster beam method." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304288.
Full textSager, Benay. "A method for understanding and predicting stereolithography resolution." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/17832.
Full textLidgate, Simon. "Advanced finite difference - beam propagation : method analysis of complex components." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408596.
Full textWang, Fei. "Vertical beam emittance correction with independent component analysis measurement method." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3319892.
Full textTitle from PDF t.p. (viewed on May 13, 2009). Source: Dissertation Abstracts International, Volume: 69-08, Section: B, page: 4823. Adviser: Shyh-Yuan Lee.
Chen, Yong. "Ultimate Strength Analysis of Stiffened Panels Using a Beam-Column Method." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/26000.
Full textPh. D.
Le, Thanh Nam. "Corotational formulation for nonlinear analysis of flexible beam structures." Licentiate thesis, KTH, Bro- och stålbyggnad, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-94880.
Full textQC 20120521
Le, Thanh-Nam. "Nonlinear dynamics of flexible structures using corotational beam elements." Doctoral thesis, KTH, Bro- och stålbyggnad, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-131701.
Full textQC 20131017
Gao, Hanhong. "Iterative nonlinear beam propagation method and its application in nonlinear devices." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/63077.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 89-96).
In this thesis, an iterative nonlinear beam propagation method is introduced and applied to optical devices. This method is based on Hamiltonian ray tracing and the Wigner distribution function. First, wave propagation simulation using Hamiltonian ray tracing is illustrated and verified with different examples. Based on this, the iterative method is presented for beam propagation in nonlinear media, which is validated with common Kerr effect phenomena such as self-focusing and spatial solitons. As the application to the analysis of nonlinear optical devices, this method is applied to nonlinear Lineburg lens. It is found that the nonlinear Liineburg lens is able to compensate the focal shift caused by the diffraction of Gaussian illumination. The iterative nonlinear beam propagation method is computationally efficient and provides much physical insights into the wave propagation. Since it is based on Hamiltonian ray tracing, a ray diagram can be easily obtained which contains the evolution of generalized radiances. Besides bulk nonlinear media, this method provides a systematic approach to beam propagation problem in complex media such as nonlinear photonic crystals and metamaterials. Also, it is applicable to both coherent and partially coherent illumination. Therefore, this method has potential applications in the design and analysis of nonlinear optical devices and systems.
by Hanhong Gao.
S.M.
Labuschagne, Anneke. "Finite element analysis of plate and beam models." Thesis, Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-12082006-135946.
Full text梁少江 and Siu-kong Leung. "Analysis of shear/core wall structures using a linear moment beam-typeelement." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31213352.
Full textEren, Ahmet M. "An Elastic-plastic Beam Element." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607162/index.pdf.
Full textSasinowski, Maciek. "A Delta-f Monte Carlo method to calculate parameters in plasmas." W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539623873.
Full textLe, Thanh Nam. "Nonlinear dynamics of lexible structures using corotational beam elements." Phd thesis, INSA de Rennes, 2013. http://tel.archives-ouvertes.fr/tel-00954739.
Full textAkman, Mehmet Nazim. "Analysis Of Thin Walled Open Section Tapered Beams Using Hybrid Stress Finite Element Method." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12609246/index.pdf.
Full textLeung, Siu-kong. "Analysis of shear/core wall structures using a linear moment beam-type element /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18155376.
Full textRivera, Michael 1968. "Bent waveguide analysis with a modified version of the beam propagation method." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/282158.
Full textStiernström, Vidar. "Numerical simulation of the Dynamic Beam Equation using the SBP-SAT method." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227121.
Full textMoussiaux, Eric. "Bending of a bonded beam as a test method for adhesive properties." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45759.
Full textMaster of Science
Ghorbanloo, Sepideh. "Localization of Cross-Junctions in Warehouse Beam Structure by Supervised Descent Method." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-30886.
Full textPopov, G. F., A. S. Salah, and R. V. Lazurik. "Verification of Two-Parametric Fitting Method for Determination of Electron Beam Characteristics." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41121.
Full textKavi, Sandeep A. "Nonlinear 3-D beam/connector finite element with warping for a glulam dome." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07102009-040624/.
Full textKunaporn, Chalitphan. "Probabilistic Analysis of a Thin-walled Beam with a Crack." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77072.
