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Computational fluid dynamics simulation of aerosol transport and deposition

Yingjie TANG, Bing GUO

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 3, Pages 362-377 doi: 10.1007/s11783-011-0365-8

Abstract: In this article computational fluid dynamics (CFD) simulation of aerosol transport and deposition, i.e

Keywords： computational fluid dynamics (CFD) aerosol transport deposition

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Recent developments in passive interconnected vehicle suspension

Wade A. SMITH, Nong ZHANG,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 1, Pages 1-18 doi: 10.1007/s11465-009-0092-z

Abstract: A finite-element-method-based approddach for modelling the transient dynamics of an HIS vehicle is also

Keywords： interconnected suspensions rollover prevention vehicle dynamics ride comfort multibody system dynamics hydraulic system dynamics

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Nonlinear dynamics of a wind turbine tower

A. GESUALDO, A. IANNUZZO, F. PENTA, M. MONACO

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3, Pages 342-350 doi: 10.1007/s11465-019-0524-3

Abstract: Nonlinear dynamics is the most reliable among such methods.

Keywords： nonlinear dynamics plastic shear failure modal approximation time history

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Effect of ligand chain length on hydrophobic charge induction chromatography revealed by molecular dynamics

Lin ZHANG, Yan SUN

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 4, Pages 456-463 doi: 10.1007/s11705-013-1357-y

Abstract: desorption, and conformational transition of the proteins with CL2 and CL4 were examined using molecular dynamics

Keywords： adsorption desorption irreversibility protein conformational transition molecular dynamics simulation

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Applying system dynamics to strategic decision making in construction

SangHyun LEE

Frontiers of Engineering Management 2017, Volume 4, Issue 1, Pages 35-40 doi: 10.15302/J-FEM-2017002

Abstract: The author discusses the application of System Dynamics to high-level strategic simulation in constructionIn particular, System Dynamics’ strength on representing feedback processes, aggregation, soft variablesFrom this exercise, it is concluded that System Dynamics offers a great potential for strategic simulationFurther, the author proposes a comprehensive simulation framework that integrates System Dynamics and

Keywords： strategic project management construction management system dynamics feedback process hybrid simulation

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Model reduction of contact dynamics simulation using a modified Lyapunov balancing method

Jianxun LIANG, Ou MA, Caishan LIU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 4, Pages 383-391 doi: 10.1007/s11465-011-0244-9

Abstract:

Finite element models are often used to simulate impact and contact dynamics responses of multibodyefficiency of finite element based simulations, these techniques cannot be readily applied to contact dynamicssimulations due to the high nonlinearity of the contact dynamics models.This paper presents a model reduction approach for finite-element based multibody contact dynamics simulation

Keywords： contact dynamics dynamic simulation model reduction finite element method

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Nonlinear dynamics and analysis of a four-bar linkage with clearance

Yuanguang TANG, Zongyu CHANG, Xiaogang DONG, Yafei HU, Zhenjiang YU

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2, Pages 160-168 doi: 10.1007/s11465-013-0258-6

Abstract:

In this paper, nonlinear dynamic behavior of a four-bar linkage considering clearance is studied. The dynamic model of the linkage with a clearance between coupler and rocker is developed firstly. Then the dynamic equations of this mechanism are solved by a numerical method. According to the calculated response, compliance, force and trajectory of pin in joint bearing are obtained. Effects of clearance magnitude and the relationship between a mechanism with clearance and without clearance are studied. By using Poincare Map, it is proved that strange attractors or chaos exist in the dynamic response. In addition, phenomena of chaos, periodic response and subharmonic response also can be found in the special condition. Bifurcation diagram is used to suggest that bifurcation and fractal phenomena exist in the dynamic response of this mechanism.

Keywords： four-bar linkage chaos bifurcation strange attractors dynamics

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Water film coated composite liquid metal marble and its fluidic impact dynamics phenomenon

Yujie DING,Jing LIU

Frontiers in Energy 2016, Volume 10, Issue 1, Pages 29-36 doi: 10.1007/s11708-015-0388-0

Abstract: composite liquid metal marble made of metal droplet coated with water film was proposed and its impact dynamics

Keywords： liquid metal marble metallic droplet composite fluid impact dynamics multiphase fluid mechanics

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understanding of interfacial processing mechanism of silicon in water environment: A ReaxFF molecular dynamics

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 3, Pages 570-579 doi: 10.1007/s11465-021-0642-6

