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1
Foltýn, Jan. „Konstrukce hydrostatického uložení divadelní točny“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444275.
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This thesis deals with the issue of hydrostatic bearings. The aim was to design a test rig for an axial hydrostatic bearing. The axial hydrostatic bearing was calculated and designed with respect to the function of the tester. The construction of the test equipment was further supported by calculations of the main parts together with FEM analyses. The design was also accompanied by an introduction to the hydraulic parts of the hydrostatic bearing, which took place in consultation with Bosch Rexroth. The aim of the work, the design of a test device in a scale of 1:10, was completed. The following results from hydrostatic bearing tests will allow the introduction of new procedures in the production of turntables mounted on a hydrostatic bearing. Examination of operating conditions and permissible assembly inaccuracies will make it possible to reduce the production requirements for bearing mounting.
2
Wong, Anthony Raymond. „Design of a low cost hydrostatic bearing“. Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74951.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 77).
This thesis presents the design and manufacturing method for a new surface self compensating hydrostatic bearing. A lumped resistance model was used to analyze the performance of the bearing and provide guidance on laying out the bearing features. One arrangement of bearing features was cut into a flat sheet of ultra high molecular weight polyethylene which was then formed into a cylindrical shape. The shaped plastic was adhered to an aluminum housing then connected to a pump. Experimental data shows that the lumped resistance model provides a good estimation of the bearing performance. After validating the analytical model, sensitivity studies were conducted to predict changes in the bearing performance due to manufacturing variances. The results of the model indicate the design is extremely robust.
by Anthony Raymond Wong.
S.M.
3
Ashman, D. „High-speed performance of a hydrostatic thrust bearing“. Thesis, University of Wolverhampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378961.
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The programme of research reported in this dissertation was undertaken with the aim of improving the high-speed performance of a multi-recessed hydrostatic thrust bearing. A theoretical analysis of the quasi-static behaviour and isothermal frictional power consumption is developed using the basic equations governing viscous fluid flow. The effects of high peripheral speeds are discussed and how recently proposed bearing modifications, in the form of grooved lands and changes in recess geometry, are used to reduce the frictional power consumption, lower operating temperatures, and reduce unwanted hydrodynamic and fluid inertia induced pressure variations. The steady state temperature distribution, frictional power consumption and operating clearance when one bearing member is rotating, and dynamic loading performance are predicted by several specially developed Fortran computer programs. One section concentrates on the design, development and instrumentation of an experimental multi-recessed hydrostatic thrust bearing, which had a facility for changing the pocket geometry using recess inserts. The bearing plate. which had an outside diameter of 200 mm, was operated at rotational speeds between 1000-5000 rpm to give peripheral speeds between 10.5 - 52.5 m/s. A chapter deals with an experimental investigation of the high-speed performance of a multi-recessed hydrostatic thrust bearing, principally the quasi-static loading and flow rate characteristics, temperature and pressure distributions and frictional power consumption. Furthermore, the dynamic response of the test bearing arrangement was investigated experimentally for a range of excitation frequencies between 0- 70 Hz- Finally, the theoretical predictions of characteristics such as quasi-static loading and flow rate, steady state operating conditions and dynamic response are compared with the corresponding experimental results.
4
Mass, Igor, Andreas Hoppermann und Hubertus Murrenhoff. „Control concept for a grease lubricated hydrostatic bearing“. Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71086.
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In industrial practice greases are mainly used as lubricants in hydrodynamic plain bearings and roller bearings. The use in hydrostatic bearings is avoided due to the difficult controllability. One reason is the complex non-Newtonian flow behavior of greases. The motivation for this paper is the use of greases to increase the efficiency of hydrostatic bearings. The assumption is that the so-called yield stress of consistent greases can lead to self-sealing behavior in the bearing under stationary operation conditions. Assuming a volume-flow-free operation of the bearing, a concept for the active control of the sealing gap height and thus the bearing stiffness was developed. The concept idea is the use of a second medium with Newtonian characteristic for pressure transfer. The grease and the pressure control fluid are structurally separated. The grease is induced in the shortest possible way into the bearing pocket to keep the pressure losses as low as possible. The results of test bench investigations indicate the feasibility of a gap height control with very high bearing stiffness under use of highly consistent greases and initiate further investigation on non-stationary operation.
5
Rothenhöfer, Gerald S. (Gerald Sven). „Design, dynamic modeling, simulation and feedback control of hydrostatic bearing“. Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39888.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.Includes bibliographical references (p. 113).
A hydrostatic bearing carriage (Hydrocline) that uses an open face linear motor to drive the carriage as well as to preload the hydrostatic bearings has been developed by Professor Alexander Slocum and Gerald Rothenhöfer of the Massachusetts Institute of Technology's Mechanical Engineering Department. The Hydrocline is made to cope with the increasing requirements for accuracy in silicon wafer grinding machines. The prototype was built of aluminum oxide ceramic due to its high stiffness-to-weight ratio, low thermal expansion and corrosion resistance. In order to keep the cost of manufacturing as low as possible, a modular design that uses micron-level precision ceramic beams was chosen. Initial testing of the prototype carriage indicates that it has the following performance specifications: a vertical load capacity exceeding 5000N (theoretical limit at 12000N, max. pressure of pumps); a carriage pitch error of 0.7arc seconds; a yaw error of 0.7arc seconds; a roll error of +/- 0.6arcsec a vertical straightness at the center of the carriage of +/-0.75microns; and a vertical stiffness of the carriage of 900N per micron (load range from 0 to 1000N).
