bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of NC Machine Tools Self-Compensation System Based on FPGA
Authors: Zha Chang Li , Wang Chen Ning , Chen Shi Jun
Published: March 2013

NC machine tools are generally thought to be with a high degree of automation, high precision, high reliability and high efficiency characteristics. But because of the inherent flaws of the machine mechanical structure, such as screw wear, assembly errors or repeated positioning error, the machining accuracy may reduce. Therefore, this paper describes a self-compensating system design FPGA-based NC machine tools. Using Programmable devices(FPGA) and Hardware description language(VHDL) to achieve self-compensation system controller development, Position measurement from absolute encoder in real-timing, Comprehensive building of NC machine tools since compensation control system.
Modeling and State Feedback Control of Three-Phase Active Power Filter on Switched System
Authors: Pei Xing Hua , Cheng Xin Gong , Zong Xi Ju , Dou Wen
Published: March 2013

Three-phase active power filter (APF) is a typical switched affine system for the action of the power switch. The conventional method of modeling was based on the linear system theory. In this paper, a novel control procedure for the three-phase APF based on the switched affine system and quadratic stability is proposed. Firstly, the three-phase APF is built as switched affine system model. Based on the sufficient condition for quadratic stability of convex combination, the common Lyapunov function is selected. Then, the switched rules can be defined to assess quadratic stability of the switched system, thus realizing the control of the compensation current and the DC side voltage. Finally, simulation results have good agreement with the theory analysis, and demonstrate the validity of this approach.
Research on Angular Variation for Aeroplane-Assembly Base on State Space Model
Authors: Li Xin , Zhang Zhi Xiong , Shang Jian Zhong , Cao Yu Jun
Published: March 2013

Abstract. Variation modeling is one of the most significant tools for assembly variation analysis. Considering dimension and geometric errors, and part situation errors, the error source that affects assembly accuracy is classified into two types: error of geometric location and orientation, error of geometric form. And unify these different types of error or deviation by the concept of Virtual Fixture. So a rigid assembly state space model is developed for stream of variation analysis in multi-station assembly processes. And an aeroplane-cabin-assembly process is analyzed in this model. The developed methodology outperforms the current simulation based techniques in computation efficiency, the model is validated using Monte Carlo series Simulations.
Research and Application on Nonlinear Control Algorithms Based on Viscous Dampers
Authors: Liu Jian Jun , Zhu Kuan Jun
Published: March 2013

One challenge in the use of semi-active technology is in developing nonlinear control algorithms that are appropriate for implementation in full-scale structures. Based on the basic characteristics of magnetorheological (MR) damper, the structural control algorithms are introduced. The nonlinear control algorithms are systematically reviewed from the aspects including clipped optimal control, LQR control, and Lyapunov stability control. Finally, the existed problem in application and the future developing in research on the structural control algorithms are summarized respectively.
A Voltage Control Algorithm for Multiprocessor System Based on the Lithium Battery Discharge Characteristics
Authors: Zhao Hai Bo , Xu Shen
Published: March 2013

The more and more extensive application of multiprocessor system to mobile devices has been achieved. The battery-aware voltage scaling algorithm for multiprocessor system was addressed in order to minimize the battery capacity consumption. The proposed algorithm generated task schedule by task assignment, discharge judgment and slack allocation. Based on the characteristic that the battery discharge could be divided into linear discharge and nonlinear discharge two phases, the slack was distributed by different manners during different discharge phases. The simulation results show that battery capacity consumption for the algorithm has relations with battery nonlinearity.
Study of a Bidirectional Proportional Electromagnet
Authors: Yuan Yue Feng , Tao Guo Liang , Liu Hao , Ban Wei
Published: March 2013

Aim to fulfill the design requirements of a pneumatic proportional directional valve, a novel bidirectional proportional electromagnet with integrated lineal Hall position sensor was proposed. Magnetic circuit model and finite element model were established separately. Both static force vs. armature stroke characteristic and Hall sensor output vs. armature position were tested on a newly designed test platform. The experimental result shows a good linear magnetic spring characteristic of the proportional electromagnet, which further ensures a unique spool auto reset capability for directional valves. The mass of the armature is considerably reduced, thus it will benefit the overall performance of high speed pneumatic proportional directional valves.
Control System Design of Feeding Conveyer in Tomato Automatic Sorting Assembly Line Based on the LOGO!
Authors: Yin Zhang Tao , Zhang Ruo Yu , Kan Za , Jiang Ying Lan , Luo Xiao Ling , Ma Yan Fei , Ding Zhu Qing , Li Shuo
Published: March 2013

To effectively monitor the operation of feeding conveyer in automatic tomato selection assembly line and to avoid loss caused by machine’s breakdown, monitor control system was designed for the production line. The hardware circuit was designed using LOGO！ as the core control device, then the software was development. And two working modes (automatic start and manual start) were assembled in the system. Finally, the system was tested in the tomato automatic sorting assembly line. The results indicate that the system can start the machine quickly and respond immediately to break-down.
Fuzzy Sliding-Mode Control for Quad-Rotor Trajectory Tracking
Authors: Liu Chao , Tang Sheng Jing , Yang Sheng Yi , Guo Jie
Published: March 2013

