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Dissertations / Theses on the topic 'Hydraulic Structures Design'
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1
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
2
Farouk, Mohamed Ismail. "Design of hydraulic structures with plane intermediate filters." Thesis, University of Manchester, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510438.
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Hydraulic structures should be secured against uplift pressure and piping. Design engineers, therefore, may provide these structures with different features such as intermediate filters to establish safer and/or more economic structures. One or more intermediate filters can be built within the floor. In this research, the problem of seepage flow beneath hydraulic structures with two plane intermediate filters over a homogenous soil has been deduced analytically using the conformal mapping technique. The solutions include the potential heads at both key and stagnation points, the hydraulic exit gradient just downstream the floor, and the location of the stagnation points. The results have been used to create design charts over a wide range of variables. Then, the general steady-state seepage problem beneath a floor of hydraulic structure having any shape provided with any number of filters and cut-offs located anywhere over a heterogeneous soil has been obtained using a finite element model. After calibrating the model, it has been applied to solve the same problem studied analytically using conformal mapping to confirm both solutions and to determine the adequacy of the numerical solution for potential heads, exit gradient and location of the stagnation points. Good agreement between both solutions has been obtained confirming the accuracy of the numerical solution. Then the model has been used to check the stability against uplift and piping for New Esna Barrage on Nile River in Egypt as one of the existing barrage, which has been provided with one intermediate filter. After the stability of the barrage against these forces has been confirmed, many alternative designs for its floor have been studied to investigate where the exist solution from the optimum one. These alternative designs include different lengths and location for the filter and an upstream cut-off with different depths. Finally the finite element model has been applied over a wide range of variables for a comparison study between the effect of using one and two plane filters upon uplift pressures, hydraulic exit gradients and seepage discharges
3
Boulineau, Sheryl Taillon. "East Lake Meadows : hydrologic strategies for architecture." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/23366.
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Hodgkinson, Derek Anthony Martin. "Computer graphics applications in offshore hydrodynamics." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26705.
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The results of hydrodynamic analyses of two problems involving offshore structures are displayed graphically. This form of presentation of the results and the liberal use of colour have been found to significantly help the ease in which the results are interpreted.
For the transformation of waves around an artificial island, a time history of the evolution of the regular, unidirectional wave field around an artificial island is obtained. Through the use of colour, regions in which wave breaking occurs have been clearly defined. The numerical technique used is based on the finite element method using eight noded isoparametric elements. The determination of the transformed wave field takes wave breaking, wave refraction, diffraction, reflection and shoaling into account. The graphical display is achieved by using a plotting program developed for the output of finite element analyses.
The motions of a semi-submersible rig are computed from the RAO curves of the rig, used to obtain its' small response in a random sea. The numerical technique used in the analysis assumes that the vertical members are slender and may be analysed using the Morison equation whereas the hulls are treated as large members which are discretised and analysed using diffraction theory. The discretisation of the cylinders and hulls together with the time history of the rig's motions are displayed graphically. Once again, the graphical display is plotted using a program developed for the output of finite element analyses for four noded elements. In this case, a finite element technique has not been employed but the results were ordered to act as though this is the case. The slender members (cylinders) and large members (hulls) are clearly distinguishable by using different colours. The elements used in the analysis are also clearly shown.
The VAX 11/730 system was used to obtain the results shown. A video tape, using the results of a time stepping procedure, was made by successively recording the hardcopies produced by the VAX printer. The time stepping could also be seen, in real time, on the IRIS.Applied Science, Faculty of
Civil Engineering, Department of
Graduate
5
Bester, J. W. "Steps as hydraulic roughness elements in segmentally lined tunnels." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53062.
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Thesis (MEng)--University of Stellenbosch, 2002.ENGLISH ABSTRACT: Segmentally lined tunnels are increasingly being built to transfer water from one water scheme to another. The segments that line such tunnels are often in the form of pre-cast concrete sections, which are placed around the perimeter of the tunnel. As these tunnels are very expensive to construct, it is imperative that their hydraulic capacities can be calculated accurately. Even a slight variation in the design diameter has a significant effect on the cost of the tunnel. Due to the construction method involved, alternative segments are not always properly aligned. This creates roughness elements in the tunnel commonly known as steps. These steps occur randomly and vary in size. Since the steps lead to increased roughness and thus decrease the hydraulic capacity of the tunnel, it is essential that this effect be allowed for in the design of the tunnel. A hydraulic model was used to determine the contribution of steps to the hydraulic roughness, according to step size and frequency of steps.
