Feasibility Study of Monsoon Effect on Wave Power for Wave Energy Converter in Sabah, Malaysia

This paper presents a research to determine the effects of the Northeast Monsoon (NEM) and the Southwest Monsoon (SWM) on wave power along the coastal area of Mandi Darah Island, Sabah. This study identified the daily data of wave height and wave period for 6 months from June to December 2018. The following period was chosen because it consisted of two monsoon seasons in Sabah. The data obtained from the Acoustic Doppler Current Profiler (ADCP) were thoroughly analyzed to estimate the wave height and the wave period to identify the wave power at Mandi Darah Island. The wave heights ranged from 0.01 m to 0.47 m while the wave periods ranged from 1.0 s to 8.6 s. The wave height range during the NEM was higher by 0.12 m than SWM, while the difference of wave period was significantly higher by 2.17 s during the NEM. The maximum wave power recorded at Mandi Darah Island was 1.57 kW/m throughout the period. During NEM, the wave power was significantly higher than during SWM, by 0.70 kW/m. These findings led to determining the wave energy type converter that suits the wave conditions at the Mandi Darah Island coastal area

Viability study on the application of advance blasting method in Malaysian shipbuilding industry

The main objective of study is to propose application of advance blasting method in Malaysian shipbuilding industry; therefore it is hypothesis by replacing the current method with advance method would be more technically and economically beneficial. From the preliminary survey to the Malaysian shipbuilding or ship repair industry, the abrasive blasting methods are still being implemented for surface preparation. This technology, although effective in coating removal and establishment of surface profile, is laden with inherent problems, American and European yards began realizing the human and environmental consequences of open air abrasive blasting. To overcome such problem, the advanced method of ultra high pressure water jetting is used. However, this advanced ultra high pressure water jetting method is still not been implemented in Malaysian shipbuilding industry. With this back ground, a viability study was carrying out on the application advance blasting method to the local shipbuilding. The study focused on technical and economical aspects and comparison here made among several advance methods and against the present abrasive blasting method. The result of the study indicated that, a. Technically, automated ultra high pressure water jetting is the best blasting method with the cleaning capability of 90 m2 per hour (12 times faster than abrasive blasting method) and equipped with external recovery system. b. On the economic aspect, the automated ultra high pressure water jetting method is only economically viable if the amount of cleaning job per year is larger (more than 34,750 m2), while for small cleaning job, the present method review the most cost effective

Drag analysis of three rudder-shaped like bodies

This paper presents an investigation of Rudder Shaped-Like (RSL) hull configurations with low-drag characteristic using the resistance model tests and numerical analysis. The new design of the floating platform using three hulls with a self-manoeuvring system as Unmanned Surface Vehicle (USV) and capable of collecting the same data as a hydrography boat is needed. This platform was designed with three hulls placed in a triangle position in the form of rudder shape and vertically placed as a slender body shape using National Advisory Committee for Aeronautics (NACA) 0012 profile. This provides the low-drag characteristic to USV. The results from the experimental and numerical analysis revealed that a larger configuration distance between three hulls leads to a reduction in resistance of the same speed. This result may help to accomplish the required concept design related to low-drag and minimum power operation