In order to ensure the quad-rotor can track moving targets or desire trajectory accurately and quickly when face external disturbance, sliding mode control is used to overcome the system uncertainties and external disturbances. A fuzzy controller is introduced to decrease the chattering and improve performance of the system. The simulation considering external disturbance is used to test the performance of the fuzzy sliding mode trajectory tracking controller and the result shows that the fuzzy sliding mode trajectory tracking controller is feasible.
Novel Digital Current Sharing Control Technique on Stand-Alone Photovoltaic Inverter
Authors: Liang Jian Ru , Kang Yong , Shan Hong Tao
Published: March 2013

To share the loads and restrain circumfluence among parallel inverters in Stand- alone photovoltaic system (PV), it is described that a digital current sharing control technique for inverter parallel operation in detail in this paper. After the analysis of circumfluence of paralleled system on distributed-logical-control, characteristic of the power regulation, a novel digital power detection technique is deduced. With measuring and analyzing the instantaneous average current of all inverters and the output current of each inverter, both of the current components are used to control and regulate the amplitude and the phase of the output voltage. The proposed control technique on current sharing in the inverter paralleling system has been verified the good characteristic of restraining circumfluence by the results of the experiment.
The Control and Simulation of Plug-In Parallel Hybrid Electrical City Bus
Authors: Yang Yun Yun , Wu Sen , Cao Zheng Ce
Published: March 2013

Take the Plug-in Parallel Hybrid Electrical Vehicle as research object, matching with the parameter of its power system. Then designs a two—parameter fuzzy control unit for torque split between engine and electric motor. The input parameters are the torque needs of the drive system and the battery State Of Charge. Doing the simulation analysis in the simulation software ADVISOR, the results show that the control strategy has improved the dynamic property and fuel economy of the vehicle effectively.
The Impact of Using Mathematics Principles on the Performance of Chillers
Authors: Jiao Yan Hui
Published: March 2013

In AC industry chilled water storage (CWS) systems are one form of cool thermal storage technology that can be used to time shift the electrical load of the system from the peak day periods to off peak night time periods. In this paper the data for the actual exported and generated electrical energy obtained for the power stations has been used to estimate the electrical energy consumption and the peak electrical load of AC systems. Since the chiller in an air cooled AC system represent more than 75% of the total electrical power consumed by an AC system during the peak demand period, the impact of using CWS systems with alternative operating strategies including partial(load leveling ),partial (demand limiting) and full load has been investigated. In our conclusions we estimate that approximately 45% of the total annual exported electrical energy is consumed solely by AC systems as a result of the very high ambient temperatures. Furthermore, it is estimated AC systems represent about 62% of the peak electrical load. The results demonstrate that CWS can reduce the peak electrical load of a chiller in an air cooled AC system by up to 100% and reduce the nominal chiller size by up to 33% depending up on the operating strategy adopted. This is achieved with only a 4% increase in power consumption of the chiller for all CWS strategies except for full storage where the energy consumption actually decreases by approximately 4%.
An Architecture of the Vehicle Tracking System Based on RFID
Authors: Deng Jian Xin
Published: March 2013

Vehicle tracking plays more important roles in modern transportation and logistics operation. This paper deals with a new approach to track vehicles based on RFID (Radio Frequency Identification) technology. The basic steps of vehicle tracking based on RFID are introduced and a six-layered architecture for the vehicle tracking system integrating databases, RFID tags, RFID readers, data centers, networks and user interface is presented, where the positions of vehicles are attained directly by compared the RFID readers collecting vehicle RFID tags with their position information in the database. It is shown that this vehicle tracking method uses RFID more fully, the architecture with clear levels, adapts to the future technical and practical requirements, and can help fuse more complicated applications like intelligent charging and cargo tracking.
The Application Research on Remote Monitoring and Controlling System in Irrigation Pumping Station
Authors: Xie Shou Yong , Peng He , Bao An Hong , Qiu Heng Lang , Chen Chong
Published: March 2013

The controller is designed with LPC2132. The working state of motor and pump can be judged by detection of the Pump station’s power supply voltage, working current，temperature of the motor and pump, water pressure and so on. In order to protect the motor and pump, the motor should be stopped immediately when they work abnormally, then the abnormal phenomenon will be transferred to the director by remote data and corresponding remedial measures will be taken in time. The system achieves not only remote data transmission but also remote controlling. It has being used in many places, the result shows that the control system can be operated steadily and reliably, so it has a good application prospect and promotion value.
Theoretical Computation and Experimental Analysis of Natural Frequencies of Hot Rolling-Mill Housing
Authors: Ma Wei Jin , Wei Yun Bo , Li Feng Lan , Wang Jun Yuan , Xiong Xiao Yan
Published: March 2013

