... soft sediment isope deep-sea miner suspension principle slip ratio baseboard mining symposium sediment miner insertion depth upstream oil & gas traction force proceedings water film metals & mining shear strength mechanism friction strength plastic soil vehicle...

... ABSTRACT Based on the kinematic model of the deep sea tracked miner, a time-optimal control algorithm is proposed. During locomotion, the driving velocity and direction of the vehicle cannot change abruptly, or it will cause excessive slippage of the track. In other words, the vehicle must...

... ABSTRACT: In this paper, dynamic analysis of underwater tracked miner in working condition is done during both straight driving and steering. First, based on the relationship between maximum shear displacement and shear stress, required shear displacement during working of the tracked miner...

... elements. The external hydrodynamic forces from the longitudinal and lateral directions are both considered and modeled based on the Morisson formula and applied to the mass center of each discrete rigid element. The seafloor tracked miner is built as a simplified 3D single-body model with 6 degrees...

... efficiency of the crusts and degradation of the mined ore are examined here in this study under ideal deposit and assumed mining conditions. The economy of the mining venture is also evaluated. cobalt-rich manganese crust yamazaki degradation economic evaluation subsystem miner recovery asset...

.... It appears no new additional issues have yet been identified and solved. Recent discovery of the buried nodules would necessitate a new miner/collector concept. Under the present step-by-step waterdepth approach the realization of a cost-effective commercial deepocean mining system will take much longer than...

... emphasis on the flexible hose with concentrated buoyancy; Several towing motions of track-keeping operation. INTRODUCTION After the lake test of 130-m water depth in 2001, COMRA (China Ocean Mineral Resources R&D Association) plans to carry out a sea trial in 1000-m ocean. The constitution...

... total integrated mining system (TIS) and control (Brink and Chung, 1980): Ship-, pipe-, buffer- and connection- to-miner and miner, and transshipment (Fig. 1). Surface ship system. Very little in the way of new work can be found in recent surface ship system developments, including the heavy-lift...

... been simulated too. INTRODUCTION Connecting the miner to the ship, the configuration, stress and dynamic response of the lift pipe system are significant to the design, control and safety of practical mining system. Chung (1980; 1981; 1994; etc ) has studied the 4000-ft and 18000-ft vertical pipe...

... ABSTRACT: Geotechnical properties of deep-sea sediments which have important roles for design of manganese nodule miner and mining system are presented. They are water content, vane shear strength, sensitivity, cone penetration resistance, cohesion, friction angle, and dynamic moduli...

... for commercialization. More importantly, a decision needs to be made to build on previous achievements and move forward, thus also saving time and funds. This paper follows Chung (1999). *The ISOPE assumes no responsibility for the statements expressed by the author. DEEP-OCEAN MINERALS OF INTEREST Our primary minerals...

... geotechnical investigations. The results indicated that the moveable sediment layer thickness barely surmounts the nodule diameter, that only a fraction of the recent sediment layer will he resuspended and form a cloud, that the near-bottom tailings will be caught by the wake flow of the miner, that most...

... growth and energy and mineral security require faster penetration by new technologies into the markets. One of the roles of the Ocean Mining Working Group (OMWG), a nongovernmental body, can be to act as an informal conduit among the governments. DEEP-OCEAN MINERALS OF INTEREST Our primary minerals...

... ABSTRACT: A large self-propelled seafloor miner or vehicle was tested in the " 70s on the seafloor at a depth of 3,000 to 5,000 m. It was a subsystem of the integrated ship-pipe-buffer-link-miner production system of manganese nodules from the seafloor at that depth. In tracking the set points...

... ABSTRACT: China has begun the project of manganese nodules mining since 1991. Preliminary researches have been carried out by several institutes and universities. Two miners with one hydraulic-mechanic collector and one hydraulic collC1;tor each have been proven to function well. Both...

... for installing and operating a lifting pipe and a miner is studied to reduce down-time. INTRODUCTION The tow method has been widely applied to install offshore pipelines. The basic concept of the tow method is to tow and lay the pipe at an off-shore location after joining and testing the system at an on-shore...

... ABSTRACT: This paper describes some results that CIMR obtained in a study of miner during the first five - year R&D pro. gram of COMRA. The mining system and the miner design principles have been determined. The mechanical- hydraulic collector and caterpillar carrier and miner have...