(cont.) A dynamic model of the hydrostatic bearing and fluid supply system has been developed and accurately predicts the performance of the Hydrocline. The model has been used to simulate a feedback control loop that adjusts the bearing supply flow such that changes in load can be compensated and theoretically infinite stiffness can be reached. In first experiments on a specially designed test setup the measured static stiffness of the single pocket test bearing could be increased by a factor 8 (load range 45 to 270N). The dynamic stiffness of the bearing could be increased by a factor of 2.5.
by Gerald S. Rothenhöfer.
S.M.
6
Zulkefli, Zamir Aimaduddin Bin. „MITIGATION OF GEAR MESH-FREQUENCY VIBRATIONS UTILIZING A HYDROSTATIC BEARING“. Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1354902949.
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7
Sawicki, Jerezy Teodor. „Experimental and theoretical determination of hydrostatic/hybrid journal bearing rotordynamic coefficients“. Case Western Reserve University School of Graduate Studies / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1056560686.
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8
Almond, R. J. „The development of a porous ceramic water hydrostatic bearing for ultra high precision applications“. Thesis, Cranfield University, 1999. http://dspace.lib.cranfield.ac.uk/handle/1826/10572.
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The
principal objective of this research was to produce a
series of extremely stiff and thermally stable porous
ceramic bearings, and to expand the performance envelope of
fluid film technology beyond that currently achievable with
conventional oil hydrostatic bearings. The driving force
for these developments came from recent advances in ultra-
precision and high speed machining, which have placed
severe demands on the accuracy and performance of spindle
and
guide-way bearing systems.
A critical part of this research was to develop a material
processing methodology, which enabled porous ceramic
bearing structures to be manufactured with consistent
permeability coefficients. Such control of the material
microstructure was necessary in order to produce a useful
and predetermined level of performance. The bearings were
fabricated using bimodal blends of alumina powder, and
vibratory packing into graphite tooling was used to achieve
uniform green densities. Following this, the tooling was
transferred directly to a hot isostatic press for capsule
free high pressure sintering. The influence of temperature
and pressure on sintering and permeability was studied, and
optimum processing conditions were established.
The operation of the water lubricated porous hydrostatic
bearing was investigated on a highly instrumented journal
test rig. This research has resulted in a bearing with
greater stiffness, higher operating speed and lower power
consumption than conventional oil hydrostatic technology
could achieve. Significant savings were also shown
regarding the energy required to drive the spindle
assembly, with a reduction in both rotating frictional
power and lubricant pumping power consumption.
9
Mertz, David Hunter. „Lift-off performance in flexure pivot pad and hybrid bearings“. [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3197.
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10
Kim, Paul Y. „A new method for the critical speed calculation of rotor-bearing systems“. Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5135.
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11
Anderson, Colin George. „First assessment of the magnetic-hydrostatic main bearing proposed for the duck wave-energy converter“. Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/13318.
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12
Horvat, Frank Eugene. „Experimental and Numerical Analysis of Flow and Pressure Fields Inside a Variable Depth Single Pocket Hydrostatic Bearing“. University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1217254306.
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13
Saito, Hayate. „Development of Silyl Groups Bearing Bulky Alkoxy Unit and Their Application to Organic Synthesis“. Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263488.
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14
Fang, Yuefa. „Calculation and measurement of the eight oil film stiffness and damping coefficients for a variable impedance hydrodynamic bearing“. Thesis, Staffordshire University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359621.
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15
Záviška, Petr. „Návrh otočného stolu CES 200 s hydrostatickým uložením“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230143.
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This diploma deals is occupied with design of the heavy rotary table with hydrostatic bearing of table. In introductory part of deals the design part are described, for exampel. tipes of bearings, drive and etc. In other parts the design of rotary table with hydrostatic bearings is described.
16
Červenec, Adam. „Parní turbína pro pohon kompresoru“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401526.
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The purpose of the diploma thesis is the design of condensing steam turbine for driving a compressor with mechanical power of 14,5 MW and operating speed 6800 rotations per minute on the compressor clutch. The main part is the thermodynamic calculation of the blade canal, which is verified with strength calculation to meet the requirements of the standart API 612. The next part is a basic design of gland sealing system, including a piston which is leveling the axial force with reusage of steam back to the blade canal. This thesis includes a calculation of axial and radial forces including the choice of suitable bearing, which both support the turbine. In the end there is an operating characteristics and function reliability of rising rotating speed on the total stress of blades.
17
Miller, Adam Charles. „Assessment of Alternate Viscoelastic Contact Models for a Bearing Interface between an Axial Piston Pump Swash Plate and Housing“. The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1403274866.
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18
Křížek, Stanislav. „Projekt centralizace výroby mosazných klecí pro valivá ložiska“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229080.
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This diploma thesis deals with a project to centralize the production of brass cage bearings in the company ZKL Hanušovice, a.s. The first part is focused on the description of the current production process, which has many disadvatages. From the analysis of these disadvantages we can make suggestions for making the production process more effective. The second part of the thesis focuses on these suggestions for the cetralized production proccess. The best of these suggestions has been elaborated into a technological project including capacity calculation and technical drawings. The final part of the thesis provils a technical-economic evaluation of the project, focusing mainly on the efficiency of investment in new production equipment and its impact on company management.
19
Chen, Dongju. „Analysis and identification technology of system errors of large vertical ultra-precision machine tool“. Compiègne, 2010. http://www.theses.fr/2010COMP1890.