Three-dimensional digital model of hot rolling-mill housing was built. The natural frequency and vibration mode shape of the first 10 order modes of hot rolling mill housing were calculated using ANSYS software. The vibration mode shape was studied in detail. The striking vibration signal and subsequently the natural frequencies were measured by placing two 3-Dimensional accelerators in the key points of the rolling mill horsing. Theoretical calculations and experimental results verified each other，high agreement was shown between the experimental results and the theoretical results. The first 10 mode frequency all appeared in the experiment signal with low error. The main mode frequency (117.3Hz) of the experimental signal has the lowest error down to 0.07%.
Research and Application of Expert System for Oil-Gas Reservoir Protection Based on FNN
Authors: Yang Li , Wang Tian Shi , Zhang Qi Long , Liu Chuan Zhong , Liu Kai Lun
Published: March 2013

To solve the problem of knowledge expression and reasoning model in expert system, factor neural network theory(FNN) is used in multi-expert system for oil-gas reservior protection.By introducing factor and factor space theory,knowledge expression model based on factor state space is presented.Fuzzy reasoning theory is utilized in the factor neural network to verify the effectiveness of the method and solve the reasoning problem of the expert system.The application of the expert system shows that factor neural network theory is valid in knowledge expression and reasoning model.Our proposed method based on FNN can effectively improve the accuracy of inference.
Design and Verification the Simulation System of UAS Flight Control Considering the Effects of Time Delay
Authors: Yang Sheng Yi , Tang Sheng Jing , Liu Chao , Guo Jie
Published: March 2013

It had not been explored which real-time magnitude can meet the requirement of the simulation object in computer simulation system. Taking time delay into consideration, the influence of time delay on the stability of the low-altitude and low-speed small Unmanned Aircraft Systems (UAS) flight control system had been analyzed and the real-time magnitude of the miniature hardware-in-loop (HIL) simulation system was determined. Then a miniature HIL simulation system of the UAS flight control system was designed to prove the real-time magnitude feasibility. The result shows the real-time magnitude by time delay analysis can meet the requirements of flight control system.
Research and Development in 3d Simulation System of 10kV Distribution Network Live Working
Authors: Fang Ma Ji , Song Li Feng , Fang Qi
Published: March 2013

To promote the process of normalization in distribution network live working. This paper research and development a tree-dimensional simulation training system on 10kV distribution network live working by virtual reality, this system visually reappear operating methods and workflow of distribution network live working by tree-dimensional animation simulation, it is appropriate for training the distribution wire professionals, and satisfy the needs about speedy network construction; meanwhile this paper based on national standard of distribution network live working and distribution network live working practical experience of Guangdong province electric power company, the designed tree-dimensional simulation training system is apply to the specific projects in the city of Dongguan , the projects run well verify this system is feasibility and validity.
Large-Scale Electric Vehicle Operation Monitoring Platform Based on Cloud Computing
Authors: Zhao Ming Yu , Lu Zhi Yuan , Wang Gang , Zhang Wei Guo
Published: March 2013

With the development of electric vehicles in China, the demand on computing ability and storage for large-scale electric vehicle operation monitoring platform is increasing. Value-added technology of grid collaborative and proactive demand forecasting, multi-source data management technology, and storage technology of value-added services platform are new technology for the platform with the help of cloud computing. By using the new technology, the platform can provide powerful computing ability without substantial investment and make sufficient technical preparation for the extensive use of the electric vehicle.
Virtual Reality Applications IMU Wireless Sensors in the Lower Limbs Rehabilitation Training
Authors: Yeh Shih Ching , Chang Shun Min , Hwang Wu Yuin , Liu Wen Kang , Huang Tzu Chuan
Published: March 2013

Prior studies show that self-motions early after a fracture surgery can effectively reduce the tissue viscosity. However, due to the postoperative pain and unawareness of the postoperative limitations, a patient prefers to take medication to alleviate pain while complicated rehabilitation exercises can only be implemented under the limited intervention of a therapist, resulting in the patient's lack of interactive feedback on a daily basis and a failure of self-motions to miss the timing of rehabilitation. Additionally, an assessment for the patient's amount of movements is usually carried out by questioning a caregiver by the medical staff during a clinical interview to organize the patient's self-report because an oral statement is more subjective and difficult to quantify the patient's amount and quality of movements, which may lead to the compiling results that can not be compared or referenced to, and may become a blind spot in the record in the current health care system. This study is intended to develop a lower limb fracture postoperative-guided interactive rehabilitation training system for the hip, knee and ankle joints, and establish a method of motion analysis and a method of motion performance assessment in conjunction with the wireless sensor technology and animation techniques, providing an objective assessment from the caregiver and learning the patient's rehabilitation status with a simple and easy recording means. Additionally, with the design of interactive feedback, the improved postoperative rehabilitations are tried to increase the participant’s interest in self-management of health and facilitate to keep tracking the rehabilitation information. The medical evidences show that a guided rehabilitation system can enhance the patient's motive and willingness to be committed to a rehabilitation training as well as increase Quality and Amount of the exercise activity during the training process.
Analysis on the Construction of the Monorail Hoist Auxiliary Transportation System in Coal Mine
Authors: Gao Feng , Xiao Lin Jing , Ma Hong Gang , Guo Shuai
Published: March 2013

