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Auswahl der wissenschaftlichen Literatur zum Thema „CALCULATION OF BASIC PARAMETERS OF HYDRAULIC MOTOR“
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Zeitschriftenartikel zum Thema "CALCULATION OF BASIC PARAMETERS OF HYDRAULIC MOTOR"
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Shargorodskiy, Serhiy, und Volodymyr Rutkevych. „INFLUENCE OF PHYSICAL AND MECHANICAL PROPERTIES OF STEM FEED AND DESIGN OF THE WORKING BODY ON THE DRIVE POWER OF THE CUTTING MECHANISM“. ENGINEERING, ENERGY, TRANSPORT AIC, Nr. 2(113) (29.06.2021): 38–49. http://dx.doi.org/10.37128/2520-6168-2021-2-5.
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The paper considers the problem of reducing the drive power of the mechanism for separating stalk feed from trench storages by the batch method by developing and substantiating the parameters and operating modes of the hydraulic drive system. The structure and principle of construction of a system of hydraulic drives of the mechanism for separating a portion of stem feed are proposed. This will significantly reduce the power of the used hydraulic motors by simultaneously controlling the cutting speed of the monolith of stem feed and the feed of the cutting device. The analysis of changes in the physical and mechanical properties of stalk forage (silage and haylage), depending on the height of occurrence in the trench storage, has been carried out. The process of separation of the stalk feed from the feed monolith is considered. The complexity of the technological process of separating the portion of the stalk feed from the feed monolith due to the change in the physical and mechanical properties of the feed from the height in the trench storage and the lack of adaptation of the loader drive to such differences is indicated. A basic hydraulic diagram of the loader drives is proposed, which is based on the dependence of the cutting force of the material on the parameters of cutting modes. The theoretical foundations of the calculation were formulated by I. Timme and later adapted to the peculiarities of the work of agricultural machinery by V.P. Garyachkin. This theory allows you to determine the cutting force on the working body of the cutter bar depending on the cutting speed, feed of the cutter bar and depth of cut. An adaptive hydraulic drive of the mechanism for separating the stalk feed is proposed, which makes it possible to coordinate the operation of the cutter bar drive with its supply. The possibility of reducing the drive power of the mechanism for separating the stalk feed to 5-6 kW when using a system of hydraulic drives with a mechanism for adapting the working bodies to their working conditions has been confirmed. The modes of operation and the possibilities of increasing energy efficiency, competitiveness of technological machines and aggregates of the agro-industrial complex, by developing and substantiating the parameters of the hydraulic drive system, are indicated.
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Nikolaiev, V. A. „Lower drive of continuous action unit to form underlying layer of road“. Russian Automobile and Highway Industry Journal 18, Nr. 1 (30.03.2021): 30–41. http://dx.doi.org/10.26518/2071-7296-2021-18-1-30-41.
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Introduction. A continuous action unit for the formation of an underlying layer is designed to increase productivity in the construction of roads and other facilities, for which it is necessary to remove the top layer of soil. In the bucket of the continuous action unit to form an underlying layer of roads provides the use of working bodies, cutting the ground with blades of knives. The cut-off soil enters the buckets. The forces attached to the bucket are considered. Theoretically reasonable total energy costs for ground cutting of one cubic meter by buckets of continuous action unit to form an underlying layer of roads requires 109 kilojoules. Based on the calculations carried out, it is possible to determine the torque, the power required for the lower drive, the transmission ratio from the hydraulic motor to the stars, to develop the design of many elements of the continuous action unit to form the underlying layer of the road.The method of research. To determine the torque, the power required for the lower drive, the transmission ratio from the hydraulic motor to the asterisks, to the projection of the bucket on the horizontal plane attached all forces are applied directed along the bucket. As a result of their addition, the total maximum traction force of moving all the boilers during their filling with soil was revealed. On the basis of this, the method of calculating the parameters of the required is given. There is a danger of the ground being poured out of the bucket when it is rotated on the leading stars of the lower drive. To check the parameters received, the bucket is rotated by 90 degrees on the leading stars of the lower drive. The forces acting on the ground, located in the bucket, at the moment of the beginning of the turn of the bucket were revealed. A system of equations has been created, on the basis of which the condition of inadmissibility of the dumping of soil from the bucket at its turn on the leading stars has been established.Results. As a result of the addition of forces directed in the course of the bucket, the total maximum traction force of moving all the boilers during their filling with the ground, traction force on the right chain and left chain is defined. Traction chains are chosen by destructive load. The torque of the lower drive, the angular speed of the drive stars, the power required for the lower drive, the transmission ratio from the hydraulic motor to the asterisk are calculated. Based on the transferable power, a gerotor motor is chosen for the lower drive of the unit. On the basis of the calculations the design of chains, support rink, chain suspension have been developed.Conclusion. Based on the calculations made, the maximum traction force of all the buckets during the period when they are filled with soil is 11,870 newtons, the torque of the lower drive is 2,362 newtonometers, the speed of the chains is 1,686 meters per second, the angular velocity of the drive stars is 8,47 radians per second, power required for lower drive is 20 kilowatts. Based on the transferable power, it is advisable to use MT-160 gerotor motor and a single-stage planetary gearbox with a transmission ratio from the hydraulic motor to the stars 7,674. The calculations made it possible to develop the design of many elements of the continuous action unit to form an underlying layer of roads.
