The Experts below are selected from a list of 6063 Experts worldwide ranked by ideXlab platform
Steven Hodge - One of the best experts on this subject based on the ideXlab platform.
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the role of modelling and simulation in the preparations for flight trials aboard the queen elizabeth class Aircraft Carriers
Proceedings of the International Naval Engineering Conference and Exhibition (INEC), 2018Co-Authors: M F Kelly, Steven Hodge, Neale Watson, I OwenAbstract:This paper provides a brief overview of how modelling and simulation has been used to inform preparations for First of Class Flight Trials (FOCFT) aboard HMS Queen Elizabeth, the first of the United Kingdom’s two new Queen Elizabeth Class Aircraft Carriers, from the perspective of a collaborative research programme undertaken by industry and academia to develop high-fidelity simulations of the carrier’s ‘airwake’. Computer modelling of the unsteady air flow over the carrier, and of the Aircraft flight dynamics, have been integrated into high-fidelity flight simulators at BAE Systems Warton, and at the University of Liverpool. The Queen Elizabeth Class (QEC) Carriers have primarily been designed to operate the Short Take-Off and Vertical Landing (STOVL) variant of the Lockheed Martin F-35 Lightning II multirole fighter Aircraft and will also operate a range of rotary-wing assets. Computational Fluid Dynamics (CFD) has been used to compute the time-varying air flow over and around the 280m long ship, along the F-35B landing approach path and up to 400m astern of the ship. The paper shows a selection of results from the full-scale CFD analysis, and the results from a small-scale experiment that was conducted to provide confidence in the validity of the computed airwakes. The QEC airwakes have been employed by BAE Systems in its fixed-wing flight simulator at Warton, where test pilots have conducted simulated deck landings for a variety of wind over deck conditions, so providing experience for F-35B test pilots and the ship’s Flying Control (FLYCO) crew ahead of FOCFT, which will be conducted later this year. Airwakes have also been implemented in the HELIFLIGHT-R flight simulator at the University of Liverpool, where helicopter landings to the QEC have been simulated using a generic medium-weight maritime-helicopter model. A selection of results from the helicopter flight simulator trials is presented in terms of the workload ratings reported by test pilots, and these are related to the characteristics of the computed airwake at the landing spots tested. The paper demonstrates how modelling and simulation can be used to reduce both the risk and cost of flight trials, by informing the FOCFT planning process, and by highlighting, in advance of the trials, which wind speed and azimuth combinations may require more focus.
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the development and use of a piloted flight simulation environment for rotary wing operation to the queen elizabeth class Aircraft Carriers
2017Co-Authors: M F Kelly, I Owen, Steven HodgeAbstract:Flight simulation is being used to inform the First of Class Flight Trials for the UK’s new Queen Elizabeth Class (QEC) Aircraft Carriers. The Carriers will operate with the Lockheed Martin F-35B Lightning II fighter Aircraft, i.e. the Advanced Short Take-Off and Vertical Landing variant of the F-35. The rotary wing assets that are expected to operate with QEC include Merlin, Wildcat, Chinook and Apache helicopters. An F-35B flight simulator has been developed and is operated by BAE Systems at Warton Aerodrome. The University of Liverpool is supporting this project by using Computational Fluid Dynamics (CFD) to provide the unsteady air flow field that is required in a realistic flight simulation environment. This paper is concerned with a research project that is being conducted using the University’s research simulator, HELIFLIGHT-R, to create a simulation environment for helicopter operations to the QEC. The paper briefly describes how CFD has been used to model the unsteady airflow over the 280m long Aircraft carrier and how this is used to create a realistic flight simulation environment. Results are presented from an initial simulation trial in which test pilots have used the HELIFLIGHT-R simulator to conduct simulated helicopter landings to two landing spots on the carrier, one in a disturbed air flow and the other in clean air. As expected, the landing to the spot in disturbed air flow requires a greater pilot workload, shows greater deviation in its positional accuracy and requires more control activity. This initial trial is the first of a planned series of simulated helicopter deck landings for different wind angles and magnitudes.
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the queen elizabeth class Aircraft Carriers airwake modelling and validation for astovl flight simulation
2016Co-Authors: M F Kelly, I Owen, Steven HodgeAbstract:This paper outlines progress towards the development of a high-fidelity piloted flight simulation environment for the UK’s Queen Elizabeth Class (QEC) Aircraft Carriers which are currently under construction. It is intended that flight simulation will be used to de-risk the clearance of the F-35B Lightning-II to the ship, helping to identify potential wind-speeds/directions requiring high pilot workload or control margin limitations prior to First of Class Flight Trials. Simulated helicopter launch & recovery trials are also planned for the future. The paper details the work that has been undertaken at the University of Liverpool to support this activity, and which draws upon Liverpool’s considerable research experience into simulated launch and recovery of maritime helicopters to single-spot combat ships. Predicting the unsteady air flow over and around the QEC is essential for the simulation environment; the very large and complex flow field has been modelled using Computational Fluid Dynamics (CFD) and will be incorporated into the flight simulators at the University of Liverpool and BAE Systems Warton for use in future piloted simulation trials. The challenges faced when developing airwake models for such a large ship are presented together with details of the experimental setup being prepared to validate the CFD predictions. Finally, the paper describes experimental results produced to date for CFD validation purposes and looks ahead to the piloted simulation trials of Aircraft launch and recovery operations to the carrier.
