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Papers by Claudio Troncoso
Proceedings of the 25th Pan-American Conference of Naval Engineering—COPINAVAL, 2018
Traditionally, towing tanks had been used primarily to assess the resistance of hulls in calm wat... more Traditionally, towing tanks had been used primarily to assess the resistance of hulls in calm water, by means of towing geometrically similar scaled models at equal Froude number, usually without appendages such as rudder, propeller, and so on. When wave-making capability is available, towing tanks can also be used to determine seakeeping occurrences, such as green water effects and slamming, for a range of wave frequencies and amplitudes. This is not different for the University Austral of Chile Towing Tank, which has been involved in resistance and seakeeping tests of a variety of hulls, from fishing vessels to ferries, barges, and passenger ships, over the past 40 years. The development of marine industries other than shipbuilding, such as aquaculture, maritime connectivity of isolated geographical regions, and the harvesting of marine energy from tides and waves, have demanded a new set of tests with adequate models to properly replicate the physics of the full-scale case in the...
Ciencia y tecnología de buques, 2018
Traditionally, Naval and Oceanic Engineering has been focused on research in surface and submarin... more Traditionally, Naval and Oceanic Engineering has been focused on research in surface and submarine ships; and fixed and floating offshore structures. More than 90% of world trade is transported by sea, so it is not surprising that most research efforts have been focused on making merchant ships more efficient and safer. Something similar is happening in the offshore industry driven by the demand for energy. Despite the evident need to perform research in the traditional fields of Naval and Oceanic Engineering, new challenges have caused universities and research centers to tackle new fields of research. This paper presents some of the research and innovations developed at the Institute of Naval and Maritime Sciences (ICNM) of the Austral University of Chile (UACH). These new frontiers for research address problems as diverse as the capturing of energy from waves and currents [1], the development of structures and systems for aquaculture [2], the design of autonomous underwater vehic...
Ocean Engineering, 2017
Abstract The current work presents a novel way to evaluate the interaction effects in a diffuser-... more Abstract The current work presents a novel way to evaluate the interaction effects in a diffuser-augmented hydrokinetic turbine (DAHT) under the terms presented on the generalized actuator disc theory described by Jamieson (2011). Transient RANS CFD methods are employed to obtain the performance, thrust, and average flow speeds at the turbine plane in simulations performed in three comparable cases: bare turbine, bare diffuser and diffuser-augmented turbine. After validating the bare turbine case comparing numerical results against the experiments presented by Fontaine et al. (2013), the axial induction factors are obtained for the three cases based on the average speeds of the turbine plane. The analysis of the results shows the importance of considering rotor-diffuser interaction for the design of diffuser-augmented devices, and that these interaction effects are just as relevant as the bare diffuser and the bare turbine characteristics.
El analisis estructural de multicascos es relativamente complejo debido a que la estructura de un... more El analisis estructural de multicascos es relativamente complejo debido a que la estructura de union entre los cascos introduce esfuerzos adicionales a los tipicos de un monocasco. El trimaran de aluminio presentado en este trabajo fue disenado en el marco del proyecto de investigacion “Diseno Conceptual de Embarcacion de Alto Desempeno para el Transporte de Pasajeros en la Zona Austral de Chile”. El trimaran se dimensiono estructuralmente usando los reglamentos de las sociedades de clasificacion Germanischer Lloyd, Det Norske Veritas y Lloyd´s Register . Para el escantillonado obtenido con cada reglamento se creo un Modelo de Elementos Finitos y el analisis estructural se llevo a cabo para los eventos de slamming y splitting moment . Finalmente se analizaron los resultados y se determinaron las zonas de concentracion de esfuerzos para compararlos con los esfuerzos admisibles y concluir si el dimensionamiento estructural responde en forma adecuada y segura a las cargas de diseno.
ABSTRACT The structural analysis of multihulls is relatively complex due to the bridge connecting... more ABSTRACT The structural analysis of multihulls is relatively complex due to the bridge connecting the hulls, this structure introduces additional stresses to those typical of a monohull. The aluminium trimaran presented in this paper was designed within the research project Conceptual Design of a High Performance Craft for Passenger Transportation in the Southern Region of Chile. The trimaran was structurally calculated according to the rules of Germanischer Lloyd, Det Norske Veritas and Lloyd's Register classification societies. A Finite Element Model was created for each set of scantlings and the structural analysis was carried out introducing slamming, splitting and torsional moment loads. Results were analysed and high stress regions were determined and compared to admissible stresses to conclude the suitability of the structural arrangement to safely withstand the design loads. Finally, a structural optimisation was developed using a discreet approach, where, after an iterative process, geometry of structural elements under high stresses was improved, changing shapes and decreasing material thickness, where it was found to be possible. Through this process, the initial structural sizing was optimised, obtaining a reduction between 17% and 25% in terms of material required to build the boat, without exceeding allowable stresses prescribed by classification rules. on structural design of small multihulls is still relatively scarce. Regarding loads, typical representative sealoads have been prescribed by classification societies with specific focus on multihulls as shown by Blanchard & Chunhua (2007) or Cheng & Mayoss (2007). Typical sealoads for multihulls arise from slamming, splitting moment and torsional moment. Methods for structural design of aluminium and composites were proposed by Hughes (1997). 2 TRIMARAN STUDY CASE The vessel to be analysed is a small aluminium wave piercing trimaran proposed by Tampier (2013) to provide fast transportation of labourers to aquaculture sites in the fiords of Southern Chile, where waves are aligned in either head or following seas. Sea state in these fiords in normally calm and the vessel can operate at the design speed of 30 knots. In moderate sea state 3 and head waves, the vessel is designed to operate at a reduced speed of 20 knots. Main features of this vessel are shown in Table 1, and the General Arrangement is shown in Figure 1.
