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January 30,2017
Volume 10,Issue 2
Pages -
Subject Area:Ferrous Metallurgy,Building Materials,Highway Signs, Signals, Monitoring Project,Electrical Engineering,Electric Traction and Automation,Electric Power System and Automation

Title: Study on multiple response mechanism of disruption in truck appointment service system

Authors: LI Na, WANG Yanqiu
PP: 230-236
Abstract: This paper was to mitigate the effect of frequent disruptions in truck appointment system based on disruption management theory, truck appointment and terminal scheduling method. Disruptions in truck appointment were characterized as summative, persistence and multiplicity. Methods were proposed to measure disruptions of three subjects in truck appointment service system, including environment, trucks and terminal. Five levels response strategies were designed for terminal operators according to the characteristics of terminal operation. The strategy for environment recovery is to reschedule equipment or increase input. Recovery strategy for punctual trucks can reschedule truck service sequence, or changing storage location. And terminal equipment disruption can be improved by location change, equipment rescheduling or input increase. According to the three dimensional scenarios of disruptions measurement on three subjects, multidimensional criteria were set up for strategy choices of disruption response. At last, five performance indicators were proposed to evaluate the strategies, including recovery time of the system, equipment inputs and three disruption measurements of the subjects. As a starting research on disruption response mechanism of truck appointment system, this paper acts as a good insight for future studies.
Keywords: logistics system management; truck appointment; disruption management; multiple response mechanism

Title: Ranking node spreading influence based on degree and K-shell method in innovation diffusion network

Authors: YU Mingliang, HAN Jingti
PP: 224-229
Abstract: Ranking node spreading influence is of significance for innovation diffusion. We argue that the node spreading influence not only depends on not only the local information, but also the location of the node. In this paper, we propose an improved method integrating the node degree and K-shell value to rank the node spreading influence in innovation diffusion. The simulation results demonstrate that the Kendall’s Tau in the novel method, largely improved by 6.80% and 13.61% respectively, comparing with that in the degree and K-shell methods. Furthermore, our method can be used to rank the node spreading influence in large scale network because of its low time complexity.
Keywords: system management theory; node spreading influence; innovation diffusion; degree centrality; K-shell method

Title: Physical modeling research on slag splashing behavior of an 80 t combined converter

Authors: CAO Lingling, WANG Zhou, LIU Qing, LI Nan
PP: 215-223
Abstract: Based on the similarity theory, the slag splashing behavior in an 80 t combined converter was studied by water modeling experiment. The experiment was conducted to investigate the influence of oxygen lance height, oxygen flow rate, density of splashed slag, the holes of oxygen lance, bottom nozzles configuration and bottom gas flow rate on the slag splashing behavior. The results showed that the lance height has a significance influence on the slag splashing behavior at different heights inside the converter, while the splashing flow rate is more conducive to the splashing effect of both the slag line and lower part of the trunnion and the density of the slag influences the parts blowing the furnace cap. Furthermore, through variance analysis, the optimal operating parameters of combined blown converter are obtained as follows: lance height is 960 mm; Gas flow rate of slag splashing is 18 000 Nm3/h: four-nozzle oxygen lance; bottom nozzles configuration is D4 (the bottom blowing elements are arranged on 0.6D and 0.7D with the axis angle of 30° and 60° respectively); and bottom blowing flow rate is 100 Nm3/h.
Keywords: ferrous metallurgy; converter; physical modeling; slag splashing

Title: Leaching of carbothermic reduced titanium-bearing blast furnace slag by acid

Authors: ZHEN Yulan, ZHANG Guohua, ZHOU Guozhi
PP: 206-214
Abstract: The kinetics of the leaching of carbothermic reduced titanium-bearing blast furnace slag from Panzhihua Iron and Steel Company with acid system under the protection of Ar atmosphere pressure was studied. The results show that the temperature and acid concentration have significant influences on leaching of carbothermic reduced titanium-bearing blast furnace slag by acid, kinetic curves of acid leaching were obtained. The experimental datas of leaching indicate that the rate-determining step of acid leaching reaction was interface chemical reaction. The apparent activation energy can be estimated to 23-32 kJ/mol.
Keywords: metallurgical physical chemistry; titanum-bearing blast furnace slag; acid leaching; HCl; kinetics

