检索结果-内蒙古大学图书馆

Dynamic response modeling of sea-crossing bridge pier under the combined action of earthquakes and ocean waves using high-order time-domain boundary element method

引用

MARINE structureS 2025年 103卷

作者： Pan, Junzhi Ti, Zilong Wei, Kai Wang, Piguang Li, Yongle Southwest Jiaotong Univ State Key Lab Bridge Intelligent & Green Construct Chengdu 610031 Sichuan Peoples R China Beijing Univ Technol Inst Disaster Prevent Reduct & Protect Engn Beijing 100124 Peoples R China

A high-order time-domain boundary element method (TDBEM) for evaluating the combined impact of earthquakes and waves on sea-crossing bridge piers is presented, facilitating a comprehensive simulation of the interactions among seismic activity, wave forces, and structural responses. The proposed method is validated through numerical simulations from existing studies and benchmark model tests. An elliptical pier is used as a case study to analyze these combined effects. Results indicate that water depth significantly influences structural seismic responses due to changes in fundamental frequencies caused by added water mass. The influence of waves in the combined action is contingent upon the dominant seismic frequencies and the structural fundamental frequencies. When the structural fundamental frequency is far from typical ocean wave frequencies, fluid-structure interaction (FSI) effects amplify the peak response by 8 % to 25 %, depending on the ground motion's dominant frequency. When the structural fundamental frequency coincides with typical ocean wave frequency ranges, FSI effects exhibit an uneven influence on the structural response due to the inhomogeneity of wave-induced FSI effects. In such conditions, as the dominant frequency of ground motions increases, the suppression effect induced by wave FSI on the peak response may counterbalance or exceed the influence of earthquake-induced FSI effects.

关键词： Combined action of earthquakes and waves Boundary element method fluid-structure interaction Earthquake-induced hydrodynamic effect Wave-structure interaction

来源：评论

学校读者我要写书评

暂无评论

The relationship between regional mechanical properties and hemodynamic indices of the aortic arch: a preliminary study

引用

BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2025年第2期24卷 579-588页

作者： Zhao, Yawei Cao, Yifan Li, Fen Zhang, Chenjia Shi, Yike Song, Hui Chen, Lingfeng Chen, Weiyi Taiyuan Univ Technol Coll Biomed Engn Taiyuan 030024 Peoples R China Taiyuan Univ Technol Coll Mech & Vehicle Engn Taiyuan 030024 Peoples R China Taiyuan Univ Technol Inst Appl Mech Taiyuan 030024 Peoples R China

This study aimed to investigate the relationship between regional elastic modulus and corresponding hemodynamic indices of healthy aortic arch. Porcine aortic arches (n=18) were obtained from a local abattoir and divided into 24 regions along axial and circumferential directions. Regional elastic modulus was measured by indentation tests, and elastic fiber content was assessed using Elastica van Gieson (EVG) staining. Additionally, a porcine aortic model was reconstructed based on computed tomography angiography (CTA) images, and local hemodynamic indices were calculated by the two-way fluid-structure interaction (FSI) method. The elastic modulus and elastic fiber content were inclined to be lower on the outer curvature of the aortic arch, particularly showing significant differences at the distal end. A negative correlation was found between elastic modulus and time-averaged wall shear stress (TAWSS)(rs=-0.762,p=0.028\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$(r_{s}=-0.762, \textit{p}=0.028$$\end{document}) at the proximal end of the porcine aortic arch. There was a significant positive correlation between elastic modulus and oscillatory shear index (OSI)(rs=0.714,p=0.047)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$(r_{s}=0.714, \textit{p}=0.047)$$\end{document} at the middle of the aortic arch. The regional elastic modulus of healthy porcine aortic arch is associated with local TAWSS and OSI. The hemodynamic environment could be a contributing factor influencing the distribution of the mechanical properties on the arch.

