Academic literature on the topic 'Towing Tank Test'
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Journal articles on the topic "Towing Tank Test"
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Mori, Takayuki. "Hydrodynamic Test Facilities in Naval Systems Research Center- Large Towing Tank, High Speed Towing Tank and Flow Noise Simulator." Marine Engineering 56, no. 6 (November 1, 2021): 867–71. http://dx.doi.org/10.5988/jime.56.867.
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Tsai, Jing-Fa, and Chi-Chuan Chen. "Boundary Layer Mixture Model for a Microbubble Drag Reduction Technique." ISRN Mechanical Engineering 2011 (July 14, 2011): 1–9. http://dx.doi.org/10.5402/2011/405701.
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The boundary mixture model is derived to predict the performance of the microbubble drag reduction technique for a flat plate. The flat plate with a porous material microbubble injecting system and resistance-measuring system are set up to measure the frictional resistance of the flat plate without and with injected microbubbles. The tests are conducted in a water tunnel and a towing tank. The test results show that the boundary mixture model predicts the drag reduction well for the flat plate when testing with injected microbubbles in the water tunnel. However, the boundary mixture model overestimates the drag reduction effect for the flat plate tested in the towing tank. The possible mechanism for the overestimation of drag reduction effect in the towing tank may be due to the different behaviors of microbubbles in the velocity gradient of boundary layer.
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Syamsuar, Sayuti. "Gaya Hambat Saat Hidro Planing dan Gaya Angkat Aerodinamika Saat Cruise di Efek Permukaan pada Pesawat Wing in Surface Effect." WARTA ARDHIA 42, no. 2 (September 22, 2017): 71. http://dx.doi.org/10.25104/wa.v42i2.237.71-78.
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Perhitungan komputasional dinamika fluida pada model 3 Dimensi pada pesawat Wung In Surface Effect sangat penting untuk mengetahui data hasil uji towing tank dan uji terbang. Konfigurasi Lippisch mempunyai sayap berbentuk inverse delta dan punuk di atasnya menggunakan airfoil jenis Clark Y yang telah dirancang untuk memenuhi karakteristik efek permukaan. Piranti lunak pertama Maxsurf digunakan untuk membandingkan hasil uji model towing tank saat fase hydro planing. Piranti lunak kedua ANSYS CFX digunakan untuk menghitung gaya hambat air dan gaya angkat aerodinamika dari pesawat Wing In Surface Effect kapasitas 8 orang model 3 Dimensi dengan konfigurasi Berat Maksimum saat take off sebesar 32000 Newton pada kecepatan cruise 80 knots pada ketinggian terbang 2.5 meter. Aspek eksperimen pada uji model towing tank dan data uji terbang pada prototipe pesawat Wing In Surface Effect kapasitas (1-2) orang saat hydro planing dijelaskan dengan menggunakan teori gelombang hidrodinamika dan porpoising efek.
[The Hump Drags During Hydro planing and Aerodynamic Lift During Cruise in Surface Effect Altitude Of Wing in Surface Effect Craft] The computational fluid dynamics of 3 Dimensions model of Wing in Surface Effect craft is very important to proof the model towing test and flight testing data. The inverse delta wing and shoulder airfoil is by using Clark Y of Lippisch configurations have been designed for the surface effect characteristics. The first Maxsurf software are used to compared the towing test results during hydro planing phase. The second ANSYS CFX software is used to calculate the hump drags and aerodynamic lift of Wing In Surface Effect craft 8 seaters 3 Dimensions model to verified the Design Requirement and Objectives. The forces equilibrium on the body axis during hydro planing are very important to fulfill the take off phase on the water surface. And, the aerodynamic lift for Maximum Take off Weight of 8 seaters configuration is 32000 Newton during cruise speed at 80 knots on the 2.5 meter altitude. The experimental aspects of towing tank test model and Wing In Surface Effect craft (1-2) seaters prototype during hydro planing test have been proposed by using the hydrodynamic wave and porpoising effect theory.
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Longo, Joe, and Fred Stern. "Uncertainty Assessment for Towing Tank Tests With Example for Surface Combatant DTMB Model 5415." Journal of Ship Research 49, no. 01 (March 1, 2005): 55–68. http://dx.doi.org/10.5957/jsr.2005.49.1.55.
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Uncertainty assessment methodology, procedures, and results are presented for most typical towing tank tests using a 3.048 m geosym of naval combatant DTMB model 5415, which is an established benchmark for computational fluid dynamics validation. The tests include resistance, sinkage and trim, wave profile, wave elevations, and nominal wake. The procedures are summarized and follow International Towing Tank Conference Quality Manual Procedures. The facility and measurement systems are briefly described, and detailed uncertainty assessment examples for each test are provided with descriptions of bias and precision limits and total uncertainties.
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Hiltabrand, Robert R., and Gail S. Roderick. "Fire-Resistant Booms: From Testing to Operations1." International Oil Spill Conference Proceedings 1999, no. 1 (March 1, 1999): 535–39. http://dx.doi.org/10.7901/2169-3358-1999-1-535.
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ABSTRACT A great deal of concern and effort has gone into testing various fire resistant booms since the 1993 Newfoundland Offshore Burn Experiment (NOBE), when it became apparent that there were potential limitations in the performance of commercially manufactured fire booms. One of the major questions that arose after this experiment was the capability of fire booms to adequately support real in situ burn operations. Towing experiments on selected booms both at sea and in test tanks, coupled with data from burn tests based on proposed ASTM-F20 Standards, have begun to new reveal facts about the performance of these booms. Results of the at-sea towing tests indicate that, in general, booms with higher buoyancy-to-weight ratios attained higher critical tow speeds, sustained higher towing tensions, and maintained better wave conformance. Results of towing tests of booms containing oil at the OHMSETT test tank facility suggest that fire booms should perform successfully when tow speeds of less than 1.0 knot is maintained. Burn tests at the U.S. Coast Guard Fire and Test Detachment revealed that fire booms could be expected to maintain some structural stability and freeboard for at least three 1-hour burns during a deployment.
