• Title/Summary/Keyword: High RPM

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Selection of Bearing Position for Improving Static and Dynamic Stiffness of 40,000rpm High-speed Spindle (40,000rpm 고속 주축의 정·동특성 향상을 위한 베어링 위치 선정)

  • Lim, Jeong Suk;Chung, Won Jee;Lee, Choon Man
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.8 no.1
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    • pp.10-17
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    • 2009
  • Spindle design is very important for the improvement of the competitive power in production cost of high quality machine tools. The important factor in spindle design is not only to improve the natural frequency of spindle but also to reduce displacement of spindle end. In this paper, parameters those influence on static and dynamic stiffness of high-speed spindle have selected form preceding studies. And those selected parameters are applied to Taguchi Method. To perform FEM analysis, bearing conditions are selected with optimized condition. To know how to improve static and dynamic stiffness of machine tool spindle, natural frequency and displacement of spindle end are obtained by FEM analysis. The Taguchi Method was used to draw optimized condition of bearing position and it's stiffness. From these results, amplitude of vibration is enough good less than $3{\mu}m$ pk-pk of the spindle of 40,000rpm manufactured in this work by the optimal design.

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The Development of DSP Based Multi Controller for Direct Drive Method Turbo Compressor (DSP를 이용한 직접 구동방식의 터보 압축기용 통합 제어기 개발)

  • 권정혁;변지섭;최중경;류한성
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.6 no.6
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    • pp.885-890
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    • 2002
  • Turbo compressor needs high speed rotation of impeller in structure, high rated gearbox and conventional induction motor. This mechanical system increased the moment of inertia and mechanical friction loss. Resently the study of turbo compressor applied super high speed motor and drive, removing gearbox made its size small and mechanical friction loss minimum. In this study we tried to develope variable super high speed motor controller, compressor controller and MMI controller under one DSP based systems for 1500Hp, 70,000rpm direct drive Turbo compressor. It have to do unitification of each controller"s hardware and software. The result of study is applied to a 150Hp direct turbo compressor and makes it goods.oods.

A Numerical Analysis for High Performance on DME High Pressure Fuel Pump Using Taguchi Method (Taguchi Method 을 이용한 DME 고압 연료 펌프에 대한 고성능 수치 해석)

  • SAMOSIR, BERNIKE FEBRIANA;CHO, WONJUN;LIM, OCKTAECK
    • Journal of Hydrogen and New Energy
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    • v.32 no.6
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    • pp.636-641
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    • 2021
  • Using numerical analysis, various factors influencing the performance development of high-pressure pumps for Dimethyl Ether (DME) engines were identified and the impact of each factor was evaluated using Taguchi method. DME fuels are more compressive than diesel fuels and have the lower heat generation, so it is necessary to increase the size of the plunger and speed (RPM) of the pump as well. In addition, it is necessary to change the shape and design of control valve to control the discharge flow and pressure. In this study, various variables affecting the performance and flow rate increase of high-pressure pumps for DME engines are planned using Taguchi method, and the best design method is proposed using correlation of the most important variables. As a result, we were able to provide the design value needed for a six-liter engine and provide optimal conditions. The best combination factors to optimize the flow rate at RPM 2,000 and diameter plunger with 20 mm. The regression equation can also be used to optimize the flow rate; -8, 13+0, 2552 RPM +54, 17 diam. Plunger.

Study on the Morphology of the PC/ABS Blend by High Shear Rate Processing (PC/ABS 블렌드의 고속전단성형에 따른 모폴로지 변화에 관한 연구)

