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From the viewpoints of information theory and system theory, an Information Optimizing Model is proposed based on following rules of language: efficiency, cooperation, distinction, evolution, and reliability. It proposes that language is an optimal encoding system to communicate in the most efficient way. Using this model, a hypothesis is made that when expressing the same meaning using a sentence,...
Analyzing the current developing status and actual problems of radar system simulation, based on continuous system simulation, combining signal simulation and function simulation, considering current development of simulation technique and the request of air battle to EW, the simulation system of Phased Array radar based on MATLAB/SIMULINK is presented and designed, which conquered the contradiction...
By using 10 groups of training data which were collected through testing a cellphone in order to find the overall functions in it, a size estimation model was built by using Mathematics, a tool to help implement a fitting method for the parameters in COCOMO model. By invoking the FindFit function and using the least square method, the parameters were fixed. With two groups of test data, the size estimation...
The complete stress-strain curve of rock is the mechanical property data which is used widely and the most elementary and important. But the material of rock is of special complex natural structure. It is very hard to obtain the complete and true performance data of rock by the common material tester which causes rock broken easily. This paper studies the rock mechanics tester intelligently controlled...
In this paper, kinematic analysis of the 5-PPaPaU parallel mechanism with parallelogram loops was presented. Based on the analysis on the DOF of the mechanism, the prismatic joints placed on the base were chose as actuators. The singularity configuration of the mechanism was researched. The successive transformation matrixes were derived, and then the inverse kinematic equations and direct kinematic...
This paper has presented a numerical algorithm for reconstructing CT TF models of systems with pure integrators from their ZOH DT equivalents. The algorithm used basic recursion and simple polynomial manipulations and is well suited for CACSD software. The algorithm performs the reconstruction solely in the frequency-domain; hence avoids intermediate unnecessary steps of realizing the TF in SS and...
Probabilistic neural network (PNN) model is a kind of artificial neural network, which is simple in structure, easy for training and widely used. This method uses Bayes classifying and decision-making theory to constitute the mathematic model of system. With Gauss function as activating ones, it possesses the characteristics of strong nonlinear processing and antinterfering ability. This paper introduces...
Combined with the one-dimensional isentropic flow theory, method of CFD is used to simulate the whole flow field of a certain convergent-divergent nozzle under the typical operation. The paper describes the gird generation, boundary conditions determination, flow field initialization as well as RNG k-e turbulence model application, and analyzes the nozzle aerodynamic characteristics. Studies have...
The brushless DC motor as the electric steering gear servo motor has become the future direction of development of small unmanned aerial vehicle(UAV) swarm steering gear, According to the problem of the optimization of the electric steering gear controller, the electric steering gear position controller PID parameters optimization design method based on artificial fish swarm algorithm is put forward...
In view of the deficiency of the endurance mileage of pure electric vehicle, parameter design and related analysis of powertrain for extended-range electric vehicle including power drive system, energy storage system and range extender were conducted. Based on Matlab/Simulink, model of extended-range electric vehicle was built and simulation was carried out in the NEDC driving cycle. The simulation...
The phase field method is an effective method on solidification microstructure simulation. In this paper, the basic principles and the phase field model are introduced respectively. And then, the applications of phase-field simulation on solidification microstructure are summarized briefly. Finally, the problems to be faced and the future development trends are pointed out in this area.
This paper mainly investigates adaptive synchronization of complex Lü system with uncertain parameters. On the basis of Lyapunov stability theory, an adaptive controller for the synchronization of the complex Lü system is designed, and some parameter update laws for estimating the unknown parameters of the systems are also gained. The numerical simulations demonstrate the validity and feasibility...
A robust aspect ratio based agglomeration algorithm to generate coarse grids for unstructured grid and hybrid grids is proposed in this paper. The algorithm focuses on multigrid techniques for the numerical solution of Navier-Stokes equations, which conform to cell-centered finite volume scheme, combines isotropie vertex-based agglomeration and high-stretched cell-based directional agglomeration to...
In this paper we study on a tracing system for infrared target and propose an optimized algorithm to track and recognize the objects such as flying target. So we need to detect the moving targets from the background in image sequences, and keep track of them by the Kaiman filter algorithm and image processing. In the first stage, we segment the moving regions from the background area with GMM(Gaussian...
The problem of absolute value operators is converted to the problem of 2 × 2 operator matrices. Using the properties of the Hadamard product, we will study some inequalities involving A∗ B + B∗ A, |A + B| and |A|, |B| A result in this paper can extend F. zhang's in paper [3] absolute value of operator equation, then can obtain the more extensive version of the Bohr inequality.
There has been a constant barrage of worms over the internet during the recent past. In order to develop appropriate tools for thwarting quick spread of worms, researchers are trying to understand the behavior of the worm propagation with the aid of epidemiological models. In this study, A SIQRS (susceptible-infected-quarantined-removed-susceptible) model with nonlinear incidence rate for the worm...
Queuing theory is to study the queue system (also called the stochastic service system) mathematical theory and method, is an important branch of operations research. Queuing theory study main question is queuing system mainly quantitative index for the probability of law, as well as system optimization problem, so use traditional mathematics method to solve this problem, requiring policy makers and...
Power system may not return to its original status and become unstable when subjected to small signal disturbance. Conventional small signal stability (SSS) theory is based on linear control system model without time delay and thus it is not fit for power system stability analysis and stabilization design when relatively larger signal transmission delay exists. In order to overcome the limitations...
Solving linear equations is key in many scientific research and engineering computing, in order to solve effectly large-scale linear matrix equalities, the traditional algorithm for solving linear equations is analysed and iterative methods is introduced to improve efficiency and reduced storage and algorithm simple. The methods suggested conjugate methods is an effective in storage and compution.
In order to solve the transfer function modelling and controller parameter optimization of control systems, a novel design scheme is presented based on prony and particle swarm optimization (PSO) method. In this scheme, an impulse signal is applied to the input of controlled member firstly, and then output signal is estimated by prony analysis to get the transfer function. Finally, controller parameter...
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