ABSTRACT:

Axiomatic design is adopted for conceptual evaluation of design of Deepsea Manganese Nodule Miner (DSNM). Interactions between functional requirements and design variables for DSNM are analyzed hierarchically. Design of DSNM is treated as a composition of various kinds of levels of Functional Requirements (FRs) and Design Parameters (DPs). Design matrices showing the dependence and/or independence between FRs and DPs are formed and analyzed for all levels. The results show that the design of DSNM is not a coupled one, but a decoupled. Finally, it is conceptually verified that DSNM is a good design satisfying the independence axiom of the axiomatic design.

INTRODUCTION

To develop a mining system of deepsea mineral resources such as manganese nodules is a challenging task in ocean engineering. Mining system is composed of miner, lifting system and surface unit. In this study design of miner system is conceptually evaluated in the viewpoint of axiomatic design Chung (2003) reviewed the state of technological development of deepsea mining. He analyzed a deepsea manganese nodule miner (DSNM) classified in Remote-Controlled Miner (RCM) system and Tow-Sled (TS) system (Chung 1996). In 1970's RCM had been tested in the Pacific Ocean with Glomar Explorer by OMCO-Lockheed consortium (Chung 1996). In 1976/78, OMCO-Lockheed consortium performed the deepsea mining test with archimedean screw type vehicle at 4877m water depth (Chung 1999, Chung personal communication). It was followed recently by India and China. India conducted the maneuvering control test on the 410m deep seafloor in Indian Ocean (Deepak 2001). China tested COMRA's miner in an inland lake in 2001 (Gong 2002). In 1970"s, TS system was tested by the international consortium, OMI. A design concept of RCM was chosen, which is composed of hybrid nodule pickup system, tracked vehicle and flexible conduit transporting nodules to a buffer (Hong et al. 1997, 1999).

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