• Title/Summary/Keyword: 입력축 연결

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Design of CVT Composed of a K-H-V type Differential Gear Unit and a V-Belt Drive (K-H-V형 차동기어장치와 V-벨트식 기구를 결합한 무단변속기의 설계)

  • 김연수;박재민;정찬길;최상훈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.799-802
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    • 2002
  • Continuously variable transmission(CVT) mechanisms considered here combine the functions of a K-H-V type differential gear unit and a V-belt type continuously variable unit(CVU). As combining the functions of a K-H-V type differential gear unit and a V-belt type CVU, 24 different mechanisms are presented. Some useful theoretical formula related to speed ratio, power flow and efficiency are derived and analyzed. These mechanisms have many advantages which are the decrease of CVT size, the increase of overall efficiency, the extension of speed ratio range, and the generation of geared neutral.

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Power Flow and Efficiency of Input Coupled type CVT combined Differential Gear Unit (차동기어장치를 적용한 입력축 연결방식 무단변속기의 동력흐름 및 효율해석에 관한 연구)

  • Kim, Yeon-Su;Choi, Sang-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.11
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    • pp.141-150
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    • 2000
  • Continuously variable transmission(CVT) combined differential gear unit has many advantages, which are the decrease of CVT size, the increase of overall efficiency, the extension of speed ratio range, and the generation of geared neutral. It is known that such CVT can be classified into the input coupled type and the output coupled type according to the coupling location of continuously variable unit(CVU). In this paper, six different configurations of input coupled type CVT combined V-belt CVU and 2K-H I type differential gear unit are proposed. Some useful theoretical formula related to speed ratio, power flow and efficiency are derived and analyzed. The propriety of derived formula and theoretical analysis are proven by various experiments.

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Performance of CVTs Composed of a Differential Gear Unit and a V-belt Drive (차동기어장치와 V-벨트식 변속기구를 결합한 무단변속기의 성능)

  • 최상훈
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.2
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    • pp.199-208
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    • 2003
  • Continuously variable transmission (CVT) mechanisms considered here combine the functions of a K-H-V type differential gear unit and a V-belt type continuously variable unit (CVU). As combining the functions of a K-H-V type differential gear unit and a V-belt type CVU, 24 different mechanisms are presented. Some useful theoretical formula related to speed ratio, power flow and efficiency are derived and analyzed. These mechanisms have many advantages which are the decrease of CVT size, the increase of overall efficiency, the extension of speed ratio range, and the generation of geared neutral.

A study on Korean character recognition using the sun of unit vector (단위벡터를 이용한 한글 인식에 관한 연구)

  • Cheon, Su-Yeon;Jo, Dong-Seop
    • Proceedings of the KIEE Conference
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    • 1987.07b
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    • pp.1104-1106
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    • 1987
  • 본 논문은 한글 자모 인식에 관한 새로운 방법을 제시한다. 본 연구는 한글패턴을 독립된 자소의 부분패턴으로 나누어서 특정점들(끝점, 7굴곡점, T굴곡점)을 추출하여 각 굴곡점에서 연결되는 점과의 벡터를 글자의 크기에 관계없도록 하기 위해 크기가 1인 단위벡터를 구한 후 이들의 합성벡터를 생성한다. 생성된 합성벡터들의 수, 벡터들이 지준축과 이루는 각, 그리고 특정점들의 수로부터 한글의 기본 자모를 분류하는 과정을 연구하였다. 입력된 한글패턴은 이미 세선화가 된 자모패턴으로 하였다.

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A Study of the One-Stage Axial Turbine Performance with Various Axial Gap Distances between the Stator and Rotor (정.동익 축방향 간격에 따른 단단 축류터빈의 성능시험에 관한 연구)

  • Kim, Dong-Sik;Cho, Soo-Yong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.4
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    • pp.99-105
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    • 2002
  • The performance test of an axial-type turbine is carried out with various axial gap distances between the stator and rotor. The turbine is operated at the low pressure and speed, and the degree of reaction is 0.373 at the mean radius. The axial-type turbine consists of ons-stage and 3-dimensional blades. The chord length of rotor is 28.2mm and mean diameter of turbine is 257.56mm. The power of turbo-blower for input power is 30kW and mass flow rate is $340m^3$/min at 290mmAq static-pressure. The RPM and output power are controlled by a dynamometer connected directly to the turbine shaft. The axial gap distances are changed from a quarter to three times of stator axial chord length, and performance curves are obtained with 9 different axial gaps. The efficiency varies about 8% of its peak value due to the variation of axial gap on the same non-dimensional mass flow rate and RPM, and experimental results show that the optimum axial gap is 1.6-1.9Cx.

