Table of Content

  

24 October 2006
Volume 36 Issue 5

Articles


Articles

A new method to construct and optimize the constructive relationship model of hot deformation

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  9-12 .  doi:

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By integrating the thermal simulation test, nonlinear regression and Monte Carlo methods, a new method was proposed to construct and optimize the constructive relationship model of the material, which is of completely and continuously dynamic recrystallization. In addition, the effectivity of this new method was validated based on the construction and optimization of the constructive relationship model of 09CuPTiRE steel hot deformation.

hermal simulating experiment and FEM simulation of dynamic recrystallization of 09CuPTiRE steel

ZOU Feifei,GUAN Xiaojun,HAN Zhenqiang,SHEN Xiaomin,MA Xiaofei ,LIU Yunteng

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  17-20 .  doi:

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Based on the thermal simulating experiment, a dynamic recrystallization model of 19CuPTiRE steel was established. The DEFORM software was introduced to simulating the hot compressive deformation. The simulation information is obtained and used to program, which can make the visualization of the volume percentage distribution of dynamic recrystallization possible. The simulation results, which agree well with experiment results, indicate that enlarging the deformation, hightening the deformation temperature, and lowering the deformation rate will all benefit the dynamic recrystallization. Deformation and temperature influence the dynamic recrystallization distinctly. Therefore, the model and TEM simulation are proved to be effective.

Research into the effects of image quality on Harris corner detection

YAN Long,ZHAO Zhengxu,ZHOU Yiqi

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  21-24 .  doi:

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Harris corner detection is based on the pixel gradient of the image, which is restricted to the relativities between the pixels. Image quality affects the Harris corner detection, because of its direct influences on the relativities between the pixels. The image was evaluated based on several certain imaging standards. The relationship between image quality and Harris corner detection was proposed. The image quality was taken as a gist of the parameter choosing of Harris corner detection. In addition, it is suggested that the corner detection can be put in practice by choosing different parameters of the image with different qualities based on the evaluation scales.

Development of automatic programming system for NCultrasonic grinding of ceramics surface

DING Shiyan,XU Jiawen

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  25-29 .  doi:

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Each axis of NCultrasonic grinding machinetool was introduced. In order to implement NC ultrasonic grinding of parallel ruled surface, calculation of cutter location and post processing method were introduced. Data transfer process was analyzed, when Matlab engine was called from Visual C+

Interarea low frequency oscillation analysis based on Prony and sparse eigenvalue methods

YE Hua,LIU Yutian,NIU Xinsheng

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  30-34 .  doi:

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Sparse eigenvalue algorithm can be used to analyze the low frequency oscillation for bulk interarea power systems. Presently, the initial parameters choosing for the algorithm is lack of systematic method. The Prony method was used to compute the approximation of the interarea oscillation modes, which was used for initial shift points of the Shift Inverse transformation of the algorithm. The interarea low frequency oscillation modes can be obtained quickly and exactly, which provide powerful basis for installing the power system stabilizers (PSSs) on related generators to damp the interarea low frequency oscillation modes. The simulation results of North ChinaNortheast China interconnected power system demonstrate the effectiveness of the proposed technique.

Online integrated monitoring and control system in powerdistribution substation based on networks technique

WANG Zhenshu,MA Handong,ZHANG Bo,

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  35-37 .  doi:

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According to the demand of supplying the datum with nicety, credibility and safety in power system, a network technique was used to realize online integrated monitoring and control. The architecture of the system was introduced. The principle and function in the terminal of power distribution substation were described in detail. The system can realize dynamic compensating in imaginary power and safety economic operation realtime monitoring at the same time. Combined with managing analysis software, it can deal with every parameter of economic operation, and can give out every index to form report forms, to heighten the level of automatic managing.

Modeling and simulation of threephase linestart permanent magnet synchronous motor

WANG Zhenshu,MA Handong,ZHANG Bo,

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  35-39 .  doi:

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The magnetic structure and starting process of the linestart permanent magnet synchronous motor are relatively complicated. Based on MATLAB/SIMULINK and park equation, the transient model for the linestart permanent magnet synchronous motor was established and the simulation study was carry out under three phase balanced voltage.