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Li, Guang Nian, and Xin Guo. "Design on the Testing System of the Towing Tank." Advanced Materials Research 217-218 (March 2011): 1026–31. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.1026.
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Considering the requirement of testing on ship powering performance, and the actual situation of the towing tank, a system, which contains the testing module of resistance performance, propeller on open water, self-propulsion and calibration, was designed. And a system software used for measuring ,controlling and analyzing date was written as well. Every modules’ main functions, test requirements and the realization forms were also put forward in this paper. Considering it not only meets the need of the model test mentioned already, but also fits the function expanding in the future, this system was designed to be modularized and scalable. I hope that it could give technical support to the researchers in ship performance and ship construction enterprises.
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Kang, Jung-Min, Yeong-Ho Lee, and Kyu-Chan Lee. "A Comparative Performance Test for Turbine in Wind Tunnel and Towing Tank." Journal of The korean society for new and renewable energy 7, no. 4 (December 25, 2011): 42–49. http://dx.doi.org/10.7849/ksnre.2011.7.4.042.
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Chen, Jeng-Horng, and Che-Chun Chang. "A moving PIV system for ship model test in a towing tank." Ocean Engineering 33, no. 14-15 (October 2006): 2025–46. http://dx.doi.org/10.1016/j.oceaneng.2005.09.011.
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Sverchkov, А. V., and M. V. Galushina. "Transom interceptor for towing resistance reduction of fast displacement ships." Transactions of the Krylov State Research Centre 4, no. 402 (October 14, 2022): 75–84. http://dx.doi.org/10.24937/2542-2324-2022-4-402-85-100.
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Object and purpose of research. This paper discusses three models of fast monohull displacement ships of various purpose and one model of fast passenger catamaran. The purpose of the study was to experimentally verify the efficiency of transom interceptor in towing resistance reduction. Subject matter and methods. The study was based on the test results available with Krylov State Research Centre Deepwater Towing Tank. Main results. This study was performed on four models and showed how their towing resistance depended on interceptor advance and static trim angle. Conclusion. The tests have confirmed the efficiency of transom interceptor in towing resistance reduction of fast displacement monohulls and catamarans with operational speeds corresponding to Froude numbers 0,4–0,6. Transom interceptor reduces towing resistance by 4,5–6,5 %.
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Ying, Zong Quan, Lin Wang Su, and Mei Hong Lin. "A Scale Model Test on Hydraulic Resistance of Tunnel Elements during Floating Transportation." Advanced Materials Research 919-921 (April 2014): 841–45. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.841.
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The transportation of tunnel elements is one of the most important procedures of immersed tunnel construction. To investigate the hydraulic resistance of tunnel elements during transportation, hydrodynamic scale model tests of the were carried out in a towing tank for the tunnel element transportation under wave action. The test results show that the hydraulic resistance is linear to the square of towing speed basically. The drag coefficients of the element under different water depths and dragging angles are calculated. The dragging coefficient decreases with the increase of water depth, and increases with the increase of the dragging angle. Finally, the influence of the wave is also discussed for the tunnel dragged in the open sea.
Dissertations / Theses on the topic "Towing Tank Test"
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Cook, Shane Stuart. "Effects of headwinds on towing tank resistance and PMM tests for ONR Tumblehome." Thesis, University of Iowa, 2011. https://ir.uiowa.edu/etd/2688.
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Calm water towing tank experiments consisting of resistance tests and static and dynamic planar motion mechanism (PMM) tests are performed for a surface combatant with primary focus on the effects of hurricane scale headwinds. The experiments are designed to gain a better understanding of the physics of ship response to wind and to provide a validation dataset for an unsteady Reynolds-averaged Navier Stokes (RANS)-based computational fluid dynamics (CFD) code used for computing both air and water flow around a ship. Hurricane scale wind speeds are chosen to maximize the measurable effect of wind on ship forces and motions for a more definitive analysis and comparison with CFD. The geometry is the 1/48.9 scale fully appended ONR Tumblehome model 5613, which has length L = 3.147 m and is equipped with a superstructure. Tests are performed in a 3.048 × 3.048 × 100 m towing tank with wind generated by a custom built wind carriage towed ahead of the ship model. Air-stream velocity measurements indicate a maximum relative wind speed magnitude of 9.38 m/s with 6 - 7% uniformity and RMS values of approximately 4.5%. The effects of three wind speeds on static and dynamic forces, moment, and motions are analyzed. Results show that wind contributes significantly to surge force (approximately 46% at Fr = 0.2). Resistance data shows agreement with CFD computations with errors averaging approximately 4%. The drag coefficient above water is approximately 0.3 and generally decreases with increasing ship speed. Sway force and yaw moment are largely affected when the ship experiences oblique orientation to the flow. Forces and moment exhibit quadratic scaling with wind speed. Roll is the most sensitive motion to wind and is counteracted by it up to 1.8° for PMM test conditions. In addition, harmonic amplitudes of forces and moment data from dynamic tests are used to determine hydrodynamic derivatives for all three wind conditions following a mathematical model. The effect of wind on hydrodynamic derivatives is significant with changes on the order of 10 - 100%.
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Masetti, Felipe Ribolla. "Caracterização da manobrabilidade de embarcações em áreas restritas, baixa velocidade e operação em regime transitório." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-05112018-153655/.
