Hydrodynamic optimization of a high-speed vessel by means of simulation-based design methodology: part 2—multi-objective optimization DOI
Hasan Timurlek, Bekir Şener

Journal of Marine Science and Technology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 21, 2024

Язык: Английский

Safety Analysis of Initial Separation Phase for AUV Deployment of Mission Payloads DOI Creative Commons
Zhengwei Wang,

Haitao Gu,

Jichao Lang

и другие.

Journal of Marine Science and Engineering, Год журнала: 2024, Номер 12(4), С. 608 - 608

Опубликована: Март 31, 2024

This study verifies the effects of deployment parameters on safe separation Autonomous Underwater Vehicles (AUVs) and mission payloads. The initial phase is meticulously modeled based computational fluid dynamics (CFD) simulations employing cubic constitutive Shear Stress Transport (SST) k-ω turbulence model overset grid technologies. characterized by a 6-degree-of-freedom (6-DOF) framework incorporating Dynamic Fluid-Body Interaction (DFBI), supported empirical validation. SST demonstrates superior performance in managing flows adverse pressure gradients separation. DFBI entails computationally modeling fluid–solid interactions during motion or deformation. utilization grids presents several advantages, including enhanced efficiency concentrating resources solely regions interest, simplified handling intricate geometries moving bodies, adaptability adjusting to accommodate changing simulation conditions. research analyzes payloads’ trajectories attitude adjustments after release from AUVs under various cruising speeds dynamics, such as descent angular velocities. Additionally, this evaluates varying ocean currents at different depths safety. Results indicate that interaction between payloads increases higher navigational speeds, reducing speed degrading stability. As drop velocities increase, fast transition through AUV’s immediate flow field promotes core process pitch angle management upon deployment. Optimizing pitching velocity prolongs time for reach their maximum angle, thus decreasing horizontal displacement improving Deploying greater alleviates influence currents, thereby disturbances payload

Язык: Английский

Процитировано

3

Influence of resistance due to locomotion mechanism configurations of a new high-speed amphibious vehicle (HSAV-Ⅱ) DOI
Bolong Liu,

Xiaojun Xu,

Dibo Pan

и другие.

Ocean Engineering, Год журнала: 2023, Номер 283, С. 115175 - 115175

Опубликована: Июнь 21, 2023

Язык: Английский

Процитировано

8

Numerical analysis on hydrodynamic performance and hydrofoil optimization for amphibious vehicles DOI Open Access
Dibo Pan, Xiaojun Xu, Bolong Liu

и другие.

Physics of Fluids, Год журнала: 2023, Номер 35(8)

Опубликована: Авг. 1, 2023

A numerical approach is established to study the hydrodynamic performance using an amphibious transport vehicle (ATV) as a research object. Numerical calculation based on Reynolds average Navier–Stokes method studied in terms of first layer grid height, surface meshing partition scale, and prismatic coefficient. Through uncertainty analysis, correctness convergence are verified. Towing tests conducted compare experimental data with simulation results, which validated reliability under all working conditions. Results show that will affect simulated error 3.91% for resistance 4.21% trim, meeting requirements analysis accuracy. Based proposed approach, optimization design carried out improve ATV. Effects bow plate angle, stern flap install height studied. Latin hypercube used sampling design, Kriging applied establish approximate model. The cross-validation leave-one-out method. Particle swarm parameter optimization, optimized configuration verified approach. indicate combination shows excellent improvement vehicles. model only 0.292%, fully verifies its accuracy effectiveness. ATV best drag reduction 38.81% compared original

Язык: Английский

Процитировано

6

Determination of the resistance to motion of a cargo train when driving without a drive DOI Creative Commons
Wojciech Sawczuk, Sławomir Kołodziejski, Armando Miguel Rilo Cañás

и другие.

Silniki Spalinowe/Combustion Engines, Год журнала: 2024, Номер unknown

Опубликована: Март 2, 2024

The issue related to the motion resistance of a rail vehicle is very important for energy, environmental and energy consumption as well performance with dynamic points. latter aspect applies in particular traction vehicles. article presents several models movement freight train used by various railway authorities, Polish foreign rolling stock. values obtained from were verified against tested carrying aggregate. On basis records locomotive recorder, linear speed changes over time coasting paths (without drive) determined. train, stop determined on UIC 544-1 card, which analyzed train.

Язык: Английский

Процитировано

2

Experimental and Numerical Study on Influence of Wheel Attachments on Resistance Performance of Amphibious Vessel for Marine Debris Collection DOI Creative Commons
W.B. Jeong, Seol Nam, Jong-Chun Park

и другие.

