bluuebunny/crossref_metadata_2025 huggingface dataset:
A Framework of Solving Combined Transportation and Scheduling Problem
Authors: Zhou Chang Feng
Published: June 2013

A problem in which a given good has to be delivered from some origins to some destinations by means of a given fleet of trucks at minimum cost is discussed. For the purpose of solution the problem is split into two levels: the decision concerns the planning of trips and the vehicles needed to operate the trips have to be scheduled. The solution approach based on Lagrangean Decomposition is presented.
Analysis of Dynamic Characteristics of Gear Transmission System Based on Wind Turbine Gearbox
Authors: Yang Wen Jun , Yuan Hui Qun , Huang Zhi Min , Yang Li Se
Published: June 2013

Based on gear transmission system of 1.5MW wind turbine, dynamic characteristics are analyzed under the effect of both external and internal incentives. Using lumped parameter method, the dynamic model involving 6 degrees of freedom for every helical gear is established with taking the time-varying mesh stiffness and error into account. The results show that the transmission system is quasi-periodic under the operating speed, and the vibration direction of gear with a large amplitude is obtained. This study can be referred to the engineering applications.
Design and Simulation of the Communication Circuit on Multi Jigging Machines
Authors: Yang Ming Xia , Wang Wei Jie , Qian Wei Guo , Chen Xin Jun , Kong Xiang Hong
Published: June 2013

Squid jigging machine is an important equipment in the oceanic squid jigging fisheries. In order to take centralized control of multi jigging machines, improve manufacturing efficiency, this paper introduce the centralized control circuit between PC and single chip microcomputer for the communication within multi jigging machines by the way of RS-485 bus in detail, and we focus on describing the design of the hardware circuit for the centralized control system. The master is PC while the slave is MCS-51. The communication between them is realized by the MSComm control in VB6.0. It researches practicable ways to improve the reliability of RS-485 bus system, respectively from different aspects such as bus conflict, burst interference, common mode interference and nodes fault and so on. This study provides reference data for the researchers.
Research On Extraction Of Region Of Interest For ID Photo
Authors: Xi Chuan Li , Chen Xiao Rong , Yang Xu
Published: June 2013

Region of interest (ROI) play important roles in image analysis and processing areas. In order to solve the problems of large scale storage and transmission of ID photos, this paper presents an approach to extract the ROI of ID photos. A standard facial training database is established by these extracted images. PCA algorithm extracts facial feature values of the extracted images and applied them to facial recognition. Facial recognition algorithm is efficient to manage these ID photos.
20Clustered Domain Colors and Bag of Words Algorithm Based Image Retrieval
Authors: Tang Lei , Zhou Chang Sheng , Zhang Liang
Published: June 2013

Bag of words algorithm is an efficient object recognition algorithm based on semantic features extraction and expression. It learns the virtues of the text-based search algorithm to make images a range of visual words, extract the semantic characters and carry out the detection and recognition of interesting objects. Bag of words algorithm is extracted from gray images and discard s color information of images. We propose in this paper a method of image retrieval based on clustered domain colors and bag of words algorithm. The results of experiments show that this method can improve the precision of retrieval efficiently.
Motion Simulation of Multi-Gear Pump
Authors: Zhang Jun , Niu Meng Meng , Tang Hong Mei , Li Xian Hua , Tang Chun Ren , Zhao Xian Weng , Cai Qing Yang , Lu Shu Qun
Published: June 2013

Due to the high flow pulsation，the ordinary gear pump has large vibration, noise. A new structure named multi-gear pump was proposed. The model of the pump was established. The motion simulation was given to compare with common gear pump. The simulation analysis show that the pump tooth contact force pulse value is 0.296, which is about 25% lower than the common gear pump. Findings from the paper are supposed to provide a theoretical basis for the following experiments and to improve the life of gear.
High Efficient Depth Video Coding Based on Static Region Skipping
Authors: Tian Tao , Peng Zong Ju , Jiang Gang Yi , Yu Mei , Chen Fen
Published: June 2013

Depth video has attracted great attention recently with the trend of MVD (Multiview plus depth) being the main 3D representation format. In order to improve depth video coding efficiency, we propose a novel depth video coding algorithm based on static region skipping. Firstly, based on the corresponding color video, depth video is segmented into two regions: motion regions and static regions. The blocks in static regions are skipped without encoding. The skipped blocks are predicted from the neighboring depth images. Experimental results show that the proposed algorithm not only saves the bitrate up to 56.83% but also improves virtual view quality and saves the encoding time.
A Multi-Feature Fusion Method for Forward Vehicle Detection with Single Camera
Authors: Li Xing , Guo Xiao Song , Guo Jun Bin
Published: June 2013

