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Dr. Cheng Yee Ng
Universiti Teknologi PETRONAS (UTP)

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0 Hydrodynamics
0 marine renewable energy
0 Floating Structures
0 hydrodynamics performance of marine renewable energy devices
0 directional waves

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Conference paper
Published: 01 January 2021 in Lecture Notes in Civil Engineering
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The power generation efficiency of a flow driven Marine Current Turbine (MCT) depends upon the Torque (Q) induced by the flow on the turbine and the Angular velocity (ω) achieved. The greater the mass of turbine blade, the more will be the Q induced but subsequently will result in lower ω. However, on the contrary, lower mass will result in higher ω and lower Q. It is therefore necessary for any flow driven MCT to achieve the optimum balance of Q and ω so that a turbine model with maximum efficiency can be designed. In this paper, a similar study has been discussed where three different profiles by varying the radius of a horizontal axis turbine blade have been studied using numerical simulations. Emphasis has been given to obtain a blade profile which can attain an optimal combination of Q and ω to maximize the power output. The simulations have been carried out for flow velocity of 1 m/s and the average values have been reported in results.

ACS Style

Nauman Maldar; Cheng Yee Ng; Ahmad Fitriadhy; Hooi Siang Kang. Numerical Investigation of an Efficient Blade Design for a Flow Driven Horizontal Axis Marine Current Turbine. Lecture Notes in Civil Engineering 2021, 241 -248.

AMA Style

Nauman Maldar, Cheng Yee Ng, Ahmad Fitriadhy, Hooi Siang Kang. Numerical Investigation of an Efficient Blade Design for a Flow Driven Horizontal Axis Marine Current Turbine. Lecture Notes in Civil Engineering. 2021; ():241-248.

Chicago/Turabian Style

Nauman Maldar; Cheng Yee Ng; Ahmad Fitriadhy; Hooi Siang Kang. 2021. "Numerical Investigation of an Efficient Blade Design for a Flow Driven Horizontal Axis Marine Current Turbine." Lecture Notes in Civil Engineering , no. : 241-248.

Journal article
Published: 09 December 2020 in Ain Shams Engineering Journal
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Self-healing mechanism (SHM) application has attracted interest due to ability to self-heal as response to damage situations in various conditions, and is being actively explored. However, the application of SHM that can be autonomously triggered for temporarily keeping structural integrity of underwater robotic vehicle (URV) under flooding condition is still scarce publicly. This paper describes an investigation in watertight integrity performance of URV’s hull under damaged stability criteria. The main goal is to investigate the characterization of a rapid SHM through an experiment for identifying progressive flooding in a damaged URV’s hull. Here, it is demonstrated that the effectiveness of sodium polyacrylate, a kind of superabsorbent polymers (SAP), had been studied by applying the polymer on an experimental model of damaged URV’s hull. A comparison is studied for the stability of the flooded URV and the mass of water accumulated inside the URV’s hull between the cases of before and after applying the SHM in the damaged model under different damaged conditions. The results showed that the SHM application had rapidly blocked the damaged leak hole and prevented severe water flow ingress in the damaged URV’s hull. Swift recovery of buoyancy was obtained, as the volume of absorbed water by SHM was converted into equivalent buoyancy loss. These findings are establishing a fundamental knowledge for implementation of SHM in underwater robotic structures.

ACS Style

Gang Ma; Muhammad Hanis Kamaruddin; Hooi-Siang Kang; Pei-Sean Goh; Moo-Hyun Kim; Kee-Quen Lee; Cheng-Yee Ng. Watertight integrity of underwater robotic vehicles by self-healing mechanism. Ain Shams Engineering Journal 2020, 12, 1995 -2007.

AMA Style

Gang Ma, Muhammad Hanis Kamaruddin, Hooi-Siang Kang, Pei-Sean Goh, Moo-Hyun Kim, Kee-Quen Lee, Cheng-Yee Ng. Watertight integrity of underwater robotic vehicles by self-healing mechanism. Ain Shams Engineering Journal. 2020; 12 (2):1995-2007.

