The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform

Mirko Kovac - One of the best experts on this subject based on the ideXlab platform.

  • Efficient Aerial–Aquatic Locomotion With a Single Propulsion System
    IEEE Robotics and Automation Letters, 2017
    Co-Authors: Yu Herng Tan, Robert Siddall, Mirko Kovac
    Abstract:

    Aerial–aquatic locomotion would allow a broad array of tasks in robot-enabled environmental monitoring or disaster management. One of the most significant challenges of aerial–aquatic locomotion in mobile robots is finding a propulsion system that is capable of working effectively in both fluids and transitioning between them. The large differences in the density and viscosity of air compared to water means that a single direct propulsion system without adaptability will be inefficient in at least one medium. This paper examines multimodal Propeller propulsion using computational tools validated against experimental data. Based on this analysis, we present a novel gearbox enabling an aerial propulsion system to operate efficiently underwater. This is achieved with minimal complexity using a single Fixed Pitch Propeller system, which can change gear underwater by reversing the drive motor, but with the gearing arranged to leave the Propeller direction unchanged. This system is then integrated into a small robot, and flights in air and locomotion underwater are demonstrated.

Siaw Kiang Chou - One of the best experts on this subject based on the ideXlab platform.

  • Power management of vessel propulsion system for thrust efficiency and emissions mitigation
    Applied Energy, 2016
    Co-Authors: Feiyang Zhao, Woei Wan Tan, Jiasheng Yang, Wenbin Yu, Wenming Yang, Siaw Kiang Chou
    Abstract:

    To meet the stringent gas emissions legislation in marine industry achieving green shipping, the ship operational behavior in actual sailing condition is one of the major concerns for designers and ship owners. In this study, the assessment of fuel consumption and pollutant gas emissions during a container ship operating scenarios was carried out by a hydrodynamic vessel movement model capable of representing the vessel propulsion behavior. The marine engine equipped with turbocharger as well as shafting system and Fixed Pitch Propeller was included in vessel propulsion model by separated sub models connecting the required variables to each other. The propulsion system performance in calm water was well validated by a container ship seakeeping test published in 2003. When sailing encounters heavy weather, the severe ship motion induced by irregular waves bring the thruster very close to water surface, making Propeller susceptible to ventilation and causing huge thrust loss. Step modulation strategy of power management system has been employed to save thrust loss and improve fuel efficiency in this study. It manages to save large thrust degeneration and along with benefit of thrust efficiency and emission mitigation, but at the expense of shortened sailing distance.

Key-pyo Rhee - One of the best experts on this subject based on the ideXlab platform.

  • NEW PREDICTION METHOD ON THE STOPPING ABILITY OF DIESEL SHIPS WITH FIXIED Pitch Propeller
    International shipbuilding progress, 2005
    Co-Authors: Young Jae Sung, Key-pyo Rhee
    Abstract:

    A method is suggested to predict the stopping ability of the diesel ships with Fixed Pitch Propeller. Based on sea trial measurements, the procedure of full astern stopping test is analyzed and modeled as the first order surge differential equation. Coasting with Propeller windmilling state is taken into account for the reliable prediction of stopping ability. Duration of coasting state is determined from the Propeller Pitch ratio and the RPM at which braking-air is supplied. Resistance and astern thrust are estimated from the speed and power at the maximum continuous rating condition. Calculated stopping distance and time are compared with sea trial measurements, and it can be confirmed that our method can be a useful tool to predict the stopping ability of diesel ships.

Yu Herng Tan - One of the best experts on this subject based on the ideXlab platform.

  • Efficient Aerial–Aquatic Locomotion With a Single Propulsion System
    IEEE Robotics and Automation Letters, 2017
    Co-Authors: Yu Herng Tan, Robert Siddall, Mirko Kovac
    Abstract:

    Aerial–aquatic locomotion would allow a broad array of tasks in robot-enabled environmental monitoring or disaster management. One of the most significant challenges of aerial–aquatic locomotion in mobile robots is finding a propulsion system that is capable of working effectively in both fluids and transitioning between them. The large differences in the density and viscosity of air compared to water means that a single direct propulsion system without adaptability will be inefficient in at least one medium. This paper examines multimodal Propeller propulsion using computational tools validated against experimental data. Based on this analysis, we present a novel gearbox enabling an aerial propulsion system to operate efficiently underwater. This is achieved with minimal complexity using a single Fixed Pitch Propeller system, which can change gear underwater by reversing the drive motor, but with the gearing arranged to leave the Propeller direction unchanged. This system is then integrated into a small robot, and flights in air and locomotion underwater are demonstrated.

Yu Hong-liang - One of the best experts on this subject based on the ideXlab platform.

  • Research on Modeling and Simulation of Large Marine Propulsion Plant
    Computer Simulation, 2007
    Co-Authors: Yu Hong-liang
    Abstract:

    Aiming at the deficiencies for current marine propulsion plant simulation models in real-time simulation and calculation precision, a modeling method and a zero-dimension transient simulation model for large marine propulsion plant were proposed. The model includes MAN BW 10L90MC diesel engine, NA70/T9 turbocharger, Fixed Pitch Propeller and diesel engine control system. The simulation experiments demonstrate the steady and dynamical results matching properly the voyage trial ones, and the simulation error is less than 5%. The model can be used for engine performance analyzing and prediction as well as the design and optimization of governor system.