• Title/Summary/Keyword: coupling device

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A study of the kinematic characteristic of a coupling device between the buffer system and the flexible pipe of a deep-seabed mining system

  • Oh, Jae-Won;Lee, Chang-Ho;Hong, Sup;Bae, Dae-Sung;Cho, Hui-Je;Kim, Hyung-Woo
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.6 no.3
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    • pp.652-669
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    • 2014
  • This paper concerns the kinematic characteristics of a coupling device in a deep-seabed mining system. This coupling device connects the buffer system and the flexible pipe. The motion of the buffer system, flexible pipe and mining robot are affected by the coupling device. So the coupling device should be considered as a major factor when this device is designed. Therefore, we find a stable kinematic device, and apply it to the design coupling device through this study. The kinematic characteristics of the coupling device are analyzed by multi-body dynamics simulation method, and finite element method. The dynamic analysis model was built in the commercial software DAFUL. The Fluid Structure Interaction (FSI) method is applied to build the deep-seabed environment. Hydrodynamic force and moment are applied in the dynamic model for the FSI method. The loads and deformation of flexible pipe are estimated for analysis results of the kinematic characteristics.

Toward Transparent Virtual Coupling for Haptic Interaction during Contact Tasks (컨택트 작업 시 햅틱 인터렉션의 투명성 향상을 위한 Virtual Coupling 기법의 설계)

  • Kim, Myungsin;Lee, Dongjun
    • The Journal of Korea Robotics Society
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    • v.8 no.3
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    • pp.186-196
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    • 2013
  • Since its introduction (e.g., [4, 6]), virtual coupling technique has been de facto way to connect a haptic device with a virtual proxy for haptic rendering and control. However, because of the single dependence on spring-damper feedback action, this virtual coupling suffers from the degraded transparency particularly during contact tasks when large device/proxy-forces are involved. In this paper, we propose a novel virtual coupling technique, which, by utilizing passive decomposition, reduces device-proxy position deviation even during the contact tasks while also scaling down (or up) the apparent inertia of the coordinated device-proxy. By doing so, we can significantly improve transparency between multiple degree of freedom (possibly nonlinear) haptic device and virtual proxy. In other to use passive decomposition, disturbance observer of [3] is adopted to estimate human force with some dead-zone modification to avoid "winding-up" force estimation in the presence of device torque saturation. Some preliminary experimental results are also given to illustrate efficacy of the proposed technique.

Development of Automatic Operating :System for the Sea Eel Pots Fisheries(I) - Coupling Device for Sea Eel Pot and Separating System - (장어 통발어선의 자동화 조업장치 개발에 관한 연구(I) -통발연결장치.분리장치-)

  • 정용길;김용해;유금범
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.36 no.2
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    • pp.126-131
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    • 2000
  • Capability and performance of the pliers type coupling device for connection of sea eel pots to loop of main line and automatic separating system were investigated at sea as first trial of developing automatic operating system for sea eel pot fishing boat. Obtained main results are as follows. 1. Maximum tensile load of the pliers type coupling device when connection with high twist PP dan-line as a loop of main line was 1603 N, higher than when connection with low twist PP twine 1379 N. 2. A retention ratio of sea eel pots from main line by connecting with coupling device was successful 100% with high performance without any loss in the sea. 3. A ratio of automatic disconnection between sea eel pots using coupling device and loop of main line was perfect 100% without any trouble.

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Polymeric digital optical switch with a coupling region modified for optimum mode coupling (모드 결합을 최적화 하기 위해 수정된 결합 영역을 갖는 전기광학 폴리머 디지탈 광스위치)

  • 이상신;신상영
    • Korean Journal of Optics and Photonics
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    • v.8 no.3
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    • pp.245-249
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    • 1997
  • An electro-optic polymer digital optical switch with a coupling region modified for optimum coupling is designed and demonstrated. Its branch waveguide is fabricated by reactive ion etching. Then, the modified coupling region is adiabatically introduced along the propagation direction from the branching point of the two waveguides, and it is implemented by photobleaching after the device fabrication. The structure of the modified coupling region and its refractive index profiles are designed to optimize and mode coupling in the Y-branch waveguide. Therefore, the switching performance of the device was shown to be enhanced with a fixed device length. The measured drive voltage is reduced by more than 30 percents, and the crosstalk is also improved by about 4~6 dB.

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Analysis of electro-optic polymer digital optical switch with a coupling region modified for optimum mode coupling (최적의 모드 결합을 얻기 위해 수정된 결합 영역을 갖는 전기광학 폴리머 디지탈 광스위치의 해석)

  • 이상신;신상영
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.34D no.4
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    • pp.87-93
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    • 1997
  • An electro-optic polymer digital optical switch with a coupling region modified for optimum mode coupling is proposed, and it is analyzed by using the beam propagation method combined with the effective index method. Its modified coupling region is adiabatically introduced along the propagation direction from the branching point of the two waveguides. The structure of the modified coupling region and its refractive index profiles are designed to optimize the mode coupling in the Y-branch waveguide. Therefor, the switching performance of the device may be enhanced with a fixed device length. It is confirmed from the numerical calculation that the drive voltage is reduced by more than 30 percents and te crosstalk is improved by about 8dB.