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Luo, Zhi Bin. „Calculation of Interaction Force between Pipe and Water of HVAC“. Advanced Materials Research 1046 (Oktober 2014): 165–68. http://dx.doi.org/10.4028/www.scientific.net/amr.1046.165.
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On the basis of the pipe network hydraulic calculation of basic theory, the pipe network utilization, using graph theory and peak array build relationships and storage node and pipe sections between the pipeline node associated with the hydraulic parameters of pipe sections linked together establish a common heating pipe network hydraulic calculation models. Matrix for the model were derived solving ideas based on the finite element method and linearization method for existing node equation method to improve to get a new heating network hydraulic calculation methods common to construct a new iterative calculation equation, to improve the convergence of iterative calculation.
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Zhao, Zhong Hao, Zeng Liang Li und Sheng Nan Lu. „The Principle and Calculation of Hydraulic Driven Downhole Twin-Screw Pump“. Advanced Materials Research 201-203 (Februar 2011): 448–53. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.448.
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Structure composition and working principle of hydraulic driven downhole twin-screw pump are firstly introduced, and the calculation method of work and structure parameters when downhole twin-screw pump and turbine motor operate is given, and dynamic measuring process when ground power pump, turbine motor and downhole twin-screw pump coordinate is also given. The given calculation process which is derived after sufficiently considering working principle and structure features of the pump, is instructive to the design of this kind of downhole twin-screw pump, and also provides technical support for series design of hydraulic driven downhole twin-screw pump in the future.
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Jonkobilov, Ulugmurad, Sobir Jonkobilov, Ulugbek Rajabov, Toshburi Egamnazarov und Shuhrat Xo’shiyev. „Analytical substantiation of the parameters of the directional air-hydraulic hood“. E3S Web of Conferences 264 (2021): 03034. http://dx.doi.org/10.1051/e3sconf/202126403034.
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The article is about to the calculation of the main technical parameters of the directional air-hydraulic hood. It is accepted as a mathematical model of wave equations of hyperbolic type as applied to pressure pipelines of pumping stations, and analytical solutions of wave equations for different values of the polytropic exponents are proposed. Water hammer poses a danger to the normal operation of the main equipment of stations, control and measuring equipment, control devices and pressure pipelines. To damp the intensity of water hammer in the pressure pipelines of pumping stations, we have accepted an effective design of an air-hydraulic cap. When establishing the strength indicators of pressure pipelines against hydraulic shock, it is necessary to make an accurate calculation of the main parameters of the proposed design of the air - hydraulic cap. The article presents the results of analytical and experimental studies of the accepted cap design. At the same time, an analytical method is proposed for calculating the basic dimensions of the cap. The results of the proposed calculation procedure are in good corresponding with the experimental data. This confirms the reliability of the proposed analytical calculation method.
