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Journal articles on the topic 'Wave motion characteristics'

Author: Grafiati

Published: 6 September 2023

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1

Pan, Wenbo, Meng He, and Cheng Cui. "Experimental Study on Hydrodynamic Characteristics of a Submerged Floating Tunnel under Freak Waves (I: Time-Domain Study)." Journal of Marine Science and Engineering 11, no. 5 (2023): 977. http://dx.doi.org/10.3390/jmse11050977.

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The dynamic response characteristics of a two-dimensional submerged floating tunnel (SFT) under random and freak waves were investigated in the present study. The results demonstrate that (1) the dynamic responses of the SFT under the freak wave are significantly larger than those under the largest wave in the wave train excluding the freak wave, particularly for the motion response. The maximum values of the motion responses induced by the freak wave were several times larger than those induced by the largest wave in the wave train excluding the freak wave, far exceeding the proportion of the

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2

Sanders, Ross H., Jane M. Cappaert, and David L. Pease. "Wave Characteristics of Olympic Breaststroke Swimmers." Journal of Applied Biomechanics 14, no. 1 (1998): 40–51. http://dx.doi.org/10.1123/jab.14.1.40.

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The purpose of this study was to investigate the wave characteristics of breaststroke swimming. Particular emphasis was accorded the question of whether modern breast-stroke is "flylike" (referring to the butterfly stroke) and whether "waves" travel along the body during the breaststroke cycle. Selected body landmarks and the center of mass (CM) of 8 Olympic breaststroke swimmers were quantified. Fourier analysis was conducted to determine the amplitude, frequency composition, and phase characteristics of the vertical undulations of the vertex of the head, shoulders, hips, knees, and ankles. T

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3

Chen, Long Wei, Wei Ming Wang, and Rui Sun. "Correlation of Site Characteristic Period with Predominant Period of Ground Acceleration by a Simplified Model." Applied Mechanics and Materials 238 (November 2012): 864–67. http://dx.doi.org/10.4028/www.scientific.net/amm.238.864.

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Site characteristic period is an important index in seismic zonantion and seismic resistance design. The characteristics of the ground motions are conceptually related with site characteristics. A simplified single-layer model is used for simulating horizontal strata under seismic loading to calibrate the correlation of site characteristic period with the predominant period of ground motion. The analytical results show that the inputted motions were amplified considerably by the site typically for the period components which were close to the site characteristic periods; with the shear wave ve

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4

Li, Chun Liu, and Yun Peng Zhao. "Motion Characteristics of Composite-Type Sea Cage under Pure Wave." Advanced Materials Research 490-495 (March 2012): 3405–9. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.3405.

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To study motion range changes with wave condition and motion relationship between cages, physical model experiments were carried out. The authors designed 2 models of composite-type sea cages. Experimental data obtained by the CCD data acquisition system. The experiment results showed that 1.in the same period, horizontal motion range,vertical motion range and inclination changes of float collar increase with wave height; 2.In the same wave height, horizontal motion range of the float collar increases with period; 3.The laws between vertical motion and period are not obvious 4.The laws between

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5

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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6

Chen, Gong Lian, Wen Zheng Lu, Lei Wang, and Qi Wu. "Study on Far-Field Ground Motion Characteristics." Applied Mechanics and Materials 438-439 (October 2013): 1471–73. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.1471.

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In order to study the far-field ground motion characteristics and the attenuation of seismic waves, the peak ground acceleration (velocity, displacement), time of duration and response spectrum of the seismic waves were analyzed in this paper. Through the investigation of earthquake wave propagation process, the seismic attenuation low was analyzed. This study can provide technical support for the seismic design of long period structures and related engineering application.

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7

Huang, Zhi-Xun. "Negative Velocity Characteristics in Electromagnetism." Physical Science International Journal 27, no. 1 (2023): 25–53. http://dx.doi.org/10.9734/psij/2023/v27i1776.

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Newton mechanics is great, Newton's contribution is indelible. But from Newton's classical mechanics, the definition of velocity (=) must mean that this physical parameter is a vector, so "negative velocity" only means the opposite direction of motion, no other meaning. It is difficult to understand negative velocity within the framework of classical mechanics. However, wave is a special form of material motion, wave mechanics has a unique method and meaning, and its concept and connotation are significantly different from classical mechanics. For example, wave velocity (whether phase velocity

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8

N.M., Khairuddin,, Jaswar Koto, Nur Ain, A.R., Mohd Azhari , J., and Najmie, A. "Experimental Study on Translation Motion Characteristics of Moored Symmetrical Semi-submersible in Regular Waves." Journal of Mechanical Engineering 17, no. 1 (2020): 77–89. http://dx.doi.org/10.24191/jmeche.v17i1.15220.

