Muhammad Iqbal

• M.Eng
• Lecturer at Diponegoro University

Many ship accidents are experienced by small boats. With a large number of small fishing boats in Indonesia, the risk of potential ship accidents is high. Therefore, an operability analysis must be conducted for various loading conditions to address any safety issues due to severe vessel motion. The net cargo of a fishing boat will change during it...

Shallow water infrastructure needs to support increased activity on the shores of Semarang. This study chooses several pontoons because of their good stability, rolling motion, and more expansive space. A coupled simulation method consisting of hydrodynamic and structural calculations has been used to evaluate a catamaran pontoon’s motion and struc...

The design of patrol boats, especially in Indonesian waters with extreme sea conditions, requires good stability capabilities and self-righting moments. These conditions require patrol boats to have anti-capsized capabilities where, with these capabilities, the patrol boat can return to an upright position at extreme heeling angles. This study inve...

Fishing boats have unique features that make them prone to changing loading conditions. When the boat leaves the port, the empty fish tank gradually fills up during fishing operations which may result in parametric roll (PR). This dangerous phenomenon that can lead to capsizing. The present study aims to understand better the behaviour of parametri...

Investigation of hydrodynamic interaction between the vessel and the seabed when entering shallow water is considered one of the most critical considerations of inland waterway transport. There are many investigations into the behavior of ships in restricted waters, such as ships traveling in different forms of canal cross-sections. The present stu...

Experimental test is one of the methods for predicting drag ships using towing tank. This method has a good level of accuracy but requires quite complex equipment and costs. With the advancing technology of computing, the CFD method has emerged as an alternative for problem-solving, especially in hydrodynamics analysis. This study aims to ensure th...

Karakteristik Deep-v planing hull sangat dipengaruhi oleh bentuk dan kecepatan kapal. Bentuk pada haluan kapal akan mempengaruhi performance kapal pada saat kondisi air tenang dan gelombang. Semakin tinggi kecepatan kapal maka akan semakin sulit untuk memprediksi karakteristik kapal tersebut. Pada penelitian ini akan menggunakan pendekatan Computat...

Modifying the hull shape is one of the challenges in designing a ship. The angle of the ship's entrance is a significant determinant of the total resistance of the ship. This research aimed to analyze the total resistance of the ship due to changes in the shape of the ship's bow. This research used the Computational Fluid Dynamics (CFD) method with...

Drag is one of the main factors in improving fuel efficiency. Various study in regards to improve drag performance of a planing hull amongst them is a stern flap. The main parameters to design a stern flap are span length and angle of stern flap. The stern flap works by changing pressure distribution over the ship's bottom and creating a lift force...

The sloshing phenomenon is one challenging event in fluid-structure interaction especially for the liquid carrier such as a ship. Sloshing can endanger ships when there is energetic sloshing with volatile liquid inside the tank. One of the LNG carriers is membrane type which the tank is prismatic. The study aims to reproduce long-duration sloshing...

This paper discusses the use of foil-shaped center bulb in catamaran fishing vessels, where the length, width, and height of the center bulb were configured into six variations. This study aims to get the best configuration that can most reduce the total resistance of catamaran fishing vessels. Ship resistance was tested at Fr 0.15 to Fr 0.35 using...

There are many aspects to analyze seakeeping performance, one of which is the ship's vertical motion. As well-known, vertical motion and its derivatives, vertical velocity and acceleration, will be related to other aspects of seakeeping performance, such as slamming, deck wetness, and MSI. This study discusses optimizing the hull shape with small v...

Aspek paling penting pada proses desain kapal cepat adalah memprediksi hambatan, trim dan perubahan titik gravitasi. Prediksi hambatan total harus memiliki akurasi yang baik untuk meningkatkan efisiensi dalam desain kapal cepat,. Pengujian eksperimen menggunakan towing tank adalah salah satu cara yang digunakan untuk memprediksi hambatan kapal. Met...

The sloshing phenomenon is one of the free surface flow that can endanger liquid cargo carriers such as ships. Sloshing is defined as the resonance of fluid inside a tank caused by external oscillation. When sloshing is close to the natural frequency of the tank it could endanger ships. Particle method has the advantages to be applied because slosh...

Catamarans are double hull ships which have many advantages over single hull ships with the same displacement. To increase catches, fishermen in Cilacap converted ships from the original single hull with outrigger to double hull (catamaran). Displacement of ships has doubled. But the ship's resistance increased to almost 4 times. To reduce the resi...

This paper discusses an experimental study of a wave energy converter (WEC) without using reaction from the seabed. The WEC uses buoys and heave plates, which can react to their self-reacting. The interaction force between heave plates and buoys can absorb energy from ocean waves better. The heave plate model affects the output of energy produced....

Menurunkan gerakan rolling kapal merupakan hal penting untuk meningkatkan keamanan dan kemudahan kapal dalam beroperasi. Salah satu cara meminimalisir rolling pada kapal adalah menambahkan sistem anti-rolling. Pada penelitian ini, dilakukan analisis Koefisien Damping anti-roll jenis passive tank dengan pengaturan tinggi fluida di dalam tangki jenis...

