bluuebunny/crossref_metadata_2025 huggingface dataset:
Chip Morphology in High Speed Precision Turning Process of Hardened Steel GCr15
Authors: Chen Guang Jun , Kong Ling Guo , Gao Qun , Liu Xian Li
Published: September 2013

The main characteristic of hard turning process is easy to produce serrated chip. The chip deformation will impact greatly turning process. It is very important to analysis the chip formation and morphology during precision turning process of hardened steel. The deformation mechanism of serrated chip formation process and its chip morphology of chips produced during precision turning process of the hardened steel GCr15 is studied in hard cutting experiment by the methods such as numerical simulation of two-dimensional finite element analysis of turning, chip cross-sectional microscopic analysis and other methods .High speed precision turning of hardened steel GCr15 produces morphology of continuous chip and serrated chip; Serrated chip has the typical characteristics of the adiabatic shear slip after section such as apical surface of the serrated chip is composed of multilayer rolling dentate shear plane, a single surface of one tooth is not smooth, but no crack. Extrusion grooves is produced from tooth root to tip; Intensive slip line on serrated chip cross-section can be saw by microscopic observation; Fracture surface of the serrated chip presents small tumor tissues. The results show that the reason of hardened GCr15 steel forming serrated chip is periodic adiabatic shear fracture, and the research provides a theoretical reference application of hard turning technology.
Analysis of Characteristics of Movement and Stress in Centerless Superfinishing
Authors: Ma Jian Hui , Guo Peng
Published: September 2013

At present, many of the problems about precision guarantee in centerless sunperfinishing have been solved due to the forming system design in the process of machining and machine tool adjustment. But the precise forming trajectory cannot guarantee the given accuracy. Because uneven movement of the blank in the process of processing owing to the comprehensive influence of motion and force, resulting in, causing changes in metal removal. Now, there has been no the geometry kinematics theory model because lack of the study of the physical reasons for the above phenomenon. So improving accuracy of centerless superfinishing depends on the analysis of the description of movement and stress parameter analysis and equipment parameters adjustment. The stress distribution of the blank in centerless superfinishing process was studied. Force balance equation of it was established. Characteristics of movement of the blank relative to the roll and oil stone was analyzed. Found the friction condition of the blank steady rotating contact with the roller. Some of machine tool equipment adjustment parameters which have great influence on the stability of motion were analyzed. A few methods improved the centerless superfinishing precision by analysis of the movement description and Mechanical processing parameters and Machine tool equipment parameters adjustment were analyzed.
Study of Carbon/Carbon Composite Material Surface Morphology on Ultrasonic Vibration Assisted Milling
Authors: Li Zhang Dong , Zhao Bo , Tong Jing Lin , Duan Peng
Published: September 2013

Carbon/carbon composite is composite material using carbon fiber as reinforcement and carbon as matrix. However, it is the difficult-to-machine material due to some characteristics of the material. The thesis uses ultrasonic milling cutting in order to improve the surface quality. Surface quality becomes better with the improvement of milling speed; surface quality becomes poor with the increases of per tooth feed and cutting depth; Skuincreases after adding ultrasonic, and which explains that the mechanism of ultrasonic milling is different from that of ordinary milling; the increase of Salindicates that surface defects of all kinds reduces in ultrasonic milling and the surface quality is better than that of ordinary milling.
DEFORM-3D Based on Machining Simulation during Metal Milling
Authors: Wang Zhan Li , Hu Yan Juan , Zhu Dan
Published: September 2013

Machining of metals make use of thermal mechanical FEM model. Analysis of nonlinear elastoplastic finite element simulation of milling of 45 # steel material use software of DEFORM-3D that is finite element simulation technology. DEFORM-3D software could be carried out on prediction of the milling force. Through finite element analysis, distribution of stress field, strain field and temperature field of workpiece and tool is obtained under the influence of thermal mechanical. The prediction accuracy of the model was validated experimentally and the obtained numerical and experimental results were found in good agreement.
Design and Implementation of the Stone Elliptical Arc Contour Fitting Algorithm
Authors: Xu Dong Wei , Liu Jian Qun , Wu Xian Fu , Gao Wei Qiang
Published: September 2013