Full textPh. D.
CHEN, ZHAO-XIAN, and 陳昭先. "The discussion of beam propagation method." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/54925632371349394893.
Full textSu, Yu Wei, and 蘇昱維. "Buckling Analysis of Channel Beam with Warping Effect using Sub-Beam Method." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/50411629458724976778.
Full text國立臺灣海洋大學
河海工程學系
96
In this study, based on updated Lagrangian algorithm, we proposed the sub-beam method to solve the geometric-nonlinear virtual work equation. First, we must represent again the sectional force equilibrium equation of the rectangle beam including uniform load, six terms of nonlinear virtual strain energy caused by nonlinear strain and the incremental virtual work acted by external force, therefore, We can obtain the rectangle beam including uniform load geometric-nonlinear virtual work equation. The method was proposed by Yau(2006), but he abbreviate the nonlinear effect in each section and the virtual work of and non-linear strain energy of . This method in this study invested the channel shape which are decomposed to three sub-member of rectangular beam, and constructed the geometric nonlinear strain energy of each three sub-member. Finally, we composed the geometric nonlinear strain energy of channel shape by equilibrium and compatibility. In which, we can derive logically the sub-beam moment in state and define correctly bi-moment in state and the second order incrementally virtual work in .We also completely deal with the nonlinear effect caused by each sub-beam and the virtual work in and the nonlinear strain energy in . So we can obtain the geometric nonlinear virtual work equation which composed of each rectangular beam if only we construct the relation between force of sub-beam and displacement of sub-beam, and derive colrrectly the sub-beam moment in state and define bi-moment in state and virtual work in .
Cai, Zhang-Rong, and 蔡長榮. "Method improvement for assembling beam and slab rebars." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/18743930500842386523.
Full textTsai, Tsang-Zong, and 蔡長榮. "METHOD IMPROVEMENT FOR ASSEMBLING BEAM AND SLAB REBARS." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/85899902139979272176.
Full text國立臺灣科技大學
營建工程技術學系
82
Rebar assembly is a labor intensive work item in reinforced concrete building construction. Work sampling, flow process charting, crew balance analysis and time study methods are applied to identify problems of current rebar assembly methods. Using beam and slab rebar assembly as examples, a laboratory experimentation approach is utilized to explore potential benefit of pre assembly methods. Results show that total construction time, safety, quality, and skill labor requirement can be improved drastically through rebar pre-assembly methods.
Cheng, Chao-Lin, and 鄭兆麟. "Curvature Ductility Design Method for RC Beam Section." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/07505361238882063286.
Full text華梵大學
建築學系碩士班
101
This research established a flexural strength and curvature ductility design method for reinforced concrete (RC) beam section, designated as RCSD method. In RCSD method, a relationship between the position of neutral axis (c) and the curvature ductility ratio (μcr) was refined and used at first. And then, according a curvature ductility requirement it finds out a limited position of neutral axis, named cL. For RC beam section design, if c ≦ cL, the curvature ductility requirement will be satisfied. Following this design concept, it develops the RCSD method. The accuracy and applicability of the RCSD method was verified by designing 432 sections and comparing the required moment and ductility capacities with the provided moment and ductility capacities of the designed sections. It was found that the proposed design method has good control of moment and curvature ductility capacities of the RC beams designed. This is able to provide designers a tool for designing RC beam sections to fulfill both the flexural strength and designated curvature ductility ratio demands. The RCSD method is fairly simple and accurate. Consequently, sections designed according to RCSD method are provided economical. And, the RCSD method fairly well control on the ductility of designed sections.
Chou, Shun-Yu, and 周舜虞. "Geometric-Nonlinear Analysis of Thin-Walled Beam with Warping Effect using Sub-Beam Method." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/82930756917357581194.
