• Title, Summary, Keyword: High speed application

Search Result 1,504, Processing Time 0.031 seconds

Vibration Characteristics Analysis of High Speed Rotary Bell Cup with Different Shapes and Dimensions (형상 및 치수 변화에 따른 고속 회전 벨 컵의 진동 특성 해석)

  • Park, Jiong-Min;Choi, Seung-Bok;Sohn, Jung Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.26 no.7
    • /
    • pp.857-864
    • /
    • 2016
  • In the present work, vibration analysis of high speed rotary bell cup model for paint atomizer application is carried out through numerical simulation. At first, eight bell cup models, considering four different cup shapes and two different cup diameters, are proposed and corresponding dynamic characteristics are investigated. To evaluate the operating stability, critical speed analysis is conducted using Campbell diagram and separation margin between operating speed and critical speed is identified. Unbalance vibration responses are also studied according to operating speed and balancing quality grade of G. Finally, the stability and adequacy of the proposed bell cup models are discussed for field application.

A Study on PWM Control of an Electro-Hydraulic Servo Indexing System (전기유압식 서보인덱싱 시스템의 PWM 제어에 관한 연구)

  • 허준영
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.23 no.2
    • /
    • pp.236-243
    • /
    • 1999
  • This study deals with the application of high speed on-off valves to an electro-hydraulic servo indexing system incorporated electro-hydraulic servo valces. Comparing with the electro-hydraulic servo valve the high speed on-off valve has some merits. Which included low price robustness to the oil contamination and dircect control without D/A converter. The considered sys-tem of this study is controlled by pulse width modulation(PWM) of the control law which is pro-duced by a PID controller which is used broadly in industrial equipments. The dynamic character-istics corresponding to variations of system parameters such as inertia moment system gain and supply pressure are investigated by computer simulation and experiment. Consequently the availability of the application of high speed on-off valve to servo indexing system instead of electro-hydraulic servo valve is confirmed.

  • PDF

Application of GIS Technology for Developing Emergency Management System on High-Speed Lines

  • Kim, Sang-Ahm;Hong, Seon-Ho;Wang, Jong-Bae
    • Journal of the Korean Society for Railway
    • /
    • v.6 no.3
    • /
    • pp.156-162
    • /
    • 2003
  • Due to almost all tracks of new Kyoungbu high-speed lines(HSL) consisting of bridges and tunnels, HSR operational safety management is very important factor for passenger safety and preventing catastrophic event. Especially, it is important to approach the scene of the accident and assist in saving lives as soon as possible under emergency conditions. Therefore it is essential to prepare access methods and available resources in advance in order to support emergency correspodances promptly and effectively. This paper persents an application of geographical information system(GIS) for developing emergency management system as well as batabase system on tracks and facilities, electric/communication equipment and safety equipment required to support emergencies. The on-site information on the proximity of HSL is expressed on the numerical map, which can be helpful to call external supports such as medical service, local authorities, police offices, fire brigades, and etc. for the emergency situations.

Commercial Development of a High Pressure Turbo Blower "Greenpressor" (고압 터보 Blower "Greenpressor" 개발)

  • Choi, Moon;Petrosyants, Vartan;Zakharova, Natalia
    • 유체기계공업학회:학술대회논문집
    • /
    • /
    • pp.323-323
    • /
    • 2003
  • Many recent development activities suggest the possibility of a high-speed turbo(centrifugal) compressor or blower for the industrial application of compressed air supplying system when used with the most advanced high-speed motor, inverter technology, and advanced bearing for high rotational speed. The problems to be overcome are of reliability, the application of mass production methods, cost effective manufacture and competitive running costs. This presentation is not focused on a specific technology advances but on an overall review of our recent experiences while we have developed the high pressure turbo blower for the commercial purpose.

  • PDF

Characteristic Analysis and Design of a Single Phase Switched Reluctance Motor for High Speed Application

  • Kim, Youn-Hyun
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
    • /
    • v.4B no.3
    • /
    • pp.114-121
    • /
    • 2004
  • Switched reluctance motors have received much attention as a driving means for various industrial applications because they have simple construction, low cost and high efficiency. Nevertheless, the requirements of drive converters make it difficult to lower the overall system cost as compared with the DC motor application. Single phase switched reluctance motors (SPSRMs) provide a solution to the high cost problem since the number of switching power devices can be reduced and consequently the trials for application are increased. However, research involving SPSRMs, especially in the area of design work, is insufficient. This paper introduces a novel design methodology of single phase SRM. The design work for SPSRM comprises the determination of many variables such as stator and rotor pole arc as well as on, off and so on. Managing all variable combinations leads to lengthy computation time and a fault in the design process. For that reason, a reliable technique and brief procedure term are required in SPSRM design.