Internal model control for force reflecting teleoperation systems

JIAN Ping,LI Qiqiang

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  49-53 .  doi:

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Communication time delay in teleoperation system communication channels always destroys the stability and transparency of the system. In order to solve these problems, a novel internal model control structure was applied to the force reflecting teleoperation system. Both controllers for master and slave were designed to achieve the force and velocity tracking of the manipulators respectively, in order to make the system well transparent. Each controller has only one control parameter, which is hardly correlative with each other and makes the control more flexible. Taking advantage of the special structure of internal model control, controller design aimed at transparency is made apart from the design for stability, which decreases the design complexity. The theoretical analysis and results of simulation validate the effectiveness of the conclusion.

Fingerprint image segmentation based on label box

REN Chunxiao,YIN Yilong,

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  54-57 .  doi:

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In order to enhance the effects of fingerprint image segmentation, spatial distribution model of pixels based on Coherence, Mean and Variance was advaced and analyzed at first. Secondly, the label box was used to establish the model and to deal with fingerprint image. Lastly, experiments were performed to evaluate the performance of this method in comparison with the methods using linear classifier and quadric surface. The results show that the proposed method provides accurate highresolution segmentation results, which has only 0.80% misclassified pixels, while the quadric surface classifier has 0.97% misclassified pixels.

Realization of the FMPPIM to MVCPSM transformation by DSL approach

SHEN Huiyong,WAN Jiancheng,HOU Jinkui

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  58-67 .  doi:

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The DSL approach is an effective solution to general problems encountered in software development. The transformation rules were proposed in a formalized way to support transformation based on MDA from a kind of platform independent model for web application to PSM using MTransDSL. A platform specific model was proposed as the target model for model transformation firstly. Then, a concrete application based on JavaServer Faces framework was provided, which can verify the feasibility of the approach. This approach represents the advantages in MDA, and upgrades the abstraction of transformation level.

The lowcost realization of a simplified project of MAN technology RPR

GUO Juxiu,WANG Yanzhang

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  62-69 .  doi:

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As an economical and practical MAC technology, Resilient Packing Ring (RPR) technology has extensive applications in MAN fibre loops. Firstly, the background of RPR presence was discussed. Secondly, the structure, characters and specific key technology were analyzed detailedly. Thirdly, the RPR criterion made by IEEE and a typical application example were proposed. Finally, a lowcost realization of a simplified project of MAN technology was put forward.

Application of attribute recognition theory to evaluation of water safety

ZHANG Longyun,CAO Shengle,YANG Shangyang

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  70-72 .  doi:

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The attribute recognition theory was used to establish the attribute recognition model of water safety assessment, which was applied to Shandong Province. The results show that the assessment accords with the actual situation.

Design and research of cast steel hollow spherical joint with tube

LIN Yan,FEN Yong,

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  77-81 .  doi:

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Cast steel hollow spherical joint with tube is a new type of cast steel joint. Based on design calculation, analysis of finite element method and fullscale experimental study on the joint of Chongqing Olympic stadium, the design procedure and analysis method of the joint were studied. In addition, the space properties are obtained and design suggestions of cast steel hollow spherical joint with tube were presented. The results are meaningful to develop this kind of joint in engineering, which can provide reference for cast steel joint code.

Application of anisotropic damage anchorage modelin a large sized highway landslide reinforcement

ZHANG Qiangyong,XIANG Wen

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  82-85 .  doi:

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Abstract: Highway landslide is a kind of geology hazard which often occurs during highway operation. According to anchorage mechanism of rockbolts, an anisotropic damage anchorage model was established to simulate supporting effect of rockbolts in jointed rockmass. After analyzing the formation reason for a highway landslide, the mechanical model were applied to guide the landslide reinforcement design. Some satisfactory results have been obtained.

The application of 3dcoordinate method in the observation ofdeformation of deep foundation pit

FANG Shuan-she,KONG De-chao,WANG Deng-jie,MENG Ling-xing,

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(5):  86-88 .  doi:

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It is proposed that the 3dcoordinate method should be used as the solution to the problems caused by narrower construction sites where the traditional methods are not applicable. By using total station to survey the angle, distance and elevation at the same time, the differences of coordinate of observation points can be measured, and the horizontal displacements and differential settlement can be attained. This flexible, convenient, economical and efficient method can be used instead of direct leveling when other methods are unsuitable, especially in the narrower field. According to the analysis of the precision and the comparision of the data of settlement measurement, the precision of this method meets the requirement of the observation of deformation.