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Dans plusieurs pays, les technologies d'usinage d'ultra-précision apportent une contribution importante au développement des sciences et des hautes technologies, principalement dans les domaines de l'optique, des microsystèmes et des ordinateurs avec des applications dans l'industrie des semi-conducteurs, du stockage de données, de l'aéronautique et de l'espace. L'usinage d'ultra-précision est entré dans le domaine de la nano-échelle et devient une dé nécessaire au développement des hautes technologies tant civiles que militaires. L'objectif de la recherche était de développer des méthodes de modélisation des axes mobiles d'une machine-outil d'ultra-précision, afin de prédire et identifier les erreurs de la machine et sa précision d'usinage. L'analyse des erreurs a été effectuée par la théorie multi-corps, la méthode des matrices de transfert et la méthode des éléments finis. La broche verticale sur paliers hydrostatiques a été modélisée. La raideur des paliers a été déduite des calculs de la portance par éléments finis et par une approximation analytique, en très bon accord. Le modèle mathématique de l'équilibre statique de la broche a permis d'évaluer la raideur sur tous les degrés de liberté, conduisant à la relation entre l'angle d'erreur de battement et le chargement. Les vibrations forcées de la broche générées par un défaut d'équilibrage pendant l'usinage ont été calculés par un modèle dynamique, dont on peut déduire la raideur dynamique et la réponse en fréquence. Un modèle thermomécanique de la broche intégrée à la machine a été établi, avec estimation des sources et des transferts de chaleur : l’influence des mécanismes de transfert sur l'erreur thermique a été analysée et l'impact sur la précision de la machine a été déduit. Un modèle d'erreur couplée des axes la machine sur guidages à paliers aérostatiques a été établi par la théorie multi-corps. La distribution de pression du film de gaz alimenté par une double rangée d'orifices a été obtenue par la théorie de la lubrification pour la structure complexe composée de guidages verticaux associés à des chariots d'équilibrage. Le modèle dynamique couplé du système de glissière a été établi et la réponse dynamique des guidages en fonction de la hauteur du film d'air a été déduite. Finalement, une méthode d’identification de l'erreur de mouvement de la machine à partir de la mesure d'une pièce usinée a été développée. Les mesures de la surface de la pièce usinée ont été traitées par transformation en ondelettes. L'erreur de rotation de la broche a été modélisée par une fonction de Weierstrass du temps. La corrélation entre les mesures géométriques des guidages, du système de broche et de la pièce permet d'en déduire l'influence de chaque source d'erreur sur la précision d'usinage. En combinant les analyses par ondelettes et densité spectrale, on peut également identifier les différentes erreurs dynamiques de la machine dans le domaine fréquentiel et la relation entre les ondulations de petite amplitude présentes dans la morphologie de la surface sur la précision de la machineUltra-precision machining technology is an important supporting technology of modern high-technology warfare, which is the development foundation for hightech industries and science and technology, and is the development direction of modern manufacturing science. The semiconductor device supported by ultraprecision machining technology, laid the foundation for the development of electronics and information industry. The development of modern science and technology based on the test, almost all of the test equipment needs the support of ultra-precision machining technology. Now ultra-precision machining has entered the nano-scale, and become an indispensable key means of developing high-tech. Whether the military industry, or civilian industry, all need such advanced machining technology. The research on machining precision of a two-axis large ultra-precision machine tool, analyzing the errors of main components of machine tool by multibody theory, the transfer matrix method, and finite element method. In order to show the comprehensive characterization of workpiece, wavelet method, correlation analysis and power spectral density method are used to analyze the surface topography of workpiece, different from the traditional Fourier transfer method, wavelet method express the comprehensive characterization of the signal in time and frequency domain. Correlation analysis method can estimate the signal in two different processes. Power spectral density method can fully reflect the impact of small-scale waviness of surface morphology on the machined accuracy. For the hydrostatic bearings, the parameters equation of bearings was deduced by the knowledge of fluid mechanics, and the calculated results were compared with other calculations. The mathematical model of spindle system in equilibrium was established according to Newton’s law, based on the the model, the relationship between derivation angle and stiffness of bearing was deduced, and the stiffness in all directions are given. The forced vibration of spindle caused by unbalance during machining process was researched through dynamic model of spindle. Dynamic stiffness and frequency response were deduced according to the axial static stiffness of spindle. Thermal-mechanical model of spindle system was established, the calculation basis of the heat transfer in the spindle system was deuced, and thermal error was analyzed with heat transfer mechanism, the variation of bearing performance at the different conditions under the influence of thermal errors, and the impact on the machining accuracy was analyzed. The coupling error model of guidewaies of machine tool was established with multi-body system theory. For the complex structure of guideway and unloading slide, the pressure distribution of gas film of guideway with double row orifices by gas lubrication theory, and corresponding load capacity and gas stiffness was obtained. The movement frequency with gas film thickness of entire slide system during machining process was showed. The coupling dynamic model of motion and unloading slides was established through corresponding frequency, the dynamic response of slide with the variation of gas film thickness was deduced. Finally, the variation of moving frequency in the whole gas film thickness was obtained. Finally, the measured result of workpiece was processed by wavelet transfer. The rotation error model of spindle was proposed by Weierstrass function, and the correctness and feasibility of this model was verified by comparing with actual test results. The correlation between guideway, spindle system and measured result of workpiece was analyzed, thus the degree of influence of every error on the machining accuracy was deduced. Combained with wavelet method and power spectral density method, the errors of guideway and spindle systems was analyzed in frequency domain, the characteristics of vibration signal of machine tool in frequency domain was extracted, and various error that affect the machining accuracy were identified according to the spectral characteristics
20
Paurá, Edson Nunes Costa. „Estudo de Primeiros Princípios de Peapods de Carbono sob Pressão Hidrostática“. Universidade Federal do Maranhão, 2010. http://tedebc.ufma.br:8080/jspui/handle/tede/719.
