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15 February 2003, Volume 24 Issue 2 Previous Issue    Next Issue
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Analysis and optimization of ECT sensor using orthogonal experiment with interaction of factors Shao, Fu-Qun (1); Gao, Yan-Li (1); Zhang, Yong-Gao (2); Yang, Jing-Hui (1) 2003, 24 (2):  103-106.  DOI: - Abstract ( 231 )   HTML   PDF (122KB) ( 915 )   The importance of the four parameters, including the radian of electrodes, the permittivity of insulating pipe material, the thickness of pipe wall and the distance between earthed screen and electrodes to the design of ECT(electrical capacitance tomography) sensors was studied by orthogonal experiment with interaction of factors. The four parameters and their interaction have different effect on the quality of images reconstructed by iterative method or multi-linear regression method. The optimum parameters can improve the quality of reconstructed images. References | Related Articles | Metrics

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Vision-based obstacles avoidance for nonholonomic mobile robot Si, Bing-Yu (1); Lu, Zong-Tao (1); Su, Guo-Jun (1); Xu, Xin-He (1) 2003, 24 (2):  107-110.  DOI: - Abstract ( 212 )   HTML   PDF (202KB) ( 519 )   Obstacles avoidance for four-wheel nonholonomic autonomous land vehicle (ALV) was discussed, and an obstacle avoidance method based on circle locus was put forward. The principle of obtaining the information of depth by parallel moving lens was given. The dynamic models of four-wheel nonholonomic ALV were lucubrated. The constraints of dynamics and obstacle avoidance were induced. Obstacles in the road can be layered according to the distances from obstacles to ALV. Thus, one layer of obstacles appear in the vision view of single camera. One sub-goal can be determined according to the configuration of ALV and the locations of obstacles of the layer. The path to the goal of ALV is the iteration of the path to the sub-goal of each layer. ALV follows the arc determined by the initial configuration of ALV and the sub-goal. Knowing the start and the sub-goal reduces the alteration of the running of ALV. References | Related Articles | Metrics

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Robot soccer language system structure and the construction of soccer robot virtual machine Chen, Ning (1); Xu, Xin-He (1) 2003, 24 (2):  111-113.  DOI: - Abstract ( 230 )   HTML   PDF (140KB) ( 515 )   The robot soccer language was illustrated from the view of language system structure. The design concept of the language was described from many aspects, and the language schema was outlined. Virtual machine is the underlying of an language and a important step in the construction of the language. A soccer robot virtual machine (SRVM) was established according to the characteristic of robot soccer game and the vector area rule was brought out. The theoretical foundation for the completeness of Robot Soccer language was provided by the analysis of SRVM ability. References | Related Articles | Metrics

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Real-time IP position control for PMSM based on neural network Li, Hong-Ru (1); Gu, Shu-Sheng (1) 2003, 24 (2):  114-117.  DOI: - Abstract ( 267 )   HTML   PDF (882KB) ( 637 )   A neural-network-based real-time IP position control scheme for permanent magnet synchronous motor PMSM) was proposed. According to the IP control scheme of servo system, a neural-network real-time IP position controller was implemented by the superior approximate performance of neural network. This controller has simple structure, reduces computation amount of weight adjustment and speeds up the computation. A hybrid neural network was applied as identificator of PMSM system, and an algorithm under multi-step predictive index function was used to train neural network on-line. The load torque was acquired from the identificator, and fed forward to compensate the load torque disturbance. The proposed strategy has high-performance dynamic characteristics and strong robustness. References | Related Articles | Metrics

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Popularity-based video stream admission control scheme on VOD Wang, Cui-Rong (1); Gao, Yuan (1) 2003, 24 (2):  118-120.  DOI: - Abstract ( 244 )   HTML   PDF (629KB) ( 619 )   Video streams were classified into hot and cold popularity by the popularity of video stream. An admission scheme was presented, based on the popularity. The EPS multicast and unicast schemes were used for hot and cold video. Network bandwidth for hot and cold video stream was forecasted. The different popularity-based control policies have effect on overall system blocking probability. References | Related Articles | Metrics

