Current Issue : April - June Volume : 2017 Issue Number : 2 Articles : 7 Articles
A nonlinear differential equation is derived which describes the propagation of axisymmetric stationary longitudinal-bending\nwaves in infinite cylindrical shell of Timoshenko type, interacting with the external nonlinear elastic medium. A modified\nperturbation method based on the use of diagonal Pade approximants was applied to build exact solitary-wave solutions of the\nderived equation in the form of traveling front and the traveling pulse. Numerical solutions of the equation, obtained by means of\nfinite difference method, are in good agreement with the corresponding exact analytical ones....
The rigid-flexible coupling system with a hub and concentrated mass is studied in this paper.Considering the second-order coupling\nof axial displacement which is caused by transverse deformation of the beam, the dynamic equations of the system are established\nusing the second Lagrange equation and the assumed mode method.The simulation results show that the concentrated mass mainly\nsuppresses the vibration and exhibits damping characteristics. When the nondimensional mass position parameter ...
With the great prosperity of national economy, there has been a dramatic rise of vehicles\non city road, which makes increasing pressure of road transportation. Currently,\nmany countries are confronting the severe situation of traffic jam in different\ndegrees. Nevertheless, there are many triggers contributing to this congestion, one of\nwhich is the blocking of residential quarters towards vital traffic line. Therefore, it is\nextremely necessary to study whether the opening of residential quarters can improve\nthe road capacity of the entire city and remit the traffic pressure. Our paper is\nbased on graph theory, density theory and random utility theory. First of all, we\ndemonstrate a mathematical model of road traffic. Secondly, we explore the influence\nof residential quarters opening on urban traffic, taking three factors into account\nlisted as road traffic capacity, road network density and network average running\ntime. On the basis of above contents, the impact analysis of vehicle traffic caused by\npedestrians is added afterwards. Finally, our paper takes three different types of residential\nareas into account as an example to empirically analyze the tangible impact of\nthe opening, and finally come to the benefit of the traffic system after the opening....
To identify shield grouting quality based on impact echo method, an impact echo test of segment-grouting (SG) test piece was\ncarried out to explore effect of acoustic impedance of grouting layers and grouting defects on impact echo law. A finite element\nnumerical simulation on the impact echo process was implemented. Test results and simulation results were compared. Results\ndemonstrated that, under some working conditions, finite element simulation results and test results both agree with theoretical\nvalues. The acoustic impedance ratio of SG material influenced the echo characteristics significantly. But thickness frequency could\nnot be detected under some working conditions because the reflected energy is weak. Frequency feature under grouting defects was\nmore complicated than that under no grouting defects....
Thebehaviour ofmonatomic and dilute gas is studied in the slip and early transition regimes using the extended macroscopic theory.\nThe gas is confined within a two-dimensional microcavity where the longitudinal sides are in the opposite motion with constant\nvelocity �±...
The present work deals with the mechanical behaviour of thin films bonded to a homogeneous elastic orthotropic half plane under\nplain strain condition and infinitesimal strain. Both the film and semi-infinite substrate display linear elastic orthotropic behaviour.\nBy assuming perfect adhesion between film and half plane together with membrane behaviour of the film, the compatibility\ncondition between the coating and substrate leads to a singular integral equation with Cauchy kernel. Such an equation is\nstraightforwardly solved by expanding the unknown interfacial stress in series of Chebyshev polynomials displaying square-root\nsingularity at the film edges. This approach allows handling the singular behaviour of the shear stress and, in turn, reducing\nthe problem to a linear algebraic system of infinite terms. Results are found for two loading cases, with particular reference to\nconcentrated axial forces acting at the edges of the film. The corresponding mode II stress intensity factor has been assessed, thus\nproviding the stress concentrations at both ends of the covering. Possible applications of the results here obtained range from\nMEMS, NEMS, and solar Silicon cell for energy harvesting to welded joint and building foundation....
This paper deals with analytical modelling of microstrip patch antenna (MSA) by means of artificial neural network (ANN) using\nleast mean square (LMS) and recursive least square (RLS) algorithms. Our contribution in this work is twofold.We initially provide\na tutorial-like exposition for the design aspects ofMSAand for the analytical framework of the two algorithmswhile our second aim\nis to take advantage of high nonlinearity of MSA to compare the effectiveness of LMS and that of RLS algorithms. We investigate\nthe two algorithms by using gradient decent optimization in the context of radial basis function (RBF) of ANN. The proposed\nanalysis is based on both static and adaptive spread factor. We model the forward side or synthesis of MSA by means of worked\nexamples and simulations. Contour plots, 3D depictions, and Tableau presentations provide a comprehensive comparison of the\ntwo algorithms. Our findings point to higher accuracies in approximation for synthesis of MSA using RLS algorithm as compared\nwith that of LMS approach; however the computational complexity increases in the former case....
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