To improve the efficiency of the auxiliary transportation system in the coal mine, the monorail auxiliary transportation system was built with the analysis of monorail’s adaptability and road section, and calculation about locomotive selection. The key link of the system’s popularization and application were proposed. The system provides practical significance to improve environment, enhance efficiency and ensure safety in transportation.
Study on Scene Graph and its Application in Product Design
Authors: An Jun , Fan Jin Song
Published: March 2013

Based on the study of the characteristics of scene graph and OSG, osgART and its application in product design was deeply analyzed. Organizational characteristics of scene graph, node traversal, interaction and update callback method in osgART were studied, and relevant codes were given. By adopting OSG scene graph to organize and manage scene information, the developments of AR applications with osgART can simply programming and increase application running speed. The real-time interactive capabilities of virtual objects with real environment can be enhanced, which meet the requirements of rapidly developing AR application with rich features. At the end of this article, a design review system with above approaches for product design was introduced.
Linear Structure Physical Implementation and Analysis
Authors: Zhao De Cai , Liu Jia Jun
Published: March 2013

The basic linear data structure of linear table data -- analysis of the physical structure of the two kinds of method: the linear order of the table to achieve and chain to achieve. The storage structure of insert operation, delete operation, lookup operation to study computer solutions. Compares and analyzes linear data structure of the physical implementation of the advantages and disadvantages.
The Research on the FDD-LTE System and its Key Technologies
Authors: Yu Cai Xia , Zhang Man , Yang Xiao Bo
Published: March 2013

The paper elaborates OFDM technology and its advantages and disadvantages, analyzes the basic principles on random access preamble sequence design ,and defines and analyzes Zadoff sequences and its excellent characteristics . After that, the paper analyzes the frequency offset exists and ZC sequence cyclic shift for the reasons for the decline of the autocorrelation peak of Zero, as a relative frequency offset .Finally,the paper proposes and emphasizes on the design of random access preamble sequence.
An Effective Ultralightweight RFID Secure Protocol with Mutual Authentication
Authors: Jia Qing Xuan , Wang Xin , Gao Xin , Gao Pan Pan , Zhao Bing
Published: March 2013

Due to the radio transmission nature of RFID, the challenge of security and privacy has seriously hindered the large-scale development of RFID technology. However, low-cost RFID tags have the characteristic of extremely limited resources, traditional security primitives cannot be better applied in RFID system. Hence, Designing an effective ultralightweight security protocol applying to low-cost tag is crucial for the various applications of RFID system. In this paper, we propose an ultralightweight secure protocol with mutual authentication. Without adopting classical cryptographic primitives, the protocol proposed only employs simple bit-wise operations such as xor and module addition. Meanwhile, the protocol can resist various attacks and has features of low computation cost and communication traffic.
Design of Ultrasonic Horn for Soft Magnetic Ferrite De-Burring
Authors: Tang Ting Hao , Zheng Hui Feng , Yu Sang Sang , Lv Jiang Ming
Published: March 2013

In order to clear up the burrs on soft magnetic ferrite without damaging the work-pieces, complex Gauss ultrasonic horns was designed. The complex Gauss horn was consisted of two cylinder sections with a Gauss section in the middle. Its profile and parameters were calculated by the theories. The design was verified by comparing the results of theoretical calculating with the result of finite element analyzing. The shape factor of complex Gauss horn is 47% higher than stepped horn with Cone transition section
A General Group Decision Support System Based on the Outranking Relations Method
Authors: Xu Min Shan , Chen Jian Zhong
Published: March 2013

This study built an outranking relations group decision-making method based on the improved ELECTRE-III method, designed and implemented a general group decision support system. Firstly, expand a new kind method through build the group outranking relations, make it better to build-up group views; following by construct system architecture and detailed design; and finally describe the implementation of the system and the main direction of the future research.
A Novel Frequency Based Chunking for Data Deduplication
Authors: Zhang Yun He , Wang Wei Ling , Yin Ting , Yuan Jiang
Published: March 2013

Invoked by the thought of hierarchical substring caching, we proposed a novel Improved Frequency Based Chunking (called IFBC) algorithm for data de-duplication, based on the FBC algorithm proposed in Frequency Based Chunking for Data De-Duplication. Then we conducted a lot of experiments and proved that the IFBC algorithm has a great improvement on the performance compared with the FBC algorithm.
Design and Application of Network-Aided System in Sports Teaching
Authors: Xiao Bing , Zhang Wei
Published: March 2013

According to the practical features of Sports Teaching, the paper described the computer network technology in the great role of Sports Teaching in detail a systematic needs analysis, design of computer network technology based teaching aids management of sports programs and to achieve. This system overcomes the traditional way of Sports Teaching boring, lack of teaching methods such as a single through the various functions provided by the system, effectively the efficiency of Sports Teaching.
Phonetic Transmission System Design Based on Fiber Optic Communication
Authors: Zhuang Qiu Hui , Fu Xiu Hua , Liu Guo Jun , Wang San Qiang
Published: March 2013

