Analisis Penentuan Safe Working Load Yang Sesuai Terhadap Biaya Pelayaran Minimum Pada Kapal-Kapal Barang Umum Dibawah 2000 DWT Rute Surabaya-Banjarmasin-Balikpapan

Salah satu faktor yang berperan dalam merninimalkan total biaya transportasi kapal adalah biaya pelayaran kapal. Dalam penelitian ini dilakukan analisa terhadap penentuan safe working load (SWL) yang sesuai pada kapal – kapal barang umum dengan ukuran dibawah 2000 DWT untuk mendapatkan biaya pelayaran (voyage cost) minimum. Analisis dilakukan dengan mengambil beberapa sampel kapal dengan rute pelayaran yang sama. Untuk tiap kapal dihitung besar biaya pelayarannya pada tiap pemasangan safe working load yang berbeda - beda. Dengan memanfaatkan metode statistik dan program komputer Microsoft Excel, maka didapatkan persamaan kurva hasil regresi polinornial dari tiap pemakaian SWL terhadap biaya pelayarannya. Dari persamaan kurva tersebut didapatkan koordinat titik ekstrimnya yang merupakan besar biaya pelayaran minimum kapal tersebut untuk pemasangan safe working load tertentu. Dari hasil perhitungan dan analisis pemasangan SWL pada tiap- tiap kapal, maka dapat diketahui berapa besar safe working load yang dapat meminimalkan biaya pelayarannya

Gap Analysis of Ship Design Approval Case Study: Key Plan Drawing Assessment for Dual Fuel Harbour Tugboat

Starting to build the ship, the ship’s designer or builder must prepare key plan drawings with an approval statement that comes from the Classification Society (CS) based on the conformity of key plan drawings to comply with the rules or sometimes do not comply with those rules in several cases, so this situation could be minimized by using a gap analysis technique prior to the approval of the ship design process. Gap analysis is the tool to evaluate whether the design has been conforming to comply with the rules of the classification society or not. This paper chooses some parts of the ship design of a Dual Fuel Harbour Tugboat (DF Tug) to show the level of conformity to the rules. The assessment process involves Biro Klasifikasi Indonesia (BKI) since the DF Tug will be classified by BKI as a competent national classification society. The findings gap is used to improve the design of DF Tug. Finally, the framework of corrections and improvements to the DF Tug design is proposed as part of the refinement of key plan drawings, and the final ship design complies with rules and gets full approval from the classification societ

Dynamic response of high-speed craft bottom panels subjected to slamming loadings

The inelastic deformation of a 30 m high-speed craft (HSC) subjected to slamming pressure is the main topic of this research. In this work, the commercial software package ABAQUS FEA is used to predict the structural behavior, especially in the hull area under the chine. Dynamic explicit solver simulations are done to predict plastic deformation. Before the principal analysis of the actual size of the ship hull structure model, the numerical studies were validated against relevant experimental data from the previous open literature. A reassessment of the design guidelines was also done to forecast the slamming load on the HSC structure. Then, with the slamming load pressure increased to the design limit, a parametric analysis was also conducted with two different idealizations of the pressure type: rectangular and triangular. Finally, this study identifies the variables that must be considered when calculating the degree of structural deformation brought on by slamming loads