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Статті в журналах з теми "Heave motion"

Автор: Grafiati

Опубліковано: 10 березня 2023

Оновлено: 19 липня 2025

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1

Lian-zhou, Wang, Guo Chun-yu, Wan Lei, and Su Yu-min. "Numerical Analysis of Propeller During Heave Motion Near a Free Surface." Marine Technology Society Journal 51, no. 1 (2017): 40–51. http://dx.doi.org/10.4031/mtsj.51.1.5.

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AbstractThe interaction between the free surface and the propeller during heave motion near the free surface was analyzed numerically using the Reynolds-Averaged Navier-Stokes (RANS) method. The coupling effect between the rotation and heave motions of the propeller was modeled using a motion equation developed in this study; the heave motion was simplified as a periodic motion based on the sinusoidal motion law; and the transfer of numerical values for unsteady flow fields was implemented using overset grid technology. A comparative analysis of the unsteady thrust coefficient and torque coeff

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2

Tabeshpour, Mohammad Reza, and Reza Hedayatpour. "Analytical investigation of nonlinear heave-coupled response of tension leg platform." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 3 (2018): 699–713. http://dx.doi.org/10.1177/1475090218776430.

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Having deep view in structural response of tension leg platform is important issue not only for response analysis but also for engineering design. Coupling between surge and heave motions of tension leg platform is such a problem. Here, tension leg platform motions are considered only in surge and heave degrees of freedom without pitch effect. The coupled term of heave is a nonlinear differential equation. Because the focus of this article is on this term, therefore, Duffing equation of motion in the surge direction is linearized. The wave forces are calculated using Airy’s wave theory and Mor

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3

Hu, Lifen, Ming Zhang, Zhi-Ming Yuan, Hongxia Zheng, and Wenbin Lv. "Predictive Control of a Heaving Compensation System Based on Machine Learning Prediction Algorithm." Journal of Marine Science and Engineering 11, no. 4 (2023): 821. http://dx.doi.org/10.3390/jmse11040821.

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Floating structures have become a major part of offshore structure communities as offshore engineering moves from shallow waters to deeper ones. Floating installation ships or platforms are widely used in these engineering operations. Unexpected wave-induced motions affect floating structures, especially in harsh sea conditions. Horizontal motions on the sea surface can be offset by a dynamic positioning system, and heave motions can be controlled by a heave compensation system. Active heave compensation (AHC) systems are applied to control vertical heave motions and improve safety and efficie

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4

Xu, Hongyuan, Wei Wang, and Yonghe Xie. "Study of the Hydrodynamic Characteristics of Anti-Heave Devices of Wind Turbine Platforms at Different Water Depths." Polish Maritime Research 31, no. 1 (2024): 35–42. http://dx.doi.org/10.2478/pomr-2024-0004.

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Abstract This paper focuses on the effect of water depth on the hydrodynamics of floating offshore wind turbines with open-hole anti-heave devices. The three-floating-body wind turbine platform is used as the primary research object in this paper. The effect of water depth on the reduction of the heave motion of a floating platform with anti-heave devices is systematically investigated through a series of experiments and numerical simulations. The results show high agreement between the test results and simulations, with larger values of heave motion in deep water. A wind turbine platform with

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5

FITRIADHY, AHMAD, and AMIRA ADAM. "CFD ANALYSIS ON VERTICAL MOTION OF A FULL-SCALE FLOATING JETTY." Journal of Sustainability Science and Management 15, no. 6 (2020): 100–110. http://dx.doi.org/10.46754/jssm.2020.08.009.

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A floating jetty often experiences several vertical motions i.e., heave and pitch motion responses due to harsh environmental condition. This inherently makes discomfort to everyone during berthing on a floating; and even it potentially leads to loss of life due to falling down into the sea. A preliminary analysis using Computational Fluid Dynamics (CFD) simulation is necessary to be conducted to ensure user’s safety. The CFD analysis focused on the interaction between wave motions and the floating jetty and its effects on the vertical motions. The vertical motions of floating jetty were quant

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6

ZIKRY, SYAFIQ, and FITRIADHY. "SEAKEEPING PERFORMANCE OF A HYDROFOIL IN WAVES USING CFD APPROACH." Universiti Malaysia Terengganu Journal of Undergraduate Research 3, no. 3 (2021): 167–76. http://dx.doi.org/10.46754/umtjur.v3i3.228.

