The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
Se Rgio Nogueira - One of the best experts on this subject based on the ideXlab platform.
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development of a Inclining Test procedure applicable to semi floating production units moored on location
ASME 2009 28th International Conference on Ocean Offshore and Arctic Engineering, 2009Co-Authors: Se Rgio NogueiraAbstract:The constant modifications that are done aboard floating units have direct impact on the safety requirements regarding stability. With few exceptions these modifications imply on onboard construction (e. g. process plant upgrade), and the correspondent rise of light ship weight. The consequence will be a negative effect on stability, and because the semi submersible has a very low stability margin, a reduction of the capacity for future modifications that will probably be necessary as well as the ability to deballast to lower drafts. According the Rules applicable the modification of the light ship weight that surpasses a defined limit must be checked through an Inclining Test that can only be executed with the unit in sheltered waters. For a Floating Production Unit (FPU) this Test is unfeasible because of the operational procedure (the need to disconnect anchor lines and risers, tow and reconnect) and the production downtime. The alternative is to negotiate with the regulatory bodies a penalty for the light ship modifications that imply in a further reduction on the range of stability and the correspondent capacity of the unit the undergo further and necessary modifications. The motivation of this work is to develop an Inclining Test procedure that can be applied to semi submersible floating production units moored on location, without the need to tow to sheltered waters, which will yield results as accurate as the ones obtained through the conventional Inclining Test, and also accepted by the main Classification Societies. To achieve this it is necessary to first determine the accuracy of the conventional Inclining Test accepted by the Classifications Societies by means of a detailed statistical analysis. Then innovations are proposed in the instruments used to measure de physical parameters, the hydrostatic relation between moment and angle, and the Test procedure itself with much better accuracy compared to the conventional procedure. Reliable and Tested computational tools are developed to model risers and mooring line forces to determine their effect, and statistical tools are proposed to filter wind and wave influence. The result is an acceptable alternative to the conventional Inclining Test that is consistent with the stability rules that apply, permits a reliable determination of the main stability parameters, reduction on the penalties and consequently further and most necessary modifications aboard. This work is based on the author’s thesis for a Masters Degree at COPPE/UFRJ, currently underway at the Graduate Engineering Project Coordination at Rio de Janeiro Federal University.Copyright © 2009 by ASME
Sun Mingyuan - One of the best experts on this subject based on the ideXlab platform.
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Study on Method of Inclining Test of Jackup Rig
2011Co-Authors: Sun MingyuanAbstract:At present,the technology of ship Inclining Test has fully developed,but the method and the criterion about that of offshore oil platforn are not so perfect.Two methods of Inclining Test called as balancing weigt method and cantilever beam method are described and simulated based on the software Sesam in this paper,providing full scale Test with necessary reference data and specific operation steps.The application ranges,merits and demerits of different methods are analyzed,the method and computation process which are applicable to jackup rig are presented.The results show that Sesam could reduce the workload of Inclining Test and get more accurate result.
Gormand MaËl - One of the best experts on this subject based on the ideXlab platform.
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Full Scale Test Case For Sailing Yacht Performance
Chalmers University of Technology Göteborg, 2015Co-Authors: Gormand MaËlAbstract:The present master thesis investigates the possibilities of producing a full scale Test case of the performance of sailing yachts. With such a Test case, it is believed that instantaneous and absolute performance of sailing yacht evolving in real conditions can be investigated. An out-put of this study is the ability to validate a velocity prediction program with full scale data. Through the use of a sailing yacht, a procedure for performance measurement at sea was developed. This procedure involves the use of on-board electronic instrumentation, displacement measurement and Inclining Test. A code is developed in Excel c , using VBA c to sort all the data gathered during the measurement campaign. The sorting of data involves the compilation of a database used for plotting the performance of the yacht in two different ways: the first to analyse the instantaneous behaviour of the yacht; the second to analyse the maximum potential performance the yacht can reach. The measurements can then be compared with simulations produced in the “same” sailing condition using a VPP. In this paper, two VPPs are investigated: SailSim c from SSPA AB and WinDesign c from the Wolfson unit at the University of Southampton. The first software has dynamical capabilities but was not used in the end for this research. The second one has only static capabilities and was used for the simulations in the present work. From the comparison between the measurements and the simulations, the quality of full scale data is established and the possibility to validate a VPP using standard sailing electronics is demonstrated. Further development is also suggested and further analysis involving full scale data is proposed. In the present master thesis a universal method to record sailing yacht’s performance data at sea was developed. Then a code to process these data and sort them into a general database useful for further studies was built. It was proven that the quality of nowadays electronics make scientific studies possible. Finally it was demonstrated that standard velocity prediction programs can be validated by full scale data
Chen Shu-mi - One of the best experts on this subject based on the ideXlab platform.
