• Title/Summary/Keyword: Power transmission mechanism

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Experimental and Parametric Study on the Output Coupled type Continuously Variable Transmission

  • Kim, Yeon-Su;Park, Jae-Min;Park, Sang-Hoon
    • International Journal of Precision Engineering and Manufacturing
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    • v.3 no.3
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    • pp.28-36
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    • 2002
  • The continuously variable transmission (CVT) mechanism considered here is the output coupled type which combines the functions of a 2K-H I type differential gear unit and a V-belt type continuously variable unit (CVU). One shaft of the CVU is connected directly to the output shaft and another shaft of it is linked to the differential gear unit. It is shown that some fundamental relations (speed ratios, power flows and efficiencies) for twelve mechanisms previously described are valid by various experimental studies, six of them produce a power circulation and the others produce a power split. Parametric analysis is carried out in relation to the efficiency, speed ratio and power ratios in order to assist in the design of an optimum configuration. Some useful properties associated with power flow modes also are discussed in the output coupled type continuously variable transmission.

Gear Train Design of 8-Speed Automatic Transmission for Tractor (트랙터 8단 자동변속기 기어 열 설계)

  • Jung, G.H.
    • Journal of Drive and Control
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    • v.10 no.2
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    • pp.30-36
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    • 2013
  • Tractor is a farm vehicle that is designed to provide a high tractive effort at low speed. It is used for versatile agricultural tasks such as hauling a trailer, tillage, mowing and construction work. Most older tractors use a manual transmission. However, as the intensity of work increases, tractors equipped with automatic transmission become popular due to the work convenience. In order to give the operator a large degree of control in field work, 24 gears with automatic 8-speed and manual 3-speed are arranged in transmission. This paper deals with the gear train that is designed for 8-speed automatic transmission by the engagement of multi-disk clutches. The gear ratio for each speed as well as power transmission mechanism is analyzed through velocity analysis. In addition, constraints of mesh gear ratio are derived by investigating the power flow path in velocity diagram for the given 8-speed gear ratio.

Mechanism Analysis and Stabilization of Three-Phase Grid-Inverter Systems Considering Frequency Coupling

  • Wang, Guoning;Du, Xiong;Shi, Ying;Tai, Heng-Ming;Ji, Yongliang
    • Journal of Power Electronics
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    • v.18 no.3
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    • pp.853-862
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    • 2018
  • Frequency coupling in the phase domain is a recently reported phenomenon for phase locked loop (PLL) based three-phase grid-inverter systems. This paper investigates the mechanism and stabilization method for the frequency coupling to the stability of grid-inverter systems. Self and accompanying admittance models are employed to represent the frequency coupling characteristics of the inverter, and a small signal equivalent circuit of a grid-inverter system is set up to reveal the mechanism of the frequency coupling to the system stability. The analysis reveals that the equivalent inverter admittance is changed due to the frequency coupling of the inverter, and the system stability is affected. In the end, retuning the bandwidth of the phase locked loop is presented to stabilize the three-phase grid-inverter system. Experimental results are given to verify the analysis and the stabilization scheme.

Efficient Aggregation and Routing Algorithm using Local ID in Multi-hop Cluster Sensor Network (다중 홉 클러스터 센서 네트워크에서 속성 기반 ID를 이용한 효율적인 융합과 라우팅 알고리즘)

  • 이보형;이태진
    • Proceedings of the IEEK Conference
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    • 2003.11c
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    • pp.135-139
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    • 2003
  • Sensor networks consist of sensor nodes with small-size, low-cost, low-power, and multi-functions to sense, to process and to communicate. Minimizing power consumption of sensors is an important issue in sensor networks due to limited power in sensor networks. Clustering is an efficient way to reduce data flow in sensor networks and to maintain less routing information. In this paper, we propose a multi-hop clustering mechanism using global and local ID to reduce transmission power consumption and an efficient routing method for improved data fusion and transmission.

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Ghost and Blocking of TV signal by UHV Transmission Lines (대형 송전선로에 의한 TV 전파장해 고찰)

  • Shin, Koo-Yong;Lee, Dong-Il
    • Proceedings of the KIEE Conference
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    • 1998.07e
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    • pp.1776-1778
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    • 1998
  • KEPCO has been constructing the 765 kV double circuit transmission line since 1997. It is worried that the 765 kV transmission lines make TV interference(Ghost and Blocking) due to high tower and multi sub-conductors. This paper presents the mechanism, the measuring method and the results of TV ghost and blocking measurement using a new TV ghost measurement system in a vehicle which was developed by KEPRI.

