Dissertations / Theses on the topic 'Hydraulic'
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Nezbeda, Filip. "Hydraulický pohon kontejnerových nůžek CNS 730/190 MTC." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230384.
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This work includes design of the drive hydraulic shears. The objective is to replace diesel-engine for electric motor. There is a description of the machine and its technological shearing process, types of hydraulic drives and their applications. The work includes the design, description and calculation of hydraulic power unit with an electric motor in two versions. Then there is evaluation of alternatives and select one to which they are processed further structural elements.
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Skolds, Dan Michael. "Alluvial stream bed adjustments downstream of hydraulic structures." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/19435.
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Tranová, Kateřina. "Hydraulická analýza vodovodní sítě městské části Brno - Ivanovice." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265396.
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This diploma´s thesis aims to model the hydraulic model of the Brno – Ivanovice water supply system. The software MIKE URBAN for model hydraulic model of water supply system was used. It was performed a simulation of the various states of loading. The water supply system was assessment of pressure ratios. The outcome of this work is calibrated hydraulic model of water supply system. The appendix consists also of drawings, which represented pressure ratios, which are situated on water supply system. On the fourth drawing is described transparent situation of Brno-Ivanovice water supply system.
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Škarvada, Radoslav. "Hydraulický přidržovač/vyhazovač." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228139.
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Diploma thesis solves project of the hydraulic blankholder/ejector for the mechanical press. On the basis of defined parameters are carried out the analysis of crank mechanism, necessary calculations, analyse of all suggested alternatives, project of hydraulic system and specification of hydraulic components. Tutorials took place in company ŽĎAS, a.s. and project is performed on the basis of the suggestions, advices and recommendations of Hydraulic systems department of this company.
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Bártek, Petr. "Nová koncepce hydraulického pohonu CPB." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230510.
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The main objective of this master's thesis is to design the new conception of hydraulic drive of the baling press CPB 100 with application of modern tendencies in the field of hydraulic engineering. This thesis contains design and calculations of new hydraulic drive, hydraulic circuit diagram and the list of hydraulic elements that are used. Moreover this thesis includes the design of an electrical control and the design of hydraulic block and manifold.
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Davis, Gary Stanley. "A laboratory investigation of a rock riprap control structure in an open channel." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/21006.
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Jaipal, Prithviraj. "Hydraulic hybrids." Thesis, KTH, Fordonsdynamik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-224159.
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Conventional IC Engine powertrain layouts in vehicles tend to consume considerable amounts of fuel and generate emissions that are harmful to the environment. Newer technologies have enabled the development of sustainable vehicle layout designs that favor a reduction in the exhaust emissions and energy consumption without compromising the vehicle’s performance. Hybrid vehicles and electric vehicles are the torch bearers for this development. Although electric vehicles feature high performance at lower emissions, they are generally limited by their range and high battery costs. Development of countries to equip for this electrification is another important factor here as with the development of more electric vehicles comes the problems associated with charging, like charging stations, charge scheduling (from power grid because of the high toll), etc. Hybrid electric vehicles are energy efficient and reduce the emissions considerably but their costs are substantially higher. Along with the higher efficiency generated by the electric machines, the possibility of regenerating braking energy reduces the energy consumption and increases the energy efficiency of the conventional layouts. Hydraulic hybrids in the recent years have gained recognition for their advantages and are known for being the cheaper alternative for hybridizing heavy vehicles. The ability of storing regenerative braking energy in this fluid form allows for higher cyclic efficiency when compared to that of the electrical means of storing energy. This thesis focuses on the design and modeling of the hydraulic hybrids using MATLAB/SIMULINK® to construct models depicting the use of the vehicles under the selected drive cycles. Regenerative braking has been one of prime focus for improving the range and minimising the energy consumption of the vehicle along with high operational efficiencies of the operating components. The thesis takes into account two cases, one with the case of a medium duty vehicle with a conventional IC Engine layout and the other with the case of electric forklifts. The two cases are compared with their hydraulic hybrid layouts along the lines of energy consumption, operational efficiencies and range. Through the design of these simulations, a comparative analysis of the hydraulic hybrid to the electric hybrid is provided for the case of the medium duty vehicle and the benefits of having an electric hydraulic hybrid layout designed for the electric forklift applications are studied.
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Lukeštík, Přemysl. "Hydraulická soustava hydraulické ruky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231210.
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This thesis deals with the design of the hydraulic system of hydraulic crane. It focuses on the description of the individual elements of the existing hydraulic system, analysis of forces, calculate diameters of linear hydraulic motors and their pressures and flow rates.
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Kluka, Ladislav. "Konstrukce hydraulické ohýbačky ocelových profilů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229274.
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This master’s thesis deals with design of a hydraulics bending machine. Bending machine will be used primarily for bending reinforcement bars in the shape of stapes. It consists of bending, sliding and chute system, which are located in the machine frame. Drive of each system is provided by a rotary and two linear hydraulic motors. Then there is described a hydraulic system and selection of its most important parts. Work is supplemented by visual documentation in the form of images of individual systems were processed in a CAD system Inventor 2010
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Vavrla, Petr. "Hydraulická drapáková lopata." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228812.
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In those work am intent on construction hydraulic grab, his two dipper, but largely supporting frame, that is of mostly effortful. Further am suggested and drew up hydraulic perimeter for operating dipper and rotation about perpendicular axes
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Markonda, Raviteja, and Pratikchandra J. Vasava. "IMPROVED DESIGN FOR HYDRAULIC VALVE AND HYDRAULIC VALVE TESTING RIGIMPROVED DESIGN FOR HYDRAULIC VALVEAND HYDRAULIC VALVE TESTING RIG : DESIGN AND PRODUCT DEVELOPMENT." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-29534.