With the coming of information society, the development of optical communication technology is highlighted particularly, modern communication technology has become the most important part of. This paper introduces the prospects of fiber optic communication, principle and technical features. In the system design, detailed introduced the fiber optic communication technology as the core, for voice transmission system in which audio signals are generated, then the road filter, audio amplifier, data acquisition unit circuit design. In this paper including system each composition unit selection as well as the ultimate design method, and make the circuit debugging the system summary.
The Scale-Free Characteristics of the Micro-Blog Community
Authors: Wang Bo , Zhao Meng Jia , Li Sheng
Published: March 2013

The micro-blog community is the complex composed of many nodes. Based on interrelated theory of complex networks, this paper constructs the micro-blog community complex network by taking users as nodes, relationship between users as edges, then analyzes the scale-free features and shows that micro-blog community fits the two main characteristics of scale-free networks. Finally from the aspects of government policies、operators and users, putting forward some suggestions about micro-blog community according to its scale-free characteristics in order to let micro-blog play a better role in society.
The Application of Contingency Theory in the Every Development Stage of Cluster Supply-Chain
Authors: Zhou Shi Ping , Liu Guo Sheng
Published: March 2013

The global economic integration, promoting industrial clusters and supply chains to a more perfect direction, during their development, in order to achieve greater advantage, Industrial clusters and supply chains automatically couple to form cluster supply chain. In this paper, we have made an analysis of the performance measurement system based on the cluster supply chain’s total benefit and the development of the cluster supply chain, and then we have study the focus of every development stage according to contingency theory.
The Practical Stability Analysis of a Type of Electricity Market Model
Authors: Lu Zhan Hui , Wu Xin
Published: March 2013

The theory of practical stability is used to study the electricity market model which has the three supplier and two consumers. Based on the dynamic model of electricity market proposed by Alvarado, uses differential-algebraic equations and eigenvalue techniques from the theoretical to study the practical stability of the electricity markets.
A Novel Planetary Gear Hybrid Powertrain
Authors: Yin Jun , Chen Xin Bo , Shu Tao , Ning Guo Bao
Published: March 2013

A novel planetary gear hybrid powertrain is proposed. It contains mainly nine components: A planetary gear mechanism, an internal combustion engine, two motors, two invertors, a set of battery, a power control unit(PCU) and a differential. To further the verification, the feasibility has been demonstrated by system operations analysis. The proposed hybrid powertrain harmonizes the operation of two motors and an engine. It achieves pure electric driving, hybrid driving and regenerative while braking, improves the fuel economy and benefits from the simple configuration, easy assembling and the flexibility of application.
Study on Improving the Assessment Methodology to the Technological Personnel through Information Network Technology
Authors: Chang Jian Jun , Yang Fan , Shi Lei
Published: March 2013

As the development of the time and the great improvement of the network technology, the online system for professional title assessment based on Web2.0 has played an important role in various aspects such as raising the assessment effect, improving the assessment manner, perfecting the assessment environment and so on. This paper records the practice of Web2.0 used in the assessment of technological personnel on seismology, and is of considerable importance for improving the assessment methodology and establishing a scientific assessment system of the seismological personnel.
Single-Machine Scheduling with Due-Window Assignment and Rate-Modifying-Activities under a Deteriorating Maintenance
Authors: Luo Cheng Xin
Published: March 2013

This paper studies single-machine scheduling problems with a due-window assignment and a rate-modifying activity under a deteriorating maintenance consideration simultaneously. Jobs completed within the due-window incur no penalties, other jobs incur either earliness or tardiness penalties. The maintenance activity can be scheduled immediately after any one of the completed jobs. We assume that once the maintenance activity has been completed, the machine efficiency will be improved and the machine maintenance duration depends on its starting time. The objective is to find the optimal maintenance position as well as the optimal size and location of the due-window, and the sequence of jobs to minimize a cost function based on the window size and window location and the earliness and tardiness of the jobs. We propose a polynomial time algorithm to solve the problem optimally.
Cognitive Study of Geometric Figure in Man-Machine Interface
Authors: Jin Xin Qin , Zhang Jian Yi , Song Dan
Published: March 2013

Graphic elements is the most likely form to accept in people’s visual perception of man-machine interface, different people will have different cognitive graphics understanding. In this paper, the rectangular cylindrical, triangular prism, cylindrical, conical, spherical geometry as a stimulus, and test the reaction time of the subjects, the misuse rate of indicators above the 5 geometries recognized. The outcome: In terms of “press”, rectangular cylindrical, triangular prism, cylindrical is more sensitive than conical; In terms of “pull”, triangular prism, cylindrical is more sensitive than spherical; In terms of “spin”, cylindrical, spherical is more sensitive than rectangular, triangular prism; In terms of “drag”, rectangular cylindrical, triangular prism-shaped is more sensitive than spherical.
Comprehensive Evaluation Method Study of Urban Pavement Ecological Physical Environment (UPEPE)
Authors: Wang Bo
Published: March 2013