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Hydrofoil usually experiences high resistance and excessive vertical motions (heave and pitch) that may affect the passenger’s comfort due to the harsh environmental condition. Therefore, it is necessary to investigate seakeeping performance of a hydrofoil ship in waves due to the presence of a complex hydrodynamic phenomenon. To achieve this objective, an analysis of Computational Fluid Dynamic (CFD) approach on a hydrofoil ship motion is proposed. Several parameters such as Froude Number and foil angle of attack have been taken into account. The results revealed that the subsequent increase

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7

Sow, C. L., Jaswar Koto, and Hassan Abyn. "Semi-Submersible Heave Response Study Using Diffraction Potential Theory with Viscous Damping Correction." Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) 5, no. 1 (2014): 23–29. https://doi.org/10.36842/jomase.v5i1.512.

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This paper discusses the numerical prediction of the semi-submersible’s heave motion. In the previous study, it is observed that the heave motion response predicted by diffraction potential theory is over-estimated in the region where the heave motion is dominated by damping. In this research, viscous damping is included in the calculation to increase the heave damping magnitude in motion equation. The wave force and added mass of semi-submersible is predicted by diffraction potential theory, only the total damping is corrected by sum-up the linear damping from diffraction potential theory wit

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8

Sun, Han-Bing, Shu-Qi Yang, Yang-Fan Xu, and Jia-Feng Xiao. "Prediction of the Pitch and Heave Motions in Regular Waves of the DTMB 5415 Ship Using CFD and MMG." Journal of Marine Science and Engineering 10, no. 10 (2022): 1358. http://dx.doi.org/10.3390/jmse10101358.

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According to the requirement of high-performance development of modern ships, it is necessary to quickly and accurately predict the maneuverability of ships under wave conditions. In this paper, based on the CFD (Computational Fluid Dynamics) method in the commercial software STAR-CCM+, the numerical simulation of roll decay motion, pure heel motion, pure heave motion, and pure pitch motion of ship model 5415 is carried out. The relevant hydrodynamic derivatives are obtained, and the results are in good agreement with the experimental values. The equations of motion related to the heave and pi

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9

Hou, Xianrui, and Xingyu Zhou. "Nonparametric Identification Model of Coupled Heave–Pitch Motion for Ships by Using the Measured Responses at Sea." Journal of Marine Science and Engineering 11, no. 3 (2023): 676. http://dx.doi.org/10.3390/jmse11030676.

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In order to simulate or control the coupled heave–pitch motion of ships in waves as realistically as possible, an appropriate mathematical model must be established in advance. In this paper, a nonparametric identification method, based on a combination of a random decrement technique (RDT) and support vector regression (SVR), was proposed to model the coupled heave–pitch motion of ships by only using the measured random responses at sea. First, a mathematical model was established to describe the coupled heave–pitch motion of ships in irregular waves. Second, the random decrement equation and

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10

Sclavounos, Paul D., and Henning Borgen. "Seakeeping Analysis of a High-Speed Monohull With a Motion-Control Bow Hydrofoil." Journal of Ship Research 48, no. 02 (2004): 77–117. http://dx.doi.org/10.5957/jsr.2004.48.2.77.

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The seakeeping performance is studied of a foil-assisted high-speed monohull vessel using a state-of-the-art three-dimensional Rankine panel method. The vessel is equipped with a bow hydrofoil acting as a passive heave and pitch motion-control device in waves. The formulation of the seakeeping of ships equipped with lifting appendages is developed, and the mechanisms responsible for the reduction of the heave and pitch motions of high- speed vessels equipped with hydrofoils are studied. The sensitivity of the heave and pitch motions on the longitudinal position of the hydrofoil is studied. It

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11

Jiang, Yichen, Guanqing Hu, Zhi Zong, Li Zou, and Guoqing Jin. "Influence of an Integral Heave Plate on the Dynamic Response of Floating Offshore Wind Turbine Under Operational and Storm Conditions." Energies 13, no. 22 (2020): 6122. http://dx.doi.org/10.3390/en13226122.

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The hydrodynamic performance of the floating foundation for offshore wind turbines is essential to its stability and energy harvesting. A semi-submersible platform with an integral heave plate is proposed in order to reduce the vertical motion responses. In this study, we compare the heave, pitch, and roll free decay motions of the new platform with a WindFloat-type platform based on Reynolds-Averaged Navier-Stokes simulations. The differences of the linear and quadratic damping properties between these platforms are revealed. Then, a FAST (Fatigue, Aerodynamics, Structures, and Turbulence) mo

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12

Karambas, Theofanis, and Eva Loukogeorgaki. "A Boussinesq-Type Model for Nonlinear Wave-Heaving Cylinder Interaction." Energies 15, no. 2 (2022): 469. http://dx.doi.org/10.3390/en15020469.

