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Thematische Bibliographien / Damping of pressure pulsations / Dissertationen

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Dissertationen zum Thema „Damping of pressure pulsations“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 29. Juli 2025

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1

Čepl, Ondřej. "Tlumení tlakových pulzací a snižování hluku v potrubních systémech." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444301.

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The diploma thesis deals with pressure pulsations in pipeline system with dynamic muffler. There is presented original geometry of side-branch resonator. Pressure pulsations are solved by a created mathematical model, numerical simulations and verified by an experimental approach. The influence of dynamic and bulk viscosity is involved in derived governing equations. A system of nonlinear equations is solved by genetic algorithm and frequency dependent relationship of bulk viscosity of air is determined afterwards. The correct function of used pressure sensors is tested. The processing of expe

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2

Kobro, Einar. "Measurement of Pressure Pulsations in Francis Turbines." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11715.

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The work presented in this thesis involves preparation and execution of measurements on Francis runners. The measurements were performed by means of onboard measuring equipment both in model runners and full-scale prototype runners. Also, analysis of the measured data, and the discussion of the results, is presented. The measurements resulted in large data sets. These data sets were used by the author to investigate the dynamic pressure and strain in the runners. The results of the analysis can be used as input in future turbine design. Andritz Hydro AG has used the data for verification of th

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3

Branner, James Lester. "Noise due to pressure pulsations in a pressure-balanced sliding vane pump." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101167.

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An experimental investigation of noise in a pressure-balanced sliding vane pump was conducted. The test pump for this research was used in an automobile's hydraulic power steering system. As currently designed, a small portion of the manufactured pumps generate excessive noise during operation. An experimental test stand facility was used to represent a power steering system for analysis of the excessive noise problem with the objective of determining ways to reduce the noise. Through signature analysis techniques, the sliding vane pump noise was related to the pump's pressure pulsations. The

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4

DHANORE, NISHANT. "Impact of Pressure Pulsations on Diesel Air Path Control and Compensation Measures." Thesis, KTH, Maskinkonstruktion (Avd.), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-251023.

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Stricter pollution norms have led to increased efforts to achieve lower emissions. Exhaust Gas Re-circulation (EGR) is a well known measure to reduce NOx internally in the engine. In order to achieve better performance of an engine in terms of emissions it is very essential to control the flow of exhaust gases through EGR valve. Generally, an Engine Control Unit (ECU) uses mean value models or map-based approaches to calculate the mass flow through EGR valve. The main driving factor of the mass flow through an EGR valve i.e. the exhaust gas pressure is continuously fluctuating throughout an en

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Panko, Martin. "Tlumení tlakových pulsací v pružných potrubích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228178.

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This diploma thesis deals with numerical simulation of pressure pulsations in elastic pipes. Continuity relation of fluid in elastic pipes, when calculating some damping in pipe material, is derived into practice. Rheological model of such a pipe corresponds to Voigt (Kelvin) model. For analysing dynamic effects in time periods are used numerical methods that deal with flow of compressible fluid: FTCS, Lax-Friedrichs and Lax-Wendroff method. The numerical results are confronted with the experiment. During the experiment simulation the method considers speed of sound in liquid like a function o

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Spence, R. "CFD Analyses of Centrifugal Pumps with Emphasis on Factors Affecting Internal Pressure Pulsations." Thesis, Cranfield University, 2006. http://dspace.lib.cranfield.ac.uk/handle/1826/7598.

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The operation of centrifugal pumps can generate instabilities and pressure pulsations that may be detrimental to the integrity and performance of the pump. Until recently these pressure pulsations could only be determined experimentally which resulted in a limited understanding of pressure pulsations around the pump. Industrial pump guarantees are limited to pulsation levels measured at the discharge. However, numerical analysis techniques have advanced to such a stage that they can now be used to explore these effects. The multi-block, structured grid CFD code TASCflow was used to investigate

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Okeng'o, Geoffrey Onchong’a. "A theoretical study of stellart pulsations in young brown dwarfs." Thesis, University of the Western Cape, 2011. http://hdl.handle.net/11394/2567.