Full text國立臺灣海洋大學
河海工程學系
95
In this study, based on updated Lagrangian algorithm, we proposed the sub-beam method to derive the geometric-nonlinear virtual work equation of the I shape beam and channel shape beam . The sub-beam method is to start with decomposing to three members of rectangular beam, then constructs the geometric nonlinear strain energy of each three members. Finally, we composed the geometric nonlinear strain energy of I shape and channel shape by equilibrium and compatibility. The completely sub-beam method, we construct in this study, is to solve the geometric nonlinear incremental virtual work equation of the rectangular sub-beam containing the uniform load. By the virtual work equation, we can deal with the nonlinear effect caused by the uniform load in the border of each sub-beam. Then we define logically the sub-beam moment in 2C state and bi-moment in 2B state, and we derive the nodal moment in 2C state and nonlinear incrementally virtual work caused by bi-moment. Finally, we associate the incremental virtual work equation of each sub-beam to obtaining the geometric nonlinear strain energy of I shape and channel shape by making up the centroid displacement of built up beam and sub-beam and the relational equation of equilibrium force.
LI, JUN-JIE, and 李俊頡. "Split Beam Method for Approximately Determining Modal Shape Function of Cantilever Beam under Multiple Loading." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/bb2x5b.
Full text國立臺灣大學
應用力學研究所
107
This study develops a new method, Split Beam Method(SBM). We utilize this method to solve the eigenvalue problem of Euler-Bernoulli Beam Equation more effectively. First of all, we split the Young’s Modulus corresponding to two or more subsystems with different loadings. Then we superimpose these sub-systems using linear superposition method. Following, we show how to apply SBM by two examples. In the first one, we utilize two different distribution loadings. In order to solve the difficulty caused by inhomogeneous eigenvalue problem, we made use of the inhomogeneous eigenvalue problem formula to have the solution. Then, the exact solution of deflection function would be obtained by utilizing inhomogeneous eigenvalue formula. Simultaneously, we control one of a distributed loading as constant and gradually increase the value of another distributed loading. We can find that the coefficient of the related subsystem function will increase when the second loading becomes larger and the second loading will become the dominate item in the total system. In the second one, we quote the paper about atomic force microscope, and use its model. Then, we modify a little to simulate SBM. We make Atomic Force(AFM) as a point force, and fix the oscillating force as constant. Then we find that the coefficient of the related subsystem function will increase when the second point force becomes larger and the point force will become the dominate item in the total system. From the results of these two examples, we ensure SBM is a correct and effective method. It simplify complex calculation and avoid multi- item behavior and useless calculation from Fourier superposition. In addition, SBM also provide one simple way to know which loading is the dominated one which is impossible to know from Fourier superposition.
Shao-PangPai and 白紹邦. "Detection of Beam Damage Using Digital Image Correlation Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/48885129284748283799.
Full text國立成功大學
土木工程學系碩博士班
100
This thesis used a digital camera and the testing machine (Instron 8801) for experiments applied the digital image correlation method to detect the beam damage. This experiment had three parts: (1) Using images of the specimens before and after the force, we calculated the displacement through a computer program written by the digital image correlation theory directly. (2) Cutting a slit at the central of specimens with the same experimental methods and programs to analyze the results and discuss their relationship, the results revealed that more displacement in the cracks will happen and have a discontinuous condition.(3) The establishment of an error equation using the Hermitian polynomial shape functions as an interpolation function to analyze of deformations before and after the cutting slit, the results indicated that the cracks will lead to the high error value, and thus estimate the location of cracks occur. The experimental material of the specimens was high-strength steel. Welding the parts to form a complete specimen was to simulate the real cutting the slit beam in the case of cracks under load. The article also describes how to use the testing machine (Instron 8801) and strain gauges for the extension of terms related experiments.
Lee, Jia-Cheng, and 李家誠. "Scatter correction in digital radiography using beam stopper method." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/06516143591213218948.
Full textLee, Yen-huei, and 李彥輝. "Applications of VFIFE method to the Timoshenko beam analysis." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/u5ht5n.
Full text國立中山大學
海洋環境及工程學系研究所
97
In this study, a vector form intrinsic finite element (VFIFE) is derived and applied to study both the static and dynamic responses of deep short beams under dynamic loadings. It is already known that the application of classical beam theory known as Euler’s beam theory to beams with large ratio of D/L (depth/span larger than 1/4), a short-deep beam, may not necessarily obtain satisfactory results for the stress analysis of the beam. One of the main presumptions from the classical Euler’s beam theory is that the plane of the cross-section remains plane and normal to the neutral axis of the beam after deformation. This presumption is no more true when the beam subject to loadings is a short-deep beam because the bending stress is no longer a dominant stress while the other secondary effects may have more severe influences on the mechanical behavior of the beam. This study by utilizing the vector form intrinsic finite element method (VFIFE) to derive a new element for the Timoshenko beam provides an alternative method for the analysis of a short-deep beam, particularly, subject to dynamic loadings. By taking the advantage of the VFIFE that is a time-saving scheme for the dynamic analysis, the element of Timoshenko-beam is derived along with the dynamic solution procedure. The motions in transverse direction and the rotation at each node of the beam are calculated and presented into figures. The results from numerical analysis are also verified with theoretical solution (exact analytical solution) and further compared to the results obtained from traditional finite element method.