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In the present work, a Boussinesq-type numerical model is developed for the simulation of nonlinear wave-heaving cylinder interaction. The wave model is able to describe the propagation of fully dispersive and weakly nonlinear waves over any finite water depth. The wave-cylinder interaction is taken into account by solving simultaneously an elliptic equation that determines the pressure exerted by the fluid on the floating body. The heave motion for the partially immersed floating cylinder under the action of waves is obtained by solving numerically the body’s equation of motion in the z direc

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13

Siow, C. L., Jaswar Koto, Hassan Abyn, and N. M. Khairuddin. "Linearized Morison Drag for Improvement Heave Response of Semi-Submersible by Diffraction Potential." Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) 6, no. 1 (2014): 8–16. https://doi.org/10.36842/jomase.v6i1.499.

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This research is targeted to improve the semi-submersible heave response prediction by using diffraction potential theory by involving drag effect in the calculation. The comparison to the experimental result was observed that heave motion tendency predicted by the diffraction potential theory is no agreed with motion experimental result when the heave motion is dominated by damping. In this research, the viscous damping and drag force for heave motion is calculated from the drag term of Morison equation. The nonlinear drag term in Morison equation is linearized by Fourier series linearization

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14

Dao, Nguyen Van. "Nonlinear model simulation of ship motion." Vietnam Journal of Mechanics 14, no. 2 (1992): 7–12. http://dx.doi.org/10.15625/0866-7136/10227.

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Nonlinear model simulation of coupling between heave-roll and pitch roll ship motions is considered by means of the asymptotic method of nonlinear mechanics. The purely vertical motion and vertical-angular motion and their stability are studied.

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15

Kim, Jinwoo, and Seongjin Yim. "Design of a Suspension Controller with an Adaptive Feedforward Algorithm for Ride Comfort Enhancement and Motion Sickness Mitigation." Actuators 13, no. 8 (2024): 315. http://dx.doi.org/10.3390/act13080315.

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This paper presents a design method of a suspension controller with an adaptive feedforward algorithm for ride comfort enhancement and motion sickness mitigation. Recently, it was shown that motion sickness is caused by combined heave and pitch motions of a sprung mass within the range of 0.8 and 8 Hz. For this reason, it is necessary to design a suspension controller for the purpose of reducing the heave and pitch vibration of a sprung mass within this range. To represent the heave acceleration and the pitch rate of a sprung mass, a 4-DOF half-car model is adopted as a vehicle model. For easy

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16

Shen, Wen Jun, You Gang Tang, and Li Qin Liu. "Nonlinear Analysis of Stochastic Heave Motion for Truss Spar." Applied Mechanics and Materials 548-549 (April 2014): 531–36. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.531.

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Applying the Path Integral Solution Method, the stochastic heave motion of Truss Spar platform was studied in this paper. Taking a platform for example, probability density function of stochastic heave motion amplitude was calculated under the conditions of different wave excitations. The results show that, the changing process of probability density function in the time domain has an obvious periodicity. As the increasing of external excitation, the heave motion amplitude and speed both increases. Meanwhile, as the increasing of excitation amplitude, the probability density function of heave

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17

Ciba, Ewelina. "Heave Motion of a Vertical Cylinder with Heave Plates." Polish Maritime Research 28, no. 1 (2021): 42–47. http://dx.doi.org/10.2478/pomr-2021-0004.

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Abstract The shape of a vertical cylinder resembles the classic form of a spar platform. Spar platforms are floating platforms that are successfully used in waters of great depths and have several advantages that mean they are readily used in the oil industry. Many of these advantages are also relevant to their application for offshore wind turbines, which is currently being considered. In the hydrodynamic analysis of spar platforms, the determination of their hydrodynamic coefficients plays an important role. They can be determined based on the free decay test. The study presents a method for

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18

Li, Zhou, Liu, and Wang. "Numerical Analysis of Influence of the Hull Couple Motion on the Propeller Exciting Force Characteristics." Journal of Marine Science and Engineering 7, no. 10 (2019): 330. http://dx.doi.org/10.3390/jmse7100330.

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The numerical calculation was performed for the KRISO Container Ship (KCS) hull-propeller-rudder system with different freedom hull motion by employing the Reynolds-Averaged Navier-Stokes (RANS) method and adopting the overset grid. Firstly, the numerical simulation of hydrodynamics for a bare hull with the heave and pitch motion is carried out. The results show that the space non-uniformity of a nominal wake in the disk plane with motion is comparable to the case without motion. However, the time non-uniformity increases sharply and it has a significant positive relationship with the motion a

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19

Ni, Shengke, Zhengjiang Liu, Yao Cai, and Teng Zhang. "A Practical Approach to Numerically Predicting a Maneuvering Vessel in Waves Oriented to Maritime Simulator." Mathematical Problems in Engineering 2020 (October 26, 2020): 1–11. http://dx.doi.org/10.1155/2020/8361951.

