Date(s) - 30/01/2018
2:30 pm - 4:30 pm
Categories No Categories
Will be held as stated below.
Date : 30 January, 2018 (Tuesday)
Time : 2.30 pm – 4.30 pm
Venue : Seminar Hall, Level 1, Block C23
1st Presenter : Dr. Kang Hooi Siang
Presentation Title : Numerical Analysis on Top-Tensioned Riser System For Floating Offshore Structures
2nd Presenter : Mr. Md Habibur Rahman, student from Liverpool John Moores University
Presentation Title : Transport Capacity Improvement by Reducing Empty Container Truck Trips:
Reengineering the Container Truck Hauling Process with The Collaboration of The
Logistic Companies in Bangladesh
Session Chairman: Dr. Mohd Foad Abd Hamid
All staff are kindly invited. Thank you.
NUMERICAL ANALYSIS ON TOP-TENSIONED RISER SYSTEM FOR FLOATING OFFSHORE STRUCTURES
Hooi-Siang KANG, Ph.D. AM.RINA (UK), M.IAOE (USA)
Department of Aeronautical, Automotive & Ocean Engineering
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia
A reliable and cost-effective way to protect the hydrocarbon production modules in harsher environments has been crucial to the success of offshore oil and gas projects. Nevertheless, the excessive tension variations in the top-tensioned risers (TTRs) can lead to catastrophic structural integrity issues. Magneto-rheological (MR) damper is a controllable device which can reduce the tension variations. However, the integration and behaviors of MR damper remain a significant challenge for floating platforms. The main purpose of this research is to develop numerical analysis tool to analyze the specific characteristics of MR damper in offshore structural dynamics and interactively changing the structural behaviors correspond to various external loadings. The research methodologies were initiated by modeling the hydro-pneumatic tensioner (HPT) of TTR in component-level, which included hydro-pneumatic components and viscous fluid frictional effect. The HPT model was numerically incorporated with MR damper. This numerical tool combined with CHARM3D, a fully-coupled time-domain dynamic analysis program for floating bodies, mooring lines, and risers. The responses of the combined numerical model were simulated by coupling with tension leg platform (TLP) and dry-tree semi-submersibles (DTS), respectively, under the 100-year extreme condition and 1000-year survival condition of central Gulf of Mexico (GOM). The MR damper was controlled by using semi-active controllers that were developed in fuzzy-logic and skyhook schemes. Mathieu’s stability analysis was utilized to predict TTR’s parametric stability. The results manifested that total required stroke length in DTS can be reduced by as much as 0.963 meters in the studied case after MR damper was incorporated with a semi-active fuzzy logic controller. By providing damped and deformed contact surface, MR damper was able to redistribute the excessive tension in the tensioner cylinders during extreme bottom-out motion. Moreover, the dynamic tension variations of TTR can be suppressed by 94 percent in the case of TLP. In conclusion, these results are beneficial to assure service lifespan of TTR’s tensioner and moderate the relevant operational expenditure (OPEX). In addition, the reductions of the total required stroke length and tension variations in DTS have enabled the platform designer to be more flexible in the sizing of the DTS and TTR tensioners.
Title: Transport capacity improvement by reducing empty container truck trips: Reengineering the container truck hauling process with the collaboration of the logistic companies in Bangladesh
The purpose of this research is to explore the application of “shared-transportation” concept in sharing container trucks to reduce the number of empty trips and to surge transport capacity without much efforts and investments. This research (study 1) will provide an update of the application of Collaborative Transportation Management (CTM); (study 2) will identify to what extent CTM can increase collaboration among all the involved transportation parties to reduce empty container truck trips from Dhaka to Chittagong sea port and vice versa; (study 3) develops a computer-based dynamic truck-sharing facility (TSS model) to assign probable candidate containers to available empty slots of a container truck; and finally (study 4) explores the truck-sharing challenges and suggests an effective way of dealing with those to achieve higher level of collaboration from a real-life perspective. Mixed method approach and case study technique have been applied to get a better and fair representative of the Collaborative Transportation Management Systems (CTMS) of Truck companies and also explore the solutions of research problems. A solution to the problem of increasing hinterland transport capacity is to appropriately use the huge number of idle truck slots through Collaborative Transportation Management System (CTMS), its potential benefits with key constraints and propositions to handle those. This has been addressed here from a decentralized view where all truck companies have an equal chance to contribute to optimize the whole supply chain in contrast with the typical one-company-based optimization.
Keywords: Transport Capacity, Collaborative Transportation Management (CTM), Empty container truck sharing, Logistic companies, Collaborative Transportation Management Systems (CTMS).