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Esta dissertação de mestrado tem como objetivo a validação do modelo numérico de manobras para navios utilizado pelo simulador chamado SMH - Simulador Marítimo Hidroviário, que foi desenvolvido no laboratório Tanque de Provas Numérico. Para tanto foram realizados ensaios experimentais de manobras com um modelo em escala reduzida da embarcação Alpha Crucis com o objetivo de criar dados de manobra que serviram como referência para validação do modelo numérico. Foram selecionados diversos tipos de manobras com o propósito de criar uma caracterização da manobrabilidade da embarcação em baixas velocidades e regime transitório, permitindo a medição de diversas características, que permitem quantificar as capacidades de manobra da embarcação. Através de experimentos numéricos foram, então, realizadas as mesmas manobras executadas pelo modelo físico em escala reduzida, de forma a reproduzir as mesmas condições iniciais e os mesmos comandos, procurando reproduzir as manobras para validação do modelo implementado no SMH. Os resultados obtidos apresentam a aderência das características de manobras do modelo implementado no SMH, através da comparação das características de manobra obtidas pelo modelo físico em escala reduzida e das obtidas pelo modelo numérico. A dissertação apresenta ainda um estudo de sensibilidade que mostra o efeito dos principais fatores utilizados no laboratório Tanque de Provas Numérico para a calibração dos modelos de embarcações, mostrando que para as manobras consideradas neste trabalho alguns dos efeitos possuem pouca influência nos resultados. Por fim o trabalho conclui que o modelo matemático utilizado pelo SMH representa a capacidade de manobra da embarcação de forma consistente para diversos tipos de manobra, e com um grau de aderência satisfatório.This research aims to present a validation for the ship maneuvering simulator named SMH, anachronym in Portuguese for Maritime and Waterway Simulator, developed on Tanque de Provas Numérico laboratory. For this propose small scale tests were performed with a model of Alpha Crucis ship aiming to create maneuver data that was used as reference for the numerical model validation. Several types of maneuver where selected to create a characterization of the maneuverability of the ship at low speeds and transient regime, and the parameters that quantify the maneuverability were measured. Then were performed numerical experiments recreating the same maneuver executed with the experimental model, with the same initial conditions and propulsion/rudder controls, trying to reproduce the maneuvers to validate the model implemented on the SMH. The results showed that the maneuvering characteristics predicted by the SMH simulator are similar to measured values in the experiment. The dissertation also presents a sensitivity study that shows the effect of the main parameters used in the laboratory Tanque de Provas Numérico for the vessel model calibration, This study showed that for some maneuvers, the tuning parameters have less influence on the results. Finally, the work concludes that the mathematical model used by the SMH represents the ability of the vessel to maneuver consistently for several types of maneuvers, and with a satisfactory degree of accuracy.
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Pereira, Felipe Rateiro. "Confrontação numérico-experimental da dinâmica de sistema flutuante, considerando seu acoplamento com linhas de produção." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-17082010-114913/.
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Esta dissertação de mestrado tem como objetivo fundamental a apresentação de análises e comparações, que visam fazer parte do processo de aprimoramento constante do método numérico de simulação de unidades flutuantes produtoras de petróleo, chamado TPN Tanque de Provas Numérico. Para tanto, foram executados ensaios com modelo em escala reduzida, cujos resultados foram comparados com o modelo numérico do TPN. A unidade padrão utilizada nos ensaios foi a plataforma semi-submersível ITTC-SR192, escala 1:105, ensaios estes realizados no tanque de provas do IPT Instituto de Pesquisas Tecnológicas do Estado de São Paulo. Por meio de comparação com os resultados dos ensaios, foram verificadas as habilidades do TPN em reproduzir os movimentos do casco, a tração no topo das linhas de produção e o amortecimento induzido pelas mesmas. Importante destacar que os parâmetros verificados tiveram a finalidade adicional de confrontar os resultados numérico-experimentais com foco na investigação da influência das linhas de produção na própria dinâmica do sistema flutuante. Tendo em vista esse objetivo complementar, todos os ensaios foram realizados com e sem a presença de linhas de produção, no texto referenciadas apenas por risers, modeladas como um grupo de estruturas bastante flexíveis e de grande diâmetro, a fim de prover um aumento significativo no amortecimento do sistema. Sendo assim, o comportamento dinâmico dos casos com e sem risers foram comparados buscando observar as diferenças nos movimentos do sistema em ondas e correnteza. Além disso, utilizando o método recomendado pela API, referência [3] , doravante denominado apenas por método Near and Far, a tração de topo de um dos risers foi simulada numericamente com a imposição de movimentos obtidos nos experimentos, dando assim meios para comparação dos critérios de projeto, considerando a influência das linhas conectadas nas plataformas de petróleo.This research aims to present analysis and comparisons, intended to make part of the constant improvement of the oil platform analysis software, called Numerical Offshore Tank (Tanque de Provas Numérico - TPN). For this purpose, small-scale model tests were performed, and the results compared with the numerical model in TPN. The standard unit used in these model tests was the semisubmersible ITTC-SR192, at scale 1:105, and the tests were performed at IPT (State of São Paulo Institute for Technological Research) towing tank. By means of the model tests results comparisons, the ability of the TPN in reproduce the hull motions, the risers top tensions and damping induced by these lines was evaluated. Importantly, these parameters were verified with the further purpose of comparing the numerical and the experimental results, focusing on the influence of the production lines in the dynamics of the floating system. Taking into account this additional objective, all the model tests were performed with and without production lines, i.e. risers, modeled as a group of highly flexible and large diameter structures, in order to provide a significant increment in the damping of the system. Thus, the dynamic behaviors of the cases with and without risers were compared, giving means to observe motion differences in waves and current. Moreover, using the method recommend by API, reference [3], hereinafter called Near and Far, the top tension of one riser was numerically simulated with the imposition of the motions obtained in the experiments, giving means to compare the riser design criteria, considering the influence of lines attached to the oil platforms.