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Previous issue date: 2010-03-10In this work the structural and energetic properties of C60@(17,0) carbon peapods bundle were studied under hydrostatic pressure. To study such properties we use ab initio quantum calculations based on the density functional theory in the approach of the generalized gradient approximation. All simulations were performed using the SIESTA code. The results indicate that the bundles in the study present two phase transitions, the first transitions occurring in range 2.0 GPa - 3.0 GPa and the second occurring around 15.0 GPa, in good agreement with the literature. The analysis of electronics properties through energy bands indicates that the ( it Peapods) from P < 3.0 GPa are semiconductor with visible reduction in the energy gap, while above 3.0 GPa the systems become metallic. Also the energy levels of the band are changed according to the hydrostatic pressure is being applied, such as breaking the degeneracy of the levels of valence bands and conduction bands. To each interval of pressure applied we also calculated the relative volume percentual and cohesive energy as a function of pressure.
Neste trabalho foram estudadas as propriedades estruturais, energéticas e eletrônicas de bundles de peapods de carbono C60@(17,0) submetidos à variação de pressão hidrostática. Para estudar tais propriedades, utilizamos cálculos quânticos de primeiros princípios baseados na teoria do funcional da densidade com a aproximação do gradiente generalizado. Todas as simulações foram realizadas com a utilização do código SIESTA. Os resultados encontrados indicam que os bundles em estudo sofrem duas transiçõesde fase, a primeira ocorrendo no intervalo de pressão 2,0 - 3,0 GPa e a segunda ocorrendo entre 15 - 20.0 GPa, em perfeito acordo com a literatura.A análise das propriedades eletrônicas via estrutura de bandas de energia, indica que os peapods para P < 3,0 GPa são semicondutor com visível diminuição do gap de energia, enquanto que acima de 3,0 GPa os sistemas passam a ser metálico. Também os níveis de energia da banda são alterados conforme a pressão hidrostática está sendo aplicada, como por exemplo, a quebra na degenerecencia dos níveis das bandas de valência e condução. Para cada intervalo de pressão aplicada calculamos o percentual do volume relativo e a energia coesiva do sistema.
21
Coutinho, Samir Silva. „Estudo de Primeiros Princípios de Bundles de Nanotubos de Nitreto de Boro sob Pressão Hidrostática“. Universidade Federal do Maranhão, 2007. http://tedebc.ufma.br:8080/jspui/handle/tede/731.
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Previous issue date: 2007-08-21In this work were studied the electronic, vibrations and structural properties of boron nitride nanotube bundles (16,0), (12,0) and (8,0), when submitted to the hydrostatic pressure changes. To study such properties, we used the ab initio method employing density functional theory in the approach of the generalized gradient approximation. All the simulations were performed using of the siesta code. The obtained results showed that the circular cross section of each one of the studied bundles undergoes a deformation (elliptic) when applied pressure reaches the value of P > 1,0 GPa for the bundle (16,0), P > 2,0 GPa for the bundle (12,0) and for values greater then 6,5 GPa for the bundle (8,0). For each pressure interval it was calculated the percent relative volume, cohesive energy, modes of vibrations and the band structures. The analysis of the electronic properties, through the band structures, indicates that the characteristics semiconducting of boron nitride nanotubes is preserved during the pressure increasing.
Neste trabalho foram estudadas as propriedades eletrõnicas, vibracionais e estruturais de bundles de nanotubos de nitreto de boro (16,0), (12,0) e (8,0) submetidos à variação de pressão hidrostástica. Para estudar tais propriedades, utilizamos o método ab initio com uso da teoria do funcional da densidade na aproximação do gradiente generalizado. Todas simulações foram realizadas com a utilização do código siesta. Com os resultados encontrados foi observado que a seção transversal circular de cada um dos bundles estudados sofre uma deformação (elíptica) quando a pressão aplicada atinge o valor de P > 1,0 GPa para o bundles (16,0), P > 2,0 GPa para o bundles (12,0) e P > 6,5 GPa para os bundles (8,0). Para cada intervalo de pressão aplicada calculamos o percentual do volume relativo, energia coesiva, modos vibracionais e a estrutura de bandas. A análise das propriedades eletrônicas, através da estrutura de bandas, indica que as características semicondutoras dos nanotubos de nitreto de boro são preservadas durante o aumento da pressão.
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Buchta, Vojtěch. „Ocelový skelet průmyslového objektu“. Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371858.
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The diploma thesis deal with design of a technological building in Ostrava serving for the sorting of slag to enagle its sequential use. Geometry of the structure was customized to technological requests. Static system was considered in two versions – joint connections with vertical bracing and omni-directional frame. For detail processing was chosen the joint one, besause it showed up as more advantageous. Static calculation was performed by Scia Engineer 14 software, then some typical connections and drawings were manually designed.
23
Paroulek, Adam. „Ocelový skelet technologického objektu“. Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409841.
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The diploma thesis deals with the design of a steel technological structure in the locality of Štětí. The struture is used for the paper production technology. The geometry of the structure was customized to technological requests. The statistic system was considered in two versions – joint connections and frame – joint connections. The frame – joint connections system was chosen for detail processing. The steel structure was calculated by Scia Engineer 19 software. The connections were calculated by Idea statica software. The thesis is processed according to valid standars of ČSN EN.
24
Tailony, Rauf. „Internal Combustion Engine Cold Test Driveline Modeling, Analysis and Development“. University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1564765172535669.
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25
Kráčmar, Tomáš. „Konstrukce vřeten vícevřetenového soustružnického automatu“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241713.