WU, JIN-XIANG, and 吳錦祥. "Lateral bracing of I-beam by finite element method." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/80930499352762509876.
Full textHuoy, Hwang Ming, and 黃明慧. "Design of SRC Beam-Columns:Physical Behavior and Eccentricity Method." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/96732288328271557383.
Full text國立交通大學
土木工程系
87
The objectives of this research are to investigate the composite action between the steel and the RC parts of SRC structural members and to develop a new method for predicting the ultimate strength of concrete encased SRC beam-columns. The AIJ-SRC (1987) code calculates the beam flexural capacity by superposition method which neglects the composite action between the steel shape and the RC portion. But the ACI-318 code (1995) takes the SRC section as fully composite. In order to understand the actual behavior of SRC beams, some test results was collected to observe the strain distribution of SRC section. Then this research conducts an analytical study to determine the flexural capacity of a partially composite beam. Besides, this study extends the design concept used in ACI code for eccentrically loaded RC columns to the design of SRC beam-columns. Based on the concept of Strength Superposition, the component materials strength are determined by using the AISC-LRFD specification (1993) and the ACI code. This research also uses a computer program BIAX developed by University of California at Berkeley to model the nonlinear material behavior of the steel and the concrete. Finally, the predicted values are compared with previous test results and the proposed design codes.
Zeng, Yi-Ting, and 曾乙庭. "Damage Detection of Beam by the Influence Line Method." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/2d9e57.
Full text國立中央大學
土木工程研究所
97
Damage assessment of structure is an important task for the maintenance and management of bridge system. An influence line type inspection technique is developed in this thesis. The displacement influence line at a point in the span of a beam structure is measured first. Through the second derivative of this displacement influence line with respect to the spatial variable along the beam, both the locations and the severities of crack damage can be clearly identified. The feasibility and accuracy of this damage assessment technique are verified both theoretically and numerically of beams with various prestress states. The second Castigliano’s theorem is applied to calculate the displacement influence line of beams with various prestress conditions and damages. Due to the measurement noise, the capability of damage identification from experimental data is not as impressive as it shown in the numerical and theoretical investigations. However, this scanning type damage assessment technique by the influence line response provides a possible manner to improve the inspection efficiency if the effect from measurement noise can be reduced in the future.
Shen, Yan-Fu, and 沈彥甫. "Comparative Structural Analysis Including D-value Method and Cantilever Beam of Moment Distribution Method." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/53618920408436765432.
Full textLin, You-Hsing, and 林佑星. "Contact Analysis of Beam Structure by Using Finite Element Method." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/97248177629658457936.
Full text中原大學
機械工程研究所
95
This thesis presents a FEM method which use joint nodes, couple and contact to connect the models of a structure, also discusses limitations of these approaches, the conveniences of pre-process modeling, and the differences of analysis results on the basis of beam element and shell element. The FEM models, which are two parallel cantilerel beams, a cylinder vertical to a thin plate and a beam paralleled a plate, compared to the analysis results of using beam element and shell element according to solid element; beam elements are based on Timoshenko beam theory, shell elements are based on Mindlin-Reissner shell theory.
Chang, C. H., and 張家豪. "Phase calculation of a laser beam by an iterative method." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/29540194115889390228.
Full text明新科技大學
電子工程研究所
95
We developed an iterative method for calculating the phase profile of a laser beam if the intensity distribution is measured at two cross sections. TEM00 Gaussian beams were first analyzed by q-parameter transformation and some optimal choices for the locations of two intensity cross-sections were found to yield rapid convergence. We have also demonstrated the feasibility of calculating the beam spot-size of a Gaussian beam in a laser cavity by an iterative method. For a stable cavity, the procedure will converge as long as the initial parameters were suitably chosen. In some stable region, the procedure was found to converge fast. Our method can be easily generalized to deal with non-Gaussian beam to which the traditional ABCD-matrix method becomes inapplicable.