Chicago/Turabian Style

Gang Ma; Muhammad Hanis Kamaruddin; Hooi-Siang Kang; Pei-Sean Goh; Moo-Hyun Kim; Kee-Quen Lee; Cheng-Yee Ng. 2020. "Watertight integrity of underwater robotic vehicles by self-healing mechanism." Ain Shams Engineering Journal 12, no. 2: 1995-2007.

Review
Published: 26 October 2020 in Energy Conversion and Management
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The trend of utilizing renewable energy sources is witnessing a brisk growth around the world. Among the various sources of renewable energy, hydropower is considered the most favorable due to its high potential and distinct advantages such as predictability, high energy density etc. Moreover, to extract the hydrokinetic energy from flowing streams, different designs of hydrokinetic turbines have emerged which operate on a similar principle as the wind turbines. The Savonius turbine is a drag-based device reported to have good starting characteristics, which makes it a fitting choice for hydrokinetic energy extraction, especially in low-velocity flows. However, along the development, it was noted that somehow this turbine has a poor energy conversion efficiency. To overcome this limitation, various design optimization strategies have been proposed. This paper attempts to review the optimization studies of Savonius turbine regarding its probable applications in harnessing hydrokinetic energy. The studies concerning each of the structural parameters influencing the turbine performance are discussed thoroughly. There is hardly any review study available hitherto, which exclusively discusses and summarizes the optimization studies conducted for Savonius design by solely considering water as the operating medium. Hence, the data presented in this study will serve as a basis to understand the existing research on Savonius turbine, thereby enabling researchers to fill the gaps in this area with reference to hydrokinetic applications.

ACS Style

Nauman Riyaz Maldar; Cheng Yee Ng; Elif Oguz. A review of the optimization studies for Savonius turbine considering hydrokinetic applications. Energy Conversion and Management 2020, 226, 113495 .

AMA Style

Nauman Riyaz Maldar, Cheng Yee Ng, Elif Oguz. A review of the optimization studies for Savonius turbine considering hydrokinetic applications. Energy Conversion and Management. 2020; 226 ():113495.

Chicago/Turabian Style

Nauman Riyaz Maldar; Cheng Yee Ng; Elif Oguz. 2020. "A review of the optimization studies for Savonius turbine considering hydrokinetic applications." Energy Conversion and Management 226, no. : 113495.

Journal article
Published: 20 April 2020 in Sustainability
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Several different designs and prototypes of ocean current turbines have been tested over recent years. For every design test, emphasis is given to achieving an optimum power output from the flow. In this study, the performance of a Horizontal Axis Ocean Current Turbine (HAOCT) has been investigated using three-dimensional Computational Fluid Dynamics (CFD) simulations for three cases, namely, (1) a turbine without a deflector, (2) a turbine with a deflector, and (3) a turbine with a deflector operating at a higher fluid depth. The turbine design was modeled in DesignModeler software and simulations were carried out in commercial CFD software Flow-3D. The Torque Coefficient (Cm) and Power Coefficient (Cp) for the turbine have been investigated for a certain range of Tip-Speed Ratios (TSRs) in a flow velocity of 0.7 m/s. Furthermore, comparisons have been made to demonstrate the effect of the deflector on the performance of the turbine and the influence of a higher fluid pressure on the same. The results from the simulations indicate that the higher value of Cp was achieved for Case 2 as compared to the other two cases. The findings from the study indicate that the use of the deflector enhances the performance of the turbine. Furthermore, a higher fluid pressure acting on the turbine has a significant effect on its performance.

ACS Style

Nauman Riyaz Maldar; Cheng Yee Ng; Lee Woen Ean; Elif Oguz; Ahmad Fitriadhy; Hooi Siang Kang. A Comparative Study on the Performance of a Horizontal Axis Ocean Current Turbine Considering Deflector and Operating Depths. Sustainability 2020, 12, 3333 .

AMA Style

Nauman Riyaz Maldar, Cheng Yee Ng, Lee Woen Ean, Elif Oguz, Ahmad Fitriadhy, Hooi Siang Kang. A Comparative Study on the Performance of a Horizontal Axis Ocean Current Turbine Considering Deflector and Operating Depths. Sustainability. 2020; 12 (8):3333.

