Analisis Numerik Pengaruh Kecepatan Terhadap Seakeeping Kapal Patroli Pada Daerah Pelayaran Seastate 7

Abstract

Patrol boat is designed not to be slow in its movement on the water surface. To be able to move quickly and agilely, the most important requirement for this type of ship is in its maneuverability. The ship's motion at sea (seakeeping) is influenced by several things, speed, body shape, and the direction of the ship's heading waves. In this study, we analyze the six degrees of freedom, especially on the response of the ship's vertical movement, namely rolling on the sea waves of Seastate 7, especially in extreme weather in the South China Sea. The standard limit used is NORDFORSK 1987 with Light Manual Work Criteria. By entering parameters such as variations in speed and wave angle, such as 0°, 45°, 180° and 270°, then from the graph it can be seen the critical value for each movement. The calculation is carried out with the help of computational software Maxsurf Motions Advanced 20 V8i. The results of this study are the maximum roll movement value that occurs at a speed of 14 knots with a wave angle of 45° with a roll angle value of 6.40o. Furthermore, there is a decrease in the value of the movement along with the increase in the speed of the ship. The minimum roll value occurs when the wave angle is 270° when the ship's speed is 28 knots with a value of 5.69o.

Optimasi Variasi Jumlah Blade Inlet Turbo dan Outlet Turbo Terhadap Gaya Dorong Pada Prototype Waterjet Thrusther Produk 3D Printing Menggunakan Metode Taguchi

“…Kemampuan khusus yang wajib dimiliki sebuah speedboat patroli adalah kemampuan bermanufer yang baik untuk melakukan pengejaran terhadap musuh [5]. Umumnya mesin yang digunakan untuk menggerakkan speedboat adalah mesin tempel yang terletak di bagian belakang kapal [6].…”

Variability Analysis of Significant Wave Heights and Wind Waves in Riau Archipelago Sea Part Alki 1

“…West season (Figure 8A West Season (Figure 9A and 9B) show the direction SWH occurs from northwest to north and ranges value SWH from 0.8 to 1.5 m. This season, the SWH value is highest than in other seasons. This is caused by the factor of the length of the wind blowing (wind duration), the magnitude of the duration of the wind is due to the northern area of the Karimata Strait directly adjacent to the South China Sea and the Pacific Ocean (Jumarang, 2015).…”

“…The first transitional season (Figure 9C, 9D, and 9E) shows a range value SWH from 0.5 to 0.75 m. SWH is significantly the lowest than other seasons. This is influenced by the dominant wind direction that occurs varies and the duration of the wind is shortest than in other seasons (Jumarang, 2015).…”

“…This is caused by the factor of the length of time the wind blows from the dominant wind direction. The long duration of the wind is due to the dominant wind direction from the southeast coming from the Java Sea, so the wind blows no obstacles from the mainland (Wyrtki, 1961, Jumarang, 2015, Muliati et al (2018), Anggara et al (2019.…”

“…This is due to the shorter duration of the winds than the west and east monsoons, although the difference in wind speed is not that great. so that the minimum fetch formed is shorter (Jumarang, 2015).…”