Vehicle detection is very important for Advanced Driver Assistance System. This paper focused on improving the performance of vehicle detection system with single camera and proposed a multi-feature fusion method for forward vehicle detection. The shadow and edges of the vehicle are the most important features, so they can be utilized to detect vehicle at daytime. The shadow and edge features were segmented accurately by using histogram analysis method and adaptive dual-threshold method respectively. The initial candidates were generated by combining edge and shadow features, and these initial candidates were further verified using an integrated feature based on the fusion of symmetry, texture and shape matching degree features. The weight of each feature was determined by the Fisher criterion, and the non-vehicle initial candidates were rejected by a threshold. The experimental results show that the proposed method could be adapt to different illumination circumstances robustly and improve the accuracy of forward vehicle detection.
Design and Implementation of Wireless Sensor Network Nodes Based on ANT
Authors: Yang Hao , Wang Cheng Hua , Cui Yi Jun
Published: June 2013

Progress as well as integration of wireless communication technology, computer technology and semiconductor technology, can integrate information such as the perception,acquisition and data processing in a very limited volume [. With the rapid development of wireless technology,wireless sensor networks greatly extends the applications of sensor network and Internet of Things as well as the new challenges to wireless communication technology. We will use STC12LE4052AD microcontroller and ultra-low power radio frequency chip nRF24AP2 embedded ANT protocol stack to complete the development of wireless sensor nodes in this paper.
Error Correction Capability of GPS/INS Integrated Navigation System for Guided Rockets
Authors: Bian Wei Wei , Wang Liang Ming , Ding Chuan Bing , Zhong Yang
Published: June 2013

In order to improve the guidance accuracy of long-range rockets, a GPS/INS integrated navigation method with combination of position, velocity and attitude was applied. The GPS/INS integrated navigation system taking the position and velocity from INS and attitude from GPS as observables was studied. The error model of system was established and the Kalman filter was designed. A 6-DOF trajectory simulation was put forward and the correction capability of the INS measurement error by using GPS attitude measurement information was analyzed. The simulation results verify the feasibility and effectiveness of the integrated navigation method.
Synthesis and SEM Analysis of Ketoprofen-Hidroxipropil-β-Cyclodextrin Microparticles for Medical Applications as Drug-Release System with a High Bioavailability
Authors: Cretan Monica Stamate , Munteanu Corneliu , Gafitanu Eliza , Barbinta Andreea Carmen , Stamate Ciprian
Published: June 2013

Drug-release systems are studied lately for increasing absorption in the body and improve the therapeutic effectiveness is key objective. Whatever form it may take a drug release system: tablet, implant, injectable suspension or transdermal system, the basic unit on which effective therapeutic drug particle. Knowledge of particle size distribution in a disperse system is of great importance in pharmaceutical technology. The size, surface area and volume-surface particle may be relevant to the physical, chemical and pharmacological drug toxicities. Stability and speed of dissolution of ketoprofen are much reduced in pure and coupled with a solubility promoter, enhances the bioavailability and particle size distribution depends. In order to improve absorption properties of ketoprofen were synthesized drug microparticles containing ketoprofen and hydroxypropyl beta cyclodextrin. Drug microparticles were studied by SEM microscopy and the results correlated with solubility properties. It was found that microparticles obtained are more easily soluble than pure ketoprofen and small size increases bioavailability.
Design of ANTI-Collision System for Robotics
Authors: Poppeová Viera , Uríček Juraj , Bulej Vladimír , Havlas Peter
Published: June 2013

This paper deals with the solving of collision detection in area of robotics. Collisions in robotics can cause damaging of robotic device, manipulated objects or in the worst case also the death of human. This is the reason why collision detection and collision avoidance is very important task and nowadays also the modern research is focused on finding of appropriate solving methods and tools. In the paper is described the theoretical introduction, practical solution and also real application.
A Finite Element Analysis in Structural Design of Wall-Troweling Robot
Authors: Han Yu Ming , Guo Mei Jing
Published: June 2013

The troweling of wall space is an essential decorative process and the development of wall-troweling robots, which are expected to release labors from the burdensome pargeting tasks, is growing to be a promising sector in todays architectural industry. In this paper, a static analysis is conducted for the key components of troweling disk and vertical guiderail, based on the proposed virtual prototype of wall-troweling robots. The stress distribution across these components provides a sound basis for the structural design. With the finite element analysis module of SolidWorks package, the paper investigates the modal characteristics of the key components operating under practical conditions. The research effort in this paper is contributive to the design and manufacturing of wall-troweling robots.
Recursive Adaptive Control for Solar Panel Servo System
Authors: Xing Chao , Wang Ling
Published: June 2013

Two typical methods for model reference adaptive control are introduced. By integrating the Narendra adaptive control method and the variable structure model reference adaptive control method, a new variable model reference adaptive recursive control method is presented. The results of simulation computations show that the new method has the merits of the above two methods and is efficient and effective.
Reaserch on an Electronic Control System of CNG/Diesel Dual Fuel Engine
Authors: Lv Xiao Ning , Qin Jiang Tao , Li Jing Bo , Zou Bo Wen , Luo Fu Qiang
Published: June 2013