Chicago/Turabian Style

Nauman Riyaz Maldar; Cheng Yee Ng; Lee Woen Ean; Elif Oguz; Ahmad Fitriadhy; Hooi Siang Kang. 2020. "A Comparative Study on the Performance of a Horizontal Axis Ocean Current Turbine Considering Deflector and Operating Depths." Sustainability 12, no. 8: 3333.

Journal article
Published: 20 December 2019 in Journal of Marine Science and Engineering
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The stability of FPSO or offloading shuttle tanker may be affected in wave conditions which excite parametric rolling. The offloading operations are thereby ceased and eventually leads to loss in production which affects the revenue of global production, better known as downtime cost. This paper discusses downtime cost analysis of offloading operations due to parametric rolling of shuttle tanker under regular waves in Malaysian waters for three different locations. The downtime due to parametric rolling is investigated for two different water depths for which the probability of occurrence was calculated from the location specific wave scatter diagram. The results of parametric rolling of shuttle tanker along with downtime cost charts are presented. Additionally, a Graphical User Interface (GUI) was developed and its work procedure is demonstrated in this paper. The down-time cost calculator will help the oil operator companies to analyze the economic risks involved for field developments and anticipate the loss in revenue for downtime occurrences. The developed GUI was copyrighted under literary work as intellectual property.

ACS Style

M. S. Patel; M. S. Liew; Zahiraniza Mustaffa; Ng Cheng Yee; Andrew Whyte. Development of Downtime Cost Calculator for Offloading Operations Influenced by Parametric Rolling. Journal of Marine Science and Engineering 2019, 8, 7 .

AMA Style

M. S. Patel, M. S. Liew, Zahiraniza Mustaffa, Ng Cheng Yee, Andrew Whyte. Development of Downtime Cost Calculator for Offloading Operations Influenced by Parametric Rolling. Journal of Marine Science and Engineering. 2019; 8 (1):7.

Chicago/Turabian Style

M. S. Patel; M. S. Liew; Zahiraniza Mustaffa; Ng Cheng Yee; Andrew Whyte. 2019. "Development of Downtime Cost Calculator for Offloading Operations Influenced by Parametric Rolling." Journal of Marine Science and Engineering 8, no. 1: 7.

Journal article
Published: 12 September 2019 in DESIDOC Journal of Library & Information Technology
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Internationalization is defined as a process of integrating an international, intercultural, or global dimension into the teaching and learning of education. International co-authorship in research article is one of the means of collaboration towards internationalization. This paper investigates the impact of international co-authorship in the field of Science, Technology, Engineering and Mathematics (STEM) for a specialised young university (

ACS Style

Cheng Yee Ng; Zahiraniza Mustaffa; Kurian V John. Impact of International Coauthorships to A Young Malaysian University Specializing in Science, Technology, Engineering and Mathematics (STEM). DESIDOC Journal of Library & Information Technology 2019, 39, 238 -243.

AMA Style

Cheng Yee Ng, Zahiraniza Mustaffa, Kurian V John. Impact of International Coauthorships to A Young Malaysian University Specializing in Science, Technology, Engineering and Mathematics (STEM). DESIDOC Journal of Library & Information Technology. 2019; 39 (5):238-243.

Chicago/Turabian Style

Cheng Yee Ng; Zahiraniza Mustaffa; Kurian V John. 2019. "Impact of International Coauthorships to A Young Malaysian University Specializing in Science, Technology, Engineering and Mathematics (STEM)." DESIDOC Journal of Library & Information Technology 39, no. 5: 238-243.

