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The prevention and cure of deadlock of command information system for united combat of multi-troops is the fundamental problem to ensure the safety and the reliability of system, it is also one of difficult problems to be solved. The paper puts up a kind of formal method which describes the command information system—Petri net model, giving an example of setting up intelligent running models of planning...
Shock absorber is widely used on vehicle. The purposes of the shock absorber are to dissipate the energy accumulated by the suspension spring displacement, controlling thus the vertical motion between vehicle body and tires. The shock absorber has great influence on both ride and handling performance of vehicles, and a great many previous researches have been done on modeling and simulation of the...
Piezoelectric Disc Stack Acoustic Transducer was mainly made of piezoelectric ceramic discs, which were bonded together concentrically with epoxy resin. Because of piezoelectric effect and the anisotropy characteristics of piezoelectric ceramic, when electronic signals were put on the power-lead electrodes in the thickness direction, the radial vibration generated and could be measured. In this article,...
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...
There is higher requirement for warfare simulation in depth and extent. Simulation scales need to be enlarged and more attention should be paid to the precision of warfare simulation. After analyzing the deficiency of traditional platform-level CGF (Computer Generated Forces) model in satisfying simulation requirements, we establish a weapon platform CGF model configuration based on battle crew. The...
This paper presents the study on data organization and structure in spatial database designs. An object-oriented spatial database model is developed for coalfield geological hazards taking into account the unique characteristics of coalfield geological hazard data structure. The model is successfully applied to the construction of a spatial database of coalfield geological hazards with Unified Modeling...
The feature extraction is one of the key steps for SAR ATR. It can greatly reduce the amount of information processing by SAR ATR, improve the identification efficiency, reduce the time of recognition and lower resources utilization by means of the feature extraction. In the beginning, the feature extraction methods are classified by target type and then various categories methods are summarized....
Due to the decline of the viability and battle effectiveness of the electronic countermeasure armored vehicle caused by intense infrared radiation (IR), the temperature model is built for the IR characterizations of moving target. While taking the effect of radiation, convection and heat transfer into consideration, the mathematic description and simulation of the temperature model are carried out...
The effect of different modeling design on temperature field of headlamp was studied. Numerical simulation of internal temperature field of headlamp was performed and temperature distributing rules were summarized. On those bases, a fast analytical model of temperature field of headlamp was presented considering flow field around the automobile. Taking one headlamp modeling design for example, numerical...
The following topics are dealt with: artificial intelligence theory and applications; computer science and applications; network technology; communication technology; system modelling and simulation; automation and control; software engineering; and information system design.
For rapid modeling and simulation of MEMS, a MEMS component library consisting of beam, anchor, plate and gap is developed with Modelica. The hierarchy structure of this library are proposed. In order to show micro component's structure, pin definitions, parameters and behaviors of mechanical beam are analyzed and then the lumped parameter beam is modeled based on object-oriented method with Modelica...
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...
In this paper, on the basis of analyzing construction characteristics and working procedure of a spade soil opener, the profile of formed hole was obtained by investigating the moving traces of the two endpoints of spade since that only these two points of the spade played the determinant roles during the hole forming within the soil and theoretical formula for calculating the length of the formed...
It is the problem that if traditional costing methods is adopted on the logistics dynamic alliance, which can cause unreasonable distribution of indirect costs, unclear fee process in cost accounting process and low-quality management of costs. Operating costing model was proposed to solve these problems on logistics dynamic alliance enterprises. Through the analysis of incurred costs on logistics...
Because the changing frequency of extreme climate events generally has profound impacts on our living environment, research of the related topic has received much attention in social sciences. Based on the daily data collected from 753 meteorological stations in China during 1961-2005, the present work studies the relationship among some extreme climate indices, that is, FEP(frequency of extreme precipitation),...
It's a focus for researchers to forecast the nonlinear data got from the reality world system. Many methods based on nonlinear models are proposed. In this paper, a forecast model based on the wavelet analysis and the neural network is proposed. Firstly, the wavelet decomposing and reconstruction should be made on the time series studied, and then neural network forecast method is applied on all the...
The equivalent circuit model is proposed in this paper, which is based on RC parallel networks, in order to model I–V performance and transient behavior of battery. The model consists of a series resistance, a self-discharge resistance and two RC networks. The I–V performance and transient behavior of the model are researched in time domain. Battery model efficiency is proved by frequency domain analysis...
In this paper, a 2nd order tunable RF CMOS LC bandpass filter with the on-chip inductor is presented. Q-enhancement and tuning are also considered. The Q-tuning is implemented through an adjustable negative conductance generator circuit. The simulated results show that the center frequency of the filter using a 0.18µm CMOS process can be operated from 1.90GHz to 2.42GHz frequency band under 3.3V supply...
Time series analysis is commonly used in economics and management research. It depicts the orderliness of the historical data changes over time with proper models, and analyzes and forecast the value of variables. Based on three modes of ARMA modeling, this paper suggests a method to predict the potential of resource of electronic waste with the data of inventory of electronic waste. With quantitative...
Platform-based development is currently a mainstream development approach of enterprise application. It means that a business infrastructure software platform is used as the foundation, and user build the specific enterprise information system through secondary development based on the platform. But the existing software platforms are too technical, and the skill requirements for developers are too...
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