Sheu, Lih-Gen, and 許立根. "Analysis of Nd:Ti:LiNbO3 waveguide lasers based on beam propagation method." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/50028778075380076178.
Full text國立中央大學
光電(科學)研究所
86
In this dissertation, we analyze the physical behaviors of the Nd:Ti:LiNbO3waveguide lasers by applying various theoretical models proposed here. To developthe theoretical analysis of the Nd:Ti:LiNbO3 waveguide laser, a knowledge of thebranching ratios and emission cross sections is essential. We measured the Ndfluorescence spectra in Ti-diffused Nd:MgO:LiNbO3 waveguides, and then thefluorescence branching ratios and stimulated emission cross sections were calculated.The concept that the amplified spontaneous emission (ASE) is the origin of the laseris applied, and a theoretical analysis for the Nd:MgO:Ti:LiNbO3 waveguide lasersis proposed by calculating the evolutions of the pumping light and ASE. Because this analysis considers the spatial distributions of the Nd and Ticoncentrations, pumping, and ASE light in waveguide laser, it is appropriate for a case involving arbitrary Nd and Ti concentrations and waveguide profile. Thetheoretical data correlate well with the experimental results reported previously. A self-consistent model of Nd:Ti:LiNbO3 waveguide lasers based on the bi-directional beam propagation method is also proposed. The algorithm of the modelallows to describe the laser gain and pump absorption in term of the complex atomicsusceptibility for the case of the Nd ions. Considering the interference effect between the forward and backward light waves, the population inversion longitudinaland transversal spatial effects can be simulated. By employing the self-consistentmodel, the end-pumped Nd:Ti:LiNbO3 microchip waveguide lasers are analyzedtheoretically and then the design rules for the optimized microchip laser aredeveloped. Finally, the end-pumped and electro-optically tunable Nd:Ti:LiNbO3microchip lasers are also simulated and studied by using the theoretical method.
Ying-Chi, Lee, and 李英吉. "An Investigation of the Bi-Polar Coordinates Beam Propagation Method." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/87512927428159882354.
Full text國立臺灣大學
電機工程學研究所
88
The bi-polar coordinates beam propagation method (BPC-BPM) is investigated. It not only supports flexible division of waveguides but also simulates mesh shapes more accurately. For special waveguides such as taper, sector, etc., the conventional beam propagation method (BPM) can only approximate them by staircases. As computation is concerned with the conventional BPM, refractive index parameters have to be calculated step by step. Whereas with the BPC-BPM, the same refractive index parameters are used for all steps. In this paper, we also study the dispersion characteristics of BPC-BPM and found that the proposed BPC-BPM shows convergent characteristics during Pade iteration.
Shiao, Shen-Yuan, and 蕭勝元. "Improved local flexibility method for damage detcction of beam structure." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/27nheq.
Full text國立臺北科技大學
土木與防災研究所
101
The local flexibility method(LFM),which can determine local stiffness variations of beam structures using measured modal parameters,is founded on virtual forces that cause nonzero stresses within a local part of the structure and zero stresses in the other parts of a structure.In this study,the pseudo local flexibility method(PLFM) which break the “zero stresses rule” for better damage detection results is proposed. The proposed approach was verified by numerical studies and experimental study of a continuous beam and fix-end beam.The results show that much fewer modes are required for the PLFM to estimate the damage locations and extents with acceptable accuracy.In this study another modification of LFM was proposed.The “rotatory displacement” mode shapes were extracted from macro-strain vibration signals.These rotatory displacement mode shpaes were employed to detect damage of a beam structure utilizing the local flexibility method.The proposed approach was verified by numerical studies and experimental studies of a simply supported beam. Using the same number of modes,the numerical studies results was better comparing to the one using “lateral displacement” mode shapes.The experimental results show that using “rotatory displacement” mode shape has similar damage detection ability comparing to using “lateral displacement” mode shape,probably due to very large signal to noise ratio during experiment.
