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| 1 | Optimization of high-speed railway pantographs for improving pantograph-catenary contact显示文摘A crucial system for the operation of high-speed trains is the pantograph catenary interface as it is the sole responsible to deliver electrical power to the train. Being the catenary a stationary system with a long lifespan it is also less likely to be redesigned and upgraded than the pantographs that fit the train vehicles. This letter proposes an optimization procedure for the improvement of the contact quality between the pantograph and the catenary solely based on the redesign of the pantograph head suspension characteristics. A pantograph model is defined and validated against experimental dynamic characteristics of existing pantographs. An optimization strategy based on the use of a global optimization method, to find the vicinity of the optimal solution, followed by the use of a deterministic optimization algorithm, to fine tune the optimal solution, is applied here. The spring stiffness, damping characteristics and bow mass are the design variables used for the pantograph optimization. The objective of the optimal problem is the minimization of the standard deviation of the contact force history, which is the most important quantity to define the contact quality. The pantograph head suspension characteristics are allowed to vary within technological realistic limits. It is found that current high-speed railway pantographs have a limited potential for mechanical improvements, not exceeding 10%-15% on the decrease of the standard deviation of the contact force. | Jorge Ambrósio Joo Pombo Manuel Pereira | 2013 | Theoretical & Applied Mechanics Letters2013，3，1： | 15 |
| 2 | Elastic properties of chiral,anti-chiral,and hierarchical honeycombs:A simple energy-based approach显示文摘The effects of two geometric refinement strategies widespread in natural structures, chirality and self-similar hierarchy, on the in-plane elastic response of two-dimensional honeycombs were studied systematically. Simple closed-form expressions were derived for the elastic moduli of several chiral, antichiral, and hierarchical honeycombs with hexagon and square based networks. Finite element analysis was employed to validate the analytical estimates of the elastic moduli. The results were also compared with the numerical and experimental data available in the literature. We found that introducing a hierarchical refinement increases the Young's modulus of hexagon based honeycombs while decreases their shear modulus. For square based honeycombs, hierarchy increases the shear modulus while decreasing their Young's modulus. Introducing chirality was shown to always decrease the Young's modulus and Poisson's ratio of the structure. However, chirality remains the only route to auxeticity. In particular, we found that anti-tetra-chiral structures were capable of simultaneously exhibiting anisotropy, auxeticity,and remarkably low shear modulus as the magnitude of the chirality of the unit cell increases. | Davood Mousanezhad Babak Haghpanah Ranajay Ghosh Abdel Magid Hamouda Harold Nayeb-Hashemi Ashkan Vaziri | 2016 | Theoretical & Applied Mechanics Letters2016，6，2： | 11 |
| 3 | Physics-informed deep learning for incompressible laminar flows显示文摘Physics-informed deep learning has drawn tremendous interest in recent years to solve computational physics problems,whose basic concept is to embed physical laws to constrain/inform neural networks,with the need of less data for training a reliable model.This can be achieved by incorporating the residual of physics equations into the loss function.Through minimizing the loss function,the network could approximate the solution.In this paper,we propose a mixed-variable scheme of physics-informed neural network(PINN)for fluid dynamics and apply it to simulate steady and transient laminar flows at low Reynolds numbers.A parametric study indicates that the mixed-variable scheme can improve the PINN trainability and the solution accuracy.The predicted velocity and pressure fields by the proposed PINN approach are also compared with the reference numerical solutions.Simulation results demonstrate great potential of the proposed PINN for fluid flow simulation with a high accuracy. | Chengping Rao Hao Sun Yang Liu | 2020 | Theoretical & Applied Mechanics Letters2020，10，3： | 11 |