Elliptical arcs have been widely used in stone contours, but the circular saw of the existing stone bridge cutting machine can only cut stone contours which compose of long lines and large radius arcs. The elliptical arc is often fitted by small line segments or small arc segments, and the circular saw cannot be used to process the stone elliptical arc contour. Therefore, a better choice of fitting the elliptical arc in the stone contour is the four-arc fitting algorithm. The traditional four-arc fitting ellipse algorithm can only fit the whole ellipse, in order to fit elliptical arcs, a new fitting algorithm of four-arc fitting elliptical arc is designed. Firstly, identify the stone contour and analyze the elliptical entities section from the DXF file, and divide the elliptical arc curve into several arcs according to the angular relationship. Then adopting the Chebyshev approximation theory of four-arc fitting ellipse, the preliminary fitting of the elliptical arc is performed, and re-fit the start section and end section of the elliptical arc curve, the elliptical arc fitting algorithm is designed. In addition, the maximum value of fitting error has been calculated. Finally, by using the Visual C++ as the developing software, the stone elliptical arc contour fitting algorithm and its processing trajectory simulation are realized. Testing results show that the fitting algorithm can meet the requirements of the circular saw cutting the stone elliptical arc contour.
Automatic Measuring System of Servo Valve Overlap Value Based on Hydraulic Cylinder Switching Oil-Way
Authors: Pan Xu Dong , Wang Guang Lin , Cheng Xin Xin , Lv Hong Chao
Published: September 2013

During the processing of the servo valve spool machining, the overlap of valve spool's each edge should take zero grinding. The grinding processes including spool overlap test and grinding. In this paper, the authors used a new test method, which simulates working condition of servo valve. Hydraulic cylinder is used as the load of servo valve in this test method, and the hydraulic cylinder is in no-load operation. This test method realized the automatic switch of test valve, and it determined the amount of grinding through complete measuring four edges overlap values, furthermore, it realized measuring the total amount of overlap, thus reflect the flow characteristics of a valve. This is a new automatic method for measuring servo valve overlap.
Tool Diffusion Wear Mechanism in High Efficiency Machining Ti6Al4V
Authors: Fan Yi Hang , Hao Zhao Peng , Zheng Min Li , Sun Feng Lian , Niu Suo Liang
Published: September 2013

Ti6Al4V has great affinity with tool material in machining process, which easily leads to tool diffusion wear. Turning experiments were carried out to study cutting temperature and pressure at tool-chip/workpiece. Based on the analysis, a scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectrometer (EDS) was used to analyze tool wear morphology. The affinity of tool and workpiece material using the Ti-W, Ti-Co diagram was also studied to elaborate the diffusion mechanism in this present study. The results shows that the cutting temperature is very high and the temperature increases with the increase of cutting speeds in machining Ti6Al4V. At the contact area, the highest temperature is located in tool rake face near to tool tip. The resilience of workpiece results in serious attrition between tool flank face and the machined surface. The highest pressure is located in tool flank face near to tool tip and the pressure in tool-workpiece interface is much higher than that in tool-chip interface. Under the high cutting temperature and high pressure at tool-chip/workpiece interface, diffusion occurred both at tool rake an flank face in machining Ti6Al4V. Because of the higher temperature at tool rake face diffusion at tool rake face ia more sever than that at tool flank face.
Experimental Study on Electrochemical Abrasive Jet Machining
Authors: Zhang Yong , Zhang Cheng Guang , Dai Hai , Zhu Ying Mou , Ji Yong Chao
Published: September 2013

This paper puts forward a kind of new technology for metal matrix difficult-to-machine materials based on compound energy field. The new technology combine electrochemical jet machining and abrasive jet machining technology, which obtain the high quality of processing surface and greatly improve processing efficiency. Aiming at the new technology, the experimental device of compound machining is established, a large number of process experiments are carried out. The different process parameters are studied for the influence of the machining efficiency, including the machining gap, voltage and jet pressure. The experimental results show that the compound machining can be applied to machining or polishing complex shape parts of metal matrix structure difficult-to-machine materials, so it has widely application prospects.
Production Pulling and Line Feeding Service for Automotive Assembly
Authors: Zheng Yu , He Chang Peng , Xue Li
Published: September 2013

With the large scale automotive production and high flexible assembly line, the OEMs have the new challenge on real-time material replenishment. This paper analyzes the current research and application on material replenishment model, line feeding strategies, and distribution control. A TPL based assembly line feeding service frame is proposed. The mode, calculation logic and service flow of material line feeding are discussed in detail. The application results shows that it can satisfy the assembly line real-time material replenishment requirements, reduce the inventory by the line, and further balance the volatility of production material pulling. And through it, the TPL also expands its value-added service content.
A 3D Engineering Model Retrieval Algorithm Based on Relevance Feedback and Features Combination
Authors: Zhuang Ting , Zhang Xu Tang , Hou Zhen Xiu
Published: September 2013