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This paper proposes to carry out experiment procedures to investigate the translation motion characteristics of symmetrical semi-submersibles in long crest regular waves. The hydrodynamic response of floating structures in waves is required to be modelled correctly to ensure stability and safety. The symmetrical semi-submersible model was constructed based on a scale ratio of 1:81 in this experiment and was installed with horizontal mooring lines in a wave dynamic basin. This paper also discusses the model preparation procedures, including the mooring lines setup, instrument setup and experime

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9

Wang, Y. Z. "Motion and stability of caisson breakwaters under breaking wave impact." Canadian Journal of Civil Engineering 28, no. 6 (2001): 960–68. http://dx.doi.org/10.1139/l01-040.

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The possible motions of caisson breakwaters under dynamic load excitation include vibrating motion, vibratingsliding motion, and vibratingrocking motion. Three models are presented in this paper and are used to simulate the histories of vibratingslidingrocking motions of caissons under breaking wave impact. The effect of the dynamic characteristics of the caissonfoundation system and the motions on the displacement, rotation, sliding force, and overturning moment of caissons are investigated. It is shown that the sliding force of the caisson is different from the breaking wave force direc

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10

Katafuchi, Masaki, Hideyuki Suzuki, Yuya Higuchi, Hidetaka Houtani, Edgard B. Malta, and Rodolfo T. Gonçalves. "Wave Response of a Monocolumn Platform with a Skirt Using CFD and Experimental Approaches." Journal of Marine Science and Engineering 10, no. 9 (2022): 1276. http://dx.doi.org/10.3390/jmse10091276.

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This paper aims to investigate the nonlinear motion characteristics of a monocolumn type floater with skirts numerically and experimentally. Wave calibration, free decay, and regular wave tests were simulated using a computational fluid dynamics (CFD) code OpenFOAM. The experiments were carried out in a wave tank to validate the CFD results. First, wave calibration tests were performed to investigate wave generation, development, propagation, and absorption in the numerical wave tank. Second, the simulation input parameters were calibrated to reproduce the waves generated in the tank experimen

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11

Song, Xuemin, Jianxi Yao, Weiqin Liu, Yaqing Shu, and Feng Xu. "Numerical Generation of Solitary Wave and Its Propagation Characteristics in a Step-Type Flume." Journal of Marine Science and Engineering 11, no. 1 (2022): 35. http://dx.doi.org/10.3390/jmse11010035.

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This work concerns the numerical generation of stable solitary waves by using a piston-type wave maker and the propagation characteristics of a solitary wave in a step-type flume. The numerical generation of solitary waves was performed by solving N-S (Navier–Stokes) equations on the open source CFD (computational fluid dynamics) platform OpenFOAM. To this end, a new module of dynamic boundary conditions was programmed and can be applied to prescribe the horizontal linear motion of a paddle. Two kinds of paddle motions, based on both the first-order and ninth-order solutions of solitary waves,

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12

Suneela, Jangam, and Prasanta Sahoo. "NUMERICAL INVESTIGATION OF INTERCEPTOR EFFECT ON SEA KEEPING BEHAVIOUR OF PLANING HULL ADVANCING IN REGULAR HEAD WAVES." Brodogradnja 72, no. 2 (2021): 73–92. http://dx.doi.org/10.21278/brod72205.

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In this paper an attempt has been made to assess the capability of numerical algorithm based on Reynolds Averaged Navier Stokes (RANS) for predicting the motion characteristics of the planing hull in calm water and regular waves. The focus of the present study is the impact of interceptors on the sea keeping quality of a planing vessel investigated through the application of numerical methods. The wave properties such as wavelength and wave height are taken into consideration to investigate the effect of wave steepness on vessel response. It is found that numerical data can efficiently simulat

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13

Raghukumar, Kaustubha, Grace Chang, Frank Spada, Craig Jones, Tim Janssen, and Andrew Gans. "Performance Characteristics of “Spotter,” a Newly Developed Real-Time Wave Measurement Buoy." Journal of Atmospheric and Oceanic Technology 36, no. 6 (2019): 1127–41. http://dx.doi.org/10.1175/jtech-d-18-0151.1.

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AbstractThe Spotter is a low-cost, real-time, solar-powered wave measurement buoy that was recently developed by Spoondrift Technologies, Inc. (Spoondrift). To evaluate the data quality of the Spotter device, we performed a series of validation experiments that included comparisons between Spotter-derived motions and prescribed wave motions (monochromatic and random waves) on a custom-built, motion-controlled validation stand and simultaneous in-water measurements using a conventional wave measurement buoy, the Datawell DWR-G4 (Datawell). Spotter evaluations included time-domain validation (i.