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This master‘s thesis contains a design of multi-spindle automatic lathe spindles for the work of the rods maximum diameter of 7 mm. The work deals with a new concept of the drive spindle, where the spindles are driven by external asynchronous motor through the gears with internal teeth attached to the outside of the spindle drum instead of the current method of driven by central coaxial shaft. The thesis research of multi-spindle lathes including a description of the main nodes, design, strength calculations, bearing durability and a simulation model for simulation acceleration and load drives and spindles from the cutting process.
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Pavelka, Radomil. „Pohon vřeten pětivřetenového soustružnického automatu“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231522.
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The subject of the thesis is design of independent spindle drive for multi-spindle automatic lathe MORI-SAY TMZ 520 CNC manufactured by TAJMAC-ZPS. The thesis will introduce the representatives of manufacturing program of TAJMAC-ZPS multi-spindle automatic lathes division and there will be a brief description of their main constructional parts. The main objective of the thesis is an engineering design of testing device which will be bulit for verification of the correct drive concept. There is also many calculations and detailed description of the engineering design. The testing device is made for internal needs of TAJMAC-ZPS.
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Kabrhelová, Eliška. „Nosná konstrukce rodinného domu“. Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265267.
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Master's thesis is focused on the design and assessment of load-bearing structure of the family house. Model reinforced concrete structure is created in RFEM. Elements of reinforced concrete are Assessed in accordance with EN 1992-1-1. Excepting static calculation is part of documentation the technical report and drawings shape and reinforcement.
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Lečbych, Antonín. „Trojlodní objekt pro průmyslovou výrobu“. Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227558.
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The thesis contains the design and assessment of three-aisled steel building for small metal production. Supporting span of construction hall is 9, 18 and 9 m. In the middle wing is situated bridge crane with capacity of 2 tons. The estimated location of the object is Luhačovice. The initial design concept was specified by supervisor (as the idea of the investor/architect), for which was did static and structural solution and assembly details. For selected option was made a calculation of supporting structures and selected assembly details. The hall has a rectangular floor plan of 36x36m and ridge height is 9 m. The central wing is made of steel and side extensions are made of glued laminated timber.
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Bašista, Ján. „Zastřešení objektu pro společenské účely“. Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226074.
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The work treats the static recalculation of an existing roof structure of a construction for social purposes and proposes two variants of the design of a new roof structure. The construction has a rectangular ground plan of 30 m x 47 m and the roof structure is placed on the load bearing circumference concrete walls. Except for the load constituted by the function of the construction and by the climatic area, an extra load of 2 tons suspended at any place of the structure is considered because of the special requirement of working and technological equipment. The variant no. 1 is designed from the steel S355. The variant no. 2 is designed as a combination of the wood GL24h and the aluminium EN-AW 5083. Both of the variants have 11 transverse load bearing girders. The purlins are perpendicular to the girders and are placed on them. Stiffness is secured by roof stiffeners.
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Kondáš, Ondřej. „Polyfunkční dům Brno, Černovice - stavebně technologický projekt“. Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265233.
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The aim of this master's thesis is the construction-technological project of the entire building focusing on major construction building - Multifunctional house, which is based on large-diameter piles. The main part of thesis are budget of object and time schedules of construction. Part of the thesis is organization of construction and design of the site eguipment, technological regulation of selected work, quality control and solving transport relations including oversize cargo. It also deals with the design of mechanical assemblies, health and safety, safety of environment and design of instructions for use of building.
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Chen, Chung Chin, und 陳宗慶. „A Hydrostatic Rotary Bearing Design“. Thesis, 2014. http://ndltd.ncl.edu.tw/handle/fanqxh.
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Yeh, Chih-Jung, und 葉志榮. „Stress Analyses of Hydrostatic Thrust Bearing“. Thesis, 1998. http://ndltd.ncl.edu.tw/handle/01478854585184121344.
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碩士國立成功大學
機械工程學系
86
Hydrostatic bearings are most important in manufacturing of heavy machine. In general, the push powers of turbo compressor, twyer and water marine engine are loaded by hydrostatic thrust bearings. Rolling bearings and hydrostatic bearings are usually used to support the center axial and the rotation flange. Additionally, in machine tool, especial in large planing machine, hydrostatic bearings are also applied for lubrication and support. Although the hydrostatic bearing is frictionless, and can minimize the wear of frictional momentum and frictional power at lower rolling speed. However, the heavy load of bearing will cause the relative displacement of the bearing with respect to the center of support; when the displacement of the bearing becomes large, the film thickness of the bearing will be different from others. This situation can result in non-uniform load of bearings, which will yield acute damage. To avoid rising grave effect of machines, MSC/ARIES is used to analyze the normal stress of bearings, and MARC is used to analyze the contact problems of bearings.
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Lin, Sheng Guan, und 林昇冠. „Precision Shaft Position Control of Hydrostatic Bearing“. Thesis, 2016. http://ndltd.ncl.edu.tw/handle/56932660012301003826.
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Tsai, ChiPing, und 蔡其平. „Characteristics Analysis of Hydrostatic Bearing with capillary Restrictions“. Thesis, 2012. http://ndltd.ncl.edu.tw/handle/57920654539967014972.
