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Dissertations / Theses on the topic 'Helical spring'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Laing, Kara Louise. "Non-linear deformation of a helical spring." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323220.

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2

Durickovic, Bojan. "Waves on Elastic Rods and Helical Spring Problems." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202750.

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This work examines problems in the statics and traveling wave propagation on uniform elastic rods with constant curvature and torsion, i.e. a straight rod and a helical rod. The first set of problems concerns planar traveling loop-like waves on intrinsically straight rods. It is shown that loops with compact support can exist on homogeneous rods with a nonlinear constitutive relation, where the strain-energy density contains a quartic term. Next, the effect of heterogeneity in the material properties on the shape of the loop is examined using a homogenization method. The second set of problems
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3

Porteiro, John L. "Spring Design Optimization With Fatigue." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1742.

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The purpose of this work is to look into the fundamental issues regarding spring design and develop a new, easy to use software program that would allow for optimal, flexible spring designs. Most commercial programs that address this function are basic and do not allow the designer much control over the variables hindering design. This is so because most programs start from the premise that the spring is a general purpose part of the system or that other design parameters can be altered to accommodate the chosen spring. In cases where this is not so, such as in hydraulic cartridge valves, wher
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4

Forrester, Merville Kenneth. "Stiffness Model of a Die Spring." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/32249.

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The objective of this research is to determine the three-dimensional stiffness matrix of a rectangular cross-section helical coil compression spring. The stiffnesses of the spring are derived using strain energy methods and Castiglianoâ s second theorem. A theoretical model is developed and presented in order to describe the various steps undertaken to calculate the springâ s stiffnesses. The resulting stiffnesses take into account the bending moments, the twisting moments, and the transverse shear forces. In addition, the springâ s geometric form which includes the effects of pitch, cu
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5

Stebner, Aaron P. "Development, Characterization, and Application of Ni19.5Ti50.5Pd25Pt5 High-Temperature Shape Memory Alloy Helical Actuators." Akron, OH : University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1194994008.

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Thesis (M.S.)--University of Akron, Dept. of Mechanical Engineering, 2007.<br>"December, 2007." Title from electronic thesis title page (viewed 02/22/2008) Advisor, D. Dane Quinn; Co-Advisor, Graham Kelly; Department Chair, Celal Batur; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
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6

Williams, Eric Andrew. "The Development of Actuators for the Whole Skin Locomotion Robot." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/46786.

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The Whole Skin Locomotion robot propels itself using a motion similar to the cytoplasmic streaming exhibited by an amoeba. In the robot there are embedded ring actuators which evert the material of the robot to produce forward motion. The robot benefits from a highly flexible exterior allowing it to squeeze into constricted passageways or collapsed structures. The development of actuators for such a motion is performed by a shape memory alloy composite actuator. Unlike a typical composite model which utilizes a homogenization of fiber and matrix properties our model is developed for line loads
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7

Nekoksa, Pavel. "Dosedy válcových šroubových tlačných pružin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231942.

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This diploma thesis deals with hot-formed helical compression springs. The first part of the thesis describes related problems and determines market potential. Following theoretical part describes the influence of contact line on behaviour of springs and compares it with normative regulations. Methods suitable for determination of helix shape are covered in the next part. The last part focuses on practical measurement, in which the change of helix shape during manufacture was observed. The main output of this diplomat thesis is suggestion of measures that should contribute to both optimization
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8

Hegana, Ashenafi B. "Low Temperature Waste Energy Harvesting by Shape Memory Alloy Actuator." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1461631046.

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9

Silva, Rafael de Oliveira [UNESP]. "Atenuação de vibrações em sistemas que utilizam molas de liga de memória de forma." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150444.

