Analisis Pengaruh Gerakan Kapal Terhadap Bottom Impact Studi Kasus : Kapal Corvette

Ahmadi, Rijal (2017) Analisis Pengaruh Gerakan Kapal Terhadap Bottom Impact Studi Kasus : Kapal Corvette. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Suatu kapal yang berlayar, dalam operasinya sangat dipengaruhi oleh kondisi laut terutama besar kecilnya gelombang. Gelombang tersebut menyebabkan kapal mengalami gerakan rotasi dan translasi dimana gerakan tersebut dapat menimbulkan fenomena-fenomena lain seperti slamming terutama pada kapal yang beroperasi dengan kecepatan tinggi. Tugas akhir ini bertujuan untuk menganalisis besarnya impact atau beban sesaat yang terjadi ketika slamming pada kapal perang tipe corvette. Beban dihitung dalam bentuk pressure pada station 19-23 yang berada di daerah haluan kapal dengan 5 variasi gelombang yaitu sea state 3-7. Kecepatan kapal yaitu 30 knot dan 15 knot dengan sudut hadap 180o terhadap arah gelombang. Analisis gerakan kapal dilakukan dengan software Ansys AQWA dan selanjutnya dilakukan perhitungan dengan pendekatan numerik untuk mendapatkan besarnya probabilitas slamming, intenistas slamming, kecepatan relatif, akselerasi relatif, dan juga bottom impact akibat slamming. Dari hasil analisis didapatkan bahwa nilai probabilitas slamming, intensitas slamming, kecepatan relatif, akselerasi relatif, dan bottom impact meningkat seiring meningkatnya sea state dan kecepatan kapal. Nilai maksimum yang didapatkan yaitu probabilitas slamming (0.510), intensitas slamming (344) dalam satu jam, kecepatan relatif (5.754 m/s), dan akselerasi relatif (10.732 m/s2) yang mana terjadi di station 23, sedangkan bottom impact maksimum (474.28 kN/m2) terjadi di station 19. Nilai bottom impact pada kecepatan 30 knot tidak melebihi design bottom slamming pressure BKI sebesar (292.747 kN/m2) sampai sea state 6 sedangkan pada kecepatan 15 knot semua kondisi sea state 3-7 tidak melebihi design bottom slamming pressure BKI. ========================================================= When a ship sails, it is greatly affected by the sea condition, particularly by the height of the wave. The wave will cause the ship encounters rotational and translational motions where these motions can cause some phenomena that notably happen to a high-speed craft, such as slamming. The purpose of this final project is to analyze the impact pressure that works when the slamming occurs on corvette warship. The pressure are calculated at the station 19 - 23 that are located in the bow of the ship with 5 seawave’s variants, which are sea state 3 - 7. The speeds of the ship are 30 knot and 15 knot with the heading angle of 1800 againts the wave direction. The motion of the ship is analysed using Ansys AQWA software and using numerical approach calculation as the next step to determine the probability of slamming, the intensity of slamming, the relative vertical velocity, the relative vertical acceleration and also the bottom impact caused by slamming. Based on the analysis, the results show that probability of slamming, intensity of slamming, relative vertical velocity, relative vertical acceleration and bottom impact are increasing along with the increase of the seastate and the speed of the ship. The maximum value of probability of slamming is (0.510), intensity of slamming is (344) in one hour, relative vertical velocity is (5.754 m/s) and the relative vertical acceleration is (10.732 m/s2) that are located at station 23, meanwhile the maximum bottom impact with the value of 474.28 kN/m2 is located at station 19. The values of bottom impact with the speed of 30 knot are not greater than design bottom slamming pressure from BKI with the value of 292.747 kN/m2 until sea state 6, meanwhile at the speed of 15 knot, the values of bottom impact in all condition of the sea state 3 to 7 are not greater than design bottom slamming pressure from BKI.

Item Type: Thesis (Undergraduate)
Additional Information: RSPe 623.84 Ahm a
Uncontrolled Keywords: Kapal Corvette, Slamming Impact, Sea State, High-Speed Craft
Subjects: V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM293 Shipping--Indonesia--Safety measures
Divisions: Faculty of Marine Technology > Naval Architecture and Shipbuilding Engineering > (S1) Undergraduate Theses
Depositing User: Rijal Ahmadi .
Date Deposited: 12 Feb 2018 03:59
Last Modified: 06 Mar 2019 02:34
URI: http://repository.its.ac.id/id/eprint/47517

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