Results 11 to 20 of about 29,621 (297)
Numerical Assessment of Roll Motion Characteristics and Damping Coefficient of a Ship
Journal of Marine Science and Engineering, 2018 Accurate calculation of the roll damping moment at resonance condition is essential for roll motion prediction. Because at the resonance condition, the moment of inertia counteracts restoring moment and only the damping moment resists increase in the ...
S.S. Kianejad +3 more
doaj +5 more sources
Short-Term Prediction of Ship Roll Motion in Waves Based on Convolutional Neural Network
Journal of Marine Science and EngineeringIn this study, a short-term prediction method for ship roll motion in waves based on convolutional neural network (CNN) is presented. Firstly, based on the ship roll motion equation, the data for free roll attenuation motion in still water, roll motion ...
Xianrui Hou, Sijun Xia
doaj +4 more sources
Normal variation in pelvic roll motion pattern during straight-line trot in hand in warmblood horses [PDF]
Scientific Reports, 2023 In horses, hip hike asymmetry, i.e. left–right difference in hip upwards movement during hind limb protraction in trot, is a crucial lameness sign.
A. Byström +7 more
doaj +2 more sources
Ship roll motion prediction based on ℓ1 regularized extreme learning machine. [PDF]
PLoS ONE, 2018 In this paper, a new method is proposed for prediction of ship roll motion based on extreme learning machine (ELM). To improve the prediction accuracy and avoid over or under fitting, two techniques are adopted to select the appropriate structure of ELM.
Binglei Guan +3 more
doaj +2 more sources
Study on Roll Motion Characteristics of a Rectangular Floating Structure in Regular Waves [PDF]
한국해양공학회지, 2019 This study focused on the roll motion characteristics of a two-dimensional (2D) rectangular floating structure under regular beam sea conditions. An experiment was conducted in a 2D wave tank for a roll free decay test in calm water and the roll motion ...
Min-Gyu Kim +5 more
doaj +2 more sources
Influence of Variable Acceleration on Parametric Roll Motion of a Container Ship [PDF]
Journal of Eta Maritime Science, 2016 Ship operators increase or decrease thrust force of ships to avoid parametric roll motion. These operations cause varying acceleration values. In this study, influence of variable acceleration and deceleration of ships on roll motion is investigated in ...
Emre PEŞMAN
doaj +2 more sources
Control of Ship Roll Motion [PDF]
, 2014 The undesirable effects of roll motion of ships (rocking about the longitudinal axis) became noticeable in the mid-nineteenth century when significant changes were introduced to the design of ships as a result of sails being replaced by steam engines and the arrangement being changed from broad to narrow hulls.
Perez, Tristan, Blanke, Mogens
openaire +3 more sources
Journal of Marine Science and Engineering, 2023 The study of hydrodynamic characteristics of floating double-rotor horizontal axis tidal current turbines (FDHATTs) is of great significance for the development of tidal current energy. In this paper, the effect of roll motion on a FDHATT is investigated
Muyu Zhao, Ying Chen, Jin Jiang
doaj +2 more sources
Roll Motion Prediction of Unmanned Surface Vehicle Based on Coupled CNN and LSTM
Future Internet, 2019 The prediction of roll motion in unmanned surface vehicles (USVs) is vital for marine safety and the efficiency of USV operations. However, the USV roll motion at sea is a complex time-varying nonlinear and non-stationary dynamic system, which varies ...
Wenjie Zhang +3 more
doaj +2 more sources
Influence of initial heeling angle on ship roll motion response
Zhongguo Jianchuan Yanjiu, 2022 Objectives In this work, the influence of the initial heeling angle on the roll motion response of a ship in random beam wave is studied. MethodsSpecifically, the path integration method is applied to solve the Fokker-Planck equation, which governs the ...
Zewen ZHANG +4 more
doaj +1 more source