• Title/Summary/Keyword: double link

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A study on the link composition design of a double link type level luffing jib crane (II) (이중 링크 형식 수평 인입 집 크레인의 링크 구성 설계에 관한 연구(II))

  • Hur, C.W.;Choi, M.S.;Moon, D.H.
    • Journal of Power System Engineering
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    • v.15 no.1
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    • pp.57-63
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    • 2011
  • It is very important to determine link composition of a crane in the basic design of the crane. There are many parameters in the design for the link composition of a double link type level luffing jib crane. We analyze the variation of link composition according to the variation of these parameters which are the angle of fixed link, the angle between the fixed link and backstay when the position of the crane is the maximum working radius, the ratio of fly jib length between two moving hinges to the total length of fly jib, the length of backstay, and the slewing radius. In this paper, we describe the application of the previous analysis program of the link composition design for a double link type level luffing jib crane.

Static and Structural Analyses of the Link of a Double-Action Link-Type Hydraulic Die Set (폐쇄단조용 복동링크유압식 다이세트의 링크의 정역학적 해석과 구조해석)

  • Eom J.G.;Jun B.Y.;Joun M.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.93-94
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    • 2006
  • This paper presents the mechanics of the link of a double-action link-type hydraulic die set for the enclosed die forging. The force exerted on the link is statically investigated and its structural analysis is carried out.

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Development of a Double-Action Link-Type Hydraulic Die Set for Enclosed Die Forging (폐쇄단조용 복동링크유압식 다이세트의 개발)

  • Choi, S.H.;Jun, B.Y.;Lee, M.C.;Park, R.H.;Eom, J.G.;Joun, M.S.
    • Transactions of Materials Processing
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    • v.15 no.5 s.86
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    • pp.373-381
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    • 2006
  • The key technologies necessary to develop and utilize a double-action link-type hydraulic die set for the enclosed die forging are presented in this paper. Various die sets for the enclosed die forging are investigated and the technologies necessary to develop and to utilize a double-action link-type hydraulic die set are introduced in detail with emphasis on the mechanism of the die set and its kinematical behaviors, the force transmission mechanism, the criterion on the enclosed die forging and its application, the forming load prediction and the stress distribution of the link. A double-action link-type hydraulic die set is developed and it is applied to the enclosed die forging of a bevel gear.

ON THE REALIZATION OF THE DOUBLE LINK AS A BRANCHED SET

  • Kim, Yang-Kok
    • East Asian mathematical journal
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    • v.17 no.2
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    • pp.239-251
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    • 2001
  • We construct a family of 3-manifolds by pairwise identifications of faces in the boundary of certain polyhedral3-balls and prove that all these manifolds are cyclic branched coverings of the 3-sphere over the double link.

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Static and Structural Analyses of the Link of a Double-Action Link-Type Hydraulic Die Set (폐쇄단조용 복동링크유압식 다이세트의 링크의 정역학적 해석과 구조해석)

  • Eom, Jae-Gun;Jun, Byoung-Yoon;Joun, Man-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.10
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    • pp.96-102
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    • 2006
  • This paper presents the mechanics of the link of a double-action link-type hydraulic die set for the enclosed die forging. Operational principle of the die set in the enclosed die forging is introduced with emphasis on force transmission from the press and the hydraulic system to the material through links, die components and punches. The force exerted on the link is statically investigated and its structural analysis is carried out. The analyzed results are discussed to be used for design of the link system.

An Improved Shared-Path Protection Algorithm for Double-Link Failures in Meshed WDM Optical Networks

  • Wang, Xingwei;Guo, Lei;Li, Lemin;Wei, Xuetao
    • Journal of Communications and Networks
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    • v.10 no.3
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    • pp.331-337
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    • 2008
  • In this paper, we investigate survivability in wavelength division multiplexing (WDM) mesh networks and propose a new algorithm called improved shared-path protection (ISPP) to completely tolerate the double-link failures. Compared with previous algorithms for protecting double-link failures, i.e., shared-path protection (SPP) and shared-link protection (SLP), the advantage of ISPP is to allow primary paths and backup paths to share the mixed wavelength-links based on the proposed new rules in which some primary wavelength-links can be changed to mixed wavelength-links, which can be shared by primary paths and backup paths. In addition, some mixed wavelength-links also can be shared by different backup paths for saving resources. Simulation results show that ISPP algorithm performs better in resource utilization ratio and blocking probability than conventional SPP and SLP algorithms.