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14

Wang, Long, Zheng-quan Yang, Jian-ming Zhao, Xiao-sheng Liu, and Yan-feng Wen. "Transmitting Characteristics of Seismic Motion in Super-Deep Overburden Layer Ground." Shock and Vibration 2021 (February 27, 2021): 1–23. http://dx.doi.org/10.1155/2021/8898012.

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Dynamic response characteristics and antiseismic performance of the structures which were constructed on the super-deep overburden layer are affected obviously by the seismic motion characteristics of the super-deep overburden layer foundation. In this paper, the seismic motion characteristics of horizontally stratified super-deep overburdenIn this paper, the seismic motion characteristics of horizontally stratified super-deep overburden based on the research results of on-site in situ tests and indoor material property tests, the horizontal shear layer method that can consider the nonlinear c

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15

Wang, Hsin-Erh, and I.-Chi Chan. "Numerical Investigation of Wave Generation Characteristics of Bottom-Tilting Flume Wavemaker." Journal of Marine Science and Engineering 8, no. 10 (2020): 769. http://dx.doi.org/10.3390/jmse8100769.

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Motivated by the recently developed bottom-tilting wavemaker specially designed for tsunami research, we propose to investigate numerically the wave generation mechanism of this new wave generator. A series of numerical experiments is carried out using a RANS-based computer model to evaluate the effects of wavemaker length, bottom displacement, motion duration, and water depth on the wavelength, wave amplitude, phase speed, and waveform of the leading waves produced by the bottom-motion wave generator. Numerical results fit well with the existing laboratory data. Explicit equations for the wav

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16

Yang, Zhiwen, Jinzhao Li, Huaqing Zhang, Chunguang Yuan, and Hua Yang. "Experimental Study on 2D Motion Characteristics of Submerged Floating Tunnel in Waves." Journal of Marine Science and Engineering 8, no. 2 (2020): 123. http://dx.doi.org/10.3390/jmse8020123.

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Submerged floating tunnel (SFT) is a new type of transportation infrastructure for crossing sea straits in relatively deeper water. Compared with the fixed tunnel, the main challenge in designing a SFT is the stability maintaining in a complex hydrodynamic environment, especially for the wave-induced dynamic load. In this study, a series of systematic experiments were conducted to investigate the 2D motion characteristics (i.e., heave, sway and roll) of the SFT exposed to regular waves. The movement of the SFT model is measured by the image processing method which is a noncontact measurement.

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17

Zhuang, Yuan, and Decheng Wan. "Numerical Study on Ship Motion Fully Coupled with LNG Tank Sloshing in CFD Method." International Journal of Computational Methods 16, no. 06 (2019): 1840022. http://dx.doi.org/10.1142/s0219876218400224.

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In this paper, numerical simulations of ship motion coupled with LNG tank sloshing in waves are considered. The fully coupled problems are performed by our in-house RANS/DES solver, naoe-FOAM-SJTU. The internal tank sloshing and external wave flow are solved simultaneously. The considered model is a three-dimensional simplified LNG FPSO with two prismatic tanks. The ship motion responses are carried out in beam waves to compare with existing experimental data to validate this solver. The coupling effects between ship motion and sloshing tanks are observed. The anti-rolling characteristics are

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18

Xu, Xiaoqiu, Zhongwen Wang, Junwei Han, and Dacheng Cong. "Shock Wave Characteristics of Hydraulic Shock Wave Simulator with Variable Damping." Mathematical Problems in Engineering 2018 (December 30, 2018): 1–12. http://dx.doi.org/10.1155/2018/8359145.

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For simulating the shock wave with high peak force in a short duration, a novel variable damping hydraulic shock wave simulator was developed, and it was used for simulating the cannon recoil motion. The working principle of this simulator was explained with the assistance of established mathematical model and the flow behavior in damping channel was analyzed. The shock wave characteristics curves were obtained by using the numerical computation method. The results showed that the shock wave characteristics were directly related to the sectional area of the damping channel and the damping flui

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19

Yang, Xin Dong, Zuo Chao Wang, Ai Guo Shi, Bo Liu, and Li Li. "Research on Ship Swaying Motion Prediction Based on Multi-Variable Chaotic Time Series Analysis." Advanced Materials Research 712-715 (June 2013): 1550–54. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1550.

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Wind and waves have particularly significant influence upon exertion of naval vessels battle effectiveness. It is urgently necessary to improve the ability of the Navy to carry out combat service in severe sea state normally. This paper aims to obtain the accurate prediction of ship motions with second level predictable time in real waves. According to the characteristics of the ship motion, the research on extremely short-time prediction of ship motion has been carried out based on multi-variable chaotic time series analysis, and the effectiveness of the prediction of ship motion in real wave

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20

Suzuki, Hideyuki, Yuta Sakai, Yasuo Yoshimura, et al. "Non-Linear Motion Characteristics of a Shallow Draft Cylindrical Barge Type Floater for a FOWT in Waves." Journal of Marine Science and Engineering 9, no. 1 (2021): 56. http://dx.doi.org/10.3390/jmse9010056.

