Fast Patrol Boats Research Articles

Effect of bilge keel variations on the designed fast patrol boats to hull resistance and stability behaviours

This study aims to analyse the effect of variations in the addition of bilge keel on the value of resistance, ship stability, and seakeeping performances. The research method is carried out by designing and analysing the hull design of the fast patrol boat type with variations in the addition of a bilge keel. Variations made on the bilge keel include length and width. The length variations are considered by applying 4 m, 5 m, and 6 m, while the variations in width include 0.3 m, 0.4 m, and 0.5 m. This study indicates that the nine variations of the bilge keels model with a combination of length and width do not show a significant difference in the resistance value on each ship. Then, for the stability criteria, the bilge keel model IX, with a length of 6 m and a width of 0.5 m, has the best stability value compared to other variations. Meanwhile, the addition of bilge keel in the seakeeping simulation did not show a significant difference. The parameters of this analysis consider the primary needs of fast patrol boats to support the development of shipping technology.

STUDY OF FAST PATROL BOAT MODELS WITH AND WITHOUT TUNNELS ON THE EFFECT OF RESISTANCE USING COMPUTATIONAL FLUID DYNAMICS

Indonesia as an archipelago countries demand modern boats for marine security, resulting in a surge in the development of past patrol vessels. The investigation in this study focused on designs with and without a tunnel at the bottom to determine which design provided the least resistance. CFD offer realistic findings for comparing the problems encountered by two distinct kinds of fast patrol boats. The computation the use of no tunnel, the use of a tunnel on fast patrol boat reduced resistance by an average of 5.4%. According to the results of the CFD simulations, using a tunnel may greatly reduce the high pressure at the bottom in interactions with the flow of water. The utilization of using tunnel is a solution that may be employed more successfully for fast patrol boat operation

Design of Fast Patrol Boat for Improving Resistance, Stability, and Seakeeping Performance

Indonesia is the largest archipelagic country and has the potential to become the world’s maritime axis. Two-thirds of Indonesia’s territory is ocean, with a total coastline of 54,716 km. Therefore, Indonesia must have solid systems and tools to overcome the various threats in the maritime sector. One of the technologies that can be developed to protect Indonesia’s naval territory is fast patrol boats. Indonesia requires efficient patrol boats that can optimally monitor the large Indonesian sea area and various potential threats in the maritime sector. Thus, research on the hydrodynamic criteria for the hull design of patrol boats is fundamental. In this study, we aimed to evaluate the design method based on hydrodynamic characteristics to obtain the primary dimensions and shape of the ship’s hull. We designed and analysed 11 ship models in terms of the following criteria: the resistance, stability, and seakeeping performance. The 11 models included five reference models of patrol boats with varying dimensions and block coefficients between 0.42 and 0.53, three ship models with the regression method with the exact dimensions and block coefficients between 0.45 and 0.46, and three ship models with the scale method with the exact measurements and block coefficients between 0.43 and 0.45. According to the analysis results, the regression method had better total hydrodynamic criteria and greater similarity to the reference vessel. With a shorter processing time, the regression method was more efficient than the scaling method and reference ship.

Investigation of the effectiveness of a stern foil on a patrol boat by experiment and simulation

In the marine industry, specifically fast patrol boats, the important objectives are reducing resistance and improving the efficiency of ships’ propulsion systems. The aim of this research was to i...

PERANCANGAN RC (REMOTE CONTROL) BOAT PATROL 80 CM DENGAN PROPULSI WATERJET

The government is still struggling to secure all the waters of the archipelago in maintaining and overseeing the security of its territory. This is due to the many islands that need human resources (HR) and require a lot of high-tech ships. So it is necessary to design a robot Electric Remote Control Waterjet Patrol 80 (ERC_WP 80) which could serve as patrol boats and destroyers. Waterjet propulsion drive system has a motion if the vessel was excellent at relatively high speed boats and has good acceleration capabilities. Boats with jet propulsion system can operate in very shallow waters. This is due to all parts of the engine located under the hull, including propeller, shaft and shaft house. Waterjet advantages compared with the steering system / rudder is conventional waterjet propulsion system is able to turn the steering wheel with a smaller angle. Maneuverability and good seakeeping of a ship is strongly influenced by the shape of the hull. Selection of the hull shape is designed to perform parametric studies hull of the vessel Fast Patrol Boats comparator (KPC) 14 1 228 m and the vessel JS Patrol. On the back of the boat is made with a slope angle (chine angle) of about 20 degrees in order to gain the necessary lifting force without reducing the stability of the ship. While at the front end of the ship made a slope angle of about 30 degrees with the intent facilitate ship moving at high speed and reduce the impact when the waves break. Unmanned patrol boats are designed using radio control GensAce 4S 3300mAh

Application of aerospace structural models to marine engineering

The large container ships and fast patrol boats are complex marine structures. Therefore, their global mechanical behaviour has long been modeled mostly by refined beam theories. Important issues of cross section warping and bending-torsion coupling have been addressed by introducing special functions in these theories with inherent assumptions and thus compromising their robustness. The 3D solid Finite Element (FE) models, on the other hand, are accurate enough but pose high computational cost.In this work, different marine vessel structures have been analysed using the well-known Carrera Unified Formulation (CUF). According to CUF, the governing equations (and consequently the finite element arrays) are written in terms of fundamental nuclei that do not depend on the problem characteristics and the approximation order. Thus, refined models can be developed in an automatic manner. In the present work, a particular class of 1D CUF models that was initially devised for the analysis of aircraft structures has been employed for the analysis of marine structures. This class, which was called Component-Wise (CW), allows one to model complex 3D features, such as inclined hull walls, floors and girders in the form of components. Realistic ship geometries were used to demonstrate the efficacy of the CUF approach. With the same level of accuracy achieved, 1D CUF beam elements require far less number of Degrees of Freedom (DoFs) compared to a 3D solid FE solution.

