• Title/Summary/Keyword: Air Tool

Search Result 814, Processing Time 0.023 seconds

Design of High Speed Machine Tool Spindle Regarding Vibration Characteristics (진동특성을 고려한 공작기계 초고속 주축 설계)

  • 김종관;박보용
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1991.04a
    • /
    • pp.99-103
    • /
    • 1991
  • 본 논고에서는 Radial 및 Axial 하중을 동시에 받을 수 있고, 예압에 의해 주축강성을 증대시킬수 있으며, Ball수의 증가로 부하능력을 향상시킨 초정 밀.초고속용 Angular ball bearing을 조합 사용하고, 고속회전에 지금까지 개 발된 ball bearing 윤활방법 중 가장 효과적인 간헐적인 oil 공급과 air 압력 으로, 계속 ball을 냉각, 윤활시켜주는 air oil 윤활법의 채용과, 국내 공작기 계 제조회사들이 주로 사용하는 일본 FAMUC AC Spindle motor(FAMUC-H type : 8000-15000rpm)를 사용해서 초고속 주축의 최적 설계조건을 제시하기 위한 기초연구 단계로 MT40-12000rpm 급의 Machining center용 Cartridge type의 Spindle unit개발을 통해서 주축설계에 따른 문제점과 연구용 주축제작의 생산 기술적 문제점 및 진동특성을 검토 하고자 한다.

  • PDF

The Study on Application of NOSS in Korea (한국에서의 NOSS적용에 관한 연구)

  • Choi, Youn-Chul
    • Journal of the Korean Society for Aviation and Aeronautics
    • /
    • v.18 no.2
    • /
    • pp.60-66
    • /
    • 2010
  • Normal Operations Safety Survey (NOSS), a methodology for capturing safety data during normal Air Traffic Control (ATC) operations. The NOSS methodology is based on the Threat and Error Management (TEM) framework, and is a safety management tool to monitor safety during normal aviation operations. Monitoring safety in normal operations is an essential activity within the safety management systems of Air Traffic Services (ATS) providing organizations, and NOSS is proposed as a suitable way to do this. This study, operating in the latter half of the year of 2010 in South Korea on NOSS was the understanding and to apply.

A Study on the Characteristics Test of Automation System Using AC servo motor and Air cylinder for press Load/Unload (AC 서보모터와 Air 실린더를 이용한 프레스 취출용 자동화 시스템 특성시험에 관한 연구)

  • 김재열
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1997.04a
    • /
    • pp.107-112
    • /
    • 1997
  • In this study of made Autmation system is moving linear transfer system for mainly forming of small electronic unit and other at press line. This system for loading and unloading a workpiece has been installed in a press in order to load and unload a workpiece from a press die. Main Control method be used PLC. It took data of input from each sensor and send signal of output to actuator by sequence program also, we try to Characteristics test of this system has good condition when operating with raser measurmant.

  • PDF

Development of Equilibium Flow Calculation Program Using a Modified Newtonian Method (수정 뉴토니안 방법을 이용한 평형유동 해석 프로그램 개발)

  • Choi, Jaehyeok
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.19 no.4
    • /
    • pp.483-491
    • /
    • 2016
  • A simple aerodynamic calculation program for high Mach number flow is developed by combining the modified Newtonian method with Tannehill's curve fits for the thermodynamic properties of air in equilibrium state. Aerodynamic characteristics for a parabolic nose are predicted and compared with CFD(Computational Fluid Dynamics) analysis results. Comparison shows good agreements, and the developed program is expected to be a practical tool for slender body aerodynamic calculation for high Mach number flow.

A Study on Exhaust Gas of Diesel Engine with a ULSD, CR-DPF and EGR (ULSD, CR-DPF와 EGR을 적용한 디젤기관의 배출가스에 관한 연구)

  • Moon, Byung-Chul;Oh, Yong-Suk
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.15 no.5
    • /
    • pp.85-90
    • /
    • 2006
  • Since air pollution has become a globally critical issue and exhaust emissions from automobiles cause a major source of air pollution, many countries including advanced countries have stipulated stringent emission regulations. This test was conducted on the effect of continuous regeneration diesel particulate filter and cooled-EGR, and 15ppm low sulfur diesel was used as a test fuel. Exhaust emissions, PM, NOx, CO, HC and Soots were measured and compared under D-13modes. Through durability test on diesel particulate filter, regeneration characteristics and control technology on PM were investigated in overall.