Title: Influence of creep and saturation degree on the capillary sorptivity and gas permeability of concrete

Authors: XING Bingyuan, ZHOU Chunsheng, WANG Zhendi
PP: 198-205
Abstract: In this paper, the effects of creep deformation and initial water saturation on mass transport properties of micro-cracked concrete materials are investigated. The long-term loading method is employed to prepare concrete specimens of different damage extent, whose mass transport properties are characterized by the gas permeability and capillary sorptivity. From the experimental results, it clearly indicates that the gas permeability and capillary sorptivity of concrete materials will dramatically increase due to the creep deformation caused by sustained loading action. However, the gas permeability and capillary sorptivity measured in unloading state are not significantly different for damaged specimens with various levels of creep deformation. On the other hand, the gas permeability of concrete materials rapidly decreases with the increase of saturation degree. The gas permeability for the concrete material with higher creep deformation is more sensitive to saturation degree. The capillary sorptivity of all concrete specimens with saturation degree of 0.15 is higher than that are initially dried to constant mass. In addition, the capillary sorptivity of concrete materials is very sensitive to initial saturation degree. The capillary sorptivity remarkably decreases with the increase of initial saturation in a manner of high nonlinearity. It is necessary to reasonably consider the obvious influences of loading damage and saturation degree on quantitative durability analysis for concrete materials under service.
Keywords: building materials; gas permeability; surface capillary sorptivity; saturation degree; creep; cracking damage

Title: Discussion on the ventilation and smoke extraction mode in an island platform metro station in Chongqing

Authors: HUANG Renwu, LIU Yongqiang, SUN Xiang, WENG Miaocheng
PP: 193-197
Abstract: A full-scale hot smoke experiment has been conducted in a double-deck island platform station in Chongqing No.6 metro line. When the metro station sets fire, adopting the method of numerical simulation, the smoke flow status and the smoke temperature distribution in the station have been assessed. Meanwhile, the Alpert model has been verified. The best smoke control mode is proposed in order to provide a reference for the operation and design of smoke control systems in metro systems.
Keywords: ventilation and air-condition engineering; ventilation and smoke extraction mode; numerical simulation; metro station; fire scenario

Title: Policies and practices of urban transport planning towards on pedestrian friendly city: Dalian as case study

Authors: LIU Lianlian
PP: 182-192
Abstract: In this paper, the development of improving policies and practices was reviewed on walking traffic in Chinese cities in the last two decades. Then the issues of traffic planning and regulations in related of walking traffic were discussed. At last, walking traffic environment in Dalian, which is one of the pedestrian friendly cities in China was studied. Differences and problems between the traffic regulations and walking traffic infrastructure would be analyzed. In conclusion, with more attention on pedestrian traffic, this study will help the improvement of walking environment in China
Keywords: urban and rural planning methods and theories; urban transport planning; pedestrian friendly city; walk traffic; Dalian

Title: AuxiLiary device for vehicle meeting at the vertical curve road section

Authors: SUN Tao, DU Muqing, YANG Shuqian, LI Ling, LIU Qiao, MA Rong
PP: 174-181
Abstract: In order to eliminate the influences and restrictions on traffic safety of the vision blind area at the vertical curve road and reduce hidden danger, an auxiliary device for vehicle meeting at the vertical curve road section was designed. It uses the laser radar for target identification and positioning. The radar signal is transformed through the information processing system to generate the traffic information. Then the traffic information will be shown on the LED display, so as to help the drivers predict road conditions in the scope of blind area ahead, and furthermore to enable them to make correct and necessary driving decisions in time to prevent serious traffic accidents regardless of fear. Meanwhile, in the power supply module, the city power complementary is used to generate clean energy power, which is economy, environmental protection and energy saving. The device is not only suitable to the vertical curve road, but also can be installed in the place with bad view, such as the road intersection.
Keywords: road sign, signal, monitoring project; traffic safety; device for vehicle meeting; vertical curve road; eliminating vision blind area; laser radar

Title: Drivers’ avoidance collision physiological characteristics under the emergency