关键词： Aortic mechanical properties fluid-structure interaction Indentation tests Hemodynamic indices

来源：评论

学校读者我要写书评

暂无评论

Active sensing of industrial fluid degradation via electro-mechanical impedance of a submerged piezoelectric wafer

引用

SMART MATERIALS AND structureS 2025年第1期34卷

作者： Lu, Runye Shen, Yanfeng Shanghai Jiao Tong Univ Univ Michigan Shanghai Jiao Tong Univ Joint Inst Shanghai 200240 Peoples R China

Industrial fluids, such as lubricants and cutting compounds, are ubiquitous in diverse mechanical transmission systems and manufacturing scenarios. Throughout the operational lifespan, these fluids are vulnerable to degradation and contamination, rendering change of mechanical properties and loss of performance, therefore causing detrimental effects on subordinate machineries and product quality. To address such a concern, this article proposes an electro-mechanical impedance spectroscopy for the real-time monitoring of industrial fluids via a structure-fluid interactive piezoelectric sensor. To unravel the intricacies of the interactive mechanism between industrial fluids and the piezoelectric sensory device, an analytical model was established, with the influence of the fluid processed as an additional inertial load and dissipative viscosity. Meanwhile, finite element analysis was performed to scrutinize the nuanced influence of the fluid with fluid-structural interaction boundary condition and spring-damper dissipative elements. Parametric studies were conducted to evaluate the impedance spectral features arising from the fluid properties alterations. A damage index based on the amplitude and frequency shift of the impedance spectra can readily serve as a robust quantifier of fluid degradation severity. Ultimately, experimental tests were performed to validate against the analytical and finite element models. The glycerol-water-mixed fluid was utilized to verify the sensor's sensitivity on density and viscosity alteration of the fluid. Two industrial fluids, gearbox lubricant and cutting fluid under various service periods, were employed to demonstrate the practical monitoring capability. This article culminates with summary, concluding remarks, and suggestions for future work.

关键词： electro-mechanical impedance fluid-structure interaction industrial fluid monitoring piezoelectric wafer active sensing

来源：评论

学校读者我要写书评

暂无评论

A semi-analytical model for nonlinear vibration analysis of clamped, submerged, and fluid-filled cylindrical shells

引用

JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 2025年第2期47卷 1-16页

作者： Montes, Roger O. P. da Silva, Frederico M. A. Pedroso, Lineu J. Fed Inst Goias Fed Inst Educ Sci & Technol Goias Rua FormosaQuadras 28-29Uruacu CampusLoteamento BR-76400000 Uruacu GO Brazil Univ Brasilia Fac Technol Dept Civil & Environm Engn Darcy Ribeiro Univ Campus BR-70910900 Brasilia DF Brazil Univ Fed Goias Sch Civil & Environm Engn Ave Univ1488Setor Univ BR-74605220 Goias GO Brazil

This work introduces a semi-analytical approach to examining the forced and nonlinear oscillations of a cylindrical shell clamped with clamped-free boundary conditions. The structural model considers the fluid-structure interaction provoked by an external and internal fluid. The effects of the free surface motion are also considered in the fluid-structure interaction. The Sanders-Koiter nonlinear theory is employed to characterize deformation fields and changes in curvature. Displacement fields are described through modal expansions obtained from Chebyshev polynomials. Using the Rayleigh-Ritz method, the set of nonlinear equilibrium equations are derived and subsequently solved to determine natural frequencies, vibration modes, and the forced response. The results of the derived semi-analytical model are compared with the numerical results, obtained through a finite element analysis, to check the convergence. The inclusion of external and internal fluid in dynamic analysis is crucial as it introduces additional mass and reduces natural frequency values, influencing the forced response of the investigated clamped-free cylindrical shell. This work also investigates the nonlinear vibrations induced by static uniform pressure or a time-dependent uniform harmonic pressure, evaluating the time responses and phase planes. The obtained forced response presents good agreement with the results came from finite element analysis, demonstrating the efficiency of the derived semi-analytical model to obtain the free and the forced nonlinear response of the proposed fluid-structure interaction problem.