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Magister Scientiae - Msc<br>This thesis reports the results of a twofold study on the recently proposed phenomenon of ‘stellar pulsations’ in young brown dwarfs by the seminal study of Palla and Baraffe (2005) (PB05, thereafter). The PB05 study presents results of a non-adiabatic linear stability analysis showing that young brown dwarfs should become pulsationally unstable during the deuterium burning phase of their evolution.<br>South Africa

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Schoemacker, Florian, Felix Fischer, and Katharina Schmitz. "Damping strategies for energy efficient pressure controllers of variable displacement pumps." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71108.

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In hydraulic-mechanically controlled variable displacement pumps, the actual pump controller produces additional power losses. Due to the low damping coefficients of all pump controller’s components, hydraulic-mechanically pressure controlled pumps use to oscillate while adjusting the pressure level in the hydraulic system. In several state-of-the-art variable pump controllers, a damping orifice connects the control actuator’s displacement chamber with the reservoir. This bypass dampens the movement of the control actuator but also leads to bypass losses during steady-state operation of the pu

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9

Ozdemir, Sahika. "Design Considerations And Performance Evaluation Of A Surge Tank For Diaphragm Pump Operation." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612662/index.pdf.

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This thesis is performed to evaluate the design consideration and performance characteristics of a surge tank for a diaphragm pump operation and to evaluate the proper volume and inlet area of surge tank in order to reduce the pulsations of the discharge pressure. An experimental set up is constructed for a three diaphragm positive displacement pump and the experiments are conducted afterwards. The surge tanks having different volumes and the surge tank inlet area configurations are tested in order to achieve the minimum peak to peak pulsations. Experiments showed that among the different size

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10

Joy, Jesline. "Mitigation of Pressure Pulsations in Francis Turbine Draft Tube with a GuideVane System : A Numerical Investigation." Licentiate thesis, Luleå tekniska universitet, Strömningslära och experimentell mekanik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83990.

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The use of renewable energy such as water and wind to produce electricity has been proven extremely effective in Sweden. The ability of these renewable resources to produce clean output energy counters the adversities caused by non-renewable resources. The use of hydraulic turbines is a good example of favoured technique for energy and power production using renewable resources. The hydro-turbines are designed to operate at best efficiency point (BEP). Varying energy demands in recent years implies on the need of flexible operation of hydraulic turbines. The issue of pressure pulsations in the

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11

Yeung, Ngai. "Viscous-damping walls for controlling wind-induced vibrations in buildings." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2324205X.

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12

揚毅 and Ngai Yeung. "Viscous-damping walls for controlling wind-induced vibrations in buildings." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31242637.

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13

Persson, Tova, and Frida Nylund. "Development of aphotopletysmography based methodfor investigating changes in bloodvolume pulsations : for the purpose of pressure ulcer prevention." Thesis, Linköpings universitet, Institutionen för medicinsk teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-138053.

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The aim of this thesis is to develop and evaluate a prototype for measuring volumetric changes of the blood with PPG. The prototype consist of a sensor plate controlled in Lab-view and algorithms for signal processing and analysis of results developed in Matlab. A study divided into three parts is performed, where the collected data is used for further development and alternations of the prototype between the study parts. A measurement in the study is divided into three stages before, during and after pressure, where the subject is changing body position between each stage in order to either a

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Sanna, Francesco. "Interaction between Flow Induced Pulsations and Multiphase Flows in Gas Liquid Systems." Thesis, Le Mans, 2016. http://www.theses.fr/2016LEMA1008/document.

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Le couplage entre un écoulement instable et des résonances acoustiques dans des systèmes de conduites peut conduire à des phénomènes d’oscillations auto-induites. Ce type de phénomènes trouve principalement place dans des conduites latérales fermées, par exemple dans des systèmes de transport ou de compression de gaz. L’objectif de ce travail est d’étudier les oscillations auto-induites dans le cas où le fluide transporté ne se limite pas à un gaz, mais est un mélange de gaz et de liquide. Les pulsations sont mesurées dans des conduites latérales fermées, pour deux types de configurations (en

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15

Yang, Menggeng. "Modelling and analysis of pressure pulsations in hydraulic components and systems with particular reference to pump fault diagnosis." Thesis, University of Bath, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503386.

