"Analysis of Drag Forces Components at the Hull of a Coast Vessel for Fishing Research and Oceanography"

Transcription

1 NATIONAL UNIVERSITY OF ENGINEERING College of Mechanical Engineering "Analysis of Drag Forces Components at the Hull of a Coast Vessel for Fishing Research and Oceanography" authors: Bill Erick Castillo Rupay, Alex Escobar Pumarrumi Courset: Naval Engineering Laboratory Adviser: Eng. David Amaya Nicanor Fuertes SUMMARY In this research the hydrodynamic properties for a hull of a boat fisheries research analyzed two possible optimal dimensions of which one Maxsurf simulation is performed to obtain the values of drag are obtained. It is also described on fishing gear that is made in this type of vessel to take samples of study, for which a network analysis and influence on the resistance to advancement of scientific vessel is made. 1. INTRODUCTION Drag on a boat defines the power you need to install and affects the required speed, which is why it is extremely important to calculate this resistance as it affects the boat and how we can optimize it so we can reduce to the maximum and get the best sailing conditions. A boat fisheries research is dedicated to collecting marine samples, study of fish and other marine flora, is why has certain attachments that allow you to perform their task properly, these elements also add the value of resistance progress, key elements such as fishing net, a lot increases drag and has direct influence on the maneuvers of the boat. To find the optimal size and shape of a boat that meets the requirements for research IMARPE the Peruvian sea, it takes a database of vessels of similar size around the world. Then a comparison is made between the main features of the vessels and two models for analyzing were taken. The first model is considered a boat length L = 15m with a sleeve B = 5.4m to optimize the draft opt for double hull design (catamaran) with Cb = 0.6. Analyzing the resistance of this model we obtain a total of 278.6EHP with a speed 8.2knots For the second model we consider a boat length L = 18m with a sleeve B = 6.5my a prop D = 1.6m. Doing the analysis it is obtained for a speed of 20nudos total resistance is obtained EHP with cruising speed of 8nudos. The study of resistance to the advancement studying full fishing gear and the influence it has on the hydrodynamics of the vessel. 2. CURRENT PROBLEM Scientific vessels have to meet certain special conditions and have elements and forms of boating and fishing different from a conventional vessel is why the study of the hydrodynamic properties of the vessel is required to determine the optimal size to design a scientific vessel, also get an idea of how it affects fishing net, which is used for taking marine samples to determine the drag

2 3. OBJECTIVES General: Analyze the hydrodynamic properties and determine the optimal dimensions for a scientific vessel and calculate the drag, also known fishing gear for such vessels and the influence of elements such as fishing net in drag. specific: Calculate the drag of a preliminary design. Knowing the influence of fishing net in drag. Knowing fishing gear in scientific marine vessels for taking samples. 4. DESCRIPTION OF THE SOLUTION For the design of a multihull boat catamaran type have a better use of area covered by displacement ton, which is what is required for a proposed research vessel. In addition to this a better maneuverability and stability that adds a monohull. As for application of such craft are particularly suitable in the size range of 45 to 170 feet, which offer many of the advantages of conventional ships, that is to say that the length of the proposed design must be within that range. To design the boat the following analysis of aspect ratio according to vessels of this type already built the world will. ESLORA (m) FIRST MODEL: L VS B y = x MANGA (m) According to the database of vessels of this type, and according to the requirement of IMARPE- PAITA, he worked for a length of 15 meters, based on this measure according to the graph shown serious sleeve 5.41 m, defining and a beam of 5.4 m with a strut 1.7 m, as looking less wet surface, for which a lower draft is busaca. Based on the paper "Development of Fishing Vessel Catamaran" it was taken as reference a symmetrical catamaran be designed to have less drag. Modeling software so the Maxsurf and conducting an analysis to find an optimal depth this would be for a broth of 0.52 m has a 0.6 Cb. embarkation flag L (m) B (m) T (m) VELOCITY RV Keary Ireland kn. Wildcat 60 Ireland kn. Kingbay China kn. SBNMS USA kn. The Princes United Royal Kingdom kn. King County USA kn. SOCIB Spain kn. KEY FEATURES LENGTH SLEEVE STRUT CALADO CRUISING SPEED SPEED MAX. 15 m 5.4 m 1.7 m 0.52 m 8.2 knots 21 knots