  • Lee, Dong Uk;Yong, Da Kyoung;Lee, Han Ki;Choi, Seok Jin;Yoo, Jae Jung;Lee, Hyung Il;Kim, Seon-Hong;Lee, Kee Yoon;Lee, Seung Goo
    • Korean Chemical Engineering Research
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    • v.52 no.3
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    • pp.382-387
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    • 2014
  • The PC/ABS blends were manufactured with high shear rate processing. Changes of the blend morphology were analyzed according to the screw speed and processing time. To find optimal conditions of the high shear rate processing of the PC/ABS blend, blend morphology and size of the dispersed phase, ABS, were observed with a SEM. Also, tensile properties of the PC/ABS blends were measured to investigate the effect of the high shear rate process with the screw speed of 500 rpm to 3000 rpm for processing times of 10s to 40s. Especially, to observe the dispersed phase of the PC/ABS blend clearly, fracture surfaces of the PC/ABS blend were etched with chromic acid solution. As screw speed and processing time increase, dispersed phase size of the PC/ABS blend decreases and mechanical properties of the blend decrease as well. Especially, at screw speed over than 1000 rpm of high shear rate processing, mechanical properties of the PC/ABS blends decrease drastically due to the degradation of the blend during the high shear rate processing. Consequently, the optimal condition of screw speed of the high shear processing of the PC/ABS blend is set at 1000rpm, in this study. Under optimal condition, the PC/ABS blend has relatively high mechanical properties with the relatively stable micro-structure having nanometer scale dispersed phase.

Digital Controller Design of a Magnetic Bearing System for High Speed Milling Spindle (고속 밀링 주축용 자기베어링 시스템의 디지털 제어기 설계)

  • 노승국;경진호;박종권
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.04a
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    • pp.398-403
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    • 2004
  • The demand of high speed machining is increasing because the high speed cutting providers high efficiency of process, short process time, improved metal removal capacity and better surface finish. Active magnetic bearings allow much high surface speed than conventional ball bearings and therefore greatly suitable for high speed cutting. The automatic control concept of magnetic bearing system provides ability of intelligent control of spindle system to increase accuracy and flexibility by means of adaptive vibration control. This paper describes a design and development of a milling spindle system which includes built-in motor with power 5.5㎾ and maximum speed 70,000rpm, HSK-32C tool holer and active magnetic bearing system. Magnetic actuators are designed for satisfying static load condition. The Performances of manufactured spindle system was examined for its static and dynamic stiffness, load capacity, and rotational accuracy. This spindle was run up to 70,000 rpm stably, which is 3.5 million DmN.

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Machining Characteristics of Nickel-Chrome Alloy according to Changing with Ultra High-Speed RPM (초고속 RPM변화에 따른 니켈-크롬 합금의 밀링가공 특성 평가)

  • Lee, Seung-Jun;Choi, Soo-Chang;Kim, Jin-Geun;Shin, In-Dong;Lee, Deug-Woo;Lee, Jong-Ryul
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.2
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    • pp.1-5
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    • 2010
  • According to the high demand of hybrid components, the hybrid materials development and processing technology were increased in the industry field. Although hybrid materials have various machining technologies, the research about them has rarely been proceed. This study is to carry out results about design technology of miniaturized high-speed air spindle and machining characteristics of hybrid materials using that. We studied machining characteristics in Nickel-Chrome alloy(Ni-Cr) according to change rotating speed using miniaturized high-speed air spindle. As the following results, the change of surface shape and roughness was investigated as the processing conditions such as rotating speed of miniaturized high-speed air spindle.

Development of Micro Tool using High Speed Etching Process (고속 회전에칭을 이용한 미세공구의 개발)

  • 김성헌;박준민;정해도
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.959-962
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    • 2000
  • In this study, the micro shaft was fabricated by high speed etching process. The integration of the kinetic energy of circumference and the effect of etching takes less time to fabricate the micro shaft than any other conventional methods. First, the end part of the rod(SKD11) was dipped in chemical solution(FeCl$_3$) and the rod rotated at high speed(3500-10000rpm). Experimental setup was simply composed of high speed motor. chemical solution and $\Phi$ 1 mm rod. The main factors of diameter control are chemical concentration, reaction time and rpm. has a result. the diameter of the dipped rod was decreased by 200${\mu}{\textrm}{m}$ by high speed rotation and its shape and surface was good. From this experiment, we found the possibility to manufacture micro shaft without very expensive equipment.

