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Dissertations / Theses on the topic 'Square tube'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Abdelkefi, Abir. "Frottement en hydroformage de tube : caractérisation du frottement par le test d'expansion en matrice carrée." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2006/document.

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L’objectif de cette thèse est d’étudier la possibilité de caractériser le coefficient de frottement par un modèle analytique. Tout d’abord, le modèle analytique (Orban-Hu,2007) a été programmé à l’aide du logiciel « Matlab » puis validé par simulation numérique à l’aide du logiciel « Ls-Dyna ». Ensuite, on a réalisé des essais expérimentaux afin de caractériser les propriétés mécaniques du cuivre d’une part et étudier la mise en forme de tubes par hydroformage de tubes. Par suite, le coefficient de frottement a été caractérisé aussi bien par le modèle analytique que par le test classique ‘pion

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2

Brown, William E. III. "Development Of Design Equations For A Square-tube Subbase Supporting A Shaft-mounted Speed Reducer." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/30983.

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Shaft mounted speed reducers are used in material handling applications, such as conveyor systems for transporting ore out of mine shafts. A subbase joins the reducer with an electric motor, and serves to limit the misalignment between the motor shaft and the reducer input shaft. The entire assembly is supported at two points: the axis of rotation of the reducer output shaft, which is fixed, and a clevis-pin joint under the motor, which prevents rotation of the assembly about the reducer output shaft axis. In an effort to reduce the production and material costs of subbases that support shaf

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3

Shetty, Sandeep Kumar Lankarani Hamid M. "Finite element modeling of energy absorption characteristic of hybrid structure - composite wrapped on a square metal tube." Diss., Click here for available full-text of this thesis, 2006. http://library.wichita.edu/digitallibrary/etd/2006/t067.pdf.

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Thesis (M.S.)--Wichita State University, Dept. of Mechanical Engineering.<br>"May 2006." Title from PDF title page (viewed on October 29, 2006). Thesis adviser: Hamid Lankarani. Includes bibliographic references (leaves 47-51).

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4

Fišar, Luboš. "Kriteria vzniku defektů při ohybu profilových trubek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229928.

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The thesis describes the knowledge from a round tube bending technology, as a description of conventional and unconventional devices. There are technological parameters in relation to the creation of defects, and equations for determining the bending moment. These knowledge has been generalized and applied to solution the changes of cross-section shape and thickness in the bending of square cross-section. The solution was implemented to specific component (20x2 mm steel tube with two successive radii R57,2 and R131,5). The results of experiments shows that the material is almost rigid-perfectl

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5

Dostál, Jan. "Tahokov." Master's thesis, Vysoké učení technické v Brně. Fakulta výtvarných umění, 2018. http://www.nusl.cz/ntk/nusl-377171.

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Controlled deformation. Under with conditions can the iron deformation process be affected? This work is focused on expanding steel profiles. Using various tests, I will confront the visual results with the technical possibilities of the material. Attempting to find a boundary that is still permissible in terms of maximum steel loading just before the material starts to fail. The resulting installation should show the enormous forces needed to distort the material, where the viewer will be directly confront with the process.

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6

Yang, Zhicheng. "Dynamic buckling of square tubes." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243260.

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7

Ronchietto, Fabio Federico Piraino. "Crushing characteristics of axially stacked square tubes." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5478.

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Includes abstract.<br>Includes bibliographical references (leaves 190-195).<br>The crushing and energy absorption characteristics of thin-walled specimens consisting of single, welded and two axially stacked plate-divided mild steel square tubes were investigated by the performance of numerous quasi-static and dynamic axial crushing tests and FEM (finite element modeling). The simulation was carried out using the finite element package ABAQUS/Explicit 6.7.1. Lengths of the specimens ranged from 300mm to 1700mm encompassing the three main modes of buckling of square tube specimens; namely progr

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8

Kalhor, Roozbeh. "Energy Absorption of Metal-FRP Hybrid Square Tubes." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/74960.

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Lower-cost manufacturing methods have increased the anticipation for economical mass production of vehicles manufactured from composite materials. One of the potential applications of composite materials in vehicles is in energy-absorbing components such as hollow shells and struts (these components may be in the form of circular cylindrical shells, square and rectangular tubes, conical shells, and frusta). However, constructions which result in brittle fracture of the composite tubes in the form of circumferential or longitudinal corner crack propagation may lead to unstable collapse failure

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9

Butz, Travis M. "Tests on pultruded square tubes under eccentric axial load." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/21800.

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10

Yuen, Steeve Chung Kim. "The effects of blast induced imperfections on the energy absorption characteristics of square tubes." Doctoral thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5446.

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Word processed copy.<br>Includes bibliographical references (p. 305-320).<br>This investigation examines how blast-induced imperfections at opposite sides of a square tube affect the thin-wall structure and reduce its crush load when compressed in the axial direction i.e. its energy absorption characteristics.

