Applied Mechanics and Materials Vols. 195-196

Abstract: To accurately simulate the second-order bending moment caused by the superstructure shift in the isolation system is difficult. A simulation method of considering the second-order moment is put forward in this paper, and which is used to obtain the push-over curve of the cantilever column. Comparison of the push-over curves that with or without considering the additional moment is shown in this paper. The comparison presents evidence reduction, and embodies the decrease of stiffness. This simulation method can effectively balance the affection of the upper structure shift to the vertical bearing member under the isolator.

Abstract: This paper proposes the combined direction stochastic approximation method for solving simulation-based optimization problems. The new algorithm is a stochastic analogy of conjugate gradient method, which employs a weighted combination of the current noisy negative gradient and some former noisy negative gradient as iterative direction. Our numerical experiments show that the new algorithm outperforms the classical RM algorithm for two typical simulation-based optimization problems, a.e., M/M/1 queuing problem and inventory problem.

Abstract: The main purpose of this paper is to investigate some properties of partial sums for negatively dependent random variables. By using some special numerical functions, and we get some probability inequalities and exponential inequalities of partial sums, which generalize the corresponding results for independent random variables and associated random variables. At last, exponential inequalities and Bernsteins inequality for negatively dependent random variables are presented.

Abstract: Shing is playing an important role in the large complex structural FEM simulations; it has a direct effect on calculating precision of structural simulations. For increasing the calculation accuracy and analysis accuracy of complex structure, the finite element meshing problems is proposed on the finite element analysis of large complicated structures. The effects caused by element type, mesh density and intergradations on calculating precision are studied and discussed. A research argues that with length-width ratio of 1~2 and length-thickness ration of 1.5~4.5 of two-dimensional rectangular element, the quality of meshing method of two-dimensional element is above normal. As the height of one-dimensional element is equal to the sum of reinforcing rib height of outer panel and half the thickness of panel, more accurate results can be obtained.

Abstract: Blade hydrofoil has a vital impact on efficiency of energy conversion of hydro turbine which is the core device in harnessing tidal current energy. In this paper, lattice Boltzmann method, combined with large eddy simulation (LBM-LES), where Smagorinsky model adopted, was proposed to simulate and analyze the performance of blade hydrofoil in tidal current flow with high Reynolds number in engineering application and solved the problem of instability when simulating flow with high Reynolds number using traditional lattice Boltzmann method. The results of simulation were verified by comparing with available experiment data and literatures.

Abstract: Diffusion only, two dimensional heat conduction has been described on partial differential equation. Based on Finite Volume Method, Discretized algebraic Equation of partial differential equation have been deduced. different coefficients and source terms have been discussed under different boundary conditions, which include prescribed heat flux, prescribed temperature, convection and insulated. Transient heat conduction analysises of infinite plate with uniform thickness and two dimensional rectangle region have been realized by programming using MATLAB. It is useful to make the heat conduction equation more understandable by its solution with graphical expression, feasibility and stability of numerical method have been demonstrated by running result.

Abstract: In this paper, a hybrid process modeling method for equipment support system was presented. Combining with the advantages of ARENA and UML, the models of equipment support process were constructed by the means of UML, which include function models, dynamic models and object models. The frame work of UML-ARENA simulation software was designed, and the mapping relations between UML object classes and ARENA models were founded. The equipment support process was simulated by ARENA. At last, an example was given, which proves that this hybrid modeling method is feasible and significant for its can optimize the support process, shorten the support time, and improve the usage ratio of resources.

Abstract: This paper proposed a method of flame simulation based on Lagrange process and chemical composition, which was non-grid and the problems associated with grids was overcome. The turbulence movement of flame was described by Lagrange process and chemical composition was added into flame simulation which increased the authenticity of flame. For real-time applications, this paper simplified the EMST model. GPU-based particle system combined with OpenGL VBO and PBO unique technology was used to accelerate finally, the speed of vertex and pixel data interaction between CPU and GPU increased two orders of magnitude, frame rate of rendering increased by 30%, which achieved fast dynamic flame real-time simulation.

Abstract: The research for Hamilton system is a classical problem, it has valuable applications in celestial mechanics, plasma physics, and biological engineering. But in actual management, Hamilton system can be changed into solving homoclinic solutions of differential equation or system. This paper studies the existence of homoclinic solutions for a class of second order differential equation, we will prove this equation exists at least one nontrivial homoclinic solution.

Abstract: We propose a universal single-radio multi-channel vehicle node structure (VNS) in NS-2 for VANET simulation. VNS can support different single-radio multi-channel MAC protocols, while in this paper we implement a split-phase mode MAC as channel coordination mechanism, with a three-way handshake as channel negotiation mechanism. Simulation results in sparse, dense and moving scenarios indicate that VNS is a preferable solution for simulation of VANET.