A Study on the Influence of Nonlinearity Coefficients in Air-Bearing Spindle Parametric Vibration

  • Chernopyatov, Y.A.;Lee, C.M.;Chung, W.J.;Dolotov, K.S.
    • International Journal of Precision Engineering and Manufacturing
    • /
    • v.6 no.1
    • /
    • pp.51-58
    • /
    • 2005
  • The development of the high-efficiency machine-tools equipment and new cutting tool materials with high hardness, heat- and wear-resistance has opened the way to application of high-speed cutting process. The basic argument of using of high-speed cutting processes is the reduction of time and the respective increase of machining productivity. In this sense, the spindle units may be regarded as one of the most important units, directly affecting many parameters of high-speed machining efficiency. One of the possible types of spindle units for high-speed cutting is the air-bearing type. In this paper, we propose the mathematical model of the dynamic behavior of the air-bearing spindle. To provide the high-level of speed capacity and spindle rotation accuracy we need the adequate model of "spindle-bearings" system. This model should consider characteristics of the interactions between system components and environment. To find the working characteristics of spindle unit we should derive the equations of spindle axis movement under the affecting factors, and solve these equations together with equations which describe the behavior of lubricant layer in bearing (bearing stiffness equations). In this paper, the three influence coefficients are introduced, which describe the center of spindle mass displacement, angle of shaft rotation around the axes under the unit force application and that under the unit torque application. These coefficients are operated in the system of differential equations, which describes the spindle axis spatial movement. This system is solved by Runge-Kutta method. Obtained trajectories and amplitude-frequency characteristics were then compared to experimental ones. The analysis shows good agreement between theoretical and experimental results, which confirms that the proposed model of air-bearing spindle is correctis correct

A Primary Study on High Speed Intermodal Rail Freight Transportation (고속철도시대의 철도화물 수송정책-고속철도 복합운송을 중심으로)

  • Kim Hyun-Woog;Moon Dae-Seop
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.185-189
    • /
    • 2003
  • According to opening Seoul-Busan high speed rail line in 2004, we are studying to offer speedily for the parcel service of high speed rail-combined transport as it does, tender the quality freight services within a one and the same high speed train formation. Therefore, we reviewed for various types of HSR-combined transport and suggested to application methods in Korean high speed rail line. Through these kinds of approaches, we are able to expect the fulfillment of customer needs for high speed rail market segments, the profit maximization of future railway operating companies, and enhancement for cost-effective rail network operation of the mixed traffic on infrastructure cost-reduction in national logistics.

  • PDF

The Design Comparison of High-Speed & Common Railway Bridge with the Example of a Cable Supported Bridge (케이블 지지 교량을 예제로 한 고속철도 및 일반철도의 설계 차이점 분석)

  • Kim, Sung-Il;Byun, Hyung-Gyun
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.649-655
    • /
    • 2009
  • Traffic safety and vibration serviceability of a railway bridge set a limitation to the application of long-span cable supported bridges even though the design trend of the bridge becomes longer and lighter. In the case of high speed railway, it becomes more severe for the high speed of the train and resonance of the structure. Therefore, the cable supported bridge does not exist in Korea high speed railway until now. On the other hand, in recent, Italia, Japan and China do design and construct the long-span cable supported bridges for high speed railway recently with overcoming of traffic safety and passenger comforts. In the present study, prior to analysis of traffic safety and passenger comforts, a extradosed bridge for common railway is re-designed for high speed railway. The difference of member forces and displacements by design live load, the difference of impact coefficient and variable stresses of cables are investigated.

  • PDF

Channel Equalization for High-speed applications using MATLAB

  • Kim, Young-Min;Park, Tae-Jin
    • Journal of the Korea Society of Computer and Information
    • /
    • v.24 no.2
    • /
    • pp.57-66
    • /
    • 2019
  • This paper compared the performance with an overview of channel equalization techniques used in high-speed serial transceivers, including the homogeneous architecture and associated components for the GHz interconnect of backplane and cable channels. It also used the MATLAB tool to present system analysis and simulation results for continuous time equivalent structures. In the case of conventional continuous equalization, high frequency deficits occur due to the use of a comparator that is difficult to implement as well as the low speed limit. In this paper, the channel equalization technique based on the power spectrum analysis of clocks was used to compensate for the frequency loss, and the application of the TX+Channel and TX+Equalizer filters enabled the measurement of attenuation and equivalence without comparators. The application of blender and band-pass filters at high speeds also showed significant effectiveness.