Dissertations / Theses on the topic 'Linear springs'
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Schjølberg, Martin. "Planned Test of the Prototype 2B Linear Machine with Gas-Springs for Energy Harvesting from Waves." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14766.
Full textKilic, Mehmet. "Design And Development Of A Mechanically Adjustable Linear Torsion Spring Using Cams." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610960/index.pdf.
Full textantagonistically working two quadratic springs method. But the proposed solution requires two non-linear springs with quadratic spring characteristics and they are not readily available. Several solutions have been noted in the literature for the acquisition of such non-linear springs. At this thesis work, the solution is realized with a string wrapping around cam mechanism. Two different prototypes were designed and constructed and the second one was physically tested to validate the linear spring behavior. The results displayed good linear spring characteristics with different levels of adjustable spring stiffness. Beside the antagonistically working two quadratic springs method, three novel methods to get mechanically adjustable linear springs are introduced at this thesis. They are based on using hanging weights, an exponential characteristic spring and a linear translation spring respectively. The real prototypes were not manufactured but sample designs using string wrapping around cam mechanisms are made.
Oliveira, Fernando Emerenciano Nunes de. "Controles semiativos e observador de estados não linear aplicados em suspensão veicular com amortecedor magneto-reológico." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2904.
Full textProven, the passive vehicle suspension system is a reliable and cost-effective solution solution for both chassis and wheel vibration levels reduction and chassis acceleration levels reduction. Although this system is widely used in vehicles, it has the disadvantage that its parameters can not be modified according to the variations generated by the track. This results in the use of the active suspension system, which allows the variation of the parameters of the suspension in real time, however, the use of this type of suspension requires a high level of energy for the correct operation of its actuators, resulting in the unfeasibility of some applications. To solve the disadvantages found for the passive and active suspension system, the semiactive suspension system arises, which combines the advantages of the active system, but with a lower energy consumption, consequently generating a reliable and economical solution control option to the problems of maneuverability and vehicular comfort. The present work intends to perform two evaluations, the first being the evaluation and comparison of a passive suspension system with the performance of four semi-active controllers (on/off, skyhook, groundhook and hybrid) and the second is to test the same controllers, but considering the dynamics of a magneticrheological damper through the LuGre model. These controllers will be applied to a nonlinear model of a quarter-car with two degrees of freedom, with its variables being estimated through a nonlinear state observer. The analysis for the comparison of the systems will be performed through numerical simulations using MatLab® software. The simulations of the disturbances generated by the track will be performed through a step function and a pulse function in order to evaluate the performance of each controller. After the implementation of the control algorithms, it was possible to verify that the system of semi-active suspension against the proposed excitations presented a superior performance in relation to comfort. However, not as significant as comfort, the controllable system alo compared to the passive system, presented improvements in the steerability requirement.
Ganzarolli, Francisco. "Influência das frequências de ride no conforto e dirigibilidade veiculares na faixa linear de uso do veículo." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18149/tde-05092012-073800/.
Full textThe range of assumptions for ride comfort is considered very wide in the automotive world and they can assume lots of possible interpretations. The central idea in this work is define and manage some metrics that, during the concept and development phases of a vehicular program, be possible to follow a better direction for the attributes development and so reach the program targets. As the example in this work, a B platform typical vehicle is used and it is under development in a carmaker, its suspension springs and axle roll stiffness were setup with technical information similar to the ones presented in this work. The initial approach is empiric as occurred with the first independent suspension system studies in this continent and in the sequence, the work is complemented with standards for vibrational issues (ISO2361, ISO5008, BS6055), after this, finally how the vibrational energy is defined and perceived by human beings. The automotive suspensions of current days are very complex and there are lots of specific components to do a specific work, so the analysis are limited to primary ride and sub limit handling (up to 0,5 g). As conclusion, its possible setup a car that is comfortable and stable in the same time, since the elastic components for the vertical dynamics and steady state conditions are correctly set, so its correct balance is reached and no other components attributes are compromised to compensate any deficiency.
Švrček, Jakub. "Třísítný vibrační třídič." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416620.
Full textLaing, 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.