M F Kelly - One of the best experts on this subject based on the ideXlab platform.
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the role of modelling and simulation in the preparations for flight trials aboard the queen elizabeth class Aircraft Carriers
Proceedings of the International Naval Engineering Conference and Exhibition (INEC), 2018Co-Authors: M F Kelly, Steven Hodge, Neale Watson, I OwenAbstract:This paper provides a brief overview of how modelling and simulation has been used to inform preparations for First of Class Flight Trials (FOCFT) aboard HMS Queen Elizabeth, the first of the United Kingdom’s two new Queen Elizabeth Class Aircraft Carriers, from the perspective of a collaborative research programme undertaken by industry and academia to develop high-fidelity simulations of the carrier’s ‘airwake’. Computer modelling of the unsteady air flow over the carrier, and of the Aircraft flight dynamics, have been integrated into high-fidelity flight simulators at BAE Systems Warton, and at the University of Liverpool. The Queen Elizabeth Class (QEC) Carriers have primarily been designed to operate the Short Take-Off and Vertical Landing (STOVL) variant of the Lockheed Martin F-35 Lightning II multirole fighter Aircraft and will also operate a range of rotary-wing assets. Computational Fluid Dynamics (CFD) has been used to compute the time-varying air flow over and around the 280m long ship, along the F-35B landing approach path and up to 400m astern of the ship. The paper shows a selection of results from the full-scale CFD analysis, and the results from a small-scale experiment that was conducted to provide confidence in the validity of the computed airwakes. The QEC airwakes have been employed by BAE Systems in its fixed-wing flight simulator at Warton, where test pilots have conducted simulated deck landings for a variety of wind over deck conditions, so providing experience for F-35B test pilots and the ship’s Flying Control (FLYCO) crew ahead of FOCFT, which will be conducted later this year. Airwakes have also been implemented in the HELIFLIGHT-R flight simulator at the University of Liverpool, where helicopter landings to the QEC have been simulated using a generic medium-weight maritime-helicopter model. A selection of results from the helicopter flight simulator trials is presented in terms of the workload ratings reported by test pilots, and these are related to the characteristics of the computed airwake at the landing spots tested. The paper demonstrates how modelling and simulation can be used to reduce both the risk and cost of flight trials, by informing the FOCFT planning process, and by highlighting, in advance of the trials, which wind speed and azimuth combinations may require more focus.
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the development and use of a piloted flight simulation environment for rotary wing operation to the queen elizabeth class Aircraft Carriers
2017Co-Authors: M F Kelly, I Owen, Steven HodgeAbstract:Flight simulation is being used to inform the First of Class Flight Trials for the UK’s new Queen Elizabeth Class (QEC) Aircraft Carriers. The Carriers will operate with the Lockheed Martin F-35B Lightning II fighter Aircraft, i.e. the Advanced Short Take-Off and Vertical Landing variant of the F-35. The rotary wing assets that are expected to operate with QEC include Merlin, Wildcat, Chinook and Apache helicopters. An F-35B flight simulator has been developed and is operated by BAE Systems at Warton Aerodrome. The University of Liverpool is supporting this project by using Computational Fluid Dynamics (CFD) to provide the unsteady air flow field that is required in a realistic flight simulation environment. This paper is concerned with a research project that is being conducted using the University’s research simulator, HELIFLIGHT-R, to create a simulation environment for helicopter operations to the QEC. The paper briefly describes how CFD has been used to model the unsteady airflow over the 280m long Aircraft carrier and how this is used to create a realistic flight simulation environment. Results are presented from an initial simulation trial in which test pilots have used the HELIFLIGHT-R simulator to conduct simulated helicopter landings to two landing spots on the carrier, one in a disturbed air flow and the other in clean air. As expected, the landing to the spot in disturbed air flow requires a greater pilot workload, shows greater deviation in its positional accuracy and requires more control activity. This initial trial is the first of a planned series of simulated helicopter deck landings for different wind angles and magnitudes.