Authors: GAO Zhenhai, LI Yang, HU Hongyu, ZHAO Hui, YU Huili, CHEN Chaoyang
PP: 167-173
Abstract: Drivers in the process of driving will inevitably accept secondary task, and attention points of dispersion can lead drivers to an emergency condition which will endanger the safety of life. In this article, we carried on reflect ability with the drivers holding a phone and Wechat voice communication of emergency braking time under the condition of experiment and the change of drivers’ physiological characteristics were analyzed in detail. Eight subjects participated in the simulator test, with the qualified tests speed at 50-70 km/h. Experiments prove that the heart rate, skin electrical signals and respiratory physiology indexes under different stress levels can be characterized for drivers’ mental load state. The results show that mental load rises under two kinds of working conditions of answering task; mental load in Wechat voice communication task is higher than that in mobile phone answering task. Characteristics of various parameters provide certain theoretical basis for the parameter modifications of front collision system.
Keywords: vehicle engineering; emergency conditions; answering phone; physiological signals

Title: New class-E amplifier and resonant wireless power transfer system

Authors: TANG Zhide, YANG Fan, PENG Yiling, XU Yangyang
PP: 158-166
Abstract: Considering the overall system performance of resonant wireless power transfer (WPT) system is bound by the power source, the optimum frequency is proposed as the parameter, and class-E amplifier is selected as the power source of WPT system after comprehensive analysis. Because of parametric errors of elements, the outlet filter of class-E power amplifier and the deriver of resonant WPT system can hardly resonate at the same frequency, which causes the reduction of efficiency of the whole transferring system. The subsystem of resonant WPT system is applied as the filter of class-E power amplifier, which constitutes the class-E power amplifier and WPT fusion system. The new system is characterized by the simplification of circuit and the rise of system efficiency. The fusion system is analyzed theoretically, the main parameters and the computational formulas of system efficiency are deduced, and the computational formulas of parameters of various parts of fusion system are also demonstrated. Besides, the prototype system is designed, made and finally tested. The efficiency of the whole system is 63%, and the transfer power is 3 W at the distance of 0.14 m, and the frequency is 1.5 MHz. Thus it provides a reference for the complete design of miniaturized system.
Keywords: electrical engineering; optimum frequency; class-E power amplifier; wireless power transfer; fusion system; transfer efficiency

Title: Identification of transfer function of permanent magnet synchronous motor based on improved particle swarm optimization algorithm

Authors: TAO Zhiyu, ZHANG Bo, HAO Yuehong, CUI Jiarui, HU Guangda
PP: 149-157
Abstract: In order to improve the accuracy of identification of permanent magnet synchronous motor (PMSM) parameters in engineering applications, a particle swarm optimization (PSO) algorithm with improved fitness function is proposed. Firstly, the transfer function model including current control and space voltage vector modulation is established. Then the multi-frequency velocity sinusoidal signals are injected into the PMSM. The amplitude, frequency and initial phase of the actual velocity curve are fitted by the traditional PSO algorithm. The weight functions at different frequency are constructed according to the fitting results. Then the improved particle swarm optimization (IPSO) algorithm is proposed. The frequency characteristics of the transfer function model at different frequencies are obtained. Finally, the platform is verified by TMS320F2812. The experimental results show that the proposed IPSO algorithm has smaller error values and more stable results than the traditional PSO algorithm in fitting with the sinusoidal signal of the motor speed. The transfer function identified is consistent with both the static and dynamic characteristics of the motor.
Keywords: electrical machines and apparatus; frequency response; particle swarm optimization; Levy method; transfer function

Title: Forced low frequency oscillation of wind-integrated power systems

Authors: LI Cong, LIU Ruiye, ZHANG Wei
PP: 137-148
Abstract: Due to a large number of wind generators integrated to power systems, some new problems for the grid such as the forced low frequency oscillation (LFO) may occur. In order to ensure the safety and stability of Wind-Integrated Power Systems, Analysis and control of the LFO is particularly important. Based on the per-unit value system, this paper established a 7-order model DFIG and analyzed the small signal linear mathematical model of One Machine Infinity Bus (OMIB) containing wind farms under various wind speed, calculated the characteristic root and participation factor, concluded that there are two forced low oscillation modes separately of high and low frequency in the system which are caused by shaft system and pitch angle control system respectively.What's more, this paper put forwar an improved MPPT strategy. Based on discrete model simulation, the validity of the conclusion is verified, which can provide basic theoretical analysis of forced LFO for future measures of prevention and control.
Keywords: power system and automation; wind power generation; 7-order model doubly fed induction generton; per-unit value system; low frequency forced oscillation