IMPROVEMENT OF THE PROCESS OF NEW BUSINESS OF SHIP BUILDING INDUSTRY

Shipbuilding industry is an industry group which has high risk. For that reason, the managementshould include risk assessment. The production process of new buildings in theshipbuilding industry is grouped into three major parts, namely the work of design, materialprocurement and production processes. Each stage of the production process will bring therisk and will accumulate on the overall risk. If the risk is not anticipated, the possibility ofdelays in the production process will be even greater. Risk assessment performed on eachproduction process by using a probabilistic approach to the principle of multiplication in thetheory of opportunity. Risk analysis performed on the construction of fast patrol boats was inthe construction number 268, 269 and 270 on the PT. PAL Indonesia. From the analysis, itwas obtained the greatest probability of occurrence of sequential delay which is in the processof the material, the production, and design group. The potential for loss is due to the riskof unanticipated costs due to factors affected by delays in production processes. Performancefactors are still required for further study.

Pregnancy Outcomes After Paternal Radiofrequency Field Exposure Aboard Fast Patrol Boats

To investigate adverse reproductive outcomes among male employees in the Royal Norwegian Navy exposed to radiofrequency electromagnetic fields aboard fast patrol boats. Cohort study of Royal Norwegian Navy servicemen linked to the Medical Birth Registry of Norway, including singleton offspring born between 1967 and 2008 (n = 37,920). Exposure during the last 3 months before conception (acute) and exposure more than 3 months before conception (nonacute) were analyzed. Perinatal mortality and preeclampsia increased after service aboard fast patrol boats during an acute period and also after increased estimated radiofrequency exposure during an acute period, compared with service aboard other vessels. No associations were found between nonacute exposure and any of the reproductive outcomes. Paternal work aboard fast patrol boats during an acute period was associated with perinatal mortality and preeclampsia, but the cause is not clear.

Radiofrequency exposure on fast patrol boats in the Royal Norwegian Navy—an approach to a dose assessment

Epidemiological studies related to radiofrequency (RF) electromagnetic fields (EMF) have mainly used crude proxies for exposure, such as job titles, distance to, or use of different equipment emitting RF EMF. The Royal Norwegian Navy (RNoN) has measured RF field emitted from high-frequency antennas and radars on several spots where the crew would most likely be located aboard fast patrol boats (FPB). These boats are small, with short distance between the crew and the equipment emitting RF field. We have described the measured RF exposure aboard FPB and suggested different methods for calculations of total exposure and annual dose. Linear and spatial average in addition to percentage of ICNIRP and squared deviation of ICNIRP has been used. The methods will form the basis of a job exposure matrix where relative differences in exposure between groups of crew members can be used in further epidemiological studies of reproductive health.

La teoría de la actividad como soporte para el diseño de equipos de navegación

This study reports on the use of Activity Theory as a supportive framework in a design process. Crews on Fast Patrol Boats in the Royal Norwegian Navy were observed during high-speed navigation in coastal waters. The unit of analysis was the navigation team of five persons in their work. Activity was regarded as situated actions shaped by tools, objects and constraints. The framework of Activity Theory was used to form a design language that encompassed the aspects relevant to design and navigation. Based on the findings, a prototype of a automated steering system was built. We suggest that in design process, Activity Theory moves the focus from the technical qualities of artefacts towards how artefacts are used as tools to mediate activity.

An integrated framework for task analysis and systems engineering: approach, example and experience

Analysis and modelling of human-machine systems during the early phases of development are discussed in this paper. Analysis and simulation of a comprehensive discrete event behavioral model and a component model, including both human and machine parts, are emphasized. A model language called behavior graphs is described and its characteristics are discussed. Organizational aspects in a Command, Control, Communication and Information system for fast patrol boats are discussed as an example on how the modelling and simulation approach can be employed in a complex human-machine system development. The advantages and problems with employing such an approach are outlined.

A decision support simulation model for design of fast patrol boats

This paper gives an outline of a simulation model that will provide decision support in the complex process of designing a new generation fast patrol boats. Decision support in this context implies evaluating the effectiveness of different concepts for fast patrol boats in their primary role. The model addresses effectiveness issues at the tactical level, emphasizing a realistic and flexible representation of operations of a fast patrol boat squadron rather than individual boat operations. Main elements of the model are presented in some detail.

A simulation model to evaluate air defence systems of fast patrol boat squadrons in realistic tactical situations

An outline of the general nature of the problem and the aim and structuringof the simulation model is given. The main modes of operation of the Fast Patrol Boats are derived from their primary role as a major component of the R No Navy's anti-invasion capacity. This, coupled with assumptions regarding enemy anti-FPB operations in the air, based on given scenarios, define the tactical situations subject to simulation by the model. Main emphasis, however, is given to discribing the main features of the model itself, starting with the types and the number of units involved, their configuration and performance and how their various modes of operation are represented in the model. A detailed digital terrain description incorporated in the model warrants a realistic consideration of terrain masking in a stochastic dynamic simulation process both for the mutual detection phase and the ensuing combat. A few specific model elements, portraying the detection mechanisms and one of the air defence systems are described somewhat more thoroughly in order to demonstrate the level of detail in the actual model. Finally an example is given to illustrate the type of results that can be generated by this model-system, followed by a general discussion of how such results can be utilized to evaluate alternative air defence concepts on the basis of effectiveness and cost figures.