Journal article
Published: 31 July 2019 in The Open Civil Engineering Journal
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Background: High permeable concrete is designed with high porosity, which allows water to pass through it. By considering this ability, it has been widely used for various applications including high permeable road pavement. However, to fully adopt highly permeable road pavement technology is challenging due to high cost and maintenance, besides the present engineers and contractors have insufficient expertise and experience with this technology. Henceforth, the high porosity property is highly favorable for road curb applications especially in the tropical region like Malaysia with high rainfall intensity. Objective: This paper aimed to determine the properties of the concrete experimentally, and propose the optimum mix design of high permeable concrete for road curb. Methods: The flow value and setting time of the cement paste were investigated. Next, the effects of the modified high permeable concrete with varying amount of crumb rubber on compressive strength, permeability and void ratio were also investigated. Results and Conclusion: Results have revealed that the workability of the cement paste increases when the water-binder ratio and the amount of fly ash increase. Meanwhile, an increasing amount of cement ratio and crumb rubber lowers the flow value and consequently leads to lower void ratio and permeability. Besides, it has been found that the higher the compressive strength, the lower the void ratio and permeability of the concrete. The research findings support that using an optimum amount of cement replacement with crumb rubber as an additive may increase the performance a high permeable concrete. Herein, the results indicate that the mix design of the concrete studied has the potential to be applied onto the road curb.

ACS Style

Cheng Yee Ng; Anaqi Ratna Narong; Aifaa Balqis Kamarul Zaman; Zahiraniza Mustaffa; Bashar S. Mohammed; Lee Woen Ean. Properties of Modified High Permeable Concrete with a Crumb Rubber. The Open Civil Engineering Journal 2019, 13, 82 -91.

AMA Style

Cheng Yee Ng, Anaqi Ratna Narong, Aifaa Balqis Kamarul Zaman, Zahiraniza Mustaffa, Bashar S. Mohammed, Lee Woen Ean. Properties of Modified High Permeable Concrete with a Crumb Rubber. The Open Civil Engineering Journal. 2019; 13 (1):82-91.

Chicago/Turabian Style

Cheng Yee Ng; Anaqi Ratna Narong; Aifaa Balqis Kamarul Zaman; Zahiraniza Mustaffa; Bashar S. Mohammed; Lee Woen Ean. 2019. "Properties of Modified High Permeable Concrete with a Crumb Rubber." The Open Civil Engineering Journal 13, no. 1: 82-91.

Conference paper
Published: 17 September 2018 in MATEC Web of Conferences
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Ship-shaped Floating Production Storage Offloading platforms (FPSO) are commonly used in the production of oil and gas in offshore deepwater regions. The vessel is held in place by mooring lines anchored to the seabed during operation, either in spread or turret mooring arrangement. When designing such systems, water depth is a main factor that needs to be considered. At greater depths, the hydrodynamic properties of mooring lines become important and may not be accurately predicted through traditional experiments or numerical quasi-static models. Numerical simulation using coupled dynamic analysis is thus recommended, as the hull-mooring behaviour is analysed simultaneously, and the damping and added mass properties of the entire mooring line system is taken into account. This paper investigates the motions and mooring line tensions of a turret-moored FPSO at various water depths ranging from 1000 m to 2000 m. The analysis focuses on numerical simulations in the fully coupled dynamic time domain. The study utilizes the commercial software AQWA, with the FPSO model subjected to a unidirectional random wave condition. The hull hydrodynamics is first solved using the 3D radiation/diffraction panel method, and the hull response equation is then coupled with the mooring line equation. The dynamic motions and mooring line tensions results are presented in terms of statistical parameters as well as response spectrum. The results highlight the significance of greater water depths on low frequency responses in surge motions and mooring line tensions, and provides insight on the increasing and decreasing trend of these responses.

ACS Style

Matthew Guan; Montasir Osman Ahmed Ali; Cheng Yee Ng. Effect of Water Depths on the Hydrodynamic Responses of an FPSO Platform. MATEC Web of Conferences 2018, 203, 01022 .

AMA Style

Matthew Guan, Montasir Osman Ahmed Ali, Cheng Yee Ng. Effect of Water Depths on the Hydrodynamic Responses of an FPSO Platform. MATEC Web of Conferences. 2018; 203 ():01022.