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16

Hagborg, Martin. "Tryckpulsgenerering för funktionskalibrering av mätsystem." Thesis, Linköping University, Department of Science and Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1719.

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<p>The running of gas turbines with low emissions causes high pressure pulsations to arise in the combustion chamber. These pulsations are high amplitude sound vibrations. At some frequencies these are harmful to the gas turbine. Hence these pulsations are monitored to avoid operating conditions where pulsations are specifically harmful. It is necessary to expose the system of known pulsations to verify the functionality of the monitoring process. </p><p>This report describes the development of a generator of pressure pulsations to verify the monitoring system. The output should be of harmonic

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Gunasekaran, Barani. "Development and validation of a pressure based CFD methodology for acoustic wave propagation and damping." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8740.

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Combustion instabilities (thermo-acoustic pressure oscillations) have been recognised for some time as a problem limiting the development of low emissions (e.g., lean burn) gas turbine combustion systems, particularly for aviation propulsion applications. Recently, significant research efforts have been focused on acoustic damping for suppression of combustion instability. Most of this work has either been experimental or based on linear acoustic theory. The last 3-5 years has seen application of density based CFD methods to this problem, but no attempts to use pressure-based CFD methods which

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Čapoš, Eduard. "Šíření tlakových pulsací v pružných plastových hadicích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416454.

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This thesis deals with propagation of pressure and flow pulsations, which are strongly affected by the tube flexibility. There are two mathematic models introduced, which are derived from basic physical relations. First model assumes velocity only in the axis direction. Second one assumes also non-zero radial velocity. Kelvin-Voigt model for viscoelasticity was used. Furthermore, experimental measurement was designed and evaluated. Measured data was used to calculate material properties. In addition, dynamic transfer was determined.

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Xu, Y. L. (You Lin) 1952. "Vibration control of wind-excited tall/slender structures." Phd thesis, School of Civil and Mining Engineering, 1991. http://hdl.handle.net/2123/9458.

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20

Naik, Pratin J., Ganesh K. Seeniraj, and Ram S. Chandran. "A study into forces and moments acting on the swash plate of an axial piston pump using a novel approach to reduce pressure and flow pulsations." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71105.

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In hydraulic pumps, typically in axial piston pumps, reduction of pressure and flow ripples was attempted by providing relief grooves and pre-compression for noise reduction. Pre-compression is normally achieved by using the dead space between pump ports in the valve plate. Also valve plate profile modification is required, if system operating conditions such as pump output pressure and flowrate change, to maintain optimum operating conditions for reduced pressure/flow ripple. An earlier simulation study confirmed effectiveness of varying dead centre position to reduce pressure and flow ripple

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Sprowl, Tony Brandon. "A study of the effects of inlet preswirl on the dynamic coefficients of a straight-bore honeycomb gas damper seal." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1617.

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In high-pressure centrifugal compressors, honeycomb seals are often used as replacements for labyrinth seals to enhance dynamic stability. A concern exists with the loss of this enhanced stability if the honeycomb cavities become clogged with debris over time. So, as a first objective, static and dynamic tests were conducted on a constant-clearance honeycomb and a constant-clearance smooth-bore seal under three inlet preswirl conditions to determine the effects of inlet preswirl. The resulting leakage flowrate and dynamic parameters, effective stiffness and damping of the seal, were measured f

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Cochain, Jérémy. "Numerical and experimental study of misaligned and wavy mechanical face seals operating under pressure pulses and pressure inversions." Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2271/document.

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Les garnitures mécaniques sont utilisées dans de multiples applications pour réaliser l'étanchéité autour d'arbres en rotation. Ces composants peuvent fonctionner efficacement pendant plusieurs années en conditions stables, mais leur durée de vie est significativement réduite lorsque les conditions varient. L'objectif de ce travail de recherche est de développer et d’utiliser un banc d'essais et code de calcul pour étudier l'impact de pulsations de pression, d’inversions de pression et du chargement dynamique résultant sur les performances de garnitures mécaniques ayant des faces mésalignées e

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23

Šuráň, David. "Vliv nastavitelných vestaveb v savce turbiny na charakteristiku a tlakové pulzace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444634.