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Submitted by RAFAEL DE OLIVEIRA SILVA null (rafa_engemec@hotmail.com) on 2017-04-24T14:27:25Z No. of bitstreams: 1 dissertacao_final.pdf: 3521819 bytes, checksum: b08a60dcaa91691a2bf36a0cc59992e6 (MD5)<br>Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-04-26T13:27:52Z (GMT) No. of bitstreams: 1 silva_ro_me_ilha.pdf: 3521819 bytes, checksum: b08a60dcaa91691a2bf36a0cc59992e6 (MD5)<br>Made available in DSpace on 2017-04-26T13:27:52Z (GMT). No. of bitstreams: 1 silva_ro_me_ilha.pdf: 3521819 bytes, checksum: b08a60dcaa91691a2bf36a0cc59992e6 (MD5) Previous issu
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10

Silva, Rafael de Oliveira. "Atenuação de vibrações em sistemas que utilizam molas de liga de memória de forma /." Ilha Solteira, 2017. http://hdl.handle.net/11449/150444.

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Orientador: Gustavo Luiz Chagas Manhães de Abreu<br>Resumo: Diversos estudos relacionados à atenuação de vibrações utilizando materiais inteligentes vem sendo amplamente explorados no meio acadêmico. Neste âmbito, as Ligas de Memória de Forma (LMF) se destacam por apresentarem dissipação de energia vibratória devido ao seu comportamento histerético promovido pelo efeito pseudoelástico. No presente trabalho, dois sistemas com um e dois graus de liberdade, contendo mola helicoidal de LMF como elemento resiliente, são implementados numericamente para demonstrar a atenuação de vibrações ocasionada
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11

Grando, Denilson. "Modelagem de vagão ferroviário em sistema multicorpos e avaliação do comportamento dinâmico em via tangente com desnivelamento transversal periódico." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18149/tde-27092013-100120/.

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Este trabalho utiliza a técnica de modelagem de sistemas multicorpos para analisar o comportamento dinâmico de um vagão ferroviário de carga, trafegando sobre via tangente com desnivelamento transversal periódico. O estudo exibe a modelagem dos principais vínculos deste sistema, como o contato entre o prato e o pião, molas helicoidais e sistema de amortecimento de atrito seco da suspensão primária. A modelagem do contato entre o prato e o pião sugerida, é baseada em um modelo de elastic foundation, e utiliza a característica geométrica dos corpos em contato. O modelo dinâmico de atrito desenv
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12

Leech, Andrew R. "A study of the deformation of helical springs under eccentric loading." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA283448.

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13

Ward, A. P. B. "Analysis and use of resonance in the fatigue testing of helical springs." Thesis, Swansea University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639343.

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This work concerns the use of resonance, in a proposed test designed to rapidly determine the fatigue life of coil-springs. A method is described whereby any number of the lower natural frequencies and corresponsing mode-shapes, of a coil-spring, constrained by a variety of simple boundary-conditions, may be determined. A method which uses the predicted natural mode-shapes is described, whereby an index of stress, corresponding to the rate of fatigue damage to the coil-spring, resulting from: resonance, the application of opposing static longitudinal forces to the ends of the spring, and resid
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14

Smith, Brice Christopher 1976. "Geometric and elastic properties and mechanical phase separation phenomena in self-assembling mesoscopic helical springs." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29610.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2003.<br>Includes bibliographical references (p. 279-300).<br>Helical ribbons with pitch angles of either 11⁰ or 54⁰ self-assemble in a wide variety of quaternary surfactant-phospholipid/fatty acid-sterol-water systems. In all of the systems studied, the thermodynamically stable state for the sterol is plate like mono-hydrate crystals. However, the sterol is typically found to pass through a serious of metastable intermediates from filaments to helical ribbons to tubules before reaching the stable crystalline state. In t
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15

Ilzhöfer, Bernd [Verfasser], and A. [Akademischer Betreuer] Albers. "Untersuchung zur Optimierung schraubenförmiger Druckfedern = Investigation on the Optimization of Helical Springs / Bernd Ilzhöfer ; Betreuer: A. Albers." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1235072630/34.

