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A numerical study of passenger side airbag deployment based on arbitrary Lagrangian-eulerian method

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Science China(Technological Sciences) 2015年第3期58卷 397-404页

作者： WANG XiJun ZONG Zhi ZHAO Yong ZOU Li School of naval architecture Engineering State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Transportation Equipment and Ocean Engineering College Dalian Maritime University

The passenger side airbags(PAB)are usually larger than the driver ***,the inflator of PAB is more powerful with high mass *** this paper,an Arbitrary Lagrangian-Eulerian(ALE)method based computational method is developed to simulate the deployment of a *** tank test is used to test the property of the *** comparison of numerical and experimental results,the ALE method is *** on a failed airbag test,a smaller sub-airbag is placed inside PAB to disperse the gas flow to directions which are less *** applying dynamic relaxation,the initial mesh corresponding to the experimental terms is *** results indicate that the interior pressure and impact force coincide with the test data,and the method in this paper is capable of capturing airbag deploying process of the PAB module accurately.

关键词： arbitrary Lagrangian-eulerian(ALE) method passenger side airbags(PAB) airbag simulation sub-airbag tank test

Radiation and diffraction analysis of a cylindrical body with a moon pool

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Journal of Hydrodynamics 2013年第2期25卷 196-204页

作者：周华伟张洪生 State Key Laboratory of Ocean Engineering College of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Ocean Environmental and Engineering College Shanghai Maritime University

An analytical solution is presented for the radiation and the diffraction of a cylindrical body with a moon pool floating on the surface of water with a finite depth. The expressions for the potentials are obtained by the method of separation of variables, and the unknown coefficients are determined by the boundary conditions and the matching requirements on the interface. The effects of the moon pool on the hydrodynamic characteristics of the body are investigated. Some peaks are observed on the curves of the added mass and damping coefficients, corresponding to the resonant frequencies of the moon pool. The internal free surface moves like a piston at a certain low resonant frequency.

关键词： radiation and diffraction cylindrical body moon pool variable separation method resonant frequencies

A study on nonlinear steady-state waves at resonance in water of finite depth by the amplitude-based homotopy analysis method

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Journal of Hydrodynamics 2020年第5期32卷 888-900页

作者： Da-li Xu Zeng Liu College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China School of naval architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China

Nonlinear steady-state waves are obtained by the amplitude-based homotopy analysis method(AHAM)when resonances among surface gravity waves are considered in water of finite ***,newly proposed in this paper within the context of homotopy analysis method(HAM)and well validated in various ways,is able to deal with nonlinear wave *** waves with small propagation angles,it is confirmed that more components share the wave energy if the wave field has a greater ***,in waves with larger propagation angles,it is newly found that wave energy may also concentrate in some specific *** such wave fields,off-resonance detuning is also *** and symmetrical properties are discovered in some wave *** results may provide a deeper understanding on nonlinear wave interactions at resonance in water of finite depth.

关键词： Nonlinear wave wave resonance steady state homotopy analysis method(HAM)

An improved lattice Boltzmann model for high gas and liquid density ratio in composite grids

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Theoretical & Applied Mechanics Letters 2018年第5期8卷 326-333,362页

作者： Shaojun Zhang Wanqing Wu Qinggong Zheng Marine Engineering College Dalian Maritime University College of naval architecture and Marine Engineering Shandong Jiaotong University

Lattice Boltzmann method is one of the widely used in multiphase fluid ***,the two main disadvantages of this method are the instability of numerical calculations due to the large density ratio of two phases and impossibility of the temperature distribution to be fed back into the velocity distribution function when the temperature is *** on the combination prescribed by Inamuro,the large density ratio two-phase flow model and thermal model makes the density ratio of the model simulation to be increased to 2778:1 by optimizing the interface distribution function of two-phase which improves the accuracy of differential *** phase transition term is added as source term into the distribution function controlling two phase order parameters to describe the temperature effect on the gas-liquid phase *** latent heat generated from the phase change is also added as a source term into the temperature distribution function which simulates the movement of the flow under the common coupling of density,velocity,pressure and *** density and the temperature distribution of single bubble are *** of the simulation results with experimental results indicates a good agreement pointing out the effectiveness of the improved model.

关键词： Lattice Boltzmann model Density ratio Composite grids Bubble motion Temperature effect

Prediction of regular wave loads on a fixed offshore oscillating water column-wave energy converter using CFD

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Journal of Ocean Engineering and Science 2016年第4期1卷 268-283页

作者： Ahmed Elhanafi National Centre for maritime Engineering and Hydrodynamics Australian Maritime CollegeUniversity of TasmaniaLauncestonTasmania 7250Australia Department of naval architecture and Marine Engineering Alexandria UniversityAlexandriaEgypt

In this paper,hydrodynamic wave loads on an offshore stationary-floating oscillating water column(OWC)are investigated via a 2D and 3D computational fluid dynamics(CFD)modeling based on the RANS equations and the VOF surface capturing *** CFD model is validated against previous experiments for nonlinear regular wave interactions with a surface-piercing stationary *** the validation stage,the numerical model is modified to consider the pneumatic damping effect,and an extensive campaign of numerical tests is carried out to study the wave-OWC interactions for different wave periods,wave heights and pneumatic damping *** is found that the horizontal wave force is usually larger than the vertical ***,there a direct relationship between the pneumatic and hydrodynamic vertical forces with a maximum vertical force almost at the device natural frequency,whereas the pneumatic damping has a little effect on the horizontal ***,simulating the turbine damping with an orifice plate induces higher vertical loads than utilizing a slot ***,3D modeling significantly escalates and declines the predicted hydrodynamic vertical and horizontal wave loads,respectively.