In order to convert the high pressure common rail system engine to CNG/Diesel dual fuel engine, an electronically controlled system is developed. The system includes a CNG fuel supply system, the CNG electronic control unit (ECU) and its matching harness etc. During starting and idle load conditions, the engine runs under pure diesel mode, when the speed and load reached a certain set point, the diesel ECU reduces the pilot diesel quantity, meanwhile, the CNG ECU increases the natural gas quantity, then the engine runs under dual fuel mode. The engine experiment data show that in different conditions, the highest substitution rate is 90% and the average substitution rate is 83%; the average savings ratio of operation cost per hour is 26%.
Temperature Control System Based on Electronic Boiler
Authors: Xu Guo Sheng
Published: June 2013

Research has been done aimed at the boiler's temperature control system, and available control scheme is put forward. Combining with the output response of control system, simulation research and the control regulation of fuzzy controller are done to analyse, after experiments for many times repeatedly, fuzzy control regulation is ensured. The simulation result indicates that control effect is ideal, which means this scheme is identified as ideal temperature control system scheme.
Flame Stability of Methane/Air Mixture in a Heat-Recirculating-Type Mesoscale Channel with a Bluff-Body
Authors: Cheng Zhe , Wang Wen Jun , Shen Wen Qing , Fan Ai Wu , Liu Wei
Published: June 2013

To extend the stable combustion range of micro-combustor, a heat-recirculating-type planar micro-combustor fitted with a bluff-body was proposed in the present work. Numerical simulation on CH4/air premixed combustion in this combustor was performed and the stable combustion range was determined, which showed that the blow-off limit increases with the equivalence ratio and the lower flammability limit was extended. Effect of the equivalence ratio and inlet velocity on combustion efficiency and maximum temperature were investigated. The numerical results showed that combustion efficiencies were higher than 99%, and the maximum temperatures were larger than the corresponding adiabatic flame temperature due to the excess enthalpy combustion effect. However, flashback emerged when the inlet velocity was too small and the equivalence ratio is relatively high.
Study on PLC Interference Suppression Technique Monitoring System of the Airport Power Supply Equipment
Authors: Wei Xiao Bin , Zhu Yi , Lu Song , Zhang Wei
Published: June 2013

In allusion to the airdrome Electro Magnetic Interference (EMI),researched and designed the software and hardware technique methods on interference suppression for Measurement and control system based on PLC of airdrome power supply equipment.
Increasing the Capacity of Concrete Column with Integrated Permanent Formwork Using Wood-Wool Cement Board
Authors: Ahmad Nursafarina , Ahmad Zakiah , Rahman Azerai Ali , Hamid Hanizah Abdul , Aziz Fauzi Mohd Azrizal
Published: June 2013

Growing construction activities requires increase in construction materials. The conventional method of constructions results in a rise in construction waste. Formwork as a main factor to generate construction waste has been the topic of investigation. The permanent formwork has been introduced with the aim to: promote the construction technology process that put quality, safety and environment issues into account, reduce the cost of workers and reduce the overall time of construction project. At present the permanent formwork available in the market are made from steel, and plastic and the cost is still high. Therefore this study is looking at the potential of commercial wood-wool cement board (WWCB) as permanent formwork. A series of concrete columns were constructed with and without integrated WWCB with different configurations of WWCB as permanent formwork. These columns were subjected to axial load and the compressive strength and failure modes were recorded. The results show that the present of permanent formwork from WWCB improves the compressive strength of the column. With the permanent formwork, the size of concrete column can be reduced and able to support the same load as column without permanent formwork. Therefore this construction method can reduce the overall cost of construction.
Dynamic Analysis of Dam-Break Loss Based on Unascertainty Theory
Authors: Yu Hong Tao
Published: June 2013

As the Water-retaining Structure of reservoir, Earth-Rock Dam was widely used because of a wide accommodation, local material and rapid construction speed .There are 86 thousand dams having been built in our country, 90% of which are earth-rockfill dams. However, the aging and disease of earth-rockfill dams are becoming more and more serious. As time goes by, its security problem gets more and more attention. The risk management of dam is a kind of new concept of safety management which is brought in from abroad. One of the most prominent characteristics is that it is conscious both of its own safety and the effect of downstream, which effectively overcomes the deficiency of today's management mode, and it has practical significance to improve earth-rockfill dams management level , ensuring construction and public safety. The study gives the analysis of the economic developments effect on the dam-break loss, and establishes the dynamic predication evaluation model based on uncertainty theory. The model can effectively reflect the time variant characteristics of dam-break loss, which provides new attempt to dynamic predication of dam-break loss.
Experimental Study on the DPF Regeneration Based on Non-Thermal Plasma Technology
Authors: Shi Yun Xi , Cai Yi Xi , Li Kang Hua , Li Xiao Hua , Chen Ya Yun
Published: June 2013

Diesel particulate filter (DPF) are considered to be the most effective means to reduce particulate emissions, and the key of DPF lies in their regeneration. O3 and O which have strong oxidability can be produced by non-thermal plasma (NTP) reactor. PM can be decomposed by these active substances to generate CO and CO2. The results show that PM deposited in the DPF can be removed by NTP technology without any catalyst and DPF can be completely regenerated at a lower temperature.
Comparison between some Simulation Methods Regarding the Thermal Stress on Disc Brake
Authors: Spulber Catalin , Voloaca Stefan
Published: June 2013