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This master’s thesis deals with the draft tube and its optimization for various operating conditions. The research investigates the theoretical description and function of the draft tube and explains known methods of suppressing pressure pulsation so far. In the computational part, the author proposes a new method and designs optimal geometry of adjustable installations (ribs) for the draft tube. Finally, the comparison with the default geometry without ribs is performed.

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Lacarelle, Arnaud [Verfasser], and C. O. [Akademischer Betreuer] Paschereit. "Modeling, control, and optimization of fuel/air mixing in a lean premixed swirl combustor using fuel staging to reduce pressure pulsations and NOx emissions / Arnaud Lacarelle. Betreuer: C. O. Paschereit." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2011. http://d-nb.info/1017839778/34.

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Kozák, Jiří. "Vírový cop při nadoptimálním průtoku Francisovou turbínou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231007.

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This master's thesis deals with CFD simulation of vortex rope in the elbow draft tube for overload operation of Francis turbine. The main objective of the thesis is to compare results of the CFD simulations of the original elbow draft tube with a derived straight cone draft tube considering volume and the shape of the cavitation region and dynamic flow characteristic. Results of the 3D simulations are also compared with axi-symmetric simulations, which reduce demands for computing time and power.

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Hazucha, Jan. "Vliv otevření difuzoru na dynamické vlastnosti spirální vírové struktury." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401535.

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This master’s thesis deals with CFD simulation of spiral vortex structure in the diffuser of swirl generator. The objective of the thesis is to evaluate influence of change in diffuser opening angle on frequency and amplitude of pressure pulsation. All results are compared in charts which shows courses of frequencies and amplitudes along the diffuser. Two different turbulence models and several types of mesh were tested

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Štefan, David. "Study of the Dissipation in Spiraling Vortical Structures." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234456.

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This work deals with study of swirling flows where the spiral vortical structure appears. The main relation is to flow seen in the draft tube cone of hydraulic turbines operated out of the design point (i.e. best efficiency point). In this cases large coherent vortex structure (vortex rope) appears and consequently high pressure pulsations are propagated to the whole machine system leading to possible restriction of turbine operation. This flow features are consequence of flow instability called vortex breakdown in case of Francis turbine operated at part load (flow rate lower than optimal one

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Hall, Braydon Day. "The Dynamic Analysis of a Composite Overwrapped Gun Barrel with Constrained Viscoelastic Damping Layers Using the Modal Strain Energy Method." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1972.

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The effects of a composite overwrapped gun barrel with viscoelastic damping layers are investigated. Interlaminar stresses and constrained layer damping effects are described. The Modal Strain Energy method is developed for measuring the extent to which the barrel is damped. The equations of motion used in the finite element analysis are derived. The transient solution process is outlined. Decisions for selected parameters are discussed. The results of the finite element analyses are presented using the program written in FORTRAN. The static solution is solved with a constant internal pressure

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Hoa, Pham Trong, and Nguyen Manh Hung. "Numerical calculation of dynamic stiffness and damping coefficients of oil lubrication film in internal gear motors and pumps." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71107.

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Oil lubrication film plays an important role in analysis of dynamic behavior of the internal gear motors and pumps. During operation, the oil film is considered as the spring and damping system. Therefore, calculation of the dynamic stiffness and damping coefficients is necessary to build the mathematical model for studying of dynamic problem. In order to calculate these coefficients, the dynamic pressure and perturbing pressure distribution must be determined firstly. In this paper, the infinitesimal perturbation method (IFP) is used to calculate the dynamic pressure distribution. Based on th

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Слободян, В. І. "Раціоннальне використання енергетичних ресурсів компресорних станцій магістральних газопроводів". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2011. http://elar.nung.edu.ua/handle/123456789/1948.

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Дисертацію присвячено удосконаленню технологій експлуатації складних газотранспортних систем з багатоцеховими компресорними станціями з метою економії енерговитрат на транспортування газу і використання прихованих резервів виробничого процесу. Досліджено і проаналізовано квазістаціонарні режими роботи складних ГТС, в результаті встановлено необхідність регулювання режимів з метою зменшення енерговитрат, та виявлено пульсаційні процеси коливання тису на вході КС, досліджено вплив пульсацій тиску на втомну міцність технологічних трубопроводів КС. Проведено дослідження втрат енергії в умовах техн

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Vacula, Jiří. "Axiální síla a tlakové pulsace v čerpadle s dvoustranným vstupem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230191.