关键词： Cylindrical shells fluid-structure interaction Free vibrations Numerical analysis Forced vibration

来源：评论

学校读者我要写书评

暂无评论

Dynamic responses of liquid-filled vessels impacted by a high-velocity projectile

引用

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 2025年 285卷

作者： Ren, Kerong Peng, Yong Miao, Jitian Li, Xiangyu Qing, Hua Wang, Wenwen Zheng, Yawen Xu, Wentao Chen, Rong Lu, Fangyun Natl Univ Def Technol Coll Sci Changsha 410008 Peoples R China AF Engn Univ Aviat Maintenance NCO Sch Xinyang 464001 Henan Peoples R China Zhengzhou Univ Sch Mech & Safety Engn Zhengzhou 450000 Peoples R China

Projectile impacts are a common safety problem for the fluid-filled structures. However, there is no universal theoretical approach to the quantitative characterization of this phenomenon, which restricts the associated hazard assessment. To address this issue, a theoretical model was proposed to describe the dynamic responses of liquid-filled vessels impacted by a high-velocity projectile, with a particular focus on the deformation of the vessel's rear plate. The model consists of three sub-models, i.e., the ballistic wave model, the fluid-structure interaction (FSI) model and the petal hole model. The proposed theoretical model accurately predicted the ballistic wave propagation and attenuation, as well as the interaction with the rear plate, which ultimately resulted in the formation of petal holes, in both ballistic impact experiments and finite element numerical simulations. Significant cavitation was observed at the interface between the rear plate and the fluid due to strong spatial nonlinearity of the ballistic wave, resulting in a shorter effective loading duration from the wave. The bending wave, which propagated from the center of the rear plate, caused a second acceleration of the rear plate with a duration of dozens of mu s, thereby contributing to energy conversion inside the rear plate. The initial kinetic energy Ek of the rear plate, with a maximum of approximately 3 kJ, and the projected area Sp of the petal hole with a maximum of approximately 180 cm2, were positively correlated with the impact velocity v0 of the projectile ranging from 1000 to 1600 m & sdot;s-1 and negatively correlated with the length L of the fluid ranging from 16 to 28 cm. This work offers new insights into the relationship between ballistic impact parameters and structural deformation.

关键词： Hydrodynamic ram fluid-structure interaction High-velocity impact Impact dynamics Liquid-filled vessel

来源：评论

学校读者我要写书评

暂无评论

Structural Feasibility of a Wind Turbine Blade Inspired by an Owl Airfoil

引用

ENERGIES 2025年第5期18卷

作者： Sesalim, Dean Naser, Jamal Swinburne Univ Technol Dept Mech & Prod Design Engn Hawthorn Vic 3122 Australia

Geometrical solutions for aerodynamic limitations comprise a major development towards improving the wind energy capture efficiency and aerodynamic performance of wind turbines. However, the implementation of some mechanisms such as considerably thin airfoils have been a hurdle due to the available manufacturing methods and cost effectiveness. Moreover, the analysis has been mostly focused on analyzing and optimizing the aerodynamic aspect of wind turbines, independently of the structural performance necessary to support the optimized aerodynamic performance. Therefore, this paper analyzes the fluid-structure interaction (FSI) of a wind turbine with a relatively thin airfoil section using computational fluid dynamics (CFD) and finite element analysis (FEA) to evaluate the total displacement as well as the stresses acting on the blade as the results of the aerodynamic pressure distribution. Using the structural design, geometrical scales, and material properties of baseline model, the structural performance reflected by the thin airfoil design is isolated. Not only did the thin airfoil reduce the volume of the material and, therefore, the weight of the modified blade, but it was also able to provide high rigidity, which is necessary to support better aerodynamic performance. This was found to be influenced by the structural shape of the turbine blade, resulting in a maximum total deformation of less than 5.9 x 10-7 m, which is very negligible in comparison to the scale of the turbine blade in this analysis.