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The hydraulic testing rig is a machine that is used to test the hydraulic valves.The present testing rigs are used according to only some particular specification, but in ourproject we have developed a process and implemented the idea for building a UniversalHydraulic Testing Rig which can be able to test any kind of valves with simple adjustments.The hydraulic valves are mainly designed to carry out the flow of the hydraulic fluid with thedesired pressures. But it is observed that there are many pressure losses in the flow whichleads to the unreached flow pressures as expected. In a pre-project to this work a patentedhydraulic valve designed to improve the flow pressure of the hydraulic fluid. The main targetof the design of the valve is to decrease pressure losses and give maximum output from theother end of the valve. The Hydraulic Testing Rig is designed with the help of design softwareand flow simulation process helps to know about the pressure flow from inlet to outlet ofthe valve. After the testing of the design, the valve is tested on the new universal hydraulictest rig developed in this project. With the future use of the hydraulic valve test rig, thesimilarities and variations are observed from both the simulations done and test results canbe compared to optimize the valve design further. With the combination of hydraulic test rigand redesign hydraulic valve we will provide and experimental test rig possibility to bringthe better and maximum design that could be attained reducing the energy losses in hydraulicvalve designs.
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Votava, Michal. "Hydraulické posunovače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254345.
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This diploma thesis deals with the design of the hydraulic puller. Furthermore, the diploma thesis presents the analysis of possible design solutions. It includes processing the selected design of the hydraulic puller with parameters: maximum pushing force 50 kN, speed of work movement 0,05 m.s-1. The analysis by using finite element method (FEM) is made. The next part of thesis includes the design of hydraulic circuit of puller. In the last part of thesis there is the design for replacement of hydraulic puller by mechanical systems.
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Pospíšil, Lukáš. "Návrh pracovní části hydraulického obvodu pro hydraulický lis." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254331.
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The master’s thesis is focused on the proposal of working part of the hydraulic circuit for the hydraulic press with a press force 400 kN. The thesis contains justifiable structural design of the linear hydraulic motor, which includes material choices, necessary calculations and simulations of material strength characteristics and the choice of the individual components. The thesis also includes a proposal of “heel valve” including the choice of individual components and basic function calculation of the hydraulic circuit of the hydraulic press.
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Dickman, Brian Daniel. "Large scale roughness in open channel flow." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/22953.
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Pfeiffer, Ferris M. "Dynamics and stability issues of poppet type pressure relief valves /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1422952.
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Kvasnica, Tomáš. "Hydraulické posunovače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228403.
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This Diploma thesis occupies with design of hydraulic puller. In work are mentioned possible types of construction. Choice construction of puller is disposed with parameters: maximum pushing force 50 kN, speed of piston rod 0,05 m/s. This work also contains FEM analysis by computer programme I-DEAS. The work also occupies with design of fluid drive.
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Helle, Ola Høydal. "Electric hydraulic interaction." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14045.
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The hydraulic models representing hydro turbines and conduit system found instandard model libraries of power system analysis tools are often simplied mod-els. Subsequently, important information about the dynamics of the hydraulicsystem may not be properly represented by such models, putatively resultingin insucient representation of the interaction between the electric system andhydraulic system.In this master thesis three dierent hydraulic models for hydro power plantsequipped with Francis turbines for use in power system simulation software hasbeen studied: 1) a simplied model often found in power system simulation tools;2) a model including a surge tank and elastic water column and 3) a model thatincludes a surge tank, elastic water column and turbine parameters accountingfor the characteristics of the hydraulic turbine.The hydraulic models were implemented in Simpow, a power system simulationtool. A frequency scan in the range from 10􀀀3-5 Hz was performed. The re-sults were compared with a frequency scan from LVtrans, a program specicallydesigned for accurate simulation of the dynamics of the hydraulic side in hydropower plants. The comparison showed that the simplied model failed to prop-erly represent the dynamics of the conduit system. The the model with surgetank and elastic water column was able to represent the dynamics of the con-duit system with satisfactory accuracy. Best representation was achieved for themodel including turbine parameters.The three hydraulic models were implemented in three dierent power systemcongurations: a single machine innite bus system; a system consisting of twointerconnected areas; and a system that has sustained power oscillations. Theresulting active power delivered from the generator were the hydraulic modelswas implemented, the speed of the turbine, the pressure at turbine and the owthrough the turbine were investigated.The simulation results revealed that the active power variation from the gener-iiators is in the same range for all three models, except for the simulation withsustained power oscillations. The speed variations of the turbine as a result ofincidents in the electrical network are in the same range for all three models.The model including turbine parameters is the only model able to representthe pressure variation as a result of a variation of speed of the turbine. Forpower oscillations with frequencies equal to the half period frequency of the waterhammer eect,1.38Hz, both the model with surge tank and elastic water columnand the turbine parameter model show very little response. For frequencies equalto the water hammer eect, 0.69Hz the variation in ow is also small for the twomodels. In general, the model with turbine parameters are better damped thanthe two other models.Further work should include development of an automated routine for determin-ing parameters to use in the model with turbine parameters as well as investiga-tions of how the model behaves in dierent network congurations.
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Prime, David. "The hydraulic lung." Thesis, Cranfield University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420674.
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Дубінський, Володимир Володимирович, Владимир Владимирович Дубинский, Volodymyr Volodymyrovych Dubinskyi, V. P. Chuiko, A. A. Plyhyn, Любов Павлівна Ярмак, Любовь Павловна Ярмак, et al. "Vibrating hydraulic drive." Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/17188.