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11

Gelder, David Camenish. "Buckling and Crippling of Square Steel Thin-Walled Tubes Fabricated with Symmetrically-Overlapping U-Channels and Foam." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3346.

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Testing and analysis has been performed on square steel thin-walled tubes fabricated using symmetrically-overlapping U-channels and foam. This research analyzes flange-to-flange attachment, effect of foam in the columns, effect of adhesive stiffness, and influence of steel thickness, as related to the local buckling loads, global buckling loads, and crippling loads. Four 14-foot (4.27 m) foam-filled, thin-walled, galvanized steel columns were manufactured by Novatek, Inc. and tested in axial compression with pinned boundary conditions. For three of the four configurations, the two-piece 4-in.

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12

Bystrianská, Kateřina. "Ocelová konstrukce autosalonu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392250.

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The diploma thesis deals with the design and assessment of the steel construction of the car showroom in Jihlava. The ground dimensions of the structure are 40,0 x 52,0 m and the height at the highest point is 13,14 m. The supporting structure consists of a truss girder consisting of a set of arches, outer columns and an inner column with a strut. This is a freebase system, the distance of the bindings is 4.0 m. In the framework of the work is elaborated the comparison of two variants, more suitable includes the static calculation of the main supporting parts, including the joints and details.

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13

Tunková, Martina. "Městské lázně." Master's thesis, Vysoké učení technické v Brně. Fakulta architektury, 2010. http://www.nusl.cz/ntk/nusl-215713.

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14

Chou, Chin-Chang, and 周志昌. "A study of simulating performance for solar vacuum tube collector device square draft tube." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/24229002400363503349.

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碩士<br>遠東科技大學<br>機械工程研究所在職專班<br>100<br>As the world's energy consumption, natural resources application, and the energy generation way are more and more important. The renewable energy on research and development which just as the solar energy are utilized natural resources in everywhere, it is visual that environmental protection and pollution-free characteristics and the applications are more and more widely. In recent years, the solar energy is used most frequently in the general household vacuum tube solar water heater. The solar water heater was composed two major parts which are vacuu

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15

Kuo, Shu-Hao, and 郭書豪. "Numerical Study on Dynamic Crush of Thin-Wall Square Tube." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/86629479220940712437.

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碩士<br>中原大學<br>機械工程研究所<br>92<br>Thin-wall tubes due to its advantage in high strength-weight ratio are widely used in many structures. For structures under high-speed impact, the main issue is to obtain required strength to absorb impact energy. This thesis investigated the dynamic behaviors of thin-wall square tubes under high-speed impact. The load, energy absorption and deformation of thin-wall square tubes were analyzed numerically. First, the mean load method was applied to predict the mean load during the buckling process. Second, the software LS-DYNA was employed to study the buckling

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16

Tseng, Tsai-Ming, and 曾才鳴. "Improved Circulating Square-tube Inclined Fluidized Beds for Dehumidification Systems." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/dxxb9x.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>107<br>The purpose of this study is to design an inclined circulating fluidized bed that maintains a proper humid indoor environment and be energy-efficient. With gravity, the design of particle channels and the characteristics of the fluidized bed, the system can adsorb water vapor continuously and steadily. This study first experimentally investigates the performance of the fluidized bed, both circular and square tube, under different operating air conditions. The results indicates that the adsorption capacity is increased with the raising relatvie humidity of the

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17

Wun-Bin, Liu, and 劉文彬. "3-D numerical simulations of square tube jet in cross flow." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/3k7s58.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>94<br>This study aims to investigate a jet coming from a square tube in a still environment or in a cross wind using an in-house numerical model. The cross sectional flow structure of a square jet in a still environment is similar to a steady radioactive shape. When the jet interacts with a cross wind, the flow structures can be categorized into four modes according to various momentum ratio of jet to cross flow $R$, i.e. downwash, cross wind dominated, transition, and jet dominated modes. This study reveals evolution of wakes behind the jet and the square tube at Re

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18

Chang, Yi-Cheng, and 張益誠. "Three-dimensional Contents Generator and The Design of Square-Tube-Mirror." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/40432753923783359937.

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碩士<br>國立清華大學<br>光電工程研究所<br>98<br>To greet the 3D (three dimensional) era, the technologies of 3D content generation and 3D display should be available. However, there are not many powerful technologies to convert 2D films to 3D now. Moreover, different kinds of displays have their own formats to present 3D films. It's a challenge to create universal 3D contents for all display platforms. We study a Square-Tube-Mirror (STM) device to capture multiple 2D images simultaneously. 3D contents can then be generated by building the depth map thought a reconstruction process. Stereoscopic image is also

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19

陳健源. "The Segmentation of Square Tube Mirrors Image Views by Digital Image Processing." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/80531410766461931402.

