检索结果-南通市图书馆

预测规则波浪中船舶运动和载荷的频域三维计算机程序

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

哈尔滨工程大学学报（英文版） 2024年第1期23卷 64-73页

作者： Arash Abbasnia Serge Sutulo c.guedes soares centre for Marine Technology and Engineering(cENTEc) Instituto Superior TécnicoUniversidade de Lisboa1049-001 LisboaPortugal

The development of an in-house computer program for determining the motions and loads of advancing ships through sea waves in the frequency domain,is described in this *** code is based on the potential flow formulation and originates from a double-body code enhanced with the regular part of the velocity potential computed using the pulsing source Green *** code is fully developed in c++language with extensive use of the object-oriented *** code is capable of estimating the excitation and inertial radiation loads or arbitrary incoming wave frequencies and incidence *** hydrodynamic responses such as hydrodynamic coefficients,ship motions,the vertical shear force and the vertical bending moment are estimated.A benchmark container ship and an LNG carrier are selected for testing and validating the computer *** obtained results are compared with the available experimental data which demonstrate the acceptable compliance for the zero speed whereas there are some discrepancies over the range of frequencies for the advancing ship in different heading angles.

关键词： Frequency domain Advancing ships Diffraction theory Pulsing green’s function Boundary integral equation

采用解析和数值方法分析浮动式矩形浮箱的波浪诱导载荷研究

在线全文

学校读者我要写书评

暂无评论

哈尔滨工程大学学报（英文版） 2024年第1期23卷 113-126页

作者： Sarat chandra Mohapatra Iuri Baldaconi da Silva Bispo Yuchan Guo c.guedes soares center for Marine Technology and Ocean Engineering(cENTEc) Instituto Superior TécnicoUniversidade de LisboaLisboa 1049-001Portugal

A three-dimensional mathematical hydrodynamic model associated with surface wave radiation by a floating rectangular box-type structure due to heave,sway,and roll motions in finite water depth is investigated based on small amplitude water wave theory and linear structural *** analytical expressions for the radiation potentials,wave forces,and hydrodynamic coefficients are presented based on matched eigenfunction expansion method(MEFEM).The correctness of the analytical results of wave forces is compared with the construction of a numerical model using the open-source boundary element method code *** addition,the present result is compared with the existing published experimental results available in the *** effects of the different design parameters on the floating box-type rectangular structure are studied by analyzing the vertical wave force,horizontal wave force,torque,added mass,and damping coefficients due to the heave,sway,and roll motions,and the comparison analysis between the forces is also analyzed in ***,the effect of reflection and transmission coefficients by varying the structural width and drafts are analyzed.

关键词： Mathematical model MEFEM Box-type structure BEM code NEMOH Wave forces

Modified Joint Distribution of Wave Heights and Periods

在线全文

学校读者我要写书评

暂无评论

china Ocean Engineering 2016年第3期30卷 359-374页

作者： H.D.Zhang c.guedes soares centre for Marine Technology and Ocean Engineering (cENTEc) Instituto Superior Técnico Universidade de Lisboa

The modified versions of the linear theoretical model of Longuet-Higgins （1983） are derived in this work and also compared with the laboratory experiments carried out in MAR1NTEK. The main feature of modifications is to replace the mean frequency in the formulation with the peak frequency of the wave spectrum. These two alternative forms of joint distributions are checked in three typical random sea states characterized by the initial wave steepness. In order to further explore the properties ＆these models, the associated marginal distributions of wave heights and wave periods are also researched with the observed statistics and some encouraging results are obtained.

关键词： Longuet-Higgins joint distribution mixed sea state nonlinear wave series wave height wave period

Interaction between surface gravity wave and submerged horizontal flexible structures

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2018年第3期30卷 481-498页

作者： Sarat chandra Mohapatra Trilochan Sahoo c.guedes soares centre for Marine Technology and Ocean Engineering (cENTEc) Instituto Superior TécnicoUniversidade de Lisboa Department of Ocean Engineering and Naval Architecture Indian Institute of Technology

Interactions between surface gravity wave and submerged horizontal flexible structures are studied under the assumption of small amplitude water wave theory and structural response. The generalized dispersion relation associated with surface gravity wave interaction with submerged horizontal flexible plate is analyzed to understand the characteristics of the two propagating modes due to the presence of the free surface and submerged horizontal plate. The phase and group velocities are studied in order to analyze the effect of submerged flexible plate on gravity wave motion. The expansion formulae based on Green’s function technique and eigenfunction expansion method using Fourier transform with appropriate orthogonal mode-coupling relation associated with surface gravity wavemaker problems are derived and compared in both the cases of water of finite and infinite depths. The usefulness of the expansion formulae is demonstrated by deriving the solution for surface gravity wave interaction with submerged articulated flexible plate in water of finite depth. Several numerical results on reflection and transmission coefficients related to submerged flexible plate are presented in order to understand the effect of submerged flexible structure on surface wave motion in different cases.

