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Table of Content

      
    24 February 2006
    Volume 36 Issue 1
    Articles
    Milling force prediction model for highspeed end milling 3Cr2Mo steel
    WANG Su-yu,<\sup>,AI Xing<\sup>,ZHAO Jun<\sup>,LI Zuo-li<\sup>,LIU Zeng-wen<\sup>
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  1-5 .  doi:
    Abstract ( 1467 )   Save
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    Milling force prediction model for highspeed end milling 3Cr2Mo steel
    A variable structure cascade double loop control to the startup process of the heavy truck
    LI Hong-bin,ZHANG Cheng-rui
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  6-10 .  doi:
    Abstract ( 1294 )   Save
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    In order to enhance the smoothly character of the startup process of the heavy truck, a startup control algorithm is proposed based on the analysis of the acceleration fluctuation before and after the lock point, which adopts variable structure cascade double loop control to keep the rotating speed of the engine constant. Considering the nonlinear characteristics of the clutch operating system, the neuron adaptive PID control algorithm is adopted in the acceleration loop to solve the problem of nonlinear control. The experiment results show that acceleration fluctuation before and after the lock point can be restrained by using this algorithm, then the performance of the launch process is improved.
    Intelligent control of the discharge gap during UVEDM
    HU Yu-jing,ZHANG Jian-hua,REN Sheng-feng,BAI Wen-feng
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  11-14 .  doi:
    Abstract ( 1476 )   Save
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    Ultrasonic Vibration Assisted Electric Discharge Machining is a 3C (Complex Plant, Complex Task, Complex Environment) system. The performance of control system is crucial for compound machining. A new FNN controller is developed and the learning algorithm is designed in this paper. The controller can learn it self by using the artificial neural network; the learning result can adjust the controlling rules with the condition changing, which optimize precision and improve the real time characteristic of the system. The correlation model between the machining performance and discharge parameters is established according to the experiment data, which is then applied to control the discharge gap. The experiment results indicate that the machining effect of the new FNN controller is better than that of the traditional machining tool.
    Energy method of local stress and strain fatigue
    XU Nan,CHEN Ju-hua
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  15-18 .  doi:
    Abstract ( 1211 )   Save
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    Analysis of notched specimen of elasticplastic materials by using Neuber rule always lead to over high estimated values of local stress and strain. So conservative initiallife results were usually obtained. Since the coefficient was added to equivalent strain energy density rule on the basis of the plastic deformation item of Neuber rule, the local stress and strain estimation results should be more accurate. According to energy method, elasticplasticity strain energy density of material in the case of cyclic loading was discussed. It was discovered that the plastic strain density was taken into account by the ESED rule, and this was the energy theory basis for the further lower values of local stresses estimated by ESED rule than those obtained by Neuber rule. The above conclusion agreed well with fatigue test.
    Circle locating method based on roundness
    ZHANG Zhi-wen,SONG Shi-jun,
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  19-22 .  doi:
    Abstract ( 1058 )   Save
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    A circle locating method based on roundness is introduced. It is only suitable for standard circle when the threshold of roundness equals to 1. We can set appropriate threshod and locate the position of circle simplely when lens and circle surface are nonparalell because of objective reason by using this method rather than Hough transform. Experiment proves that this method is simple and effective, with good tolerance and robustness.
    Field measurements and analysis of three traffic flow parameters
    LEI Li,SONG-Tao,DONG Li-yun,LIU Chun-zhi
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  23-27 .  doi:
    Abstract ( 1117 )   Save
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    The curves of traffic flow parameters describing the traffic macroscopic characteristics are acquired by conducting a series of field measurements on several sections of the Inner Ring Elevated Road in Shanghai City. The fitting method of nonlinear least square is adopted in data processing. Two speed-density relations are worked out based on the analysis of traffic flow, thus two important critical parameters, namely, the free flow speed and the jamming density are determined. The results show that exponential speed-density relation is suitable for the free flow while the hyperbolic relation for the congested flow.
    Numerical analysis of the airflow motion in cylinder and its influence on the combustion process
    ZHANG Qiang,WANG Zhi-ming
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  28-33 .  doi:
    Abstract ( 1222 )   Save
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    The airflow motion in cylinder and its influence on the combustion process for the natural gas engine were studied through numerical simulation technology. Two combustion systems with different intake ports were simulated. The results of the numerical simulation show that the final momentum near TDC and the center of the vortex flow are influenced by the airflow motion formed during the intake process; the vortex flow can be maintained to TDC, and the main reason for the increase in the turbulence intensity is that the large scale turbulence breaks up into very small scale vortex flow during the terminal compression stroke; it is helpful for the even radial spreading of the flame that the center of the vortex flow in cylinder is close to the cylinder center.