AFRIKAANSE OPSOMMING: Tonnels word al hoe meer gebou om water tussen waterskemas te vervoer. Die voering van sulke tunnels word dikwels saamgestel uit voorafvervaardigde beton panele wat geplaas word om 'n huls langs die omtrek van die tonnel te vorm. Aangesien hierdie tonnels geweldig duur is om te bou, is dit uiters noodsaaklik dat die hidrouliese kapasiteit van 'n tonnel akkuraat bereken kan word. 'n Klein variasie in die diameter van die tonnel het 'n betekenisvolle effek op die koste daarvan. Die konstruksiemetode van sulke tonnels veroorsaak dat opeenvolgende panele nie altyd presies oplyn nie. Sulke afwykings in die belyning van die tonnelpanele veroorsaak klein trappies, wat bydra tot die ruheid in die tonne I en sodoende die kapasiteit daarvan laat afneem. Die afwykings varieer in grootte en kom in geen spesifieke patroon voor nie. 'n Modelstudie is uitgevoer om die bydrae wat die afwykings in the belyning van die opeenvolgende ringe tot die hidrouliese weerstand maak, te bepaal.
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Chukwuka, Echezonachukwu Chukwuemeka. "Risk based design, maintenance and inspection of marine and offshore structures, with particular reference to fatigue analysis." Thesis, Liverpool John Moores University, 2011. http://researchonline.ljmu.ac.uk/6019/.
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Fagan, Tony Duane. "Effect of membrane weight on vibrations of air-inflated dams." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/91167.
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Inflatable dams are flexible membrane structures, pressurized with either air, water, or both, which have been used in recent years as a means of temporarily impounding water. A number of procedures have been developed to investigate the static behavior of the dams, but the dynamic behavior has been largely neglected. The few studies that have been done on dynamic behavior have used the simplifying assumption that the weight of the membrane was negligible.
In this study, equations of equilibrium and equations of motion were derived for an air inflated dam impounding no water, but loaded with its own membrane weight. It was assumed that the effect of membrane extensibility is negligible in the analysis. Derivatives required in the equations of motion were approximated using finite difference equations. Computer programs were written to find solutions for the eigenvalues and eigenvectors of the equations of motion. The computer program plotted the mode shapes of vibration associated with the four lowest eigenvalues, as well as the static shape of the dam. The eigenvalues obtained were the square of the frequencies of the system, so the effects of a series of membrane weights on the frequencies of dams of various base lengths could be analyzed.M.S.
8
Al-Faesly, Taofiq Qassim. "Extreme Hydrodynamic Loading on Near-Shore Structures." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34179.
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The main objective of this study was to investigate and quantify the impact of extreme hydrodynamic forces, similar to those generated by tsunami-induced inundation, on structural elements. As part of a comprehensive experimental program and analytical study, pressures, base shear forces, and base overturning moments generated by hydraulic bores on structural models of various shapes were studied. In addition, the impact force induced by waterborne wooden debris of different shapes and masses on the structural models was also investigated. Two structural models, one with circular and the other with square cross-section, were installed individually downstream of a dam-break wave in a high-discharge flume. Three impounding water heights (550, 850 and 1150 mm) were used to produce dam-break waves, which have been shown to be analogous to tsunami-induced coastal inundation in the form of highly turbulent hydraulic bores. Time-history responses of the structural models were recorded, including: pressures, base shear forces, base overturning moments, lateral displacements, and accelerations. In addition, the flow depth-time histories were recorded at various locations along the length of the flume. Regular and high-speed video cameras were used to monitor the bore-structure interaction. The effect of initial flume bed condition (“wet” or “dry” bed) on the forces and pressures exerted on the structural models were also investigated. Moreover, the vertical distribution of pressure around the models was captured. Simple low-height walls with various geometries were installed upstream from the structural models to investigate their efficiency as tsunami mitigation measures. The experimentally recorded data were compared with those estimated from currently available formulations.