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碩士東南科技大學
機械工程研究所
100
This study is primarily focusing on the influences of hydrostatic radial bearing on load capacity and static stiffness with different parameters, including number of recess, restriction, recess length ratio, and displacement ratio in capillary restriction. We constructed the flow continuity equations for each recess using Flow Resistance Network (FRN) method, solved the set of equations for pressure ratios, and then further obtained the load capacities and static stiffness. The FRN method establishes the flow rates and interactions within themselves in a multi-recess system based on energy equations. The rates are proportional to the pressure difference between two recesses, but inversely proportional to the flow resistance. The simulation results indicate that the hydrostatic radial bearing of capillary compensator has better performance with increase in the numbers of recess and decrease in recess length ratio. The stiffness is optimized with smaller restriction parameters under heavy load capacity. Moreover, while the number of recess is fixed and displacement ratio is greater than 0.3, the stiffness reaches its optimum with smaller recess length ratio and appropriate restriction parameters.
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Chen, Wei-chih, und 陳威志. „Research of the Properties for Hydrostatic Thrust Bearing“. Thesis, 2012. http://ndltd.ncl.edu.tw/handle/46433911844880646961.
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碩士國立雲林科技大學
機械工程系碩士班
100
The present thesis examines the influence of experimental parameters of the hydrostatic thrust bearing on properties thereof. Through the mathematical formulas derived from Navier-Stokes equations and Reynolds equation the relationship between various parameters (such as pressure, flow, gap and load) were investigated. Meanwhile, the parameters were set using the hydrostatic thrust bearing test platform with pre-restricted membrane-type restrictor, and data regarding parameters were measured via a sensor linked to the platform The tables for measured data were constructed. Lastly, the measured experimental data and the calculated theoretical values were used to make a correlation chart and analyzed setting the parameters which were in a small gap of the oil film would exert hydrostatic thrust bearing properties of high load-supporting.
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Liu, Chun-Yu, und 劉醇宇. „Manufacture and Validation of Porous Tile Hydrostatic Bearing“. Thesis, 2018. http://ndltd.ncl.edu.tw/handle/e4svmn.
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Lin, You Xiang, und 林祐祥. „A Horizontal Hydrostatic Rotary Bearing Design and Analysis“. Thesis, 2016. http://ndltd.ncl.edu.tw/handle/13734066137889765603.
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碩士國立清華大學
動力機械工程學系
104
This thesis studies the design process of the hydrostatic bearing, and completes a horizontal hydrostatic rotary bearing design with high performance based on a properly structural design and with self-made capillary restrictors. In theory, analyze the flow resistance of the pad and restrictors to design the pressure ratio between the source and the pocket, which conduces to design the bearing stiffness. Secondly, this study probes the function of the load capacity of the single pad and the opposed pad hydrostatic bearing, and the performance of stiffness. In addition, this work also searches the relevant literature about the computation of the stiffness and the load capacity to obtain the essential parameter which influences the bearing’s characteristics, such as the oil film thickness, the land dimension, the oil viscosity, the total flow. This work will compare and analyze the experimental results and the functions about different literatures to estimate the performance of the bearing accurately. This thesis uses the existing horizontal hydrostatic bearing to do the experiment and analyze before the design contracts out. These experimental results compare the actual performance with the theoretic performance to make discussion about the probable parameter of error and present a method to improve the performance of the horizontal hydrostatic rotary bearing. Key words: horizontal hydrostatic rotary bearing, restrictor, stiffness
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詹勳浩. „Development of a feed drive mechanism with hydrostatic bearing“. Thesis, 2003. http://ndltd.ncl.edu.tw/handle/63952937675683578481.
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碩士國立臺北科技大學
製造科技研究所
91
The purpose of this study is to develop and assess the accuracy and performance of a feed drive mechanism designed with high helix ball screw and hydrostatic air bearing, and then to investigate the optimum design parameters of such system. The procedures of study include the following: the design parameters of air bearing are calculated based on basic formula, prototype is designed and built, various types of precision instrument are used to test the accuracy and performance of the system. Finally, the testing data are analyzed and the important design considerations are generalized. For the measurement and test, laser interferometer is used to measure the positioning accuracy and repeatability of the stage under different types of operating conditions. Static stiffness and dynamic characteristic are also performed. Thorough analysis and comparison between design and testing data are analyzed to yield the important design parameters. It is believed that the research results can be a good reference for this type of problem.
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Hu, Sheng-Yen, und 胡聖彥. „Characteristics Analysis of Constant-flow Valve for Hydrostatic Bearing“. Thesis, 2012. http://ndltd.ncl.edu.tw/handle/90621275749942677586.
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碩士中原大學
機械工程研究所
100
Constant-flow valves have been presented in industrial applications or academic studies, which compensate pressures of bearing recesses as load fluctuates. The flow rate of constant-flow valves can be constant in spite of the pressure changes in recesses. However, specific condition of design parameters must be satisfied. This paper utilizes analytical method to study the static and dynamic characteristics of constant-flow valves, three types of constant-flow valve are DDE-type, DSI-type, and spool-type. The static analysis gives the specific relationships among design parameters for constant flow. The dynamic analysis gives the variations around the constant flow rate as the working pressure fluctuates.
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Jian, Jia-Yu, und 簡嘉昱. „The Stiffness Analysis of Hydrostatic Bearing By Taguchi Method“. Thesis, 2012. http://ndltd.ncl.edu.tw/handle/97257969472685715973.
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碩士國立雲林科技大學
機械工程系碩士班
100
The purpose of the research is to study the stiffness of hydrostatic bearing. Therefore, construct a hydrostatic bearing test platform to explore the affection of the hydrostatic bearing stiffness in different gap, different pressure, and different flow. Through the theoretical discussion to analyze the stiffness of hydrostatic bearing on the machine, use Taguchi method to find the best combination of parameters on stiffness of hydrostatic bearing. By this research, we can obtain the stiffness analytic methodology of hydrostatic bearing to improve machine precision. It is helpful to have the key technology in high-precision machine tools that will make our industrial to keep up with other countries in the world.