| 4 | Ride comfort evaluation for road vehicle based on rigid-flexible coupling multibody dynamics显示文摘In the present research two different whole vehicle multibody models are established respectively, including rigid and rigid-flexible coupling multibody vehicle models. The former is all composed by rigid bodies while in the later model, the flexible rear suspension is built based on the finite element method (FEM) and mode superposition method, in which the deformations of the components are considered. The ride simulations with different speeds are carried out on a 3D digitalized road, and the weighted root mean square (RMS) of accelerations on the seat surface, backrest and at the feet are calculated. The comparison between the responses of the rigid and rigid-flexible coupling multibody models shows that the flexibility of the vehicle parts significantly affects the accelerations at each position, and it is necessary to take the flexibility effects intoaccount for the assessment of ride comfort. | Guangqiang Wu Guodong Fan Jianbo Guo | 2013 | Theoretical & Applied Mechanics Letters2013，3，1： | 11 |
| 5 | Experimental investigation on micro-dynamic behavior of gas explosion suppression with SiO_2 fine powders显示文摘To study the effect of inert dust on gas explosion suppression mechanism,SiO_2 fine powders were sprayed to suppress premixed CH_4-Air gas explosion in a 20 L spherical experimental system.In the experiment,high speed schlieren image system was adopted to record explosion flame propagation behaviors,meanwhile,pressure transducers and ion current probes were used to clearly record the explosion flame dynamic characteristics.The experimental results show that the SiO_2 fine powders suppressed evidently the... | Xianfeng Chen,~(1,2,a)) Yin Zhang,~1 Qingming Zhang,~2 Shaofeng Ren,~1 and Jianxing Wu~1 1)School of Natural Resources and Environmental Engineering,Wuhan University of Technology, Wuhan 430070,China 2)State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology, Beijing 100081,China | 2011 | Theoretical & Applied Mechanics Letters2011，1，3： | 8 |
| 6 | Coupled modeling of tumour angiogenesis, tumour growth,and blood perfusion显示文摘This paper proposes a more realistic mathematical simulation method to investigate the dynamic process of tumour angio-genesis by fully coupling the vessel growth,tumour growth and associated blood perfusion.The tumour growth and angiogenesis are coupled by the chemical microenvironment and the cell-matrix interaction.The haemodynamic calculation is carried out on the new vasculature,and an estimation of vessel collapse is made according to the wall shear stress criterion.The results are consistent with physiological observations,and further confirm the application of the coupled model feedback mechanism.The model is available to examine the interactions between angiogenesis and tumour growth,to study the change in the dynamic process of chemical environment and the vessel remodeling. | Y.Cai,1,2 S.X.Xu,1,a) J.Wu,3 and Q.Long 2,b) 1) Department of Mechanics and Engineering Science,Fudan University,Shanghai 200433,China 2) Brunel Institute for Bioengineering,School of Engineering and Design,Brunel University,Uxbridge,Middlesex,UK 3) School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China | 2011 | Theoretical & Applied Mechanics Letters2011，1，4： | 8 |
| 7 | Current trends and future directions in turbulent thermal convection显示文摘The system of turbulent thermal convection is introduced.Progresses in recent decades in the four major areas of research in turbulent convection are briefy reviewed.Some of the recent trends of the feld are then discussed,which also serve to point out that the future directions in this important feld of fuid mechanics lie in the extension to the non-standard or non-classical Rayleigh–Bénard confguration. | Ke-Qing Xia | 2013 | Theoretical & Applied Mechanics Letters2013，3，5： | 8 |
| 8 | A convenient look-up-table based method for the compensation of non-linear error in digital fringe projection显示文摘Although the structured light system that uses digital fringe projection has been widely implemented in three-dimensional surface profile measurement, the measurement system is susceptible to non-linear error. In this work, we propose a convenient look-up-table-based(LUT-based) method to compensate for the non-linear error in captured fringe patterns. Without extra calibration, this LUT-based method completely utilizes the captured fringe pattern by recording the full-field differences. Then, a phase compensation map is established to revise the measured phase. Experimental results demonstrate that this method works effectively. | Chen Xiong Jun Yao Jubing Chen Hong Miao | 2016 | Theoretical & Applied Mechanics Letters2016，6，1： | 8 |