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16

Chen, Xiaofei Verfasser], Markus [Akademischer Betreuer] [Albrecht, and Iris Marga [Akademischer Betreuer] Oppel. "Helicate-based cation triggered molecular springs / Xiaofei Chen ; Markus Albrecht, Iris Marga Oppel." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1195238177/34.

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17

Chen, Xiaofei [Verfasser], Markus [Akademischer Betreuer] Albrecht, and Iris Marga [Akademischer Betreuer] Oppel. "Helicate-based cation triggered molecular springs / Xiaofei Chen ; Markus Albrecht, Iris Marga Oppel." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1195238177/34.

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18

Velazquez-Guerrero, Ramiro. "Contribution to the Design and Implementation of Portable Tactile Displays for the Visually Impaired." Diss., Université Pierre et Marie Curie (Paris 6), 2006. http://hdl.handle.net/10919/71591.

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This thesis explores the design, implementation and performance of a new concept for a low-cost, high-resolution, lightweight, compact and highly-portable tactile display. This tactile device is intended to be used in a novel visuo-tactile sensory substitution/supplemen-tation electronic travel aid (ETA) for the blind/visually impaired.Based on the psychophysiology of touch and using Shape Memory Alloys (SMAs) as the actuation technology, a mechatronic device was designed and prototyped to stimulate the sense of touch by creating sensations of contact on the fingertips.The prototype consists o
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19

SANTIAGO, José Joelson de Melo. "Comportamento térmico e mecânico de molas helicoidais de liga com memória de forma Ni-Ti obtidas por fundição de precisão." Universidade Federal de Campina Grande, 2018. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1921.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-10-09T13:19:28Z No. of bitstreams: 1 JOSÉ JOELSON DE MELO SANTIAGO - DISSERTAÇÃO (PPGEM) 2018.pdf: 5893476 bytes, checksum: 9fec0f8b27ff639270bebb4444b2285c (MD5)<br>Made available in DSpace on 2018-10-09T13:19:28Z (GMT). No. of bitstreams: 1 JOSÉ JOELSON DE MELO SANTIAGO - DISSERTAÇÃO (PPGEM) 2018.pdf: 5893476 bytes, checksum: 9fec0f8b27ff639270bebb4444b2285c (MD5) Previous issue date: 2018-08-30<br>Em muitas situações de projeto em sistemas mecânicos deseja-se rigidez e ao mesmo tempo uma certa flexibilidade. Nesses casos, as m
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20

Miazaki, Marcio. "Controle de vibrações em rotores flexíveis utilizando molas helicoidais de liga com memória de forma." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152328.

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Submitted by Marcio Miazaki null (mmiazaki@gmail.com) on 2017-12-12T15:38:22Z No. of bitstreams: 1 Dissertacao.pdf: 2498214 bytes, checksum: bbe1b8f57d985978dca7748b50feb796 (MD5)<br>Submitted by Marcio Miazaki null (mmiazaki@gmail.com) on 2017-12-14T11:25:02Z No. of bitstreams: 1 Dissertacao.pdf: 2498214 bytes, checksum: bbe1b8f57d985978dca7748b50feb796 (MD5)<br>Submitted by Marcio Miazaki null (mmiazaki@gmail.com) on 2017-12-14T13:50:31Z No. of bitstreams: 1 Dissertacao.pdf: 2498214 bytes, checksum: bbe1b8f57d985978dca7748b50feb796 (MD5)<br>Approved for entry into archive by Cristina A
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21

XIANG, QIAN, and 項前. "The dynamic analysis of helical spring." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/63252855532183600019.

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22

Fang, Chung-Kai, and 方重凱. "Dynamic Analysis and Application Of Helical Spring Isolator." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/19771121914418577534.