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Scholtz, Selwyn. "Talk and text in the organisation of production : perspectives of a "new capitalist" workplace in Cape Town." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/7900.
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This thesis is a study of the literacy practices that characterise the communicative and productive processes at an automotive product manufacturing plant in Cape Town, South Africa. This shock absorber factory is consciously structured as a ""new workplace"" where the focus in productio is on ""flexible specializatio"" that allows quick shifts to be made between product lines where the focus in the social relations of work is on devolution of responsibility to individual employees and sells as organizational units of labour, interchangeable tasks and enlarged scope for workers to participate in decision making.
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Pereira, Felipe Rateiro. "Investigação das vibrações induzidas pela emissão de vórtices em modelos reduzidos de riser lançados em catenária." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-04022016-183409/.
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O estudo do fenômeno de vibrações induzidas pela emissão de vórtices, ou VIV, em risers é um tópico de grande relevância para a engenharia oceânica. Nos últimos anos, diversos resultados vêm sendo apresentados, numéricos e/ou experimentais, buscando o entendimento dos fundamentos deste fenômeno de interação fluido-estrutural, no entanto, sem um entendimento conclusivo e abrangente. Neste contexto, risers também estão sujeitos à ação de correntezas oceânicas e, consequentemente, ao fenômeno de VIV. Neste sentido, o presente estudo traz resultados de uma abordagem experimental para o entendimento do fenômeno de VIV em risers lançados em catenária, configuração que representa grande parte das geometrias adotadas em lançamentos atuais. No entanto, a realização de experimentos com risers em tanque de provas pressupõe a utilização de modelos reduzidos, o que, por si só, representa um grande desafio de pesquisa. Para tanto, desenvolveu-se uma metodologia para a modelagem de risers em escala reduzida, com foco na similaridade entre parâmetros importantes que garantam um comportamento dinâmico equivalente àquele em escala real. Foram, então, realizados experimentos de VIV com catenárias concebidas e construídas com base nesta metodologia, posteriormente ensaiadas em tanque de reboque. Para análise dos resultados, foram utilizadas técnicas como a decomposição modal, que possibilitou a comparação desses com alguns resultados da literatura, mostrando que o fenômeno de VIV na catenária se processa de maneira bastante semelhante ao identificado nos cilindros flexíveis. Além disso, a extensa base de dados experimentais apresentada e discutida nesta tese contribui para futura validação de diversos modelos matemáticos e códigos numéricos de predição do VIV em catenárias, descrevendo com detalhes inúmeros comportamentos imersos neste problema importante de engenharia.The study of Vortex-induced vibrations in risers is a topic of great relevance in the context of ocean engineering. In recent years, several numerical and experimental results have been presented, addressing the understanding of the fundamentals of this fluid-structure interaction phenomenon, however without a conclusive and comprehensive understanding. In this context, risers are exposed to the action of ocean currents and consequently to the phenomenon of VIV. In this sense, the present study provides results of an experimental approach to understanding the VIV phenomenon on risers launched in catenary configuration, which represents much of the geometries adopted today. However, performing risers experiments in towing-tanks presupposes the use of small-scale models, which represents a major research challenge. Therefore, a methodology for modeling reduced scale risers was developed. The focus of this methodology was on the similarity between certain important parameters that guarantee an equivalent full-scale dynamic behavior. VIV experiments were then performed in the towing tank, with the designed and constructed catenary, based on this methodology. Techniques such as modal decomposition were used for the analysis of the results. This allows the comparison of the results with classical literature paradigms showing that VIV response in the catenary is close to results obtained with flexible cylinders. Furthermore, the large experimental database presented and discussed in the study may contribute to future validation of several mathematical models and numerical codes of VIV prediction in catenary risers, describing in detail several immersed behaviors in this important engineering problem.
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Chang, Che-Chun, and 張哲群. "The Development of a Moving PIV System for Ship Model Test in a Towing Tank." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/62816078816479956299.
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碩士國立成功大學
系統及船舶機電工程學系碩博士班
93
In the last decade, Particle Image Velocimetry (PIV) as another non-intrusive optical measurement technique has become a mature flow velocity measuring method. In this study, PIV which is different from multiple Pitot tubes applied generally in ships’ flow field survey was built successfully in a towing tank to observe velocity fields near a ship model. The experimental method and arrangements of all adjustable devices and instruments on the carriage were discussed in this article. A particle- seeding device was fixed in front of the carriage to seed particles uniformly in test area in advance. After tries and errors, a special techniques and a standard procedure for conducting experiments were established. Then, the flow fields of two kinds of ship models, yacht and HSVA, in the streamwise and cross-streamwise directions were used to compare the difference between them. At last, all related problems due to ship type and towing speed influencing the quality of captured images and results were discussed. A ship model with V-shape bottom and protruding keel might cause some disadvantages for PIV measurements. The use of longer laser light ducts extending deeper is a possible solution. A ship model with light yellow paint will cause the unproportionate of light and will cause white background on captured images. It is suggested to re-paint the ship model in black or dark colors to solve this problem. In high-speed test conditions, a ship model’s bow waves entrain large amount of air bubbles into water and those bubbles will block the view of camera causing some random black spots in the images. Thus, it is necessary to remove the useless black spot data and repeat the same test condition if statistics requires enough number of images.
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Jian-TingChen and 陳建廷. "The Confirmation and Analysis for the Operation Skill of Open Water Test of Propeller Performance in NCKU Towing Tank." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/05377136491456295809.