Ciencia y tecnología de buques
Structural analysis of a multihull is relatively complex since the connecting structure introduce... more Structural analysis of a multihull is relatively complex since the connecting structure introduces additional stress than those typical of a monohull. The aluminum trimaran presented in this work was designed within the framework of the research project “Conceptual Design of a High-performance Vessel for Passenger Transport in Chile’s Austral Zone”. The trimaran was structurally measured using the regulations of classification societies Germanischer Lloyd, Det Norske Veritas y LloydÅLs Register. For the scantlings obtained with each regulation a Finite Element Model was created and the structural analysis for the slamming and splitting moment events was made. The results were analyzed and the stress concentration zones were determined to compare them with admissible stresses and conclude whether the structural sizing adequately and safely responds to the design stresses.
4Th International Ship Design Naval Engineering Congress, Mar 18, 2015
This thesis talks about the development, design, and Evaluation of a horizontal-axis hydrokinetic... more This thesis talks about the development, design, and Evaluation of a horizontal-axis hydrokinetic rotor using NACA (National Advisory Committee for Aeronautics), as well as NREL (National Renewable Energy Laboratory) selected profiles. Different profile’s configuration along the blades of the propeller are used in order design these rotors. These
configurations are assessed in terms of: efficiency, structural integrity, and the possibility of generating cavitation, all this under strict conditions of operation. In order to select the design, which allows determining the most suitable configuration, in other words, the configuration
that most closely fulfills the requirements of the established design, an optimization process has been defined.
Proceedings of the 25th Pan-American Conference of Naval Engineering—COPINAVAL, 2018
Traditionally, towing tanks had been used primarily to assess the resistance of hulls in calm wat... more Traditionally, towing tanks had been used primarily to assess the resistance of hulls in calm water, by means of towing geometrically similar scaled models at equal Froude number, usually without appendages such as rudder, propeller, and so on. When wave-making capability is available, towing tanks can also be used to determine seakeeping occurrences, such as green water effects and slamming, for a range of wave frequencies and amplitudes. This is not different for the University Austral of Chile Towing Tank, which has been involved in resistance and seakeeping tests of a variety of hulls, from fishing vessels to ferries, barges, and passenger ships, over the past 40 years. The development of marine industries other than shipbuilding, such as aquaculture, maritime connectivity of isolated geographical regions, and the harvesting of marine energy from tides and waves, have demanded a new set of tests with adequate models to properly replicate the physics of the full-scale case in the...
Ciencia y tecnología de buques, 2018
Traditionally, Naval and Oceanic Engineering has been focused on research in surface and submarin... more Traditionally, Naval and Oceanic Engineering has been focused on research in surface and submarine ships; and fixed and floating offshore structures. More than 90% of world trade is transported by sea, so it is not surprising that most research efforts have been focused on making merchant ships more efficient and safer. Something similar is happening in the offshore industry driven by the demand for energy. Despite the evident need to perform research in the traditional fields of Naval and Oceanic Engineering, new challenges have caused universities and research centers to tackle new fields of research. This paper presents some of the research and innovations developed at the Institute of Naval and Maritime Sciences (ICNM) of the Austral University of Chile (UACH). These new frontiers for research address problems as diverse as the capturing of energy from waves and currents [1], the development of structures and systems for aquaculture [2], the design of autonomous underwater vehic...
Ocean Engineering, 2017
Abstract The current work presents a novel way to evaluate the interaction effects in a diffuser-... more Abstract The current work presents a novel way to evaluate the interaction effects in a diffuser-augmented hydrokinetic turbine (DAHT) under the terms presented on the generalized actuator disc theory described by Jamieson (2011). Transient RANS CFD methods are employed to obtain the performance, thrust, and average flow speeds at the turbine plane in simulations performed in three comparable cases: bare turbine, bare diffuser and diffuser-augmented turbine. After validating the bare turbine case comparing numerical results against the experiments presented by Fontaine et al. (2013), the axial induction factors are obtained for the three cases based on the average speeds of the turbine plane. The analysis of the results shows the importance of considering rotor-diffuser interaction for the design of diffuser-augmented devices, and that these interaction effects are just as relevant as the bare diffuser and the bare turbine characteristics.
