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- W2465723652 abstract "In order to reduce the amplitude of longitudinal vibration as well as the axial stress induced in the pipe string, an active control was applied to the mining system. In the proposed system, the string was hung from the mining ship and supported at the upper part with a linear spring, which was connected to the ship through a linear actuator, providing a control displacement for the system. The active control theory (Optimal Regulator Theory) was applied to the system, and the optimal control force for the actuator to provide the control displacement was determined for various cases by minimizing each quadratic performance index. The results indicate that the active-control system could reduce the resonance amplitude of the pipe string by about 80% as compared with that of the mining system without any controls, and that this reduction rate is about 30% greater than that of the passive control system composed of a vibration absorber. Furthermore, the active control could reduce the resonance axial-stress in the pipe string by about 40% as compared with that of the non-controlled mining system, and this rate is about 23% greater than that of the above-mentioned passive control system. However, the control force required for the proposed system is considerably large, so that a proper weighting value for the performance index should be found in future for the system to be applicable." @default.
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- W2465723652 date "1999-01-01" @default.
- W2465723652 modified "2023-09-22" @default.
- W2465723652 title "Active control of longitudinal vibration and axial stress caused in pipe string for mining manganese nodules in deep sea" @default.
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