A catamaran is a ship with two identical hull forms, which on this type of vessel it has interferences in between its hulls. These interferences cause resistance and a popular topic to research. Multiple factors can cause these interferences, such as the wrong approach to design the hull forms and to set the distance between hulls. On reducing the...

Kelebihan kapasitas muat (overload) dapat menyebabkan kecelakaan atau tenggelamnya kapal. Batas kapasitas muat dalam eksploitasi kapal seringkali tidak dihiraukan demi meraup untung besar. Penelitian ini bertujuan untuk melihat batas overload yang masih aman pada kapal penyeberangan di Pelabuhan Kali Adem-Kepulauan Seribu. Metode yang digunakan ada...

Traditional fishermen in Cilacap modify a monohull fishing vessel to be a catamaran. With the same draft, the capacity increases two times while the resistance increases almost four times than original monohull due to low S/L. The wave interference between hulls caused by low S/L increases the wave resistance leading to fuel consumption problem. Th...

Capsizing merupakan salah satu masalah yang terjadi pada kapal yang memiliki manuver tinggi. Hal tersebut berkaitan dengan gerakan rolling kapal dimana ketika nilai amplitudo rolling kapal terlalu besar maka akan menyebabkan terjadinya Capsizing. Gerakan ini akan berpengaruh terhadap kenyamanan dan keselamatan sebuah kapal. Dalam upaya menurunkan g...

https://ejournal3.undip.ac.id/index.php/naval/article/view/18842

The purpose of this study is to find out the results of measurements of floating structure motion response to regular waves using open source microcontrollers produced by wave makers. A direct measurement is carried out in real time using Arduino Mega Microcontroller with an MPU-6050 IMU sensor and HC-SR04 sensor, and the wave maker in towing tank...

The purpose of this study is to find out the results of measurements of floating structure motion response to regular waves using open source microcontrollers produced by wave makers. A direct measurement is carried out in real time using Arduino Mega Microcontroller with an MPU-6050 IMU sensor and HC-SR04 sensor, and the wave maker in towing tank...

ABSTRAK Kapal multihull, terutama catamaran adalah kapal yang menarik untuk dikaji. Dalam segi stabilitas catamaran memiliki stabilitas kapal yang lebih baik, tetapi permasalahan yang sering timbul terkait masalah hambatan. Hambatan catamaran lebih kompleks dibandingkan dengan kapal monohull. Permasalahan yang timbul akibat efek interaksi komponen...

This study aims to prove the usefulness of a bulbous bow traditional catamaran fishing vessel. Bulbous bow applications are widely used to reduce wave resistance. The fishing vessel resistance was calculated using CFD (Computational Fluid Dynamic) approach and combined with classical slender body theory. In this research, the application of bulbous...

Ship resistance is one of the main factors affecting the design of a ship. Catamaran boat is a ship with small wet surface area that able to reduce drag and improve ship power. Generally, a bulbous bow is implemented to reduce wave resistance because the bulbous shape is believed to attenuate the bow wave system. Additionally, the bulbous bow also...

Catamaran resistance is very complex compared to monohull resistance, so it is particularly worthy of research. The below-water-level hull form influences the fluid flow characteristics around the ship, which either increases or decreases the total resistance. This study focuses on developing a new hull form by using the Lackenby Method to modify a...

Analisis seakeeping (kemampuan olah gerak kapal) merupakan aspek penting dalam perancangan kapal. Berdasarkan analisis tersebut, dapat diketahui batas operasional dari sebuah kapal. Salah satunya adalah dapat mengetahui kemampuan kapal pada tinggi gelombang signifikan (Hs) tertentu. Memodifikasi bentuk haluan kapal dengan membuat dasar dari haluan...

Resistance or drag is one of the most important factors in ship design, in particular in connection with the development of more efficient and environmentally friendly vessels. The shape of the hull under water will affect the fluid flow characteristics around the ship, hence causing the resistance to increase or decrease. If the resistance increas...

Prediksi performa seakeeping (olah gerak) kapal di perairan tertentu adalah salah satu dari aspek-aspek penting pada tahap perencanaan kapal. Penelitian ini fokus pada optimasi bentuk demihull kapal untuk meningkatkan kualitias seakeeping sesuai dengan standar kriteria umum seakeeping untuk kapal militer. Bentuk lambung demihull yang digunakan adal...

Research, in order to breakdown the resistance components of multihull (catamaran and trimaran) form, has been carried out worldwide. Almost all of the work is focused on the resistance investigation in deep sea condition. The current work is concentrated on the investigation of the effect of water depth, namely deep, medium and shallow waters, int...

Research, in order to breackdown the resistance components of trimaran hull form, has been carried out worlwide. Almost all of the work is focused on the resistance investigation of trimaran configuration in deep sea condition. None of the research has formulated the estimation of trimaran resistance components into certain equation such as for cat...

The amounts of research about catamaran have generated a practical formula to simplify the calculations of catamaran resistance. Ship designer will calculate the predictions of catamaran resistance rapidly. The aim of this research is focused to search the optimal demihull form where the hull form has the lowest resistance compared to other hull fo...

The existence and the use of live fish hold system, can help fishermen to reduce the operating costs in fish preservation 11.8%. The live fish hold system, which fish hold were given circulation hole so the water inside and outside the hatch is connected, there should be researched about the changes and differences in pressure that happened when th...