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A shallow draft cylindrical barge type floater with footing close to the water surface was experimentally evaluated in waves to investigate non-linear motion characteristics. The floater was designed to be used as an option for FOWT—floating offshore wind turbines. The non-linear mechanism can be promoted due to the viscous force that acts on the footing edges and the footing interaction with the free surface. In general, the observed non-linear viscous damping is modeled as a force proportional to the square of the relative velocity between the floater and the water. Therefore, the viscous da

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21

Shih, Ruey Syan. "Numerical Study of the Characteristics of Wave-Wave Interactions in Multiphase Wave Field Near Coastal Area." Advanced Materials Research 255-260 (May 2011): 2313–17. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.2313.

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Numerical investigations of multiphase irregular wave field are presented by using the BEM, which incorporates the interaction between incoming wave and reflected wave in the coastal area. This study discusses the case of multi-component wave generation using the 2D-NWT, which incorporates the wave-wave interactions between various conditions of incoming waves and high frequency reflected waves, including the variation of wave field and particle trajectory. The surf beats in the surf zone is mainly the cause of the cross-shore motion, and the generations of high frequency harmonics waves, thes

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22

Das, S. N., and S. K. Das. "Determination of coupled sway, roll, and yaw motions of a floating body in regular waves." International Journal of Mathematics and Mathematical Sciences 2004, no. 41 (2004): 2181–97. http://dx.doi.org/10.1155/s0161171204305363.

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This paper investigates the motion response of a floating body in time domain under the influence of small amplitude regular waves. The governing equations of motion describing the balance of wave-exciting force with the inertial, damping, and restoring forces are transformed into frequency domain by applying Laplace transform technique. Assuming the floating body is initially at rest and the waves act perpendicular to the vessel of lateral symmetry, hydrodynamic coefficients were obtained in terms of integrated sectional added-mass, damping, and restoring coefficients, derived from Frank's cl

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23

Cui, Jian, Ralf Bachmayer, Brad deYoung, and Weimin Huang. "Ocean Wave Measurement Using Short-Range K-Band Narrow Beam Continuous Wave Radar." Remote Sensing 10, no. 8 (2018): 1242. http://dx.doi.org/10.3390/rs10081242.

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We describe a technique to measure ocean wave period, height and direction. The technique is based on the characteristics of transmission and backscattering of short-range K-band narrow beam continuous wave radar at the sea surface. The short-range K-band radar transmits and receives continuous signals close to the sea surface at a low-grazing angle. By sensing the motions of a dominant facet at the sea surface that strongly scatters signals back and is located directly in front of the radar, the wave orbital velocity can be measured from the Doppler shift of the received radar signal. The per

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24

Shi, Chang, Xide Cheng, Zuyuan Liu, Kunyu Han, Penghui Liu, and Long Jiang. "Numerical Simulation of the Maneuvering Motion Wake of an Underwater Vehicle in Stratified Fluid." Journal of Marine Science and Engineering 10, no. 11 (2022): 1672. http://dx.doi.org/10.3390/jmse10111672.

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When a vehicle moves underwater, disturbance is generated and a wake remains that destroys the original free surface and produces a new wake. In order to study the mechanism and characteristics of the wave-making wake generated by the maneuvering motion of an underwater vehicle in density-stratified fluid, the k-ε model and the VOF method that is based on the RANS equation were used in this paper to analyze the SUBOFF model in stratified fluid at different drift angles. Numerical simulation of the maneuvering motion was carried out under these angles, and the corresponding changes in flow fiel

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25

Kim, Jun-Beom, Eun-Hong Min, and Weoncheol Koo. "Experimental and Numerical Study on the Characteristics of Free Surface Waves by the Movement of a Circular Cylinder-Shaped Submerged Body in a Single Fluid Layer." Journal of Ocean Engineering and Technology 37, no. 3 (2023): 89–98. http://dx.doi.org/10.26748/ksoe.2023.006.

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Analyzing the interactions of free surface waves caused by a submerged-body movement is important as a fundamental study of submerged-body motion. In this study, a two-dimensional mini-towing tank was used to tow an underwater body for analyzing the generation and propagation characteristics of free surface waves. The magnitude of the maximum wave height generated by the underwater body motion increased with the body velocity at shallow submerged depths but did not increase further when the generated wave steepness corresponded to a breaking wave condition. Long-period waves were generated in

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26

Almar, Rafael, Rodrigo Cienfuegos, Eduardo Gonzalez, et al. "BARRED-BEACH MORPHOLOGICAL CONTROL ON INFRAGRAVITY MOTION." Coastal Engineering Proceedings 1, no. 33 (2012): 24. http://dx.doi.org/10.9753/icce.v33.currents.24.