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A study on the efficient simulation methods for an automatic power transmission system applying dynamic torque constraint (동적 구속조건을 적용한 자동변속장치의 효과적인 시뮬레이션방법에 관한 연구)

  • Jeong, Heon-Sul;Lee, Kyo-Ill
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.22 no.3
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    • pp.504-518
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    • 1998
  • Degree-Of-Freedom(DOF) for most power transmission system varies according to the operation status which consists of friction elements to change the power flow or to adjust the speed ratio such as clutches, brakes or one-way clutches. To simulate the dynamic characteristics of automatic power transmission system which is a typical example of such a variable DOF systems, many sets of governing equations and complicated phase decision routines are necessary. In this paper dynamic constraint theorem is derived explaining the torque transmission characteristics during the clutch engagement process and a robust stable algorithm is developed describing this phase transition phenomenon effectively by introducing the concept of direct torque and virtual damping. Finally, applying this algorithm to a passenger car automatic transmission gear consisting of several friction elements, an efficient simulation methods for such a complex system will be suggested that is very simple and systematic.

Development of Transmission Pricing Package Based on Unified Modeling Language (UML 기반의 송전요금계산 패키지 개발)

  • 이찬주;박종배;신중린;김진호;김발호
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.2
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    • pp.111-120
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    • 2004
  • This paper presents an application of Unified Modeling Language(UML) software technique for developing transmission pricing evaluation package. Also, this paper describes a transmission pricing algorithm applicable to a large-scale power system. The usage-based transmission pricing mechanism is very complex since it requires power flow analysis, fault current analysis, sensitivity evaluation of a transmission line, penalty factors calculation, transmission asset databases, and cost allocation rules, etc. For the efficient and flexible development of the transmission pricing package, a UML. approach is applied, which is composed of a use-case diagram, interaction diagram, class diagram, and package diagram using Rational Rose Unified Process(RUP). The designed transmission pricing package can be efficiently modified and reused as the market environments evolves since it is designed by Object-Oriented Programming(OOP).

Distance-based Routing Mechanism in Mobile Sensor Networks (모바일 센서 네트워크에서 거리 기반 경로배정 메커니즘)

  • Kim, Jun Hyoung;Park, Jung Hyeon;Lee, Sung Keun;Koh, Jin Gwang
    • Smart Media Journal
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    • v.5 no.1
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    • pp.55-60
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    • 2016
  • Mobility of the sensor networks proposed a new way to the efficient design of sensor networks and improvement of network system performance. Mobility results in a number of functional changes in the MAC protocol and routing protocol. Especially, the mobility of the nodes may occur the increase of the overhead of transmission or disconnection of the link. Therefore, the study of the energy efficient transmission is very important in mobile sensor networks. This paper proposed adaptive transmission mechanism on the distance-based power control. The proposed mechanism was analyzed better than conventional method in the average energy consumption and network life by simulation results.

An Adaptive Transmission Power Control Algorithm for Wearable Healthcare Systems Based on Variations in the Body Conditions

  • Lee, Woosik;Kim, Namgi;Lee, Byoung-Dai
    • Journal of Information Processing Systems
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    • v.15 no.3
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    • pp.593-603
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    • 2019
  • In wearable healthcare systems, sensor devices can be deployed in places around the human body such as the stomach, back, arms, and legs. The sensors use tiny batteries, which have limited resources, and old sensor batteries must be replaced with new batteries. It is difficult to deploy sensor devices directly into the human body. Therefore, instead of replacing sensor batteries, increasing the lifetime of sensor devices is more efficient. A transmission power control (TPC) algorithm is a representative technique to increase the lifetime of sensor devices. Sensor devices using a TPC algorithm control their transmission power level (TPL) to reduce battery energy consumption. The TPC algorithm operates on a closed-loop mechanism that consists of two parts, such as sensor and sink devices. Most previous research considered only the sink part of devices in the closed-loop. If we consider both the sensor and sink parts of a closed-loop mechanism, sensor devices reduce energy consumption more than previous systems that only consider the sensor part. In this paper, we propose a new approach to consider both the sensor and sink as part of a closed-loop mechanism for efficient energy management of sensor devices. Our proposed approach judges the current channel condition based on the values of various body sensors. If the current channel is not optimal, sensor devices maintain their current TPL without communication to save the sensor's batteries. Otherwise, they find an optimal TPL. To compare performance with other TPC algorithms, we implemented a TPC algorithm and embedded it into sensor devices. Our experimental results show that our new algorithm is better than other TPC algorithms, such as linear, binary, hybrid, and ATPC.

Power Transmission Mechanism of Electrorheological Clutch Part III: Experimental considerations on performance of ER clutch (전기유변성 클러치의 동력전달 메커니즘 제3보 : ER 클러치 성능에 관한 실험적 고찰)

  • 이규한;심현해;김창호;임윤철
    • Tribology and Lubricants
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    • v.13 no.4
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    • pp.1-9
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    • 1997
  • ER clutch is a device using ER fluid, so called "intelligent material" and is a power transmission system controlled with electric field strength. In this paper(Part III), the behavior of ER clutch under proper conditions was investigated experimentally and compared to theoretical analyses developed from Part I, II. Considering the optimum design concept proposed from Part I, the concentric cylinder type of ER clutch was designed and the experimental apparatus for the performance test was constructed. The comparisons made indicated that the power transmission model of ER clutch and the temperature rise model of ER fluid developed from Part I, II were acceptable for engineering design calculations.culations.