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Data Error Analysis of Inclining Test for the Semi-submersible Unit
2015Co-Authors: Chen Shu-miAbstract:Based on the under-construction semi-submersible unit project,the factors affecting accuracy of the Inclining Tests and the data reading methods are discussed about. The error analysis for the data in the Inclining Tests for the semi-submersible unit is carried out to set forth the measures of reducing error. The exact data from Inclining experiment will ensure the accuracy of the stability calculation.
Rahayuningsih Siti - One of the best experts on this subject based on the ideXlab platform.
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Analisa Stabilitas Berdasarkan Data Teoretis dan Hasil Inclining Test Untuk KM. Sabuk Nusantara 99
2018Co-Authors: Rahayuningsih SitiAbstract:KM. Sabuk Nusantara 99 merupakan kapal perintis dengan kapasitas 1200 GT milik Direktorat Jenderal Perhubungan Laut yang saat ini sedang dalam tahap produksi oleh PT. Adiluhung Saranasegara Indonesia. Kapal ini dirancang untuk keperluan mobilisasi arus barang dan penumpang. Pembangunan kapal perintis dilakukan dalam rangka mengimplementasikan Program Tol Laut yaitu mendukung percepatan pertumbuhan ekonomi nasional dan meningkatkan konektivitas antarpulau di daerah terpencil, terdalam terluar, serta menjamin tersedianya kebutuhan bahan pokok dan tumbuhnya pusat-pusat perdagangan dan industri. Sebagai syarat kelaikan kapal serta untuk menjamin keamanan dan keselamatan kapal saat beroperasi, maka kapal baru seperti KM. Sabuk Nusantara 99 ini perlu untuk dilakukan analisa stabilitas. Dalam pembahasan Tugas Akhir kali ini, analisa stabilitas dilakukan dengan pendekatan secara teoretis dan pengujian kemiringan kapal secara langsung. Pada pembahasan analisa dengan pendekatan secara teoretis, stabilitas kapal diperhitungkan dengan berdasarkan data-data perencanaan awal atau yang sering dikenal dengan istilah preliminary stability. Sedangkan pada pembahasan dengan metode uji kemiringan kapal, stabilitas kapal diperhitungkan berdasarkan data-data yang diperoleh dari pengujian kemiringan (Inclining Test) sehingga bisa didapatkan hasil yang lebih akurat sesuai dengan karakteristik kapal sesungguhnya (final stability). Berdasarkan data teoretis, berat kapal kosong diperkirakan sebesar 741,20 ton dengan LCG 23,797 m dari AP dan KG sebesar 4,88 meter. Sedangkan dari hasil Inclining Test, diperoleh data berat kapal kosong sebesar 831,90 ton dengan LCG kapal sebesar 26,331 m dari AP dan KG sebesar 4,513 meter. Analisa stabilitas pada kedua metode tersebut menggunakan acuan standar dari International Maritime Organization (IMO) Instruments Resolution A. 749 (18) amended by MSC.75 (69) Static stability, serta Biro Klasifikasi Indonesia (BKI). Hasil analisa stabilitas menggunakan dua metode tersebut menunjukkan bahwa kapal telah memenuhi kriteria-kriteria IMO. Secara umum terdapat perbedaan hasil analisa antara preliminary stability dengan final stability dengan rentang antara 0,55% hingga 11,36%. Perbedaan tersebut menunjukkan hasil stabilitas yang lebih baik pada analisa final stability. ========== KM. Sabuk Nusantara 99 is a coaster vessel with 1200 GT capacity belonging to Direktorat Jenderal Perhubungan Laut – RI which is on production process by PT. Adiluhung Saranasegara Indonesia. She is designed to mobilize the flow of goods and passengers in order to implement the Tol Laut Program as we know that Tol Laut Program aims to support the acceleration of national economic growth and increase inter-island connectivity in remote, inside and outermost areas, as well as ensuring the availability of basic commodities and the growth of trade and industry centers. To ensure the safety while operating, new vessels such as KM. Sabuk Nusantara 99 is necessary to be analized the stability. In this Final Project, her stability will be analized by theoretically approaching method or often known as preliminary stability and Inclining Test to analize the final stability. Based on the theoretical data, Lightship weight is estimated at 741.20 tons with LCG 23.797 m from AP and VCG 4.88 m from Baseline. In the other hand based on the result of Inclining Test, we get the Lightship data is 831.90 ton with ship LCG equal to 26.331 m from AP and VCG 4.513 m from baseline. Stability analysis on both methods uses standard reference from International Maritime Organization (IMO) Instruments Resolution A. 749 (18) Amended by MSC.75 (69) Static stability, and Biro Klasifikasi Indonesia (BKI). The result of the stability analysis indicates that the ship has fulfilled all of criterias based on IMO and BKI standard. However there is differentiaton between the result of preliminary stability analisys and final stability analisys in range 0.55% to 11.36% which show better result analisys in the final stability