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碩士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>92<br>Abstract The helical spring possesses 6 degrees of freedom, thus when it is used as an isolator, it can absorb the vibration energy in 6 degrees of freedom. This article aims at discussing the spring constants of the helical spring at 6 degrees of freedom, as well as analyzing its vibration isolation properties. Meanwhile, the spring isolator will be applied to the I-frame of the shaft of a high-speed yacht to isolate the vibration. The isolation effectiveness is analyzed and compared with the experimental values to verify the correctness of the analysis m
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23

黃政諺. "Rounded Corner Detection Algorithm for Helical Compression Spring Gauge." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/40818173945964731378.

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碩士<br>國立臺灣海洋大學<br>資訊工程學系<br>100<br>Feature detection is widely used in image processing, image recognition and machine vision. Points, lines and regions are usually understood as features. In addition, point features are such as object corners because of their variances are not to be impacted by geometry property, and they are simple to recognize for every man. Hence, more and more individual corner detections are proposed. However, rounded corners are seldom discussed in image recognition, and we find thathelicalcompressionspring is a great object of study. Furthermore, we will propose a roun
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24

Liu, Jie-Yu, and 劉潔妤. "Vibration analysis of a helical spring coated with damping layer." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/3x6erv.

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碩士<br>國立臺北科技大學<br>製造科技研究所<br>98<br>In this study, the damping material is coated of helical spring. The CAE software is utilized to analyze the dynamic characteristics of the structure. Two damping models are constructed, respectively are coating along the helical wire surface and coating around the wire into the hollow cylindrical. Use the FEM software to analyze the nature frequency and transient response. The vibration reduction effect due to coated damping layer with various coating thickness ratio (Tr), coils ratio (Nc) and positions are evaluated. The vibration reduction is indicated by
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25

CHANG, CHIH-CHUN, and 張智鈞. "Dynamic Finite Element Analysis of Pre-Twisted Cylindrical Helical Spring." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/98563y.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>99<br>Following the Wittrick’s twelve differential equations modified with including the pre-twisted angles effect, the present study uses the Rayleigh-Ritz method to develop the one-dimensional finite element equations of motion for the spatial curved beams which can be used in the analysis of pre-twisted helical springs. For the static problems of pre-twisted helical springs, the modified Wittrick’s twelve differential equations can be solved for the exact solutions by the transfer matrix method. The displacement functions in the exact solutions are used to derive
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26

Guo, Yue-Ci, and 郭岳其. "Analysis of the shear correction factor of rectangular helical spring." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/48782143353772387833.

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碩士<br>龍華科技大學<br>機械工程系碩士班<br>102<br>Spring in the current daily life and industry play an integral part, are often used in some of the spring force, so the spring can withstand shear and life is currently the most commonly discussed in section, and in the present The textbook formula for shear stress of the spring must add a correction factor, it can be more accurately calculated shear stress of the spring, the most common Wahl correction factor is deduced by a circular cross-section of the spring, is now recognized as the most accurate One formula, but rectangular cross-section of the spring a
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27

Huang, Gro-drue, and 黃國竹. "The Design of a Variable Pressure Damper Design for Helical Valve Spring." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/09140361384583805293.

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28

Juang, Yung-Jou, and 莊詠州. "DYNAMIC SIMULATION OF A HELICAL SPRING WITH A CUP DAMPER AND EXPERIMENTAL VERIFICATION." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/72727868282070431248.

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29

Yueh, Mei-Chen, and 樂美辰. "Mechanical Behavior of A SMA Helical Spring with Two-way Shape Memory Effect." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/6g2mge.

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碩士<br>國立臺北科技大學<br>機電整合研究所<br>98<br>In this paper, the processes of making SMA (Shape Memory Alloy) helical springs and training them to be of the two-way SME (Shape Memory Effect) were presented. The helical spring was activated by controlling the electric current applied via the Joule heating. The relationship between the applied current and the resulted temperature was measured. By fixing the SMA spring in certain lengths, the resulting actuation force of the spring upon different current levels were investigated. With the variation of the slope in these load-current and load-temperature
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30

Kao, Shih Hung, and 高世浤. "A Study on the Simulation and Heat-treatment parameters of Helical Compression Spring." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/39100196387972199651.