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This diploma thesis deals with axial thrust existence in a double suction pump rotor. Axial thrust appears especially in low flow rates modes. The aim of this work is finding information about this issue and deriving mathematical model of calculation which will be subsequently applied on experimental data received from double suction pump measurement in laboratory. It is important to examine the whole dynamics of axial thrust development and find its cause of formation in measured double suction pump.

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Vrána, Jiří. "Využití dynamického tlumiče v hydrodynamice." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401519.

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The master thesis deals with the possibility of using dynamic damper in hydrodynamics. Specifically, the assessment of the impact of dynamic damper on the dynamic stability of the fluid system when the system exhibited unstable behaviour prior to damper installation due to self-excited vibration. In the thesis is presented the algorithm for the calculation of pressure and flow pulsations based on the transfer matrix method, the transition matrices for different damper designs variants are derived. Using the algorithm, the effect of a damper placed in a stable and unstable fluid system is solve

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Jacquet, Clément. "Investigation par Calcul numérique de la région en « S » des courbes caractéristiques d’une turbine-pompe réversible." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI055.

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Les Stations de Transfert de l’Énergie par Pompage (STEP) munies de turbines-pompes réversibles de type Francis (TP) permettent de stocker et de restituer de grandes quantités d’énergie avec des rendements très élevés. Celles-ci apparaissent comme un moyen viable d’assurer la réactivité et la stabilité du réseau électrique vis-à-vis de l’augmentation croissante des sources d’énergie renouvelables intermittentes. Pour répondre aux nouveaux besoins en régulation du réseau électrique, la technologie actuelle des STEP doit être adaptée. Accroître la réactivité requiert d’optimiser les procédures d

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Khaled, Abdul Rahim Assaad Mr. "Non-isothermal characterization of squeezed thin films in the presence of biofluids and suspended ultrafine particles." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1071085983.

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Kapusta, Juraj. "Diagnostika stroje založena na modelech." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442841.

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The main idea is focused on the diagnostics of a specific hydraulic system, i.e. sensing the physical quantities of the hydraulic circuit with a tank and a centrifugal pump driven by an asynchronous motor. It is a system of pipes connected to the pump, where due to its work it creates a water flow and a pressure increase. In practice, this issue is also addressed in the energy and nuclear industries. Primary circuits in some cases cannot be designed or modified to be able measure locally the pressure value. It is necessary to measure this quantity indirectly - from the motor currents. The main

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Onodera, Andrea Naomi. "Influência das características mecânicas da entressola e da estrutura do cabedal de calçados esportivos na percepção do conforto e na biomecânica da corrida." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/5/5170/tde-04112016-114124/.

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o presente estudo teve por objetivo investigar a influência de duas diferentes resiliências de materiais de amortecimento e de dois tipos de cabedais de calçados esportivos na cinemática e cinética de membro inferior e na percepção do conforto durante a corrida. Também investigamos as possíveis relações entre o conforto percebido e as variáveis biomecânicas capturadas. Para tal, foram avaliados 42 corredores recreacionais adultos, com no mínimo de um ano de experiência em corrida de rua, com mínimo de dois treinos regulares por semana, e com volume de treino semanal superior a 5 km. Fora

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Závorka, Dalibor. "Využití akustické emise při sledování hydraulických strojů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318403.

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The goal of this diploma thesis is to clarify possibilities of usage of acoustic emission as a hydraulic machinery diagnostics tool. Especially for exposing presence of ruptures or cracks in the parts of machine, assuming changes in acoustic exposure of the part during operation. This clarification is based on series of simple measured experiments, which consist of monitoring the bolt placed in fluid stream inside of a pipe. This bolt was preloaded against inner wall of pipe by appropriate tightening torque. This preload is supposed to simulate effects of the size of rupture. High preload simu

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Cummins, Colin Reuben. "Behavior of a Full-Scale Pile Cap with Loosely and Densely Compacted Clean Sand Backfill under Cyclic and Dynamic Loadings." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1684.