The paper proposes a comparison between two simulation methods of disc brake thermal regime which cause thermal stress. Those methods are the finite element analyses and the thermal image processing using grey level (or the luminosity variation) of disc brake emissivity. The authors consider that the variation of thermal image luminosity, images taken of a disc brake during intensive braking, is similar to one of the finite element analyses modeling the same conditions as the one of the experiment.
Interface Behavior in Functionally Graded Ceramics for the Magnetic Refrigeration: Numerical Modeling
Authors: Jabbari Masoud , Spangenberg Jon , Hattel Jesper
Published: June 2013

The active magnetic regenerator refrigerator is currently the most common magnetic refrigeration device for near room temperature applications, and it is driven by the magnetocaloric effect in the regenerator material. In order to make this efficient, a graded configuration of the magnetocaloric material is needed. Tape casting is a common process in producing functional ceramics, and it has recently been established for producing side-by-side (SBS) functionally graded ceramics (FGCs). The main goal of the present work is to study the multiple material flows in SBS tape casting and analyze the influence of the different material properties, i.e. the density and the viscosity, on the interface between the flows, since this is highly important for the efficiency of the device. The Newtonian flow behavior with relatively high viscosity is assumed for each fluid and used in the simulation with a commercial CFD code (ANSYS FLUENT). The results show that the density change does not affect the interface between the adjacent fluids. The viscosity of the fluids plays the most important role in the behavior of the interface. Moreover, increasing the viscosity difference of the adjacent flows, Δμ, leads to increasing the diffusive region between the two fluids.
Feasibility Analysis of a Novel Ice Slurry Producing System
Authors: Chen Yao , Zhang Xiao Song , Yin Yong Gao
Published: June 2013

Ice slurry is thought to be an ideal material for ice-storage because of its good performance on cold storage and transport. However, the conventional ice slurry producing methods heavily depend on electric power and have their own disadvantages. So, this paper proposed a novel ice slurry producing system which consists of three major cycles: the liquid desiccant deep dehumidification cycle, the evaporative precooling cycle and the evaporative supercooling cycle. Research was made by simulation analyses on each process and the whole system, in order to verify its performance. Results showed that the proposed system can alleviate the burden on electric power and has high ice-producing efficiency.
A Novel Density-Based methods GEP-Cluster Algorithm for Collaborative Filtering
Authors: Cai Hong Guo , Yuan Chang An
Published: June 2013

To further solve the expansion performance problems of collaborative filtering technology. Firstly, form a few better center areas by using density partition and numerical distance between objects. Then, use the gene expression programming（GEP） to find the cluster centers. Propose a cluster algorithm of Density-based methods GEP-Cluster (DGEPC) to solve the nearest neighbor problem. Push the GEP technology for the Personalization Recommendation system.
Numerical Simulation of a Straight-Bladed Vertical-Axis Water Turbine Operating in a 2 m/s Current
Authors: Castelli Marco Raciti , Benini Ernesto
Published: June 2013

The present work proposes a full campaign of simulation of a Darrieus-type Vertical-Axis Water Turbine (VAWaterT) operating in an open flow-field. After describing the computational model and the relative validation procedure, a complete campaign of simulations based on full RANS unsteady calculations is presented for a three-bladed rotor architecture, characterized by a NACA 0025 blade profile. Flow field characteristics are investigated for several values of tip speed ratio and for a constant unperturbed free-stream water velocity of 2 m/s. Finally, the torque coefficient generated from the three blades is determined for each simulated angular velocity, allowing the calculation of the rotor power-curve.
Keywords: Vertical-Axis Water Turbine, hydrokinetic technology, CFD, NACA 0025.
The Research and Application of Association Rules Algorithm
Authors: Zhang Shu Juan , Wang Qing Min
Published: June 2013

Through the research of the association rules mining technology and Apriori algorithm, the defects are found in Apriori algorithm. In view of the deficiencies, an improved algorithm is proposed. The algorithm scans database only once, and efficiently reduces the I/O time. The matrix of frequent itemsets is used to store and reduce the transaction data, which saves the storage space. By comparison of Apriori algorithm and improved algorithm, the results of experiments show that the efficiency of the improved algorithm is increased. Finally, an application example of the association rules is given. The improved algorithm is introduced to book lending deal. The rules among the book-borrowed are discovered and analyzed.
A K-Medoids Clustering Algorithm Based on Particle Swarm Algorithm with Simulated Annealing
Authors: Zhou Hong , Luo Ke
Published: June 2013

Be aimed at the problems that K-medoids algorithm is easy to fall into the local optimal value and basic particle swarm algorithm is easy to fall into the premature convergence, this paper joins the Simulated Annealing (SA) thought and proposes a novel K-medoids clustering algorithm based on Particle swarm optimization algorithm with simulated annealing. The new algorithm combines the quick optimization ability of particle swarm optimization algorithm and the probability of jumping property with SA, and maintains the characteristics that particle swarm algorithm is easy to realize, and improves the ability of the algorithm from local extreme value point. The experimental results show that the algorithm enhances the convergence speed and accuracy of the algorithm, and the clustering effect is better than the original k-medoids algorithm.
PPSim: A Cycle-Accurate Simulator for PowerPC Instruction Set
Authors: Gao Xiao Peng , Guo Ping Yang
Published: June 2013

