Multihull ships are widely used for sea transportation, and those with four hulls are known as quadramarans. Hull position configurations of a quadramaran include the diamond, tetra, and slice. In general, multihull v...Multihull ships are widely used for sea transportation, and those with four hulls are known as quadramarans. Hull position configurations of a quadramaran include the diamond, tetra, and slice. In general, multihull vessels traveling at high speeds have better hydrodynamic efficiency than monohull ships. This study aims to identify possible effects of various quadramaran hull position configurations on ship resistance for hull dimensions of 2 m length, 0.21 m breadth, and 0.045 m thickness. We conducted a towing test in which we varied the hull spacing and speed at Fr values between 0.08 and 0.62 and measured the total resistance using a load cell transducer. The experimental results reveal that the lowest total resistance was achieved with a diamond quadramaran configuration at Fr = 0.1-0.6 and an effective interference factor of up to 0.35 with S/L = 3/10 and R/L = 1/2 at Fr = 0.62.展开更多
The present work considers a scenario that a multiactuator-sensor network neutralizes poisonous gas and tracks the pollution sources in a bounded area.A novel algorithm is proposed to minimize the system information u...The present work considers a scenario that a multiactuator-sensor network neutralizes poisonous gas and tracks the pollution sources in a bounded area.A novel algorithm is proposed to minimize the system information uncertainty while reaching balance on the workload of actuators.The method combines the centroidal Voronoi tessellations(CVT)with a consensus strategy.The CVT of the region insures a local optimal position configuration of the actuators,thus the sensing uncertainty can be minimized.The consensus algorithm utilizes the connection information among actuators,and helps them to reach a common workload.The consensus component will be terminated or suppressed when the workload is averaged.The consensus component may postpone the realization of CVT configuration.But it could be viewed as a perturbation that helps the actuators jump out of the local optimal CVT configuration.As a result,the information uncertainty may be further reduced.Comparison is drawn between the pure CVT algorithm and the method with consensus strategy.Simulations validated the proposed approach.展开更多
基金sponsored by the Directorate of Research and Community Services,University of Indonesia(Hibah PUPT-Tambahan UI 2015)
文摘Multihull ships are widely used for sea transportation, and those with four hulls are known as quadramarans. Hull position configurations of a quadramaran include the diamond, tetra, and slice. In general, multihull vessels traveling at high speeds have better hydrodynamic efficiency than monohull ships. This study aims to identify possible effects of various quadramaran hull position configurations on ship resistance for hull dimensions of 2 m length, 0.21 m breadth, and 0.045 m thickness. We conducted a towing test in which we varied the hull spacing and speed at Fr values between 0.08 and 0.62 and measured the total resistance using a load cell transducer. The experimental results reveal that the lowest total resistance was achieved with a diamond quadramaran configuration at Fr = 0.1-0.6 and an effective interference factor of up to 0.35 with S/L = 3/10 and R/L = 1/2 at Fr = 0.62.
基金Supported by National Natural Science Foundation of China(60805035/F0306)National Science Fund for Distinguished Young Scholars(60925011)
文摘The present work considers a scenario that a multiactuator-sensor network neutralizes poisonous gas and tracks the pollution sources in a bounded area.A novel algorithm is proposed to minimize the system information uncertainty while reaching balance on the workload of actuators.The method combines the centroidal Voronoi tessellations(CVT)with a consensus strategy.The CVT of the region insures a local optimal position configuration of the actuators,thus the sensing uncertainty can be minimized.The consensus algorithm utilizes the connection information among actuators,and helps them to reach a common workload.The consensus component will be terminated or suppressed when the workload is averaged.The consensus component may postpone the realization of CVT configuration.But it could be viewed as a perturbation that helps the actuators jump out of the local optimal CVT configuration.As a result,the information uncertainty may be further reduced.Comparison is drawn between the pure CVT algorithm and the method with consensus strategy.Simulations validated the proposed approach.
