Article Per Year (5 Year)
p-Index From 2020 - 2025
0.778
P-Index
This Author published in this journals
All Journal Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Reflection: Education and Pedagogical Insights PROCEEDING OF INTERNATIONAL CONFERENCE ON BUSINESS MANAGEMENT AND ACCOUNTING
Koto, Jaswar
Unknown Affiliation
Aerospace Engineering Humanities Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences Other

Published : 39 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 39 Documents
Search

 1   2   3   4 
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.
Prediction of Propeller Performance Using Quasi-Continuous Method Rui, Hao; Koto, Jaswar
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 10 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.v10i1.484

Abstract

This research is targeted to apply the numerical method in the ship’s propeller design and analysis. In this thesis, the Quasi Continuous Method developed based on lifting surface theory is applied to predict the performance of propeller in open water condition. To fulfill the desire of industry to obtain an accurate, fast and low cost solution in propeller design, this design and analysis process is proposed made by computer programming software. This is because fast development on computer technology provided the possibility to carry propeller design task by using numerical software. In this research, the Quasi Continuous Method for propeller performance evaluation is applied. This method allows the fast propeller prediction process and low computer cost required. In this research, the VLCC ship model and it propulsion system is preselected. The propeller of the VLCC ship is designed and analyzed using the propeller database system in the numerical software OCARI S-Power. Next, the function of Quasi Continuous Method in the software is applied to predict the open water performance of the designed propeller. Finally, the appropriate propeller model and it dimension is determined in this research. In conclusion, application of numerical software in propeller design is an advance solution where this solution is relatively high efficient compare to the traditional method.
Performance of VLCC Ship with Podded Propulsion System and Rudder Koto, Jaswar; Amin, Amirul
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 3 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.v3i1.521

Abstract

Podded propulsion system becomes common installed in ships due to high maneuvering. The purpose of this paper is to discuss performance of both VLCC ships with podded propulsion and rudder. As initial offset data, published ship (SR221A) was used for generating hull form of a podded propulsion ship using Maxsurf software by maintaining the principal dimension: length, breadth, and draft. In order to suit installation of podded house, the stern part was modified. The hydrostatic data of both ships with podded propulsion and rudder are transferred to Ship Resistance and Propulsion Simulation software to determine the running speed by given same power. It was found that running speed produced by a ship using pod propulsion system lower than the speed produced by a ship using rudder.
Occupational Safety in Production of Traditional Fishing Vessels in Indonesia Koto, Jaswar; Munirah, M.; Arief, Dodi Sofyan
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 4 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.v4i1.515

Abstract

Traditional ship in Indonesia which usually built from wood has small capacity compared to modern steel ship. Compared to modern ship building, mostly the production is to assemble block by block with machines and big cranes. However, traditional ship is one hundred per cent made from the work of man. Workers are not properly trained in a formal engineering school but only learnt the skill from senior workers. Hence, all modern concepts such as the need for safety and a proper ship production flow are not a great concern for them. In this paper, safety issue in traditional ship production process is being observed conducting direct survey to traditional shipbuilding company in Bintan, Indonesia. It is hoped that the outcome is to bring safety awareness to the traditional ship builders.
Semi-Submersible Heave Response Study Using Diffraction Potential Theory with Viscous Damping Correction Sow, C.L; Koto, Jaswar; Abyn, Hassan
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 5 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.v5i1.512

Abstract

This paper discusses the numerical prediction of the semi-submersible’s heave motion. In the previous study, it is observed that the heave motion response predicted by diffraction potential theory is over-estimated in the region where the heave motion is dominated by damping. In this research, viscous damping is included in the calculation to increase the heave damping magnitude in motion equation. The wave force and added mass of semi-submersible is predicted by diffraction potential theory, only the total damping is corrected by sum-up the linear damping from diffraction potential theory with the proposed viscous damping. The heave motion response obtained from the proposed numerical method also compared to the data from the experiment. From the comparison, it can conclude that involved of viscous damping in the calculation will corrected a part of heave motion response tendency and reduce the large over-predicted error of heave motion response at the damping dominate.
Feasibility Study of Win-In-Ground for Rescue Operation in Kepulauan Riau Prayetno, E.; Koto, Jaswar; Kader, A.S.A.
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.v1i1.508

