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An extended car-following model is proposed by incorporating the anticipative information by vehicle to vehicle. The stability condition of the proposed model is obtained by using the linear stability theory. The results show that the anticipative information can promote the stability of traffic flow. Numerical simulations are carried out, and the results are consonant with the theory ones.
Plastic profiles produced by extrusion die are cooled down and calibrated by calibrators, so it is very important to properly design the cooling system in calibrator for the profile quality. Based on the finite element method (FEM) and the finite difference method (FDM), the numerical simulation of the cooling process is realized for plastic profile within calibrator. The simultaneous shape and topology...
In this paper, we proposed a new car following model based on the Full Velocity Difference (FVD) model, with the acceleration of the front car considered. Compared with the FVD model, the improved model can simulate the motions of cars starting from a traffic signal more nature. Numerical simulation results show that the stability of the improved model is better than the FVD model, with appropriate...
Considering effects air turbulent and other chemical reactions in blast furnace (BF) raceway, the raceway turbulent mathematical model was built. CFX software has been applied to complete the numerical simulation of the mathematical model and to analyze the physical and chemistry states in a visualization way. The maximum concentration of CO is about 27.4% under the condition of 1000 coke particles...
Applying the method of CFD, velocity and temperature fields of three-dimensional displacement ventilation system with double heat sources are numerically simulated. Comparisons of computational results with experimental data are made. The paper analyzes influence of different influential factors. It is found that people's requirement for comfort can be satisfied easily when the distance between heat...
In this paper, we presented a new analytical model for the transconductance and output conductance of submicron gate-length GaAs MESFET transistors. After an analytical study of the current voltage characteristics, the transconductance and drain conductance mathematical expressions are determined as a function of the drain and gate voltages in different operations regimes (linear, non-linear and saturated)...
The multi-wing butterfly attractors generated from Lü system via a single or multiple pulse function control is proposed in this paper. With the introduction of the single or multiple pulse function to the third equation of Lü system, the additional index-2 equilibrium points are created, from which multi-wing attractors are evolved. The evolutions of the strange four-wing butterfly attractor and...
The saving energy with train operation is more important than before from the view points of the global environment. However the energy saving design on the traction equipments sometimes has a trade off relation against the down sized and lighter weight traction equipments. In this paper, an optimizing method of the generic algorithm is applied to the numerical simulation to calculate the consuming...
In this paper, based on the mean-field theory, we propose a new susceptible-infected-removed (SIR) model to study epidemic spreading on scale-free networks with traffic flow. Theoretical analysis shows that as the network traffic flow increases, the epidemic prevalence is obviously enhanced, and the epidemic threshold is reduced. We also find that the epidemic threshold is related to the ratio between...
Objectives of this paper are to simulate flow velocity patterns of cardiac valves in normal and abnormal conditions using electrical equivalent lumped parameter Cardiovascular System (CVS) model and validate with real subjects' echocardiograph. Our model consists of detailed representation of supine human CVS with baroreflex control. Cardie valves are characterized by resistance, inertance and bernoulli's...
This paper used the finite element method to analyze the cerebrovascular bifurcation. By comparison, we constructed two intracranial artery bifurcation vessel models with different angles, and considered different model how to influence vascular blood flow based on the basic principles of hemodynamics. Through experiment, we mainly computed the value of blood velocity and wall pressure, and compared...
The paper presents a thermodynamic model for a scroll compressor used for Compressed Air Energy Storage. The model includes energy conservation equation, instantaneous volume equation and gas leakage equation. The numerical simulation results are achieved by means of the 4th order Runge-Kutta method under Matlab and are compared with the experimental values. Different performance parameters of the...
In order to solve the Semidefinite Programming, this paper introduces the recurrent neural network model. By introducing the equivalent variational inequality problem and the neural network which has the same solution with the variational inequality, the model converges to the solution of semidefinite programming. At the same time, numerical simulation also proves it very well. In short, neural network...
By analyzing hydrogeological conditions of panxi coal, the coupling mathematical model of heat-transfer is developed in surrounding rock.Temperature field and seepage field distribution of fracture rock is described by using heat-transfer and seepage differential equations. Combined with boundary condition and parameters, the numerical solution is obtained by using numerical software. The results...
Nowadays, Earth observation satellites are widely used to acquire high quality, and the satellites should have more observation missions at the same time. In this case, it is useful to develop a systematic command generation method for satellite pointing to acquire wide area image efficiently. In this paper, three efficient methods are proposed to operate Earth observation satellite attitude pointing...
A numerical investigation has been performed on the pressure drop and friction factor of water flow in three different shapes of microchannel heat sinks which are rectangular, trapezoidal, and triangular for Reynolds number range of 100-1000. The three-dimensional steady, laminar flow and heat transfer governing equations are solved using the finite volume method. It is found that the values of Poiseuille...
The pseudo-MOS transistor (Psi-MOSFET characteristics) is a simple and successful technique for the monitoring of silicon-on-insulator (SOI) wafer quality. To characterize modern ultrathin films, a reconsideration and review of Psi-MOSFET physics and models is required. Selected numerical simulations are presented, which shed light on the intriguing features governing Psi-MOSFET characteristics. Updated...
State estimation base on a nonlinear programming model is presented (NLSE), which is applied the vectorization mode. We choose the L2 norm estimation as object. The nonlinear programming with equality constraint introduced slack variables, can guarantee the robust of the algorithm and dispose the convergence problem. The symmetric coefficient matrix of correction equation can be used by apply the...
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