Title: EtherCAT master station study based on FPGA

Authors: DONG Bolin, ZHANG Yueying
PP: 131-136
Abstract: This paper puts forward a kind of Ethernet for control automation technology (EtherCAT) master implementation scheme based on field-programmable gate array (FPGA) with soft core Nios II to achieve protocol stack, including application layer, data link layer and the network card drive. The master clock in FPGA achieves common crystal oscillator frequency compensation and enables the primary station to stabilize clock frequency synchronization to the reference clock. Communication and motion control between the master station and the servo drive are achieved. Experimental results show that based on FPGA soft core, EtherCAT master station not only can control the master-slave system with nanosecond synchronization time and realize the task with the communication and control of servo, but also can make full use of the FPGA logic unit, saving hardware resources and all the modules can be implemented in FPGA, offering a compact and efficient solution for realizing the computer numerical control (CNC) technology of high speed, high precision and multi channels.
Keywords: numerical control technology; field-programmable gate array; Ethernet for control automation technology protocol; field bus; open system interconnection reference model

Title: A fault diagnosis method based on data fusion for numerical control machine

Authors: TAN Jiwen, WEN Yan
PP: 123-130
Abstract: Fault diagnosis for numerical control machine is very difficult due to the complexity of the structure and the coupling relationship between subsystems. In order to improve the accuracy and reliability of fault diagnosis for numerical control machine, an intelligent fault diagnosis method based on multi-level data fusion is developed in this paper. The multi-dimensional information system with the external sensors data and the internal parameters of numerical control machine is established to monitor the running state of numerical control machine. Multiple characteristic parameters in time domain, frequency domain and time-frequency domain are extracted from the processed signals to extract the fault information. The sensitive parameter set is obtained by kernel principal component analysis (KPCA) method. Multiple classifiers are enabled respectively and simultaneously to analyze the characteristic parameters quantitatively and diagnose the fault types. Finally, the results of multiple classifiers are fused in the form of global decision fusion by the method of fuzzy comprehensive evaluation. Then the final diagnosis results are obtained. The model has been tested in the bearings fault diagnosis of numerical machine and the results show that the proposed model is effective and versatile.
Keywords: manufacturing automation; multi-sensor; data fusion; numerical control machine; fault diagnosis

Title: Analysis on plane reciprocating sliding friction temperature field

Authors: YOU Tao, GAO Genghu, YU Jianwei
PP: 113-122
Abstract: In order to analyze the change law of plane reciprocating sliding friction heat and temperature field, the methods of experiment and numerical calculation were used. Based on multifunctional friction wear tester, plane reciprocating sliding friction temperature field was measured by infrared thermal imager and thermocouple. Meanwhile, load, rotational speed and real-time friction coefficient were obtained by the experiment, and heat flux density with time and space was also calculated. The calculation of the temperature field was realized by using the heat flux density as moving heat boundary condition. The comparative analysis of the experimental and simulation results shows that distribution of the plane reciprocating sliding friction temperature field is mainly affected by load, rotational speed, friction coefficient. The established three-dimensional finite element model can better reappear plane reciprocating sliding friction temperature field. There is a negative correlation between In order to analyze the change law of plane reciprocating sliding friction heat and temperature field, the methods of experiment and numerical calculation were used. Based on multifunctional friction wear tester, plane reciprocating sliding friction temperature field was measured by infrared thermal imager and thermocouple. Meanwhile, load, rotational speed and real-time friction coefficient were obtained by the experiment, and heat flux density with time and space was also calculated. The calculation of the temperature field was realized by using the heat flux density as moving heat boundary condition. The comparative analysis of the experimental and simulation results shows that distribution of the plane reciprocating sliding friction temperature field is mainly affected by load, rotational speed, friction coefficient. The established three-dimensional finite element model can better reappear plane reciprocating sliding friction temperature field. There is a negative correlation between average relative error of temperature field at steady stage with load (rotational speed) at the same rotational speed (load). Absolute error of temperature field gradually increases first, and then tends to be stable under the same working condition.
Keywords: mechanical friction, wear and lubrication; temperature field; infrared thermal imager; finite element model; error

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