The Attitude Control of The Double Inverted Pendulum with Periodic Upper Disturbance (주기적인 상부 외란이 인가되는 2축 도립 진자의 자세 제어)

  • Nam, Row-Hyun;Yi, Keon-Young
    • Proceedings of the KIEE Conference
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    • 1998.07g
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    • pp.2309-2311
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    • 1998
  • The attitude control of a double inverted pendulum with a periodical disturbance at link top is dealt in this paper. The proposed system is consisted of the double inverted pendulum and a disturbance link. The lower link is hinged on the plate to free for rotation in the vertical plane. The upper link is connected to the lower link through a DC motor. The DC motor is used to control the posture of the pendulum by adjusting the position of the upper link. The periodical disturbance can be generated by the additional link attached at the end of link 2 through another DC motor, which is the modeling of a posture for a biped supporting with one leg. The motor for the joint simulates the knee joint(or hip joint) and the disturbance for the legs moving in air. The algorithm for controlling a proposed inverted pendulum is consisted of a state feedback control and a fuzzy logic controller. The fuzzy controller keeps the center of gravity of the biped within the specified range through the nonlinear feedback compensator. The state feedback control takes over the role to maintain a desired posture regardless the disturbance at the link top. In these case, the change of the angle and COG of an upper link is compensated with on-line. Simulations with a mathematical model are conducted to show the validity of the proposed controller.

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Criterion on Enclosed Die Forging with a Double-Action Link-Type Hydraulic Die Set (복동링크유압식 다이세트를 이용한 폐쇄단조의 폐쇄단조조건)

  • Jun, B.Y.;Park, R.H.;Eom, J.G.;Joun, M.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.391-394
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    • 2006
  • In this paper, a criterion on enclosed die forging with a double action link type hydraulic die set is presented. Operational principle of the die set in enclosed die forging is introduced with emphasis on force transfer from the press and the hydraulic system to the material through links, die components and punches. Force transfer mechanism is examined and three different modes are introduced. Requirements on force equilibrium are applied to the three force transfer modes and a criterion on enclosed die forging with a double action link type hydraulic die set is drawn. The criterion is discussed to minimize forming load.

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Position Control of the Two Links Inverted Pendulum with a Time Varying Load on the Top (상부 시변 부하를 갖는 2축 도립진자의 위치 제어)

  • 이건영
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.9
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    • pp.1147-1153
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    • 1999
  • The attitude control of a double inverted pendulum with a periodical disturbance at link top is dealt in this paper. The proposed system is consisted of the double inverted pendulum and a disturbing link; a triple inverted pendulum with two motors. The lower link is hinged on the plate to free for rotation in the vertical plane. The upper link is connected to the lower link through a DC motor. The DC motor is used to control the posture of the pendulum by adjusting the position of the upper link. The periodical disturbance can be generated by the additional like attached at the end of link 2 through another DC motor, which is the modeling of a posture for a biped supporting with one leg. The motor for the joint simulates the knee joint(or hip joint) and the disturbance for the legs moving in air. The algorithm for controlling the proposed inverted pendulum which is regarded as a virtual double inverted pendulum with a periodic disturbance, is consisted of a state feedback control and a fuzzy logic controller connected in parallel. The fuzzy controller keeps the center of gravity of the biped within the specified range through the nonlinear feedback compensator. The state feedback control takes over the role to maintain a desired posture regardless the disturbance at the link top. Simulations with a mathematical model and experiments are conducted to show the validity of the proposed controller.

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A Study on the Link Composition Design of a Double Link Type Level Luffing Jib Crane (I) (이중 링크 형식 수평 인입 집 크레인의 링크 구성 설계에 관한 연구( I ))

  • Moon, D.H.;Hur, C.W.;Choi, M.S.
    • Journal of Power System Engineering
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    • v.13 no.1
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    • pp.19-25
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    • 2009
  • This paper is a study on the link composition design of a double link type level luffing jib crane using path generation synthesis passing through three precision points according to parameters, the length of backstay, the ratio of fly jib length between two moving hinges to the total length of fly jib, the location of a intermediate passing point etc. when the maximum and minimum working radius of the crane are given. The performance of the crane depends on the deviation of the luffing trajectory at fly jib tip. The luffing trajectories according to the above parameters are analyzed and shown in graphs by the developed computer program. In a real-life design, some trials are needed to arrive at a proper link composition design. Therefore, it is expected that the present computer program can rapidly and exactly deal with a link composition design proper to the design criteria of the crane.

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