Simulators play an important part in computer architecture research. As for specific microarchitecture study, which focuses on the accurate behavior of out-of-order scheduling, ALU contention, and function unit management, an over-simplified abstraction is not sufficient to represent modern processor organizations. Thus cycle-accurate simulators are introduced to describe the accurate behavior in target microarchitecture. In cycle-accurate simulators, the timing feature within function units is simulated. This paper presents PPSim, a cycle-accurate PowerPC instruction set simulator, which models the cache, branch prediction, and out of order pipeline in PowerPC microarchitecture.
Design and Implementation of an Active RFID System Based on Bluetooth Low Energy
Authors: Cui Yi Jun , Wang Cheng Hua , Chen Chun Lin
Published: June 2013

Active RFID systems are widely used in modern industries. Typical application of the active RFID system is the identification and the position tracking of warehouse and freight container. Traditional design methods of active RFID system need special RFID readers to read and write the active RFID tags. This paper presents a novel active RFID system that can be easily read by smart phones. This new active RFID system was based on Bluetooth Low Energy. In the system, any device equipped with Bluetooth 4.0 such as iPhone 4S or the android based smart phones can be used as the reader. It was easy to use and costs effective. In the paper, we describe the detailed design of the novel active RFID system and the performance evaluation of the system.
3D Reconstruction of Mining Area Based on Terrestrial Laser Scanner and Calculation of Extraction
Authors: Chen Hang , Ying Zhang , Shao Zhen Feng , Du Zhi Qiang
Published: June 2013

This paper analyzes the characteristics of terrestrial laser scanning technology and it's advantages of surveying and mapping application in mining area. Through the analysis of the specific topographical features of mining area, we design a new method in measurement based on the terrestrial laser scanning technology, and probe into the methods of 3D reconstruction and calculation of extraction. Experiments show that the proposed method can improve the efficiency of surveying and mapping in mining area , the 3D model can be used to monitor the extraction of mining area.
About the Bending Calculus for Circular Tapping Plates, Embedded at the Interior Circumference, with Uniform Load at all the Crown by Transfer-Matrix Method
Authors: Suciu Mihaela
Published: June 2013

This article presents the bending calculus of the circular tapping plates, embedded at the interior circumference, free at the exterior circumference, charged with an uniform vertical load at the all the crown, using the Transfer-Matrix Method. This method had the mathematical bases in the theory of Diracs and Heavisides functions and operators. The circular plates calculus is very important for its applications in the mechanical, robotic, medical, military and aerospace industries. First, we can obtain the state vector for the first ring, the exterior circumferential element and the state vector for the latest ring, the interior circumferential element. After, we can calculate for the values r0<r<R, all the state vectors for all the ring elements of the circular tapping plate by Transfer-Matrix Method. With this method is very easy to program this algorithm for the bending calculus of the circular tapping plates.
Love Wave in an Isotropic Half-Space with a Graded Layer
Authors: Zhang Li Gang , Zhu Hong , Xie Hong Biao , Wang Jian
Published: June 2013

This work addresses the dispersion of Love wave in an isotropic homogeneous elastic half-space covered with a functionally graded layer. First, the general dispersion equations are given. Then, the approximation analytical solutions of displacement, stress and the general dispersion relations of Love wave in both media are derived by the WKBJ approximation method. The solutions are checked against numerical calculations taking an example of functionally graded layer with exponentially varying shear modulus and density along the thickness direction. The dispersion curves obtained show that a cut-off frequency arises in the lowest order vibration model.
Structure Fault Diagnosis of Tower Crane Based on Wavelet Packet Analysis and Support Vector Machines
Authors: Wang Sheng Chun , Shen Rong Sheng , Song Shi Jun , Tian Yan
Published: June 2013

First establish a dynamic model of tower crane in the load lifting process, the lifting load is solved under two work conditions.Then establish the FEM(finite element analysis) model of the tower crane under the normal and the damage condition. Get the dynamic displacement of the normal and the damage status under the lifting dynamic load. With wavelet packet decomposition and SVM(Support vector machines) multi-classification algorithm, a multi-fault classifier is constructed, and applied to the fault diagnosis of tower body. The results of the study show that the multi-fault classifier has such advantages as simple algorithm and excellent capability of fault classification, and it can not only diagnose the structural damage status, but also determine the positions of structural damage. This will be a new search on tower crane structural health diagnosis.
Effect of Tool Wear on Quality of Carbon Fiber Reinforced Polymer Laminate during Edge Trimming
Authors: Hamedanianpour Hossein , Chatelain Jean François
Published: June 2013

