Recent advancements in miniature hardware technologies pushed the development of unmanned underwater vehicles (UUVs) towards more innovative designs to cater for unique mission definitions. Considering the recent 10 years of work done by various researchers in the literatures, presented in this paper is an overview of several state of the art technologies involved in the development of UUVs. Design studies are presented, whereby divided into various aspects including structure/hull shapes, propulsion, and motion/hydrodynamics. Emphases are given to the selection of shapes/geometry and the materials used. The advantages and the disadvantages of the components were discussed with respect to hydrodynamic forces acting on the UUVs such as resistance, stability, and motion. In terms of propulsion aspects of the UUVs, the discussions are focused on the related components used and the energy supply on-board of the UUVs.
School of Ocean Engineering, Universiti Malaysia Terengganu, Terengganu, Malaysia.
School of Electrical and Electronic Engineering, Universiti Sains Malaysia, Pulau Pinang, Malaysia.
This research described a study of recurrence motion on a volume submersible. Recurrence is the phenomenon in which a system of quasi-periodically returns to its initial conditions after undergoing some degree of evolution, this finding supports the theory of quasi determinism (QD) of sea waves. The research to determine recurrence characteristic of motion in the large volume of semisubmersible using computational methods of ANSYS® AQWA™. The motion was analyzed four types of different incident waves by using JONSWAP Spectrum and are generally regarded as a pure randomness in nature which interacts with the structure generating hydrodynamic motion. Responses of motion were performed for 3 hours, in which it was divided into 9 seed for each incident wave. Hs 7 meters Tp 12.7 sec, Hs and 7 meters Tp 13.5 sec, Hs 8 meters and Tp 12.7 sec, and Hs 8 meters and Tp 12.7 sec , recurrence occurred in the interval (to +635s, to +879) - (to+1774, +to2074), (to +1460, to+1635) - (to +5758, to +5933), (to +693, to+882) - ( to+1735, to+1924) and (to +792, to+992) - (to+1938, to+2138), respectively. Recurrence motion on a large volume semisubmersible support the to support the quasi determinism (QD) theory.
Fakultas Ilmu Kelautan and Perikanan, Universitas Maritim Raja Ali Haji, Indonesia
Department of Aeronautics, Automotive and Ocean Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
This paper is to study the effect of arc welding amperage variation on the mechanical properties by using shielded metal arc welding (SMAW) E 6013 to the joint of metal that comply with ASTM E23. In the welding joint zone is always to be concern due to fusion and heating treatment that cause the change of material properties after welding process. In order to ensure the toughness of weld joint material, so tensile and charpy test are conducted to observe the properties of weld joint material. The charpy V-notch impact indicate the increasing of heat input lead to be more brittle in the weld zone.
Mechanical Technology Laboratory, Mechanical Engineering, Universitas Riau, Indonesia.
Mechanical Engineering, Sekolah Tinggi Teknologi Pekanbaru, Riau, Indonesia.
Ocean and Aerospace Research Institute, Indonesia.