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碩士國立成功大學
系統及船舶機電工程學系
104
The mainly purpose of this research is to confirm the operation skill of open water test of propeller performance in NCKU towing tank and analyze the accuracy of result compared with foreign commercial tank. The final purpose is to establish the ability of power prediction of ships and improve the reliability in NCKU towing tank. The original equipment of open water test in NCKU towing tank was used for education and it can conduct the test for only 10 cm of diameter of propeller model so the experimental skills of operating open water test for 25 cm of diameter of propeller model will be set up in this research. The object of upgrading the equipment is that it is necessary to perform the propeller open water test using the same one model propeller with self-propulsion test because of the scale effect. Two model propellers which are called R0 and J3 respectively have been tested and measuring the value of KT and KQ and do the uncertainty analysis. According to the results in this research ,there is smaller uncertainty ,the max value of KT and KQ is 3% and 2% respectively, when performing open water test with model R0 and the Reynolds number reaches 4.5×10^5. The max value of uncertainty of KT of model J3 is 2% and KQ of model J3 is 0.6% when the advance ratio is less than 0.85 and the Reynolds number reaches 4×10^5. So the Reynolds number must reach 4×10^5 when conducting the open water test in NCKU towing tank under the rate load of equipment depending on the result in this research.
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Tran, MQ. "Performance analysis and simulation of an autonomous underwater vehicle equipped with the collective and cyclic pitch propeller." Thesis, 2018. https://eprints.utas.edu.au/30796/1/Tran_whole_thesis.pdf.
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There is a growing need within marine sciences and engineering that requires the torpedo shaped Autonomous Underwater Vehicles (AUVs) being capable of accomplishing various complex surveillance missions, including scientific, commercial and military applications. Be-sides the traditional research on the control and navigation of an AUV, the propulsion system study becomes more and more essential to increase the manoeuvrability and efficiency of AUV.
The conventional propulsion system with fixed pitch propeller (FPP) and control surfaces at the aft end is the predominant propulsion type used by AUVs. This propulsion configuration has the shortcoming of insufficient low-speed manoeuvrability since the control surface manoeuvring forces are only generated when the vehicle is in motion. This is one of the fundamental limiting factors for the current torpedo shaped AUVs. The development of new propulsion system enabling both low speed and cruising speed operations could expand the typ-ical operational envelope of an underwater vehicle and pave the way for the new applications.
This thesis focuses on the characteristic analysis of an innovative propulsion system called the Collective and Cyclic Pitch Propeller (CCPP) and the manoeuvring performance of an AUV equipped with CCPP. In the CCPP mechanism, the angles of each propeller blade can be positioned periodically during a rotation in both collective and cyclic pitch setting. CCPP has the capability to provide continuous propulsive force and manoeuvring forces simultaneously.
The primary task of the thesis was to explore the feasibility of a prototype CCPP to an under-water vehicle by numerically conducting the comparison between the AUV equipped with CCPP and FPP in standard manoeuvring tests. Initially, the Experimental Fluid Mechanics approach was utilised to investigate the performance and derive the mathematical models of the CCPP and FPP. Two separate experimental apparatus were designed and implemented in this research for CCPP and FPP system. In the first experiment, the dynamic modelling of FPP using the four-quadrant model was proposed based on experimental data. The second exper-imental study involved the extensive investigation of the CCPP to establish its hydrodynamic characteristics. A series of comprehensive bollard pull and captive model tests were designed and conducted to evaluate the propulsion performance. Furthermore, the research developed a numerical simulation program called AUVSIPRO to examine the performance and manoeuvring characteristics of an AUV equipped with the CCPP as well as conventional configuration FPP. The Gavia AUV was used as the research platform and its mathematical model with non-linear hydrodynamic coefficients were defined using the theoretical approach. Standard manoeuvring tests of marine vehicles were fully presented in the simulation program to analyse the manoeuvrability. In addition, the results from the experiments and simulation were utilised in the comparison study between the CCPP and conventional configuration applied to AUV. Finally, the controller design for an AUV equipped with a CCPP was conducted. The two-stage system identification method was proposed to develop the linear system model, which was applicable for the control design. The optimal state feedback algorithm was presented as the control strategy.
The propulsion systems for AUV have been subject to an increased focus with respect performance and manoeuvrability. This research is an exploration into the feasibility and viability of CCPP propulsion system for a torpedo shaped AUV and contributes to the areas related to the development of propulsion system for an underwater vehicle.
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Wei-YangChen and 陳維揚. "The Improvement and Comparison of the Main Ship Model Tests in a Towing Tank." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/22444198661256141918.
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碩士國立成功大學
系統及船舶機電工程學系
102
This study analyzed the results of the current NCKU ship model test and compared to the results of foreign commercial tank from economical and accuracy aspects. This study improved the accuracy of resistance test and wake survey experiments in NCKU water tank. Two methods were also established for the self-propulsion test. This study aimed to investigate that the differences between different methods. It improved the reliability of NCKU towing tank and competence of Taiwan ship building industries. Our research in resistance test use a steel wire to tow the model ship, then we try to compare it to the results from bar-towed method. Besides, the height of wire rope is equal to the propeller shaft to avoid producing a moment. The conclusion is that wire-rope method it is better than bar-towed method because It is more accurate and easy to use. Self propulsion test use dynamometers to measure the revolution, torque and thrust. The arrangement details depends on which method used. We try to compare the accuracy in constant speed method and constant loading method. The conclusion is that the constant load method is time-saving, but we must take constant speed method in account first in terms of accuracy. The five-hole pitot tube measurement system is located behind the stern of a container ship model and used to measure the three-dimensional velocity profile of inflow on propeller plane, namely radial velocity, axial velocity and tangential velocity. This research is aimed to improve the accuracy in wake survey measurement system.
Book chapters on the topic "Towing Tank Test"
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Gao, Lei. "Towing Tank Test." In Encyclopedia of Ocean Engineering, 1–9. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-10-6963-5_264-1.