Polymer matrix composites, particularly carbon fiber reinforced polymers (CFRPs) are widely used in various high technology industries, including aerospace, automotive and wind energy. Normally, when CFRPs are cured to near net shape, finishing operations such as trimming, milling or drilling are used to remove excess materials. The quality of these finishing operations is highly crucial at the level of final assembly. The present research aims to study the effect of cutting tool wear on the resulting quality for the trimming process of high performance CFRP laminates, in the aerospace field. In terms of quality parameters, the study focuses on surface roughness and material integrity (uncut fibers, fiber pull-out, delamination or thermal damage of the matrix), which could jeopardize the mechanical performance of the components. In this study, a 3/8 inch diameter CVD diamond coated carbide tool with six straight flutes was used to trim 24-ply carbon fiber laminates. Cutting speeds ranging from 200 m/min to 400 m/min and feed rates ranging from 1524 mm/min to 4064 mm/min were used in the experiments. The results obtained using a scanning electron microscope (SEM) showed increasing defect rates with increased tool wear. The worst surface integrity, including matrix cracking, fiber pull-out and empty holes, was also observed for plies oriented at -45 degrees. For the surface finish, it was observed that for the studied cutting length ranges, an increase in tool wear resulted in a decrease in surface roughness. Regarding tool wear, a lower rate was observed at lower feed rates and higher cutting speeds, while a higher tool wear rate was observed at intermediate values of our feed rate and cutting speed ranges.
Testing and Analysis for the Centralized Solar Hot Water System Comprehensive Benefit
Authors: Lv Jian , Zhen Shuai , Hu Shi Yang , Ma Xiao Hong , Tang Xiao , Zhang Ying
Published: June 2013

In actual operation the centralized solar hot water system whether can more energy saving, influenced by the collector area design, system operation and control mode , installation accuracy and various factors so on. The analysis in this paper is mainly based on the measured data of the collector area key design parameters such as average daily water use, water temperature, the thermal collection efficiency, water tank and pipeline heat loss and other parameters, as well as the problem found in the test of the construction and operation control , put forward reasonable suggestions for energy saving potential, provide reference for the centralized solar hot water system design and operation in future.
Analysis of Water Friction Loss and Calculation of Rotor 3D Temperature Field for Wet Submersible Motor
Authors: Bao Xiao Hua , Sheng Hai Jun
Published: June 2013

The water friction which is produced in the high-voltage wet submersible motor is much more than that of General motor, and it plays an important role in total consumption of motor. It is difficult to calculate the consumption of water friction. In order to study the high-voltage wet submersible motor water friction loss and temperature field distribution more accurately, this paper take the 6kV-3150kW motor as an example. Based on the Fluid Theory and the Heat Transfer Theory, it establishes the model of the loss of water friction and rotor temperature field. At last, the finite element software is used to analyze the water friction loss of motor and calculate the rotor temperature field .The rationality of the model and the validity of the calculated value are verified by the experimental results, which lay a theoretical foundation for the optimum design of high-voltage wet submersible motor for future application.
Utilization of a DC Brushless Hub Motor as an Alternator in Drive Train of Fuel Efficient Series Hybrid Urban Class Vehicle
Authors: Ali Syed Hassaan , Akhtar Humza , Abdullah Muhammad , Mutahir Muhammad Fazeel , Atif Muhammad
Published: June 2013

While designing the drive train of a Series Hybrid Vehicle fuel efficient vehicle for Shell Eco Marathon Asia 2010, The most important issue was the coupling of Engine and Alternator. The major problem faced while doing so is the compatibility check of alternator with the engine as most locally available alternators were not capable enough to provide 48V at rated power of the engine required for operation of hub motors used in the drive train. In order to overcome this problem, it was decided that Magic Pie DC Brushless Hub motors may be used as improvised alternators, as the regenerative abilities of these motors provide an excellent platform to use it as an alternator and are fairly efficient as well. Many small mechanical modifications and mathematical calculations were done in order to achieve this goal.
The Finite Element Analysis of the Large-Scale Converter Transformer Valve Side of the Electric Field
Authors: Zeng Lin Suo , Wu Zhe
Published: June 2013

This article is based on finite element theory and use ANSYS simulation software to establish electric field calculation model of converter transformer for a ±800kV and make electric field calculation and analysis for valve winding. Converter transformer valve winding contour distribution of electric field have completed in the AC, DC and polarity reversal voltage.
Simulation for the Control Strategy of Three-Phase Boost-Half-Bridge (BHB) DC-DC Converter with Series Voltage Doubler Rectifiers through Three-Phase High Frequency Transformer
Authors: Soomro Amir M. , Khahro Shahnawaz F. , Liao Xiao Zhong
Published: June 2013

This paper presents simulation for the control strategy of three-phase boost-half-bridge (BHB) DC-DC converter with series voltage doubler rectifiers through three-phase high frequency transformer. The control strategy is consisting of three voltage loops. All the three voltage loops are independent of the input side and controls the input and output power balance from the secondary side of the high frequency transformers only. Moreover, the control strategy has been verified for its appropriate operation by simulating the above said configuration for the same turn ratios as well as for the mismatch turn ratios of high frequency transformers. Finally, the satisfactory simulation results for the proposed control strategy are presented.
A Mathematical Model for Close Coil Current Signal Analysis
Authors: Zheng Yu Huang
Published: June 2013