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H2 optimal control for descriptor systems based on LMI Yang, Dong-Mei (1); Zhang, Qing-Ling (1); Sha, Cheng-Man (2) 2003, 24 (2):  121-124.  DOI: - Abstract ( 235 )   HTML   PDF (1093KB) ( 721 )   The H2 optimal control for linear time-invariant continuous-time descriptor systems was studied. A state feedback controller was designed. The resulting closed-loop system is admissible and satisfies the H2 suboptimal performance, so that the H2 norm of the closed-loop system is smaller than a given positive number. A sufficient condition that the H2 norm is bounded was presented, and a H2 suboptimal controller was designed by the method of LMI(linear matrix inequality). A numerical example was given to illustrate the design approach. References | Related Articles | Metrics

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Numerical method for eddy current in axis-symmetrical fields Chen, Shao-Lin (1); Liu, Shu-Ying (1) 2003, 24 (2):  125-127.  DOI: - Abstract ( 572 )   HTML   PDF (1300KB) ( 1660 )   Calculating eddy currents in oil-well casing pipe requires numerical methods to solve Bessel equations. The finite difference method for analyzing static fields is used to analyze sinusoidal steady-state field by using phasor method. Differential equations for solving electric field intensity are turned into those for solving magnetic field intensity. This turns the second-class boundary problem into a first class one and makes the solving process more easy. The method is also suitable for other axis-symmetrical fields. References | Related Articles | Metrics

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H∞ robust control of a class of linear systems via hybrid state feedback Nie, Hong (1); Zhao, Jun (1) 2003, 24 (2):  128-131.  DOI: - Abstract ( 206 )   HTML   PDF (165KB) ( 721 )   The H∞ robust stabilization for a class of linear systems was studied via hybrid state feedback strategy. Suppose that there are finite candidate static-slate feedback controllers with known gain matrix, and the systems are unstable using a single controller, in terms of the condition of convex combination and the design of switching laws, a sufficient condition for H∞ robust stabilization of the system was derived through switching among the controllers. The sufficient condition can be given by linear matrix inequality. References | Related Articles | Metrics

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Multi-mode analysis of chaotic motions of a viscoelastic pipe conveying fluid Zou, Guang-Sheng (1); Jin, Ji-Duo (2); Wen, Bang-Chun (1) 2003, 24 (2):  132-135.  DOI: - Abstract ( 220 )   HTML   PDF (260KB) ( 791 )   The stability and chaotic motion of a pipe conveying fluid with both ends fixed, excited by the harmonic motion of its supporting base in a direction normal to the pipe span, were investigated theoretically. The nonlinear differential equation of the system motion was derived by considering the additional axial force due to lateral motion of the pipe. Melnikov method was used to predict the initiation of chaotic motion. The critical value was found to be smaller than that determined by numerical simulation. The motions of both single-mode and two-mode systems were analyzed by numerical simulations The high-order mode of the system can quantitatively complement the displacement of the single-mode system. References | Related Articles | Metrics

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Strategy for selection of cooperated partners during the establishing process of networked extended enterprise Gong, Ya-Dong (1); Zhao, Zhi-Hong (1); Wang, Wan-Shan (1) 2003, 24 (2):  136-139.  DOI: - Abstract ( 244 )   HTML   PDF (1066KB) ( 1049 )   By analyzing factors that decide the selection of cooperated partners, the process and steps of cooperated partners selection were discussed. The relevant evaluation standard was established. In the process of evaluating cooperated partners, AHP algorithm was applied to quantitative analysis for qualitative factors. An integrated strategy was brought forward to quantitative evaluation for the selection of cooperated partners. The taxis method of fuzzy priority was discussed. The fuzzy priority matrix and quantitative standard were established to evaluate cooperated partners. The decision support system for the selection of cooperated partners was introduced. References | Related Articles | Metrics