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Inderelst, Martin, David Prust, and Michael Siegmund. "Electro-hydraulic SWOT-analysis on electro-hydraulic drives in construction machinery." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71235.
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This paper discusses the potential of centralized or decentralized electro-hydraulic (EH)-drives in comparison to conventional hydraulic systems. The systems are presented in diagrams covering the major electric and hydraulic components for an exemplary application, but also include specific technical data like the sizing of the components according to power, pressure, rotational speeds etc. In a second step, all systems are compared and evaluated based on criteria like design effort, energy saving potential, controllability, and servicing and maintenance of the machine. The resulting effects on fuel consumption are summarized as well. Finally, an evaluation of the potential of EH-drives in construction machinery and a derivation of the demands for future customization of electro-hydraulic linear drives is given on the basis of a SWOT-analysis from the point of view of a construction machinery OEM.
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Edwards, Andrew J. "Properties of hydraulic and non-hydraulic limes for use in construction." Thesis, Edinburgh Napier University, 2005. http://researchrepository.napier.ac.uk/Output/6884.
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The term "lime" comes from the word limestone. Limestone rocks were converted to lime powder by burning (calcining). The process of converting limestone to lime was an old process and it has been well documented, archaeologically. It has been established that the production of lime is the oldest industrial process can"ied out by humankind, dating back thousands of years. In fact, 3650 years ago Moses instructed the people of Israel, after they crossed the Jordan River, to set up large stones and whitewash them with lime and write the laws of God in lime. Lime was the most commonly used cementatious binder until about a century ago, when its use started to decline. It was replaced by Portland cement, a material essentially developed for structural purposes in the era of the industrial revolution. Portland cement has certain advantages over lime. The material develops strength and hardens faster for work to be carried out at a greater pace with better quality control and agreed standards. It has now become the dominant cementitious binder, part of it due to aggressive marketing of the material by the manufacturers. The use of Portland cement in the restoration and conservation of old buildings and structures in the UK over the past few years has resulted in a series of problems and cost millions of Pounds to eradicate. The decline in the use of lime in many countries has not only caused a diminution of its production, but has also contributed to a gradual disappearance of the traditional skills required both to produce a high quality product and to use it in construction. Therefore it is necessary to reintroduce and revive the old tradition of using lime by providing more information about its production and use. At present there are no comprehensive standards or code of practices, British or European to aid engineers and contractors in the use of hydraulic and non hydraulic limes in construction. BS EN 459 (2001) gives guidance on the chemical and physical properties of limes but it does not provide vital information about lime-based mortars e.g. mix proportions, mixing process, bond with masonry units, curing methods and all other necessary aspects to assess in the use of the material in construction. At present it is very easy for engineers, contractors and consultants to misuse lime mortars in new construction or in restoration and conservation of old buildings. Part of the decline in production of lime and reluctance of use in construction is due to the lack of understanding of the material properties and its performance in structures. Therefore it is necessary to examine and revive the old tradition in using lime mortars in construction and look at the new technologies used presently in the production process in order to provide the necessary background and information to aid the use of the material The present study provides a literature review, test results, discussions, conclusions and background information to set up standards in the production and use of hydraulic and non-hydraulic limes and their mortars in the construction of new buildings and the restoration and conservation of old buildings. Hydraulic and non-hydraulic limes have an excellent track record in buildings through history but their use in the UK was missed for some thirty years or more. Part of the reason for undertaking this research programme was to examine the properties of pre-packaged hydraulic limes available in the market at present. The properties of limes vary considerably dependent on the raw materials, composition and manufacturing process. The results of this study showed that there was a great variation in the properties and performance of limes and their mortars. The results also showed that the properties of lime mortar improved by adding different percentages of POliland cement. The research examined the effect of sand grading on the lime mortars compreSSIve, splitting and brick/mortar bond strength. The thesis also investigated the effects of using different casting moulds and curing methods on mortar strength. The results showed that the porosity of lime mortar was one of the reasons it was a success in the past and why it was so important nowadays to use it in the restoration and conservation of historic buildings.
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KRUTZ, JILL E. "DESIGN OF A HYDRAULIC ACTUATOR TEST STAND FOR NON-LINEAR ANALYSIS OF HYDRAULIC ACTUATOR SYSTEM." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990813095.
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Thiele, Elizabeth Anne. "Culvert Hydraulics: Comparison of Current Computer Models." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1727.pdf.
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Shumate, Eric Dean. "Experimental Description of Flow at an Open-Channel Junction." Thesis, University of Iowa, 1998. https://ir.uiowa.edu/etd/5368.
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Leutenegger, Paolo, Sebastian Braun, Markus Dropmann, Michael Kipp, Michael Scheidt, Tobias Zinner, Hans-Peter Lavergne, and Michael Stucke. "The Liebherr Intelligent Hydraulic Cylinder as building block for innovative hydraulic concepts." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200639.
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We present hereafter the development of the Liebherr Intelligent Hydraulic Cylinder, in which the hydraulic component is used as smart sensing element providing useful information for the system in which the cylinder is operated. The piston position and velocity are the most important signals derived from this new measuring approach. The performance under various load and temperature conditions (measured both on dedicated test facilities and in field in a real machine) will be presented. An integrated control electronics, which is performing the cylinder state processing, additionally allows the synchronized acquisition of external sensors. Providing comprehensive state information, such as temperature and system pressure, advanced control techniques or monitoring functions can be realized with a monolithic device. Further developments, trends and benefits for the system architecture will be briefly analyzed and discussed.