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the queen elizabeth class Aircraft Carriers airwake modelling and validation for astovl flight simulation
2016Co-Authors: M F Kelly, I Owen, Steven HodgeAbstract:This paper outlines progress towards the development of a high-fidelity piloted flight simulation environment for the UK’s Queen Elizabeth Class (QEC) Aircraft Carriers which are currently under construction. It is intended that flight simulation will be used to de-risk the clearance of the F-35B Lightning-II to the ship, helping to identify potential wind-speeds/directions requiring high pilot workload or control margin limitations prior to First of Class Flight Trials. Simulated helicopter launch & recovery trials are also planned for the future. The paper details the work that has been undertaken at the University of Liverpool to support this activity, and which draws upon Liverpool’s considerable research experience into simulated launch and recovery of maritime helicopters to single-spot combat ships. Predicting the unsteady air flow over and around the QEC is essential for the simulation environment; the very large and complex flow field has been modelled using Computational Fluid Dynamics (CFD) and will be incorporated into the flight simulators at the University of Liverpool and BAE Systems Warton for use in future piloted simulation trials. The challenges faced when developing airwake models for such a large ship are presented together with details of the experimental setup being prepared to validate the CFD predictions. Finally, the paper describes experimental results produced to date for CFD validation purposes and looks ahead to the piloted simulation trials of Aircraft launch and recovery operations to the carrier.
I Owen - One of the best experts on this subject based on the ideXlab platform.
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the role of modelling and simulation in the preparations for flight trials aboard the queen elizabeth class Aircraft Carriers
Proceedings of the International Naval Engineering Conference and Exhibition (INEC), 2018Co-Authors: M F Kelly, Steven Hodge, Neale Watson, I OwenAbstract:This paper provides a brief overview of how modelling and simulation has been used to inform preparations for First of Class Flight Trials (FOCFT) aboard HMS Queen Elizabeth, the first of the United Kingdom’s two new Queen Elizabeth Class Aircraft Carriers, from the perspective of a collaborative research programme undertaken by industry and academia to develop high-fidelity simulations of the carrier’s ‘airwake’. Computer modelling of the unsteady air flow over the carrier, and of the Aircraft flight dynamics, have been integrated into high-fidelity flight simulators at BAE Systems Warton, and at the University of Liverpool. The Queen Elizabeth Class (QEC) Carriers have primarily been designed to operate the Short Take-Off and Vertical Landing (STOVL) variant of the Lockheed Martin F-35 Lightning II multirole fighter Aircraft and will also operate a range of rotary-wing assets. Computational Fluid Dynamics (CFD) has been used to compute the time-varying air flow over and around the 280m long ship, along the F-35B landing approach path and up to 400m astern of the ship. The paper shows a selection of results from the full-scale CFD analysis, and the results from a small-scale experiment that was conducted to provide confidence in the validity of the computed airwakes. The QEC airwakes have been employed by BAE Systems in its fixed-wing flight simulator at Warton, where test pilots have conducted simulated deck landings for a variety of wind over deck conditions, so providing experience for F-35B test pilots and the ship’s Flying Control (FLYCO) crew ahead of FOCFT, which will be conducted later this year. Airwakes have also been implemented in the HELIFLIGHT-R flight simulator at the University of Liverpool, where helicopter landings to the QEC have been simulated using a generic medium-weight maritime-helicopter model. A selection of results from the helicopter flight simulator trials is presented in terms of the workload ratings reported by test pilots, and these are related to the characteristics of the computed airwake at the landing spots tested. The paper demonstrates how modelling and simulation can be used to reduce both the risk and cost of flight trials, by informing the FOCFT planning process, and by highlighting, in advance of the trials, which wind speed and azimuth combinations may require more focus.
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the development and use of a piloted flight simulation environment for rotary wing operation to the queen elizabeth class Aircraft Carriers
2017Co-Authors: M F Kelly, I Owen, Steven HodgeAbstract:Flight simulation is being used to inform the First of Class Flight Trials for the UK’s new Queen Elizabeth Class (QEC) Aircraft Carriers. The Carriers will operate with the Lockheed Martin F-35B Lightning II fighter Aircraft, i.e. the Advanced Short Take-Off and Vertical Landing variant of the F-35. The rotary wing assets that are expected to operate with QEC include Merlin, Wildcat, Chinook and Apache helicopters. An F-35B flight simulator has been developed and is operated by BAE Systems at Warton Aerodrome. The University of Liverpool is supporting this project by using Computational Fluid Dynamics (CFD) to provide the unsteady air flow field that is required in a realistic flight simulation environment. This paper is concerned with a research project that is being conducted using the University’s research simulator, HELIFLIGHT-R, to create a simulation environment for helicopter operations to the QEC. The paper briefly describes how CFD has been used to model the unsteady airflow over the 280m long Aircraft carrier and how this is used to create a realistic flight simulation environment. Results are presented from an initial simulation trial in which test pilots have used the HELIFLIGHT-R simulator to conduct simulated helicopter landings to two landing spots on the carrier, one in a disturbed air flow and the other in clean air. As expected, the landing to the spot in disturbed air flow requires a greater pilot workload, shows greater deviation in its positional accuracy and requires more control activity. This initial trial is the first of a planned series of simulated helicopter deck landings for different wind angles and magnitudes.