Full textHill, Bradford K. Greene Michael E. "A linear CMOS tunable active resistor." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Electrical_and_Computer_Engineering/Thesis/Hill_Bradford_35.pdf.
Full textRubalcaba, Roberto Ramon Johnson Peter D. "Fractional domination, fractional packings, and fractional isomorphisms of graphs." Auburn, Ala., 2005. http://repo.lib.auburn.edu/EtdRoot/2005/SPRING/Mathematics/Dissertation/RUBALCABA_ROBERT_56.pdf.
Full textHall, Anthony R. "The Pseudo-Rigid-Body Model for Fast, Accurate, Non-Linear Elasticity." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3869.
Full textEvans, Megan Elizabeth. "Determining a Relationship Between Posterior Chain Flexibility and Linear Sprint Speed." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/47430.
Full textPh. D.
Guinot, François. "Déploiement régulé de structures spatiales : vers un modèle unidimensionnel de mètre ruban composite." Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10019.
Full textThe research department of Thales Alenia Space is studying new concepts of space telescopes whose secondary mirror is deployed thanks to the unreeling of six tape-springs. A breadboard using metallic tape-springs has been built during preliminary studies and has exhibited a deployment that is too energetic and induce too important shocks.In this thesis a new kind of tape-spring with a controlled uncoiling speed is introduced. Secondly a rod model with highly deformable thin-walled cross-sections describing the dynamic behaviour of tape-springs is derived.In order to over come the deployment speed of a tape spring, a viscoelastic layer is stuck on its sides. Thanks to its properties varying with the temperature, the viscoelastic layer is used to maintain the tape-spring in a coiled configuration at low temperature whereas a local heating leads to a controlled uncoiling. These phenomenons have been underlined experimentally and numerically.Because of the high complexity of classical shell models and the lack of details of simplified models, smart modelling methods need to be developed to describe the highly non linear behaviour of a tape-spring. A planar rod model with highly deformable thin-walled cross-sections that accounts for large displacements and large rotations in dynamics is proposed. Starting from a classical shellmodel, the main additional assumption consists in introducing an elastica kinematics to describe thelarge changes of the cross-section shape with very few parameters. The expressions of the strain andkinetic energies are derived by performing an analytical integration over the section. The Hamilton principle is directly introduced in a suitable finite element software to solve the problem. Several examples (folding, coiling and deployment of a tape spring) are studied through the FEM software COMSOL to demonstrate the ability of the 4-parameter model to account for several phenomena: creation of a single fold and associated snap-through behaviour, splitting of a fold into two, motion of a fold along the tape during a dynamic deployment, scenarios of coiling and uncoiling of a bistable tape-spring
Stahlin, Simon. "Non-Linear FE-Analysis of a Composite Action Girder with Coiled Spring Pins as Shear Connectors." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74008.
Full textNär kraven på att broar ska klara av ökade laster, kan förstärkningsarbeten utföras. I de fall där äldre stål-betongbroar saknar samverkanseffekt, är det ett alternativ att inför samverkan för att uppnå en högre böj-hållfastighet. Det införs genom att man installerar skjuvförbindare i efterhand. Det finns många olika alternativ av skjuvförbindare som kan användas, därav ett antal som går att installera underifrån bron för att minimera påverkan på trafiken. Spiralbultar (Coiled Spring Pins) är av typen presspassnings-förbindare och sätts på plats underifrån bron genom att det först borras ett hål uppåt genom övre stålflänsen och sedan upp i betongplattan. Därefter pressas spiralbulten upp i det borrade hålet med hjälp av en hydraulisk hammare. Med hjälp av data ifrån push-out-tester samt icke-linjära material modeller för stål och betong, skapades en icke-linjär analys i det finita element metods programmet Abaqus. Analysen är uppbyggd med dimensioner och lastfall som ska efterlikna ett planerat full-skaligt balktest som kommer utföras under 2019. För att verifiera att materialet och modellen beter sig realistiskt, utförs en analys på en balk utan samverkan, samt en full-samverkans balk med oändligt styva förbindare. Dessa jämförs sedan med handberäkningar enligt Eurokod. När materialmodellerna var verifierade sågs det att materialen stål och betong arbetar för sig själva i analysen utan samverkan och tillsammans i analysen med full-samverkan. Data för spiralbultarna lades sedan in istället för oändligt styva förbindare och nya analyser utförs för att se påverkan av spiralbultarnas egenskaper. Resultaten visade att en betydande ökning av punklasten i mitten av balken kan ske innan brott uppstår vid installation i efterhand av denna typen skjuvförbindare. Redan vid ett lågt antal förbindare och ett lågt skjuv-förhållande ses en betydande ökning av böj-hållfastigheten i balken. Genom att använda delvis-samverkan med ett lägre antal spiralbultar kan man på ett ekonomiskt sätt uppnå en betydligt högre böj-hållfasthet.
