• Title/Summary/Keyword: Rotary type

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A Mathematical Model on the Absorption Rate of Carbon-Dioxide in Mixed Gas During the Transient State of Rotary Type Absorbers (과도상태의 회전형 흡수기에서 혼합기체 중 이산화탄소 흡수량 계산 모델)

  • Paik, Hyun-Jong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.26 no.12
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    • pp.1729-1737
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    • 2002
  • A mathematical model for the prediction of carbon-dioxide absorption rate during the transient state of rotary type absorber is developed. The rotary type absorber operates using a fast rotating porous structure and clean water. The model for the transient state rotary type absorbers is based on the steady state model of packed tower absorber. The paper manipulates the operating data of an arbitrary quasi-steady state condition of rotary type absorber for the determination of the coefficients involved in the model developed. The prediction accuracy is evaluated from the measured data of rotary type absorber operated under fast transient state. The measured data include the mole fraction of carbon dioxide in mixed gas and the pressure of absorber. The relative error in carbon dioxide prediction is estimated to be 20% at maximum. The model is successfully applied for the prediction of the behavior of a closed cycle diesel engine.

Design of High-Speed LSM Rotary Type Testing Machine in Consideration of Mechanical Strength (기계적 강도를 고려한 초고속 선형동기전동기 회전형 시험기 설계)

  • Seol, Hyun-Soo;Park, Eung-Seok;Lee, Ju;Park, Chan-Bae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.5
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    • pp.824-829
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    • 2015
  • The rotary type testing machine undergoes mechanical stress as an external force is applied. In case of the rotary type testing machine, even a tiny flaw results in a fatal demage because the size of the machine is huge. Therefore, when designing the rotary type testing machine, it is necessary to secure a safety factor with the mechanical stress analysis in order to prevent the machine from being destroyed due to scattering or transformation of rotating field. This thesis proposes a LSM rotary type tesitng machine which rotates at the speed of up to 600km/h. And the mechanical stress is considered in order that the safety factor remains above 1.5 at the maximum speed. In addition, because normal force as well as thrust occurs in the machine, the normal force exerted was considered through the strength analysis. Finally, a design plan which enables to weaken the normal force affecting the rotary type testing machine is introduced and its validity is proved by the results of FEM analysis.

A High Voltage Pulse Generator Using a Rotatary Airhole Spark Gap Code (회전 공극형 고전압 펄스발생장치)

  • 문재덕;이종훈;이복희
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.5
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    • pp.268-272
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    • 2004
  • A high voltage pulse generator with a rotator airhole spark gap instead of a rotary ball spark gap has been proposed and investigated. Its feasibility as a high voltage pulse generator is compared with the rotary ball spark gap type one. Parametric studies showed that proposed the rotary airhole type spark gap had a very stable breakdown voltage and reliable pulse repetition time compared with the conventional rotary ball type spark gap. This however showed that the proposed pulse generator with a rotary airhole spark gap instead of a rotary ball spark gap could be potentially used as a very stable and reliable pulse generator in the various fields of applications.

A study on the Characteristics of the Blowing type Rotary Burner (송풍형 로터리 버너의 특성 연구)

  • Choi Y. H.;Kim K. H.;Yoon S. J.
    • Proceedings of the KSME Conference
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    • 2002.08a
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    • pp.303-306
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    • 2002
  • Liquid atomization by means of a spinning cup is widely used as a device for combustion, in cooling and spray drying. In this study, the blowing type rotary atomizer was experimental carried out the investigations on the characteristics of the blowing type rotary atomizer which is an air flow energy of blower instead of an electric motor most commonly used to a driven energy. The analysis on the rotary cup speed, air velocity with the blower conditions was performed and also the drop size was measured using LDPA. It was tried to analyzed on air-nozzle size and liquid flowrate as the result. It was found that the increase of the relative velocity between liquid and air improve significantly atomization liquid, and decrease of the liquid flowrate improved the maximum drop size though the mean drop size is really the same.

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A Post-processing Method for 3 Rotary Type 5-axis Machines using Geometric Method (기하학적인 방법을 이용한 3 Rotary 형식 5축 가공기의 후처리 방법)

  • Yun, Jae-Deuk;Jung, Yoong-Ho;Park, Do-Hyun
    • Korean Journal of Computational Design and Engineering
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    • v.14 no.5
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    • pp.291-296
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    • 2009
  • This paper presents a post-processing algorithm for 5-axis machines with three rotary axes (3R-2L type). 5-axis machining needs the postprocessor for converting cutter location (CL) data to machine control (NC) data. The existing methods for post-processing use inverse kinematics equations from for-ward kinematics. However in case of 5-axis machines with three rotary axes, the inverse kinematics equations are not induced directly since the forward kinematics equations are non-linear. In order to get the joint values from the forward kinematics equations, previous algorithms use numerical method for the post-processing, which needs searching algorithms with computation time and may result in fail. This paper proposes a geometric method for the post-processing of 3 rotary type 5-axis machines. Our algorithm has three advantages: first, it does not need establishing forward kinematics equations. Second, it is reliable method that eliminates any numerical methods for the inverse kinematics, resulting in the exact solution. Finally, the proposed algorithm can also be applied to 2R-3L type of 5-axis machines.