Abstract: The interfacial wear between silicon and amorphous silica in water environment is critical in numerous applications. However, the understanding regarding the micro dynamic process is still unclear due to the limitations of apparatus. Herein, reactive force field simulations are utilized to study the interfacial process between silicon and amorphous silica in water environment, exploring the removal and damage mechanism caused by pressure, velocity, and humidity. Moreover, the reasons for high removal rate under high pressure and high velocity are elucidated from an atomic perspective. Simulation results show that the substrate is highly passivated under high humidity, and the passivation layer could alleviate the contact between the abrasive and the substrate, thus reducing the damage and wear. In addition to more Si-O-Si bridge bonds formed between the abrasive and the substrate, new removal pathways such as multibridge bonds and chain removal appear under high pressure, which cause higher removal rate and severer damage. At a higher velocity, the abrasive can induce extended tribochemical reactions and form more interfacial Si-O-Si bridge bonds, hence increasing removal rate. These results reveal the internal cause of the discrepancy in damage and removal rate under different conditions from an atomic level.

Keywords： silicon ReaxFF molecular dynamics friction damage

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styrene-butadiene-styrene copolymer on the aging resistance of asphalt: An atomistic understanding from reactive molecular dynamics

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5, Pages 1261-1276 doi: 10.1007/s11709-021-0761-5

Abstract: characteristics of base asphalt and SBS-modified asphalt by reaction force field (ReaxFF) and classical molecular dynamics

Keywords： SBS asphalt oxidative aging asphalt hardening ReaxFF molecular dynamics

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Molecular dynamics study of water diffusion in an amphiphilic block copolymer with large difference in

Yang Zhou, Phillip Choi

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3, Pages 440-447 doi: 10.1007/s11705-017-1626-2

Abstract: Isothermal-isobaric molecular dynamics simulation was used to study the diffusion mechanism of water

Keywords： molecular dynamics simulation amphiphilic block copolymer free volume water diffusivity fujita model

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Model reduction techniques for dynamics analysis of ultra-precision linear stage

Xuedong CHEN, Zhixin LI

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1, Pages 64-70 doi: 10.1007/s11465-009-0009-x

Abstract: The dynamics behavior is studied.from the eigenvalue analysis shows that the components, except the translator, can represent system dynamicsanalysis proves the validity of the reduction approach, which can be generalized to the development and dynamics

Keywords： dynamics analysis air-bearing linear stage reduction

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Molecular dynamics investigation of mechanical properties of single-layer phagraphene

Ali Hossein Nezhad SHIRAZI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2, Pages 495-503 doi: 10.1007/s11709-018-0492-4

Abstract: the defect-free form, but also with the critical defect of line cracks, using the classical molecular dynamics

Keywords： phaqraphene mechanical properties crack propaqation molecular dynamics thermal effects

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Mechanical responses of pristine and defective hexagonal boron-nitride nanosheets: A molecular dynamics

Mohammad SALAVATI, Arvin MOJAHEDIN, Ali Hossein Nezhad SHIRAZI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3, Pages 623-631 doi: 10.1007/s11709-020-0616-5

Abstract: In this work we conducted classical molecular dynamics (MD) simulation to investigate the mechanical

Keywords： hexagonal boron-nitride mechanical properties crack notch point defects molecular dynamics

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Stability and dynamics of rotor system with 45° slant crack on shaft

Yanli LIN, Xiaohui SI, Fulei CHU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2, Pages 203-213 doi: 10.1007/s11465-011-0131-4

Abstract:

Crack on a shaft is one of the common damages in a rotor system. In this paper, transverse vibrations are calculated to compare the influences of transverse crack and slant crack on the rotor system. Results show that the vibration amplitude of the rotor system with a 45° slant crack on the shaft is larger than that with a transverse crack when the two types of crack have the same depth and the rotor system runs in the same condition. Stability and dynamic characteristics of the rotor system with a 45° slant crack on the shaft under torsional excitation are analyzed by considering opening and closing of the crack. It is shown that the instability of the transverse vibration of the rotor system increases with increasing difference between the bending stiffness in two main directions, and the vibration is stable when the two bending stiffness are identical. The spectrum analysis of the steady-state response reveals that the gravity and the eccentricity produce different frequency components, and when the two bending stiffness are identical, the multiple frequency components of the torsional excitation disappear. Further investigation shows that the vibration amplitudes in combined frequencies increase rapidly in transversal, torsional, and axial vibration with increasing slant crack depth. The results are helpful for the understanding the dynamic behavior of a rotor system with a slant crack on a shaft and can be used for the detection of the slant crack on a shaft.

Keywords： rotor dynamics slant crack stability torsional excitation open and close