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Capelo, António João Costa. "Relatório Integrador da Atividade Profissional. As infra-estruturas dos aproveitamentos hidroagricolas. Estudos e Projetos." Master's thesis, ISA, 2014. http://hdl.handle.net/10400.5/7065.
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Mestrado em Engenharia Agronómica - Ramo de Engenharia Rural / Instituto Superior de AgronomiaOver the last 26 years, my professional career has been directed towards consultation in the fields of agricultural hydraulics and rural development. A great part of it is dedicated to studies and designs of hydraulic structures, envisaging the expansion and progress of the agrarian activity in Portugal. Reference is made to the internationalization of my activities, achieved though the development of studies and designs, master plans, expertise advice, training and specialized technical assistance to senior management technicians. Obtaining a M.Sc. Degree and exposing the studies, designs and works in which I have been involved in, comprises the main objective of this report. The report is structured around the methodologies used in the preparation of studies of hydraulic structures, highlights the most relevant design aspects and a few construction details. During the preparation of this report, groups of activities considered relevant to the author’s career were selected, such as: The “Empreendimento de Fins Múltiplos de Alqueva”, the Rehabilitation of Upgrading of Irrigation Perimeters, Studies and Designs of other nature, Master Plans, Expertise Advice and Training. Emphasis is placed upon construction and operation aspects that were especially decisive for the success of such undertakings. The most important aspects that corroborate my experience are highlighted within each activity included in this report
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Hardell, Henrik, and Niclas Lind. "Streamlining of Hydraulic Testing." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-15439.
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ST Aerospace located at Arlanda airport maintain and repair aircraft components. The maintenance activities that the workshop conducts require testing of the component’s function. For a long time the repair shop has experienced problems with the efficiency in this hydraulic testing. The efficiency problems are partially derived by the fact that the manufacturer’s component maintenance manuals (CMM) are not adapted to the specific test equipment that the shop uses. A lack of suitable training material also causes problems for new operators. The purpose of this thesis work was therefore to streamline this part of ST Aerospace’s operation, first by rewriting the test section of the manuals but also to produce a basic description of the test bench that is used in the testing activities. By studying the operator’s work with component testing a fundamental understanding of the test bench was obtained along with the specific knowledge that was required in order to rewrite the manuals to a version that ST can use with their specific test equipment. Along with the training material a total of four rewritten component manuals were produced on ST’s behalf. Since the purpose of this work was to streamline the company’s entire testing business, there are post-doubts about whether the correct way to address the issue was chosen. As the work continued it became increasingly more obvious that a more appropriate way of handling the efficiency problems should have been to fully focus on the training material for the test bench. By performing the work this way around the future rewriting of the hundreds of component manuals can be drastically simplified and more efficient, therefore the time required for rewriting can be drastically reduced.ST Aerospace på Arlanda underhåller och reparerar flygplanskomponenter. I de underhållsåtgärder som verkstaden bedriver krävs testning av komponenternas funktion. Under en lång tid har verkstaden upplevt problem med effektiviteten i denna hydrauliska provning. Problemen med effektiviteten härstammar till viss del av att komponenttillverkarens testningsmanualer inte är anpassade till den specifika testutrustning som verkstaden använder sig av. Problemen härstammar också till viss del av att verkstaden haft problem med att utbilda nya operatörer av testutrustningen då lättförståeligt utbildningsmaterial till den avancerade utrustningen saknats. Syftet med detta examensarbete var därför att effektivisera denna del av ST Aerospace:s verksamhet genom att dels skriva om manualers testavsnitt men även att tillverka en lättförståelig beskrivning av verkstadens testutrustning i utbildningssyfte. Genom att följa operatörerna i deras arbete med av företaget utvalda komponenttester kunde en grundläggande förståelse både för testbänken men även för de utvalda testerna erhållas. Erfarenheten från testningen användes till att producera en lättförståelig beskrivning av provbänken samt till omskrivning av de utvalda komponentmanualerna. Utöver utbildningsmaterialet producerades totalt fyra omskrivna komponentmanualer för ST:s räkning. Då syftet med arbetet var att effektivisera hela ST:s provningsverksamhet är det i efterhand tveksamt till om angripningssättet av effektiviseringsproblemen varit rätt. Alltefter arbetets gång insågs i ökande grad att ett mer lämpligt angripningssätt hade varit att lägga all arbetstid på utbildningsmaterialet till provbänken för att på så sätt förenkla de framtida omskrivningarna av komponentmanualer. Ett mer utförligt utbildningsmaterial till testutrustningen kan effektivisera produceringen av omskrivna komponentmanualer betydligt då företaget i dagsläget testar hundratals komponenter.
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Driss, Slim. "Hydraulic design of culverts." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28377.
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Culverts are designed to carry water from one side of an embankment to another. There are many culverts under a typical highway and they add significantly to its cost. The hydraulic design of a culvert is surprisingly complex and since its primary purpose is to convey water, it is important that it has the full intended flow capacity. The objective of this thesis was to develop a computer program to help an engineer with the hydraulic design of culverts. The user of the program can choose between designing a new culvert or checking the adequacy of an existing culvert from a hydraulic, point of view. The program handles the problem of sediment deposition that can occur and reduce the capacity of culverts having gentle slopes. The most widely used culvert shapes are included in the program and in this thesis. Comments are provided on the conditions under which certain shapes are best. Culvert inlets are given, and some improved inlet designs are presented since the inlet design can have a major impact on the cost of the culvert. Also, erosion at the culvert outlet is discussed and suggestions are provided on how to prevent it or cope with it.Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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Malère, João Pedro Pinheiro. "Hydraulic actuator failure prognostics." Instituto Tecnológico de Aeronáutica, 2007. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=970.