The premise that analyzing and studying the factors that affect urban pavement ecological physical environment (UPEPE), UPEPE impact factors are the thermal environment, sound environment, light environment, eco-energy saving design. This paper establishes the evaluation method for UPEPE which is based on fuzzy math. We evaluate the quality of UPEPE comprehensively in this way. Heat, light, sound and other ecological and physical environment effects are very important for creating good quality physical environment in urban pavement. In this paper, according to the impact factors of the UPEPE and using the fuzzy mathematical theory on evaluating the UPEPE comprehensively can reflect the real situation more objectively and accurately. The construction of model is simple and practical. Comprehensive evaluation utilizes the combination of the general public survey and expert evaluation, which benefits to reflect the democratic spirit. It also provides the reference to improve the UPEPE.
Dynamic States Specific Analysis for Belt Conveyor Based on FDM
Authors: Shen Xiao , Wang Qun , Fu Zhou Yu , Bai Shuo Wei , Sun Zhao Yang
Published: March 2013

There are two common research methods on the dynamic states model of belt conveyor in China at present. The mathematical model is built by finite element method then it is solved by numerical method. And the continuous model is built when the belt is treated as elastic body then it is solved by mathematical method. This paper puts forward the establishment of continuous model, the model is solved by FDM and the simulation results are given.
Modeling and Experimental Investigation on Vehicle Active Suspension Electromagnetic Actuator
Authors: Huang Chao Qun , Lai Fei
Published: March 2013

A new type of electromagnetic linear actuator for vehicle active suspension was designed, with the characteristics of large stroke and force and fast response. Combined with the finite element analysis software, the finite element model of the electromagnetic actuator was built up. Based on the simulation results, a prototype of electromagnetic linear actuator with appropriate parameters was developed. And the electromagnetic force test of the actuator was done. By comparison of the finite element simulation results and the experimental data, it shows the corresponding results are consistent, indicating that the design and analysis of the electromagnetic actuator is correct.
Safety Evaluation of A380 Wake Turbulence Separation
Authors: Kong Jian Guo
Published: March 2013

CAAC (Civil Aviation Administration of China) set a standard on A380 wake turbulence separation right after China Southern Airlines brought in Airbus A380 in 2001.This paper considers from the possibility of the latter aircraft wake turbulence influencing the preceding one, which means the wake turbulence risk, makes safety evaluation on the wake turbulence separation standard of the preceding aircraft as A380, and the latter one as heavy type, medium type and light type, based on the safety target level that ICAO (International Civil Aviation Organization) authorized. Each type chooses a typical aircraft to calculate the possibility of influenced by the preceding wake turbulence corresponding with the standard under calm wind. The final result shows that the A380 wake turbulence separation standard setting by CAAC is safe.
Optimization Dressing Method of Amplitude Transformer Based on Finite Element
Authors: Zhao Ming Li , Zhao Bo , Wang Yu Qing
Published: March 2013

The node position of amplitude transformer was determined by the finite element method, and the flange was designed at the nod position for conveniently installation. By the finite element software, the amplitude transformer with flange was optimized and dressed, and its structural parameters were determined. During the actual manufacturing process, it was used impedance analyzer to test its vibration performance, the testing results show that this system vibration performance is good, its resonant frequency is 34.771kHz, anti-resonant frequency is 35.008kHz. The above-mentioned results are very much coincided with the system natural frequency of 34.893kHz which is drew by finite element method. Compared to the traditional dressing this method has many advantages such as convenience, green, environmental protection, low cost and others.
The Analysis and Computing of Heat Storage in Drum Boiler
Authors: Qin Zhi Ming , Liu Ji Zhen , Zhang Luan Ying , Gu Jun Jie , Xu Xiao Gang
Published: March 2013

The heat storage capacity of the drum boiler plays an important role in the Coordination Control System (CCS) of units. The theoretical calculating method of the heat storage capacity is achieved through the mechanism analysis of the risers, drum and over-heater, which solves the problem of the traditional method effectively. The calculating results based on the units design data and the real running data shows that the heat storage capacity of saturation water and metal increases with the pressure decreasing, and the heat storage capacity of steam is same with pressure changes. The heat storage of every medium has different proportion under different load, the heat storage of drum boiler shows different characteristics when the working conditions changes.
Effect of Vacuum Degree on Pinhole of Vacuum Counter-Pressure Casting Molten Aluminum Alloy
Authors: Yan Qing Song , Tu Zi Peng , Lu Gang , Lu Bai Ping , Cai Chang Chun , Zhang Shou Yin
Published: March 2013