关键词： wind turbine performance fluid-structure interaction wind turbine simulation

来源：评论

学校读者我要写书评

暂无评论

Vortex-induced vibration characteristic in two regions of double deck plate-truss composite girder and countermeasure study

引用

structureS 2025年 71卷

作者： Zeng, Ding Ma, Cunming Pei, Cheng Xu, Yangzhou Southwest Jiaotong Univ Sch Civil Engn Chengdu 610031 Peoples R China Key Lab Wind Engn Sichuan Prov Chengdu 610031 Peoples R China Civil Aviat Flight Univ China Airport Coll Guanghan 618307 Peoples R China Shijiazhuang Tiedao Univ State Key Lab Mech Behav & Syst Safety Traff Engn Shijiazhuang 050043 Peoples R China Sichuan Engn Res Ctr Smart Operat & Maintenance Ci Guanghan 618300 Peoples R China

This research investigates the mechanisms and aerodynamic countermeasures associated with the two vertical vortex-induced vibration (VIV) regions in a double deck plate-truss composite girder. Initially, large-scale wind tunnel tests were conducted on the original section of the girder. These tests revealed the existence of two vertical VIV regions at angles of attack (AoAs) of 0 degrees and + 3 degrees. Additionally, the computational fluid dynamics (CFD) method was employed to analyze the flow field and simulate the interaction between the flow and structure of the original section. The numerical analysis results suggest that the two VIV phenomena arise from different underlying mechanisms. The first vertical VIV is associated with vortex shedding at the upper chord bar, while the second is related to alternating vortex shedding in two rows downstream of the girder. Finally, based on CFD simulations, aerodynamic countermeasures for VIV were explored, and six different schemes were tested in sectional model wind tunnel experiments. The results demonstrate that the proposed inclined deflector effectively mitigates VIV in both regions of the double deck plate-truss composite girder.

关键词： VIV Plate-truss composite girder Wind tunnel test CFD fluid-structure interaction Countermeasure study

来源：评论

学校读者我要写书评

暂无评论

Reactive-transport regulation criteria for coking behavior in cellulose hydrolysis

引用

CHEMICAL ENGINEERING JOURNAL 2024年 499卷

作者： Wei, Haoyang Wei, Xiangqian Zhou, Xinyi Chen, Gehao Zhang, Xinghua Ma, Longlong Southeast Univ Sch Energy & Environm Key Lab Energy Thermal Convers & Proc Measurement Minist Educ Nanjing 210096 Jiangsu Peoples R China

Continuous-flow depolymerization technology offers a promising route for establishing the material foundation of a bio-based sustainable chemical industry. While dilute acid hydrolysis efficiently converts biomass into platform molecules, the challenge of uncontrollable humins coking remains a significant barrier to process optimization. In this study, we systematically elucidate the responsive mechanism of this coking phenomenon to reactive-transport processes in continuous hydrolysis preparation of levulinic acid (LA) from biomass using a novel 3D, mesoscopic reactive-transport model combined with the cross-linking structure of biomass and liquid-solid interface dynamic evolution. Results highlight the crucial roles of flow characteristics and hydrogen ion transport in coking inhibition during cellulose continuous hydrolysis. We show that, the complicated fluid-structure interaction of the cellulose-depolymerization-humins-precipitation process could be distinguished into three coking behavior features which are the dissolution stage, nucleation stage, and coking explosion stage. Sensitivity analysis of hydrogen ion concentration and particle stacking height demonstrate the dominant effect of hydrogen ion accessibility of cellulose on the overall hydrolysis performance. This work provides valuable insights into controlling coking behavior, providing the way for more efficient biomass platform preparation technologies.