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Low-loss Electrically Controllable Vertical Directional Couplers

  • Tran, Thang Q.;Kim, Sangin
    • Current Optics and Photonics
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    • v.1 no.1
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    • pp.65-72
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    • 2017
  • We propose a nearly lossless, compact, electrically modulated vertical directional coupler, which is based on the controllable evanescent coupling in a previously proposed graphene-assisted total internal reflection (GA-FTIR) scheme. In the proposed device, two single-mode waveguides are separate by graphene-$SiO_2$-graphene layers. By changing the chemical potential of the graphene layers with a gate voltage, the coupling strength between the waveguides, and hence the coupling length of the directional coupler, is controlled. Therefore, for a properly chosen, fixed device length, when an input wave is launched into one of the waveguides, the ratio of their output powers can be controlled electrically. The operation of the proposed device is analyzed, with the dispersion relations calculated using a model of a one-dimensional slab waveguide. The supermodes in the coupled waveguide are calculated using the finite-element method to estimate the coupling length, realistic devices are designed, and their performance was confirmed using the finite-difference time-domain method. The designed $3{\mu}m$ by $1{\mu}m$ device achieves an insertion loss of less than 0.11 dB, and a 24-dB extinction ratio between bar and cross states. The proposed low-loss device could enable integrated modulation of a strong optical signal, without thermal buildup.

The characteristics and optimal modeling of input source for optical device using thin film filter in optical telecommunication network (광통신용 박막필터형 광소자 분석을 위한 최적화 모델링과 특성분석)

  • 김명진;이승걸
    • Korean Journal of Optics and Photonics
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    • v.14 no.3
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    • pp.306-311
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    • 2003
  • In this paper, we modeled the incident beam in order to analyze and evaluate the optical thin film device for wavelength division multiplexing in optical telecommunication network. As applied ray tracing method to the optical path, we were compared the accuracy of coupling efficiency simulated by two modeling methods. In the results of sinulation, ceil modeling method was preferred to annual modeling method in micro-optic device because of accuracy for coupling efficiency and Gaussian intensity distribution. In the results of optimal simulation for optical device using thin film filter, the distance (d1) between optical fiber and GRIN lens, the distance (d2) between GRIN lens and thin film filter and the coupling efficiency were 0.24 mm, 0.25 mm and -0.11 ㏈ respectively. As d2 was displaced at 0.25 mm and d1 was varied in order to evaluate the optimal value, d1 and maximum coupling efficiency were 0.24 mm and -0.35㏈, respectively. Then the results of experiment were corresponded to that of optimal simulation by cell modeling and it was possible to analyze the performance for optical device using thin film filter by the simulation.

Device Miniaturization Using Stepped Multimode-Interference Couplers (계단형 다중모드 간섭 결합기를 사용한 소자의 소형화)

  • Ho, Kwang-Chun
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.47 no.1
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    • pp.14-19
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    • 2010
  • In this paper, a novel architecture for device miniaturization of multimode interference-based couplers (MMICs) is proposed by replacing conventionally designed MMICs by cascaded two-section stepped-width or stepped-index MMICs. For the 82% cross coupling efficiency in a stepped-width MMIC, the coupling length of device results in just 6.7% length reduction. However, for a stepped-width and stepped-index MMIC, the coupling efficiency increases to 93% and the length reduction of 9% occurs. Furthermore, with additional incorporation of tapered devices, it shows that a compact MMIC can be designed in which the coupling efficiency is 90% and the length is reduced to 25%.

Maximum Optical Coupling Point Search Algorithm for Manufacturing of Optical Device (광전소자 제조를 위한 최대 광 결합점 검색 알고리즘)

  • 한일호;김회율
    • Proceedings of the IEEK Conference
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    • 2001.06e
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    • pp.9-12
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    • 2001
  • Optical aligning process to archive the maximum optical coupling is crucial in many optical device manufacturing line such as laser diode module. Due to the three-dimensional nature of housing module and the aligning process for laser diode coupler, large amount of the manufacturing time, typically ranging from tens of minutes to an hour has to be devoted to the aligning process alone. In this thesis, we propose a new optical aligning process that employee a two-pass algorithm: coarse-to-fine search. Coarse search is a kind of blind search that finds the candidate region where the maximum optical coupling might mostly occur, followed by a fine searching that finds the maximum within the candidate region. The algorithm has been tested on 50 samples of cam-type laser diode modules, and the experimental results are analyzed in terms of aligning time and coupling efficiency.

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