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Table of Content
24 June 2007
Volume 37 Issue 3
Articles
Articles
Feedback control design for discretetime piecewise affine systems
XU Jun,XIE Li-hua
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 1-10 . doi:
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883
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This paper investigates the design of state feedback and dynamic output feedback stabilizing controllers for discretetime piecewise affine (PWA) systems. The main objective is to derive design methods that will incorporate the partition information of the PWA systems so as to reduce the design conservatism embedded in existing design methods. We first introduce a transformation that converts the feedback control design problem into a bilinear matrix inequality (BMI) problem. Then, two iterative algorithms are proposed to compute the feedback controllers characterized by the BMI. Several simulation examples are given to demonstrate the advantages of the proposed design.
Estimation and control problems and solutions for networked control systems
WANG Wei,ZHANG Huan-shui
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 11-23 . doi:
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555
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Abstract: The elements of networked control systems, such as sensors, actuators and controllers need to exchange information via a digital communication network, and this may induces packet loss and various delays. In this paper, the focus is on the estimation and control problems in networked control systems with packet loss and delay.
Finite-time stability analysis and control design of nonlinear system
XIN Dao-yi,LIU Yun-gang
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 24-30 . doi:
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755
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Abstract: This paper considers the problems of finitetime analysis and control design of nonlinear systems. Based on class K∞ functions, the more general definitions are proposed for kinds of finitetime stabilities, and the sufficient conditions are obtained by Lyapunov functions to ensure the finitetime stability of nonlinear systems. In addition, Sontag's formula is used to develop the design approaches for the finitetime stable, quasicontractively stable and disturbance rejection controllers.
A fuzzy smooth switching multimodel control for nonlinear systems
QIAN Cheng-shan,WU Qing-xian,JIANG Chang-sheng,WANG Yan-qing
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 31-35 . doi:
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618
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To solve the problems in designing a switching controller for smoothing chattering at the time of switching in multimodel systems, a fuzzy smooth switching multimodel control for nonlinear systems is proposed based on T-S models. The proposed strategy can divide the input space into multiple fuzzy regions to blur the boundaries and can facilitate the design of local T-S models and controllers in each region, which guarantees the smoothness of the system state trajectory in the process of switching controllers on the blurred boundaries. The effectiveness of the proposed method is demonstrated by simulation results.
The H
∞
fault estimation for linear discrete timevarying systems
LIU Shuai,ZHONG Mai-ying
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 36-40 . doi:
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535
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The H
∞
fault estimation problem for linear discrete timevarying systems with energybounded disturbance is studied. Using state augment, the fault estimation problem can be formulated as an H
∞
filtering problem. Then the fault estimator can be designed by using an innovative reorganizing approach in the framework of Kalman filtering in Krein space. Finally, a numerical example is given to show the effectiveness of the proposed method.
Design and realization of a heterogeneous robot system based on middleware
ZHOU Feng-yu,SONG Hong-jun,LIU Tao,FENG Guo-rui,MU Long-fang,LI Yi-bin
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 41-45 . doi:
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687
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Based on technique regulation and specific application of C+〖KG-*3]+CORBA middleware, integrated technology of a heterogeneous robot system is studied. Mutual communication is realized between robots with different hardware structures, operating systems, communication protocol and programming language in the distributed context after an isomeric robot mutual operating system has been composed based on CORBA technology with ACE/TAO as a development platform. The system interface is friendly and easily operated with high transplant ability and maintainability, which is easy to update. The successful development of this system offers an optimal technical route for the association of multiisomeric robots.
A two-step self-localization method for mobile robots based on laser information
NIU Jun,LI Yi-bin,SONG Rui
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 46-50 . doi:
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625
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A twostep selflocalization method for mobile robots is presented based on laser information. After preprocessing of the laser scan map, straight lines are extracted by a sequential searching method during the first step and the angle histogram is constructed. Then the rotation angle of the robot can be computed by angle histogram matching. During the second step, the kernel densities of the laser data after histogram matching are estimated and the object function with translation parameter is constructed based on kernel density correlation. The translation vector is solved by the BFGS quasi Newton method. Experimental results demonstrate the effectiveness of this method.
Medical image segmentation of fuzzy Cmeans clustering based on the ant colony algorithm
YANG Li-cai,ZHAO Li-na,WU Xiao-qing
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 51-54 . doi:
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648
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With the fuzzy Cmeans clustering (FCM) algorithm it is difficult to determine the number of clusters in the research of medical image segmentation, which is easy to get into a local optimum. To overcome these shortcomings，a fuzzy Cmeans clustering algorithm is presented for image segmentation based on the ant colony algorithm. First, the overall robustness advantages of the ant colony algorithm are used to get the cluster center and the number of the clusters of the image. Then the results are obtained as the initial cluster centers and the number of clusters of fuzzy Cmeans clustering algorithm. This algorithm overcomes the shortcomings of traditional ones and gets better results. Analysis of the examples is given to prove the effectiveness and practicality of this algorithm.