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A conceptual analysis of the coupling between bars and infragravity waves is performed combining laboratory experiments and numerical modeling. Experiments are carried out in a wave flume with a barred profile. The Boussinesq fully-nonlinear model SERR1D is validated with the laboratory data and a sensitivity analysis is performed next to study the influence on the infragravity wave dynamics of bar amplitude and location, and swash zone slope. A novel technique of incident and reflected motions separation that conserves temporal characteristics is applied. We observe that changing bar characte

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27

Kotani, Akira, Toshiharu Tanaka, and Akira Hirano. "Development of Shock-Wave-Powered Actuators for High Speed Positioning (Second Report: Characteristics of Diaphragmless Shock Tube and Responsiveness of Actuator)." International Journal of Automation Technology 7, no. 5 (2013): 558–63. http://dx.doi.org/10.20965/ijat.2013.p0558.

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Shock tubes experiments are conducted on applications of shock waves to the actuator. The high-pressure and low-pressure sections of a general shock tube are separated by a diaphragm. In this study, a shock wave is generated by “diaphragmless shock tube” which is divided into two sections by a driver piston instead of the diaphragm. We have previously reported on the motion of a driven piston powered by a shock wave. However, not only piston speed but also high responsiveness is required for practical actuators used on manufacturing lines, in industrial robots, etc., The diaphragmless shock tu

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28

Kashiwagi, Masashi. "Hydrodynamic Study on Added Resistance Using Unsteady Wave Analysis." Journal of Ship Research 57, no. 04 (2013): 220–40. http://dx.doi.org/10.5957/jsr.2013.57.4.220.

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It is known that the added resistance in waves can be computed from ship-generated unsteady waves through the unsteady wave analysis method. To investigate the effects of nonlinear ship-generated unsteady waves and bluntness of the ship geometry on the added resistance, measurements of unsteady waves, wave-induced ship motions, and added resistance were carried out using two different (blunt and slender) modified Wigley models. The ship-generated unsteady waves are also produced by the linear superposition using the waves measured for the diffraction and radiation problems and the complex ampl

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29

Fitriadhy, Ahmad, Nurul Aqilah Mansor, and Nur Adlina Aldin. "Heave and Pitch Motions of a Towed Ship in Waves Incorporated with an Asymmetrical Bridle Towline Model." EPI International Journal of Engineering 2, no. 1 (2019): 34–40. http://dx.doi.org/10.25042/epi-ije.022019.07.

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Investigation of a ship towing system performance in waves incorporated with an asymmetrical towline configuration is necessarily to be studied to ensure a towing safety of navigation. To achieve the objective, this paper presents the ship towing motion performance in waves using Computational Fluid Dynamic (CFD) approach. Here, the heave and pitch motions of the towed ship so-called barge has been analysed, where several effects of the towing angle and towing speeds have been taken into account. In the calm water condition, the results revealed that the increase of tow angle was proportional

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30

Cen, W. J., X. H. Du, D. J. Li, and L. N. Yuan. "Oblique Incidence of Seismic Wave Reflecting Two Components of Design Ground Motion." Shock and Vibration 2018 (June 13, 2018): 1–16. http://dx.doi.org/10.1155/2018/4127031.

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The wave field on the artificial boundary was separated into the free field without local topography effect and scattering field induced by local topography effect. The simulation of the free field under obliquely incident waves was conducted. Based on the assumption that the components of design ground motion were treated as the coincidence of oblique P wave and oblique SV wave, the relationship between the oblique input waves and the design ground motion was established in the free field. Further, the contributions to the two components of design ground motion of obliquely incident waves wer

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31

Borcherdt, Roger D., and Leif Wennerberg. "General P, type-I S, and type-II S waves in anelastic solids; inhomogeneous wave fields in low-loss solids." Bulletin of the Seismological Society of America 75, no. 6 (1985): 1729–63. http://dx.doi.org/10.1785/bssa0750061729.

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Abstract The physical characteristics for general plane-wave radiation fields in an arbitrary linear viscoelastic solid are derived. Expressions for the characteristics of inhomogeneous wave fields, derived in terms of those for homogeneous fields, are utilized to specify the characteristics and a set of reference curves for general P and S wave fields in arbitrary viscoelastic solids as a function of wave inhomogeneity and intrinsic material absorption. The expressions show that an increase in inhomogeneity of the wave fields causes the velocity to decrease, the fractional-energy loss (Q−1) t

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32

Jiang, T., T. E. Schellin, and S. D. Sharma. "Horizontal Motions of an SPM Tanker Under Alternative Mooring Configurations." Journal of Offshore Mechanics and Arctic Engineering 117, no. 4 (1995): 223–31. http://dx.doi.org/10.1115/1.2827227.

