Effectiveness of Crew Boat Hull Form on Manouvering Performance

The condition of the crew boat is good hull shape with good operational conditions when maneuvering. In this case, the condition of the waveform at sea will have a significant impact on the ship’s motion. To provide the optimal type of hull, it was developed by conducting several simulations on the ship’s motion. Several simulation conditions were carried out, including analyses of ship speed, the shape of the waves formed, and ship maneuvering. At the simulation stage, several types of hulls were carried out, including the single U-hull, the single V-hull, the trimaran, and the catamaran. The simulation limits the length of the ship but not the width of the ship because the conditions in the multi-hull require sufficient space for its width, so that it can be ascertained that it provides effective and efficient results for the selection of the shape of the hull. The simulation analysis carried out provides a recommendation that the single V hull model gives good results compared to other types of hull selection for crew boat hulls.


Introduction
One of the most important aspects in ship design and manufacturing is to have good maneuverability and a high effectiveness value.The shape of the ship's hull has a significant impact on its maneuverability (Molland).The optimal shape is indispensable so that the maneuvers on the ship are excellent.Good, decent, and safe maneuvering on the ship can be interpreted as saying that the ship has a high level of stability, minimal resistance, optimal speed, good movement ability, and can provide comfort for passengers.To achieve good maneuverability, the ship's construction planning must be good, starting from the design of the ship's body, propeller system, and rudder system (Evans).There are many kinds of shapes on the hull, including the single U-hull, single V-hull, trimaran, and catamaran.The shape of the hull largely determines the effectiveness of the ship's maneuvering (Fyson).The weather on the sea is changing and has large waves, so high maneuvering on the ship is very necessary so that the ship can split the sea waves well with the most effective power and fuel, and can improve the ship's ability to carry out its duties such as delivering people quickly and safely offshore, chasing and ambushing enemy ships, and being an emergency ship to deliver patients (Fossen).Sea waves are generally produced by the movement of winds (sea waves) which make certain wave properties influenced by wind, the stronger or higher the wind speed, the greater the speed and wavelength will also be (Mansour).There are several criteria classified according to the BMKG, namely more than 1.25 meters are classified as dangerous for fishing boats, more than 1.5 meters are classified as dangerous for 2 budianto@ppns.ac.idIOP Publishing doi:10.1088/1755-1315/1265/1/012017 2 barges, more than 2.5 meters are classified as dangerous for ferries, and above 4 meters are classified as dangerous for cargo and cruise ships (Manning).
In order to find the shape of the hull that has the most effective and efficient maneuvers.As a result, several simulations of the ship's motion are required, including the analysis of the ship's speed, the condition of the formed waveform, and the ship's maneuvers.Simulated hull shapes include the single U-hull, single V-hull, trimaran, and catamaran (T.W. Budianto).Based on the description above, in this writing, we will discuss the effectiveness of crew boat hull shape against maneuver performance, so that simulation and analysis are needed for the selection of the most effective and efficient hull shape (Harvald).

Crewboat's Linesplan Materials
The method of this research is to conduct a survey and collect information about the main activities of loading and unloading ships docking at the pier, the number of cranes used, the current crane formation (before improvement) and problems in the operation of containers.After that, create a discrete simulation model, this model operation of a system is represented as a chronological sequence of events (tama et al, 2020).Every event happens instantly in time and marks a change in status in the system.Discrete event simulation is an experimental approach that is often used; allows a high level of detail to be modelled because assumptions about buffer space, processing time distribution, or priority delivery can be modelled that will be developed using Simulation Software that has inputted entities, activities, and model resources according to their actual activities.Discrete event simulation, the system is modeled through a series of queues and activities (Choi and Donghun, 2013).
Crewboat to be made using aluminum material with code Almn 5033.This crew boat is designed using maxsurf modeler software with several forms of the hull including Single U-Hull, Single V-Hull, trimaran, and catamaran (Larissa Queiroz Minillo).The linesplan of the hull shape is shown in figures 1 -4.And with the main sizes shown in tables 1 -4 (Budianto).

Methods
The method carried out is to simulate resistance in the four hull shapes with the holtrop and savitsky calculation methods.

Savitsky Calculation
On fast boats, the formula used to calculate the total resistance of the ship is to use Savitsky's formula (Mansour).From the results of Savitsky's analysis, there is a hydrodynamic resistance formula   5 and 6 show diagrams and wave simulations after resistance tests were carried out on the hull of a single V-hull shape.And in Table 5 is the data of the test results and also the required engine power (ITTC).

Single U-HULL
Figures 7 and 8 show diagrams and simulations of waves after resistance tests were carried out on the hull of the single U-hull shape.And in Table 6 is the data of the test results and also the necessary machine requirements.7 is the data of the test results and also the necessary machine requirements.8 is the data of the test results and also the necessary machine requirements.

Conclusions
From the analysis carried out, the conclusions obtained are from the four hull shape modifications, namely single V-Hull, Single U-Hull, Trimaran, Catamaran.Obtained the hull that has the most efficient and effective manoeuvring value is the hull with a single V-Hull shape.

Table 1 .
The main size of the crew boat with a single V-hull shape hull.

Table 4 .
The main size of the crew boat with a trimaran shape hull.

Table 5 ,
the results of the resistance test and the required engine power

Table 6 ,
the results of the resistance test and the required engine power Catamaran Figures 9 and 10 show diagrams and wave simulations after resistance tests were carried out on the hull of the catamaran shape.And in Table

Tabel 8 ,
test results of resistance and engine power required