Showing papers in "Theoretical and Applied Mechanics Letters in 2013"

TL;DR: In this article, the system of turbulent thermal convection is introduced and progress in recent decades in the four major areas of research in turbulent convection are briefly reviewed, which also serve to point out that the future directions in this important field of fluid mechanics lie in the extension to the nonstandard or non-classical Rayleigh-Benard configuration.

TL;DR: In this paper, an optimization procedure for the improvement of the contact quality between the pantograph and the catenary is proposed based on the redesign of the Pantograph head suspension characteristics.

TL;DR: This paper presents why Xcas/Giac is finally selected, among other long-term promising projects like Axiom, Maxima, Sage or Yacas, among the choice criteria, the accessibility, the portability, the ease of use, the automatic export to C language, and the similarity with the MuPAD language are all considered.

TL;DR: In this paper, a gradient-based optimization algorithm is used to pinpoint the optimal kinematics maximizing the propellent efficiency of a 3D unsteady vortex lattice method.

TL;DR: In this article, the authors analyzed the crashworthiness of cellular metals with a linear density gradient by using cell-based finite element models and shock models and explored the mechanisms of energy absorption and deformation of graded cellular metals by shock wave propagation analysis.

TL;DR: In this paper, the authors reviewed the current state of art of research on fire dynamics of high-rise buildings, including the up-to-date progress of the National Basic Research Program (973) of China.

TL;DR: In this article, the effects of the free-play nonlinearity gap on the behavior of the harvester in terms of cut-in speed and level of harvested power were investigated.

TL;DR: In this article, a nonlinear porous flow model for low-permeability porous medium is presented, which reveals the microscopic mechanisms of flows and clarifies properties of porous flow fluids.

TL;DR: In this article, the authors proposed a new strategy for the dynamic simulation of cutting processes, which couples Lagrangian particle methods, such as the smoothed particle hydrodynamics (SPH) method, and multibody system (MBS) tools using co-simulations.

TL;DR: In this paper, an alternate form of the classical effective thermal conductivity model (Maxwell model) for two-phase porous materials is presented, serving an explicit thermo-physical basis.

TL;DR: In this paper, the deformation-triggered new pattern is triggered by a reversible elastic instability under the axial compression, and the influence of geometry and shapes of the holes on the mechanical property of architecture material is studied in more details.

TL;DR: In this article, a new simulation model known as mangrove-hardwood hammock model coupled with saturated-unsaturated transport (MANTRA) has been developed by the authors to simulate groundwater salinity regimes in the presence of vegetation competition, subject to climate change.

TL;DR: In this paper, a comparison between the responses of the rigid and rigid-flexible coupling multibody models shows that the flexibility of the vehicle parts significantly affects the acceleration at each position, and it is necessary to take the flexibility effects into account for the assessment of ride comfort.

TL;DR: In this paper, the authors derived an explicit relationship among applied stress tensor, material-fabric tensor and force-manufactured tensor for granular material under biaxial and triaxial loading conditions.

TL;DR: In this article, a coupled computational fluid dynamics and discrete element method (CFD-DEM) approach is presented for the prediction of sand heap formation in water through hopper flow, where the granular particle system is modeled by DEM and the fluid flow is simulated by solving the locally averaged Navier-Stokes equation with CFD.

TL;DR: In this paper, the poroelasticity theory is applied to the finite element method for hydrogel-based soft devices, and the normalization of physical parameters and the treatment of boundary conditions are discussed.

TL;DR: Wang et al. as discussed by the authors carried out the simulation of tsunami propagation based on the fully nonlinear and highly dispersive Boussinesq model, which could describe the nonlinearity and dispersion of water waves quite well.

TL;DR: In this paper, a 3D cylindrical joint model which accounts for the clearance, the misalignment and the friction is presented, which is used to represent the link between the planet gears and the planet carrier in an automotive differential model.

TL;DR: In this article, the influence of the volume concentration of the nanoparticles on the three-phase contact line motion was investigated and it was found that the larger volume concentration results in more visible nanoparticle adsorption on solid surface.

TL;DR: In this paper, a modified model describing the constitutive relation of viscoelastic dielectric elastomer (DE) was presented, which can describe the strong nonlinear behavior between deformation and mechanical stress of the material in a common stretching rate range.

TL;DR: An overview of the different experimental models, such as scale models, simplified models, full-scale mockups, and actual air cabins, is given in this article, where different modeling strategies for CFD simulations are also discussed.

TL;DR: Wang et al. as mentioned in this paper developed a tsunami warning system based on tsunami buoys in the South China Sea (SCS), which played an important role in the warning process of Japan tsunami on March 11, 2011.

TL;DR: In this paper, the adjoint-based control methodology has shown to be a robust tool to suppress noise radiation in atwo-dimensional mixing layer due to the growing of instability waves and vortex pairings.

TL;DR: In this paper, the steering performance of an inverted pendulum vehicle with pedals is discussed based on experiments on a prototype, and it is found that setting appropriate feedback gains for the handle steering angle and its rate of rotation, which control the right and left wheel driving torques, resulted in greatly improved maneuverability.

TL;DR: A distributed protocol for sampled-data synchronization of coupled harmonic oscillators with controller failure and communication delays is proposed, and a brief procedure of convergence analysis for such algorithm over undirected connected graphs is provided.

TL;DR: A cell mapping method for multi-objective optimal feedback control design in time domain for a nonlinear Duffing system with time delay and a hybrid algorithm for global optimal solutions is presented.

TL;DR: In this paper, the form invariance of the Navier's equation under the conformal mapping based on the Helmholtz decomposition method has been proved and the validity of this approach is confirmed by an active stealth device which can disguise the signal source by changing its position.

TL;DR: In this paper, an approach for both the specified motion of the biped and its ground reaction forces was presented yielding a combined motion and force control problem, in order to avoid impacts.

TL;DR: Wang et al. as mentioned in this paper developed strength softening models for exploring rainfall-induced landslide mechanism based on Mohr-Coulomb strength theory with both saturation degree and temporal evolution into consideration.

TL;DR: In this paper, the acoustic emission features in rock fracture are simulated numerically with discrete element model (DEM) using spherical particles bonded via the parallel bond model, and the failure criterion of bonded particle is coupled by the shear and tensile strengths, which follow a normal probability distribution.