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碩士<br>國立清華大學<br>光電工程研究所<br>98<br>Most of three-dimensional (3D) content generation programs cannot generate a stereoscopic image directly. 3D content is realized by capturing the two-dimensional images of the object at different angles firstly then reconstructing the stereoscopic image by the software. The performance of a stereoscopic image will suffer if the software converting 2D to 3D image is not efficient and accurate. Square tube mirror image system is a special three-dimensional content generation designed to generate a special two-dimensional image composed of nine views (as if take

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20

張元榕. "On the Rising of a Tiny Bubble in a Small Vertical Square Tube." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/92368861857383240398.

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21

ZHANG, GUANG-YAO, and 張光耀. "Experimental Behavior of Corner Plate Shear Connectors in Square Concrete Filled Steel Tube." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/twfq9q.

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22

Shetty, Sandeep Kumar. "Finite element modeling of energy absorption characteristic of hybrid structure - composite wrapped on a square metal tube." Thesis, 2006. http://hdl.handle.net/10057/265.

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The study of axial crush behavior of metal and composite tube has become a basis for the design of crashworthy structure in automotive and aircraft applications. Unlike metals, polymer composite material displays little or no plastic deformation characteristics. Research has showed that the hybrid tube usually made of inner aluminum tube over-wrapped with Eglass fiber reinforced epoxy have significantly higher energy absorption than either aluminum tube or composite tube. It is therefore important to have a predictive design tool that could simulate the response of the hybrid structure under i

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23

Huang, Chien-Yuan, and 黃建元. "Visualization of the Marangoni Convection During Boiling of Binary Mixtures in a Square Capillary Tube by Micro-Schlieren Technique." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/30916086202303163383.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>101<br>In this study, we employ a micro-schlieren system to observe Marangoni convection induced by concentration gradient during boiling of binary mixtures in square capillary tubes of various sizes. The effects of channel size, concentration of working fluids and mixture characteristic on boiling heat transfer are investigated experimentally. From the relation between refractive index gradient and grayscale ratio, we are able to quantify the concentration gradient near the vapor-liquid interface. The inner widths of square capillary tubes we use are 200 micrometer

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24

Liang, Jhih-Jhang, and 梁智彰. "The Effects of spray inclination angle on the heat transfer performance for a square-pitch shell-and-tube interior spray evaporator." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/61323292876911824489.

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碩士<br>南台科技大學<br>機械工程系<br>97<br>This investigation focuses on different heat transfer performances resulting from various spray angles in a square-pitch shell-tube evaporator. A subsequent comparison of the heat transfer performances between the experimental results of pool-boiling and spray-boiling is also made and investigated. Most of the related previous studies show a negative influence on the heat transfer performance as erratic fluxes are created and a central non-affected area forms as a result of the spraying force applied to the surface of heat. This investigation is conducted by chan

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25

Ray, Purnendu. "Lateral collapse of empty and filled square tubes." Thesis, 1995. http://localhost:8080/xmlui/handle/12345678/2922.

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26

Sinha, Santosh Kumar. "Lateral compression of square tubes and their cross layered systems." Thesis, 1988. http://localhost:8080/xmlui/handle/12345678/2887.

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27

Li, Cheng-Yu, and 李振宇. "Three-Stage Least Squares Estimators for bath-tub Model." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/31811073403723248834.

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28

Lai, Chi-Yang, and 賴麒仰. "Numerical simulation of flow fields in a tube with branches by a least-squares finite element method." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/83819872553682492872.

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碩士<br>中原大學<br>土木工程研究所<br>93<br>A numerical calculation procedure based on the least-squares finite element method (LSFEM) is employed to simulate flow field in abdominal aorta with two branches. In this paper, the two branches are considered either on the same side or on the opposite side of the artery. The baseline flow fields and the possible flow interaction between the two branches is major concerned in this study. When the two branches are on the same side we found that the flow field and shear stress distribution are not quite similar to that in a single-branched tube while the two b

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29

Lu, Po-Shen, and 盧柏伸. "Application of least-squares finite element method on the study of flow and heat transfer in a 3-D heat exchangers with in-lined and staggered tubes." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/68118460257399321980.

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碩士<br>中原大學<br>土木工程研究所<br>94<br>ABSTRACT A numerical calculation procedure based on the least-squares finite element method (LSFEM) is employed to study the fluid flow and heat transfer in a 3-D heat exchangers with in-lined and staggered multiple–row (4 rows) tubes. In this study, the fin pitch of the heat exchanger is 8 fins per inch and the fluid flow is assumed steady, incompressible, and laminar with Reynolds number ranging from 200 to 600. In this paper the pressure drop, pressure coefficient, heat transfer coefficient, local Nusselt number and average Nusselt number for different geometr

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