    A new burst assembly algorithm for the FRRenabled OBS networks
    ZHAO Yi,ZHAO Long,ZHANG You-zhi,QI Zhi-feng
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  34-36 .  doi:
    Abstract ( 1296 )   Save
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    In order to meet the future need of realtime and quasirealtime applications, the OBS network design requires short latency time. FRR (forward resource reservation) algorithm is an efficient method to reduce the endtoend data burst delay, but it still has some defections in bandwidth availability. Aiming at the potential problems in the FRR algorithm, PAFRR (precision assembly with forward resource reservation) is proposed. Both theoretical analysis and simulation results demonstrate the advantages of the PAFRR over to the FRR scheme.
    Method of finger-back articular skin texture recognition
    WANG Chang-yu,SONG Shang-ling,SUN Feng-rong,MEI Liang-mo
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  37-40 .  doi:
    Abstract ( 1223 )   Save
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    The hand back image is captured by the device made by ourselves. The articular skin texture is segmented and located by utilizing Canny operator. According to convolution theorem, the fast match algorithm of two articular skin textures is given. The correlation classifier is used to judge whether the two articular skin textures are the same pattern. The experiment results on a small database show that the pattern has good reliability and stability and the identify rate is 95.58 percent as FAR equals to FRR.
    Research of traffic signal optimized control algorithm based on fuzzy logic
    ZANG Li-lin,JIA Lei,LIN Zhong-qin
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  41-45 .  doi:
    Abstract ( 1315 )   Save
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    Presents signal changed phase control algorithm for single intersection based on fuzzy logic and finishes the simulation. The traditional signal control algorithms are concerned about optimization of phases' time and ignore optimization of phases' combination. Take example for four-phase signal control used commonly in real world, research discovers that flexible combination of phases can acquire better control results under the premise of unchanged old order of four phases. Compared with traditional signal fuzzy control method for single intersection, signal changed phase control algorithm possesses flexible phase combination and phase time, it adapts to the real-time change of traffic status in the intersection very well. Simulation is finished based on the typical the four corners and traffic flow in different stages, the result indicates that signal changed phase fuzzy control is prior to traditional fuzzy control for the intersection of uneven traffic flow and it can reduce vehicle delay time greatly. The proposed algorithm is practicable and useful for city intersection signal control.
    Design of fuzzy control for traffic signals of a urban arterial intersection
    ZHAO Jian-yu,JIA Lei,ZHU Wen-xing,YANG Li-cai
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  46-50 .  doi:
    Abstract ( 1329 )   Save
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    Urban arterial roads play an important role in urban traffic, and the control efficiency of the arterial roads intersection will affect the whole traffic of the city. A practical approach to fuzzy control algorithm of urban traffic flow of intersection is described. Based on existing fuzzy logic controller, a green light termination algorithm is added, which can adjust green light extension time to avoid unnecessary extension time. So that the split is optimized by fuzzy logic. A simulation experiment was performed to measure the capability of above fuzzy controller at a four-phase intersection, and the performance was measured with average vehicle delays through the intersection. The simulations show that the results of the fuzzy controller are more satisfactory than fixed time method.
    On stochastic programming model with recourse and chance control
    DING Ran,LI Qi-qiang,GUO Qing-qiang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  51-54 .  doi:
    Abstract ( 1110 )   Save
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    Uncertain problems can be transformed to deterministic ones by a variety of stochastic programming models from different points, and these models can also reflect the attitude of the decision makers to some degree. A new stochastic programming model is proposed, in which some chance control constraints are used to the constraints that could be violated or the corresponding recourse terms to control the chance and the recourse at the same time. A new decomposition algorithm based on GA and SA is also proposed to resolve the model. Finally it is demonstrated by an example that the proposed model can reflect the decision attitude more clearly, and shows the validity of the decomposition algorithm.
