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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...
This paper is dedicated on the system-level thermal design and modeling for AMS-02 (Alpha Magnetic Spectrometer) avionics, with the goal of obtaining a reliable thermal control system. Electronics system thermal design is illustrated with the combination of both passive and active thermal control concepts. Detailed TMM (Thermal Mathematical Model) and GMM (Geometric Mathematical Model) for main radiator,...
Aiming at the problem that common sliding mode control method can not satisfy the control need of nonlinear system with disturbances and uncertainties, this paper proposed a modified global fast terminal sliding mode control method with time-delay estimation (TDE), through which, the disturbances and uncertainties were estimated and simulation analysis was carried on the brushless DC motor actuator...
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...
Support vector machine (SVM) algorithms were introduced to analyze the quality of seawater, and two models were constructed to analyze different seawater qualities, one is the SVM model for recognizing two kinds of seawater and the other is hierarchical support vector machines (H-SVMs) model for recognizing multi-seawater. The decision function of the first model for recognizing two kinds of seawater...
In accordance with the requirements management of cold soybean growth characters integrated climatic conditions, soil fertility status of region, the laws of cold soybean absorbing nutrients, the soil nutrient supplying capacity and other various factors to set up models and rules. The system based on the object-oriented technology of JSP VB VC had some trials on middle plant part (Hailun), west plant...
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...
This paper researches on oil pressure characteristic in the shift control unit of a heavy vehicle's automatic transmission. The simulation model of its control unit was founded in the ITI-SimulationX software. Through a bench experiment, the correctness and effectiveness of the model has been checked. To solve the early failure problem of the clutch in the road test, optimizing its oil characteristic...
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...
In this paper, the starting process of high-voltage permanent magnet synchronous motor (HV-PMSM) was calculated and analyzed by the time-stepping Finite Element Method (FEM) coupling with field and circuits. First, the mathematical model of starting process of HV-PMSM was established. Then the starting performance was analyzed by calculating the equations of transient electromagnetic field and mechanical...
The magnetization current component and torque current component can not be decoupled completely in rotor field-orientation vector control. In order to overcome this shortcoming, based on series decoupling theory, a deviation decoupling method is proposed. Under the above method, a discrete deviation decoupling controller is designed. The mathematical calculations process of discrete decoupling controller,...
Based on powerful data analysis software Matlab platform to analyze the spatial variability of NH4+-N desorption in soil polluted by rare earth leaching, through the analysis of trend surface, we can know that: under different mass ratios of desorption agent and contaminated soil, the spatial distribution variability of NH4+-N in soil is significant, reacting the significant desorption effect of desorption...
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...
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.
The D-S reasoning has a big advantage of presentation, resolution and combination for uncertainty information problems, that makes it can be effectively applied in multi-sensor data fusion. However, the Dempster combination rule doesn't take proper measures to address the reliability, conflict and importance aspects of measuring the source-evidence itself, this weakness may result in the existence...
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...
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