Chicago/Turabian Style

Matthew Guan; Montasir Osman Ahmed Ali; Cheng Yee Ng. 2018. "Effect of Water Depths on the Hydrodynamic Responses of an FPSO Platform." MATEC Web of Conferences 203, no. : 01022.

Conference paper
Published: 19 March 2018 in E3S Web of Conferences
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The limitations of existing wave basins present a significant challenge when modelling offshore deepwater systems, particularly due to the basin’s relatively shallow depth. Numerical simulation thus becomes valuable in predicting its behaviour during operation at sea. The coupled dynamic analysis is preferred over the traditional quasi-static method, as the former enables the inclusion of damping and added mass properties of the complete mooring line system, which becomes increasingly prominent at greater water depths. This paper investigates the motions and mooring line tensions of a turret moored Floating Production Storage Offloading (FPSO) platform using three numerical models, i.e. a dynamic system, quasi-static system and linear spring system subjected to unidirectional random wave condition. Analysis is carried out using a commercial software AQWA. The first two numerical models utilise a complete system of the same setup and configuration, while the linear spring system substitutes the mooring lines with equivalent linear springs and attempts to match the total mooring line restoring forces with that of the coupled dynamic analysis. The study demonstrates the significance of coupled dynamic analysis on the responses of an FPSO in deepwater. The numerical model of the FPSO is validated against the results of a published work.

ACS Style

Matthew Guan; Montasir Osman; Cheng Yee Ng. Prediction of Deepwater FPSO responses using different numerical analysis methods. E3S Web of Conferences 2018, 34, 02032 .

AMA Style

Matthew Guan, Montasir Osman, Cheng Yee Ng. Prediction of Deepwater FPSO responses using different numerical analysis methods. E3S Web of Conferences. 2018; 34 ():02032.

Chicago/Turabian Style

Matthew Guan; Montasir Osman; Cheng Yee Ng. 2018. "Prediction of Deepwater FPSO responses using different numerical analysis methods." E3S Web of Conferences 34, no. : 02032.

Conference paper
Published: 01 November 2017 in 2017 7th World Engineering Education Forum (WEEF)
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Visualization of the 3D system has been reported as a common constraint for the students throughout the nation. This has brought the authors into concern, whereby first-year civil engineering students scored poorly in the assessment of the subject, Engineering Mechanics, in particularly related to 3D support reaction as compared to other topics. A simple interview has been conducted with the students after the assessment, the main reason given was that they were unable to visualize the system. In contrary, unable to apply the knowledge learned. A model-based learning workshop has been conducted, whereby students have to work out on the activities that were linked to the engineering applications. It was observed that the students' capability of visualizing 3D system were slightly improved.

ACS Style

ChengYee Ng; Kurian V. John. Visualization of 3D Support System for Civil Engineering Students. 2017 7th World Engineering Education Forum (WEEF) 2017, 504 -507.

AMA Style

ChengYee Ng, Kurian V. John. Visualization of 3D Support System for Civil Engineering Students. 2017 7th World Engineering Education Forum (WEEF). 2017; ():504-507.

Chicago/Turabian Style

ChengYee Ng; Kurian V. John. 2017. "Visualization of 3D Support System for Civil Engineering Students." 2017 7th World Engineering Education Forum (WEEF) , no. : 504-507.

Book chapter
Published: 04 August 2016 in Civil, Offshore and Environmental Engineering
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ACS Style

C Ng; S Ng; Noor Zawawi. The effect of short-crested waves on the dynamic responses of semisubmersible: A comparison of long and short-crested waves with current. Civil, Offshore and Environmental Engineering 2016, 75 -79.

AMA Style

C Ng, S Ng, Noor Zawawi. The effect of short-crested waves on the dynamic responses of semisubmersible: A comparison of long and short-crested waves with current. Civil, Offshore and Environmental Engineering. 2016; ():75-79.

Chicago/Turabian Style

C Ng; S Ng; Noor Zawawi. 2016. "The effect of short-crested waves on the dynamic responses of semisubmersible: A comparison of long and short-crested waves with current." Civil, Offshore and Environmental Engineering , no. : 75-79.