Offline Chinese signature verification based on the second feature extraction by DWT
TIAN Wei,QIAO Yi-zheng,MA Zhi-qiang
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 55-59 . doi:
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670
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A novel approach to offline Chinese signature verification is proposed based on projection profiles and discrete wavelet transform (DWT). Since the high frequency coefficients of wavelet decomposition represent the better timeresolution features, the reconstructed signals are the second features of the adjusted projection profiles. These features can enhance the signature characteristics, while with an increase of uncertainty to the true signatures. Fuzzy nets are introduced to describe the variation and to employ verification. The average error rate is about 11% obtained from a Chinese signatures database, which is about 6% less than that of the existing research.
Function S-rough set and open-loop control system disturbs recognition
ZHAO Jun-kai,CAI Cheng-wen,SHI Kai-quan,
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 60-63 . doi:
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779
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Based on the dual function S-rough set and system law generation, disturb recognition criteria of the openloop control is given. The structural figure and the concrete realizing procedures of disturb recognition of the open-loop control system are put forward. Finally, the effectiveness of proposed method is shown through an example.
A review of the research and development of biomass energy technology
DONG Yu-ping,WANG Li-peng,DENG Bo,LU Ping,SHEN Shu-yun
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 64-69 . doi:
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589
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Biomass energy is a type of important renewable energy. It is very important for the solution of the energy crisis and the protection of environment. The work introduces the status quo of the research and application of biomass energy at home and abroad, expounds on the main aspects of the research and the existing problems, analyzes the obstacles in the research and exploration of the biomass in China, and some corresponding measures are proposed.
A meshless method using stabilized conforming nodal integration
WANG Jian-ming,HUANG Le-jian
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 70-73 . doi:
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603
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The equivalent integral weak form of the elastic mechanics control equation is formed. Because of the disadvantages of Guass integration and instability of direct nodal integration, the stabilized conforming nodal integration scheme is adopted based on strain smoothing theory, which improves the meshless global weak form of the 2D problem. The integral fields of this scheme, Voronoi diagram, are with grids accompanied with field nodes. Radial basis point interpolation shape function augmented with polynomial terms is selected in order to easily apply the essential boundary conditions. Numerical examples show that the numerical results have good agreement with the analytical ones, and also establish the stability, accuracy, and good robustness of the present method.
Effects of phase-field parameters on dendritic morphology using phase field simulation
LIU Jian,SU Yu-kuo,XUN Guang-an
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 74-77 . doi:
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801
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The growth process of side-branching of dendrites during solidification of pure Ni melt was studied by the phasefield simulation. The phasefield model was modified by coupling both structural fluctuation and energetic fluctuation. The simulation results indicate that with an increase of undercooling, the velocity and radius of the dendritic tip increases, and the sidebranch becomes intense. It is also found that as the level of the structural fluctuation and energetic fluctuation is increased the side-branch become richer, and a morphological transition takes place with dendrite tipsplitting (doubloon formation) resulting in the normal dendrite morphology being replaced by the dendritic‘seaweed’ morphology.
Efficient algorithm with resistance to simple power analysis on Koblitz curves
HANG Guang-qing,KONG Fan-yu,LI Da-xing,
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 78-80 . doi:
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789
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Koblitz curves belong to a special class of binary curves on which the scalar multiplication can be computed very efficiently by the method of width w radixτ NAF expansion (TNAFw). The scalar multiplication using TNAFw is vulnerable to side channel attacks. A new efficient algorithm is proposed against simple power analysis. Its basic idea is to insert dummy operations in the scalar multiplication using TNAFw so as to resist simple power analysis. This algorithm further optimizes computational cost and the precomputation table. Compared with the SPA resistant TNAFw(STNAFw) algorithm, the number of precomputation points is reduced about 50% and its computation time is reduced about 18%～28%.
Dynamic-EIQ-ABC analysis application in distribution center programming
SUN Lei,WU Yao-hua,ZHANG Guannv
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 81-85 . doi:
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Based on the traditional EIQ analysis, dynamicEIQABC analysis application in the area of distribution center's programming is proposed. In addition, use of the DynamicEIQABC analysis method is also put forward in details. Then, the influences of different curve trends on distribution center programming and the type choosing of picking up devices is analyzed, in order to provide an efficient diagnostic method for distribution center running. Simulation analysis and the real running results prove that this method can well satisfy the Stockin/Stockout requests of the distribution center with an economic character and necessary free space for future development.
Roadbed settlement based on the gray theory
ZHAO Zhi-guang,WANG Deng-jie,TIAN Yun-fei
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 86-88 . doi:
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618
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A forecast model is proposed based on the gray theory, which is applied to forecasting the final roadbed settlement deformation on a weak upper foundation roadbed.Based on engineering mathematics, the terminal settlement is given by setting up a gray forecast model. Compared to the observed results, this model shows higher accuracy. It is important and instructive for the roadbed filling of a weak subgrade.