关键词： Submerged flexible structures Green’s function expansion formulae articulated submerged plate reflection and transmission coefficients

Hydroelastic Analysis of a Rectangular Plate Subjected to Slamming Loads

在线全文

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2017年第4期16卷 405-416页

作者： Shan Wang c.guedes soares centre for Marine Technology and Ocean Engineering(cENTEc) Instituto Superior TécnicoUniversidade de LisboaLisboa 1049-001Portugal

A hydroelastic analysis of a rectangular plate subjected to slamming loads is presented. An analytical model based on Wagner theory is used for calculations of transient slamming load on the ship plate. A thin isotropic plate theory is considered for determining the vibration of a rectangular plate excited by an external slamming force. The forced vibration of the plate is calculated by the modal expansion method. Analytical results of the transient response of a rectangular plate induced by slamming loads are compared with numerical calculations from finite element method. The theoretical slamming pressure based on Wagner model is applied on the finite element model of a plate. Good agreement is obtained between the analytical and numerical results for the structural deflection of a rectangular plate due to slamming pressure. The effects of plate dimension and wave profile on the structural vibration are discussed as well. The results show that a low impact velocity and a small wetted radial length of wave yield negligible effects of hydroelasticity.

关键词： slamming load hydroelastic analysis vibration of plates modal expansion method finite element method

Review of Ship Slamming Loads and Responses

在线全文

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2017年第4期16卷 427-445页

作者： Shan Wang c.guedes soares centre for Marine Technology and Ocean Engineering(cENTEc) Instituto Superior TécnicoUniversidade de LisboaLisboa 1049-001Portugal

The paper presents an overview of studies of slamming on ship structures. This work focuses on the hull slamming, which is one of the most important types of slamming problems to be considered in the ship design process and the assessment of the ship safety. There are three main research aspects related to the hull slamming phenomenon, a) where and how often a slamming event occurs, b) slamming load prediction and c) structural response due to slamming loads. The approaches used in each aspect are reviewed and commented, together with the presentation of some typical results. The methodology, which combines the seakeeping analysis and slamming load prediction, is discussed for the global analysis of the hull slamming of a ship in waves. Some physical phenomena during the slamming event are discussed also. Recommendations for the future research and developments are made.

关键词： review slamming probability ship slamming hydroelasticity

Fatigue Reliability Assessment of correlated Welded Web-frame Joints

在线全文

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2014年第1期13卷 23-31页

作者： W.Huang Y.Garbatov c.guedes soares centre for Marine Technology and Engineering (cENTEc) Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais 1049-001 Lisboa Portugal centre for Marine Technology and Engineering (cENTEc) Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais 1049-001 Lisboa Portuga

The objective of this work is to analyze the fatigue reliability of complex welded structures composed of multiple web-frame joints, accounting for correlation effects. A three-dimensional finite element model using the 20-node solid elements is generated. A linear elastic finite element analysis was performed, hotspot stresses in a web-frame joint were analyzed and fatigue damage was quantified employing the S-N approach. The statistical descriptors of the fatigue life of a non-correlated web-frame joint containing several critical hotspots were estimated. The fatigue reliability of a web-frame joint wasmodeled as a series system of correlated components using the Ditlevsen bounds. The fatigue reliability of the entire welded structure with multiple web-frame joints, modeled as a parallel system of non-correlated web-frame joints was also calculated.

关键词： fatigue reliability hotspot stress S-N approach finite element analysis web-frame joints

在线全文

学校读者我要写书评

暂无评论

海上液化天然气行业风险分析研究综述

哈尔滨工程大学学报（英文版） 2023年第4期22卷 693-715页

作者： Mohamed Abdelmalek c.guedes soares centre for Marine Technology and Ocean Engineering(cENTEc) Instituto Superior TécnicoUniversidade de Lisboa Portugal

This research presents a review and classification of the published work related to applied risk analysis and risk management in the maritime liquefied natural gas(LNG)sector from 2000 to *** papers are categorised under two primary *** first is the risk analysis theory context which represents the classification with respect to(w.r.t.)the used risk analysis method,the used risk analysis tool,and the objective of risk analysis,whereas the second is the presented case in the risk analysis context which represents the classification *** analysed LNG ship type,the analysed operation,and the inclusion level of human error in risk *** above process has revealed that the interest in this domain of research has increased significantly during the past *** addition,the use of dynamic risk analysis(DRA)tools,and the inclusion of human error in the risk analysis model have been observed significantly in the past five years,in particular,for modelling the risk of external LNG transfer *** is concluded that the inclusion of the effect of human and organisational factors(HOFs)in risk analysis,and the use of DRA methods for modelling the risk of the daily routine operations of the complex maritime LNG systems can improve the management of the operational risk of these systems.

关键词： Maritime LNG sector LNG hazards Risk analysis and management Human and organisational factors

海上自主水面船舶(MASS)路径跟踪控制系统综述

在线全文

学校读者我要写书评

暂无评论

哈尔滨工程大学学报（英文版） 2023年第2期22卷 153-171页

作者： Haitong Xu c.guedes soares centre for Marine Technology and Ocean Engineering(cENTEc) Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal

A review presents the state-of-the-art path-following control systems for maritime autonomous surface ships,where the special focus is placed on the guidance subsystem and control *** path following control system is one of the basic requirements for autonomous ships since it guarantees that the ship can track the predefined path with small crosstrack *** path following problem is firstly defined,and the cross-track error dynamics are derived from the kinematic equations of marine surface *** classical guidance laws are introduced,and the governing equations are also presented in this paper.A review of the guidance laws and controllers for the maritime autonomous surface ships has been carried out based on relevant journal and conference *** important properties and characteristics,such as control structure,guidance law,control method,stability,environmental disturbance and vessel dynamics,are defined for the comparative ***,the summary and a discussion on the most used technologies for the path following control of marine autonomous surface ships are presented and highlighted.

关键词： Maritime autonomous surface ship Path following Guidance law control method Stability