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Salas, M., C. Cifuentes, G. Tampier, and C. Troncoso. "Nontraditional Towing Tank Tests." In Proceedings of the 25th Pan-American Conference of Naval Engineering—COPINAVAL, 139–47. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89812-4_13.
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De Luca, F., and C. Pensa. "The prediction of the interceptor performances based on towing tank test data." In Developments in Maritime Transportation and Exploitation of Sea Resources, 231–38. CRC Press, 2013. http://dx.doi.org/10.1201/b15813-31.
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Alkan, Ahmet Dursun, Onur Usta, Alpay Acar, and Elis Atasayan. "Investigation of Environmental Effects of High Speed Boats." In Progress in Marine Science and Technology. IOS Press, 2020. http://dx.doi.org/10.3233/pmst200021.
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Luxury high-speed boats are increasingly being used for entertainment purposes. However, not only humans, but also animals are negatively affected by high-speed boats, and time is running out fast for people to do something about it. This study presents a review of current negative effects of high-speed boats to the environment. In this study, the flow around a benchmark planing Fridsma boat is simulated by CFD and resistance values for different non-dimensional Froude number (Fn) conditions are validated from the experimental results obtained from the literature. Using the same CFD methodology, a catamaran model in which the towing tank test results are available, is simulated for different Fn conditions and resistance values are predicted. In the CFD analysis, unsteady flow around the Fridsma hull model and catamaran model is simulated using overset meshing technique and turbulence is modeled by Reynolds Averaged Navier Stokes (RANS) with SST (Menter) k-omega turbulence model. Resistance values are compared with the experimental data and required propulsion powers are estimated for different Fn conditions. Then, total resistance of the catamaran for full-scale vessel is calculated using an extrapolation method and required propulsion power predictions are conducted. Noise prediction, corresponding to the required propulsion power are presented. In particular, the change of noise level and harmful gases released into the environment, when the speed of the vessel increases are examined and discussed. Consequently, it is believed that this study would lay an important foundation for the widespread investigation for the negative effects of the high-speed boats in the future.
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Costanzo, Marcello, Andrea Mancini, and Luca Mauro. "A Systematic Ferry Series." In Progress in Marine Science and Technology. IOS Press, 2022. http://dx.doi.org/10.3233/pmst220009.
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A number of seventeen models of Ferry in scale 1: 28.750 of 10250 ton displacement have been built at the Italian Model Basin, to be tested in the Emilio Castagneto towing tank at INM in Rome. The results of the tests have been collected in this report, delivered and presented in easy and useful form.
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"Seakeeping and manoeuvring An automatic track control for an autonomous model for towing tank tests." In Towards Green Marine Technology and Transport, 113–18. CRC Press, 2015. http://dx.doi.org/10.1201/b18855-16.
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Odetti, Angelo, Marco Altosole, Marco Bibuli, Gabriele Bruzzone, Massimo Caccia, and Michele Viviani. "Advance Speed-Hull-Pump-Jet Interactions in Small ASV." In Progress in Marine Science and Technology. IOS Press, 2020. http://dx.doi.org/10.3233/pmst200043.
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This paper is related to the technological development of an innovative small-size Autonomous Surface Vehicle designed to meet the requirement of accessing, monitoring and protecting the shallow waters peculiar of the Wetlands. The first prototype of a fully electric, modular, portable, lightweight, and highly-controllable Autonomous Surface Vehicle (ASV) for extremely shallow water and remote areas, namely SWAMP, was developed by CNR-INM and DITEN-Unige. This catamaran is equipped with four azimuth Pump-Jet Modular (PJM) actuators designed for small-size (1 to 1.5 m long) ASV. The main advantage of Pump-Jet thrusters is that they are flush with the hull, thus minimizing the risks of damages due to possible grounding. This system is used to increase the manoeuvrability in narrow spaces and to increase the spacial resolution by allowing the access also in extremely shallow waters with smaller risk of loosing manoeuvrability. The knowledge of the hydrodynamic characteristics of the thruster and of the vessel allows to partly or fully identifying the vessel for a better controllability. With this aim a series of tests have been conducted in the DITEN towing tank. In particular advance resistance on the SWAMP hull in deep and shallow water, bollard pull and self-propelling tests with the Pump-Jet Module working have been carried out. The results of the tests with the effects of advance speed on the PJM performance is reported in this paper together with the description of the modelling of the thruster itself.
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Cook, David. "Interview With Official Spokesman Abu Mus‘Ab Al-Barnawi." In The Boko Haram Reader, edited by Abdulbasit Kassim and Michael Nwankpa, 369–72. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190908300.003.0056.
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(27 JANUARY 2015) [Trans.: Abdulbasit Kassim] Available at: http://jihadology.net/2015/01/27/al-urwah-al-wuthqa-foundation-presents-a-new-video-message-from-from-boko-%e1%b8%a5arams-jamaat-ahl-al-sunnah-li-dawah-wa-l-jihad-interview-with-the-official-spokesma/ From 3–7 January 2015, Boko Haram attacked Baga, a town on the border with Chad, and gained control over the military base of the multinational Joint Task Force. According to Amnesty International, the attack on Baga, which claimed as many as 2,000 lives, was the deadliest attack in the history of Boko Haram. Although the Nigerian military underestimated the number of casualties, Abu Mus‘ab al-Barnawi, son of Muhammad Yusuf, in this interview explained the reasons Boko Haram attacked Baga and the strategic importance of the city to the group and the Nigerian military. This video and the next video (text 54) are unique for the fact that they were issued under a new media agency, al-‘Urwa al-Wuthqā, and did not mention Shekau at all, while the style and contents of the videos carry many of the messages of Ansaru, protesting Muslim civilian deaths. It is likely that the speaker in this video represented a faction of Boko Haram that comprised of former Ansaru members who reintegrated with Boko Haram ...