Book chapter
Published: 04 August 2016 in Civil, Offshore and Environmental Engineering
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ACS Style

V Kurian; S Tuhaijan; C Ng; Noor Zawawi. Effects of current coexisting with random wave on offshore spar platforms. Civil, Offshore and Environmental Engineering 2016, 39 -43.

AMA Style

V Kurian, S Tuhaijan, C Ng, Noor Zawawi. Effects of current coexisting with random wave on offshore spar platforms. Civil, Offshore and Environmental Engineering. 2016; ():39-43.

Chicago/Turabian Style

V Kurian; S Tuhaijan; C Ng; Noor Zawawi. 2016. "Effects of current coexisting with random wave on offshore spar platforms." Civil, Offshore and Environmental Engineering , no. : 39-43.

Proceedings article
Published: 19 June 2016 in Volume 7: Ocean Engineering
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In South East Asia, Malaysia is one of the leading countries in the oil and gas industry. Today, Malaysia has expanded the explorations into the deeper water region. Before the installation of the Malaysia first deepwater platform, the Kikeh Spar, spar platforms can only be found in the Gulf of Mexico. Malaysian offshore regions are subjected to significant water current. From the literature review carried out, it was found that the current would change the behavior of the sea waves. This is contributing significantly to the environmental loading and affect the dynamic responses of the offshore structures. Hence, the study that focused on the effects of the current together with the wave on the structural dynamic response is necessary. In this study, the effect of the current coexisting with the wave on the dynamic responses of a truss spar model was experimentally investigated and quantified. The model tests were performed in the wave tank of the Offshore Laboratory in Universiti Teknologi PETRONAS with a scaling factor of 1:100. Two sets of environmental conditions were considered in the model tests i.e. wave only and wave-current condition. The dynamic responses of the truss spar model subjected to these conditions were measured. In order to quantify the effect of current, the measured results for the condition with and without current were compared among and presented here. From this investigation, it was found that the existence of the current in the water body has increased the truss spar motions, whereby the higher current velocity, give the higher response.

ACS Style

S. N. A. Tuhaijan; C. Y. Ng; V. J. Kurian. The Effect of Current on the Dynamic Responses of Truss Spar in Malaysia Water. Volume 7: Ocean Engineering 2016, 1 .

AMA Style

S. N. A. Tuhaijan, C. Y. Ng, V. J. Kurian. The Effect of Current on the Dynamic Responses of Truss Spar in Malaysia Water. Volume 7: Ocean Engineering. 2016; ():1.

Chicago/Turabian Style

S. N. A. Tuhaijan; C. Y. Ng; V. J. Kurian. 2016. "The Effect of Current on the Dynamic Responses of Truss Spar in Malaysia Water." Volume 7: Ocean Engineering , no. : 1.

Journal article
Published: 05 January 2015 in Research Journal of Applied Sciences, Engineering and Technology
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ACS Style

V.J. Kurian; C.Y. Ng; M.S. Liew. An Experimental Investigation of the Responses of Classic Spar Platform Subjected to Bi-directional Waves. Research Journal of Applied Sciences, Engineering and Technology 2015, 9, 11 -17.

AMA Style

V.J. Kurian, C.Y. Ng, M.S. Liew. An Experimental Investigation of the Responses of Classic Spar Platform Subjected to Bi-directional Waves. Research Journal of Applied Sciences, Engineering and Technology. 2015; 9 (1):11-17.

Chicago/Turabian Style

V.J. Kurian; C.Y. Ng; M.S. Liew. 2015. "An Experimental Investigation of the Responses of Classic Spar Platform Subjected to Bi-directional Waves." Research Journal of Applied Sciences, Engineering and Technology 9, no. 1: 11-17.

Journal article
Published: 01 October 2014 in Applied Mechanics and Materials
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This work presents an approachto predict the low frequency and wave frequency responses (LFR and WFR) of afloating structure using Kalman smoother adaptive filters based time domain Volterramodel. This method utilized time series of a measured wave height as systeminput and surge motion as system output and used to generate the linear andnonlinear transfer function (TFs). Based on those TFs, predictions of surgemotion in terms of LFR and WFR were carried out in certain frequency ranges ofwave heights. The applicability of the proposed method is then applied in ascaled 1:100 model of a semisubmersible prototype.

