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Finding buckling points for nonlinear structures by dynamic relaxation scheme

Mohammad REZAIEE-PAJAND, Hossein ESTIRI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1, Pages 23-61 doi: 10.1007/s11709-019-0549-z

Abstract: Dynamic Relaxation Method (DRM) is an explicit approach for solving the simultaneous systems of equationstactic, the fictitious mass and damping are added to the static governing equations, and an artificial dynamicMixing the dynamic relaxation scheme with external work technique has not been formulated so far.In fact, the suggested load factor depends only on the Dynamic Relaxation (DR) fictitious parameters.It is shown that author’s technique is quicker than the other dynamic relaxation strategies.

Keywords： load factor external work dynamic relaxation static equilibrium path large displacement

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Nonlinear analysis of cable structures using the dynamic relaxation method

Mohammad REZAIEE-PAJAND, Mohammad MOHAMMADI-KHATAMI

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1, Pages 253-274 doi: 10.1007/s11709-020-0639-y

Abstract: The dynamic relaxation method (DRM) is an explicit procedure for analyzing these types of structures.

Keywords： nonlinear analysis cable structure stiffness matrix dynamic relaxation method

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A fast and accurate dynamic relaxation scheme

Mohammad REZAIEE-PAJAND, Mohammad MOHAMMADI-KHATAMI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1, Pages 176-189 doi: 10.1007/s11709-018-0486-2

Abstract: Dynamic relaxation method (DRM) is one of the suitable numerical procedures for nonlinear structuralAdding the fictitious inertia and damping forces to the static equation, and turning it to the dynamicBased on this formulation, a new time step is found for the viscous dynamic relaxation.

Keywords： viscous dynamic relaxation time step displacement error geometric nonlinear analysis

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Deformation control criterion of shield tunnel under lateral relaxation of soft soil

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5, Pages 780-795 doi: 10.1007/s11709-023-0944-3

Abstract: Metro shield tunnels under the lateral relaxation of soil (LRS) are susceptible to significant lateralFor a shield tunnel with a diameter of approximately 6 m and under the lateral relaxation of sandy soil

Keywords： shield tunnel lateral relaxation of soil deformation control criterion of segment structure model

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The stress relaxation of cement clinkers under high temperature

Xiufang WANG,Yiwang BAO,Xiaogen LIU,Yan QIU

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4, Pages 413-417 doi: 10.1007/s11465-015-0357-7

Abstract: This research provides a theoretical proof for the mechanism of the stress relaxation of cement clinkersCompression stress relaxation under various high temperatures is discussed using a specially developedThe cell shows that stress relaxation dramatically increases and that the remaining stress rapidly decreases

Keywords： stress relaxation high temperature cement clinker compression elastic modulus

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Hypoplastic constitutive modeling of wetting deformation of weathered rockfill materials

Erich BAUER, Zhongzhi FU, Sihong LIU,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 1, Pages 78-91 doi: 10.1007/s11709-010-0011-8

Abstract: The wetting deformation of weathered rockfill materials has been attracting growing attention from both engineers and scientists. The importance of realistic predictions of wetting deformations for high earth and rockfill dams is a strong motivation to establish a suitable constitutive model. Recently, the hypoplastic constitutive model by Gudehus and Bauer was extended by introducing solid hardness depending on the state of weathering. The extended model takes into account the influence of the current density, the effective stress state, the rate of deformation, and the time dependent process of degradation of the solid hardness. In the present paper, the performance of this model is evaluated by comparing numerical simulations with experiments obtained from a water sensitive rockfill material. In particular, triaxial compression paths and creep deformation under deviatoric stress states are considered. Finally, the constitutive model proposed is used to study the influence of a degradation of the solid hardness on the long term behavior of a hypothetical fill dam.