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Approach to generate the signal of road simulation system Lin, Wen-Qiang (1); Miao, Rui-Ping (1); Wang, Xue-Yi (2); Xie, Li-Yang (1) 2003, 24 (2):  140-143.  DOI: - Abstract ( 187 )   HTML   PDF (186KB) ( 587 )   Taking the road simulation system as a studied topic, a new approach was brought out to generate signal for system identification. A bottom triangle filter was constructed by the system characteristics. The worth of the filter was determined by the statistical attribute of practical signal. The expectative signal was obtained when the normal distributional white noise passed the filter. Using this signal to identify the system can improve the efficiency of system identification. References | Related Articles | Metrics

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Recycle of cadmium from waste nickel-cadmium batteries by chemical leaching Tian, Yan-Wen (1); Li, Jian-Zhong (1); Xu, Cheng-Kun (1); Zhai, Yu-Chun (1) 2003, 24 (2):  144-146.  DOI: - Abstract ( 223 )   HTML   PDF (233KB) ( 767 )   Theoretical analysis of the selectively leaching cadmium from waste Ni-Cd battery was carried out. The relationship between the separation results and the leaching conditions was experimentally investigated. The results show that on the condition of the 1:5 ratio of solid and liquid, at room temperature and pH value 2 of the H2SO4 solution in 2 h leaching, the leaching ratios of cadmium and nickel are 100% and 6.5% respectively. References | Related Articles | Metrics

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Fe-V alloy microstructure of carbide dispersion carburization Wang, Dian-Liang (1); Liu, Yang (1); Hao, Shi-Ming (1); Li, Hong-Xiao (1) 2003, 24 (2):  147-150.  DOI: - Abstract ( 285 )   HTML   PDF (210KB) ( 939 )   The phase of Fe-V alloy means of OM and SEM was investigated. The results show that γ+ V4C3, α+V4C3 and α are distributed with dispersion. The outmost CDC layer dimension is 250 nm deep and carburizing dimension becomes coarsening. Carburizing dimension reaches 2.5μm in the α phase. The main reason is that the carburized grown different rate in the γ and γ phases. Austenitic thickness treated by CDC is proportional to the square root of cementite time. The hardness of Fe-V alloy increases evidently after CDC, and the hardened layer becomes thin with the increase of V content. References | Related Articles | Metrics

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Control capability of the backup roll crowning method on the strip crown Xu, Jian-Zhong (1); Kong, Xiang-Wei (1); Wang, Guo-Dong (1); He, Xiao-Ming (2) 2003, 24 (2):  151-154.  DOI: - Abstract ( 256 )   HTML   PDF (154KB) ( 643 )   A software that can be used to calculate the strip crown influencing ratio was developed by the G-function method. The effective law was studied on the factors such as back-up roll crown, the work roll bending and the specific force acted on the strip crown. The quinary order fit coefficient was derived on the backup roll, the work roll bending and the specific force influencing ratio on the high mill. The control capability was analyzed for the both convention roll method and the backup roll crowning method. The optimal model parameters are presented theoretically when the roll shape is changed on the No.6 and No.7 stands. References | Related Articles | Metrics

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Mathematical model of hot strip laminar cooling system Cai, Xiao-Hui (1); Zhang, Dian-Hua (1); Zhang, Zhong-Ping (2); Wang, Guo-Dong (1) 2003, 24 (2):  155-158.  DOI: - Abstract ( 248 )   HTML   PDF (194KB) ( 1083 )   The mathematical models including air cooling model, water cooling model, feedforward control model, feedback control model and self-learning model of laminar cooling were developed, based on a hot strip plant production line. PID algorithm and Smith predictor controller were studied applying on feedback control. By a practical application test on spot, the models are proved to be simple, effective and of high precision. The coil temperature can be controlled within allowed limitations. References | Related Articles | Metrics