ACS Style

Edwar Yazid; M.S. Liew; Setyamartana Parman; V.J. Kurian; C.Y. Ng. Prediction of Surge Motion Response of Floating Structure Using Kalman Smoother Adaptive Filters Based Time-Domain Volterra Model. Applied Mechanics and Materials 2014, 660, 799 -803.

AMA Style

Edwar Yazid, M.S. Liew, Setyamartana Parman, V.J. Kurian, C.Y. Ng. Prediction of Surge Motion Response of Floating Structure Using Kalman Smoother Adaptive Filters Based Time-Domain Volterra Model. Applied Mechanics and Materials. 2014; 660 ():799-803.

Chicago/Turabian Style

Edwar Yazid; M.S. Liew; Setyamartana Parman; V.J. Kurian; C.Y. Ng. 2014. "Prediction of Surge Motion Response of Floating Structure Using Kalman Smoother Adaptive Filters Based Time-Domain Volterra Model." Applied Mechanics and Materials 660, no. : 799-803.

Conference paper
Published: 17 July 2014 in MATEC Web of Conferences
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ACS Style

Edwar Yazid; Mohd Shahir Liew; Setyamartana Parman; V.J. Kurian; ChengYee Ng. Nonlinear System Identification via Basis Functions Based Time Domain Volterra Model. MATEC Web of Conferences 2014, 13, 02031 .

AMA Style

Edwar Yazid, Mohd Shahir Liew, Setyamartana Parman, V.J. Kurian, ChengYee Ng. Nonlinear System Identification via Basis Functions Based Time Domain Volterra Model. MATEC Web of Conferences. 2014; 13 ():02031.

Chicago/Turabian Style

Edwar Yazid; Mohd Shahir Liew; Setyamartana Parman; V.J. Kurian; ChengYee Ng. 2014. "Nonlinear System Identification via Basis Functions Based Time Domain Volterra Model." MATEC Web of Conferences 13, no. : 02031.

Journal article
Published: 01 June 2014 in Applied Mechanics and Materials
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The long-crested wave properties have been widely implemented in the design of offshore structures. However, long-crested waves are seldom found in the real sea condition. Many research papers have also stated that wave forces obtained by the waves would be overestimated. Indeed, the real sea conditions are better represented by the short-crested waves. Hence, in order to obtain an optimum design for the offshore structures with cost and time effective, consideration of the short-crested nature of waves is necessary. In this paper, a study comparing the responses of the classic spar due to short-crested waves and long-crested waves obtained experimentally has been performed. The model tests have been carried out in the wave tank of Offshore Laboratory for Universiti Teknologi PETRONAS. In the model tests, short-crested waves and long-crested waves were generated. Responses of the classic spar model were recorded by the Optical Tracking System (OptiTrack). The responses of the classic spar due to short-crested waves and long-crested waves were compared among. From the comparisons, the responses for short-crested waves in all the three degree of freedom (DOF) were found to be about 35% less than the responses for long-crested waves. Thus, it could be concluded that optimized and economical designs can be arrived at by considering the short-crestedness of the waves for classic spar structures.

ACS Style

Cheng Yee Ng; John Velluruzhathil Kurian; Mohd Shahir Liew. Dynamic Responses of Classic Spar Platform: Short Crested Waves vs. Long Crested Waves. Applied Mechanics and Materials 2014, 567, 235 -240.

AMA Style

Cheng Yee Ng, John Velluruzhathil Kurian, Mohd Shahir Liew. Dynamic Responses of Classic Spar Platform: Short Crested Waves vs. Long Crested Waves. Applied Mechanics and Materials. 2014; 567 ():235-240.

Chicago/Turabian Style

Cheng Yee Ng; John Velluruzhathil Kurian; Mohd Shahir Liew. 2014. "Dynamic Responses of Classic Spar Platform: Short Crested Waves vs. Long Crested Waves." Applied Mechanics and Materials 567, no. : 235-240.