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A series of lateral load tests were performed on a full-scale pile cap with three different backfill conditions, namely: with no backfill present, with densely compacted clean sand in place, and with loosely compacted clean sand in place. In addition to being displaced under a static loading, the pile cap was subjected to low frequency, small displacement loading cycles from load actuators and higher frequency, small displacement, dynamic loading cycles from an eccentric mass shaker. The passive earth pressure from the backfill was found to significantly increase the load capacity of the pile

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39

Hrazdíra, Zdeněk. "Vzájemná interakce tlakových pulsací a kmitání nepřímé trubice." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382190.

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This thesis deals with mathematical modeling of multiphysics FSI (fluid-structure interaction) problem, describing mutual interaction of pressure pulsations and vibrations of indirect pipe in a 2D region. Firstly, physical partial differential equations are derived separately for both media, which are in turn coupled and solved analytically. Results of mentioned models include natural frequency values, amplitude-frequency characteristics and both natural and driven damped oscillations of pipe and liquid.

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Marsh, Robert Ashall. "Passive Earth Pressures on a Pile Cap with a Dense Sand Backfill." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1958.

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Pile groups are often used to provide support for structures. Capping a pile group further adds to the system's resistance due to the passive earth pressure from surrounding backfill. While ultimate passive earth pressure under static loading conditions can be readily calculated using several different theories, the effects of cyclic and dynamic loading on the passive earth pressure response are less understood. Data derived from the full-scale testing of a pile cap system with a densely compacted sand backfill under static, cyclic, and dynamic loadings was analyzed with particular focus on so

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41

Svedberg, Anna. "Improvement of the retention-fromation relationship using three-component retention aid systems." Doctoral thesis, KTH, Fiberteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96259.

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42

Pavelka, František. "Využití Fluentu při výpočtech nestacionárního proudění v rozsáhlých sítích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318136.

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The main objective of this Master´s thesis is the appropriate calculation proposal of pressure and discharge conditions in extensive ducts in unsteady flow. The calculation proposal was aimed at the conenction of two commercial programmes. Exacly the programme Ansis Fluent and Matlab, which deals with the connection of onedimensional (1D) calculation in Matlab and multidimensional (2D) calculation in Ansys Fluent programme. This Mastr’s thesis also deals with creation of the independent 1D model (Matlab, method of characteristic) and independent 2D model flow (Ansys Fluent, Inviscid model).

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43

Ulke-Winter, Lars. "Naturanaloge Optimierungsverfahren zur Auslegung von Faserverbundstrukturen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-220529.

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Die vollständige Ausnutzung des Leichtbaupotentials bei der Dimensionierung von mehrschichtigen endlosfaserverstärkten Strukturbauteilen erfordert die Bereitstellung von geeigneten Optimierungswerkzeugen, da bei der Auslegung eine große Anzahl von Entwurfsvariablen zu berücksichtigen sind. In dieser Arbeit werden Optimierungsalgorithmen und -strategien zur Lösung wissenschaftlicher Fragestellungen für industrielle Anwendungen bei der Konstruktion von entsprechenden Faserkunststoffverbunden entwickelt und bewertet. Um das breite Anwendungsspektrum aufzuzeigen, werden drei unterschiedliche reprä

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Le, Xuan Minh Philippe. "Contribution a l'etude des problemes mecaniques et thermiques engendres par la circulation fluide dans un amortisseur." Paris 6, 1987. http://www.theses.fr/1987PA066183.

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Etude d'un amortisseur hydraulique de suspension automobile. Calcul de l'amortissement et des pertes de charge. Influence du piston et du clapet. L'ecoulement au niveau du clapet est assimile a un ecoulement radial visqueux. On etudie la loi de deformation du clapet (flexion d'un disque mince)

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Григорський, С. Я. "Удосконалення технології експлуатації нафтопроводів з урахуванням нештатних ситуацій". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2015. http://elar.nung.edu.ua/handle/123456789/4726.

