Mooring effect on wave frequency response of round shape FPSO

This paper presents the motions response of moored Round Shape FPSO model due to the wave effect. The proposed of this research is analyzed the possibility of model motion response affected by different mooring system attach to the model. Model experiment was applied in this research to collect motion data for the study. Besides, the numerical simulation using diffraction potential, diffraction potential with Morison Heave correction and ANSYS frequency domain study were also applied in this research to generate comparative data to the experimental results. To investigate the effect of the mooring system to motion response, the model experiment was firstly conducted by attached model scale catenary mooring lines to Round Shape FPSO model. After that, the experiment was repeated by attached model scale taut mooring lines to the same model. The results obtain from the regular wave experiment tests and numerical simulation test were presented in this paper. This research concluded that the mooring systems would not give significant effect to wave frequency motion response after compared the motion result obtain from model experiment conducted using different mooring system

An environmental friendly leisure boat

This paper presents a development of an environmental friendly leisure boat. The study seeks to choose appropriate hull form configuration to minimize bank erosion, propulsion system and material to prevent air and water pollution. An asymmetric catamaran hull form configuration was selected and an electric motor with solar cell system was chosen as propulsion systems. GRP material was chosen to get easy maintain and corrosive resistant

Elemen reka bentuk kapal

Buku ini mengandungi beberapa bab iaitu kandungan: prakata, glosari, bab 1 faktor-faktor dalam reka bentuk kapal, keperluan pemilik, corak perdagangan, bab 2 parameter reka bentuk asas, masalah dalam reka bentuk kapal, reka bentuk awal, bab 3 berat kapal-ringan dan anggaran kuasa, penilaian berat kapal-ringan, kaedah untuk berat keluli, bab 4 anggaran muatan kargo, bab 5 ciri-ciri hidrostatik dan kestabilan, pekali bungkah dan sebagainya momen lentur, kaedah membuat anggaran, bab 6 reka bentuk badan kapal, luas keratan tenggelem, luas peminggang, bab 7 penginapan anak kapal dan penumpang, bab 8 pengkelasan, spesifikasi dan kontrak, bab 9 lampung bebas, pemetakan dan tannan, bab 10 pemilihan terhadap jentera pendorong, kuasa stim, disel, bab 11 kuasa dan kipas, bab 12 penyelidikan kapal dan kejuruteraan marin

The wake wash prediction on an asymmetric catamaran hull form

This paper presents results of wake wash prediction on an asymmetric catamaran hull form for leisure craft application. The study seeks to find the effect of hull form configuration and separation to length ratio on wave height produced. Computational Fluid Dynamics simulation was carried out and the results indicate that a novel method of arrangement of the catamaran demihulls as well as their spacing improves the wake-wash characteristics significantly

Teori getaran dengan penggunaan edisi ketiga (UTM – Renong)

Pembaca yang berminat untuk membina pengetahuan yang kukuh dalam teori getaran akan mendapati Edisi Ketiga ini lebih mudah dan berpendekatan terus serta terdapat pelbagai contoh penggunaan masalah kejuruteraan. Di samping memberi penekanan kepada aspek fizikal matematik bagi memperihalkan fenomena getaran, Edisi Ketiga ini turut memasukkan bahan-bahan baru: kerja maya, memanjangkan lagi kaedah tenaga kepada sistem tak konservatif dan saling bersambungan, Kaedah sambutan frekuensi, Kaedah Lagrange, ditulis semula supaya mudah difahami dan memasukkan kaedah analisis ragaman, dan kaedah unsur terhingga untuk analisis struktur kerangka. Juga terdapat pelbagai masalah dengan jawapan terpilih, perbincangan tentang penyelesaian masalah komputer dan formula serta panduan yang siap sedia digunakan. Manual pengajar yang menyediakan penyelesaian kepada semua masalah juga boleh diperolehi

Experimental analysis on the mooring lines force behaviour of semi-submersible in regular waves

The effect of the mooring line force of a typical semi-submersible with square column under regular sea waves for wave heading condition is reported in this paper. A 1:81 scale model of 58748 M.Tonne moored semi-submersible was tested in Marine Technology Towing Tank of Universiti Teknologi Malaysia with 120 m in length, 4 m in width and 2.5 m in depth for the wave frequency from 0.4297 Hz to 1.7189 Hz in steps of 0.1433 Hz. In the tests, model was moored horizontally that are attached to the structure above the water surface level in the head sea with four linear springs forward and aft. Such a system does not have practical usage but is used to study the loading and response of the semi-submersible in the absence of the catenary mooring lines The force or tensions on the mooring lines was measured by load cells. The force measured by the load cells were analyzed to obtain the behavior of the mooring lines force at every frequency step. From the analysis of the experimental results, it is found that among the forward and aft mooring lines, the tension in forward mooring lines is 2 to 4 times more than the tension in aft mooring lines. The mooring forces are not equally shared by forward and aft mooring lines. It also showed that the behavior of all mooring lines forces at each column have a similar trend along the frequency

Effect of stern hull shape on turning circle of ships

Many factors such as: stern hull shape, length, draught, trim, propulsion system and external forces affecting the drift angle influence rate of turn and size of turning circle of ships. This paper discusses turning circle characteristics of U and V stern hull shape of Very Large Crude Oil Carrier (VLCC) ships. The ships have same principal dimension such as length, beam, and draught. The turning circle characteristics of the VLCC ships are simulated at 35 degree of rudder angle. In the analysis, firstly, turning circle performance of U-type VLCC ship is simulated. In the simulation, initial ship speed is determined using given power and rpm. Hydrodynamic derivatives coefficients are determined by including effect of fullness of aft run. Using the obtained, speed and hydrodynamic coefficients, force and moment acting on hull, force and moment induced by propeller, force and moment induced by rudder are determined. Finally, ship trajectory, ratio of speed, yaw angle and drift angle are determined. Results of simulation results of the VLCC ship are compared with the experimental one as validation. Using the same method, V-type VLCC is simulated and the simulation results are compared with U-type VLCC ship. Results shows the turning circle of U-type is larger than V-type due to effect stern hul results of simulation are