Journal article
Published: 01 December 2013 in Applied Mechanics and Materials
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This work presents a newapproach for nonlinear system identification of floating structures using time-varyingautoregressive with exogenous input (TVARX)–based Volterra model. This methodutilizes time series of measured wave heights as system input and surge motionas system output. Solution to the proposed approach is also proposed via Kalmansmoother algorithm. The efficacy of the proposed method is then applied in ascaled 1:100 model of a prototype truss spar. It is shown that surge motionobtained from the identification results has good agreement with theexperimental results either in time or frequency domain

ACS Style

Edwar Yazid; M.S. Liew; Parman Setyamartana; V.J. Kurian; C.Y. Ng. Nonlinear System Identification of Floating Structures Using Time-Varying ARX-Based Volterra Model. Applied Mechanics and Materials 2013, 465-466, 3 -7.

AMA Style

Edwar Yazid, M.S. Liew, Parman Setyamartana, V.J. Kurian, C.Y. Ng. Nonlinear System Identification of Floating Structures Using Time-Varying ARX-Based Volterra Model. Applied Mechanics and Materials. 2013; 465-466 ():3-7.

Chicago/Turabian Style

Edwar Yazid; M.S. Liew; Parman Setyamartana; V.J. Kurian; C.Y. Ng. 2013. "Nonlinear System Identification of Floating Structures Using Time-Varying ARX-Based Volterra Model." Applied Mechanics and Materials 465-466, no. : 3-7.

Journal article
Published: 01 August 2013 in Applied Mechanics and Materials
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Sea state conditions such as wind, wave and current vary in different ocean waters. Two similar offshore structures installed in two different ocean regions will yield different responses. Determining the transfer function of the structure is a system identification exercise that yields the structural response and behaviour given any sea state condition. The transfer function can be determined using available measured sea state data and structural response data. In this paper, a six-legged semisubmersible physical model is developed to a scale of 1:100 and is tested in a wave tank to measure its responses due to simulated random wave loads. The transfer functions of the semisubmersible model are then determined using the measured responses and the measured wave heights.

ACS Style

Guo Zheng Yew; Mohd Shahir Liew; Cheng Yee Ng. System Identification of a Six-Legged Semisubmersible Subjected to Wave Loads through Frequency Domain Analysis. Applied Mechanics and Materials 2013, 373-375, 770 -784.

AMA Style

Guo Zheng Yew, Mohd Shahir Liew, Cheng Yee Ng. System Identification of a Six-Legged Semisubmersible Subjected to Wave Loads through Frequency Domain Analysis. Applied Mechanics and Materials. 2013; 373-375 ():770-784.

Chicago/Turabian Style

Guo Zheng Yew; Mohd Shahir Liew; Cheng Yee Ng. 2013. "System Identification of a Six-Legged Semisubmersible Subjected to Wave Loads through Frequency Domain Analysis." Applied Mechanics and Materials 373-375, no. : 770-784.

Journal article
Published: 10 July 2013 in Research Journal of Applied Sciences, Engineering and Technology
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ACS Style

V.J. Kurian; M.A. Yassir; C.Y. Ng; I.S. Harahap. Nonlinear Dynamic Analysis of Multi-component Mooring Lines Incorporating Line-seabed Interaction. Research Journal of Applied Sciences, Engineering and Technology 2013, 6, 1428 -1445.

AMA Style

V.J. Kurian, M.A. Yassir, C.Y. Ng, I.S. Harahap. Nonlinear Dynamic Analysis of Multi-component Mooring Lines Incorporating Line-seabed Interaction. Research Journal of Applied Sciences, Engineering and Technology. 2013; 6 (8):1428-1445.

Chicago/Turabian Style

V.J. Kurian; M.A. Yassir; C.Y. Ng; I.S. Harahap. 2013. "Nonlinear Dynamic Analysis of Multi-component Mooring Lines Incorporating Line-seabed Interaction." Research Journal of Applied Sciences, Engineering and Technology 6, no. 8: 1428-1445.