Miller, James. "Changes in Sprint Kinematics Between Phase Potentiation and Linear PRogressive Models of Resistance Training." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etd/3309.
Full textNigrowsky, Pierre. "Variable structure control of robot manipulators (the example of the SPRINTA)." Thesis, Brunel University, 2000. http://bura.brunel.ac.uk/handle/2438/4827.
Full textHedrich, Philipp, Maik Johe, and Peter F. Pelz. "Design and Realization of an Adjustable Fluid Powered Piston for an Active Air Spring." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199924.
Full textSpringer, Phillip [Verfasser], and Stephan W. [Akademischer Betreuer] Koch. "Linear and Nonlinear Optical Properties of Germanium and Dilute Nitride Containing Semiconductors / Phillip Springer. Betreuer: Stephan W. Koch." Marburg : Philipps-Universität Marburg, 2016. http://d-nb.info/1103658204/34.
Full textAschenbrenner, Anna-Katharina [Verfasser], and Otmar [Akademischer Betreuer] Spring. "Die linearen Drüsenhaare der Sonnenblume : Morphologie, Verbreitung, Metabolitprofil und Sesquiterpenbiosynthese / Anna-Katharina Aschenbrenner. Betreuer: Otmar Spring." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2014. http://d-nb.info/1063014735/34.
Full textMcCabe, Carla. "Effects of 50m and 400m race paces on three-dimensional kinematics and linear kinetics of sprint and distance front crawl swimmers." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/3300.
Full text稲垣, 瑞穂, Mizuho INAGAKI, 幸男 石田, Yukio ISHIDA, 晃正 林, and Akimasa HAYASHI. "クリアランス内で衝突を伴うロータの非線形強制振動と自励振動 (非線形ばね・減衰モデルによる分数調波振動の解析)." 日本機械学会, 2005. http://hdl.handle.net/2237/9040.
Full textŠtafa, Michal. "Trojrozměrné pružinové sítě a jejich aplikace." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-355601.
Full textHegana, 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.
Full textMackura, Mark. "Nano-confinement Effects of Crystalline Walls on the Glass Transition of a Model Polymer." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1366815752.
Full textKenfack, Pierre. "La conception, l'étude théorique et expérimentale, d'une génératrice électrique linéaire à structure polyentrefer à lamesguidées ou frottantes." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS006/document.