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Horizontal motions of a tanker single point moored in current, wind, and waves were numerically investigated under four alternative configurations, namely, buoy mooring (SBM), articulated tower mooring (ATM), bow turret mooring (BTM), and internal turret mooring (ITM). The analysis was based on a previously validated, comprehensive mathematical model of the equations of motion in three degrees of freedom (surge, sway, and yaw) that considers five sets of forces: 1) nonlinear quasi-steady hydrodynamic response and control forces; 2) linear memory effects due to radiated waves; 3) nonlinear moor

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33

D'Arrigo, Agatino. "HYDROGEOLOGICAL BREAKING CHARACTERISTICS OF WAVES ABOVE FRESH WATER SUBAQUEOUS SOURCES." Coastal Engineering Proceedings 1, no. 5 (2011): 11. http://dx.doi.org/10.9753/icce.v5.11.

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After a short review of the usefulness of maritime structures, particularly vertical wall breakwaters, long term observations of hydrogeological breaking on the bottom of Italy's Seas, as caused by the subaqueous source of fresh water, are discussed. The correlation between hydrogeological breaking and wave motion perturbation produced by compressed air or by oil is presented. These considerations are related to the observations of Admiral Alessandro Cialdi on the morphological breaking of waves above sand banks, thus producing calmness in the upper water.   Therefore, it appears p

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34

Kawano, Masahiro, Satoshi Matsuda, Kozo Toyoda, and Jun Yamada. "Seismic response of three-dimensional alluvial deposit with irregularities for incident wave motion from a point source." Bulletin of the Seismological Society of America 84, no. 6 (1994): 1801–14. http://dx.doi.org/10.1785/bssa0840061801.

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Abstract The purpose of this article is to further investigate the influence of local site conditions of surface soil layers on seismic ground motion by studying the response of a semi-spherical alluvial deposit model under the more realistic type incident wave field. The incident wave field is a spherical wave radiated from a point source that is situated at the near focal distance and the far focal distance. A plane SH wavelet is also considered for comparison. A least-squares technique is applied to solve the boundary problem. The surface displacements on the alluvial deposit and in the ela

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35

Huang, Yang, and Decheng Wan. "Investigation of Interference Effects Between Wind Turbine and Spar-Type Floating Platform Under Combined Wind-Wave Excitation." Sustainability 12, no. 1 (2019): 246. http://dx.doi.org/10.3390/su12010246.

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In order to further understand the coupled aero-hydrodynamic performance of the floating offshore wind turbine (FOWT) in realistic ocean environment, it is necessary to investigate the interference effects between the unsteady aerodynamics of the wind turbine and different degree-of-freedom (DOF) platform motions under combined wind-wave excitation. In this paper, a validated CFD analysis tool FOWT-UALM-SJTU with modified actuator line model is applied for the coupled aero-hydrodynamic simulations of a spar-type FOWT system. The aero-hydrodynamic characteristics of the FOWT with various platfo

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Yuan, Peiyin, Pingyi Wang, and Yu Zhao. "Innovative Method for Ship Navigation Safety Risk Response in Landslide-Induced Wave." Advances in Civil Engineering 2021 (May 27, 2021): 1–10. http://dx.doi.org/10.1155/2021/6640548.

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When the bank of a reservoir slope slides along a weak structural plane at a high speed, “landslide slamming” will occur in the nearby water. The formation of landslide-induced waves is a serious threat to the safety of wharfs, shore marks, buildings in the water, and vessels navigating in reservoir areas. To ensure the safety of navigating ships, this study proposes a landslide-induced wave water ship navigation safety risk response technology. The propagation characteristics of landslide-induced waves are analysed based on a physical model experiment, and the characteristics of a ship's moti

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Agalarov, Jafar H., Guldasta Akif Mammadova, and Mexseti Akif Rustamova. "Investigation of waves in the strengthened net." Structural Mechanics of Engineering Constructions and Buildings 18, no. 3 (2022): 269–79. http://dx.doi.org/10.22363/1815-5235-2022-18-3-269-279.