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This work presents an application of failure prognosis in the system command actuator of a commercial aircraft. An efficient failure prognostic algorithm provides a reduction in the number of unscheduled events and consequently generates a significant reduction in the maintenance costs. Although this is a simulation-based work, it presents a pre validation with bench tests data. The method starts by computational mathematical modeling of the system and this further validation by laboratory results. The sensitivity study of the variables is necessary in order to understand which parameters affect the system. The estimation of a confidence interval to determine the nominal behavior failure allows detection and isolation. Parity state techniques will be used for the residue signals design which will be the of the degradation measurement. A simulation of the failure behavior over the time to forecast when the system will reach a determined threshold is also presented.
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Elfving, Maria. "Hydraulic closed loop control." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234932.
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The purpose of the thesis work is to investigate methods for closedloop control of hydraulic pressure in transmissions to make them bemore precise. This is desirable since it decreases the fuel consumptionas well as emissions, and improves the driving performance.To be able to study the behaviour of the transmission, a Simulink modelis designed with the parts relevant to the problem, and from this a linearmodel is obtained. Three different controllers are designed andimplemented in the Simulink model, to compare and analyze differentsolutions. The controllers implemented are a PI controller, a PIDcontroller and a LQR controller.The results from the simulation with the different controllers showstep responses to be able to evaluate their individual performance. Theresults show that all of the controllers meet the requirements for a stepreponse under better conditions, but under worse ones the LQR controllerperforms best of the three. The LQR controller is therefore themost suitable of the three controllers for this particular problem.Syftet med det här examensarbete är att undersöka olika metoder för återkopplad reglering av hydrauliskt tryck i en transmission för att göra det mer exakt. Detta är önskvärt eftersom det minskar bränsleåt- gången och utsläpp, och gör även körupplevelsen bättre. För att kunna studera transmission tas en Simulink-modell fram in- nehållande de delar som är relevanta för problemet, och från detta kan en linjär modell erhållas. Tre olika regulatorer tas fram och im- plementeras i Simulink-modellen, för att kunna jämföra och analysera de olika lösningarna. De regulatorer som tas fram är PI-regulator, PID- regulator och LQR-regualator. Resultaten från simuleringen med de olika regulatorerna visar stegs- var under varierande förutsättningar för att kunna utvärdera hur de presterar. Resultaten visar att alla regulatorer uppfyller kraven på ett stegsvar under bättre förhållanden, men LQR-regulatorn presterar bäst under svårare förhållanden. LQR-regulatorn är därför den mest relevanta reglerstrategin för det här problemet av de tre
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Nilsson, Daniel. "Tribology of hydraulic motor." Licentiate thesis, Luleå : Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/2760914.
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Pavelka, Roman. "Hydraulické posunovače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229740.
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This diploma thesis deals with the mechanical proposal of hydraulic puller. Furthermore, it includes the detail design solutions. The project also includes the calculation of the hydraulic puller parameters: maximum pushing force is 60 kN, speed of movement is 0.1 m s-1. This work also contains of stress analysis FEM with I-DEAS software. Following part deals with the design of hydraulic circuit for driving puller. At the end of work there are options for replacements of hydraulic puller by mechanical systems.
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Hájek, Ondřej. "Alternativy řešení plošinového zvedáku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229367.
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The aim of this thesis is to analyze the possibility of mechanical design platform lifts. Proposal lifting platform with mechanical and hydraulic drive with a capacity of 3500 kg and lift 600 mm. The work is mainly focused on design and strength calculation mechanism and structure. Proposal hydraulic circuits and the development drawings for both types of drive.
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Mikula, Martin. "Hydromobil - návrh hydraulické části a převodu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230012.
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This thesis covers the design and the construction of vehicle, which is powered by pressured fluid. The vehicle has driving system based on mechanical – hydraulic recuperation of kinetic energy during braking of vehicle. Her secondary part is used only by the start of vehicles. The thesis describes possibilities of kinetic energy recovery and in more detail explaines kinetic energy recovery with use of hydraulic systems and their practice use. The main part of the thesis contains a design of hydromobil with demonstration of individual options in outline. The selection of the whole hydraulic connection and transmission is described in detail as well as the construction of particular components of the vehicle.
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Emnerud, Tobias, and Katarina Svensson. "Energy Optimization of Hydraulic Systems : An investigation of energy-efficient designs for hydraulic systems." Thesis, Högskolan i Skövde, Institutionen för teknik och samhälle, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-5364.