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Numerical analysis of isothermal flow velocity distribution in high temperature air combustion furnace Wang, Li-Jun (1); Cai, Jiu-Ju (1); Zou, Zong-Shu (1); Hao, Yu-Ling (1) 2003, 24 (2):  159-161.  DOI: - Abstract ( 252 )   HTML   PDF (241KB) ( 823 )   The three-dimensional distribution of the velocity value of isothermal flow in high temperature air combustion furnace was numerically simulated with a computer program. Three types of isothermal flow configuration were forecasted under the conditions of three different velocity ratios of fuel to air inject. The flow field properties of the interaction among multi-injections and the recirculating flow were analyzed. It was shown that under certain geometrical parameters, the lower oxygen concentration in recirculating flow can be obtained in the furnace by selecting proper velocity ratio of fuel to air jet in same scalar level. The simulating conclusions are in agreement with the experimental results. References | Related Articles | Metrics

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Discussion of fire hazard assessment in shopping center Zheng, Shuang-Zhong (1); Chang, Yun-Yu (1); Cheng, Yao (1); Chen, Bao-Zhi (1) 2003, 24 (2):  162-165.  DOI: - Abstract ( 267 )   HTML   PDF (1778KB) ( 984 )   Fire risk assessment of a shopping center was carried out by qualitative and quantitative analyses. The material information on the fire protection and building design were collected through first-hand investigation on some shopping centers. Based on the Fire Code On Building Design a qualitative assessment was proceeded. After constituting the fire hazard factors, the fire hazard grade of the shopping center was assessed with fuzzy synthetical method. As an example, a shopping center in Shenyang was analyzed. According to the assessing results the fire hazard grade was obtained and some improving measures were suggested. The assessment was proved to be reliable and successful. References | Related Articles | Metrics

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Optimization design of truss based on neural network Jiang, Shao-Fei (1); Jia, Lian-Guang (2); Yu, Jun (3) 2003, 24 (2):  166-169.  DOI: - Abstract ( 308 )   HTML   PDF (218KB) ( 687 )   The structural optimization technique was described. The basic principle of neural-network-based complex-structure optimization design was introduced. A simulated annealing algorithm was presented. Two examples were given for the optimization design of truss based on neural network to illustrate the efficiency of the given method. This method is more effective and accurate than other optimization methods. References | Related Articles | Metrics

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Assessment and model of environmental literacy and analysis of verification Chen, De-Quan (1); Lou, Cheng-Wu (1) 2003, 24 (2):  170-173.  DOI: - Abstract ( 310 )   HTML   PDF (868KB) ( 1137 )   Combining research achievements on environmental literacy at home and abroad, it is suggested that the concept of environmental literacy should mainly include three aspects including environmental knowledge, environmental action and environmental awareness. Based on this concept and the principles of correlativity, terseness and ability to operate, the construct assessment index system of environmental literacy in three stages and four layers was developed by a mathematical assessment model. A few examples were given to verify the model. The importance of application of modern research methods and communication improvement was discussed in promotion of environmental literacy. References | Related Articles | Metrics

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- - 2003, 24 (2):  174-177.  DOI: - Abstract ( 221 )   HTML   PDF (278KB) ( 604 )   - References | Related Articles | Metrics

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- - 2003, 24 (2):  178-181.  DOI: - Abstract ( 211 )   HTML   PDF (249KB) ( 846 )   - References | Related Articles | Metrics

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- - 2003, 24 (2):  182-185.  DOI: - Abstract ( 503 )   HTML   PDF (143KB) ( 2405 )   - References | Related Articles | Metrics

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- - 2003, 24 (2):  186-189.  DOI: - Abstract ( 185 )   HTML   PDF (158KB) ( 669 )   - References | Related Articles | Metrics

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- - 2003, 24 (2):  190-193.  DOI: - Abstract ( 223 )   HTML   PDF (231KB) ( 1007 )   - References | Related Articles | Metrics

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- - 2003, 24 (2):  194-197.  DOI: - Abstract ( 209 )   HTML   PDF (203KB) ( 819 )   - References | Related Articles | Metrics

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- - 2003, 24 (2):  198-200.  DOI: - Abstract ( 206 )   HTML   PDF (100KB) ( 1072 )   - References | Related Articles | Metrics

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- - 2003, 24 (2):  201-203.  DOI: - Abstract ( 208 )   HTML   PDF (200KB) ( 710 )   - References | Related Articles | Metrics