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The movements of a reinforced net are considered. Mesh systems are used in various areas of modern technology, aviation, fishing, and construction. In recent years, much attention has been drawn to the complete equations that describe the motion of a deformable thread. In accordance with the studied task, the reinforcement of the net is carried out by adding terms in the equations of motion. In the planar case, the static behavior of the structure is investigated, and equations of motion are derived that allow the study of motion. The problem of wave propagation in deformable filament systems,

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Gao, Xianjiao, Chenghua Li, Tao Liu, Bin Wu, and Mingzhen Wang. "Research on wave motion response characteristics of a seaplane." Journal of Physics: Conference Series 1985, no. 1 (2021): 012031. http://dx.doi.org/10.1088/1742-6596/1985/1/012031.

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Shen, Chao, Bin Zhang, Shenglin Yan, and Xiaoli Fu. "Cloud‐based virtual simulation system of wave motion characteristics." Computer Applications in Engineering Education 30, no. 2 (2021): 609–27. http://dx.doi.org/10.1002/cae.22476.

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Hernández, Lorenzo, and Jose Alzola. "HYDRODYNAMIC ASSESMENT ON MOTION PERFORMANCE CHARACTERISTICS OF GENERIC WAVE ENERGY POINT ABSORBERS." International Journal of Engineering Technologies and Management Research 4, no. 4 (2020): 1–26. http://dx.doi.org/10.29121/ijetmr.v4.i4.2017.72.

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This work condenses various modeling techniques for different Point Absorber configurations. An alternating frequency - time domain model is implemented in MatlabFORTRAN in order to compute the displacement, velocities and the power absorbed in the heave mode for both single and multiple body configurations. Coupling of different degrees of freedom are merely contemplated with regard to a single buoy motion. NEMOH and BEMIO solvers are applied in the solution of Newtons second law according to the Boundary Element Methodology. Initially, this Wave-to-Wire model is validated through comparison

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Chen, Ji-Kang, Guo-Dong Zhang, and Wen-Yang Duan. "Numerical Study of Wave Drift Load and Turning Characteristics of KVLCC2 Ship in Regular Waves Based on TEBEM." Journal of Marine Science and Engineering 10, no. 7 (2022): 993. http://dx.doi.org/10.3390/jmse10070993.

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Maritime traffic has increased considerably in recent years, making energy efficiency and navigation safety of ships more crucial than ever. Hence, a two-time scale model based on the Taylor expansion boundary element method (TEBEM) is proposed to predict ship turning trajectories in regular waves. The maneuvering motion is calculated using a three degrees of freedom MMG model that considers the wave drift loads. TEBEM overcomes the shortcomings of the constant panel method in solving tangential induced velocity at a non-smooth boundary and that of the high-order boundary element method in dea

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Han, Duanfeng, Ting Cui, Lihao Yuan, Yingfei Zan, and Zhaohui Wu. "Monitoring and Analysis of Wave Characteristics during Pipeline End Termination Installation." Processes 7, no. 9 (2019): 569. http://dx.doi.org/10.3390/pr7090569.

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Pipeline end termination (PLET) installation is an essential part of offshore pipe-laying operation. Pipe-laying operations are sensitive to pipe-laying barge motion and marine environmental conditions. Monitoring the field environment can provide a reasonable basis for planning pipe-laying. Therefore, the measurement and analysis of sea wave motion is helpful for the control and operational safety of the pipeline and vessels. In this study, an environmental monitoring system was established to measure wave motion during PLET operation. Fourier transforms were used to process images that were

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Ding, Hongyan, Xing Zhao, Conghuan Le, Puyang Zhang, and Qiaoling Min. "Towing Motion Characteristics of Composite Bucket Foundation for Offshore Wind Turbines." Energies 12, no. 19 (2019): 3767. http://dx.doi.org/10.3390/en12193767.

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Composite bucket foundation (CBF) is an environmentally friendly form of offshore wind power foundation. By virtue of the air-floating subdivision structure in the bucket, the foundation has a self-floating characteristic and can allow for long-distance air-floating towing and transport. In this study, first, a numerical analysis was performed on the towing motion characteristics of CBF, and the formula for foundation stability was deduced; then, we probed into the variation rules of the natural period of the foundation with draft and analyzed the response amplitude operator (RAO) responses, a

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Wang, Zhihao, Yijun Chen, Hang Yuan, Ying Luo, and Qun Zhang. "Real Micro-Doppler Parameters Extraction of Spinning Targets Based on Rotating Interference Antenna." Remote Sensing 14, no. 21 (2022): 5300. http://dx.doi.org/10.3390/rs14215300.

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Micro-Doppler is a unique characteristic of targets with micro-motions, which can provide significant information for target classification and recognition. However, the monostatic radar has the shortcoming of only obtaining the radial micro-motion characteristics. Although the vortex-electromagnetic-wave-based radar has the potential to obtain real micro-motion parameters, it has a high dependence on the mode number and purity of the orbital angular momentum, which greatly restricts its application in the micro-motion parameter extraction. To overcome the above problems, a new radar configura

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Shi, Hong Da, Shui Yu Li, and Dong Wang. "Study on the Motions and Stress of Immersing Tunnel Element under Wave Actions." Applied Mechanics and Materials 328 (June 2013): 614–22. http://dx.doi.org/10.4028/www.scientific.net/amm.328.614.