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An investigation of the global energy consumption debate confirms the complexity of the global environmental issues, the severity of the impact in developing countries and the major efforts that is required to discourse this development. Electricity production is the largest growing source of CO2- emissions, mainly due to the expansion of coal power plants in China and India. Therefore one can easily argue for the importance of develop more environmentally friendly use of coal. However, the cheapest measure to reduce CO2-emissions is not to develop new technologies but to use the produced energy more effective, regardless of energy source. In this final thesis in mechanical engineering investigates the possibilities of modifying two hydraulic systems in an energy efficiency perspective. The investigations will show if there is potential for implementing energy-saving investments in hydraulic systems. Two hydraulic units that are representative for the hydraulics at Sandvik Materials Technology were chosen. One unit controls a hydraulic system that moves steel bars through an oven, and the other unit drives machines that straighten crooked tubes. Pressure-measurements and calculated flow demands showed that both systems had potential for energy efficiency work. By the use of accumulators four different concepts have been developed. With an investment analysis as a basis, one concept per system has been considered profitable. For the system referred to as the tube-straightener a concept that uses two pumps and motors of two different sizes has been considered profitable. The thought is to let the smaller pump and motor take the base-load of 2 kW that is used when the motor is idle-running. A timer shuts the machine after 25 seconds, which is where the profitability of the concept is found. Hence, large energy consumption savings can be achieved just by changing the time set on the timer. With the modifications that are represented in this thesis, the energy consumption is decreased by 45 %.The potential for energy efficiency work is thereby confirmed. However, the analyzed systems are too small to generate a short pay-back time. If similar modifications are performed on larger units, the pay-back time will drop dramatically. In the most economic viable concept for the hydraulic system referred to as the oven, one of the existing three pumps is removed. The two remaining pumps control two different flow different demands. One pump manages the flow demand of one cylinder with a high demand. The other pump manages the remaining flow demand with the help of installed accumulators. The motors are replaced since the current motors are oversized. This investment has a payback period of 2.7 years and will reduce the energy consumption by 25% which corresponds to approximately SEK 25 000. Furthermore, the eyes are lifted from the specific systems that have been subjected to this analysis and underlying factors of over dimensioned hydraulic systems in today´s industries are brought up. Incentives that affect the constructor’s decisions play an important part in the underlying factors that is presented. As long as the constructor is punished to a greater extent for undersized systems than he or she is rewarded for designing smaller, more energy efficient systems, this problem will remain. Another aspect that is brought up is the time limit, when the time limit is set very short the risk of losing precision in estimation of needed system capacity increases.En undersökning av den globala energidebatten bekräftar den komplexitet som kännetecknar de globala miljöproblem och den ansträngning en förändring av dagens energianvändning skulle kräva. Elproduktion är den störst växande källan till koldioxidutsläpp, i huvudsak som en följd av expansion av kolkraftverk i Kina och Indien. Därav är det enkelt att argumentera för vikten av att utveckla nya tekniker för att på ett mer miljövänligt sätt kunna använda kol, då det är ytterst otroligt att Kina och Indien kommer att låta bli att använda dessa resurser med hänsyn till annalkande miljöhot. Det billigaste medlet för att minska all typ av koldioxidutsläpp är dock inte att utveckla nya tekniker för att kunna öka elproduktionen utan att använda redan producerad el på ett smartare sätt, oavsett vilken typ av energikälla som avses användas. I detta examensarbete i maskinteknik undersöks möjligheterna för att modifiera två hydraulsystem ur ett energieffektivt perspektiv. Dessa undersökningar ska visa om det finns besparingspotential i energieffektivisering av de undersökta hydraulsystemen. Två system som är representativa för hydralsystemen på Sandvik Material and Technology valdes. Ett system driver en maskin som riktar krokiga rör och det andra systemet förflyttar stålämnen genom en ugn. Tryckmätningar och beräknade flödesbehov visade att båda systemen kunde energieffektiviseras. Genom att använda ackumulatorer utvecklades två olika koncept per system. En investeringsanalys avgjorde vilket av koncepten som är mest lönsamt. För rikten fås ett koncept med två motorer och pumpar av två olika storlekar som den mest lönsamma lösningen. Grundidén är att låta den mindre pumpen och motorn ta baslasten på 2 kW som behövs då maskinen körs på tomgång. Idag sitter det en timer inställd på femton minuter på dessa maskiner, i konceptet har denna tid kortats till 25 sekunder. Det är också här som lönsamheten i detta koncept kan hittas. Därmed skulle besparingar i elkonsumtion kunna göras genom att bara ändra tiden som timern är inställd på. Med de förändringar som har presenterats här så minskas energiförbrukningen med 45 %, att besparingspotential finns har därmed bekräftats. Det undersökta systemet är dock för litet för att visa en kort pay-back tid, men om modifikationerna appliceras på större system så kommer återbetalningstiden att kortas drastiskt. I det mest lönsamma konceptet för stegbalksugnen tas en av de nuvarande tre pumparna bort. För att jämna ut flödesbehovet används en pump endast till en cylinder med högt flödesbehov. Den kvarvarande pump klara av det resterade flödesbehovet med hjälp av ackumulatorer. Även motorerna ersätts då de nuvarande är överdimensionerade för pumparna. Denna investering har en pay-back tid på 2,7 år. Denna investering minskar energiförbrukningen med 25 % vilket motsvarar ca 25 000 kr. Vidare höjs blicken från de specifika system som är föremål för denna analys och frågan om bakomliggande faktorer till de överdimensionerade system som finns att hitta inom industrin idag tas upp. De incitament som påverkar konstruktörens beslut spelar en viktig roll i de bakomliggande faktorer som läggs fram i den här rapporten. Så länge som konstruktören straffas mycket hårdare för att underdimensionera än att överdimensionera system så kommer problemen att bestå. En annan aspekt som tas upp är tidsaspekten, när tiden för projektering sätts tajt finns risk att noggrannhet i uppskattning av vilken kapacitet som krävs av aggregatet försvinner.
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Bartošek, Jindřich. "Design of a robotic cell for hydraulic pipes moulding." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228603.
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Předmětem této diplomové práce je návrh robotické buňky pro tvarování hydraulických trubek. Práce obsahuje analýzu technologie tvarování trubek a zdůvodnění potřeby automatizace celého procesu. Z návrhů jednotlivých konstrukčních uzlů byly vybrány nejvhodnější řešení a ty pak byly aplikovány při konstrukci buňky. Robotická buňka byla navržena s ohledem na bezpečnost provozu, funkčnost a jednoduchou ovladatelnost. Na závěr je vypracováno ekonomické zhodnocení projektu. K práci je přiložen návod pro ovládání, výkresová dokumentace, model buňky a výsledky simulace.