A Development of Data-Driven Aircraft Taxi Time Prediction Algorithm (데이터 기반 항공기 지상 이동 시간 예측 알고리즘 개발)

  • Kim, Soyeun;Jeon, Daekeun;Eun, Yeonju
    • Journal of the Korean Society for Aviation and Aeronautics
    • /
    • v.26 no.2
    • /
    • pp.39-46
    • /
    • 2018
  • Departure Manager (DMAN) is a tool to optimize the departure sequence and to suggest appropriate take-off time and off-block time of each departure aircraft to the air traffic controllers. To that end, Variable Taxi Time (VTT), which is time duration of the aircraft from the stand to the runway, should be estimated. In this paper, a study for development of VTT prediction algorithm based on machine learning techniques is presented. The factors affecting aircraft taxi speeds were identified through the analysis of historical traffic data on the airport surface. The prediction model suggested in this study consists of several sub-models that reflect different types of surface maneuvers based on the analysis result. The prediction performance of the proposed method was evaluated using the actual operational data.

Design of an Aquifer Thermal Energy Storage System (I) : Isothermal Analysis (지하대수층을 이용한 축열시스템의 설계 (I) : 등온해석)

  • Song, Y.K.;Lee, K.S.;Lee, T.H.;Kim, Y.H.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.5 no.2
    • /
    • pp.102-110
    • /
    • 1993
  • An isothermal analysis was conducted to develop the design tool of an aquifer thermal energy storage system. Taejeon aquifer was chosen for the analysis, and the variation of FRE(Fluid Recovery Efficiency) with respect to the aquifer natural velocity and thermal load were investigated. The analysis results were compared with those of ATESSS(Aquifer Thermal Energy Storage System Simulator) and agreed within 2% of discrepancy. It is recommended, based on the result of this study, that the system may be suitable for a large volume of hot or chill thermal energy storage system, such as for district heating or cooling.

  • PDF

Enhancement of HF Gas Removal Efficiency of a Scrubber in Semiconductor Manufacturing Process by using ANCOVA Technique (ANCOVA를 이용한 반도체공정 스크러버 HF 가스 제거 개선)

  • Kim, S.J.;Lee, M.;Xu, J.;Lim, S.;Lee, H.;Koo, J.
    • Journal of ILASS-Korea
    • /
    • v.18 no.2
    • /
    • pp.81-86
    • /
    • 2013
  • To comply with the regulation of the reinforcing Clean Air Conservation Act, it is necessary for the semiconductor manufacturers to develop effective low-concentration acid gas abatement system to treat the flue gas. The low-concentration acid gas was found to be harder to deal with than the high-concentration one. In this study, the effect of various potential treatments such as air-assist nozzle spraying, magnetizing the scrubbing water, and adding surfactants to spraying and scrubbing water were investigate through the application of the statistical ANCOVA method, which was proved to be very useful tool when the inlet concentration of acid gas could not be controlled precisely and it affected the removal efficiency of the abatement system.

Micro-groove Cutting Experiments using Micro-Machining System (미세가공 시스템을 이용한 미세 그루브 가공실험)

  • 이선우;이동주;이응숙;제태진
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2001.04a
    • /
    • pp.263-268
    • /
    • 2001
  • The needs for precision machining of micro to milli parts have been increased as the industry require high quality products, especially for the micro-machining of IT products. The ultra-precision machining system is essential for the micro machining of fine structures, which insures machining accuracy, low systematic and random error and repeatability. In this study, we developed micro machining system, which is equipped with air bearing stage for ultra precision machining and also we present the results of V-grooving experiments, conducted by the developed system, to verify the performance of system. The results show that the machined V-grooving had good accuracy with repeatable stability.

  • PDF

A Study on Compressor Seal for Automotive Air-conditioner using Polymer Resin (고분자 수지를 이용한 자동차 에어컨용 압축기의 씰에 관한 연구)

  • 정태형;하영욱
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.11 no.5
    • /
    • pp.81-87
    • /
    • 2002
  • The existing compressor steel seal used in automotive air-conditioner has the problem of oil leakage and deterioration in shielding performance, due to the abrasion and corrosion of the material. A new type of polymer resin seal studied in this research has the characteristics of high anti-abrasiveness and anti-corrosiveness, which can oversome the defects of the steel seal. In addition, the seal needs lower manufacturing cost and is appropriate to mass production, because it is made by the injection molding method requiring no mechanical processing. The profile generation program for seal mold has been developed using the gradient method, and the molding characteristics of the seal have analyzed through the flow analysis and the warpage analysis. The program has been verified by comparing the analysis results with the measured data of the test product. The research might be said to provide the basic method to produce the polymer resin seals with various types and dimensions.