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The dynamic characteristics of large-scale tunnel element are very important for the process of immersion. In the paper, the motions and stress of the element under wave actions were studied. The linear wave diffraction theory and the three-dimensional source distribution method were applied to calculate the wave loads and motion responses of the tunnel element under different incident wave conditions. In the study, there have no cable on the element. On the basis of the above theories, the stress and the motions of the element were studied. The first order wave forces and the second order wav

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Ying, Zu-Guang, and Yi-Qing Ni. "Dynamic characteristics of infinite-length and finite-length rods with high-wave-number periodic parameters." Journal of Vibration and Control 24, no. 11 (2017): 2344–58. http://dx.doi.org/10.1177/1077546316687676.

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The dynamic characteristics of the infinite-length and finite-length rods with periodic distribution parameters are studied. The differential equation of longitudinal motion of the period-parametric rod is given. The algebraic matrix equation for the wave motion characteristics of the infinite-length periodic rod is derived based on the Bloch theorem and Fourier series. The characteristic frequencies are determined by the matrix eigenvalues which depend on the characteristic wave number and parametric wave number. Then the algebraic matrix equation for the dynamic characteristics of the finite

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Li, Ang, and Yunbo Li. "Numerical and Experimental Study on Seakeeping Performance of a High-Speed Trimaran with T-foil in Head Waves." Polish Maritime Research 26, no. 3 (2019): 65–77. http://dx.doi.org/10.2478/pomr-2019-0047.

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Abstract The longitudinal motion characteristics of a slender trimaran equipped with and without a T-foil near the bow are investigated by experimental and numerical methods. Computational fluid dynamics ( CFD) method is used in this study. The seakeeping characteristics such as heave, pitch and vertical acceleration in head regular waves are analyzed in various wave conditions. Numerical simulations have been validated by comparisons with experimental tests. The influence of large wave amplitudes and size of T-foil on the longitudinal motion of trimaran are analyzed. The present systematic st

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Zhou, Xiaoguo, Qingdian Jiang, Yan Wang, Linfeng Chen, Shuqi Wang, and Kunpeng Wang. "Numerical Simulation of Wave–Current Force Characteristics of Horizontal Floating Cylinder in Heave Motion." Journal of Marine Science and Engineering 10, no. 12 (2022): 1884. http://dx.doi.org/10.3390/jmse10121884.

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This paper presents the characteristics of the heave motion responses and hydrodynamic forces of a horizontal floating circular cylinder during a wave–current interaction. A two-dimensional numerical model based on the CFD (Computational Fluid Dynamics) method for modeling wave flow is validated and verified. The hydrodynamic characteristics of the horizontal floating cylinder during heave motion were calculated and analyzed under the conditions of different k values (stiffness of spring), wave amplitudes, submerged depths, and flow rates. The results show that, with the increase in the k valu

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Gong, Houjun, Xiaoxi Zhang, Nan Gui, Yanping Huang, Xingtuan Yang, and Shengyao Jiang. "Study on the Density Wave Instability in Natural Circulation System under Rolling Conditions." International Journal of Energy Research 2023 (February 3, 2023): 1–16. http://dx.doi.org/10.1155/2023/3249806.

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In the ocean environment, the thermal fluid system installed on the ship moves with the waves. This unsteady transient motion imposes additional body forces on the liquid. Thereby, the thermohydraulic properties of the thermal fluid system are changed, especially for natural circulation systems with a low driving force. Flow instability related to system security is a common two-phase flow system phenomenon. It is an essential subject in the study of thermal-hydraulic characteristics. In this paper, the density wave instability in a low-pressure natural circulation system with several parallel

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Jiang, T., and T. E. Schellin. "Motion Prediction of a Single-Point Moored Tanker Subjected to Current, Wind and Waves." Journal of Offshore Mechanics and Arctic Engineering 112, no. 1 (1990): 83–90. http://dx.doi.org/10.1115/1.2919840.

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Horizontal motions of a tanker attached to a single-point mooring (SPM) terminal were predicted using digital simulation in the time domain. Excitations from steady current, gusting wind, and irregular seaway were included. Hydrodynamic forces generated by the ship’s motion and the action of its propeller and rudder were calculated in accordance with a previously validated, nonlinear quasi-steady four-quadrant maneuvering model, extended to include linear memory effects due to waves generated by the moving ship. Memory effects were approximated by a vectorial recursive state space model corres

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