Journal of Marine Science and Engineering, Год журнала: 2024, Номер 12(4), С. 570 - 570

Опубликована: Март 27, 2024

This study aims to investigate the influence of wheel configurations on hydrodynamic resistance an amphibious vessel through experiments and simulations. To evaluate performance associated with attachments, three were examined: without caterpillars, both caterpillars shoe−paddles. A comprehensive series computational fluid dynamics (CFD) simulations conducted for these attachment types, complemented by experimental validations. The Volume-of-Fluid (VOF) model was employed in CFD capture free surface movement, Dynamic Fluid–Body Interaction (DFBI) adopted represent two-degree-of-freedom motion vessel, specifically trim sinkage. total derived from calculated across a range Froude numbers (Fns), including design speed target validated tests wave basin equipped towing facility. analysis indicated general increase when attachments added vessel. Remarkably, at (Fn = 0.27), shoe−paddles exceeded that configuration any more than 75.7%. These results provide crucial insights preliminary stage vessels, particularly those intended marine debris collection hard-to-reach areas.

Язык: Английский

Процитировано

1

Research on the resistance and maneuvering characteristics of an amphibious transport vehicle and the influence of stern hydrofoil DOI
Bolong Liu, Dibo Pan,

Xiaojun Xu

и другие.

Ocean Engineering, Год журнала: 2023, Номер 293, С. 116592 - 116592

Опубликована: Дек. 27, 2023

Язык: Английский

Процитировано

2

Experimental and CFD investigation on resistance reduction of hydrofoils for amphibious vehicles DOI
Dibo Pan, Bolong Liu,

Xiaojun Xu

и другие.

Ships and Offshore Structures, Год журнала: 2024, Номер unknown, С. 1 - 14

Опубликована: Фев. 15, 2024

Resistance characteristics of amphibious vehicles are crucial for their sailing speed and battlefield survivability. This study proposes the installation hydrofoils at wheel cavity to reduce resistance enhance performance. Two hydrofoil designs four shapes analyzed determine optimal drag reduction design. Towing tests numerical simulations employed investigate evaluate hydrodynamic performance vehicles. The impact on is analysed elucidated through a comprehensive analysis surface pressure distribution, attitude, energy consumption in flow field. Results demonstrate that, except elongation-hydrofoil, other three all show significant optimisation medium high speeds Fr>0.5, with improved effectiveness as increases. Among shapes, curve-hydrofoil exhibits best overall effect (18%) peak compression ability (6.68%), owing its ample lift force trim capability.

Язык: Английский

Процитировано

0

Improving the Hydrodynamic Performance of Underwater Tags for Blue Shark Monitoring DOI Creative Commons
José Azevedo, Violeta Carvalho, Tiago Bartolomeu

и другие.

Inventions, Год журнала: 2024, Номер 9(3), С. 48 - 48

Опубликована: Апрель 26, 2024

The use of tag devices in marine environments has become indispensable attaining a better understanding life and contributing to conservation efforts. However, the successful deployment operation underwater tags both depend significantly on their hydrodynamic characteristics, particularly resistance motion stability various environmental conditions. Herein, comprehensive study characteristics optimization an designed for monitoring blue sharks is presented. Firstly, validation process conducted by comparing computational fluid dynamics (CFD) results with experimental data from Myring’s study, focusing tag’s body impact operational Subsequently, validated CFD model applied assess performance under different flow conditions, velocities, angles attack. Through iterative simulations, including mesh independence studies boundary condition adjustments, identifies key parameters influencing stability. Furthermore, paper proposes implements design modifications, incorporation stabilizing fins, aimed at minimizing improving equilibrium position. effectiveness these enhancements demonstrated through comparative analysis pitching moments preliminary optimized configurations. Overall, provides valuable insights into behavior offers practical recommendations optimizing minimize interference movement tagged animals.

Язык: Английский

Процитировано

0

Energy efficiency research of propulsion system for series-parallel hybridization of amphibious vehicles DOI Creative Commons

Xiaojun Sun,

Fengmei Xin,

Kun Gao

и другие.

Heliyon, Год журнала: 2024, Номер 10(15), С. e35085 - e35085

Опубликована: Июль 23, 2024

The series-parallel hybrid system has attracted much attention from scholars for its effective integration of the power advantages and operating characteristics different sources, which is influenced by international emission regulations, energy-saving reduction policies. As such, a powertrain introduced to amphibious vehicle, an innovative topology architecture proposed. Meanwhile, operation mode energy efficiency are investigated during working process. Firstly, flow simulation model gas-electric propulsion constructed using modular modeling approach. Secondly, four modes, namely mechanical propulsion, electric charging mode, were formulated due fact that multiple forms sources in form natural gas engine reversible motor. states under modes. comprehensive investigation associated with storage start-up was conducted each specific mode. results research indicated can reach up 35.15 %, gain wide range motor's high efficiency. obtain highest 35.88 fully demonstrates coordinating complementing two This also provides theoretical empirical support optimizing matching formulating management strategies.

Язык: Английский

Процитировано

0

Hydrodynamic optimization of a high-speed vessel by means of simulation-based design methodology: part 2—multi-objective optimization DOI
Hasan Timurlek, Bekir Şener

Journal of Marine Science and Technology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 21, 2024

Язык: Английский

Процитировано

0