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31

Peng, Jiung-Shiang, and 彭俊翔. "Free vibration analysis of a non-uniform beam carrying multiple spring-mass systems with mass of each helical spring considered." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/13305671843679845533.

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碩士<br>國立成功大學<br>系統及船舶機電工程學系碩博士班<br>94<br>In engineering applications, many dynamic behaviors of structures can be modeled with a uniform or non-uniform beam carrying one or multiple spring-mass systems, so there exist many research reports in this aspect. However, in order to simplify the problem, most of the existing papers do not take the mass of helical spring of the spring-mass system into account. The objective of this paper is to study the vibration characteristics of the uniform or non-uniform beam carrying one or multiple spring-mass systems with the mass of each helical spring conside
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32

Ho, Jing Yuan, and 何進淵. "Dynamic Equations for the Helical Spring with a Cup Damper and Static Experimental Verifications." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/92326067061576698181.

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33

KUO, JIAN-XIN, and 郭建炘. "Study of applying piezoelectric material to helical rectangular spring as an energy harvest device." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8c9gm5.

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碩士<br>國立臺北科技大學<br>機械工程系機電整合碩士班<br>107<br>Now the high-tech industry is producing high-precision products, but the vibration of the machine during operation is difficult to avoid, but you can think about how to effectively use the energy that cannot be stored and reused, convert it into another form and use it again, make full use of it. These energy sources. This research topic explores in depth how to design an energy recovery device for the flexible deformation of flexible structures such as compression coil springs. The design method is to apply the piezoelectric material to the rectangular
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34

Wang, Shi-Jao, and 王錫昭. "Free vibration analyses of a beam carrying multiple two-dof spring-mass systems with inertia effect of the helical springs considered." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/64592916053056030602.

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碩士<br>國立高雄海洋科技大學<br>輪機工程研究所<br>97<br>This paper investigates the free vibration characteristics of a beam carrying multiple two-degree-of-freedom (two-dof) spring-mass systems (i.e., the loaded beam). Unlike the existing literature to neglect the inertia effect of the helical springs of each spring-mass system, this paper takes the last inertia effect into consideration. To this end, a technique to replace each two-dof spring-mass system by a set of rigidly attached equivalent masses is presented, so that the free vibration characteristics of a loaded beam can be predicted from those of the sa
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Lin, Rung-Ye, and 林榮業. "Study on Improving the AutomaticThree-Dimensional Measurement System for Helical Spring Back Characteristics of Plastic Pipes." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/97241953999848355580.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>102<br>Plastic pipes are popular and daily used goods. In order to fabricate a good product, new design concept and quality uniformity are important. Using machine vision technology to analyze the spiral plastic pipe quality such as spring-back property is a good methodology which can facilitate the industries and consumers to trust each other. It also can provide consumers a fair certification in purchasing goods. Therefore, to establish a systematic measurement system has become the research target. This study used the machine vision technology to improve th
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Jiang, Guang-Fu, and 簡光甫. "Application of Grey Relational Analysis and ANSYS Package to the Influential Factors on Natural Frequencies of Helical Spring." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/67501710940737311565.

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碩士<br>清雲科技大學<br>機械工程研究所<br>94<br>This paper is aimed at the utilization of grey relational analysis model to investigate the influential factors on the dynamic properties of a helical spring during manufacture. With all of the material properties remained unaltered throughout the simulation under the present research, the best parameter level in favor of spring fabrication is determined by means of combinations originated from three different values out of each of five influential geometric parameters, i.e., the helical angle, coil diameter, wire diameter, number of active coils, and the incli
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Yang, Tzu-Hung, and 楊子弘. "The Study of Using Hybrid Shape Memory Helical Spring in the Vibration Reduction of Semi－Active Suspension Platform." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/98650449250197470740.