关键词： Cellulose Lattice Boltzmann Humins coking fluid-structure interaction Levulinic acid

来源：评论

学校读者我要写书评

暂无评论

Geometric re-meshing strategies to simulate contactless rebounds of elastic solids in fluids

引用

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2024年 422卷

作者： Fara, J. Schwarzacher, S. Tema, K. Charles Univ Prague Fac Math & Phys Sokolovska 83 Prague 18675 Czech Republic Dept Math Box 480 S-75106 Uppsala Sweden

The paper deals with the rebound of an elastic solid off a rigid wall of a container filled with an incompressible Newtonian fluid. Our study focuses on a collision-free bounce, meaning a rebound without topological contact between the elastic solid and the wall. This has the advantage of omitting any artificial bouncing law. In order to capture the contact-free rebound for very small viscosities an adaptive numerical scheme is introduced. The here -introduced scheme is based on a Glowinski time scheme and a localized arbitrary Lagrangian-Eulerian map on finite elements in space. The absence of topological contact requires that very thin liquid channels are solved with sufficient accuracy. It is achieved via newly developed geometrically driven adaptive strategies. Using the numerical scheme, we present here a collection of numerical experiments. A rebound is simulated in the absence of topological contacts. Its physical relevance is demonstrated as, with decreasing viscosities, a free rebound in a vacuum is approached. Further, we compare the dynamics with a second numerical scheme;a here -introduced adaptive purely Eulerian level -set method. The scheme produced the same dynamics for large viscosities. However, as it requires a much higher computational cost, small viscosities cannot be reached by this method. The experiments allow for a better understanding of the effect of fluids on the dynamics of elastic objects. Several observations are discussed, such as the amount of elastic and/or kinetic energy loss or the precise connection between the fluid pressure and the rebound of the solid.

关键词： Contact Numerical simulation Finite element method fluid-structure interaction Rebound

来源：评论

学校读者我要写书评

暂无评论

The effect of dentinal fluid flow during loading in various directions-Simulation of fluid-structure interaction

引用

ARCHIVES OF ORAL BIOLOGY 2013年第6期58卷 575-582页

作者： Su, Kuo-Chih Chang, Chih-Han Chuang, Shu-Fen Ng, Eddie Yin-Kwee Natl Cheng Kung Univ Coll Engn Dept Biomed Engn Tainan 701 Taiwan Natl Cheng Kung Univ Coll Med & Hosp Inst Oral Med Tainan 701 Taiwan Natl Cheng Kung Univ Coll Med & Hosp Dept Stomatol Tainan 701 Taiwan Nanyang Technol Univ Coll Engn Sch Mech & Aerosp Engn Singapore 639798 Singapore

Objectives: This study uses a fluid-structure interaction (FSI) simulation to evaluate the fluid flow in a dental intrapulpal chamber induced by the deformation of the tooth structure during loading in various directions. Methods: The FSI is used for the biomechanics simulation of dental intrapulpal responses with the force loading gradually increasing from 0 to 100 N at 0 degrees, 30 degrees, 45 degrees, 60 degrees, and 90 degrees on the tooth surface in 1 s, respectively. The effect of stress or deformation on tooth and fluid flow changes in the pulp chamber are evaluated. Results: A horizontal loading force on a tooth may induce tooth structure deformation, which increases fluid flow velocity in the coronal pulp. Thus, horizontal loading on a tooth may easily induce tooth pain. Conclusion: This study suggests that experiments to investigate the relationship between loading in various directions and dental pain should avoid measuring the bulk pulpal fluid flow from radicular pulp, but rather should measure the dentinal fluid flow in the dentinal tubules or coronal pulp. The FSI analysis used here could provide a powerful tool for investigating problems with coupled solid and fluid structures in dental biomechanics. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： Dentinal fluid flow Hydrodynamic theory Pulpal nerve stimulation Dental biomechanics fluid-structure interaction

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：