The aim of the paper is to describe the influences of conventional and azimuthing podded propulsion on passenger ferry maneuvering, particularly turning circle and zig-zag maneuvers. The MATLAB-simulink program was used to simulate the turning circle and the zig-zag maneuvers. The program was developed based on the mathematical model for ferry maneuvering. The model involved the setting-up of a 4-DOF in a modular of the Mathematical Modelling Group (MMG) of the hull, propellers-rudder or pod system. The simulation includes separating components of the hull equations, propeller-rudder or pod systems as well as the interaction between them. The results indicated that the azimuthing podded propulsion has an advantage for turning circle performance, meanwhile conventional propulsion is beneficial for zig-zag maneuvers. The 1 st and 2 nd overshoot times of conventional propulsion of the sea trial are higher than the simulation; but the turning cirles of the sea trial are lower.
Sampan sebagai alat transportasi pengangkut ikan dari perahu nelayan yang berfungsi untuk menampung dan menangkap ikan di laut lepas. Ikan hasil tangkapan nelayan ini dibawa ke daratan untuk di pasarkan. Dengan kemampuan angkut yang ukuranya sekitar 0,05 GT atau 0,03 GT umumnya tanpa mesin penggerak, peran sampan ini sangat strategis karena tanpa keberadaannya sebagai pembantu perahu nelayan maka akan beresiko terhadap muatan dalam perahu tersebut. Dari hasil pemantauan di lapangan menunjukkan bahwa kadang-kadang sapan mengalami kebocoran saat beroperasi mengangkut ikan. Untuk perbaikan kembali pada papan kulit sampan harus di bawa ke daratan dengan muatan kosong. Teknologi pengeleman kayu dalam air ini akan dapat mengatasi kondisi ini, karena pengeleman sampan dilakukan di saat muatan dalam sampan, tanpa harus dikosongkan/dipindahkan muatan tersebut. Performance lem propant ini akan dapat diketahui bila dilakukan hubungan antara luas permukaan kayu yang berbeda dan mempunyai tebal lem yang bervariasi maka menimbulkan tegangan geser yang berbeda pula. Dari hasil pengetesan pada komponen kayu yang menunjukkan bahwa dengan tebal lem antara 0,01 cm sampai 0,02 cm dengan luas pengeleman (2.4 x 1.9 cm) dibandingkan dengan tebal lem dan luas permukaan pengeleman yang lebih besar telah menunjukkan keungguan dan efisien, karena dengan ketebalan rendah mampu menahan tegangan geser sebesar 662,5 kg/cm4 dan dapat mengelem dan menyambung kayu kulit sampan cm2 yang dalam waktu pengeringan sambung ± 3 jam dari kondisi air dan udara yang normal.
Wave is one of the natural phenomena that gives effect to the cruise ship. The energy produced by the wave is very large that makes the ship turn directions. Therefore the turn has an error coordinates of the starting point of a ship. Deviation of the coordinates has made a further distance and increase fuel consumption, so the operational costs being higher. The research would predict the drift angle, the ship speed and rudder angle to be used after the ship got the influence of wave by taking into account the motion of surge, sway, yaw. Simulations are performed by using Delphi software, with variations of the wind height of 0.5 m, 1 m, 1.5 m, and 2 m, the wave flatness of 0.01, the speed of the wind of 0 and 10 m/s and incoming wave direction 0° - 180° on the side of the ship. It is obtained that the biggest of drift angle happened on 50° wave direction. The biggest of rudder angle happened on 110° wave direction while that fastest ship speed happened on 160° wave direction.
Desa Marabombang, Kecamatan Suppa, Kabupaten Pinrang merupakan sebuah desa yang berbatasan dengan selat Makassar. Karena lokasi geographis yang berbatasan dengan laut ini, maka sebagian penduduk Desa Marabombang berprofesi sebagai nelayan. Berbagai macam alat tangkap digunakan oleh masyarakat desa untuk mendapatkan ikan baik dengan menggunakan kapal maupun dengan bagan. Namun demikian, nelayan Desa Marabombang menghadapi kendala utama dalam melakukan aktivitasnya yakni semakin tingginya biaya bahan bakar atau energi. Untuk itu, pada program pengabdian yang akan dilakukan ini, masyarakat akan diperkenalkan dan dilatih untuk dapat memanfaatkan sistem hibrid genset dan energi matahari atau sistem photovoltaic. Kegiatan ini akan berlangsung selama sekitar 6 bulan mulai dari persiapan sampai penyusunan laporan dan publikasi. Kegiatan utama yang dilakukan pada program pengabdian ini adalah pelatihan dan penjelasan tentang komponen, cara pemakaian dan perawatan, serta hal lain yang berhubungan dengan sistem hibrid genset dan photovoltaic. Selain itu, untuk meningkatkan pemahaman masyarakat, maka kegiatan penjelasan ini akan diikuti dengan praktek langsung penggunaan sistem di bagan yang sudah ada. Dengan kegiatan pengabdian ini, maka diharapkan pemahaman masyarakat tentang penggunaan sistem hibrid genset dan photovoltaic dapat meningkat sehingga masyarakat dapat menggunakan sistem tersebut untuk meningkatkan produktivitas dan kesejahteraan terutama oleh nelayan bagan ikan di tempat pelaksanaan kegiatan ini.
Nowadays, the container transportation service increases rapidly and then this condition emphasizes the container ship growth. The containers stowage only on deck can cause a serious problem subjected to ship stability. The objective of present study is to analyze the stability of a container ship due to containers stowage on deck. Also, twelve cases based on weight conditions C1 to C2 were simulated in order to distinguish the impact of the weight on stability parameters KG, GZ, vanishing stability angle, and stability range. The results show the weight condition affects on the magnitude of KG and LCG wherein the position of centre of gravity point is behind amidship and the decrease of LCG due to the decrease of consumable weight ≥ 50% is average 2.06%. The effect of the decrease of consumable weight ≥ 50% can make stern trim condition (C3, C5, C6, C8, C9, C11, and C12). The containers stowage on deck impacts on reducing the KG as well the magnitude GZ becomes small. In addition, the vanishing stability and stability range become small. Nevertheless, the stability parameters due to the containers stowage on deck fulfil the requirement of Intact Stability Code. Overall KG values due to the weight condition (C1 to C12) are significantly lower than the limiting KG. This means that overall KG due to weight conditions fulfill the stability criterion.
Wave is one of the natural phenomena that give effect to the cruise ship. The energy produced by the wave is very large that makes the ship turn directions. Therefore the turn has an error coordinates of starting point of ship. Deviation of the coordinates has made a farther distance and increase of fuel consumption, so the operational costs being higher. The research would predict the drift angle, the ship speed and large of rudder angle to be used after the ship got the influence of wave. Taking into account the motion of surge, sway, yaw. Simulations performed by using Delphi software, with variations of the height of wind Hw = 0.5 m, 1 m, 1.5 m and 2 m, flatness of the wave = 0.01, the speed of the wind ratio Uw/U= 0 -20 m/s and wave direction coming ψw = 0º -180º on the side of the ship . The biggest of drift angle happened on 50º wave direction. The biggest of rudder angle happened on 110º wave direction while the maximum ship speed happened on 160º wave direction.
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