During vacuum counter-pressure casting, the vacuumization is an important stage for thin-wall and complicated aluminum alloy castings. Through testing and an analyzing numbers of pinhole and pinhole grade of aluminum alloy samples under different vacuum degree, the effect of vacuum degree on pinhole of vacuum counter- pressure casting molten aluminum alloy is studied. The results indicate vacuum degree has greater effect on pinhole of molten aluminum alloy in vacuumizing process. The smaller vacuum degree is, the more numbers of pinhole of the samples are, and the higher pinhole grade of the samples is. Therefore, when vacuum degree is small, pinhole of molten aluminum alloy appears easily. So the vacuum degree doesn’t choose too small, but for thin-wall and complicated aluminum alloy castings, the vacuum degree doesn’t choose too big either. Appropriate vacuum degree is from 20 KPa to 40 KPa.
Fixture Clamping Force Analysis during Milling Process
Authors: Liu Shao Gang , Jin Qiu
Published: March 2013

This paper presents a analytical method to calculate the minimum clamping force to prevent slippage between the workpiece and spherical-tipped fixture elements during milling process. After the contact deformation between the workpiece and spherical-tipped fixture element is determined, the relationships between the workpiece displacement and the contact deformations are obtained. Based on the static equilibrium equations, these equations are combined and linear equations are obtained to calculate the tangential contact forces between the workpiece and spherical-tipped fixture element. According to the maximum tangential contact force, the minimum clamping force to prevent slippage between the workpiece and spherical-tipped fixture elements is calculated. At last, this method is illustrated with a simulation example.
Surface Topography Characterization in Steel Running-in Process of Dry Sliding Friction
Authors: Zhang Geng Pei , Liu Xiao Jun , Lu Wen Long
Published: March 2013

Running-in is an important and inevitable wear process for machine system, and it plays an indispensable role in extending service life and improving operating performance. Surface topography appears as a significant feature of friction pairs. Therefore, study on modification of surface topography in running-in is crucial to control surface quality and then achieve improvement of machine system. In this paper, to understand the evolution of surface topography in running-in process, steel dry sliding running-in experiments were conducted, and surface topographies in running-in were evaluated with the areal surface evaluation parameters. The results reveal that surface topography evaluation could provide valuable information about wear status of steel running-in process of dry sliding friction, amplitude parameters, area and volume parameters, and hybrid parameters play different and important roles in characterization of surface topography modification in running-in.
Influence of Metal Ions on Biomass Pyrolysis Process
Authors: Xiao Rui Rui , Yang Wei , Yu Guang Suo
Published: March 2013

In order to understand the behavior of biomass pyrolysis, a series of pretreatment biomass were prepared with acid-washing and metal impregnated methods. The effects of metal ions on the yields of tar, char and gas from straw pyrolysis were analyzed in our lab scale fixed-bed reactor. Alkali metal and alkaline earth metal ions affect biomass pyrolysis process and the products heavily. The decreasing metal ions result in declining yield of semi-char and increasing yields of tar and gas. Meanwhile, the pyrolysis temperature corresponding maxium yield of tar increases. There exist marked catalytic effect of potassium, calcium and magnesium cations on the cracking of large molecular weight parts of tar and semi-char formation via recombination reaction of tar. As cause a higher production of char while a decrease of tar and gas production.
Machined Surface Morphology and Generation Mechanism of NbC Particle Reinforced Iron-Base Composites
Authors: Han Li Fa , Xie Chun Xiao , Li Sheng , Tian Jun
Published: March 2013

In this paper, the morphology of machined surface in turning NbC particle reinforced iron-base composites was investigated. It indicates that since the dispersive distribution of reinforcing particles, the machined surface is likely to occur various defects such as tool traces, small pits, discontinuous grooves or micro-cracks. Moreover, the surface generation mechanism was discussed. There exist three different behaviors for reinforcing particles such as brittle breakage, pressed into or flaking off the machined surface during machining. Generally, particles of small diameter are likely to be pressed into the matrix and the machining defects are relatively slight. However, particles of large diameter are likely to break or flake off, which makes surface integrity deteriorate.
Measurement of WC Grain Size in Ultrafine Grained WC-Co Cemented Carbides
Authors: Yuan Yi Gao , Zhang Xiao Xiao , Ding Jian Jun , Ruan Jun
Published: March 2013

Based on the backscattered electron (BSE) images and IMAGEJ image analysis software, the average grain size of WC in ultrafine grained WC-Co cemented carbides was measured. The result shows that BSE images of the polished surface not be etched are suitable for quantitative evaluating the grain size of WC in the ultrafine grained hardmetals. Both linear intercept method and equivalent circle diameter method can be used to accurately measure the grain sizes of WC in ultrafine grained hadmetals by using IMAGEJ software. Measurement results of WC grain sizes coincide with the conclusion of X-ray diffraction method
Preparation Technology of 45steel/60Si2CrA Multilayer Composite Armor Plate
Authors: Liu Jing , Gao Gang , Han Jing Tao , Zhang Yong Jun , Wang Hui Feng
Published: March 2013