Full textThe linear electric generator is intended to be coupled to a thermal (thermoacoustic) machine for the design of a generator set with external heat source (heat recovery of a thermal machine). This thesis deals with the adaptation to generator operation, more precisely to steady-state operation with a unit power factor. Special attention is paid to tribological aspects related to guiding the fixed and moving parts of the electromagnetic structure.A literature review is presented before moving on to a theoretical discussion on the fundamental concepts relating to electromagnetic computation. Equivalent steady-state circuit parameters and generator efficiency are calculated from the dimensional and structural characteristics of the generator. The design and steady-state performance of the generator are validated by the finite element method. The numerical computation is integrated into a multi-object optimization process by a set of the best compromises facilitating the choice of generator sizing and a high efficiency solution is retained as the final concept. Validation by the finite element method employed in ANSYS is done. Validity is verified by a good match between the experimental and numerical results.The main problem encountered in the design of linear electric generators multi air-gap structure guided or sliding plates is in the control of the mechanical clearance necessary to allow the permanent displacement of moving parts. This problem is very difficult to control because the magnetic air-gap must be as small as possible to avoid penalising the tangential magnetic pressure. The moving parts are of low thickness in the multi air-gap structure, therefore less rigid. The moving plates, therefore, tend to rub against the fixed parts. The triboguiding helps solve this problem. The tribology is the study of friction and lubrication applied to wear problems. Its objective is to reduce wear and friction in order to improve the performance of linear electric generator multi air-gap structure guided or sliding plates.The device has been designed and implemented to compensate or even cancel the friction forces that appear between the two fixed stators and the moving plate in translation. This device is a system to compensate for reaction force based on pressure screws acting on springs. The principle is to return the exact force of attraction between the mover and the stators thanks to an adjustable spacing force (the action of a set of pressure screws on springs) between the stators
Fléchon, Elsa. "Définition d'un modèle unifié pour la simulation physique adaptative avec changements topologiques." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10284/document.
Full textThe work made during my PhD, respond to the problematic of physical simulation of the behavior of deformable objects subject to topological changes in interactive time. My work resulted in the definition of a new unified model coupling a complete topological model and a physical model for physical simulation of deformable objects decomposed in surface as volume elements, while performing during this simulation topological changes such as cutting or subdivision local of a mesh element. This operation allowed us to propose an adaptive method where mesh elements are refined during the simulation according to a geometric criterion. For the topological model of our unified model, we made the choice of combinatorial maps and more particularly linear cellular complexes. Their main advantage of the latter is the simplicity of its equations, its intuitive implementation, its interactivity and its ease to handle topological changes. Finally, the definition of a unified model allowed us to propose a model avoiding duplication of information and facilitate the update after topological changes
Silva, Fabiano Leite da. "Metrópole corporativa e fragmentada: a urbanização da Península do Ribeirão Cocaia - Grajaú em São Paulo." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/8/8136/tde-02122016-131109/.
Full textThis paper discuss the occupation of a watershed area that is inserted in the South Zone of São Paulo, Ribeirão Cocaia Peninsula. To discuss this process sought to work with the relation between different scales, relating more general process of expansion of the city of São Paulo, and the establishment of corporate metropolis and how it reflected in this important area of the city, which had been considered as an important strategic area of conservation of water resources and that turned into a mostly housing low-income workers. Despite the recent changes with the improvement of parts of some neighborhoods in Ribeirão Cocaia peninsula, there are still areas of great precariousness in this space of the city. In this way we tried to make a spatial area three districts that make up the Peninsula: The Grajaú, during the installation of Cohab Bororé in the 70s; the Cocaia Residential Park, based in illegal settlements in the 1980s, and the Corner of Heaven, where the occupancy gains strength in the 1990s. This paper discusses the question of the use and occupation of watershed areas, reflecting on how this process took place, and what has been done so far, trying to draw attention to this issue.
Singh, Subrat, and Shreedhara Sreehari Veditherakal. "CAE modelling of cast aluminium in automotive structures." Thesis, Linköpings universitet, Mekanik och hållfasthetslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162190.
Full textDureau, Maxime. "Characterization and simulation of the mechanical forces that control the process of Dorsal Closure during Drosophila melanogaster embryogenesis." Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL0999/document.