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碩士<br>大葉大學<br>機械與自動化工程學系<br>97<br>In this study, the natural frequency and the associated damping capacity of a platform suspended by four helical springs were investigated at different controlled temperatures. The helical spring was fabricated with multiple layers of pyro condensation polymeric sleeve wrapped outside a superelastic NiTi core which has been heat-treated into helical configuration beforehand. The dynamic characteristics of the hybrid shape-memory helical spring was first investigated experimentally. It was found that the first natural frequency of the spring can be decreased
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38

(7847843), Rahul Deshmukh. "Influence of geometry and placement configuration on side forces in compression springs." Thesis, 2019.

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<div>A leading cause of premature failure and excessive wear and tear in mechanical components that rely on compression springs for their operation is the development of unwanted side forces when the spring is compressed.</div><div>These side forces are usually around 10% - 20% of the magnitude of the axial load and point in different directions in the plane perpendicular to the axis of the spring.</div><div>The magnitude and direction of the resultant of side forces varies very non-linearly and unpredictably even though the axial force behavior of the spring is very consistent and predictable
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Tsai, Tsung-Ming, and 蔡宗明. "Optimal Design of helical compression springs." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/75rvvy.

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碩士<br>中華大學<br>機械工程學系碩士在職專班<br>101<br>Springs are one kind of mechanic parts. They play the essential roles in the wide scope of devices including the daily appliances, transportation vehicles, and precision machines. Because the fields and purposes of spring applications are very different and also their influence factors of design and manufacturing are numerous. Conventionally, spring design is rather dependent on designer experience and subjective judgment. The design expending is concerned since that many costly trial efforts on time and effort are required. Thus, satisfactory quality of fi
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曾吉禎. "Steady State Analysis of Spinning and Compressing Helical Springs." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/09635960574099920053.

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碩士<br>國立中正大學<br>機械工程研究所<br>86<br>In general machining operations, the cutting tools were held by the draw - in mechanism in the spindle. Insufficient draw - in force would cause poor machining efficiency and quality. So, the draw - in force should be measured peridoically by a set of measurement system after the CNC machine operated for a long time. 　　A set of draw - in force measurement device was designed by Yung - Da Chen in 1996. The force produced by the helical spring in the measurement device balanced the draw - in force produced by Belleville springs. Then the draw - in force produced
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41

Lai, Jun-hao, and 賴俊豪. "Static and Dynamic Finite Element Analysis of Cylindrical Helical Springs." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/s69dpu.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>94<br>Following the Wittrick’s differential equations modified with including the temperature effect, the present study uses the Rayleigh-Ritz method to develop the one-dimensional finite element equations of motion for the cylindrical helical springs. For the static problems of cylindrical helical springs, the modified Wittrick’s differential equations can be solved for the exact solutions. The displacement functions in the exact solutions are used to derive the interpolation functions which are used in the computation of the mass, stiffness matrices and thermal loa
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42

Lin, Yi-shin, and 林億鑫. "Vibration Analysis of Fiber-Reinforced Composite Helical Springs with Rectangular Cross Sections." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/56562878736033179333.

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碩士<br>國立中興大學<br>機械工程學系所<br>103<br>In this thesis, a finite element model based on two-noded straight beam finite elements, with each node of nine degrees of freedom, is developed to study the dynamic characteristics of helical springs having rectangular cross sections. The helical springs could be made of isotropic materials or fiber-reinforced composite materials. The straight beam element being adopted has included the effects of the transverse shear deformation, torsion, cross-section warping, chordwise curvature, axial, transversal and lateral displacements. The equation of motion of the s
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Leu, Luo-wen, and 呂洛文. "Study on the Buckling of Helical Compression Springs under Compression and/or Torsion." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/13432844341839828585.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>98<br>Based on the equations of motion governing the natural vibration of helical springs subjected to static axial compression and twist, the present study develops the one-dimensional finite element equations of motion for the cylindrical helical springs which can be used in the analyses of buckling loads and natural frequencies. Using the transfer matrix method in the literature this study also solves the buckling loads and natural frequencies of cylindrical helical springs. Both results obtained by the transfer matrix method and the present finite element model a
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Chiu, Kuei-chun, and 邱奎鈞. "A Study on Effects of the Geometric Parameters of Helical Springs to the Stiffness and Stress." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/34srw7.

