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Siow, C.L.
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Aerospace Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Experimental Study of Gap Distance between Floating Structures in Tandem Arrangement Koto, Jaswar; Siow, C.L.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 9 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v9i1.486

Abstract

This research is proposed to study the effect of wave condition to the distance between floating structures which arranged in tandem arrangement. The evaluation on the gap distance between floating structures is an important study for offshore liquefied natural gas, LNG offloading system because small gap distance between floating structures is needed to guarantee the effectiveness of LNG transfer from FPSO to ship but collision between floating structures should be avoided. Therefore, the gap distance between floating structures becomes a main factor to ensure the safety of the arrangement and effectiveness of the offloading system. Model experiment in regular wave condition was carried out to analyze the motion of floating structures and the effect of wave on changing of gap distance between structures. The time domain motion data are measured by Qualisys Camera and then Fourier Transformation method is applied to transform the data to frequency domain for further analysis. The frequency domain data is utilized in this research to find the tendency of gap distance between floating structures due to the effect of structures response and wave condition. From the study, an empirical equation to simulate the minimum gap distance between floating structures is introduced.
Design Study of High Performance Steam Propulsion System for LNG Carrier Siow, C.L.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 1 No 1 (2013): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v1i1.506

Abstract

This paper was discussed the current possibility technology can be used to design a high performance steam propulsion system for an LNG carrier. The propose system was designed based on the available technology for marine industry. The technical performance analysis was carried out to evaluate the improvement of the system. Economic performance for this system was also discussed in paper. The sensitivity analysis used for the economic performance analysis was made by varying the relative system initial cost and fuel price to cover several possible economic conditions to operate LNG Carrier.
Concept of Gap Distance in Motion Interaction between Multiple Floating Bodies Koto, Jaswar; Siow, C.L.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 2 No 1 (2013): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v2i1.504

Abstract

Conceptual study on gap distance between multiple floating structures system was related to the effect of wave particle motion on structure motion. The evaluation on the gap distance between floating structures is an important study for multiple floating structures system especially for deep water liquefied natural gas, LNG exploration because the small gap distance between floating structures is needed to guarantee the effectiveness of LNG transfer. This conceptual study only discussed the effect of wave particle motion to the varying of gap distance between structures based on theoretical point of view. The expected result was generated by simple harmonic motion equation but it is no been validate in this paper. The expected result shown that the wave length and the structures initial gap distance give a significant effect to the minimum gap distance can be achieved by two floating structures. The mentioned minimum gap distance in this paper mean minimum distance between two floating structures achieved due to surge motions induced by wave. In addition, the comparison to various selected case found that at the condition where one structure face wave crest and other structure face wave trough will caused closest minimum gap distance between floating structures but minimum gap distance will be the largest if both structures face wave crest and wave trough at simultaneously. Therefore, proper selection of initial gap distance for different ocean condition can help to avoid crashing happen on structures when experience wave induced motion.
Study on Model Scale Rounded-Shape FPSO’s Mooring Lines Siow, C.L.; Koto, Jaswar; Khairuddin, N.M.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 12 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v12i1.473

Abstract

This paper is proposed to discuss the model scale mooring line selection process and preparation for hydrodynamic model experiment. The model scale mooring line should be proper select for model experiment and the error should be minimized because the error in model scale mooring line will be enlarged by the scale factor and influence the design in full scale model. In this study, tensile test experiment for model scale wire ropes was conducted to collect the material properties data of the wire ropes. The data collected from the tensile test is applied to obtain the stiffness of mooring lines in the model scale. To achieve the target to select the model scale mooring lines, the minimum breaking load of the wire ropes and the elongation curve of the wire ropes are collected from tensile test for each wire rope sample. By applying catenary theory and the data from tensile test, the stiffness curve of the mooring line in model scale was estimated. The Difference between the stiffness curve between model scale and full scale is within acceptable at the required experiment range.
Theoretical Review on Prediction of Motion Response using Diffraction Potential and Morison Siow, C.L.; Koto, J.; Yasukawa, H.; Matsuda, A.; Terada, D.; Guedes Soares, C.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 18 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v18i1.452

Abstract

This paper reviewed the capability of the proposed diffraction potential theory with Morison Drag term to predict the Round Shape FPSO heave motion response. From both the self-developed programming code and ANSYS AQWA software, it can be observed that the diffraction potential theory is over predicting the Round Shape FPSO heave motion response when the motion is dominated by damping. In this study, Morison equation drag correction method is applied to adjust the motion response predicted by diffraction potential theory. This paper briefly present the procedure to integrate the Morison equation drag term correction method with the diffraction potential theory and then, the proposed numerical method was applied to simulate the Round Shape FPSO heave motion response. From the comparison, it can be concluded that Morison equation drag correction method is able to estimate the FPSO heave response in the damping dominated region and provides more reasonable motion tendency compare to the diffraction potential theory without consider the drag effect in the calculation.
Prediction of Motion Responses of Ship Shape Floating Structure using Diffraction Potential Siow, C.L.; Koto, J.; Pauzi, M.; Yasukawa, H.; Matsuda, A.; Terada, D.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 20 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v20i1.446

Abstract

This paper reviewed the capability of the proposed programming coded based on diffraction potential theory to predict a ship shape floating structure’s motion response. This paper briefly presents the procedure to apply the diffraction potential theory to simulate the ship shape floating structure’s motion response. As case study, the proposed programming code was applied to prediction motion responses of ship shape floating structure in surging, heaving, pitching, swaying, rolling and yawing directions. Results of simulation were compared with ANSYS AQWA software as bench mark. It found that the simulation results by the proposed programming code are similar with the ANSYS one.
Linearized Morison Drag for Improvement Heave Response of Semi-Submersible by Diffraction Potential Siow, C.L.; Koto, Jaswar; Abyn, Hassan; Khairuddin, N. M.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 6 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v6i1.499

Abstract

This research is targeted to improve the semi-submersible heave response prediction by using diffraction potential theory by involving drag effect in the calculation. The comparison to the experimental result was observed that heave motion tendency predicted by the diffraction potential theory is no agreed with motion experimental result when the heave motion is dominated by damping. In this research, the viscous damping and drag force for heave motion is calculated from the drag term of Morison equation. The nonlinear drag term in Morison equation is linearized by Fourier series linearization method and then inserted into the motion equation to correct the inadequate of diffraction potential theory. The proposed numerical method is also applied to simulate the semi-submersible motion response to obtain the heave motion tendency predicted by this numerical method. In comparison to the experimental result which tested at the same wave condition obtained that the diffraction potential theory with the Morison drag term correcting is able to provide satisfying heave response result especially in damping dominated region.
Co-Authors Abyn, Hassan Guedes Soares, C. Khairuddin, N. M. Khairuddin, N.M. Koto, J. Koto, Jaswar Matsuda, A. Pauzi, M. Terada, D. Yasukawa, H.