Design of Prototype Rotary-Lineat Step Motor by the Finite Element Method (유한 요소법에 의한 2자유도 스텝모터의 설계)

  • 정태경;한송엽;원종수
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.35 no.12
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    • pp.567-572
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    • 1986
  • In this paper, a new type of step motor with two degree of mechanical freedom, which is named rotary-Linear Step Motor(RLSM), is presented. Its rotor axis can perform linear and rotary motions either separately or simultaneously. This paper discribes the design of RLSM using finite element method in which the magnetic saturation effect of the iron core is taken into account. The design parameters such as torques, forces and inductances are obtained from the computed magnetic vector potentials. A new type of Rotary-Linear Step Motor was constructed. The calculated parameters agree well with measurements.

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Development of a Separate Type Rotary Engine (Separate Type Rotary Engine 개발)

  • Ki, Dockjong;Choi, Heeju
    • Journal of the Korean Society of Propulsion Engineers
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    • v.21 no.4
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    • pp.71-78
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    • 2017
  • New concept rotary engine initial prototype has been developed. Engine motoring, compressor pressure and fuel combustion were tested for engine mechanism and operability check. Merits and demerits, applicable areas of the engine have been investigated against reciprocating and Wankel rotary engines. It was found that this engine is best fit for small aircraft and it is better than existing engines for motorcycle, portable and hybrid car Genset too.

Comparison of Work Performance of Crank-type and Rotary-type Rotavators in Korean Farmland Conditions

  • Nam, Ju-Seok;Kang, Dae-Sig;Kang, Young-Sun;Kim, Kyeong-Uk;Kim, Dae-Cheol
    • Journal of Biosystems Engineering
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    • v.37 no.3
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    • pp.140-147
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    • 2012
  • Purpose: This study was conducted to understand the work performance of crank-type rotavators and compare them with those of rotary-type rotavators in Korean farmland conditions. Methods: Tillage operations were carried out using both rotavators with the same nominal rotavating width and rated power. During the operations, PTO speed and torque, actual work speed, and rotavating width and depth were measured. To evaluate work performance, pulverizing ratio, inversion ratio, and specific volumetric tilled soil were calculated and compared for each rotavator. Results: It is found that the crank-type rotavator has better specific volumetric tilled soil performance and deep tillage, while the pulverizing ratio is worse. Conclusions: Crank-type and rotary type rotavator have diffenent properties each other in several work performances. It's important, therefore, to choose a suitable type of rotavator that satisfy the farmer's requirements in accordance with the condition of field and the purpose of tillage operation.

The evaluation for the operation surface mounters using a dynamic network (동적 네트워크를 이용한 표면실장기 운영 평가)

  • 이달상
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 1996.04a
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    • pp.570-573
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    • 1996
  • The evaluation test for the operation of rotary type surface mounters which consist of the reel axis, the index table and the X-Y table, has been performed by comparing the new method with the old one in only fields. Because the problem seeking for the optimal operation of rotary type surface mounters, is NP complete, it is almost impossible to get the optimal solutions of large problems. This paper deals with a dynamic network modeling, which can reduce the effort, the cost, and the time used for the performance test of rotary type surface mounters.

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Characteristic of Mirror Surface ELID Grinding of Large Scale Diametrical Silicon Wafer with Rotary Type Grinding Machine (로타리 연삭에 의한 대직경 Si-wafer의 ELID 경면 연삭특성)

  • 박창수;김원일;왕덕현
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.5
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    • pp.58-64
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    • 2002
  • Mirror surface finish of Si-wafers has been achieved by rotary in-feed machining with cup-type wheels in ELID grinding. But the diameter of the workpiece is limited with the diameter of the grinding wheel in the in-feed machining method. In this study, some finding experiments by the rotary surface grinding machine with straight type wheels were conducted, by which the possible grinding area of the workpiece is independent of the diameter of the wheels. For the purpose of investigating the grinding characteristics of large scale diametrical silicon wafer, grinding conditions such as rotation speed of grinding wheels and revolution of workpieces are varied, and grinding machine used in this experiment is rotary type surface grinding m/c equipment with an ELID unit. The surface ground using the SD8000 wheels showed that mirror like surface roughness can be attained near 2~6 nm in Ra.