Keywords： rockfill dams weathered granular materials hypoplasticity solid hardness creep stress relaxation

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Semidefinite relaxation aided noncoherent detection in two-way relay transmission Regular Papers-Research Articles

Chan-fei WANG, Ji-ai HE, Wei-fang WANG, Ya-mei XU

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 9, Pages 1259-1265 doi: 10.1631/FITEE.1800096

Abstract: Furthermore, GLRT-MSDD is reformulated and a semidefinite relaxation aided MSDD (SDR-MSDD) is proposed

Keywords： Multiple-symbol differential detection Generalized likelihood ratio test Semidefinite relaxation Two-way

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Numerical analysis of nonlinear dynamic behavior of earth dams

Babak EBRAHIMIAN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1, Pages 24-40 doi: 10.1007/s11709-010-0082-6

Abstract: A numerical study is conducted to investigate the dynamic behavior of earth dams.The numerical investigation employs a fully nonlinear dynamic finite difference analysis incorporatingcharacteristics, soil behavior, strength of the shell materials and dam reservoir condition on the dynamic

Keywords： earth dam numerical nonlinear response dynamic analysis earthquake dam height

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A survey of photon mapping state-of-the-art research and future challenges

Chun-meng KANG,Lu WAN,Yan-ning XU,Xiang-xu MENG

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 3, Pages 185-199 doi: 10.1631/FITEE.1500251

Abstract: reviews recent work and classifies it into a set of categories including radiance estimation, photon relaxation

Keywords： Global illumination Photon mapping Radiance estimation Photon relaxation Progressive photon mapping

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Construction of interfacial dynamic bonds for high performance lignin/polymer biocomposites

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10, Pages 1372-1388 doi: 10.1007/s11705-023-2302-3

Abstract: Recently, we proposed the strategy of in situ construction of interfacial dynamic bonds in ligninBy taking advantage of the abundant oxygen-containing polar groups of lignin, we inserted dynamic bondinggroup toward building high-performance lignin/polymer biocomposites through the design of interfacial dynamicbonds (hydrogen bonds, coordination bonds, and dynamic covalent bonds) between lignin and different

Keywords： lignin polymer interfacial dynamic bonds

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Molecular size characterization of heavy oil fractions in vacuum and solution by molecular dynamic simulation

Wenpo REN, Honggang CHEN, Chaohe YANG, Honghong SHAN,

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 3, Pages 250-256 doi: 10.1007/s11705-009-0281-7

Abstract: conformations of polycyclic aromatic and heavy resin in vacuum and toluene solution were obtained by molecular dynamic

Keywords： dynamic simulation molecular dynamic behavior molecule Adsorption Chromatography

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Bulk Glassy Alloys: Historical Development and Current Research Review

Akihisa Inoue

Engineering 2015, Volume 1, Issue 2, Pages 185-191 doi: 10.15302/J-ENG-2015038

Abstract:

This paper reviews the development of current research in bulk glassy alloys by focusing on the trigger point for the synthesis of the first bulk glassy alloys by the conventional mold casting method. This review covers the background, discovery, characteristics, and applications of bulk glassy alloys, as well as recent topics regarding them. Applications of bulk glassy alloys have been expanding, particularly for Fe-based bulk glassy alloys, due to their unique properties, high glass-forming ability, and low cost. In the near future, the engineering importance of bulk glassy alloys is expected to increase steadily, and continuous interest in these novel metallic materials for basic science research is anticipated.

Keywords： bulk glassy alloys mold casting metallic materials structural relaxation

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Dynamic Setting Automatic Control System for Flatness and Gauge

Zhang Jinzhi,Duan Chunhua

Strategic Study of CAE 2000, Volume 2, Issue 6, Pages 67-72

Abstract: characteristics is that shape and gauge close-circuit control is achieved by means of static load distribution, dynamicload distribution and dynamic setting Automatic Gauge Control (AGC), and Bellman dynamic programming

Keywords： dynamic load distribution shape optimal schedule dynamic programming dynamic setting

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Modelling of dynamic contact length in rail grinding process

Shaodan ZHI,Jianyong LI,A. M. ZAREMBSKI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 3, Pages 242-248 doi: 10.1007/s11465-014-0305-y

Abstract:

Rails endure frequent dynamic loads from the passing trains for supporting trains and guiding wheelsAnd the calculating models are improved considering the grinding car’s dynamic behaviors during

Keywords： rail grinding contact length dynamic model Hamiltonian system grinding stone rail grinding car

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A job-insertion heuristic for minimizing the mean flowtime in dynamic flowshops

Guang GUO, Bo WU, Shuzi YANG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2, Pages 197-202 doi: 10.1007/s11465-011-0211-5

Abstract:

A new adaptive job-insertion based heuristic is presented to minimize the mean flowtime in a dynamicdispatching rule, which is currently one of the most effective methods for minimizing the mean flowtime in dynamic

Keywords： scheduling dynamic flowshops flowtime heuristic mean flowtime