    Integrated methods to detect earth fault in DC systems
    JI Tao,SUN Tong-jing,XU Bing-yin,SUN Bo
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  55-59 .  doi:
    Abstract ( 1266 )   Save
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    To solve the difficult problem of fault detection in DC systems, a new method combining leakage current and waveform analysis methods is proposed to identify the branch with earth fault. The leakage current method is used to find fault in single wire. It detects imbalance DC current between positive and negative wires. The waveform analysis method is used to detect fault with insulation reduction in both wires. It injects a low frequency square wave signal to DC system. The insulation reduction of branch is detected by analyzing the relationships of phase and amplitude between fundamental and third harmonic components. The waveform analysis method can also be used in portable fault location instruments. These two methods were integrated to detect the fault perfectly. A distributed insulation monitoring system for substation DC source using LonWorks Fieldbus technology is introduced. Some key techniques, such as selection of the sensor, frequency and amplitude of square signal, reducing injected signal's influence to DC systems and locating fault point exactly are discussed. Experimental tests verify the correctness and feasibility of the proposed method.
    A scenario-based framework for detention basin development
    LI Chuan-qi,WANG Wei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  60-64 .  doi:
    Abstract ( 901 )   Save
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    The paper analysis the use of scenario analysis in detention basin development, using a case study from Haihe Basin. The development process of alternative scenarios is proposed. The analysis focuses on possible future developments in a region that is undergoing major economic and social changes, and where conditions can be best characterized as uncertain. The qualitative scenarios presented in the paper attempt to provide indications of how future development.
    Cusp catastrophe model of concrete gravity dam sliding along the contact surface between dam and foundation
    LIU Jian,LIU Kang,WANG Guang-yue
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  65-68 .  doi:
    Abstract ( 998 )   Save
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    According to characters of concrete gravity dam, a cusp catastrophe model of concrete gravity dam sliding along the contact surface between dam and foundation is established considering strain softening and waterpermeating softening characters of the crack. Sliding mechanism of concrete gravity dam is analyzed. The authors point out that inner properties of the system is the main factor of instability of sliding while the action of outside environment will trigger the catastrophe. By analyzing the model, the critical displacement and force of the system corresponding to the catastrophe are presented.
    Two direction rough decision-making and decision discernment on assistant set
    HU Ming-li,HU Hai-qing
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  69-74 .  doi:
    Abstract ( 1070 )   Save
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    A+s(X*) and A-s(X*) are upper assistant set and lower assistant set of two direction Srough sets respectively. Both A+s(X*) and A-s(X*) are classic sets. The result of fuzzy decisionmaking on As(X*) are composed of results of decisionmaking on A+s(X*) and A-s(X*). The concept of two direction rough decisionmaking is defined in this paper. Judgment theorem and discernment theorem of two direction rough decisionmaking are put forward. The research provides basic theory for solving system decisionmaking problem with dynamic decision factor sets.
    Indiscernible relation in α-rough sets model
    GUAN Yan-yong,HU Hai-qing,WANG Hong-kai
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  75-80 .  doi:
    Abstract ( 905 )   Save
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    Discusses indiscernible relation in αrough sets model. According to the characteristics of qualitative attribute value and uantitative attribute value, and by using of fuzzy cluster analysis approach, it gives two kinds of indiscernible relation which is beneficial to computation and attribute reduction.
    The vertex linear arboricity of the integer distance graph
    ZUO Lian-cui,LIU Jin-guo,LI Chen-shun
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  81-86 .  doi:
    Abstract ( 963 )   Save
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    An integer distance graph is a graph G(D) with the set of all integers Z as vertex set and two vertices u,v∈Z are adjacent if and only if |u-v|∈D where the distance set D is a subset of positive integers. Let Dm,3={1,2,…,m}\{3} for m>3. An upper bound and a lower bound of the vertex linear arboricity of G(Dm,3) are obtained and the values of it is determined for some smaller m.
    The global domain of attraction for a kind of MKdV equations
    LAI Xiang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  87-92 .  doi:
    Abstract ( 912 )   Save
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    The unperturbed system and perturbed system of a kind of Modified Kortewegde Vries (MKdV) equations are considered. Travelling wave method is applied to transform MKdV equations into ordinary differential equations and the forth order Rungekutta method is used to draw their phase portraits. Simple cell mapping(SCM) method is employed to obtain the global and the finite step domain of attraction of MKdV equations. The results are in agreement with their phase portraits.
    Variation knowledge and its filter characters
    LIU Ji-qin,ZHANG Ping,YAN Jian-jun.