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Tseng, Chin-Sheng, und 曾進生. „The study of hydrostatic journal bearing lubricated with ferrofluid“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/sss32r.
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碩士中華大學
機械工程學系碩士在職專班
101
This thesis studies the characteristics of hydrostatic bearings lubricating with ferrofluid. The multi-pocket capillary compensated bearings has been studied to simulate lubricant film and to determine the influences of magnetic field, magnetic fluid, couple stress parameters, restrictor and geometry and physical parameters of bearing on the static and dynamic performances and stability of a rotor-bearing system. The modified Reynolds equation is developed by using Stoke couple stress fluid theory as well as Jenkins model. The Reynolds equation is split into the zero-th and first order equations by the method of perturbation. A finite difference method is introduced to solve the zero-th equation for the static pressure and the first order equations for the dynamic pressure distributions of the hydrostatic journal bearing. Static analyses determine the static pressure distribution, load capacity, flow rate and friction coefficient, and dynamic analyses determine the stiffness and damping coefficients. In advance, stability maps of a rotor-bearing system are determined by Routh-Hurwitz method.
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Chen, Yi-Yun, und 陳翊云. „Design and Test of Hydrostatic Bearing with Floating Ring“. Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5w3kh5.
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43
Hsu, Chi Rou, und 許芷柔. „Comparison of Multi-Objective Optimization Methods for Hydrostatic Bearing Designs“. Thesis, 2014. http://ndltd.ncl.edu.tw/handle/13863047125788642896.
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碩士長庚大學
機械工程學系
102
There are many engineering designs have two or more design objectives, which require some special optimization method to obtain the best design parameters to satisfy the objectives simultaneously. These methods are different from the more commonly applied single-objective optimization methods. In this study, three approaches which can solve the multi-objective optimization problems（MOOPs）are presented and compared. The comparison is based on the effectiveness and search efficiency of a method. The design problem is centered on a hydrostatic bearing with four design variables. The goals are to maximize the bearing stiffness of the bearing as well as to minimize the amount of the supply air mass flow. The computer model consists of two computing platforms, a MATLAB code for real-time monitoring and a Fortran program for computationally intensive bearing performance computation. The optimization algorithm is handled by the MATLAB programming, which is trivial in terms of overall computing loading. Particle swarm optimization (PSO) method is combined with the Pareto criterion to solve the two-objective porous air bearing design problem. Three approaches（MOPSO1-3）in selecting the global best design in the PSO are presented. The results are compared with a published study using the genetic algorithm（GA）for solving the same bearing problem. It is shown that the three methods presented in thos study perform better than the multi-objective GA. While the MOPSO3 has the best result due to the method can preserve the current best point with possible improvement in each search step.
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Jhang, Sie-Sing, und 張協興. „Study in Flow Control for Constant Film of Hydrostatic Bearing“. Thesis, 2017. http://ndltd.ncl.edu.tw/handle/a864h7.
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碩士中原大學
機械工程研究所
105
Hydrostatic bearings are used in tool spindle, working head, linear guides, lead screw, rotary table slideway, worm-gear and worm-rack, where the spindle or worktable is supported by the external pressurized lubricant film. As a hydrostatic bearing which provides greater load capacity, higher stiffness and vibration damping than rolling bearings and air bearings, and has lower friction coefficient, greater accuracy and longer life than the hard guides, its rotation accuracy is better than hydrodynamic bearings and zero torque starting capacity. However, there are still innate advantages of hydrostatic bearings did not been developed. Basically, the hydrostatic bearings have the same drawbacks as the hard guides, rolling bearings, hydrodynamic bearings and air bearings, including decreases in the film thickness and stiffness with increased load, and non-uniform load causes the worktable or spindle tilt, and the lubricant viscosity varies with temperature change make the lubricant flow change and further more cause the film thickness changed, and the reaction for resisting to dynamic loads is too slow decreasing the accuracy. Therefore, this project proposes to establish the identification methods, calibration methods and control method to keep constant film thickness for hydrostatic bearing systems and level of worktable. The design of hydrostatic bearing system will be applying the analytical methods to establish bearing geometry, restrictor type and geometry and the physical parameters of the hydrostatic bearing system by according to the required bearing characteristics. But there are some differences between the actual bearing characteristic parameters after manufactured and assembled and the design features. In this paper, hydrostatic bearing oil film thickness does not change and the whole oil film uniform as the goal, to discuss the control of the displacement pump speed control to solve the film thickness uneven and the thickness of the load with the variable to the closed bearing work platform four Point of the displacement and eight oil sills pressure, flow, motor speed as a feedback signal, and the establishment of hydrostatic bearing control method, according to the design of the overall control loop to keep the work table stability. In this paper, the LabView software is used to establish the human-machine interface of sensing and control, to calculate the feedback and control the flow, to achieve equal thickness control.
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Chen, Wen-Chou, und 陳玟州. „An Investigation in Damping Ratio Scales of Hydrostatic Bearing Film“. Thesis, 2018. http://ndltd.ncl.edu.tw/handle/332qc7.
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碩士中原大學
機械工程研究所
106
This project uses numerical analysis methods and experimental verification to study the dynamic characteristics of worktable supported by hydrostatic bearing. An investigation in the influence of worktable flexibility, bearing geometry, restriction parameter, design parameter of pressure compensations, and control, parameters such as viscosity and flow rate on dynamic stiffness and damping ratio will be obtained. The method in this study is to establish the oil film damping ratio scale by the harmonic excitation vibration theory, which is used for dynamic design analysis of the bearing with worktable. The analysis results provide an improvement scheme for increasing the dynamic stiffness and damping of hydrostatic bearing. This project will verify and calibrate the analysis method and results by experiment and identification.