3 2. SECOND MODEL: Based on the same lines of the first shape model, but modifying its dimensions with the help of the equation obtained from the data. For a length of 18 meters, based on this measure according to the graph shown serious sleeve 6.48 m, thus defining a beam of 6.5 m with a strut of 1.6 m, as looking less wetted surface to which it is busaca one less draft. KEY FEATURES LENGTH 18 m SLEEVE 6.5 m STRUT 1.6 m CALADO 0.48 m Cb 0.6 CRUISING SPEED 8.1 knots SPEED MAX. 20 knots In order to define the design of the research vessel necessary first scientific mission requirements as seen the future. Guidelines for the development of requirements were adapted from the Oceanographic Laboratory System National University (UNOLS) developed by the American Association Universities engaged in oceanographic research. The SMR for Coastal Research Vessel (CRV) has been developed on the basis of UNOLS system. The space laboratory and deck space Staff of Science. FISHING GEAR Fishing gear represents the set of materials and implements used for activities aimed at the extraction of fishery resources. ARTES DE PESCA PASIVOS ACTIVOS REDES SEDALES Y ANZULOS NASAS Y TRAMPAS LANZASY ARPONES REDES DE TIRO CHICHORROS O REDES DE PLAYA REDES DE CERCO ARRASTRE Y DRAGAS Trasmallos Redes Amalleras Líneas de mano y curricanes Palangre NETWORK DESIGN The development of a fishing net is a complex work, it involves testing both in laboratories and in the sea. Considerations to take into account are diverse as the drive speed, type of substance or depth at which fishing, mesh sizes, material type, cable length angles door operation, etc. will be held FORMULATION OF ESTIMATING RESISTANCE TO PROGRESS The formulation of expressions to estimate the strength of a network can be obtained through experimental tests or by using CFD. In both cases it is necessary to specify conditions such as flow rate, material, shape of meshes, etc. The following figure shows some parameters that are necessary measure to estimate the strength of the network in an experimental trial. Basic measures of the boat. Speed. propulsion and power requirements Range and Resistance. Stability. The main concern of potential users of research vessels is that the platform is capable of supporting a wide variety of equipment and activities. The main theme repeated over and over again was that the need for a flexible to handle large and increasingly varied pieces of equipment and the maintainability of the sea improved, which would extend the useful work at sea boat.

4 Stricter mathematical models are more and more complex due to the flexibility of product interaction network with the fluid. Starting from simple models and comparing experimental tests to obtain results for different types of networks that meet certain similarity with our test models. Of course the simulation software Computer Aided Engineering (CAE) may also give acceptable estimates if we are within their simulation conditions. The following figures show CFD models simulated networks. Measurements should be made for conditions in which there are no changes in fluid velocity or these should be small as well as consider a constant drag. An example taken from the reference gives us an idea of what represented the resistance values vs the drive speed, see Figure The tests are performed in a circulating water tank, as shown in the following figure. It has been the ability to perform our calculations experimentally, based on statistics and simulation using software based on the above. Now we present a methodology for calculation of the fishing net to which we want to estimate its hydrodynamic resistance.

5 5. RESULTS EVALUATION OF THE FIRST MODEL TO PROGRESS RESISTENACIA: RESISTENACIA ASSESSMENT TO PROGRESS SECOND MODEL: Slender Body analytical method recommended by the Maxsurf software for that type of helmet, the following diagram was obtained was used to evaluate the drag of the multihull. Noting that the maximum speed of 20 knots a total resistance of 18.2 KN was obtained. Which means a EHP, also noting that the cruising speed of 8.1 knots. Noting that the maximum speed of 21 knots a total resistance of KN was obtained. Which means a EHP, also noting that the cruising speed of 8.2 knots. Defend and finally the catamaran design fisheries research and oceanographic As the material of the hull this aluminum to be within this resistance can be less advance corresponding because less weight have proposed that if steel. According to the requirements the second model would be more useful to have more deck area than before, thus proposing this design shape and their respective dimensions.

6 6. CONCLUSIONS It is concluded that the optimal way for scientific fishing boat is a catamaran, for the best use of the deck area and improving maneuvering stability. The optimum dimensions with a resulting lower drag was L = 15m In a fishing net with increasing speed drag drag increases. The exact calculation of the drag that provides fishing net is very complex to calculate 7. REFERENCES [1]. Christensen, BA (nd). Modeling of Hydrodynamics Nets and trawls. Gainesvile, Florida [2]. Dremiere, PY (1988). Fisherman's Guide. Barcelona: Ediciones Omega, SA [3]. E., RS (2014). Arts, methods and fishing implements. San Jose, Costa Rica: MarViva Foundation. [4]. (2012, July 30). Retrieved October 11, 2016, from riers-to-achieving-lowimpact-fuelefficientfishing/ [6]. Knake, BO (1956). Assembly Methods for Otter - Trawl Nets. Washington DC. [7]. Kokane, MR (2008). MID-WATER TRAWL SURVEY VESSEL DESIGN FOR THE MFV. 120 Reykjavik, Iceland. [8]. Meyler, L. (2008). Simulation of Hydrodynamic Fields Net Structures. Giuseppe Giuliano Petrone and Cammarata. [9]. Pereira, JF (2012). Dynamic modeling of trawl fishing gear. Ship Science & Technology - Vol. 6. [10]. Reid, AJ (1977). A Formula for Pelagic Drag Net Nets. Scottish Fisheries Research. [eleven]. Reite, K.-J. (2006). Modeling and Control of trawl systems. Department of Marine Technology, Trondheim.

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