... ABSTRACT This paper presents a new method for transverse and longitudinal vibration monitoring of ship propulsion shafting based on three-axis acceleration sensor. The acceleration sensor is directly placed on the shaft, and the signal is transmitted wirelessly. In addition, to verify...

... 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...

... ABSTRACT In order to reduce the axial stress produced in the pipe string, multi-stepped pipe strings are taken into consideration. Then, their longitudinal vibrations as well as axial stresses caused by the ship's heave-motion are theoretically analyzed. The results obtained are compared...

...; Reed, 1961) and now it is well established. However, the condition for an absorber used in water has not been found yet in any publications. Using an absorber, the authors (Aso et aI., I 992, 1994a, 1994b, 1995) have studied the longitudinal vibration-control of the pipe string for mining manganese...

...Proceedings of the Seventh (1997) International Offshore and Polar Engineering Conference Honolulu, USA, May 25-30, 1997 Copyright © 1997 by The International Society of Offshore and Polar Engineers ISBN 1-880653-28-1 (Set); ISBN 1-880653-29-X (VoL I) Longitudinal Vibration-Control of Pipe String...

... ABSTRACT In order to reduce the axial stress produced in the pipe string for mining manganese nodules, a threestepped pipe string with larger diameter in the upper part was taken into consideration and its longitudinal vibration caused by the ship's heaving motion was analyzed in case...

... 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...

... ABSTRACT In order to control the longitudinal vibration of the pipe string in the deep ocean mining system, first, the possibility of an active control system was examined, but the active control was found to be hardly " applicable for that purpose, because It required a large amount of power...

... 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...