Conference papers on the topic "Towing Tank Test"
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Irvine, Martin, and Thomas C. Fu. "Test Design for Towing Tank Tests of Large Models." In SNAME 29th American Towing Tank Conference. SNAME, 2010. http://dx.doi.org/10.5957/attc-2010-021.
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Current research areas in naval design and hydrodynamics are pushing the size of experimental models to larger scales to reduce scale effects and due to the increased size of the concepts. These larger models require special test design considerations for testing in existing facilities. Indoor/outdoor use models can be carefully designed for testing in both environments and to ensure sufficient powering. Articulated models introduce additional degrees-of-freedom, that require installation configurations using pitch and heave mounts (grasshoppers) to compensate. Large models encounter higher forces that require either more robust tow posts and/or grasshoppers to alleviate the encountered hydrodynamic forces and follow wave impacts.
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Latorre, R., J. Y. Billard, F. Moutant, and O. Roussel. "Bubble Capture Tests with a Large Hydrofoil Towing Tank Test." In SNAME 26th American Towing Tank Conference. SNAME, 2001. http://dx.doi.org/10.5957/attc-2001-003.
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The interaction of gas bubbles with a vortex is investigated experimentally to clarify the role of the initial bubble position on its trajectory around the tip vortex shed from a large hydrofoil. The experiments performed with 4-6 mm bubbles show they can undergo no capture, quick capture into the tip vortex or slow capture with a spiral trajectory around the vortex. The results also reveal a scaling problem, analysis of the bubbles shows that while the bubbles in the large-scale foil tests, have a spherical -elliptical shape when they are scaled to cavitation tunnel they are spherical microbubbles.
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Hrubes, J. Dana, Charles W. Henoch, Ivan N. Kirschner, Clifford M. Curtis, and Pierre J. Corriveau. "NUWC Supercavitating High Speed Bodies Test Range: Description and Test Results." In SNAME 25th American Towing Tank Conference. SNAME, 1998. http://dx.doi.org/10.5957/attc-1998-020.
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As submarine operations increasingly move into coastal waters, the risk of submarine close encounters increases, as does the vulnerability of the platform to advanced threat weapons systems. A hard-kill terminal defense system would provide an effective response against these close-in threats. This system must detect. classify and localize a potential threat. aim an underwater gun, and launch a very high-speed projectile towards a target to neutralize it. To deliver enough kinetic energy to the target without enormous parasitic drag requires unconventional methods -- supercavitation technology.
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Brown, Neal A., and Alan Guarino. "The Ohmsett Ocean Energy Test Facility." In SNAME 29th American Towing Tank Conference. SNAME, 2010. http://dx.doi.org/10.5957/attc-2010-019.
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The U.S. Department of the Interior, Minerals Management Service (MMS) is now tasked to collaborate with research institutions and industry on testing ocean wave and current energy conversion systems. Accordingly, MMS recently expanded the mission of its Ohmsett Facility to include such testing and research, Ohmsett, The National Oil Spill Response Research & Renewable Energy Test Facility, has one of the largest outdoor saltwater tanks in North America and is designed to evaluate the performance of model- and full-scale equipment under realistic environmental conditions. The facility, operated by MAR Incorporated under contract to MMS, is located at the Naval Weapons Station Earle Waterfront facility in Leonardo, New Jersey (about one hour drive south of New York City). At the heart of Ohmsett is a very large outdoor, above-ground concrete test tank that is 203 meters long, 20 meters wide 3.5 meters deep and holds 10 million liters of crystal clear salt water. The Ohmsett tank is equipped with three movable bridges providing speeds of up to 6.5 knots, programmable in 1/100th knot increments, to simulate ocean currents or vehicle speeds. The robust tow bridges are able to accommodate the torques and forces of the largest current turbines and wave energy converter (WEC) equipment. The Control Tower is fully computerized and data from various sensors and video cameras are collected for analysis. The Ohmsett tank system allows testing of fullscale equipment. The tank's wave generator creates realistic sea environments, while state-of-the-art data collection and video systems record test results. The data collection system is capable of recording up to 32 channels. The facility has proven to be ideal for testing developmental equipment, subjecting research findings to validation, and evaluating acquisition options. The new generator system, located at the south end of the tank, can produce waves at discrete frequencies with heights up to one meter, as well as FM Slides, and JONSWAP or Pierson-Moskowitz spectra with controlling parameters of driving wind velocity and scale ratio. Recognizing physical limits on wave-maker stroke, probabilities of clipping on axes of these two parameter values are displayed with their touch-pad selections. The theoretical stroke-to-wave height transfer gain of the wave flap is being compared with a number of measurement observations. Customers may specify their own wave characteristics if they are not adequately represented by these standard types. A new beach system is being developed at the north end of the tank that will allow long runs of variable wave incidence with minimal interference from reflections. The facility includes a well-equipped machine shop and assembly area, and extensive lifting and transport capabilities. As well as its renewables mission, “Oil Patch” business is invited. Potential users will find a skilled technical staff, relaxed hands-on atmosphere and a very attractive financial environment.
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Delgado-Saldivar, Gabriel. "Test Results of a Planing Hull Series." In SNAME 24th American Towing Tank Conference. SNAME, 1995. http://dx.doi.org/10.5957/attc-1995-028.
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A systematic series of planing hull, representative of the modern hull shape has been tested at the Technical University of Nova Scotia (TUNS). The experiment included the upgrading of the tank, design of the geometric characteristics for the series, testing of the hulls and processing of data. The series consists of 9 models with a systematic variation of the L/B ratio with values 2.5, 3.0 and 3.5, and three deadrise angles P of 12°, 18° and 24°. The weight displacement A, Lex; and thrust line were also varied systematically, giving a total of 210 test conditions at 10 velocities each. This document describes the series design and testing and the results obtained. Initial findings are outlined as well as some recommendations for future research.