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Hou, Jiaoyi, Hongyu Sun, Aoyu Xu, Yongjun Gong und Dayong Ning. „Fault diagnosis of synchronous hydraulic motor based on acoustic signals“. Advances in Mechanical Engineering 12, Nr. 4 (April 2020): 168781402091610. http://dx.doi.org/10.1177/1687814020916107.
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Synchronous hydraulic motors are used in high load conditions. Therefore, the failure of such motors must be promptly detected to avoid severe accidents and economic loss. The automation of signal processing and diagnostic processes in practical engineering applications can help improve engineering efficiency and reduce hazards. As a non-contact acquisition signal, an acoustic signal has easier acquisition than a vibration signal. This article proposes an automatic fault detection method for synchronous hydraulic motors, which uses acoustic signals. The proposed method includes the automatic calculation and pattern recognition of the parameters of fault feature vectors. The automatic calculation of the fault feature vector is based on the combination of wavelet packet energy and the Pearson correlation coefficient. Then, the nearest-neighbor classifier is used for fault diagnosis. This study verifies that the proposed method can effectively identify the normal state, gear wear, gear rust, and barrier block wear. This method provides a solution for the automatic fault diagnosis of synchronous hydraulic motors and other types of quasi-period rotating machinery.
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Blashchuk, M. Yu, Anton A. Kazantsev und R. V. Chernukhin. „Capacity Calculation of Hydraulic Motors in Geokhod Systems for Justification of Energy-Power Block Parameters“. Applied Mechanics and Materials 682 (Oktober 2014): 418–25. http://dx.doi.org/10.4028/www.scientific.net/amm.682.418.
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The paper provides description of an approach to calculate main parameters of energy-power block of geokhod computing the hydraulic motor capacity of each end user. The paper determines the effect of geokhod dimensions on capacity consumption by main geokhod systems. The shares of capacity consumed in each geokhod system are calculated.
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Wu, Bao Gui, Shu Fa Yan und Shao Ping Li. „Hydraulic Excavator Working Device Simulation Based on Virtual Prototype“. Advanced Materials Research 1037 (Oktober 2014): 49–52. http://dx.doi.org/10.4028/www.scientific.net/amr.1037.49.
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In order to observe the kinematic characteristic and dynamic characteristic of working state of hydraulic excavator, and aim at the complexity and time consuming of the numerical calculation and field test, the hydraulic excavator working device motion simulation and analysis scheme is put forward. By kinematics simulation, the envelope trajectory of the manipulator and the basic working parameters are got; by dynamics simulation, the force of each hinge in symmetrical and offset loadings is got, and the most hazardous working condition and hinge are determined. Thus provided the basis for strength analysis and design optimization of hydraulic excavator working device. Accordingly, a simulation analysis method to study the dynamics of the working device in hydraulic excavator is provided.
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Hu, Kai, und Wenyi Zhang. „Design and simulation for driving system and steering system of hydraulic chassis of rice transplanter“. Advances in Mechanical Engineering 10, Nr. 10 (Oktober 2018): 168781401880890. http://dx.doi.org/10.1177/1687814018808901.
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A new hydraulic chassis of rice transplanter is designed based on the paddy machinery operation requirements. Driving system adopts single pump four-motor scheme, and the anti-slide valve group is used to prevent the slippage of the shunt-wound hydraulic motors. Hydraulic steering system adopts single-way stable diverter valve for ensuring its response in time. Then, hydraulic system and components parameters are designed and calculated. The driving resistance and average slip rate are measured in paddy field. The experimental data verifies the correctness of theoretical calculation. The designed hydraulic driving system and steering system are simulated in AMESim. The simulated data, including pressure, flow, and torque, basically conform to the design requirement. The results verify the feasibility and reliability of chassis hydraulic scheme. The proposed design scheme may be extended to other vehicles for improving chassis performance.
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Milecki, Andrzej, und Dominik Rybarczyk. „Modeling and Control of Proportional Valve with Synchronous Motor“. Solid State Phenomena 220-221 (Januar 2015): 457–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.457.
