In this study, the performance of Circulating Water Channel (CWC) is investigated in the research field of ship maneuverability. This paper introduces an analysis method of Planar Motion Mechanism (PMM) test in CWC. A difference is indicated in the analysis method when using a towing tank and CWC for pure yaw PMM test. The hydrodynamic derivatives obtained by PMM test in CWC agree well with those in towing tank when using the analysis method presented. PMM tests in CWC are useful for course stability investigation of full hull ships using the hydrodynamic derivatives obtained.
West Japan Fluid Engineering Laboratory Co.,Ltd., Japan
Graduate School of Engineering, Hiroshima University, Japan
Straits is narrowing of the sea lanes between the islands induce to the current speed which is higher than the surrounding. In the manner of the high current speed, kinetic energy can be generated by utilizing marine current turbine. In this case, each water column has different tidal velocity. Therefore, the evaluation of current potency is needed by Average Power Density (APD) to determine the type of tidal technology with optimum power output. It is based on efficiency and environmental condition. Efficiency is one of the basic of vertical axis turbine (VACT) selection with floating system, cascade configuration and pitch variable at 4 meter below sea level. In this paper, Analytical Hierarchy Process (AHP) is chosen as a method to support the convenient technology which can be applied in the Strait of Toyapakeh, Nusa Penida, Bali.
Marine Engineering, Institut Teknologi Sepuluh Nopember, Indonesia
Ministry of Energy and Mineral Resource of Republic Indonesia
The weight of a conventional flexible pipe poses a major challenge for installations when reaching significant water depths which makes composite material an ideal alternative for steel in the armor layers. In light of this matter, a woven configuration was developed for the armor layer utilizing glass epoxy, namely the woven flexible pipe. However, the performance of the woven flexible pipe in deep water conditions are unknown, thus the need of a numerical analysis. In this paper, an initial comparison was conducted for the woven flexible pipe with a typical bonded flexible pipe called the thermoplastic reinforced pipe where one layer of the woven flexible pipe is considered to show its performance. The results show higher stress experienced by the woven flexible pipe compared to the reinforced thermoplastic pipe. It is hoped that the results of this research will contribute to future studies of flexible pipelines.
Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia
Department of Mechanical Engineering, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia
In this paper, PVDF/PMMA membrane was successfully prepared by using salicylic acid as a foaming agent to produce porous structure within the polymer blend matrix. Ionic liquid - salt mixtures of 1-ethyl-3 methyl imidazolium triflouromethanysulfonyl imide and lithium bis-triflouromethylsulfonyl imide were used to activate the PVDF/PMMA membrane. The as-prepared PVDF/PMMA membrane contains pores when observed from scanning electron microscope, which leads to the high ionic-liquid electrolyte uptake. The PVDF/PMMA gel polymer electrolyte exhibited a high ionic conductivity of 3.097 mS cm-1 at room temperature with high lithium ion transference number (0.7922) and wide electrochemical stability window (4.3 V). Its electrochemical performance was evaluated by LiFePO4 half-cell, suggesting that this ionic-liquid gel polymer electrolyte is possible to be developed as an electrolyte in lithium rechargeable battery.
School of Ocean Engineering, Universiti Malaysia Terengganu, Terengganu, Malaysia
In this study, the hydrogen storage properties and reaction mechanisms of the destabilized system MgH2-LiAlH4 by adding with TiO2 were investigated. The sample was prepared in glove box under argon atmosphere and used ball milling technique to mix the MgH2 and LiAlH4 powder in ratio of 4:1 with 10 wt.% of TiO2 for 1 hour. Sample of non-catalyzed composite was prepared as well for comparison purpose. In the first two stages of dehydrogenation stage, the onset desorption temperature of 4MgH2-LiAlH4 composite doped with 10 wt.% TiO2 reduced 100 ºC and 270 ºC of non-catalyzed composite to 70 ºC and 200 ºC, respectively, in which shown by the temperature-programmed-desorption curves from pressure-composition-temperature. It was found that the dehydrogenation and re-hydrogenation kinetics of this catalyzed composite were also improved compare to non-catalyzed composite. X-ray diffraction analysis shows the formation of new phases, which are AlTi3 and TiH1.5 in the catalyzed composite after dehydrogenation process at 320 ºC. It was believed that these two new phases can be act as the actual catalyst in 4MgH2-LiAlH4-TiO2 composite, which will promote the interaction between MgH2 and LiAlH4 along with reduce the desorption temperature. In conclusion, the hydrogen storage properties and reaction mechanisms of 4MgH2-LiAlH4 composite were improved by the addition of TiO2 catalyst.