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To improve the behavioral realism of maritime simulator, the mathematical model of ship heave and pitch motion in regular waves is proposed. To avoid the influence of irregular frequency by two-dimensional Frank source and sink distribution method, the multiparameter conformal mapping method was adopted to solve the hydrodynamic problem of ship’s transverse sections, and then the integration of the hydrodynamic coefficients and the wave exciting forces for the whole ship hull was obtained using the Salvesen–Tuck–Faltinsen (STF) strip method. The Abkowitz model was used for the horizontal maneu

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20

Hwang, Sung Gu, Gwi Nam Kim, Yong Gil Jung, and Sun Chul Huh. "Safety Assessment of Heave Compensator Using Multi-Body Dynamics." Applied Mechanics and Materials 764-765 (May 2015): 364–68. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.364.

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Heave Compensation system minimizes vessel heave motion during drilling operation of drillship. Heave compensator plays a role as damping form heave motion of drillship such as principle spring of car suspension system. The load transfers on the parts of heave compensator. Stress and deformation of all parts is evaluated to diagnose the stability of the compensator. This study makes a decision on the safety of structure by ANSYS 12.0v workbench.

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21

Li, Yajie, and Yun Long. "Numerical Study on Wave Radiation by a Barge with Large Amplitudes and Frequencies." Journal of Marine Science and Engineering 8, no. 12 (2020): 1034. http://dx.doi.org/10.3390/jmse8121034.

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A two-dimensional boundary element method is used to study the hydrodynamics of a single barge with prescribed motions of large amplitudes and high frequencies. The wave radiation problem is solved in the time domain based on the fully nonlinear potential flow theory. For numerical simulations, special treatments like plunging wave cutting and remeshing approaches are presented in detail. The numerical schemes are verified through comparing with analytical results. Both the generated outgoing wave amplitudes and hydrodynamic coefficients can be calculated with sufficient accuracy. Then, we foc

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22

Guo, Y., Y. P. Jing, M. Jiang, and B. W. Luo. "Disturbance Observer Based Heave Compensation Control for Benthic Coring Drill." Open Mechanical Engineering Journal 7, no. 1 (2013): 129–35. http://dx.doi.org/10.2174/1874155x01307010129.

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Severe environment in deep ocean affects operating reliability and security of coring drill. Adopting heave motion signal measured by accelerometer to confirm heave compensation of coring drill, the compensation control method is proposed using disturbance observer to restrain the disturbance. Then, the disturbance observer is designed. The heave motion simulation for coring drill is done with this control method, and the results show that the heave motion compensation control of coring drill using disturbance observer avoids the disturbance with high tracking quality, and provides high reliab

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23

Fitriadhy, Ahmad, Nur Adlina Aldin, Nurul Aqilah Mansor, and Nur Aqilah Hanis Zalizan. "Heave and Pitch Motion Performances of a Ship Towing System Incorporated with Symmetrical Bridle Towline Model." EPI International Journal of Engineering 2, no. 1 (2019): 28–33. http://dx.doi.org/10.25042/epi-ije.022019.06.

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An investigation on vertical motion characteristics of a ship towing system incorporated with symmetrical bridle towline configuration set a real challenge for the naval architect engineer. This paper presents a Computational Fluid Dynamic (CFD) approach to analyse heave and pitch motion performances in waves. Several towing parameters such as various towline length and towing’s velocity have been taken into account. Here, 1B (barge) is employed in the simulation; and designated as a towed ship. The results revealed that the subsequent increase of the towline lengths has been basically proport

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24

Yim, Solomon C. S., Tongchate Nakhata, Warren A. Bartel, and Erick T. Huang. "Coupled Nonlinear Barge Motions, Part I: Deterministic Models Development, Identification and Calibration." Journal of Offshore Mechanics and Arctic Engineering 127, no. 1 (2005): 1–10. http://dx.doi.org/10.1115/1.1854700.

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This paper focuses on the development of optimal deterministic, nonlinearly coupled barge motion models, identification of their system parameters, and calibration of their prediction capability using experimental results. The ultimate objective is to develop accurate yet sufficiently low degree-of-freedom stochastic models suitable for efficient probabilistic stability and reliability analyses of US Naval barges for preliminary design and operation guideline development (see Part II). First a three-degree-of-freedom (3DOF) fully coupled roll-heave-sway model, which features realistic and prac

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25

Lu, Daohua, Yong Zhang, and Jia Wang. "Adaptive Delay-Free Filtering Based on IMU for Improving Ship Heave Measurement." Sensors 23, no. 24 (2023): 9791. http://dx.doi.org/10.3390/s23249791.