Full textThe work presented here aims at characterizing and simulating the mechanical forces involved in the process of Dorsal Closure in the organism Drosophila melanogaster, an embryonic process. In particular, Dorsal Closure participates in the acquisition of the final form of the embryo. Therefore, the work presented here aims at fathoming our knowledge on tissues mechanics, as well as their role in the acquisition of shape. The tissues involved in Dorsal Closure are the epidermis and the amnioserosa. At this stage of development, the epidermis surrounds almost all the embryo. Nevertheless, the amnioserosa still covers a large area of the dorsal side called dorsal hole. Hence, Dorsal Closure aims at shutting this hole and joining the lateral sides of the epidermis, in a process similar to wound healing. In order to fuse the two sides of the epidermis on the dorsal line, the epidermis must be drawn dorsalward. This movement is driven by the amnioserosa on the one hand, and by the dorsalmost row of the epidermis (called Leading Edge cells) on the other hand. The latter first form a transcellular Actin Cable around the dorsal hole. The cable, contracting, will reduce the area of the dorsal hole, covered by the amnioserosa. Second, the Leading Edge cells emit protrusions that will attach to the opposite Leading Edge and drag it toward themselves, untill the two sides of the epidermis fuse. These protrusions have a limited range, hence the dragging and fusion only take place at the ends of the dorsal hole (called canthi), where the distance between the two Leading Edges is small enough. The Amnioserosa also drags the epidermis toward the dorsal line. Its cells produce a contractile network. Interstingly, Amnioserosa cells see the area of their top side (apical side) vary in a periodic way. Although these variations have been widely studied, their role in Dorsal Closure remains unknown. This PhD aims at improving our knowledge of the mechanical concepts involved in these oscillations, and to build a physical model representing these movements. The work presented here also studies the movements of the Leading Edge cells, in order to understand the effect of the Actin Cableon the dynamics of Dorsal Closure. In order to study the cells movements and the role of the tissues involved in Dorsal Closure, an algorithm was developped, allowing to detect the cells edges, their position, as well as those of their vertices (multiple junction between three or four cells) and to track them over time. A user interface was also developped, in order to facilitate the adjustment of the parameters allowing the detection, as well as the correction of possible errors. Various dynamical models were then built following the lagrangian approach. The systems of equations deriving from the Euler-Lagrange equations were numerically solved, and their predictions compared to the biological data extracted thanks to the algorithm presented earlier, following the least square approach. The model validation was performed thanks to the autocorrelation function test. Finally, the Leading Edge dynamics was studied characterising the cellular movements at the interface between the epidermis and the amnioserosa. Wild type embryos dynamics were compared to those of mutated embryos showing specific defects in the Actin Cable formation. The results presented in this manuscript allow a better understanding of the processes involved in in Amnioserosa cells oscicllations. They also give clues on their biological characteristics. Finally, they assess the role of the actin cable in this process similar to wound healing
喜弘, 山梶, and Yoshihiro Yamakaji. "車両駆動系トーショナルダンパにおける非線形振動に関する研究." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13158482/?lang=0, 2021. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13158482/?lang=0.
Full text博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University
Cgu, Cheng-Chung, and 朱政仲. "Toward the Constant-Torque Linkage-Type Mechanisms Using Linear Springs." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/64082568982689815327.
Full text國立臺灣科技大學
機械工程系
105
This study explores the design possibility of a spring-type rigid-link mechanism that produces a constant torque. The mechanism we aim to devise should have rigid links and a spring only without the use of flexible rods and cams. In this thesis, we firstly reviewed the development of the torsional mechanisms. We then put forward two possible mechanism concepts to output constant-torque, and use these two concepts to design three nearly constant-torque mechanisms. Then we analyzed the output torque of each mechanism, and then use Matlab and Adams software to verify the design results. Finally, we chose the most feasible design, performing its geometrical optimization. The design result shows that the average fluctuation of the output torque is only 5.67% during 60 degrees to 110 degrees of the crank motion.
CHEN, XIAOMIN, and 陳曉敏. "Development and Verification of the Normal and Tangential Equivalent Linear Contact Springs of Egg Shape Particles." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/799hnj.
Full text國立中央大學
土木工程學系
102
In this thesis, equivalent linear contact spring constants are developed for the contact between deformable particles such as spherical particles and egg-shaped particles, based on the Hertz contact theory and Mindlin contact theory of tangential stiffness. The physical significance of this study is that we can adopt an equivalent linear spring stiffness to model the non-linear contact behavior of Hertz’s contact; It’s shown that the theory normal equivalent linear contact spring stiffness is related to the initial relative velocity of the two contact particles, elastic constant and geometry of contact area; tangential stiffness is related to the normal mutual approach distance of the two particles and elastic constant. The newly developed egg-shaped particles are designed by the revolution of an ellipse, formed by four connected arcs, about the major axis passing through its centroid. Surface of egg-shaped particles can be divided into two spherical surfaces and a curved surface. Mainly contact can be divided into spherical surface contact and curved surface contact. The surface of egg-shaped particles belongs to rotating surface, so that we can quickly determine the principal radius of curvatures in the two contacted curves. Numerical simulations for granular assemblies used equivalent linear contact spring stiffness, simulate the behavior of direct impact and oblique impact and compare the result with theoretical solution.