Abstract

This study aims to investigate performance of current rescue facilities and position based on statistic data of sea accident between 2010 and 2011 in Kepulauan Riau. Current rescue facilities are located at the latitude 0.93105 and longitude 104.4. Using the statistic data, an optimal recue location and facilities in Kepulauan Riau are determine based on International Maritime Organization (IMO) standard. International Maritime Organization requirement , a n emergency, passengers should be able to leave the ship with time 60 minutes. The optimal position and rescue facilities are determined using Great Circle Distance- Spherical Trigonometry and Statistical of Standard Error methods. In this study, simulation code is developed using visual basic 2010 language. Results of simulation show current rescue facility requires a lot of time to reach the accident location which is up to 12.5 hours. In order to meet IMO requirement, this study proposes wing in ground for rescue operation. Using current rescue location, wing in ground also does not meet the IMO standard which is up to 3.04 hours. Additional, this study divides the Kepulauan Riau into two regions of rescue operation. The optimal for rescue facilities of region 1, at the latitude 0.74568 and longitude 104.36256 , and based on the distribution of the accidents in Kepulauan Riau 2010-2011, current rescue facility required up to 5.6 hours to reach the accident area, while the wing in ground facilities required up to 1.3 hours. The optimal for rescue facilities of region 2, at the latitude 3.00338 and longitude 107.79373 , current rescue facility required up to 5 hours to reach the accident area, while the wing in ground facilities required shorter time that is up to 1.2 hour.
Study on Wave Buoy Legged Spider Power Device A, Priyanto; A., Maimun; M., Zamani; Koto, Jaswar; A.S.A, Kader
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.v6i1.501

Abstract

This paper studied on Wave Buoy Legged Spider power device, a floating wave energy system based on linear generator. The device contains horizontal cylinders arranged such that it looks like the legs of a spider. Inside cylinders will be equipped with a linear generator. During wave motions, some rotors of the linear generators slide forward and backward, thus generating electricity. As a case, a conceptual design of the Wave Buoy Legged Spider device using floating balls of Malaysian wave buoy for an ocean site in Terengganu, West Malaysia is presented. The wave energy was approximately assessed based on observed wave data. Furthermore a method to determine the directional wave spectra by using nonlinear programming has been proposed with introducing a correction factor in order to avoid the concentration of power spectral density. The capability of this method has been verified by the analysis with the data of the experiments of the floating ball response.
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.
Absorption Acid Gas Removal in Liquefied Natural Gas Process Koto, Jaswar
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 7 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.v7i1.497

Abstract

Simulation of fluid mechanic of amine absorber process in removing acid gas from feed sour gas in LNG production plant is presented in this paper. The amine absorption in the Removing Acid Gas Process is designed to remove carbon dioxide, hydrogen sulfide and other sulfur compounds from the sour feed gas. The sour gas together with the recycle gas from the Treater unit enters the bottom of Amine Absorber and flows upward and passes through a demister pad to water wash section. In the Amine Absorber, the down-flowing amine solution absorbs and from the up-flowing sour gas to produce a sweetened gas stream as a product and an amine solution rich in the absorbed acid.
Review on Aerodynamic Characteristics of Helicopter Tail Rotor Propeller Using Quasi-Continuous Vortex Lattice Metho Firdaus, Firdaus; Koto, Jaswar; Ammoo, M.S; Ishak, I.S.; Nofrizal, Nofrizal
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 7 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.v7i1.495

Abstract

This paper reviews on application of quasi continuous vortex lattice method for determining the performance of helicopter tail rotor propeller. Tail rotor blade for Bell B206 of one seat helicopter is used. The method is developed to be suitable for analyzing the performance of propeller in term of thrust, torque, and efficiency. These parameters are calculated based on pressure on blade.
Co-Authors A, Priyanto A., Maimun A.S.A, Kader Abdul Halim, Muhammad Farid Abdul Khair Junaidi Abyn, Hassan Achmad Tavip Junaedi Afrizal, Efi Ahmad, Norhaziyah Afiqah Binti Ahmed, Yasser Mohamed Alias, Adib Zulhilmi Mohd Amin, Amirul Ammoo, M.S Ammoo, Mohd. Shariff bin Amran, Nur Aireen Amries Rusli Tanjung Aref, A. Awal, Ziad Bin Abdul Bin Mohd Alwi, Mohd Amirul Hamdi Cecilia, Cecilia Dalil, M Dalil, M. Dehghani, Zahra Dodi Sofyan Arief, Dodi Sofyan Effendy, Moh Hafidz Firdaus Firdaus Gusrio Tendra Harry Patuan Panjaitan Ishak, I.S. Jahrizal Jamil Haron, Surhan Junaidi, Abd Khair Kader, A.S.A. Khairuddin, N. M. Khairuddin, N.M. Kidd, Peter M., Zamani Marlim, Yulvia Nora Munirah, M. Musa, Sulaiman Nekooei, Mohammad Javad Nicholas Renaldo Nik Ismail, Nik Mohd Khairuddin B. Nikfarjam, M. Nofrizal Nofrizal Nyoto Nyoto, Nyoto Patrick, Bayo-Philip Prayetno, E. Priyanto, A. Purnama, Intan Putri, Novita Yulia Rahman, Sarli Rashidi, M. Rui, Hao Sanusi Sanusi Seif, M. S. Siow, C.L Siow, C.L. Sow, C.L Suhardjo Veronica, Kristy Wahid, Nabila Wilda Susanti Yaacob, Amirrudin Yaakob, O. B. Zakaria, Zainul Azhar Zarina, M.K Puteri Zulkarnain Zulkarnain