A mult-objective assessment method of the effects of industrial waste-water management
WANG Bai-wei,CAO Sheng-le
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 89-92 . doi:
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495
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Abstract: A multi-objective property assessment of the effects of industrial waste-water management is discussed concerning economy, the environment and management capacity. Four assessment methods: the method of fuzzy elements approaching to an ideal solution, the Blin method, the oscillating value method, and the fuzzy optimization method, are also discussed. An assessment model for industrial waste-water managing effect is built through the concentration of different assessment methods and is used in the towns belonging to Liaocheng City. The results indicate that the mode of industrial waste-water management used in the Dongchanghu Region can be applied in Liaocheng City.
The influence analysis of the semirigid asphalt pavement configuration stress and distortion by interface conditions
YAO Zhan-yong,SHANG Qing-sen,ZHAO Zhi-zhong,JIA Zhao-xia
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 93-99 . doi:
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602
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The finite element method of three-dimension elasticity and plasticity mechanics model is introduced to analyze interlamination contacting conditions and the influence of axle load on road surface and subgrade surface flexure, the distribution of interlamination maximum tensile stress, the maximum friction force and transverse displacement. The important relationship between the interlamination interface conditions and the pavement ensemble performance is discussed. The analysis shows that the interface continuing problem is vital for the easy formation of structural hazards at the early stage of semi-rigid asphalt pavement and generated the water breakage forming interface deterioration. With regard to the depth of the subgrade workspace, the position of the maximum flexuraltensile stress calculating point and the critical load of expressway semirigid asphalt pavement's overload, suggested values are given.
Application of the fuzzy clustering iterative model to the evalution of water resource carrying capacity
XU Yan-sheng,LIU Xing-fang
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 100-104 . doi:
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571
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The fuzzy clustering iterative model is adopted to evaluate the water resource carrying capacity of seventeen regions in Shandong Province. The ranking feature value of each region is obtained through the fuzzy recognition method, in order to categorize the water resource carrying capacity into different ranks. Some suggestions are proposed to improve the water resource carrying capacity and the sustainable development of the water resource.
Application of the nonprism total station in the detection of a highway bridge
WANG Xue-ping,WANG Deng-jie,SUN Ying-ming*,DONG Lei
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 105-108 . doi:
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During the construction of a highway bridge, every project entity (pile,pile cap, column) should be checked and accepted promptly after its completion. Based on the experience obtained in recent construction, a new method is proposed to measure the central coordinate by combining the nonprism total station with the mathematical theory of three-point-determining-one-circle, which is simple and practical.
Preparation and evaluation of the electro-catalytic characteristics of novel lead Ti-based dioxide electrodes
LI Shan-ping,HU Zhen,SUN Yi-ming*,ZHEN Bo-ru,ZHANG Qi-lei,CAO Han-lin
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 109-113 . doi:
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Bi (La, Ni)-doped lead dioxide electrodes on Ti substrate were prepared by electro-deposition, and their performances were compared by measurements of the decolored ratio of Acid Bright Yellow 2G. Tests of cyclic voltametry and SEM were used to characterize the Ni-doped and normal lead dioxide electrodes. The results show that the increase of oxygen evolution potential and the optimization of distribution of surface grains contribute to the improvement of the electro-catalytic performance of the Nidoped electrode.
Quality optimization of the multifactor and multi-index product
REN Jing-xi,GENG Jin-hua,GAO Qi-sheng
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 114-117 . doi:
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618
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In order to assess the quality of products, all the quality indexes must be considered synthetically. An optimization model of product quality with multiple indexes is presented. The target of this model is to minimize the sum of the weighted mean square error of all the indexes. The weights are determined by the entropyweight coefficient method. Finally, an example of a formula for rubber confims the validity of the proposed method.
A note on total colorings of planar graphs without 4cycle and adjacent 3cycle
SUN Xiang-yong
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 118-121 . doi:
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571
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Given a graph G, Δ(G) is the maximum degree of G. Planar graphs without cycle of length from 4 to k and any two 3cycle do not have a common vertex. Then the total chromatic number of G is Δ(G)+1 if (Δ,k)∈{(6,4),(5,5),(4,11)}.
Synthesis and performance evaluation of a novel Gemini cationic asphalt emulsifier
SHI Lai-shun,WAN Zhong-yi,WANG Lu-yan,XUE Yu-tao
JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2007, 37(3): 122-126 . doi:
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522
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A new Gemini cationic asphalt emulsifier of bis［5-nonyl-2-((2'-hydroxy3′-triethyl ammonium chloride) propyl-oxy-benzyl)］ methane was synthesized by the reaction of triethylamine, epichlorohydrin, and bis(2-hydroxy-5-nonyl phenyl) methane prepared by nonylphenol and formaldehyde reaction. The effects of synthesis factors on the reaction were investigated. The optimum reaction condition is obtained. The emulsifying effect of the emulsifier on road asphalt was investigated. The result shows that the emulsifying performance is good. The synthesis process of the emulsifier is simple. The middle-setting emulsifier may have a better application in the future.