El analisis estructural de multicascos es relativamente complejo debido a que la estructura de un... more El analisis estructural de multicascos es relativamente complejo debido a que la estructura de union entre los cascos introduce esfuerzos adicionales a los tipicos de un monocasco. El trimaran de aluminio presentado en este trabajo fue disenado en el marco del proyecto de investigacion “Diseno Conceptual de Embarcacion de Alto Desempeno para el Transporte de Pasajeros en la Zona Austral de Chile”. El trimaran se dimensiono estructuralmente usando los reglamentos de las sociedades de clasificacion Germanischer Lloyd, Det Norske Veritas y Lloyd´s Register . Para el escantillonado obtenido con cada reglamento se creo un Modelo de Elementos Finitos y el analisis estructural se llevo a cabo para los eventos de slamming y splitting moment . Finalmente se analizaron los resultados y se determinaron las zonas de concentracion de esfuerzos para compararlos con los esfuerzos admisibles y concluir si el dimensionamiento estructural responde en forma adecuada y segura a las cargas de diseno.
ABSTRACT The structural analysis of multihulls is relatively complex due to the bridge connecting... more ABSTRACT The structural analysis of multihulls is relatively complex due to the bridge connecting the hulls, this structure introduces additional stresses to those typical of a monohull. The aluminium trimaran presented in this paper was designed within the research project Conceptual Design of a High Performance Craft for Passenger Transportation in the Southern Region of Chile. The trimaran was structurally calculated according to the rules of Germanischer Lloyd, Det Norske Veritas and Lloyd's Register classification societies. A Finite Element Model was created for each set of scantlings and the structural analysis was carried out introducing slamming, splitting and torsional moment loads. Results were analysed and high stress regions were determined and compared to admissible stresses to conclude the suitability of the structural arrangement to safely withstand the design loads. Finally, a structural optimisation was developed using a discreet approach, where, after an iterative process, geometry of structural elements under high stresses was improved, changing shapes and decreasing material thickness, where it was found to be possible. Through this process, the initial structural sizing was optimised, obtaining a reduction between 17% and 25% in terms of material required to build the boat, without exceeding allowable stresses prescribed by classification rules. on structural design of small multihulls is still relatively scarce. Regarding loads, typical representative sealoads have been prescribed by classification societies with specific focus on multihulls as shown by Blanchard & Chunhua (2007) or Cheng & Mayoss (2007). Typical sealoads for multihulls arise from slamming, splitting moment and torsional moment. Methods for structural design of aluminium and composites were proposed by Hughes (1997). 2 TRIMARAN STUDY CASE The vessel to be analysed is a small aluminium wave piercing trimaran proposed by Tampier (2013) to provide fast transportation of labourers to aquaculture sites in the fiords of Southern Chile, where waves are aligned in either head or following seas. Sea state in these fiords in normally calm and the vessel can operate at the design speed of 30 knots. In moderate sea state 3 and head waves, the vessel is designed to operate at a reduced speed of 20 knots. Main features of this vessel are shown in Table 1, and the General Arrangement is shown in Figure 1.
Ciencia y tecnología de buques
Structural analysis of a multihull is relatively complex since the connecting structure introduce... more Structural analysis of a multihull is relatively complex since the connecting structure introduces additional stress than those typical of a monohull. The aluminum trimaran presented in this work was designed within the framework of the research project “Conceptual Design of a High-performance Vessel for Passenger Transport in Chile’s Austral Zone”. The trimaran was structurally measured using the regulations of classification societies Germanischer Lloyd, Det Norske Veritas y LloydÅLs Register. For the scantlings obtained with each regulation a Finite Element Model was created and the structural analysis for the slamming and splitting moment events was made. The results were analyzed and the stress concentration zones were determined to compare them with admissible stresses and conclude whether the structural sizing adequately and safely responds to the design stresses.
4Th International Ship Design Naval Engineering Congress, Mar 18, 2015
This thesis talks about the development, design, and Evaluation of a horizontal-axis hydrokinetic... more This thesis talks about the development, design, and Evaluation of a horizontal-axis hydrokinetic rotor using NACA (National Advisory Committee for Aeronautics), as well as NREL (National Renewable Energy Laboratory) selected profiles. Different profile’s configuration along the blades of the propeller are used in order design these rotors. These
configurations are assessed in terms of: efficiency, structural integrity, and the possibility of generating cavitation, all this under strict conditions of operation. In order to select the design, which allows determining the most suitable configuration, in other words, the configuration
that most closely fulfills the requirements of the established design, an optimization process has been defined.