School of Ocean Engineering, Universiti Malaysia Terengganu, Terengganu, Malaysia
Wake oscillator model is considered a semi-empirical model that is most suitable for qualitative or quantitative evaluation of Vortex-Induced Vibration (VIV) structure in the design stage. This paper focuses on further development of a previously published semi-empirical method of wake oscillator model for VIV and aims to derive a mathematical relationship qualitatively and quantitatively in modelling all features of VIV phenomenon. Analytical solutions of semi-empirical model are proposed for coupled wake oscillator model and structure oscillator model based on the Van der Pol equation. The present coupled model results are evaluated analytically and show qualitative and quantitative agreement with both analytical and experimental data from literature.
School of Ocean Engineering, Universiti Malaysia Terengganu, Terengganu, Malaysia
School of Informatics and Applied Mathematics, Universiti Malaysia Terengganu, Terengganu, Malaysia
Malaysian government introduced Small Renewable Energy Power (SREP) Program in 2001. In this paper, it discussed the possibility to utilize ocean wave in Merang shore, Terengganu, Malaysia. Besides, this paper also discusses the current technologies have been used to convert wave energy to electricity. The work principle of the devices also present in this paper. After that, sea condition in Malaysia was explored to study the possibility of utilization of wave energy in Malaysia. Finally, It is found Merang shore is the idea location to utilize the wave energy in Malaysia. Mean wave height and mean wave period at the location are 0.95 meter and 3.5 second. Also, attenuator type wave converter developed by Wave Star was considered as one of the possible devices to install at the location. From the calculation, the research obtained that the total rate of electrical power possible to grid is 649 MWh a year if only one set of C5 Wave star device install at Merang shore, Terengganu.
Department of Aeronautic, Automotive and Ocean Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
The management of laboratory/workshop equipment is crucial to achieve the optimization of system accessibility, accuracy, timeliness, and sustainability. The information system for the laboratory management is an information provider that supports decision-making processes and deployment of data sources. This paper aims to design and analyze a system scheduling information of laboratory/workshop equipment. The research method consists of two stages: (1) analyzes previously the scheduling management system of laboratory equipment and design a new improving its system. The method used flow system of arrival pattern, which the job priority rules First Come First Served (FCFS). The stages 2 were a design of scheduling equipment management system for the laboratory/workshop based computerized. The design of the information system was used program language of the PHP (Hypertext Pre-processor) and MySQL (My Structure Query Language) as a database. This system design was integrated between admin and users (students, technicians and lecturers). This research advantages were generated an information application system design to manage the scheduling data of laboratory equipment. Hence, it can facilitate the management laboratory/workshop to determine operational labor in a much easier manner yielding more accurate and faster results.
Mechanical Engineering, Universitas Riau, Indonesia
The innovative design of a coconut machine can overcome the problems of manually process of a coconut de-husking. This paper objective is to design a coconut de-husking machine based coconut farming community needs. The design used method of the Quality Function Deployment (QFD) to develop a machine that suits to coconut farmers. The steps of the proposed method were to translate customer needs into coconut de-husking machine characteristics, parts of machine characteristics and development of coconut de-husking machine. The machine design for a coconut de-husking employed an electric motor, which it was connected to the roller. Then, the blades on the roller have been embedded and peeled the coconut husk. This research produced a design and development of a coconut de-husking machine based voice of customer approach and customer needs as a support in the design of the machine. Therefore, the development of machine may fulfill coconut farming community needs to overcome conventional process of coconut de-husking.
Mechanical Engineering, Universitas Riau, Indonesia
Industrial Engineering, Universitas Muhammadiyah Riau, Indonesia