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碩士<br>國立臺北科技大學<br>機電整合研究所<br>101<br>Helical springs are an important element in the machinery and widely used. In this study, with CAE software package, one is to study the stiffness and the stress distribution on wire surface of the spring by changing the profile of its cross section, and study the effects of variable pitch and non-cylindrical springs. It is found that when the centroid and area of cross-section is fixed, the Oval-1-H95 is the optimal shape, it reduces the maximal stress by 2%~4% from the reference spring, when the stiffness is identical. On the other hand, when one comes to
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吳明勳. "= Investigation of the nonlinear behaviors of helical springs by considering the friction, coil close and end effect with static verification." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/52557032892327965750.

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46

Chen, Hung-Chin, and 陳宏晉. "Studies of Free Vibration of Fiber-Reinforced Composite Helical Springs with Circular Cross Sections Using Circularly Curved Beam Finite Elements." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/80223243921081227798.

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碩士<br>國立中興大學<br>機械工程學系所<br>103<br>In this thesis, a three-node, 6 degree of freedom per node, curved beam element including the effect of initial curvature and torsion of beam is proposed. In this curved beam element, the lateral and axial displacements, as well as the deformation due to both twisting and shearing of beam are also considered. The curved beam element is employed to analyze circular helical springs with circular cross section, where the springs are made of unidirectional fiber-reinforced composite layers having a preselected set of lamination angles. To study the initial tor
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47

Huang, Yi Shang, and 黃衣聖. "Comparisons of Curved and Straight Beam Finite Elements on Free Vibration Analysis of Rectangular Cross-Section Helical Springs made of Fiber-Reinforced Composite Materials." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/00385617958224759536.

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碩士<br>國立中興大學<br>機械工程學系所<br>105<br>In this thesis the free vibration of rectangular cross-section helical springs is studied using two types of beam element. The first type element is the 3 node, 18 degree-of-freedom, curved beam element and the second, the 3 node, 23 degree-of-freedom, straight beam finite element. The springs are assumed to be made of isotropic materials or fiber-reinforced composite materials. In both elements, the axial and lateral displacement, as well as the deformation due to both shearing and twisting of beam are considered, while in straight beam element, additional
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Nandhini, Devi N. "A Feasibility Map-Based Framework and Its Implementation for Selection in Engineering Design." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3770.

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A pragmatic method for selecting components and devices from a database or parameterized models is developed in this thesis. The quantitative framework presented here is sufficiently general to accommodate an entire device assembly, a component, or a sub-assembly. The details pertaining to a device or a component are classified into three sets of variables: (i) user-specifications, s (ii) device parameters, p , and (iii) device characteristics, c . Functional, practical, and performance-related attributes that a user can provide comprise user-specifications. Since, most often, a specification
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Nandhini, Devi N. "A Feasibility Map-Based Framework and Its Implementation for Selection in Engineering Design." Thesis, 2015. http://etd.iisc.ernet.in/2005/3770.

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Abstract:
A pragmatic method for selecting components and devices from a database or parameterized models is developed in this thesis. The quantitative framework presented here is sufficiently general to accommodate an entire device assembly, a component, or a sub-assembly. The details pertaining to a device or a component are classified into three sets of variables: (i) user-specifications, s (ii) device parameters, p , and (iii) device characteristics, c . Functional, practical, and performance-related attributes that a user can provide comprise user-specifications. Since, most often, a specification
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