关键词： Offshore oscillating water column OWC Hydrodynamic wave loads Numerical wave tank CFD 3D effects

A one-dimensional polynomial chaos method in CFD–Based uncertainty quantification for ship hydrodynamic performance

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Journal of Hydrodynamics 2013年第5期25卷 655-662页

作者：贺伟 DIEZ Matteo CAMPANA Emilio Fortunato STERN Frederick 邹早建 School of naval architecture Ocean and Civil Engineering Shanghai Jiao Tong University IIHR-Hydroscience and Engineering The University of Iowa IIHR-Hydroscience and Engineering The University of Iowa CNR-INSEAN National Research Council-Maritime Research Centre CNR-INSEAN National Research CouncilMaritime Research Centre School of naval architecture Ocean and Civil Engineering and State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University

A one-dimensional non-intrusive Polynomial Chaos （PC） method is applied in Uncertainty Quantification （UQ） studies for CFD-based ship performances simulations. The uncertainty properties of Expected Value （EV） and Standard Deviation （SD） are evaluated by solving the PC coefficients from a linear system of algebraic equations. The one-dimensional PC with the Legendre polynomials is applied to：（1） stochastic input domain and （2） Cumulative Distribution Function （CDF） image domain, allowing for more flexibility. The PC method is validated with the Monte-Carlo benchmark results in several high-fidelity, CFD-based, ship UQ problems, evaluating the geometrical, operational and environmental uncertainties for the Delft Catamaran 372. Convergence is studied versus PC order P for both EV and SD, showing that high order PC is not necessary for present applications. Comparison is carried out for PC with/without the least square minimization when solving the PC coefficients. The least square minimization, using larger number of CFD samples, is recommended for current test cases. The study shows the potentials of PC method in Robust Design Optimization （RDO） and Reliability-Based Design Optimization （RBDO） of ship hydrodynamic performances.

关键词： Uncertainty Quantification (UQ) Polynomial Chaos (PC) method Legendre polynomials ship design

Fatigue Characteristic Analysis of Deepwater Steel Catenary Risers at the Touchdown Point

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China Ocean Engineering 2010年第2期24卷 291-304页

作者：傅俊杰杨和振 State Key Laboratory of Ocean Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong University Ningbo maritime Safety Administration of China

This paper presents fatigue characteristic analysis of a deepwater steel catenary riser （SCR） under ambient excitations. The SCR involves complex nonlinear dynamic behaviors, especially at the touchdown point （TDP） where the riser first touches the seafloor. Owing to the significant interaction with soil, the touchdown zone is difficnlt to be modeled. Based on Lumped-Mass method and P-y curve, nonlinear springs are used to simulate the SCR-seabed coupled interaction. In case studies, an SCR＇s dynamic features have been obtained by transient analysis and the structure fatigue assessment has been carried out by S-N approach. The comparative analysis shows that the TDP is the key location where soil-riser interaction rises steeply and minimum fatigue life occurs. Parameters such as ocean environment loads, vessel motions, riser material and geometric parameters are discussed. The results indicate that the vessel motion is the principal factor for the structure fatigue life distribution.

关键词： steel catenary riser touchdawn point fatigue analysis dynamic response nonlinear spring

A review of friction stir joining of SiCp/Al composites

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Chinese Journal of Aeronautics 2020年第3期33卷 792-804页

作者： Lisheng ZUO Xianrui ZHAO Zeyang LI Dunwen ZUO Hongfeng WANG College Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of naval architecture&Ocean Engineering Jiangsu Maritime InstituteNanjing 211170China

SiCp/Al composites have excellent comprehensive properties and have been widely used in aerospace,automotive industry and other *** to the huge difference in performance between SiC particles and matrix alloys,traditional fusion welding methods are difficult to meet the join requirements of SiCp/Al *** stir joining(friction stir welding),as a solid phase joining process,has been proved to be a new technology with fine prospect in joining SiCp/Al composites compared with fusion welding *** some progress has been made in recent years,there are still full of *** this paper,the research status of friction stir joining of SiCp/Al composites in recent years is expatiated,including the weldability of SiCp/Al composites,the macrostructure and the microstructure of joints,mechanical properties of joints,and tool wear and ***,the existing challenges of friction stir joining of SiCp/Al composites are summarized and the future development directions are prospected.

关键词： Friction stir joining Mechanical properties Microstructure SiCp/Al composites Tool wear

Extreme Wave Simulation with Iterative Adaptive Approach in Numerical Wave Flume

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China Ocean Engineering 2021年第1期35卷 61-71页

作者： LIU Dian-yong naval architecture and Ocean Engineering College Dalian Maritime UniversityDalian 116026China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116023China

Extreme wave is highly nonlinear and may occur due to diverse reasons *** simulated results of extreme wave based on wave focusing,which were generated using high order spectrum method,are *** influences of the steepness,frequency bandwidth as well as frequency spectrum on focusing position shift were examined,showing that they can affect the wave focusing ***,controlled accurate generation of extreme wave at a predefined position in wave flume is a difficult but important *** this paper,an iterative adaptive approach is applied using linear dispersion theory to optimize the control signal of the *** performance of the proposed approach is numerically investigated for a wide variety of *** results demonstrate that this approach can reproduce accurate wave focusing effectively.

关键词： extreme wave wave focusing numerical wave flume iterative adaptive approach