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  93-99 .  doi:
    Abstract ( 930 )   Save
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    By using concept of variation rough sets, this paper presents the concept of filter degree of variation knowledge, the characters about granulation and filter of variation knowledge [α/R] are also discussed. We further present the concepts of the granulation degree and filter degree of variation knowledge sets, and analyze the characters about granulation and filter of variation knowledge sets. Using these results, this paper presents filter-separation principle and filter surplus-separation principle of variation knowledge.
    Compensation and simulation for the deadband of the pneumatic proportional valve
    KONG Xiang-zhen,LIU Yan-jun,WANG Yong,ZHAO Xiu-hua
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  99-102 .  doi:
    Abstract ( 1058 )   Save
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    The deadband mechanism of the pneumatic proportional valve and its adverse effects on the system control performance are analyzed. A new compensation method for reducing the friction of the valve is presented. The valve friction that is the main cause of the proportional valve deadband is analyzed, and the valve deadband is compensated by means of neural network control, the adverse effect on the system reliability of the valve is eliminated. System simulation is carried out, and the simulation results show that the control method used for the deadband compensation of the proportional valve is correct and feasible. The presented compensation method has high engineering values.
    Performance analysis of low complexity RAKE receiver in ultra-wideband system
    LI Xiang-yang,YUAN Dong-feng,
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  103-106 .  doi:
    Abstract ( 910 )   Save
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    The performance of UWB communication system, which employs RAKE receiver with maximum ratio combining and equal gain combining, is researched based on the channel models proposed by IEEE 802.15.3a. BER performances are obtained via theoretical analysis and computer simulation. The results show that in dense multipath environment, SRAKE receiver using equal gain combining with low complexity can achieve good performance, so it's fit for UWB communication system.
    Fast eyes location approach based on self-defined feature detection template
    SONG Shang-ling,WANG Chang-yu,MEI Liang-mo
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  107-110 .  doi:
    Abstract ( 866 )   Save
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    Eyes location is important in iris recognition and face recognition. A new approach for the fast real-time eye-pair-location is presented in this paper. The head is taken out of the image by using mathematical morphology. A new template to strength characteristics of face is used. The eyes are located by combing the figure rojection with the characters of face. Experimental result shows that this approach has good accuracy, robust and real-time performance.
    Application of S1D13706 in portable DSP image processing system
    PENG Zhang,WU Xiao-juan,GENG Lei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  111-115 .  doi:
    Abstract ( 1018 )   Save
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    Car-mounted fatigue detection system needs light size, low consumption and portable LCD which can show under complicated illumination terms. In this paper, the operation principle and usage are introduced and an ideal LCD display solution for carmounted fatigue detection system based on DSP is designed. A kind of method that can be used for reference for various kinds of designs of portable image process systems is developed and some valuable experience in the respect of interface design, data transmission and power are offered.
    Event-based control technology for the optimization of subway train's running time
    LU Fei,SONG Mu-min,TIAN Guo-hui
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  116-120 .  doi:
    Abstract ( 948 )   Save
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    After a detailed analysis of the forces in subway train's running, the dynamics mathematical model of subway train is constructed; the eventbased control technology is adopted to solve the controlling of subway, the velocity and acceleration function with respect to the distance are deduced by introducing the action reference variable in the control problem which the object is to minimize the running time. The running scheme can be programmed in realtime, the delay caused by uncertain events is avoided. So it offers a new way for the metro research. The simulation shows that method is effective.
    Research of fingerprint classification combined by binary tree and SVM
    ZHU Xiao-xia,SUN Tong-jing,CHEN Gui-you
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2006, 36(1):  121-124 .  doi:
    Abstract ( 1105 )   Save
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    In order to solve the difficulties existed in fingerprint multiclassification for Support Vector Machine, this paper proposes a novel fingerprint classification method based on binary tree theory. This algorithm uses binary tree to construct the multiclass frame by decomposing the problem into three 2class classification problems, then uses Support Vector Machine optimizing the three hyperplanes. The combination of the two exerted the superiority for 2class classification of SVM over other algorithms completely, the generalization ability has improved greatly and the total accuracy for the new sample is 97.9%. Experimental results show that the fingerprint multiclass problem is divided into three 2class classifier system by using binary tree to construct the multiclass frame, which not only can improve the efficiency of fingerprint classification but also exerts the superiorities of SVM classifier for twoclass classification problem sufficiently.