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The paper describes the research results of modeling and control of proportional valve with synchronous motor type PMSM (Permanent Magnets Synchronous Motor). In the paper, a simulation model of the proposed valve was developed and described. The model included the square root flow characteristics, nonlinearity of the hydraulic actuator, valve dead zone and saturation of the flow. The study included the investigations of the basic characteristics, such as valve flow characteristic and step responses. In order to determine the basic parameters of the valve, the test stand was built, on which the new valve and the servo drive with this valve were tested. A servo drive control system was based on PLC with touch panel and inverter module. In the paper, the chosen investigations results of the valve and the servo drive system are presented and shortly discussed.
Dissertationen zum Thema "CALCULATION OF BASIC PARAMETERS OF HYDRAULIC MOTOR"
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Maštera, Lukáš. „Koncepce vysokorychlostní vrtné hlavy pro odběr vzorků hornin“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443237.
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THE THESIS FOCUSES ON A CONSTRUCTION DESIGN OF A NEW DRILLING HEAD DESIGNED TO REPLACE THE ORIGINAL ONE IN A MULTIDRILL HYNDAGA DRILLING RING. THE SUBSTITUTION IS SUPPOSED TO PROVIDE A SOLUTION TO THE SHORTCOMINGS OF THE CURRENTLY USED DRILLING HEAD. THE THESIS ANALYSES PARAMETERS OBTAINED FROM THE MANUFACTURER, NEW PRODUCTION REQUIREMENTS AND PROPOSES TWO TYPES OF MOTORS INNOVATIVE METHODS HAD BEEN IMPLEMENTED IN CALCULATIONS OF CONCEPTUAL PARAMETERS OF THE NECESSARY COMPONENTS. THE OUTCOME IS A NEW F-TYPE DRILLING HEAD.
Konferenzberichte zum Thema "CALCULATION OF BASIC PARAMETERS OF HYDRAULIC MOTOR"
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Tsugawa, Takuji. „Case Study of Impeller Profile Considering Additional Parameters“. In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56059.
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In the previous paper, the optimum meridian profile of impeller was obtained for various specific speed by means of five shape factors. In this paper, the optimum meridian profile of impeller is obtained by means of eight shape factors. The basic five shape factors are inlet relative flow angle β1, turning angle Δβ, axial velocity ratio kc = Cm2/Cm1 impeller diameter ratio kd = D1c/D2c and outlet hub-tip ratio ν2 (β1 and Δβ are in mid span stream surface). The additional three parameters are three stream lines solidity (tip solidity σt, mid span solidity σc, and hub solidity σh). The blade length of impeller meridian profile is able to obtain by additional three parameters. The method of optimization is the calculation of hydraulic efficiency and suction specific speed in all combinations of eight shape parameters. The number of five shape factors are expressed by Nβ1, NΔβ, Nkc, Nkd, Nν2. The number of calculations is expressed by Nβ1 × NΔβ × Nkc × Nkd × Nν2. For example, Nβ1 = NΔβ = Nkc = Nkd = Nν2 = 40, the number of calculations is about 100000000. The calculation time is about 2 hours. The best parameters are selected in 100000000 cases. In case of eight shape factors, the number of calculation is Nβ1 × NΔβ × Nkc × Nkd × Nν2 × Nσt × Nσc × Nσh. Nβ1 = NΔβ = Nkc = Nkd = Nν2 = Nσt = Nσc = Nσh = 10, the number of calculation is 100000000. In this case, the calculation time of eight shape factors is as same as that of five shape factors. By means of this method, the more detailed optimum mixed flow impeller meridian shape is obtained. In case study, the best 1000 optimum meridian profiles and the best design parameter are selected for few kinds of specific speed using eight dimensional optimum method. In the previous paper, the mixed flow angle on tip meridian stream line isn’t able to be decided by this optimization using diffusion factor. But, in this paper, the mixed flow angle is able to be decided by the number of blade and optimum solidity. As the best solidity of three stream lines is obtained, the axial coordinates of impeller inlet and outlet are obtained. The more detailed optimum mixed flow impeller meridian shape is drawn.
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Vasiliev, Alexander. „Application of Thermal Hydraulic and Severe Accident Code SOCRAT/V3 for Calculation of Air Ingress Experiment QUENCH-16“. In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65730.