The focus of this paper centers on the analysis of the close coil current signal in circuit breakers (CBs). The characteristic behavior of the close coil is analyzed by the electromagnet control law and a mathematical model is made to describe the dynamic characteristics of the close coil. Results of simulation and experiment are presented in the form of curves of the current of the close coil. The results show that the accuracy of the steady-state and dynamic-state model is satisfactory.
Power Connector Behavior Used in Automotive Applications
Authors: Abdi Rochdi El , Carvou Erwann , Benjemâa Noureddine , Zindine El Mostafa
Published: June 2013

The increase in the number of electronic and electric systems used in the automotive industry necessitates a high level of electric power. To respond to this high electric power demand, it will be necessary to increase the voltage of the batteries and the current and to use new power connectors.
A connector provides a separable interface between two subsystems of an electronic system. The main function of the connector is to transmit a signal or distribute power. For power connectors, heating can lead to an increase in contact resistance and sometimes even to contact surface melting and thus to connector damage.
In this study, vibration tests and heat evolution of a commercial power connector used in the automotive industry was undertaken. The connector includes two spring lamellas on each side and the pin is flat. The pin is introduced between the two lamella springs and is submitted to vibration tests. Using an experimental set-up, the mechanical insertion force, the temperature and the resistance evolution can be measured. To quantify these parameters at the contact zone, a numerical modeling, using the finite element software Ansys, is used to give the change of the insertion force during several insertion-extraction cycles and to solve the differential equations for heat transfer in a transitory mode.
A Modified on-Line Rolling Generation Dispatch Model for Accommodating Large-Scale Wind Power
Authors: Cheng Yin , Li Hai Xin , Liu Jing Wei , Xu Yan Zhe , Sun Guo Qiang , Wei Zhi Nong
Published: June 2013

This paper proposes an improved strategy for on-line rolling generation dispatch. Based on the framework of Lagrange dual relaxation, the problem is transformed and decomposed into primal-problem and N subproblems multipliers and system constrains are satisfied iteratively. The sub-problems are solved by an efficient dynamic programming algorithm without changing the condition of convergence of the framework. Numerical results indicate that the proposed method is fast and efficient in dealing with numerous system constrains.
Study on Propagation Characteristics of EM Wave of PD in Cable Accessories
Authors: Shi Qian , Wang Feng , Fu Ting Ting , Miao Yan
Published: June 2013

PD in cable accessories will inspire EM waves of ultra-high frequency (UHF) at hundreds of MHZ to GHZ. To study the characteristics of EM wave inspired by PD in cable accessories, a three-dimension model of 110kV cable joints is established. Based on the propagation theory of EM waves in coaxial waveguide, finite element method (FEM) is used to analyze the effect of cable joints composite interfaces on UHF signal propagation, and simulation analysis of relations between PD UHF signal's energy distribution, pulse frequency, propagation distance. Simulation results show that the main transmission mode of EM waves is TEM mode in the joints; Energy of EM waves descends rapidly as the PD pulse's frequency increases; Energy of TEM waves descends rapidly with the increasing detection distance. Simulation analysis of UHF signal's propagation characteristics provides the theoretical basis for UHF PD detection in cable accessories.
Study on the Strength Design of Cold Deformation Strengthening Material
Authors: Zhang Tie Shan , Ma Qun Feng
Published: June 2013

Study on Strength design of steel components including residual stress. First, sample with residual stress of shot peening were detected, material properties change with residual stress was analyzed. And problems in the strength design were discussed. On this basis, design criteria for design of static strength and fatigue strength under plane stress state were derivated, the design criteria formula of the unification form is obtained. Finally, examples illustrate the reasonableness of the conclusions and deriving formulas.
Research on Selective Maintenance System for the Marine Power System in Life Cycle
Authors: Xu Xiao Wei , Fan Shi Dong , Zhu Han Hua , He Shou Hui
Published: June 2013

Through analyzing maintenance characteristics of various phases in life cycle, it can be found maintenance is essential in each phase of the system. Therefore, it is important to change the traditional maintenance concept, research on the selective maintenance system in life cycle, instead of considering maintenance only in running phase. Based on the PHM (prognostic and health management) in marine power system, defines optimization maintenance timing of the equipment as objective, and set reliability and economy as evaluation criteria for the maintenance program, this article establishes selective maintenance system for marine power system in life cycle.
A New Fault-Positions Method Based on Interpolation for the Area of Vulnerability to Voltage Sags
Authors: Zhou Shuang Ya , Tao Shun , Xiao Xiang Ning , Luo Chao , Zhen Xiao Chen
Published: June 2013