| 9 | Prolonged simulation of near-free surface underwater explosion based on Eulerian finite element method显示文摘n the area of naval architecture and ocean engineering,the research about the underwater xplosion problem is of great significance.To achieve prolonged simulation of near-free surface underwater explosion,the underwater explosion transient numerical model is established in this paper based on compressible Eulerian finite element method(EFEM).Compared with Geers Hunter formula,EFEM is availably validated by simulating the free-field underwater xplosion case.Then,the bubble pulsation and flow field dynamic characteristics of the cases with different underwater explosive depth are compared in this work.Lastly,the height of the water hump and the pressure of flow flied are analyzed quantitatively through the simulation results. | Ming He A-Man Zhang Yun-Long Liu | 2020 | Theoretical & Applied Mechanics Letters2020，10，1： | 7 |
| 10 | Crashworthiness design of density-graded cellular metals显示文摘Crashworthiness of cellular metals with a linear density gradient was analyzed by using cell-based finite element models and shock models.Mechanisms of energy absorption and deformation of graded cellular metals were explored by shock wave propagation analysis.Results show that a positive density gradient is a good choice for protecting the impacting object because it can meet the crashworthiness requirements of high energy absorption,stable impact resistance and low peak stress. | Xiaokai Wang Zhijun Zheng Jilin Yu | 2013 | Theoretical & Applied Mechanics Letters2013，3，3： | 7 |
| 11 | Experimental investigation on drag reduction in turbulent boundary layer over superhydrophobic surface by TRPIV显示文摘This study aims at the mechanism of drag reduction in turbulent boundary layer(TBL) with superhydrophobic surface.Comparing the time-resolved particle image velocimetry(TRPIV) measurement results with that of hydrophilic surface,the drag reduction rate over a superhydrophobic surface is approximately10%.To investigate the characteristics of coherent structure in a drag-reduced TBL with superhydrophobic surface,a modified multi-scale spatial locally-averaged structure function is proposed for detecting coherent structure.The conditional sampling and spatial phase-lock average methods are employed to obtain the topology of physical quantities like the velocity fluctuation,spanwise vorticity,and Reynolds stress during eject and sweep process.The results indicate that the suppression of coherent structure burst in the near-wall region is the key mechanism in reducing the skin friction drag for TBL over superhydrophobic surface. | Haiping Tian Jingxian Zhang Erdan Wang Zhaohui Yao Nan Jiang | 2015 | Theoretical & Applied Mechanics Letters2015，5，1： | 7 |
| 12 | Thrust producing mechanisms in ray-inspired underwater vehicle propulsion显示文摘This paper describes a computational study of the hydrodynamics of a ray-inspired underwater vehicle conducted concurrently with experimental measurements.High-resolution stereo-videos of the vehicle's fin motions during steady swimming are obtained and used as a foundation for developing a high fidelity geometrical model of the oscillatory fin.A Cartesian grid based immersed boundary solver is used to examine the flow fields produced due to these complex artificial pectoral fin kinematics.Simulations are carried out at a smaller Reynolds number in order to examine the hydrodynamic performance and understand the resultant wake topology.Results show that the vehicle's fins experience large spanwise inflexion of the distal part as well as moderate chordwise pitching during the oscillatory motion.Most thrust force is generated by the distal part of the fin,and it is highly correlated with the spanwise inflexion.Two sets of inter-connected vortex rings are observed in the wake right behind each fin.Those vortex rings induce strong backward flow jets which are mainly responsible for the fin thrust generation. | Geng Liu Yan Ren Jianzhong Zhu Hilary Bart-Smith Haibo Dong | 2015 | Theoretical & Applied Mechanics Letters2015，5，1： | 6 |