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Ship heave motion measurement is crucial for ensuring vessel stability, navigation precision, and maritime engineering safety. In order to achieve accurate heave motion measurement, a method based on an adaptive digital high–pass filter is proposed. The approach involves constructing a ship heave motion model, conducting an analysis of heave motion, determining the optimal cutoff frequency for the adaptive filter based on an analysis of filtering and sensor errors, and designing an adaptive delay–free digital high–pass filter. Through simulation experiments in various sea conditions and platfo

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26

Zhang, Fengrui, Dayong Ning, Jiaoyi Hou, et al. "Semi-Active Heave Compensation for a 600-Meter Hydraulic Salvaging Claw System with Ship Motion Prediction via LSTM Neural Networks." Journal of Marine Science and Engineering 11, no. 5 (2023): 998. http://dx.doi.org/10.3390/jmse11050998.

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Efficiently salvaging shipwrecks is of the utmost importance for safeguarding shipping safety and preserving the marine ecosystem. However, traditional methods find it difficult to salvage shipwrecks in deep water. This article presents a novel salvage technology that involves multiple hydraulic claws for directly catching and lifting a 2500-ton shipwreck at 600 m depth. To ensure lifting stability, a semi-active heave compensation (SAHC) system was employed for each lifter to mitigate the effects of sea waves. However, the response delays arising from the hydraulic, control, and filtering sys

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27

Siow, C. L., J. Koto, H. Yasukawa, A. Matsuda, D. Terada, and C. Guedes Soares. "Theoretical Review on Prediction of Motion Response using Diffraction Potential and Morison." Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) 18, no. 1 (2015): 8–13. https://doi.org/10.36842/jomase.v18i1.452.

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This paper reviewed the capability of the proposed diffraction potential theory with Morison Drag term to predict the Round Shape FPSO heave motion response. From both the self-developed programming code and ANSYS AQWA software, it can be observed that the diffraction potential theory is over predicting the Round Shape FPSO heave motion response when the motion is dominated by damping. In this study, Morison equation drag correction method is applied to adjust the motion response predicted by diffraction potential theory. This paper briefly present the procedure to integrate the Morison equati

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28

Tao, Longbin, and Shunqing Cai. "Heave motion suppression of a Spar with a heave plate." Ocean Engineering 31, no. 5-6 (2004): 669–92. http://dx.doi.org/10.1016/j.oceaneng.2003.05.005.

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29

Bose, N. "Performance of Chordwise Flexible Oscillating Propulsors Using a Time-Domain Panel Method." International Shipbuilding Progress 42, no. 432 (1995): 281–94. https://doi.org/10.3233/isp-1995-4243201.

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Анотація:

A two-dimensional time-domain constant potential panel method was used for analysis of chordwise flexible oscillating hydrofoils as oscillating propulsors. The oscillatory motions as well as the chordwise deflections were of large amplitude. Results are presented of propulsive thrust coefficient and efficiency over ranges of motion parameters including varied reduced frequency, pitch amplitude and feathering parameter; heave amplitude/chord ratio; pitching axis position; phase between pitching and heaving motions; and deflected shape. The ranges were taken about a favourable operating point fo

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30

Zhang, Jie, Ying Zeng, Yougang Tang, Wenyun Guo, and Zhenkui Wang. "Numerical and Experimental Research on the Effect of Platform Heave Motion on Vortex-Induced Vibration of Deep Sea Top-Tensioned Riser." Shock and Vibration 2021 (March 16, 2021): 1–13. http://dx.doi.org/10.1155/2021/8866051.

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The prediction and control of vortex-induced vibration (VIV) is one of the key problems for riser design. The effect of platform heave motion on VIV of deep sea top-tensioned riser (TTR) is presented by means of numerical simulation and experiment in this research. First, the heave motion was modeled as a parametric excitation, and the governing equation of VIV of riser considering the parametric excitation was established. Then, the dynamic response of TTR was calculated numerically by the finite difference method based on the Van der Pol wake-oscillator model. Finally, a validation experimen

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31

Liu, Kun, Haizhi Liang, Jingpin Ou, Jiawei Ye, and Dongjiao Wang. "Experimental Investigation of the Performance of a Tuned Heave Plate Energy Harvesting System for a Semi-Submersible Platform." Journal of Marine Science and Engineering 10, no. 1 (2022): 45. http://dx.doi.org/10.3390/jmse10010045.

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Heave plates are widely used for improving the sea keeping performance of ocean structures. In this paper, a novel tuned heave plate energy harvesting system (THPEH) is presented for the motion suppression and energy harvesting of a semi-submersible platform. The heave plates are connected to the platform though a power take-off system (PTO) and spring supports. The performance of the THPEH was investigated through forced oscillation tests of a 1:20 scale model. Firstly, the hydrodynamic parameters of the heave plate were experimentally studied under different excitation motion conditions, and

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32

Xu, Jianan, Yiming Wang, Junling Ma, and Yong Zhan. "Cascade Control of Active Heave Compensation Nonlinear System for Marine Crane." Journal of Marine Science and Engineering 11, no. 5 (2023): 1092. http://dx.doi.org/10.3390/jmse11051092.