Modern composite armor plate is generally composed of faceplate with high hardness and backplate with good toughness. 45 steel/60Si2CrA multilayer composite casting blank with 11 layers, containing 60Si2CrA steel as faceplate and 45 steel as backplate, was fabricated by composite casting. The deformation and heat treatment process of 45steel/60Si2CrA multilayer composite plate were studied. The results show that the interfaces between faceplate and backplate have good combination and the thickness of each layer is basic uniform by reasonable deformation distribution. Yield and tensile strength of the composite plate reaches 956MPa and 1018MPa, the hardness of 45 steel layer and 60Si2CrA layer is 448HV and 536HV respectively after the heat treatment of 860°C water quenching+ high temperature tempering. The mechanical properties meet the qualification of armor plate. The bulletproof test displays that 45 steel/60Si2CrA multilayer composite armor plate can prevent the breakthrough of DAP51B type bullet with the velocity of 500m/s.
The Optimal Radius Calculation and Error Analyses of the “0,π” Phase Pupil Mask
Authors: Lv Qing Hua , Zhu Xiao , Xu Zhong Bao , Zhai Zhong Sheng , Zou Shuang
Published: March 2013

Abstract. A diffraction limited circularly symmetric optical imaging system with “0,π” phase pupil mask was studied, which extended depth of field. The optimal radiuses of the mask in the different amount of defocus are calculated, which in a certain contrast value 0.05 and 0.1, can provide the largest spatial frequency band. On the other hand, the effect of mask manufacturing error is analyzed, and the performance of the simulation imaging system has been verified experimentally that the image system still can obtain the high quality output images even without any post-processing.
Finite Element Analysis and Deformation Homogeneity Optimization of Constrained Groove Pressing
Authors: Wang Zong Shen , Guan Yan Jin , Song Li Bin , Liang Ping
Published: March 2013

Improvement of materials properties induced by constrained groove pressing (CGP) depends largely on deformation homogeneity. Utilizing commercial software DEFORM-3D, a finite element model of multi-pass CGP was established. The distribution and homogeneity evolution of equivalent strain ware analyzed in detail. Based on Taguchi optimization method, the influence of processing parameters (such as groove width, groove angle, friction coefficient and deformation rate) on strain homogeneity was studied numerically and systematically. Within a certain range, the optimum parameter combination is obtained by means of signal to noise ratio analysis. The inhomogeneity factor of the optimum model decreases by about 50 %. The average accumulative equivalent strain is almost twice that of the initial model. Analysis of variance shows that groove angle and groove width are the two most important parameters and effect of friction between dies and sample should not be neglected.
Research on Improved Cycloid Foot Trajectory of Quadruped Robot
Authors: Lu Ying , Zhao Xi Qing , Zhang Zhi Xiong , Shang Jian Zhong , Luo Zi Rong
Published: March 2013

To realize moving forward of quadruped robot by static walking, a cycloid was chose to be foot trajectory to generate a static gait with the inverse kinematics theory. Then the gait was simulated and testified with the dynamics simulation software named RecurDyn. According to the simulation results, the shortage of cycloid foot trajectory was pointed, that the unequal velocity of support feet was the key cause of body lateral shift in the process of simulation. So the cycloid foot trajectory was isokinetic improved and the foot velocity was made sure to be continuous. It was turned out to be that lateral shift phenomenon was eliminated with the improved static gait.
Improved Control Strategy for a Robotic Palletiser
Authors: Dzitac Pavel , Mazid Abdul Md
Published: March 2013

For efficient and higher productivity it is vital that along with the smart production processes the packaging and materials handling processes become faster, more reliable, and operator friendly. This paper presents an upgrade of a control strategy for a large and complex industrial robotic palletiser intended to reduce downtime during palletiser breakdown by allowing faster fault tracking and resolution in the event of a breakdown. The recently modified control strategy has dramatically reduced the palletiser down times by virtue of reduced control complexity and better status feedback that allows maintenance personnel to restore palletiser function faster than was previously possible. This in turn resulted in improved palletiser availability and reliability. Ultimately, it has substantially improved the maintainability to debug and restore palletiser operation, which is extremely beneficial for situations when operator concentration is not at its best, such as during a night shift.
Modeling and Constraints Analysis of Wheeled Mobile Robots
Authors: Zhang Huai Xiang , Dai Guo Jun
Published: March 2013

Wheeled mobile robots’ kinematic constraints and kinematic modeling are presented. Determining how nonholonomic and holonomic constraints limit system mobility in a different way is the main objective. The paper analyzed the relation between controllability of the system and corresponding constraints. It’s shown that constraint properties can be determined by the controllability of the mechanical system. To get this, accessibility distribution is employed. Finally, example to clarify these results is presented. Based on the same procedures, modeling and constraints analysis of other robots can also be acquired.
Virtual Coupling Control Method for Robotic Gait
Authors: Yuan Li Peng , Yahmedi Amur Al , Yuan Li Ming
Published: March 2013

Here, we consider the walking gait patterns. And we presented a hybrid model for a passive 2D walker with knees and point feet. The dynamics of this model were fully derived analytically. We have also proposed virtual coupling control laws. The control strategy is formed by taking into account the features of mechanical energy dissipation and restoration. And we also prove some walking rules maybe true.