In order to reuse 3D models and design knowledge efficiently, a number of 3D model retrieval algorithms based on content features of models have been proposed in recent years. Although, the features-based methods have achieved some progress, there are two limitations stilly. The first, single content feature cant be suit for all kinds of 3D models; different features have different strengths and weakness. The second, semantic gap, the semantic of model is independent from low-level characteristics. For those two issues, we present a 3D engineering model retrieval algorithm based on relevance feedback and features combination in this paper. The proposed method takes advantage of multiple features by allying them with weights. In the retrieval process, our method utilizes the Particle Swarm Optimization to update the weights dynamically based on users relevance feedback information in order to narrowing the gap between high-level semantic knowledge and low-level content features. The Experiments, based on publicly available 3D model database Engineering Shape Benchmark (ESB) developed by Purdue University, suggested that the proposed approach has better retrieval ability than traditional ones.
Design for Mechanical Structure of Energy Recovery Damper
Authors: Wu Zhong Yao , Cao Jian Bo , E Shi Ju , Zhao Tian Feng , Chen Chun Xiao , Yang Chu Hang , Bao Hui Huang
Published: September 2013

The traditional cars consume high energy and the energy of vibration is wasted. To solve these problems, a new energy recovery damper was designed by analyzing the principle of vibration energy recovery and the advantages of electroactive acrylic elastomer materials. The three-dimensional modeling was finished for the mechanical structure of the energy recovery damper. As an important constituent part of vehicle suspension system, the energy recovery damper was a nonlinear vibration system which contained elastic force and damping force. The system could generate random vibration with the drive of the sources such as pavement roughness and engine. The vibration energy can be recycled and stored into vehicle battery by the energy recovery damper. The energy could be saved by changing the vibration energy into electric energy. The energy recovery damper has the advantages of simple structure and high efficiency.
The Annealing Effects on the Formability of T2 Copper Foil in Micro Deep Drawing Process by Laser Driven Flyer
Authors: Hu Yang , Liu Hui Xia , Gu Chun Xing , Shen Zong Bao , Wang Xiao
Published: September 2013

In this paper, cold-rolled T2 copper foils with the thickness of 50 were chosen. The foils were annealed at different temperatures, namely, 250°C, 350°C, 450°C, 550°C, respectively. Micro deep drawing experiments on cold-rolled foils and annealed foils by laser driven flyer were achieved in order to investigate annealing effects on the formability of T2 copper foil. The forming depth and material flow uniformity of the workpiece at different conditions were compared and analyzed. The test results showed that: (1) The workpiece of cold rolled foil indicates poor neutral, non-uniform material flow, smaller forming depth, it is due to that the microstructures of cold-rolled foil are fiber organizations, which leads to poor plastic deformation capacity.(2)Annealing can significantly improve the formability of the foil. In the first stage : 250-350°C, recovery and recrystallization occurred in succession in the organization of the raw material, fibrous tissue transformed into equiaxed grains, the residual stress is greatly reduced, thus, the plastic deformation capacity is recovered. The forming depth is also significantly improved, increasing by about twice. In the second stage: 350-450°C, the enhanced formability is relative to the surface layer effect, which is also a reflection of micro-scale effect. This study provided a theoretical and experimental guidance for the practical application of micro deep drawing process by laser driven flyer.
A RecurDyn Based Dynamic Simulation Method for Coupler
Authors: Qu Bao Zhang , Liu Xin , Lu Bi Hong
Published: September 2013

The coupler is used to connect the vehicles, and to transfer and ease longitudinal force and impact force generated by the train running or shunting operation; hence it plays a vital role on vehicle-running safety. The parts of coupler are shaped by casting forming, with some forming error. The process of unlock, full open and lock, (three postures operation) are realized through the motion collision of these components. The forming error will influence the accuracy of coupler motion. However, there is no established theory or techniques to support the research towards the reliability of the motion. By making use of RecurDyn, simulation software for the 13 type coupler, authors carried out multi-body kinematics and dynamics modeling and simulation analysis, and predicted the up-lifter rod max not extract angle when the coupler is unlock with forming error. Meanwhile, authors established a basis process which contains construction and analysis of contact impact mechanism model, simulation geometry modeling, multi-body kinematics dynamics model and simulation analysis. All the efforts lead to one conclusion: the max up-lifter rod not extract angle is 25.5°,when the coupler is unlock. The outcome provides a simulation analysis method for predicting the motion veracity of railway freight car coupler with the features of space mechanism.
Thread Measurement Algorithm Research and Software Development
Authors: Wu Wen Bin , Shao Dong Xiang , Wang Wen Qi , Wang Guang Lin
Published: September 2013