| 13 | Progress on design and related R&D activities for the water-cooled breeder blanket for CFETR显示文摘The water-cooled ceramic breeder (WCCB) blanket is one of the blanket candidates for Chinese fusion engineering testing reactor (CFETR) and is being developed at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). This paper reviews design and evolution of the WCCB blanket for CFETR, and presents a new WCCB blanket design according to the latest CFETR core parameters (major and minor radii are R = 7.2 m and a = 2.2 m, respectively) and missions. This new design is expected to satisfy multiple CFETR operation modes of 0.2, 0.5, 1.0, and 1.5 GW fusion power and achieve tritium self-sufficiency. The feasibility of the updated blanket design is evaluated from the aspects of neutronics and thermo-hydraulics. Furthermore, the research and development (R&D) activities supporting to the WCCB blanket for CFETR are reported, including the design code, the water loop experiments, the pebble bed modeling and experiments, and the components fabrication technology. | Songlin Liu Xiaoman Cheng Xuebin Ma Lei Chen Kecheng Jiang Xia Li Hui Bao Jichao Wang Wanjing Wang Changhong Peng Peng Lu Min Li Kai Huang | 2019 | Theoretical & Applied Mechanics Letters2019，9，3： | 6 |
| 14 | Evolution of vortices in the wake of an ARJ21 airplane: Application of the lift-drag model显示文摘Wake separation is crucial to aircraft landing safety and is an important factor in airport operational efficiency.The near-ground evolution characteristics of wake vortices form the foundation of the wake separation system design.In this study,we analysed the near-ground evolution of vortices in the wake of a domestic aircraft ARJ21 initialised by the lift-drag model using large eddy simulations based on an adaptive mesh.Evolution of wake vortices formed by the main wing,flap and horizontal tail was discussed in detail.The horizontal tail vortices are the weakest and dissipate rapidly,whereas the flap vortices are the strongest and induce the tip vortex to merge with them.The horizontal tail and flap of an ARJ21 do not significantly influence the circulation evolution,height change and movement trajectory of the wake vortices.The far-field evolution of wake vortices can therefore be analysed using the conventional wake vortex model. | Jun-Duo Zhang Qing-Hai Zuo Meng-Da Lin Wei-Xi Huang Wei-Jun Pan Gui-Xiang Cui | 2020 | Theoretical & Applied Mechanics Letters2020，10，6： | 6 |
| 15 | A chemo-mechanical model coupled with thermal effect on the hollow core–shell electrodes in lithium-ion batteries显示文摘Electrode is a key component to remain durability and safety of lithium-ion(Li-ion) batteries. Li-ion insertion/removal and thermal expansion mismatch may induce high stress in electrode during charging and discharging processes. In this paper, we present a continuum model based on COMSOL Multiphysics software, which involves thermal, chemical and mechanical behaviors of electrodes. The results show that,because of diffusion-induced stress and thermal mismatch, the electrode geometry plays an important role in diffusion kinetics of Li-ions. A higher local compressive stress results in a lower Li-ion concentration and thus a lower capacity when a particle is embedded another, which is in agreement with experimental observations. | Bin Hu Zengsheng Ma Weixin Lei Youlan Zou Chunsheng Lu | 2017 | Theoretical & Applied Mechanics Letters2017，7，4： | 6 |
| 16 | Study on the thermal protection performance of superalloy honeycomb panels in high-speed thermal shock environments显示文摘The thermal protection performance of superalloy honeycomb structure in high-temperature environments are important for thermal protection design of high-speed aircrafts. By using a self-developed transient aerodynamic thermal simulation system, the thermal protection performance of superalloy honeycomb panel was tested in this paper at different transient heating rates ranging from5℃/s to 30℃/s, with the maximum instantaneous temperature reaching 950℃.Furthermore, the thermal protection performance of superalloy honeycomb structure under simulated thermal environments was computed for different high heating rates by using 3D finite element method, and a comparison between calculational and experimental results was carried out. The results of this research provide an important reference for the design of thermal protection systems comprising superalloy honeycomb panel. | Dafang Wu Anfeng Zhou Liming Zheng Bing Pan Yuewu Wang | 2014 | Theoretical & Applied Mechanics Letters2014，4，2： | 6 |
