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An Analytical Method for Positioning Drag Anchors in Seabed Soils
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作者 张炜 刘海笑 +2 位作者 李新仲 李清平 曹静 《China Ocean Engineering》 SCIE EI CSCD 2015年第1期49-64,共16页
Positioning drag anchors in seabed soils are strongly influenced not only by the properties of the anchor and soil, but also by the characteristics of the installation line. The investigation on the previous predictio... Positioning drag anchors in seabed soils are strongly influenced not only by the properties of the anchor and soil, but also by the characteristics of the installation line. The investigation on the previous prediction methods related to anchor positioning demonstrates that the prediction of the anchor position during dragging has inevitably introduced some key and unsubstantiated hypotheses and the applicability of these methods is limited. In the present study, the interactional system between the drag anchor and installation line is firstly introduced for the analysis of anchor positioning. Based on the two mechanical models for embedded lines and drag anchors, the positioning equations for drag anchors have been derived both for cohesive and noncohesive soils. Since the drag angle at the shackle is the most important parameter in the positioning equations, a novel analytical method that can predict both the variation and the exact value of the drag angle at the shackle is proposed. The analytical method for positioning drag anchors which combines the interactional system between the drag anchor and the installation line has provided a reasonable theoretic approach to investigate the anchor behaviors in soils. By comparing with the model flume experiments, the sensitivity, effectiveness and veracity of the positioning method are well verified. 展开更多
关键词 drag anchor anehorpositioning mechanical model drag line embedded line drag angle TRAJECTORY
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Narrowband PLC Channel Workbench to Emulate Transmission in Smart Grid
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作者 Ismail Aouichak Anouar Achouri +1 位作者 Jean-Charles Le Bunetel Yves Raingeaud 《Journal of Control Science and Engineering》 2016年第2期51-60,共10页
A real-time workbench able to reproduce the same behavior as an indoor network is in order. Such a tool will help researchers and industrials extend the smart grid technology indoors and have a better acknowledgment o... A real-time workbench able to reproduce the same behavior as an indoor network is in order. Such a tool will help researchers and industrials extend the smart grid technology indoors and have a better acknowledgment of Smart Grid systems interoperability. In order to develop such a tool many approaches should be studied to choose the most suitable one by comparing the models and the technologies. The considered hardware are the embedded systems and the selected approach is the statistical one. It appears that the FlR filter is the most pertinent approach. 展开更多
关键词 embedded systems emulator power line transfer function modeling FIR (finite impulse response) filters narrowbandPLC (power line communication).
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