...-ocean mining system and technology of automatic ship-pipe-buffer-link-control with a self-propelled, automatic track-keeping miner or mining vehicle. The commercial mining system incorporates more recent computer-controlled automatic position or track-keeping control operation simulations, as well...

... in the aspect of environment. This paper presents fundamental results of scaled model test conducted for the purpose of technological feasibility study on skip-lifting system. Main measurement factors are system configuration, angular response and horizontal acceleration of buffer station. It will provide...

... structures is investigated. For a low density and large diameter riser, such as HDPE pipe, with a buffer, it is found that the total added mass of a riser is so large that a buffer attached at the low end of a riser does not affect the behaviour of a riser. The basic dynamic behaviour properties of a GFRP...

... buffer matrix coordinate frame error dynamic A Coastline Following Preview Controller for the DELFIMx Vehicle Pedro Gomes , Carlos Silvestre , Antonio Pascoal , Rita Cunha Institute for Systems and Robotics Instituto Superior Tecnico Lisboa, Portugal 1ABSTRACT This paper describes...

... ABSTRACT The deep seabed mining system is generally composed of surface vessel, lifting system, buffer, flexible pipe and miner. The mining system is regarded as a large-scale system in which each subsystem is interconnected to other ones. In order to control a large-scale system...

... Control for the Buffer of a Deep-Sea Mining System Using FIR Filter Ki H. Kim, Hang S. Choi, Woo J. Seong and Kyu Y. Lee Seoul National University Seoul, Korea ABSTRACT This paper describes a control algorithm for the buffer of a deep- sea mining system, in which the buffer is connected to a long slender...

... ABSTRACT The present entire pipe system consists of a very long vertical pipe with elastic joints, pin-joining the buffer (mass) at the pipe's bottom end to a much shorter horizontal pipe. The opposite end of the horizontal pipe is pin-joined to a vehicle maneuvering in the planar (x, y...

... ABSTRACT The present entire pipe system consists of a very long vertical pipe with elastic joints, pin-joining the buffer (mass) at its bottom end to a much shorter horizontal pipe. Opposite end of the horizontal pipe is pin-joined to a vehicle maneuvering on the seafloor, and it can...

... the nodules up to the ship, and with a buffer for regulating the density of nodule-fluid mixture in the pipe string and for stabilizing the mechamcal behavior of the string. The pipe string in this system is apt to vibrate longitudinally, laterally and torsionally due to the ship motions control unit...

..., a pipe string is needed to connect the mining ship on the sea surface with a miner on the sea floor, as shown in Fig. 1. Furthermore, the string must be equipped with one or more pump modules and a buffer in case of the pump-lift system. However, the string is easy to vibrate longitudinally, laterally...

... and Chung et al. (1980–1997). cheng mse chung prediction upstream oil & gas vibration stiffness loading function buffer pipe system fem fem prediction thrust vector joint property biaxial pipe 3 deflection elastic joint pipe amplitude Proceedings of the Eighth (1998...

... or nonlinear spring at its upper part. Furthermore. a vibration absorber was attached to the buffer at the lower end of the pipe string as a complemen- tary measure for this purpose. The analyses of the longitudinal vibration and stress produced in the pipe string for this system show that the linear-spring...

...), and it must be reduced as much as possible. Up to the present, Aso et al. (1991a, 1993) have studied the shape-effect of the buffer on the longitudinal vibration of the pipe string, identifying that the buffer whose shape causes a higher drag force more reduces the vibration. frequency vibration...

... ABSTRACT: In order to reduce the longitudinal vibration of the pipe string for mining manganese nodules from deep sea bottoms, the effects of vibration absorbers with linear springs were studied in the previous reports, indicating that the resonance amplitude of the buffer attached...

... and that it is far easier to find suitable locations off-shore. renewable energy sea bed structure cable wire force anchor line buffer hanstholm harbour wave power converter seabed structure water level variation ocean energy hydraulic power proceedings social responsibility single survival...

... which was difficult to obtain on the ship as well as on the pipe string. Then, the semi-active control was studied, and it was found that the resonance amplitude of the buffer could be reduced to less than the amplitude by the ordinary vibration-absorber attached to the buffer if the spring constant...

... Manganese Nodules by the Shape of Buffer K. Aso. K. Kun. H. Do/"i. T Ohkoshl und T Na/on Akita University Akita. Japan ABSTRACT In order to reduce the longitudinal vibration of pIpe string for mining manganese nodules by the pump- lift system, first, various buffers were designed to cause higher drag-forces...

... ABSTRACT In order to reduce the longitudinal vibration of the pipe string for mining manganese nodules in the deep sea, a vibration absorber, which was composed of a mass, springs and dampers, was attached to the pump modules as well as the buffer. Then, the effect of the absorber...

... ABSTRACT: In order to reduce the longitudinal vibration of the pipe string in the deep ocean mining system, a vibration absorber, which was composed of a mass, springs and dampers, was attached to the pump module as well as the buffer. Then, the effect of the absorber on the vibration...