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During the rough marine environment, heave compensation is used to offset the heave motion of the vessel when a marine crane lifts and lands the load. Thus, load motion and vessel motion are realized decoupled. In previous studies, the interference items such as hydraulic cylinder friction, underwater drag force and nonlinear friction in the active heave compensation system of a marine hydraulic crane are compensated as a concentrated interference force to be estimated. In this paper, we disassembled the interference items; the disturbance observer and adaptive rate are designed to estimate un

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33

Ghofur, Abdul, Aries Sulisetyono, Wibowo Harso Nugroho, Baharuddin Ali, and Moh Muria Armansyah. "The effect of heave-face plates on FOWT heave motion: Fluid dynamic analysis." BIO Web of Conferences 89 (2024): 10002. http://dx.doi.org/10.1051/bioconf/20248910002.

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Анотація:

Renewable energy technology is a topic that has often been raised in many studies lately. To support the 2020-2024 PRN (National Research Priority) program in the Maritime sector, the Researcher has developed FOWT (Floating Offshore Wind Turbine), a Classic SPAR design to operate and serve the eastern Indonesia region. A novelty design, namely the “Motion Reduction Device” (MRD), is installed at the bottom of the FOWT floater intended to increase its natural period and reduce heaving and pitching motion when exposed to environmental loads. The ANSYS FLUENT Computational Fluid Dynamics (CFD) si

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34

Kirk, C. L. "Resonant heave motion of semisubmersible vessels." Ocean Engineering 12, no. 2 (1985): 177–84. http://dx.doi.org/10.1016/0029-8018(85)90080-0.

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35

Kang, Wei, Bingzhou Chen, and Shilin Hu. "Coupling Analysis between the Transonic Buffeting Flow and a Heaving Supercritical Airfoil Based on Dynamic Mode Decomposition." Aerospace 11, no. 9 (2024): 722. http://dx.doi.org/10.3390/aerospace11090722.

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Анотація:

The coupling between a transonic buffeting flow and a supercritical airfoil with harmonic heave motion was studied. A parametric space of the heave frequency and amplitude was investigated using a verified fluid–structural interaction framework. The spatial-temporal flow pattern around the transonic airfoil was studied using dynamic mode decomposition (DMD) to unveil the physical coupling mechanism. The results show three types of flow responses under the heave motion: (I) A buffet frequency response with a λ-shape shock wave structure and recirculation zone at the shock foot. The aerodynamic

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36

Jamal, A. Sulisetyono, and W. D. Aryawan. "Direct Measurement of Motion on Fast Ferries." IOP Conference Series: Earth and Environmental Science 1081, no. 1 (2022): 012036. http://dx.doi.org/10.1088/1755-1315/1081/1/012036.

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Abstract This paper describes a new identification method for the fast ferry motions by using the direct measurements on the ship’s board. The inertial sensor type of the Analog Devices (ADIS) 16364 is selected as a as suitable instrument to measure accelerations and velocity of the ship motions namely heave, pitch, and roll in time domain. Furthermore, the ship motion responses are transferred as the energy spectral density in frequency domain which are identified using the Fast Fourier Transform (FFT) method. For the case study, the measurement equipment was placed on the navigation room of

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37

Gao, Yue Wen, Chun Li, and Xin Cheng. "Performance Research on Tension Leg Platform of Floating Offshore Wind Turbine." Advanced Materials Research 724-725 (August 2013): 645–48. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.645.

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Анотація:

Platform structure is the basic guarantee for safety operation of offshore wind turbine. Based on the boundary element method and combined with multi-body dynamics, analyzing motion response and wave force mechanism to the platform structure, and obtained the dynamic response and the wave force change of the platform structures in time domain, last analyzes the motion response and wave force change of tension leg platform in surge, sway and heave also roll, pitch and yaw direction. The results show that the maximum response of sway and the minimum response of surge have the same direction, it

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38

Q Y Cao, Lixun Hou, Zixuan Wang, et al. "Effect of Interaction of Flapping Hydrofoil Motion Parameters on Thrust Pulsation Performance." International Journal of Maritime Engineering 165, A2 (2023): 135–44. http://dx.doi.org/10.5750/ijme.v165ia2.1202.

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This study presents a novel index to assess the thrust propulsion performance of flapping-hydrofoil, and identifies the order of priority of motion parameters that affect the thrust pulsation amplitude. The flapping motion is simulated using the Udf (user-defined motion) feature in the commercial software Fluent, and the impacts of three flapping motion parameters on flapping thrust are investigated by manipulating these parameters. The results of the numerical simulation indicate that there is a positive correlation between the heave amplitude and the thrust pulsation amplitude. Additionally,

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39

Trslić, Petar, Edin Omerdic, Gerard Dooly, and Daniel Toal. "Neuro-Fuzzy Dynamic Position Prediction for Autonomous Work-Class ROV Docking." Sensors 20, no. 3 (2020): 693. http://dx.doi.org/10.3390/s20030693.