Ke, Yi-Han, and 柯逸函. "Balance Puzzle MIMO Beam Search Method for Millimeter Wave Channels." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5e4759.
Full text國立清華大學
通訊工程研究所
106
We focus on the angle of departure and angle of arrival searching problem for millimeter wave MIMO channel in the thesis. The path loss is high in the mmWave band. Hence, we need to use the massive MIMO and do the beamforming to combat these drawbacks. To implement the beamforming, we have to get the complete channel information. But the channel information is difficult to achieve in mmWave channel. However, the path which can arrive the receiver is few. Hence, there are literature proposed the new channel estimation method to find these paths, and it is called beam search. The most common method is exhaustive search, it trains over all possible beam directions for both the transmitter and the receiver, and find the best beam pair which have maximum signal magnitude. However, the method takes much time to do the beam search, and it also has high complexity. Hence, there are literature also proposed the adaptive algorithm with bisection method to shorten the searching time. In this thesis, we propose a new beam search method which is called balance puzzle beam search method by using the concept of logical puzzle. We design the different algorithm for the single-path and multi-path case and design the optimal threshold to make the spectral efficiency better. Finally, we consider the number of stages as a criterion for judging complexity, and do the complexity analysis. Simulation result show that the balance puzzle beam search method can reduce the complexity and have the comparable spectral efficiency compared to the bisection method, and the cost is to feedback one more bit in each stage.
Ye, Jia-Hao, and 葉家豪. "Development of Proximity Effect Correction Method for E-Beam Lithography." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/khrsbt.
Full text國立臺灣大學
生醫電子與資訊學研究所
106
Lithography is the key technology in integrated circuits manufacturing process, and the improvement of it is the main reason that Moore''s law can keep going. The rapid development of semiconductor industry and chips can become smaller and cheaper are closely related to the progress of lithography.For a long time, optical lithography is the mainstream in semiconductor industry, it is superior to other lithography method because of its mass production with high speed and low cost. However, with chips size become smaller and smaller optical lithography has reached its limit, it is necessary to investigate a new method for lithography, E-beam (Electron Beam Lithography) and EUV (Extreme Ultraviolet Lithography) are the main research direction lithography method in the future. As the development of semiconductor process, many important solid state device could be smaller and more efficient. For example: attena device and current trend of the 3-D device FIN-FET. All the device mentioned above need extremely high accurate and high developing quality to make sure that the stability of the attena array and avoid leakage current in the FIN-FET. The stability and efficiency depends on how to fabricate the pattern with high quality and extremely small size. In this thesis, we focus on how to improve the proximity effect in the e-beam lithography. We used the computer to simulate the developing process of the resist for improving proximity effect. The method we used is different from the traditional method including finding-all-possible method and cell-removal method, this two method take too much time because of the repeated trial-and-error process. we have proposed two hypothesis, one is there exists a critical path in developing environment, another one is we transform the developing path problem into a graph theory problem.Then we apply the particle swarm intelligence optimism which mimics the natural collective behavior of animals to reduce the computational cost. In this paper, we employ the depth of U-shape pattern to be a index of optimism level, and we have fabricated the U-shape structure with high quality and accuracy. It is helpful for improving the power and quality of signals U-shape split-ring resonator est.
Shen, Zi-Hui, and 沈姿慧. "Fast Beam Switching Method for Millimeter Wave Multiple Antenna Arrays." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/h3286x.
Full text國立中山大學
通訊工程研究所
107
In 5G millimeter wave technology research, we use beamforming to overcome the problem which high-frequency has a large energy attenuation. Actually, beamforming architecture includes analog, digital and hybrid beamforming. About analog beamforming, it only supports one direction at a time and so it will spend a lot of time tracking beam direction. Therefore, we propose an algorithm which call NOMP to achieve the faster beam tracking. By receiving three directions of beam, NOMP will estimation correct beamforming direction. Moreover, we also design a fast antennas switching method by NOMP because mobile phone which installed many mmWave antenna arrays will get high power consumption if it receivers signal by all arrays. This method will use one of arrays to receiver signal and the others only use power detection. We use this information to reconstruct channels of all arrays (we call simulation channels). From these simulation channels, we will know which one is the best array at current environment. After switching to the target array, performance of the receiver will keep stably. In addition, we develop a testing platform based on MIMO OFDM technology in order to verify the method above-mentioned and optimize baseband signal processing technology. In receiver, signal can be demodulated through synchronize, channel estimation, detector and decoder. We also propose an algorithm which joint detector and decoder and this algorithm will detect again by decoded information in order to reduce bit error rate and improve the performance.