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The thermal hydraulic and SFD (Severe Fuel Damage) best estimate computer modelling code SOCRAT/V3 has been used for the calculation of QUENCH-16 experiment which was performed in the frame of the EC supported LACOMECO programme. The QUENCH-16 test conditions simulated a representative scenario of LOCA (Loss of Coolant Accident) nuclear power plant accident sequence in which the overheated up to 1800K core would be reflooded from the bottom by ECCS (Emergency Core Cooling System). The QUENCH-16 experiment included the following phases: first heat-up phase, pre-oxidation phase, slow cool-down phase (preparatory to air ingress), air ingress phase and bottom water flooding phase. The test QUENCH-16 was successfully conducted at the Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany, on July 27, 2011. The primary objective of this test was to investigate the oxidation of Zircaloy in the air following a limited pre-oxidation in the steam and to achieve a long period of oxygen starvation to promote the interaction with the nitrogen. Unexpectedly high cladding oxidation rate was detected during flooding phase which resulted in huge hydrogen production in QUENCH-16. It was due to zirconium nitride (ZrN) formation in a cladding which induced a diffusion transparency of zirconium dioxide layer. QUENCH facility is designed for studies of the PWR fuel assemblies behaviour under conditions simulating design basis, beyond design basis and severe accidents. SOCRAT/V3 computer modelling code was used for estimation of basic thermal hydraulic, oxidation and air ingress parameters in QUENCH-16. The calculated results are in a reasonable agreement with experimental data which justifies the adequacy of modeling capabilities of SOCRAT code for application to such a complicated test as QUENCH-16.
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Polanský, Jiří, und Roman Gášpár. „Optimization of the Thermodynamics Cycles of Generation IV Gas-Cooled Fast Reactors“. In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64565.
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This paper deals with the thermo-hydraulic properties of Generation IV Gas Cooled Fast Reactors. The paper is focused on the comparison of direct and indirect thermodynamic cycles of helium cooled reactors from a thermodynamic point of view. The calculation includes pressure losses at all major parts of the equipment — reactor, heat exchangers, pipe lines, etc. The compressor and the gas turbine efficiencies are included in calculation as well. The working fluid used in the primary circuit is helium. In the secondary circuit a mixture of helium and nitrogen is used. The cycle characteristic point and efficiency calculation reflects mixture properties of the real gas — especially for N2. Calculations point out the influence of the mixture composition on the basic structural parameters of the turbines, compressors and heat exchangers. Thermodynamic cycle efficiency, specific heat input/output, heat flux and cycle work will be presented as characteristic parameters.
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Zhou, Chunguo, Hongzhao Liu und Yahui Cui. „Analysis of Power Distribution and Sensitivity for the Power Synthesizer of Hybrid Electric Vehicle“. In ASME 2008 2nd International Conference on Energy Sustainability collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/es2008-54076.
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The Power Synthesizer of Parallel Hybrid Electric Vehicle (PHEV) has been the research object. It is composed of the differential gear train, in which its power distribution and sensitivity has been analyzed as main problems. The transmission ratio, torque and power distribution have been analyzed about the gear train. Whatever its structure is, if only the value of structure parameter K is same, then the corresponding relative kinematics relation and mechanics relation of the basic components are same absolutely. The calculation of power distribution among basic components has been introduced. The sensitivity has direct influence to the mobile performance of vehicle, so the angular speed response for output components to input components has been analyzed, and the connecting mode between engine or motor and differential gear train has been bought forward. The analytical results can be helpful for the parameters’ design of kinematics and dynamics of the vehicle, and for the vehicle’s control.
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Li, Yijun, Taehyun Shim, Dexin Wang und Timothy Offerle. „Investigation of Factors Affecting Steering Feel of Column Assist Electric Power Steering“. In ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9818.
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An application of electric power assist steering (EPAS) system has rapidly grown and overtaken hydraulic power assist steering (HPAS) system in recent automotive industry. The EPAS system has better fuel efficiency and potential application on vehicle dynamic control compared to HPAS. However, it is widely believed that the steering feel of EPAS system is inferior to HPAS system due to its mechanical construction. This paper first presents a comprehensive model of column electric power assist steering (CEPAS) system consisting of steering wheel, worm gear, assist motor, intermediate shaft, and rack and pinion. In this model, the friction in steering system is modeled by LuGre friction model and basic control strategies are also implemented. Using the proposed CEPAS model, the steering feel responses have been investigated with varying system parameters through simulation, and important factors affecting the steering feel response have been identified. This result gives insights on how the steering feel is affected by various factors and can be useful to improve the steering feel control algorithm design.