The results and analysis of the simulated tsunami-induced bore presented in this study will be of significant use to better estimate forces exerted on structures by tsunami-induced turbulent bores. It is expected that this work will contribute to the new ASCE7 Chapter 6 - Tsunami Loads and Effects in which two of this author’s academic supervisors, Drs. Ioan Nistor and Dan Palermo, are members.
9
Larson, John P. "Design of a Magnetostrictive-Hydraulic Actuator Considering Nonlinear System Dynamics and Fluid-Structure Coupling." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1402566309.
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Kannikanti, Rajesh. "An android application for the USDA structural design software." Kansas State University, 2013. http://hdl.handle.net/2097/15977.
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Master of ScienceDepartment of Computing and Information Sciences
Mitchell L. Neilsen
People are more inclined to use tablets instead of other computing devices due to their portability and ease of use. A number of desktop applications are now becoming available as tablet applications, with increasing demand in the market. Android is one of the largest and most popular open source platforms that offer developers complete access to framework APIs in order to develop innovative tablet applications. The objective of this project is to develop an Android application for the U.S. Department of Agriculture (USDA) Structural Design Software. The GUI for this software is developed to run on tablet devices powered by Android platform. The main features provided by the User Interface include: • Allowing the input to be saved in ASCII text format and displaying the simulation results in PDF format • Allowing the user to select the type of project or view help contents for the projects • Allowing the user to build the simulation for the selected type of project • Allowing the user to send the simulation results to an e-mail The backend for this software is supposed to replace the old FORTRAN source files with Java source files. FORTRAN to Java translation is performed using the FORTRAN to Java (F2J) translator. F2J is intended to translate old FORTRAN math libraries, but was not completely successful in translating these FORTRAN programs. To accomplish successful translation, some features (such as Common Blocks, IO operations) were removed from the FORTRAN source files before translation. After successful translation, the removed features were added again to the translated Java source files. The simulation results provided by the software are useful to design engineers to develop new structural designs.
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Cetin, Betul. "Design Of A Demolition Boom." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12608797/index.pdf.
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ABSTRACT
DESIGN OF A DEMOLITION BOOM
Çetin, Betü
l M.S, Department of Mechanical Engineering Supervisor : Prof. Dr. Eres SÖ
YLEMEZ August 2007, 96 pages Excavators are used for many purposes. Some of these are digging, drilling, breaking and demolition. A demolition excavator boom consists of 3-piece boom which is different in form and construction from a 2-piece boom used in standard excavator. The aim of this thesis is to design a demolition boom for hydraulic excavator with operation weight of 30 ton. With this construction a higher reach is gained. Design of the demolition boom consists of three stages. Firstly the mechanism design is performed to determine the basic link dimensions. In the second step the structural shape of the boom is estimated to perform static stress analysis. The EXCEL program is chosen due to the ease of repetative calculations and applying the changes in structure parameters. The demolition boom is modeled by PRO-ENGINEER, and consequently the model is analyzed by using a Finite Element Analysis (FEA) in MSC.Marc-Mentat. According to the FEA results the model is revised. Keywords: Demolition Excavator, Mechanism Design, Structural design
12
Ulbricht, Andreas, Maik Gude, Daniel Barfuß, Michael Birke, Andree Schwaar, and Andrzej Czulak. "Potential and application fields of lightweight hydraulic components in multi-material design." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200294.