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Larsson, Felix, and Christian Johansson. "Digital hydraulic actuator for flight control." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-165262.
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In aviation industry, one of the most important aspects is weight savings. This since with a lowered weight, the performance of the aircraft can be increased together with increased fuel savings and thus lowered running costs. One way of saving weight is to reduce energy consumption, since with lowered energy consumption, lowered mass of fuel is required etc. Most aircraft are today maneuvered with hydraulic systems due to its robustness and power density. It is the primary source of power for primary and secondary flight controls. The control of a conventional system which is using proportional valves is done by altering flow by restricting it to the extent where the desired output is achieved, which implies heat losses since the full performance of its supply is wasted through the valve. In previous research, more energy efficient hydraulic systems called digital hydraulics has been investigated. In difference with conventional hydraulics, digital hydraulics uses low cost, high frequency on/off valves, which either are fully opened, or fully closed, instead of proportional valves to achieve the desired output. With this comes the benefit of no energy losses due to leakage and restriction control. The downsides with digital hydraulics is the controlabillity. One way of controlling it is by using several pressure sources which outputs different pressure levels. By using the on/off valves in different combinations, different outputs can be achieved in a discrete manner. In this thesis, the aim was to remove the impact of the discrete force steps which are present in digital hydraulics by creating concepts with hybrid solutions containing both digital hydraulics and restrictive control. Three concepts were developed and investigated using simulation. The energy consumption and performance was analysed and compared with a reference model, the concepts redundancy compared to conventional systems was discussed and finally the concepts were tested with an aircraft simulation model. The concepts were found to reduce the energy consumption with different magnitude depending on the load cycle. The performance was found to be almost as good as the reference model. The redundancy compared with conventional systems should be possible to maintain with slight modifications, but further investigation is needed. It was found that one of the most important aspects regarding energy consumption is which combination of supply pressures is used to supply the system since it influences leakage and flow due to compression.
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Thapa, Bhola. "Sand Erosion in Hydraulic Machinery." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-302.
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The topic of this thesis is damage of hydraulic machinery due to sand erosion. This is a very broad topic in which all the aspects of design of hydraulic machinery namely material selection; mechanics of material and hydraulics are involved. The issue of sand erosion is equally important for operation and maintenance of hydropower plants.
The erosion damage of turbines of hydropower plants in Himalayan Rivers, in particular in Nepal, due to high sediment contents in river is a motivating factor for this research. The findings of this study are believed to help to reduce erosion of turbine components, increase their life time and improve maintenance procedure.
The objectives of this study are to:
1. Study the erosion process on different materials and compare lifetime of turbine material with hard surface coating.
2. Study the flow in the turbine and identify the region of highest velocity and acceleration where most serious sand erosion occurs.
3. Study erosion rate of turbine as a function of operating parameters (head and speed), particle characteristics and turbine material.
4. Assess loss of efficiency and to analyze repair method and repair interval that gives optimal economy of the hydropower plants.
The goals laid out in the objectives are achieved by understanding the theory of erosion of material through literature, investigating the nature of turbine damage from field observation and finally by experiments to study effect of variables of erosion rate and investigation of particle separation process in rotational flow.
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Chang, Hong. "Hydraulic Fracturing in Particulate Materials." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4957.
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For more than five decades, hydraulic fracturing has been widely used to enhance oil and gas production. Hydraulic fracturing in solid materials (e.g., rock) has been studied extensively. The main goal of this thesis is a comprehensive study of the physical mechanisms of hydraulic fracturing in cohesionless sediments. For this purpose, experimental techniques are developed to quantify the initiation and propagation of hydraulic fractures in dry particulate materials. We have conducted a comprehensive experimental series by varying such controlling parameters as the properties of particulate materials and fracturing fluids, boundary conditions, initial stress states, and injection volumes and rates. In this work, we suggest principle fundamental mechanisms of hydraulic fracturing in particulate materials and determine relevant scaling relationships (e.g., the interplay between elastic and plastic processes).
The main conclusion of this work is that hydraulic fracturing in particulate materials is not only possible, but even probable if the fluid leak-off is minimized (e.g., high flow rate, high viscosity, low permeability). Another important conclusion of this work is that all parts of the particulate material are likely to be in compression. Also, the scale effect (within the range of the laboratory scales) appears to be relatively insignificant, that is, the observed features of fractures of different sizes are similar.
Based on the observed fracture geometries, and injection pressures we suggested three models of hydraulic fracturing in particulate materials. In the cavity expansion or ??e driving model, the fracturing fluid is viewed as a sheet pile (blade) that disjoints the host material, and the cavity expansion occurs at the fracture (blade) front. The shear banding model is also consistent with a compressive stress state everywhere in the particulate material and explains the commonly observed beveled fracture front. The model of induced cohesion is based on the fluid leak-off ahead of the fracture front. The induced cohesion may be caused by the tensile strain near the fracture tip (where the stress state is also compressive), which, in turn, induces the cavitation of the leaked-off fluid and hence capillary forces.
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Yilmaz, Aslican Nazli. "Hydraulic Characteristics Of Tyrolean Weirs." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612780/index.pdf.