Ni, Yen-Yih. "A linear programming approach to the analysis, design and failure prediction of layered springs with frictional contacts." 1996. http://catalog.hathitrust.org/api/volumes/oclc/36488108.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 139-145).
(7847843), Rahul Deshmukh. "Influence of geometry and placement configuration on side forces in compression springs." Thesis, 2019.
Find full textHo, Chi-Hwa, and 何其驊. "Development and Research of Flat-Circular Spring Linear Guiding System." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/51741485486285968515.
Full text國立臺灣大學
機械工程學系
85
The aim of the research is to develop a kind of spring linear guiding system named flat-circular spring linear guiding system, which bases on curved foil. The flat-circular spring linear guiding system, as other ordinary spring linear guiding system, has spectaculars as followed: 1.no coulomb friction force 2.no abrasion between parts of composition 3.simple structure 4.low requirement to operating environment 5.smooth guiding movement. Besides, it has larger stroke than ordinary spring linear guiding system and adjustable restoring force. The mechanical properties of the flat-circular guiding system and guiding errors under different operating circumstances are estimated by using finite element analysis. According these results, the criteria of design to different application restriction can be concluded.
Hsu, Chin-Long, and 許金隆. "The Development and Performance Research of Electrostatic Flat- Circular Spring Linear Actuator." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/52732441204006536125.
Full text國立臺灣大學
機械工程學系
85
The objection of this research is to develop an electrostatic driving linear actuator, and to discuss the property of electrostatic driving force. In the theoretical analysis, the changes of shape and maximum stress of the flat- circular spring that is loaded by the side force are analyzed by the finite element method. According to the shape, the electrostatic driving force of spring is calculated. By the process of the design method, the entire actuator systems are developed, analyzed, and chosen to be proceed the deeper research. The solutions of the subsystem are developed by the conceptual design, and elected by the experiment or evaluation. After the prototype is designed, manufactured and tested, the performance of the actuator is realized, and the factors are revealed that affect the motion of actuator. From the result of experiment and the analysis of theory, the movement modal of actuator is constructed. Three major subsystems are flat- circular spring with guiding function, driven move part, and the component that generates electrostatic force.
Xu, Jin-Long, and 許金隆. "The Development and Performance Research of Electrostatic Flat- Circular Spring Linear Actuator." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/65327217592123156707.
Full textMin-YenTsai and 蔡旻諺. "Verification of Equivalent linear spring on the Experiment of the Scoured Piled Bridge." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/f42268.
Full text國立成功大學
土木工程學系
106
In Taiwan, there are many bridges that were destroyed by the nature disasters every year. Although the civil engineers did the best on designing the bridges, the nature disasters would decrease the seismic capacity of the bridges. The survey of the collapsed bridge pointed out that the scoured depths increased by the hydraulic and the seismic capacity decreased. In this study mainly discusses the structural behavior of the composite structure, ie, the structural behavior of the foundation exposed to erosion and exposed to seismic loads. In the study, the equivalent linear soil springs proposed by previous researchers ,the American Petroleum Institute(API) and Japanese Road Association(JRA) soil spring were used respectively. This study used different soil springs to analyze the vibration behavior of shaking table experiments after bare pile erosion, and compare with the existing single and group pile foundation experiments. The discussion and comparison of the applicability of the soil springs on exposed structure shows that the response of the experiment can be more effectively simulated by using the equivalent linear spring model. The most important is that the model using equivalent linear spring under near-fault earthquakes completely simulate the behavior of the structure after the shock.
Getting, Roger Llewellyn. "Response of linear prairie remnants to seven years of annual spring burning evaluated in terms of guilds." 2003. http://catalog.hathitrust.org/api/volumes/oclc/51766676.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 95-102).
