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The framework of knowledge management system and the mechanism of sharing knowledge are hot topics for researchers who employ themselves in information and knowledge. In this paper, an ontology domain model based on the nature character of knowledge is proposed to describe knowledge ontology, and an architecture of knowledge network that supporting ship design is built. At last, a tentative system...
This paper, drawing on technological innovation theory and value chain theory, establish conceptual model of scientific and technological innovation. The paper analyzes basic activities and assistant activities in scientific and technological innovation value chain, puts forward a scientific and technological innovation process model of the interaction between science and technology and market in...
Due to the environmental protection laws and regulations being strict day by day now, how to resolve the problems of serious vibration and impact construction vehicles, the poor driving comfortableness and the noise pollution occurring in the vehicles, have become a new urgent task, which affects the development of the heavy duty construction vehicles. The new visco-elastic suspension can not only...
The Initiative Locating and State Memory fixturing (IL&SM) adopts the technique of freezing workpiece in space, to realize the encapsulation, fastening and clamping in the IL&SM box. IL&SM technique is designed to “free-up” the design space and greatly expand the possible range of the parts that can be machined. It is clear that locating error is one of the factors that significantly contribute...
Based on the character of a flow of water, this paper proposes a new path planning method using potential grid method. The initial position of the robot is assumed as an artificial headstream, and then the artificial stream flows from the high potential field to the low. When the artificial stream flows to the target position, the track of the artificial stream forms a feasible obstacle avoiding trajectory...
In the textile production, there may appear many fabric defects. To fabric defects, there are a lot of image-based inspection techniques: Fourier transform, Sobel algorithm of edge inspection, fast Fourier transform (FFT) et. However, Wavelet transform is a kind of multiresolution algorithm, and its multiresolution character corresponds to time-frequency multiresolution of human vision. The result...
Aiming at the path planning for Coal Mine Detection Robot in unknown static environment, a path planning method is propounded which couples behavioural dynamics with rolling scan information. Firstly, the method of sub-target's choice is provided using heuristic function according to the rolling scan information, it is local environment information, which is obtained by sensors. Then path planning...
Nowadays, manufacturing enterprises are facing with huge challenges to react rapidly to changes and satisfy various customers' needs with respect to production volume and product profile. Reconfigurable manufacturing mode was proposed as an advanced manufacturing philosophy to enhance the adaptability and flexibility of manufacturing systems. Through both physical and logical reconfiguration, Reconfigurable...
Numerical Control Electrochemical Machining (NC-ECM) is one of the most important development to Electrochemical Machining (ECM). In this paper, the preliminary experiments of machining rotary parts with different profile surface by use of NC-ECM are presented. First, the principle of machining rotary parts by NC-ECM and the experimental equipment are described. Then, the experiments of machining...
Upsetting process is a typical large plastic deformation technology, and it is driven by traditional slider-crank mechanism. By theoretic calculation, the relations of the slide displacement, velocity and acceleration with the crank degree are studied. Their variation laws with time are researched by kinematic analysis of UG NX software. Based on the upsetting process character, a numerical model...
Tin bath is the most important equipment in float glass formation, and the glass quality depends mainly on the temperature control of the glass ribbon. Based on the analysis of tin bath formation technology, a mathematic model is set up in order to investigate the radiative heating effect of SiC heater in the formation process. The view factors are difficult to calculate using the classical method...
In this paper, the heat transfer performance of the integral fin-tube with the material of steel G20 is simulated by ANSYS. On base of the determination of thermal physical properties of G20, effects of fluid temperature and effects of structure parameters of fin-tube on heat transfer performance are obtained. When the temperature of the outer fluid is higher than that of the inner fluid, the heat...
To study the problem of welding robot task allocation for car Body-in-White (BIW) product line, built the mathematic model of the problem with the strategy of thinking about reasonable abstract and process decision in different stages. Associating strong points of hill climbing algorithm (HCA) local search and genetic algorithm (GA) global search, added directed hill climbing operator to genetic algorithm...
Feature representation is vital to manufacturability evaluation, process planning, and NC programming. A machining oriented feature definition and taxonomy are proposed. Part is represented by B-rep representation with manufacturing information such as dimensions, tolerances, and surface roughness. The machining features are recognized by rule-based algorithms implemented in ACIS modeler. The manufacturability...
It would be good and necessary that studies be made of the reliability and maintainability of a mechanical system during its whole life cycle of which the cost is an important factor affecting the performance of a product. Compared with traditional researches given separately to reliability and maintainability, this paper, based upon a previous model for the analysis of the relationship of reliability...
Based on the electrode finishing technique in electrical discharge machining (EDM), a new method is proposed in the article to fabricate meso-scale cutting tool efficiently. The research on the techniques to attain the minitype cutting tool was based on analyzing the feature of EDM on meso-scale cutting tool. The process of fabrication for minitype cutting tool is determined, and the minitype grooving...
The current research of the ultrasonic vibration assisted machining technology focused on the experimental analysis. And there are only simple theoretical introductions, which have not formed the systematic theory. Power ultrasonic vibration honing technology is more systematically studied from the kinematics point of view in this paper. And the four kinetic characteristics of the ultrasonic vibration...
For satisfying the requirement of the high speed and precision table in the chip packaging application, a high speed precision positioning table was designed. The table was driven directly by linear voice coil actuator in the direction of X, Y and Z separately. The simulation model of positioning table was set up. Dynamic optimization design of spring which is the critical component of flexible decoupling...
In view of the locating rule of rectangle packing, by introducing the method of attractive factors, this paper puts forward optimizing the calculation for each parameter of placement function by utilizing genetic algorithm. This algorithm sets the utilization ratio of the maximum area of capacity as the goal, optimizing the confirmation of each rectangle. When optimizing parameters by utilizing genetic...
The principle of NC incremental sheet metal forming and the forming process of the fender are introduced. The effect of process parameters on forming is analysed. The improvement method of the forming quality is suggested. It is important that NC incremental sheet metal forming technology is perfected. The NC incremental sheet metal forming technology is a flexible forming technology without dedicated...
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