Study on Shift characteristic of Small reducer using Eccentric arm (편심캠을 이용한 소형감속기의 변속특성에 관한 연구)

  • Youm, Kwang-Wook;Ham, Seong-Hun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.3
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    • pp.609-614
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    • 2017
  • In this study, a new type of eccentric cam was used for the development of a small size reducer with a two-shift reduction ratio while maintaining the same volume as the existing one-shift speed reducer. Therefore, a two-shift speed reducer was designed using the concept of a continuously variable transmission applied to automobiles. The cam was designed to have an eccentric shape with a $180^{\circ}$ phase difference to act as a tensioner to minimize slip by squeezing the V-belt connected to the deceleration pulley and the acceleration pulley, respectively. The cam was designed to have a diameter of 35mm and an outer diameter of 18mm so that the outer portion of the v-belt could contact the cam perfectly. A pulley with a diameter of 50.8mm was installed on the low speed pulley input shaft for deceleration and a pulley with a diameter of 76.2mm was provided on the output shaft. In the high-speed pulley for acceleration, a pulley with a diameter of 76.2mm is provided on the input shaft, and a pulley with a diameter of 50.8mm is provided on the output shaft. Based on the design details, the power transmission efficiency test and the heating characteristics of the transmission were tested to verify the feasibility. In addition, through validation, the suitability of the reducer was demonstrated.

Operation limits analysis of PW206C turboshaft engine In manual mode (PW206C 터보축 엔진의 수동운용범위 분석)

  • Lee, Chang-Ho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2007.11a
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    • pp.339-342
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    • 2007
  • The power control system of Smart UAV is similar to the propeller pitch governing concept of turboprop aircraft. The pilot inputs the engine power directly and the pitch governor controls the propeller pitch to maintain the propeller RPM. The manual back-up system of PW206C engine is used for the engine power control of Smart UAV. Engine performance estimation program is used to predict the control range of power lever arm(PLA) angle according to the variation of flight altitude and speed. These data provide a guide for the engine control in manual mode operation.

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A Study on the Empirical Modeling of Rubber Bushing for Dynamic Analysis (동역학 해석을 위한 고무부싱의 실험적 모델링에 대한 연구)

  • Sohn, Jeong-Hyun;Baek, Woon-Kyung;Kim, Dong-Jo
    • Elastomers and Composites
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    • v.39 no.2
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    • pp.121-130
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    • 2004
  • A rubber bushing connects the components of the vehicle each other and reduce the vibration transmitted to the chassis frame. A rubber bushing has the nonlinear characteristics for both the amplitude and the frequency and represents the hysteretic responses under the periodic excitation. In this paper, one-axis durability test is performed to describe the mechanical behavior of typical vehicle elastomeric components. The results of the tests are used to develop m empirical bushing model with an artificial neural network. The back propagation algerian is used to obtain the weighting factor of the neural network. A numerical example is carried out to verify the developed bushing model and the vehicle simulation is performed to show the fidelity of proposed model.

Optimization of Gear Webs for Rotorcraft Engine Reduction Gear Train (회전익기용 엔진 감속 기어열의 웹 형상 최적화)

  • Kim, Jaeseung;Kim, Suchul;Sohn, Jonghyeon;Moon, Sanggon;Lee, Geunho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.48 no.12
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    • pp.953-960
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    • 2020
  • This paper presents an optimization of gear web design used in a main gear train of an engine reduction gearbox for a rotorcraft. The optimization involves the minimization of a total weight, transmission error, misalignment, and face load distribution factor. In particular, three design variables such as a gear web thickness, location of rim-web connection, and location of shaft-web connection were set as design parameters. In the optimization process, web, rim and shaft of gears were converted from the 3D CAD geometry model to the finite element model, and then provided as input to the gear simulation program, MASTA. Lastly, NSGA-II optimization method was used to find the best combination of design parameters. As a result of the optimization, the total weight, transmission error, misalignment, face load distribution factor were all reduced, and the maximum stress was also shown to be a safe level, confirming that the overall gear performance was improved.

A Real Time Distance Measurement System Using the Stereo Vision (스테레오 비젼을 이용한 실시간 거리 측정 시스템)

  • Park, Hyun-Suk;Lee, Yill-Byung
    • Proceedings of the Korea Information Processing Society Conference
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    • 2005.11a
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    • pp.751-754
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    • 2005
  • 본 논문에서는 인간의 머리부분을 흉내 낸 시각 시스템으로서, 4 축의 각도 조절이 자유로운 시스템에 두 개의 CCD 카메라를 연결하여 실시간으로 입력되는 영상 데이터로부터 레이져 포인터의 위치 정보를 추출한 후 주 카메라를 이용하여 시스템 전체를 레이저 포인터의 중심위치로 이동한 후 버전스 각도(vergence angle)를 이용하여 실시간으로 오브젝트의 절대거리를 측정하는 효과적인 시스템을 제안하였다. 객체까지의 거리는 교차식 카메라를 적용한 스테레오 비전 시스템을 사용하여 삼각측량의 방법으로 거리를 측정하였다. 실험결과 객체에 대한 거리 측정 오차가 평균 2% 나타남으로써 제안한 알고리즘을 이용한 이동객체의 거리측정 가능성을 제시하였다.

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