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This paper presents a docking station heave motion prediction method for dynamic remotely operated vehicle (ROV) docking, based on the Adaptive Neuro-Fuzzy Inference System (ANFIS). Due to the limited power onboard the subsea vehicle, high hydrodynamic drag forces, and inertia, work-class ROVs are often unable to match the heave motion of a docking station suspended from a surface vessel. Therefore, the docking relies entirely on the experience of the ROV pilot to estimate heave motion, and on human-in-the-loop ROV control. However, such an approach is not available for autonomous docking. To

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40

Beck, Robert F., and Stergios Liapis. "Transient Motions of Floating Bodies at Zero Forward Speed." Journal of Ship Research 31, no. 03 (1987): 164–76. http://dx.doi.org/10.5957/jsr.1987.31.3.164.

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Linear, time-domain analysis is used to solve the radiation problem for the forced motion of a floating body at zero forward speed. The velocity potential due to an impulsive velocity (a step change in displacement) is obtained by the solution of a pair of integral equations. The integral equations are solved numerically for bodies of arbitrary shape using discrete segments on the body surface. One of the equations must be solved by time stepping, but the kernel matrix is identical at each step and need only be inverted once. The Fourier transform of the impulse-response function gives the mor

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41

Zhang, Yi, Jun Liu, Shuang Liang, Lin Chen, and Yili Chen. "Nonlinear Dynamic Response Characteristics of Deep-water Riserless Drilling-string System Under Combined Excitation of Platform Motion and Current." Academic Journal of Science and Technology 13, no. 3 (2024): 281–309. https://doi.org/10.54097/27f8k681.

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The study develops a model for axial-lateral-torsional (ALT) bidirectional coupling nonlinear vibrations in riserless drill-strings, using energy and finite element methods. The model incorporates environmental factors such as platform motion, sea currents, and wave loads, as well as operational interactions including wellbore contact and the drill-rock interface. Validated with field test results and data from four wells in the South China Sea, the findings emphasize the importance of heave compensation devices in offsetting the effects of sea motions on drilling operations. The analyses indi

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42

Li, Jiangfan, Liang Li, and Xiaofei Wen. "A novel method of estimating ship heave motion based on dual inertial measurement units." Journal of Physics: Conference Series 2183, no. 1 (2022): 012002. http://dx.doi.org/10.1088/1742-6596/2183/1/012002.

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Abstract In order to estimate the ship heave displacement information in real time and accurately, combined with the ship heave motion model, a dual inertial measurement units (IMU) ship heave displacement estimation method is proposed, the corresponding observer is established, and the heave information of the two Imus is fused. The simulation results show that the dual IMU ship heave estimation method has higher accuracy than the single IMU ship heave estimation method.

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43

Lian, Jijian, Junni Jiang, Xiaofeng Dong, Haijun Wang, Huan Zhou, and Pengwen Wang. "Coupled Motion Characteristics of Offshore Wind Turbines during the Integrated Transportation Process." Energies 12, no. 10 (2019): 2023. http://dx.doi.org/10.3390/en12102023.

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The offshore wind turbine (OWT) supported by bucket foundations can be installed in the integrated transportation process by a dedicated vessel. During the integrated transportation process, the wind turbine is considered as a coupling system with the transport ship, which is easily influenced by waves and storms. In view of the motion response and influential factors, the heave and rock stiffness of the entire floating system was proposed, and then the analytical dynamic motion model of the coupling system was established based on the movement mechanism of the traditional floating body in the

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44

Nayfeh, All H. "On the Undesirable Roll Characteristics of Ships in Regular Seas." Journal of Ship Research 32, no. 02 (1988): 92–100. http://dx.doi.org/10.5957/jsr.1988.32.2.92.

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In 1863 Froude observed that a ship whose frequency in pitch (heave) is twice its frequency in roll has undesirable roll characteristics. To explain this phenomenon, Paulling and Rosenberg as well as Kinney assumed the pitch (heave) motion to be a simple harmonic independent of the roll motion. Substituting the pitch (heave) expression into the roll equation, they obtained a Mathieu equation. They found that exponentially growing instabilities can occur for certain pitch amplitudes and frequency ratios. The exponential growth is unrealistic, the result of their neglecting the influence of the

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45

Zhang, Yuan, Yougang Sun, Zhouguo Hu, et al. "Control Performance Analysis of Mining Ship Heave Compensation System Based on Fuzzy Logic Algorithm." Journal Européen des Systèmes Automatisés 55, no. 2 (2022): 213–20. http://dx.doi.org/10.18280/jesa.550208.