| 17 | Videometric research on deformation measurement of large-scale wind turbine blades显示文摘Utilization of wind energy is a promising way to generate power,and wind turbine blades play a key role in collecting the wind energy effectively.This paper attempts to measure the deformation parameter of wind turbine blades in mechanics experiments using a videometric method. In view that the blades experience small buckling deformation and large integral deformation simultaneously, we proposed a parallel network measurement(PNM) method including the key techniques such as camera network construction,c... | Xiangyi Sun,Yun Yuan,~(a))Zhaokun Zhu,Xiaohu Zhang,and Qifeng Yu College of Aerospace and Materials Engineering,National University of Defense Technology,Changsha 410073, Hunan,China | 2011 | Theoretical & Applied Mechanics Letters2011，1，1： | 5 |
| 18 | Wind tunnel tests of stratospheric airship counter rotating propellers显示文摘Aerodynamic performance of the high-altitude propeller,especially the counter rotation effects,is experimentally studied.Influences of different configurations on a stratospheric airship,included 2-blade counter-rotating propeller(CRP),dual 2-blade single rotation propellers(SRPs) and 4-blade SRP,are also indicated.This research indicates that the effect of counter rotation can greatly improve the efficiency.It shows that the CRP configuration results in a higher efficiency than the dual 2-blade SRPs configuration or4-blade SRP configuration under the same advance ratio,and the CRP configuration also gains the highest efficiency whether under the situation of providing the same trust or absorbing the same power.It concludes that,for a stratospheric airship,the CRP configuration is better than the multiple SRPs configuration or a multi-blade SRP one. | Yaxi Chen Peiqing Liu Zhihao Tang Hao Guo | 2015 | Theoretical & Applied Mechanics Letters2015，5，1： | 5 |
| 19 | Analysis of structural behavior during collision event accounting for bow and side structure interaction显示文摘The main goal of this study was to investigate the effects of selected ship collision parameter values on the characteristics of the absorbed energy in several ship collision scenarios.Non-linear simulations were performed using a finite element method(FEM)to obtain virtual experiment data.In the present research,the size of the side damage from a collision phenomenon were measured and used to verify the numerical configuration together with the calculation results using an empirical equation.Parameters in the external dynamics of a ship collision such as the location of the contact point and velocity of the striking ship were taken into consideration.The internal energy and deformation size on the side structure were discussed further in a comparative study.The effects of the selected parameters on several structural behaviors,namely energy,force,and damage extent were also observed and evaluated in this section.Stiffener on side hull was found to contribute significantly into resistance capability of the target ship against penetration of the striking bow.Remarkable force during penetration was observed to occur when inner shell was crushed as certain velocity was applied in the striking bow. | Aditya Rio Prabowo Dong Myung Bae Jung Min Sohn Ahmad Fauzan Zakki Bo Cao Qing Wang | 2017 | Theoretical & Applied Mechanics Letters2017，7，1： | 5 |
| 20 | Quasi-static tensile deformation and fracture behavior of a highly particle-filled composite using digital image correlation method显示文摘Polymer bonded explosives (PBXs) are highly particle-filled composite materials.This paper experimentally studies the tensile deformation and fracture behavior of a PBX simulation by using the semi-circular bending (SCB) test.The deformation and fracture process of a pre-notched SCB sample with a random speckle pattern is recorded by a charge coupled device camera.The displacement and strain fields on the observed surface during the loading process are obtained by using the digital image correlation method.The crack opening displacement is calculated from the displacement fields,the initiation and propagation of the crack are analyzed.In addition,the damage evolution and fracture mechanisms of the SCB sample are analyzed according to the strain fields and the correlation coefficient fields at different loading steps. | Zhongbin Zhou,Pengwan Chen,Baoqiao Guo,Zhuoping Duan,and Fenglei Huang State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China | 2011 | Theoretical & Applied Mechanics Letters2011，1，5： | 5 |
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