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Weber, Juliane, Linart Shabi und Jürgen Weber. „Thermal Impact of Different Cooling Sleeve’s Flow Geometries in Motorized High-Speed Spindles of Machine Tools“. In 9th FPNI Ph.D. Symposium on Fluid Power. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpni2016-1517.
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This paper presents an experimental investigation and computer simulation of motor cooling sleeves in machine tools’ spindles in order to examine their thermo-energetic behavior. First of all, most typical designs of cooling sleeves are identified, e. g. the single helical and the double helical channel structure. The paper highlights the simulation of these different cooling sleeve designs by means of network models with lumped parameters and computational fluid dynamics (CFD). With the help of CFD analyses, which can also take the conjugate heat transfer (CHT) into account, a profound understanding of the flow effects and the complex thermo-energetic exchange processes between the body and the flowing inside can be achieved. Because these very exacting CFD models require lengthy computation times, they have to be reduced to time-saving calculation models like network models. This step is essential for the planned integration in the control of the machine tool in order to correct the tool center point (TCP) errors due to thermo-elastic deformations. Finally, the developed thermo-hydraulic models are validated against measurements on a developed test rig utilizing thermocouples and a thermographic camera to capture temperatures. The results demonstrate that the presented models allow a sufficiently accurate characterization of the thermo-energetic behavior of motor spindles’ cooling sleeves in order to achieve enhanced prediction of the temperature distribution as well as an increase in manufacturing accuracy. In conclusion, it is shown how the resulting network calculation models can be used within the project group by integrating them into the complete model of the virtual machine tool in order to predict and correct its thermo-elastic deformations that will be part of the ongoing investigations.
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Berti, Simone, Pietro Fracassi, Alessandra Mattioli, Varuna Reddy Potula und Cristiano Lotti. „Design and Development of a Specially Modified Positive Displacement Rotary Screw Pump and Relevant Hydraulic Circuit to Enhance “Entrained Air Handling” Capability in a Closed Loop Lube Oil System“. In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94145.
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Rotary screw type positive displacement (RSPD) pumps are commonly used in Oil and Gas Industry for pumping of mineral lube oil in services where they can be mechanically driven by gears coupled to a train driver. Installation of these pumps is critical and should be designed jointly by vendors and users according to project specific restrictions (i.e. the arrangement of the entire oil circulation system). This paper describes a real case in which restrictions due to lube oil system arrangement have produced low pump suction head and have amplified the influence of air bubbles that remained entrained in oil despite lube oil tank degassing. The investigations have been directed toward the mathematical modeling of the aeration phenomenon coupled with experimental measurements of critical parameters taken on the shop plant. Among corrective actions identified and considered there are reduction of quantity of air entering the lube oil system and revamping of the entire lube oil system with changes in piping, tank and also in pump model together with special modifications of internal path to enhance air handling capabilities. In order to validate pump behavior with reference to resistance to aeration (monitoring noise and vibration) a special simulation set-up was jointly developed by end user and manufacturer on a pilot test bench to carry out the various performance tests. The numerical data collected during shop aeration test have confirmed that the pump was able to handle the expected amount of entrained air with noise and vibrations within industrial limits. The pumps tested in the pilot bench were installed at user’s site and the effectiveness of the synergic corrective actions listed above was successfully verified. The study concludes that an early estimation of entrained air in the lube oil system is critical for design and development of either the RSPD pump or the entire lube oil circuit of a motor compressor train. When a critical quantity of entrained air is likely to be reached at pump suction (near 10% in volume), pump manufacturers and end users should apply some basic rules related to “design for aeration” of the pump and agree on a non-routine test to be performed at manufacturer’s shop before pump installation at site. This will serve as a reliable prediction of pump air handling capabilities, without which effective operation, reliability and durability of the pump could be jeopardized.