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With the depletion of land resources, demands for marine resources mining is increasing, the mining vessels which is known as one of the most important offshore equipment are widely concerned. The motions of wave surges in the marine environment will affect the operation of mining vessels, especially for the heave motion which will cause serious disturbances to the mining vessels during operation, and even the damage of the hull structure and related mining facilities. Hence, it is very necessary to compensate for the heave motion of the mining vessel, and a hydraulic cylinder-based active-pas

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46

Hui, Li, Sun Zhiyong, Han Bingbing, Shao Yuhang, and Deng Baoli. "RESEARCH ON THE MOTION RESPONSE OF AQUACULTURE SHIP AND TANK SLOSHING UNDER ROLLING RESONANCE." Brodogradnja 73, no. 2 (2022): 1–15. http://dx.doi.org/10.21278/brod73201.

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The double-row and double-chamfered aquaculture tank is a special tank structure of the aquaculture ship. The tank sloshing of this structure is coupled with the hull motion, which has an important impact on the safety of the hull motion. In the present study, research on the tank sloshing and hull motion response of aquaculture ships was conducted based on the model seakeeping and tank sloshing tests in regular waves. The test results were compared with the numerical simulation results of solid loading without sloshing. The results showed that the numerical simulation of the pitch motion was

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47

Zeng, Zhi Gang, and Guo Hua Chen. "Adaptive Predictive Based on Equal-Dimension and New Information for the Hydraulic Mechanism of Wave Motion Compensating Platform." Applied Mechanics and Materials 20-23 (January 2010): 236–42. http://dx.doi.org/10.4028/www.scientific.net/amm.20-23.236.

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A wave motion compensating platform has the function of compensating the ship’s generalized heave motion (a coupling result of roll, pitch and heave). It can decrease the impact of ship motion on some sea works and equipments. The hydraulic mechanism of platform system has the characteristics of nonlinear and big inertia. In order to compensate generalized heave motion effectively, an adaptive predictive control policy is used for controlling the hydraulic mechanism. Based on equal-dimension and new information, an automation regressive model can get adaptive multi-step prediction. The model p

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48

Mahmuddin, Faisal, Nurhalim Dwi Putra, and Syerly Klara. "2D Motions Response Analysis of Floating Offshore Wind Turbine with Various Barge Shapes." E3S Web of Conferences 601 (2025): 00084. https://doi.org/10.1051/e3sconf/202560100084.

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Indonesia has the potential to develop floating wind turbines at sea. Therefore, its movement response needs to be analyzed to ensure that the turbine works properly. This research aims to determine the floating offshore wind turbine barge’s movement response with different floater shapes to regular waves from three different directions (0°, 45°, 90°). The movement response of the floating wind turbine was analyzed using the diffraction and radiation analysis methods in Ansys Aqwa. The research results include the RAO curve for the structure in a couple of two degrees of freedom (heave-pitch)

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49

Wulandari, A. I., A. Sulisetyono, and I. K. A. P. Utama. "Numerical Analysis of Seakeeping Performance for Warship Catamaran: the Effects of S/L Ratios and Wave Headings." IOP Conference Series: Earth and Environmental Science 1473, no. 1 (2025): 012021. https://doi.org/10.1088/1755-1315/1473/1/012021.

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Abstract The seakeeping ability of warship catamaran is thoroughly analyzed in this work utilizing numerical methods. Computational Fluid Dynamics (CFD) tests were carried out using Ansys Aqwa at a forward speed of 40 knots, with irregular waves and a Pierson-Moskowitz spectrum. Concurrently, CFD simulations were performed using a boundary element method to compute the Response Amplitude Operators (RAOs) for heave, pitch, and roll motions in various separation-to-length (S/L) ratios and wave directions. The study seeks to provide a comprehensive understanding of how asymmetrical hull warship c

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Kwon, Chae-Won, Su-Young Lee, Do-Sam Kim, and Kwang-Ho Lee. "An Experimental Study on the Effects of Perforated Floating Structures and Submerged Plates for Wave Control and Motion Reduction of Pile-Moored Floating Piers." Journal of Korean Society of Coastal and Ocean Engineers 36, no. 3 (2024): 116–27. http://dx.doi.org/10.9765/kscoe.2024.36.3.116.

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The floating pier is a representative type of floating structure installed along the coast, primarily used as a facility for berthing and mooring ships. Additionally, ongoing attempts have been made to utilize it for various purposes, such as wave control and wave energy conversion structures. In this study, we experimentally investigated the reflection and motion characteristics of a pile-moored floating pier, which allows heave and limited roll motion, with respect to the presence of perforated structures and the attachment of submerged plates. The hydraulic experiment results indicated that

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