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This article has carried on the simple introduction to the VAR meaning and the computational method, uses CAPM (capital asset fixed price model) to carry on the modeling to the financial property repayment, carries on the fitting using the EGARCH model to the financial property repayment undulatory property, has established the financial property risk value model. The real diagnosis analysis explanation...
Establish the geometric model of the pump body using the three dimensional modeling software based on the drawing pump parts. After a reasonable simplification, analyze and calculate the force of the pump body applying the traditional theory. Take the results as the boundary conditions for the software analysis. Introduce the model into the ANSYS software and calculate the stress and strain. Such...
A nonlinear three-dimensional finite element analysis of exterior RC column-to-steel beam (RCS) connection is performed by ANSYS finite element software. The numerical results, including the lateral load-drift relationship, lateral load-joint shear distortion relationship, shear stress distribution and effective width of the steel web at the last convergence substep, are compared with experimental...
In order to evaluate bridge structures' bearing capacity quickly, the frequency coefficient method was proposed. The formula between frequency coefficient and deflection coefficient was established through stiffness based on theory, and it was revised by the statistics results of 173 samples. The rational range of frequency coefficient was built by regression equation based on the confirmed range...
According to the matrix representation of cubic NURBS surface, this paper presents a G1 continuity sufficient condition for common intersection point of three patches of adjacent cubic NURBS surface and provides specific algorithm for control points and weights of cubic NURBS surface.
This paper builds the assembly models of double crank ring-plate-type pin-cycloidal gear planetary drive with three gears in Pro/E software system and dynamics virtual prototypes in ADAMS software system, and the working process of reducer in the conditions of no-load and full-load is simulated. The models of virtual prototypes for dynamics analysis are correct by virtual test and a good design basis...
A mixed obstacle avoidance algorithm for intelligent vehicles to avoid dynamic obstacles is presented in uncertain environments. Traditional Vector Field Histogram method is combined with kalman prediction algorithm in this algorithm. The kalman predictor forecasts the optimal position estimation of dynamic obstacles at the next moment, then the intelligent vehicle calls VFH algorithm to avoid obstacles...
Introduced the method of artificial neural networks, established a three-tier management of forest resources feed-forward back-propagation neural network model. Simulation results show that artificial neural network model can be applied to dynamic simulation of forest resources. And high precision, linear regression equation is a strong correlation. The results clearly demonstrate the superiority...
A level set method for shape optimization of the Stokes fluid flow is presented. Since the level set method is implemented in an Euler framework, the computational cost is moderate. The velocity field on boundaries is obtained by shape sensitivity analysis using the material derivative concept and adjoint variable technique. A Benchmark examples is provided to illustrate the efficiency and feasible...
The camera calibration precision directly affects the computer vision application. A method for improving camera calibration precision is proposed in this paper, which follows in details: Firstly, a new iterative sub-pixel detection approach based on the Forstner operator is proposed. Secondly, instead of print plane, this paper uses LCD (completely flat Liquid Crystal Display) for camera calibration...
Summarize the main progress of research on Location—Routing Problem and the advance of optimal algorithm of LRP, give a comment on the research progress of LRP optimization algorithm and its characters, at last focus on putting forward some important development direction in this field. The optimal algorithm for the problems of LRP including location—allocation problems(LA),vehicle routing problem...
This paper takes a kind of 3-TPT Parallel Machine Tool (PMT) as the objective of research. First, the kinematic analysis is carried out to the machine and the kinematics equation is obtained. Then, the mathematical model on position error of movable platform of this machine is established in considering the joint gap based on the kinematics equation. According to the mathematical model expression,...
An acceleration method of an iterative method for algebraic equations is proposed in this paper, it is an improvement on the paper [1]. The new method retains all the advantages of the original method, and to improve the convergence speed. Therefore, the new method is better than the original method.
Vehicle loads are the most important live load on bridges. It's significant to study the maximum vehicle load in serving period for bridge design, maintenance and safety-evaluation. Stochastic process, such as Possion process or Erlang process, is a powerful model for understanding vehicle loads. While Possion process or Erlang process is only fit for vehicle load acting on one specific bridge, but...
This paper based on the heat generation of iron core and windings of transformers, makes a detailed analysis of production costs of iron core and load losses and the influence on top oil temperature and hot-spot temperature of transformers. It also explains clearly the meanings of parameters in winding hot-point temperature equation recommended by GB/T 15164-1994 Loading Guide for Oil-immersed Power...
The positive solutions to the stability of Heun Method in solving stochastic differential equations are studied. In the circumstance of measurement noise, the sufficient and necessary conditions for the mean square stability, the mean-square stability and exponential stability of Heun method in solving autonomous scalar stochastic differential equations was gained by using the property of stochastic...
In this paper, we use the homotopy analysis method (shortly HAM) to obtain the numerical solutions of Poisson equation with boundary conditions. The series solution is developed and the recurrence relations are given explicitly. The initial approximation can be freely chosen with possible unknown constants which can be determined by imposing the boundary and initial conditions. The comparison of the...
In order to improve the machining accuracy of spiral bevel gear, the model of machine tool for spiral bevel gear was built to correct the tooth surface deviation and the actual tooth surface of spiral bevel gear had been gotten by use of latticed measurement. The quantitative mathematics relationship between the tooth surface deviations of spiral bevel gear and the corrected values of the machine-setting...
For a large class of nonlinear differential degree of stiff system, changing the past by the Newton-Raphson iterative method, the introduction of Brown Method to solve such a stiff system of numerical solution of nonlinear problems, the results of numerical experiments show that the Brown Method for solving the validity of such problems.
Motivated by the multi-splitting methods, we present two nonlinear multi-splitting algorithms for solving the quadratic matrix equation (QME). Under suitable conditions we then respectively prove the local linear and quadratic convergence of the two algorithms. Some numerical results are given to show the feasibility and effectiveness of our algorithms.
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