Min-HuanWang and 王敏歡. "Development and Application of Low-cost Electron-beam Nanofabrication Method." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/69122417589224836613.
Full text國立成功大學
光電科學與工程學系
102
In this dissertation, low-cost electron-beam-based nanofabrication methods have been developed. These techniques can be used to fabricate large-scale nanostructures with relative low cost. The first method we developed is referred as Electron-beam stencil lithography (EBSL). The electron beam source is a commercial scanning electron microscope(SEM). The nano-pattern is pre-defined on a free-standing metal membrane fabricated using Nanospherical-lens lithography(NLL) also developed in our research group. The metal membrane is placed on top of the unexposed electron-beam resist thin film inside the SEM and the exposure is achieved after regular image scans. We can also use a unfocused electron beam to improve the fabrication throughput. In addition, we also discovered that a commercial table-top SEM can also be used to fabricate nano-hole arrays without using any stencil to block the electron beam. We referred this method as “Direct scanning-electron microscope lithography”(DSEML). Using this method, metal nano-hole arrays with periodicity as small as “263 nm” can be easily fabricated. In the final part of the thesis, we have fabricated InGaN/GaN nanorod LED using NLL and the two-step etching method. We can fabricate nanorod LEDs with diameters as small as “225” nm. The method can be also used to fabricated nano-LEDs with elliptical shape. The aspect ratio is around “2.67”. We will also look to fabricate nano-LED arrays using the proposed electron-beam-based methods.
Huang, Shi-Xian, and 黃世賢. "Simulation of multiple-beam interference by using ray tracing method." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/98270626810390555412.
Full text國立中正大學
光機電整合工程所
97
We study the patterning of multi-beam interference by using ASAP software. In the simulation results, we can find the one-dimensional periodic lines, two-dimension periodic points, random flower-like pattern, and three-dimension periodic structures with different number of beams interference. The maximum intensity of interference increases with number of beams. The higher intensity of interference will product more deep hole in the sample. The three dimension periodic structures come from the special beam interference that has different angle with Z axis among one of those beams. By the way, we apply the patterning results on the solar cell surface to study the optical properties of solar cell by using finite-difference time-domain (FDTD) method. The conversion efficiency of solar cell increases when the surface roughness with multi-beam interference technique. In the future, we can combine the multi-beam interference and ultra-fast laser ablation to fabricate the micro-components on the solar cell, lens, and fiber...etc.
Ho, Cheng-Ta, and 何政達. "Plasma beam alignment method applied in flexible liquid crystal display." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/12039080965396998731.
Full text國立成功大學
光電科學與工程研究所
94
To control the liquid crystals (LCs) orientation, the alignment is very important technology in the fabrication processes of liquid crystal display (LCD). Generally, the mechanically rubbed polyimide (PI) is the most use in LC cells as the material to align LC. But, there are many drawbacks of traditional rubbing for aligning LCs, including contamination of the sample, generation of static charge and scratches which would affect the electro-optical performance of the LCD. A lot of non-contact alignment techniques, such as ion-beam alignment, plasma treated alignment, and photoalignment, had been reported that they have great potential for LCs alignment. In this research, we have successfully fabricated light, thin, and impacting LCDs in flexible substrates, in which the non-contact plasma alignment technology was used. The flexible LCDs are very suitable to be used in portable electronic products, and think about the convenience and cheaper producing cost of the roll-to-roll fabrication. They must be key roles in the display of next generation. Reading a lot of important journals and conference papers, such as SID and IDW. We find many lead companies have invested the develop of flexible liquid crystal display. Therefore, the performance was compared between rubbing-aligned and plasma-aligned LCDs fabricated in plastic substrates in stead of traditional glass substrates. When the plasma with proper energy and incident direction bombarded the polyimide alignment layer, the optoelectronic characteristics of plasma aligned LCDs are almost the same as that of traditionally rubbed LCDs. In bending states, the LCDs aligned by non-contact plasma have ever better performance than that aligned by traditional rubbing.