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Thermal Decomposition and Mechanical Properties of Polycarbonate/ABS Blends Prepared by High Shear Rate Processing (고속전단에 의한 폴리카보네이트/ABS 블렌드의 열분해 및 기계적 특성 연구)

  • Yoo, Jae Jung;Yong, Da Kyoung;Lee, Han Ki;Kim, Dae Sik;Lee, Hyung Il;Kim, Sun Hong;Lee, Kee Yoon;Lee, Seung Goo
    • Polymer(Korea)
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    • v.38 no.4
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    • pp.471-476
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    • 2014
  • Polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS) blends were prepared using a high shear extruder to investigate their thermal decomposition and mechanical properties with shear rate and shear time. In this experiment, high shear rate, from 1000 to 3000 rpm, in blending process was applied for 10 to 40 sec, respectively. At high shear rate over than 2000 rpm, the initial decomposition temperature was dropped significantly compared to a compounded sample because of thermal decomposition of the blend by high shear. Consequently, high shear processing gave an important effect on the mechanical and thermal properties of the PC/ABS blend. In particular, elongation of the blend decreased significantly with shear rate.

Applicability of Washing Techniques Coupled with High-Pressure Air Jet for Petroleum-contaminated Soils (고압공기분사를 이용한 유류오염토양 세척기법의 적용성 연구)

  • Choi, Sang-Il;Kim, Kang-Hong
    • Journal of Soil and Groundwater Environment
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    • v.11 no.6
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    • pp.61-68
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    • 2006
  • Soil washing techniques coupled with high pressure air jet were applied for diesel-contaminated soils sampled by an underground oil reservoir of which the initial total petroleum hydrocarbon (TPH) ($2,828{\pm}206\;mg/kg$) exceeded 5 times of current standard level (500 mg/kg) regulated by the Soil-Environment Conservation Law. Through several tests, we found that the position of impeller has a critical impact for washing efficiencies. The highest washing efficiency was obtained at an oblique angle (30 degree) for the impeller and optimized mixing speed (300 rpm) that could have high shearing forces. Considered economical and feasible aspects, the optimum mixing time was 10 min. Rate constants of TPH removal derived from the first-order equation were not linearly increased as mixing speed increased, indicating that mechanical mixing has some limits to enhance the washing efficiencies. Application of high-pressure air jet in washing process increased the washing efficiency. This increase might be caused by the fact that the surface of micro-air bubbles strongly attached hydrophobic matters of soil particles. As the pressure of air jet increased, the separation efficiencies of TPH-contaminated soil particles increased. In the combined process of high-pressure air jet and mixing by impeller, the optimum mixing speed and air flow-rate were determined to be 60 rpm and $2\;kg/cm^2$, respectively. Consequently, the washing technique coupled with high-pressure air jet could be considered as a feasible application for remediating petroleum-contaminated soils.

Prediction of Power and Efficiency Requirement of Motor/generator for 500W Class Micro Gas Turbine Generator Considering Losses (손실을 고려한 500W급 마이크로 가스터빈 발전기용 전동발전기의 요구동력 및 요구효율 선정)

  • Park, Cheol-Hoon;Choi, Sang-Kyu;Ham, Sang-Yong
    • The KSFM Journal of Fluid Machinery
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    • v.14 no.5
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    • pp.24-30
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    • 2011
  • 500W class MTG(Micro turbine generator) operating at 400,000 rpm is under development. From the cycle analysis, it is decided that the self-sustaining speed of MTG is 200,000rpm and the generating speed is 400,000 rpm. Therefore, motor should be designed so that it is able to rotate the rotor up to 200,000rpm and generator should designed so that it is able to generate 500W output at 400,000rpm. First step to design motor/generator is to determine the power and efficiency requirement. Not only the power into the compressor and from the turbine at the operating speed but also the mechanical and electrical losses should be considered in determining the power and efficiency requirement. This study presents the procedure and the results of determining the power and efficiency requirement considering the mechanical and electrical losses depending on the rotating speed which is measured from the experiment.