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Park, Joel T., Toby J. Ratcliffe, Lisa M. Minnick, and Lauren E. Russell. "Test Results and Uncertainty Estimates for CEHIPAR Model 2716." In SNAME 29th American Towing Tank Conference. SNAME, 2010. http://dx.doi.org/10.5957/attc-2010-025.
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The 24th International Towing Tank Conference (ITTC) has initiated an inter-laboratory test of a 5.720 m length model that is geometrically similar to David Taylor Model Basin (DTMB) model 5415, a pre-design version of the U. S. Navy surface ship combatant DDG-51. Resistance, sinkage, and trim measurements were completed during the last week of August 2009 on DTMB Carriage #1. Test results include an uncertainty analysis. Since the test program was initiated, the uncertainty analysis procedures were revised by the 25th ITTC for consistency with the ISO Guide to the Expression of Uncertainty in Measurement (ISO GUM 1995). This paper describes the analysis by the ISO GUM. All measurement results are traceable to NIST (National Institute of Standards and Technology). These results are for a test conducted on a single day over a Froude number, Fr, range of 0.10 to 0.41 and 9 different velocities. Only resistance results are reported here. A total of 12 repeat runs were performed at Fr = 0.10, 0.28, and 0.41. The variation in results is quite large in comparison to the uncertainty estimate at a single run condition. The uncertainty from Type A method as computed from the standard deviation of the time series was the largest uncertainty component in resistance from the drag block gages. For example at Fr = 0.41, the residuary resistance coefficient was CR = 0.003721 ±0.000041 (±1.11 %) with about ±0.000031 (±0.83 %) from the block gage measurement. A 4th-order polynomial approximates the experimental data quite well with a correlation of coefficient of 0.999. The fitted value at Fr = 0.41 is CR = 0.00366 ±0.00012 (±3.3 %). The curve fitted value is considered to be the best estimate of the uncertainty when combined with the measured value. For the most part, the resistance coefficients are in agreement with previous results within the uncertainty of the estimates.
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Mackay, M., G. Unsworth, G. Panton, and Y. Theriault. "Development Studies for a Six Degree-of-Freedom Marine Dynamic Test Facility." In SNAME 23rd American Towing Tank Conference. SNAME, 1992. http://dx.doi.org/10.5957/attc-1992-029.
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This paper outlines development studies for a large six degree-of-freedom dynamic test rig proposed for the IMD Clearwater Towing Tank. A full size pilot test rig, fully functional in the vertical plane, was built for this purpose. Tests were done on a static frame in air and water, using a 2 m long submarine hull model. A number of the principal test results are presented and discussed.
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Zseleczky, John, and Steven Cohen. "Model Test to Evaluate the Capsize Resistance of a Motor Lifeboat in Breaking Waves." In SNAME 22nd American Towing Tank Conference. SNAME, 1989. http://dx.doi.org/10.5957/attc-1989-051.
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In the concept stage of designing a new motor lifeboat, model tests were used to investigate the behavior of the proposed boat in large breaking waves. Instead of attempting to predict full scale performance of the boat in an absolute sense, comparative tests were performed using models of both the new boat and an existing boat - whose full scale performance was well documented after years of service in the field. This paper summarize a the model test techniques and test results obtained from the program.
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Kouvaras, Nicholas, Manhar Dhanak, and Nikolaos Xiros. "Test Platform Development for Measuring SES Response to Wave Loads." In SNAME 29th American Towing Tank Conference. SNAME, 2010. http://dx.doi.org/10.5957/attc-2010-005.
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The goal of this project is to develop a test platform for measuring SES response to wave loads. The platform is designed and built incorporating a self-propelled vehicle with data acquisition and navigation capabilities. Theoretical analysis is performed, various hardware and electronic parts are designed and built and software applications developed. Wave tank experiments are conducted for test platform evaluation and determination of vehicle response to a range of wave conditions. Furthermore, a 3D model of the AIRCAT scale model SES is created. The theoretical analysis shows that the scale effects in some cases are great, so resonance phenomena cannot be observed. The experimental results clearly show that the heave, pitch and aircushion excess pressure fluctuations increase as mean aircushion excess pressure increases. The bow skirt arrangement needs improvements and further experimentation is necessary in order to draw conclusions about the wave loads applied on the skirt.
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Etter, Robert J. "State of the Art - Cavitation Test Facilities and Experimental Methods." In SNAME 26th American Towing Tank Conference. SNAME, 2001. http://dx.doi.org/10.5957/attc-2001-016.
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Cavitation tunnels have played a critical role in the development of ships and other naval vehicles and the associated research applicable to the engineering of these vehicles. Particularly important has been the use of cavitation tunnels in the development of propulsion systems. The paper reviews some aspects of the historical development of the modern cavitation tunnel. It includes aspects of tunnel design such as size, speed, pressure range, acoustics, and materials. Model construction, installation, and instrumentation are discussed. Initially, the most innovative development occurred in 1895 with the invention of the cavitation tunnel by Sir Charles Parsons. More than 100 years later, the cavitation tunnel is still the key test facility used for cavitation research, test and evaluation. Technologies currently used for performance evaluation have changed greatly over those used only a decade or two ago. This has been in part due to incredible innovations in the area of instrumentation and digital electronics as well as the need to characterize modern propulsors in ways not previously required. The evolution of cavitation tunnel capabilities and the use of the tunnel in a large marine research, development, and design organization is largely reviewed by considering the various cavitation tunnels which have been constructed and utilized at the David Taylor Model Basin over several decades.