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Tyrolean type water-intake structures are widely used on mountain rivers to provide water to hydropower stations. The main concern encountered in these kinds of structures is the amount of water diverted from the main channel and sediment carried by this flow. The diverted flow should not be less than the design discharge of the hydropower station and the amount of the sediment entering the hydraulic system should be minimum. In this study a physical model of a Tyrolean weir was constructed at the Hydromechanics Laboratory and by varying the dimensions of the various components of this systemthe length, the inclination angle of the rack and the distance between the rack bars, the amount of water and sediment entering the system were measured for a wide range of discharges. The experiments were conducted in two stages. In the first stage the tests were made with only water, and in the second stage, water and sediment having different gradation were used. Applying dimensional analysis to the related parameters of the system dimensionless terms were defined for water capture efficiency and discharge coefficient of the system, and their variations with the relevant parameters were plotted. Using these diagrams one can determine the amount of water to be diverted by a Tyrolean weir of known geometry and main channel flow.
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Sadeghi, Mohammadreza, and Rezaii Ali Mohammed Fahimi. "Hybrid Electric & Hydraulic Drivers." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-71035.
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The environmental impact of fossil fuel consumption has been a significant issue over the last decade. Mainly because of public awareness, increased fuel cost and stricter legislation. Today’s technological improvements have reduced fuel consumption and also emission of vehicles considerably. One of the most important solutions to this problem is hybridization. Hybridization in vehicle is using two or more distinct power sources. Additionally, the main objective of hybridization in vehicle is improving the fuel consumption and reducing hazardous air pollutants without lowering vehicle performance and other satisfaction criteria. Development of hybridization systems can be fallen into two categories: electric and hydraulic hybrids. This project illustrates performances of HHV (hybrid hydraulic vehicles) and HEV (hybrid electric vehicles) in NEDC (New European Driving Cycle) and 10-15 mode (Japanese Driving cycle) by using simulation models, which has been done by the LMS Imagine Lab Amesim rev 7 thand 8th. The following paper compares HRB (hydraulic regenerative braking system) as a hydraulic system and a parallel hybrid electric system (HEV) with the Nickel-metal hydride (NiMH) battery on the light weight vehicle (1 ton). Results show higher performance in HEV, about 13.7% during NEDC and 25.4% during (10-15) improvement in fuel consumption although high energy density and low power density are inherent battery characteristics. Also, all the evidence point to high cost components and short- life time. The HRB model saves around 11% during NEDC and 23.3% during 10-15Mode in fuel consumption in addition to high power density and low energy density .In other words, limitation for accumulating energy is an intrinsic system character. However, high response, low component cost and weight with long life time are advantages of HRB. Two problems exiting in HRB model are: firstly, the necessity of using big size pumps for fully charging hydraulic accumulators that would be impossible in a light vehicle; and secondly the limitation of capturing huge amount of energy in accumulators. In this paper the attempt is made to explicate some of the brand new solutions to alleviate some of these weak points.
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Pak, Ali. "Numerical modeling of hydraulic fracturing." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21618.pdf.
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El-Alfy, Sadek E. "Hydraulic mining in cold regions." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270485.
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Williams, T. D. "Oil flow in hydraulic buffers." Thesis, Coventry University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386179.
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Cattley, Robert. "The contra-rotating hydraulic turbine." Thesis, Lancaster University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539635.
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Axin, Mikael. "Mobile Working Hydraulic System Dynamics." Doctoral thesis, Linköpings universitet, Fluida och mekatroniska system, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-121070.
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This thesis deals with innovative working hydraulic systems for mobile machines. Flow control systems are studied as an alternative to load sensing. The fundamental difference is that the pump is controlled based on the operator’s command signals rather than feedback signals from the loads. This control approach enables higher energy efficiency and there is no load pressure feedback causing stability issues. Experimental results show a reduced pump pressure margin and energy saving potential for a wheel loader application. The damping contribution from the inlet and outlet orifice in directional valves is studied. Design rules are developed and verified by experiments. A novel system architecture is proposed where flow control, load sensing and open-centre are merged into a generalized system description. The proposed system is configurable and the operator can realize the characteristics of any of the standard systems without compromising energy efficiency. This can be done non-discretely on-the-fly. Experiments show that it is possible to avoid unnecessary energy losses while improving system response and increasing stability margins compared to load sensing. Static and dynamic differences between different control modes are also demonstrated experimentally.
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Hölcke, Jan. "Frequency response of hydraulic hoses." Licentiate thesis, KTH, Maskinkonstruktion, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1411.
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Hoses can be components of fluid power control systems. To determine the dynamic behaviour of such systems you need to know the dynamic properties of the components included. This investigation aims to develop a method to determine these properties of hoses. Nitrile-black-carbon is used in hydraulic hoses. A literature study gives that rubber is a very complex material. It is viscoelastic with a lot of non-linearities so it is not self-evident how to model the hose. Four different models are studied. One of them gives an idea of the static relation between the rubber tube and the reinforcing. Two of them take the dynamic properties of rubber into account. The fourth model is a second order black box model. Laboratory tests have been done. The relationship between pressure changes and volume changes in hydraulic hoses at different frequencies is measured. Two seated valves were used, one for increasing and one for decreasing the pressure in the hose. The volume of oil coming out from the hose was measured with a cylinder. Three different hoses are tested. The test results agree rather well with one of the dynamic rubber models and with the black box model, useful for control system analysis.QC 20150917
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Day, Rodney Allen. "The hydraulic characteristics of culverts." Thesis, University of Hertfordshire, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358345.
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Soom, Mohd Amin Mohd. "Hydraulic analysis of trickle lateral." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277631.
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Tatsis, A. "Hydraulic conveying of metallic platelets." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46749.
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