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Hydraulic systems are used in many fields of applications for different functions like energy storage in hybrid systems. Generally the mass of hydraulic systems plays a key role especially for mobile hydraulics (construction machines, trucks, cars) and hydraulic aircraft systems. The main product properties like energy efficiency or payload can be improved by reducing the mass. In this connection carbon fiber reinforced plastics (CFRP) with their superior specific strength and stiffness open up new chances to acquire new lightweight potentials compared to metallic components. However, complex quality control and failure identification slow down the substitution of metals by fiber-reinforced plastics (FRP). But the lower manufacturing temperatures of FRP compared to metals allow the integration of sensors within FRP-components. These sensors then can be advantageously used for many functions like quality control during the manufacturing process or structural health monitoring (SHM) for failure detection during their life cycle. Thus, lightweight hydraulic components made of composite materials as well as sensor integration in composite components are a main fields of research and development at the Institute of Lightweight Engineering and Polymer Technology (ILK) of the TU Dresden as well as at the Leichtbau-Zentrum Sachsen GmbH (LZS).
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Coetzee, Gerhard. "'n Aanpasbare energieabsorbeerder vir 'n helikoptersitplek." Thesis, 2014. http://hdl.handle.net/10210/12100.
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M.Ing. (Mechanical Engineering)The development of crashworthy seats for helicopters during the past three decades is discussed. The primary design criteria is mentioned and the disadvantages of crashworthy seats that are currently in use are highlighted. An hydraulic energy absorber which automatically compensates for the mass of the seat occupant was designed and a simulation model was developed. The concept for the control valve used was obtained from WARRICK [25]. Results of the simulations correlated well with those of WARRICK. A prototype of a mechanical/hydraulic accelerometer was designed, manufactured and tested. The results obtained from the experiments compared favourably with simulation values. The simulated and experimental results indicate that the concept of using an hydraulic energy absorber, in a crashworthy seat, is very satisfactory. Future crashworthy seat designs could be enhanced by incorporating this promising device.
14
Visser, Karl Kenton. "Hydraulics of perforated terrace inlet risers." 1986. http://hdl.handle.net/2097/22169.
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Laisi, Elton. "Development of a flood-frequency model for the river basins of the Central Region of Malawi as a tool for engineering design and disaster preparedness in flood-prone areas." Diss., 2016. http://hdl.handle.net/10500/23597.
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Since 1971, a number of flood frequency models have been developed for river basins in
Malawi for use in the design of hydraulic structures, but the varied nature of their results
have most often given a dilemma to the design engineer due to differences in magnitudes
of calculated floods for given return periods. All the known methods for flood frequency
analysis developed in country so far have not used a homogeneity test for the river basins
from which the hydrological data has been obtained. This study was thus conducted with a
view to resolving this problem and hence improve the design of hydraulic structures such
as culverts, bridges, water intake points for irrigation schemes, and flood protection dykes.
In light of the above, during the course of this study the applicability of existing methods
in the design of hydraulic structures was assessed. Also, the study investigated how land
use and land cover change influence the frequency and magnitude of floods in the study
area, and how their deleterious impacts on the socio-economic and natural environment in
the river basins could be mitigatedEnvironmental Sciences
M. Sc. (Environmental Management)
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George, Nathan D. "Evaluation of design and control structure improvements on the bandwidth of the PCRL hydraulic transient dynamometer." 2004. http://catalog.hathitrust.org/api/volumes/oclc/54484540.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 2004.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 104-105).
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Rangaraj, C. "Optimization And Design Of Proportional Weirs." Thesis, 1997. http://etd.iisc.ernet.in/handle/2005/1857.
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Huang, Ching-Chih, and 黃慶智. "Optimal Design of a Machine Tool Hydraulic Energy Saving System Motor and Investigate the Effect of the Stator and Rotor Structure on Motor Performance." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/31879234579875211225.
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碩士逢甲大學
電機工程所
99
A surface-mounted brushless permanent magnet motor (SPM) for machine tool hydraulic energy saving system is designed. First, the magnetic circuit design software is applied to design the prototype of motor. Then, electromagnetic characteristics of the motor are obtained by using the finite element method (FEM). Finally, Taguchi method coupled with the grey relation analysis and fuzzy inference is used to optimize of the torque ripple, the torque to volume of magnet ratio, and the efficiency of the motor. Results are presented to demonstrate the effective and feasible of this approach. Furthermore, five different configurations that included rotor skew, stator skew, two-segment rotor, two-segment stator and two-segment stator shoe structure are investigated to reduce cogging torque, torque ripple, and back-EMF harmonics due to tooth-slot effect.