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LI, YUN-RUEI, und 李昀叡. „Development of Spool-type Pressure Feedback Restrictor for Hydrostatic Bearing“. Thesis, 2016. http://ndltd.ncl.edu.tw/handle/34319201295649926751.
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碩士國立雲林科技大學
機械工程系
104
Due to the increasing demands of larger dimension, heavy load and higher precision for current and future machine tools, the development of hydrostatic bearing has become an important issue over the past few years. In this study, therefore, a novel single-acting spool-type pressure feedback restrictor for hydrostatic bearing is developed. Nowadays, the most commonly used pressure feedback restrictor for hydrostatic bearing is membrane type of restrictor, in which a thin and flexible metal sheet serves as the key component control to the hydraulic oil flow precisely. However, the membrane type pressure feedback restrictor is not quite suitable for extremely heavy load. Therefore, an alternative to design the pressure feedback restrictor for hydrostatic bearing using spool type is presented in this study. It is expected and finally proved that the developed spool-type pressure feedback restrictor can support much heavier load than the membrane type of restrictor. There are two significant features regarding the novel design. The first feature is the introduced orifice restrictor which avoids effectively the influence of possible oil temperature variation. The second feature is the design of two adjustable hand wheels that are built into the valve body to widen the application range. Finally, the experimental results prove that the new design of spool-type pressure feedback restrictor with the hydrostatic bearing can successfully make the thickless of oil-film vary a little when it’s loaded.
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黃美慈. „Analysis and experiment of the membrane restrictors for the hydrostatic bearing“. Thesis, 2012. http://ndltd.ncl.edu.tw/handle/84954030002993544362.
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碩士國立彰化師範大學
機電工程學系
100
This purpose of this thesis is to discusses the part of the hydrostatic bearing membrane restrictor. The hydrostatic bearing pressure changes as the load changes in the gap between the axis pad. Pressure changes within the membrane restrictor will produce deformation to membrane film, so that the membrane gap and oil fluid resistance caused by changes. And affect the flow of lubricating fluid, which can compensate for load changes. Firstly, using the finite element method analyzed the membrane diaphragm deformation of membrane restrictor. Then using finite difference method analyzed axis pad characteristic in hydrostatic system .Secondary, simulate results of the membrane diaphragm deformation compared with the experiment results. Finally, using the accurate membrane diaphragm deformation modified the hydrostatic axis pad simulate program to know the related characteristic of axis pad with membrane restrictors. The result can be used in the design and development in the similar hydrostatic system.
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Pan, Jun-Yan, und 潘俊諺. „Design and Analysis of the Membrane Restrictors on the Hydrostatic Bearing“. Thesis, 2014. http://ndltd.ncl.edu.tw/handle/16290475445401610423.
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碩士國立彰化師範大學
工業教育與技術學系
102
Hydrostatic guides or bearings are very important crucial components in precision mechanical system. The recess pad clearance is changed by external loading and generate the pressure difference caused by deformed of membrane in the hydrostatic system. It makes the feedback status that the restriction gap changed and influence fluid resistance and the flow in the membrane restrictors. Therefore, the purpose of this study is to analyze and examine the membrane restrictors characterizing of the hydrostatic bearing. The first step in this project is to design the membrane restrictors by the criterion of the hydrostatic system. Secondly, using COMSOL performed fluid-structure interaction analysis of the diaphragm that will be obtained pressure and stress field distribution and deformation of the diaphragm in membrane restrictors. Then obtained fluid resistance and other related properties of the membrane restrictors, and explore the impact of associated parameters include oil pressure, restriction gap, diaphragm thickness, types of oil to membrane restrictors performance of feedback. Finally, the simulation results and the experimental measurements were compared to verify the feasibility. The experiments verify that between simulation analysis and experimental measurement despite errors, but has the same trend.
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Hung, Yu-Hong, und 洪宇宏. „Characteristics Analysis of Hydrostatic Closed-type Bearing Using Double-action Compensations“. Thesis, 2010. http://ndltd.ncl.edu.tw/handle/87v2q3.
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碩士中原大學
機械工程研究所
98
This thesis of a serial studies for studying constant and variable compensations of the closed-type hydrostatic flat bearing. In this part, the double-action variable restrictors including cylindrical-spool, conical-spool and membrane types and self-compensation are taken into consideration. Analysis of the recess pressure versus displacement ratio of worktable and load capacity and static stiffness. Characteristics of hydrostatic closed-type bearing using double-action compensations. The static stiffness of will be also determined by the same method as shown in previous parts. Consequently, the usage range of recess pressure and optimal parameters of appropriate compensation type can be obtained according to the smallest gradient of displacement or maximum stiffness.
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Li, Yi-Chi, und 李翊綺. „A Study on Tolerance Distribution and Analysis of a Hydrostatic Bearing“. Thesis, 2016. http://ndltd.ncl.edu.tw/handle/05274133317394249110.
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碩士國立中興大學
機械工程學系所
104
Hydrostatic bearings systems are widely applied on situation which needs high precision and high stiffness. The performance of a hydrostatic bearing can be predicted by the structure character. But something is as important as structure character, which is the assembly tolerance. If the assembly tolerance is more than design, the product may become useless. As a result, combing the function of hydrostatic bearing and tolerance design is the main purpose of this article. Defining specific tolerance by the goal that designer set to the hydrostatic bearings. With this, assembly of tolerance can be calculated. If it is more than the goal, or less than the goal we can adjust it by tolerance adjusting method.