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За результатами теоретичних та експериментальних досліджень вирішена наукова задача підвищення ефективності та надійності експлуатації магістральних нафтопроводів шляхом мінімізації негативного впливу нештатних ситуацій. Проведено експериментальні дослідження гідродинаміки перехідних процесів, спричинених зупинками насосних агрегатів на нафтоперекачувальних станціях (НПС) нафтопроводу. Встановлені закономірності зміни обертової частоти вала насосних агрегатів типу НМ у часі в процесі їх зупинки. Визначена фактична швидкість розповсюдження хвилі тиску нафтопроводом під час перехідного процесу.

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Macháček, Ondřej. "Magnetorheological Strut for Vibration Isolation System of Space Launcher." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-391819.

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Práce se zabývá návrhem magnetoreologické (MR) vzpěry vibroizolačního systému (VIS) pro kosmický nosič. V rešeršní části jsou popsány vybrané VIS a vzpěry těchto systémů, které byly v kosmických nosičích využity v minulosti. Každá z těchto vzpěr obsahující kapalinu byla těsněna pomocí statických těsnění a pružných vlnovců vyrobených z oceli. Důkladněji byla analyzována vzpěra pasivního systému VIS s označením ELVIS, jehož konstrukce se stala inspirací pro tuto práci. Jedná se o tříparametrický systém, v němž je tlumič uložen na pružině, jejíž tuhost přibližně odpovídá objemové tuhosti vlnovců

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47

Täschner, Dirk. "Untersuchungen der akustischen Wirkung von Tragrollen zur zielgerichteten Lärmminderung an Gurtförderanlagen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2017. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-220185.

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Gurtförderanlagen werden im Bergbau und anderen Industriezweigen zum Transport von Schüttgütern eingesetzt. Der Anlagenbetrieb ist mit Geräuschemissionen verbunden. Dies kann bei Kontrolle und Wartung eine erhöhte Lärmbelastung für betroffene Mitarbeiter hervorrufen. Im Umfeld von Wohnbebauungen oder schutzbedürftigen Objekten kann die Überschreitung von Immissionsrichtwerten zu einer zeitlichen Betriebseinschränkung der hocheffizienten Anlagen führen. Zur Lärmminderung an der Quelle oder deren Nähe erfordert dies technische Schallschutzmaßnahmen. Die Tragrollen im Obertrum der Gurtförderanlag

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48

Kowalczyk, Piotr Jozef. "Validation and application of advanced soil constitutive models in numerical modelling of soil and soil-structure interaction under seismic loading." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/275675.

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This thesis presents validation and application of advanced soil constitutive models in cases of seismic loading conditions. Firstly, results of three advanced soil constitutive models are compared with examples of shear stack experimental data for free field response in dry sand for shear and compression wave propagation. Higher harmonic generation in acceleration records, observed in experimental works, is shown to be possibly the result of soil nonlinearity and fast elastic unloading waves. This finding is shown to have high importance on structural response, real earthquake records and r

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Kowalczyk, Piotr Jozef. "Validation and application of advanced soil constitutive models in numerical modelling of soil and soil-structure interaction under seismic loading." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/275675.

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This thesis presents validation and application of advanced soil constitutive models in cases of seismic loading conditions. Firstly, results of three advanced soil constitutive models are compared with examples of shear stack experimental data for free field response in dry sand for shear and compression wave propagation. Higher harmonic generation in acceleration records, observed in experimental works, is shown to be possibly the result of soil nonlinearity and fast elastic unloading waves. This finding is shown to have high importance on structural response, real earthquake records and re

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50

Ulke-Winter, Lars. "Naturanaloge Optimierungsverfahren zur Auslegung von Faserverbundstrukturen." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2016. https://monarch.qucosa.de/id/qucosa%3A20662.

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Die vollständige Ausnutzung des Leichtbaupotentials bei der Dimensionierung von mehrschichtigen endlosfaserverstärkten Strukturbauteilen erfordert die Bereitstellung von geeigneten Optimierungswerkzeugen, da bei der Auslegung eine große Anzahl von Entwurfsvariablen zu berücksichtigen sind. In dieser Arbeit werden Optimierungsalgorithmen und -strategien zur Lösung wissenschaftlicher Fragestellungen für industrielle Anwendungen bei der Konstruktion von entsprechenden Faserkunststoffverbunden entwickelt und bewertet. Um das breite Anwendungsspektrum aufzuzeigen, werden drei unterschiedliche reprä

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