HU, CHUN-MING, and 胡俊明. "Study of Nonlinearity Effect from the Fixed Boundary of Leaf Spring on the Linear Piezoelectric Vibratory Conveyor." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3g2845.
Full text國立臺北科技大學
機械工程系機電整合碩士班
107
Vibratory conveyor is an indispensable equipment in the process of automated manufacturing assembly. The resonance of the machine is likely to loosen the structure or reduce the structural stability. This study mainly discusses the fixed boundary of a linear vibratory conveyor. The nonlinear phenomenon generated by the stage motion is obtained by adjusting the tightening torque of the screw on fixed end to obtain the relationship between the stiffness of the fixed boundary and the natural frequency of the structure. If the leaf spring is installed on the base with the same tightening torque, it is found that the greater the rigidity of the leaf spring itself, the greater the nonlinear phenomenon emerges. In other words, if the bonding strength of the fixed boundary is too small, it will cause more obvious nonlinear phenomenon in the system dynamics. From this study, the fixed boundary of the leaf spring can have a certain influence on the natural frequency of the vibratory conveyor. The greater the rigidity of the leaf spring, the greater the tightening strength of the leaf spring at the fixed end is required to reduce the nonlinearity of the machine. In addition, the distribution of clamping force on the fixed boundary will also have impact on the natural frequency and stability of the mechanism. More uniform distribution of the force on both sides of the fixed end can not only increase the natural frequency, but also reduce the nonlinear phenomenon and make the mechanism run more stably.
Nascimento, Vítor Emanuel Morais. "Desenvolvimento de conceito - bateria MAD – (MAgnetic spring Disk)." Master's thesis, 2018. http://hdl.handle.net/10316/86046.
Full textA integração de sistemas de armazenamento de energia (ESS) na gestão da produção e planeamento de grandes centrais elétricas é um dos objetivos mais cobiçados da atualidade. As tecnologias existentes não são ainda suficientemente capazes de responder ao problema e, não só o planeta mas também a economia começam a sentir as consequências. A ciência e a engenharia têm feito progressos no melhoramento das tecnologias atuais no sentido de alargar as suas aplicabilidades.Na presente dissertação pretende-se explorar um conceito inovador de ESS baseado na interação magnética entre ímanes permanentes, a bateria MAD. O texto começará por dar a conhecer alguns dos principais sistemas de armazenamento de energia da atualidade, bem como os vários tipos de áreas onde estes se aplicam e também as características que permitem diferenciar as demais tecnologias. Neste contexto, abordam-se as principais vantagens de ESS incorporados na rede de gestão e produção de energia elétrica bem como as consequências da utilização deficiente dos mesmos. Seguir-se-á um estudo numérico para averiguar qual a melhor configuração e geometria para posterior construção do modelo MAD, utilizando o software EMS da EMWorks. O desenho mais promissor encontrado segue o principio de uma mola linear como base para o armazenamento de energia potencial, no entanto, este efeito mola surge de forças atrativas e repulsivas entre campos magnéticos. Cumprindo as premissas resultantes dos estudos numéricos, o texto termina com a construção do modelo proposto, com o objetivo de servir de prova de conceito a esta nova tecnologia. Algumas das conclusões mais importantes deste trabalho são a possibilidade de conceber um ESS com auto-descarga nula e a demonstração da viabilidade de um conceito alternativo de armazenar energia de forma compacta, sem impactos ambientais negativos e com a vestalidade de poder ser aplicado em qualquer parte do mundo, independentemente de quaisquer fatores geológicos ou geográficos.