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the queen elizabeth class Aircraft Carriers airwake modelling and validation for astovl flight simulation
2016Co-Authors: M F Kelly, I Owen, Steven HodgeAbstract:This paper outlines progress towards the development of a high-fidelity piloted flight simulation environment for the UK’s Queen Elizabeth Class (QEC) Aircraft Carriers which are currently under construction. It is intended that flight simulation will be used to de-risk the clearance of the F-35B Lightning-II to the ship, helping to identify potential wind-speeds/directions requiring high pilot workload or control margin limitations prior to First of Class Flight Trials. Simulated helicopter launch & recovery trials are also planned for the future. The paper details the work that has been undertaken at the University of Liverpool to support this activity, and which draws upon Liverpool’s considerable research experience into simulated launch and recovery of maritime helicopters to single-spot combat ships. Predicting the unsteady air flow over and around the QEC is essential for the simulation environment; the very large and complex flow field has been modelled using Computational Fluid Dynamics (CFD) and will be incorporated into the flight simulators at the University of Liverpool and BAE Systems Warton for use in future piloted simulation trials. The challenges faced when developing airwake models for such a large ship are presented together with details of the experimental setup being prepared to validate the CFD predictions. Finally, the paper describes experimental results produced to date for CFD validation purposes and looks ahead to the piloted simulation trials of Aircraft launch and recovery operations to the carrier.
Steven R H Barrett - One of the best experts on this subject based on the ideXlab platform.
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technical economic and environmental assessment of liquid fuel production on Aircraft Carriers
Applied Energy, 2019Co-Authors: Liam J F Comidy, Mark D Staples, Steven R H BarrettAbstract:Abstract The supply chain to deliver fuels to Aircraft Carriers is complex, dangerous, and expensive, and one option to mitigate these risks is to produce fuel at sea. This work quantifies the costs, climate impacts, and physical characteristics of three technology pathways for fuel production onboard Aircraft Carriers: alkaline electrolysis and reverse water gas shift (AE + RWGS); solid oxide electrolysis and RWGS (SOEC + RWGS); and co-electrolysis of steam and CO2. Two design scenarios are evaluated: a small, infrequently operating plant using excess nuclear power (Scenario A); and a large, frequently operating plant with dedicated nuclear capacity (Scenario B). Fuel production costs are quantified using a Monte Carlo techno-economic analysis, ranging from 1.91 to 4.49 and 3.25–4.23 $/L in Scenarios A and B, respectively. The lowest cost technology pathway is AE + RWGS. All technology pathways are shown to offer reductions in life cycle greenhouse gas emissions of 82–86% relative to petroleum JP-5. In Scenario B, the plant volume and weight are estimated at 50–67% and 432% of current Aircraft carrier designs, respectively, highlighting challenges for technical feasibility. Furthermore, increasing plant production capacity and capacity factor is shown to reduce the unit cost of fuel production, but that this is largely offset by the additional costs of dedicated nuclear capacity required at larger scales. The results indicate that fuel production on an Aircraft carrier may be technically feasible, cost competitive, and environmentally beneficial relative to the petroleum fuels currently in use. However, research to further reduce system cost, weight, and volume, including experimental validation, are still required.
Yang Zhe - One of the best experts on this subject based on the ideXlab platform.
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On the Chinese Sea Power and Aircraft Carriers in the Post-cold War Era
Pacific Journal, 2014Co-Authors: Yang ZheAbstract:Sea power is an important element for the rise of Great Powers. In the Post-cold War Era,there has been great development for the Chinese concept of sea power,which shows mainly the strategic sea power,cooperative sea power,composite sea power,economic sea power and maritime territory. As a product of the development of Chinese sea power in the Post-cold War Era,Aircraft Carriers have entered the Chinese Navy battle sequences. The service of Aircraft Carriers will be counterproductive to the sea power concept,and greatly strengthen the material basis of Chinese sea power. This article does a research on the dialectic relationship between Chinese sea power and Aircraft Carriers.
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on the development of chinese navy in the era of sea power and Aircraft Carriers
World Regional Studies, 2013Co-Authors: Yang ZheAbstract:With the accelerated globalization, China is increasingly going abroad. As a media connecting continents of the world, the ocean is becoming more important for China's development in the future. However, Chinese maritime interests are constantly destroyed by neighboring countries. China must develop its own sea power to protect its maritime rights and interests. One core element for sea power development is to build a strong navy, while Chinese Navy is unable to assume this responsibility. To meet the needs of national interests and national strategy, the Chinese navy must make adjustment in services strategy, organizational system, force structure and others, and make great progress in science and technology,and military training.