The area of vulnerability (AOV) of point of common coupling (PCC) can directly reflect the issue of voltage sag caused by faults in power system. In order to calculate the area of vulnerability more accurately and faster, this paper proposes a new fault positions method based on interpolation, which overcomes the blindness of setting fault points. The influence of transformer winding connections on voltage sag is also taken into account. Short-circuit calculation is adopted and transfer matrix representing the transfer law of transformer on voltage sag is deduced firstly. Then, the principle and implementation flow of the new method are presented in detail. Finally, the new method is applied to a regional power system of China, and graphic result of the area of vulnerability is displayed under balanced and unbalanced faults.
A Digital Readout Approach for Differential Capacitive Pressure Sensor
Authors: Shi Xiao Jing , Zheng Chong Wei , Li Han , Jiang Xiao Luo
Published: June 2013

An approach providing a digital output linearly proportional to capacitance difference for capacitive pressure sensor is presented. Based on sigma-delta (ΣΔ) technique, the structure is insensitive to circuit imperfections and component mismatch, permitting the realization of digitized capacitive sensor readout with good accuracy. Analysis shows that a resolution as high as 20 bits is achievable. Simulation results are given to confirm the effectiveness.
Treatment of Low-Strength Wastewater Using an Anaerobic Baffled Reactor at Low Temperature
Authors: She Zong Lian , Fu Xiao Hui , Wu Jian , Shi En , Zhao Lai Li , Guo Liang
Published: June 2013

Treatment of low-strength wastewater of chemical oxygen demand (COD) around 500-1500 mg/L was studied in a 100 L capacity laboratory scale anaerobic baffled reactor (four compartments) at low temperature (17 oC-25 oC). The reactor was operated at influent COD concentrations of 1500, 1000 and 500 mg/L and hydraulic retention times (HRTs) of 24, 12 and 8 h, with the average COD removals changing from 94% to 83%. Compartment-wise studies of various parameters revealed that if the organic loading rate (OLR) was larger, the initial compartment played significant role in the removal of organics. The examinations of scanning electron micrographs (SEM) indicated that the microbial composition of granular sludge were obviously different in four compartments.
A Humidity Measurement Method Based on Comb-Shaped Sensor
Authors: Wang Xuan Zhe , Liu Man Man , Ding Shan Ting , Wang Hao Wei
Published: June 2013

Humidity measurement is an important link of corrosion monitoring in aircrafts and tanks. But the traditional monitor systems are not portable, can’t be real-time monitoring and other shortcomings. In order to solve these problems, a method that using a new sensor -- comb-shaped capacitive sensor in the humidity monitoring has been proposed. This method is based on electrical theory, combined with the processing of circuit, including the generation of the input signal, signal processing, and acquisition of output signal, and finally analyze the data collected to achieve the purpose of the monitoring of humidity.The problem of how to reduce the noise impact, how to simplify the theoretical calculation and other problems are considered and resolved in the design of the system.Compared with the traditional methods, the system based on this method is simple and compact because of its simple on the hardware design and the characteristics of the sensor. The experimental results show that this method has an very important significance in the atmospheric humidity monitoring.
Effect of Tensile Load for Detecting Broken Wires of Parallel Wire Cable Based on Guided Waves
Authors: Wu Bo Ming , Zhang Ji Dong , Zhang Jian Dong , Zhu Cong Ming , Wu Xin Jun , Xu Jiang
Published: June 2013

Condition assessment of cables has gained more attention for the bridge safety. The cable is under tensile load in service. The effect of tensile load for detecting broken wires on parallel wire cable based on guided waves is investigated. The sample cable with broken wires under several levels of tensile load is detected using guided waves based on the magnetostrictive effect. The amplitude of flaw echo increases monotonically with the increasing of tension. The results indicate that the tensile load brings benefit for detecting broken wires in the parallel wire cable.
Experimental Modality Analysis of Ceramic Motorized Spindle
Authors: Zhang Ke , Cai Yu Gao , Zhang Li Xiu , Li Song Hua , Wu Yu Hou
Published: June 2013

The unit of Electric spindle is decided processing speed and precision of the machine key functional components, it determines the development direction of machine tool industry. Use high-performance structure ceramic as electric spindle of spindle, bearing main of rotating parts material, mainly use ceramic material density is small, hardness higher good characteristics, improve the inherent frequency and life axis. Based on the modal analysis theory, the use of the laboratory's hammer excitation 170SD30 models of the ceramic motorized spindle by experimental modal analysis got its first three order inherent frequency and critical speed. Results show that all the ceramic motorized spindle rated frequency far below its first order natural frequency, rated speed far below its first order critical speed, it can effectively avoid resonance region that ensure the process accuracy.
Accelerate Demodulation of Quadrature Amplitude Modulation Using GPU
Authors: Gao Xiao Peng , Wang Si Yuan , Wan Han
Published: June 2013

Quadrature amplitude modulation (QAM) is widely used in communication systems. The traditional QAM demodulation method was implemented in hardware. This paper proposes a demodulation algorithm using GPU. The GPU algorithm is easier to add new features than hardware implementation and reaches 57x speed up compared with the serial algorithm on CPU. It is shown that the QAM demodulation algorithm gained significant performance increase due to the natural parallism of the GPU, using Compute Unified Device Architecture (CUDA).