Integrating energy storage systems (ESS), in large management of energy production is probably one of the holy grails of the present days. The existing solutions are not yet enough to face the problem and, not only the environment but also the economy are starting to feel the consequences. Progress is being made to improve the current technologies, to make them viable for such applications. This paper explores a new concept of ESS, the MAD Battery, based on force interactions between permanent magnets. At first, the reader will be introduced with some of the most important ESS technologies in the market, as well as the tools needed to compare them. At this point, it is going to be discussed some of the most important advantages of integrating ESS on the electric grid, as well as the consequences of the lack of investment in this area. Later on, will be considered a numeric approach making use of EMS software by EMWorks to find the best suitable design before any model construction or experiments. The most promising design found follows the principle of a linear spring as the basis for the storage of potential energy, however, this spring effect arises from attractive and repulsive forces between magnetic fields.Following the principles that resulted in the numeric studies, this paper ends with what concerns the construction of a model that proves this new MAD concept.Some of the most important conclusions are the possibility of conceiving an ESS technology without self-discharge, no environmental impacts and with the versatility to be implemented in any place, regardless of any geologic or geographical factors.
Universidade de Coimbra - Financiamento para aquisição de materiais para contrução do modelo proposto.
Deng, Chih-ying, and 鄧志瑛. "A Study on the Relationship Among Customers Satisfaction and Repurchase Intention for Hop-Spring Consumers-Hierarchical Linear Model (HLM) Approach." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/31076807534243399142.
Full text東吳大學
國際貿易學系
94
This study aims to analyze the relationship among service quality, customer satisfaction and repurchase intention for hop-spring leisure activities. By the time living lifestyle improves, consumers are demanding more kinds of leisure activities than before. In order to have more customers, improving service quality is one of the most important management aspects for hot-spring hotels. This study was used a perfect analysis method, called Hierarchical Linear Modeling to evaluate the relationship between customer and service quality. Using 28 hot-spring hotels from the North, Central, South and East of the Taiwan hot-spring area as research area, 598 questionnaires were distributed to find out the precise relationship among service quality, customers satisfaction and repurchase intention, in order to provide better suggestions for future studies and hot springs practitioners. The results show that high service quality can lead to better customers’ satisfaction. Even though consumers put their trust on service quality, but customer satisfaction is still the intermediate factor between service quality and customer repurchase intention. Key words: hierarchical linear modeling, hot spring, service quality, customers’ satisfaction, repurchase intention.
Yu, Li-Feng, and 游麗鳳. "A Hierarchical Linear Model of Organizational Performance, Service Quality and Customer Satisfaction-Evidence from Hot Spring Industry in Hsinchu Area." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/47018455589405758592.
Full text中華大學
企業管理學系碩士班
99
With the increase of personal income and leisure time, more and more people are engaged in outdoor activities surrounding by the natural environment for stress ease or mental and physical relaxation. The most important one is the hot spring outdoor consumption activities. Its physical and mental nursing functions and tourism values are tremendous for tourism development. Thus the most important issues for the hot spring industry are how to improve service quality, customer satisfaction for contributing to the organizational performance. This study aims to explore whether the service quality and customer satisfaction have a positive impact on the organizational performance of the services and whether the organizational performance of the service has interference effects on the service quality and customer satisfaction. In this study, questionnaires have been distributed to the hot spring hotels’ owners and the consumers. A total of 500 consumer questionnaires were issued and 460 questionnaires are valid samples while 45 for hot spring industry owners and 40 are valid. SPSS and HLM are employed as the statistical analysis tools. The statistical data analysis approaches include analysis of demographic variables, reliability and validity analysis, correlation analysis, HLM, and interference analysis. The empirical results show that: 1.The hot spring industry's service quality has a positive impact on customer satisfaction. 2.The organizational performance does not have a positive impact on service quality in the hot spring industry. 3.The organizational performance does not have the interference effect on service quality and customer satisfaction . The managerial implications in the study can provide the hot spring industry in Hsinchu area as references for management and assessment of service performance.
Riedel, Lukáš. "Rozšíření platformy pro analýzu datových toků o podporu knihoven na vkládání závislostí." Master's thesis, 2021. http://www.nusl.cz/ntk/nusl-448316.
Full text(6620237), Sokheang Thea. "Identification of Stiffness Reductions Using Partial Natural Frequency Data." Thesis, 2019.
Find full text喜弘, 山梶, and Yoshihiro Yamakaji. "車両駆動系トーショナルダンパにおける非線形振動に関する研究." Thesis, 2003. http://id.nii.ac.jp/1707/00028174/.
Full text博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University