The quality of thread will directly affect the reliability of mechanical system, and the accuracy grade of geometric parameters is the judgment standard to thread quality. Thus, its particularly important to detect the geometric parameters of thread. Its a pretty mature and widely used method to measure thread parameters with universal tool-measuring microscope, but it has many shortcomings, such as tedious operation, low efficiency and the reading error. In view of the above shortcomings, the paper does some simple refits to the existing 19JA universal tool-measuring microscope. In order to improve reading speed and accuracy, the grating rulers are installed on the operating platform in two directions. CCD camera is used to get external thread image instead of human eyes and the eyepiece, which is a non-contact measurement method. A software that based on MFC of VC + + 6.0 is written, which can deal with the thread image and get the thread parameters. The experimental results show that the method can not only effectively improve the measurement efficiency but also guarantee the accuracy of measurement.
A Experiment Study of Rolling Bearing Fault Diagnosis Based on Sensorless Detection Method
Authors: Shi Xian Jiang , Gong Xiu Fang , Guo Hua , Si Jun Shan
Published: September 2013

This paper studied the motor current signature analysis also called sensorless detection. It used to distinguish the feasibility of the motor drive system for rolling bearing fault diagnosis. This method used in fault diagnosis methods of wind power transmission system provides a certain amount of basic research, overcome conventional vibration monitoring high cost and installation of the inconvenience and other shortcomings. A special experiment platform was designed, comparison analyzed the typical current and vibration signal of fault bearing by using signal processing method such as Hilbert transform. A large number of experimental analysis results show that the rolling bearing fault current signal characteristics and the expected failure frequency is roughly the same and basically agrees well with the vibration test results. These prove the feasibility and accuracy of sensorless detection.
Design of the Undulating Fin Propulsor with Rajiform Swimming Mode
Authors: Wang Yang Wei , Tan Jin Bo , Gu Bao Tong , Zhao Dong Biao
Published: September 2013

Fishes have evolved remarkable swimming abilities after years of evolution which inspire scientists and engineers to develop new underwater robots that mimic different kinds of fishes. Stingray is a unique species among median and/or paired fin (MPF) mode fishes which undulates the enlarged pectoral fins while swimming. In this paper, a biomimetic prototype design and a developed undulating fin propulsor that mimics stingrays are presented. Kinematic model of the undulating fin is built. The flexibility of the curved surface is checked by the fitting results. Detailed mechanism structure and control system design of the bionic prototype are illustrated. The simulation experiments of the propulsor were conducted on the ground and the results show that an approximated harmonic wave can be generated on each side fin. The feasibility of the motion control method is verified.
Research on Direction and Position of Connecting Bolt Looseness of the Tower
Authors: Song Shi Jun , Hao Long Long , Cheng Lu Bo
Published: September 2013

The Direction Judgments of The bolts loosen of standard knot is important for the research of tower crane. We have established a dynamic simulation model of tower crane, and have got the corresponding relationship between top trajectory and angle of the beginning of bolts loosen. And the physical experimental model has been establish to verify the relationship.
Researchment on Valve Sleeve Bore’s Cylindricity Pneumatic Measurement Technology Based on Error Compensation
Authors: Zeng Qi Wen , Wang Guang Lin
Published: September 2013

Raising a pneumatic measurement method to measure the valve sleeve bores cylindricity based on error compensation. Analysis related errors of the raised measurement method, determined the maximum error, and setting up the error compensation model to the maximum error, designed the measurement system, related experiment has been conducted, which verified the correctness of the measurement method and the accuracy of the measurement system.
Research on the Motor Friction Model of Electro-Hydraulic Servo System
Authors: Wang Xiao Jing , Han Wen Xuan , Cui Xiao , Li Shuo Ze , Du Cheng Zhi
Published: September 2013

In order to improve the performance of the electro-hydraulic servo system, considering the special structure of servo motor, nonlinear model of the servo motor was established in time domain. Several friction models commonly used in project were introduced and applied to the simulation analysis of servo motor with friction torque. The simulation curves show the relationship between driving torque, friction torque, angular velocity and angular displacement. The result confirms the influence of the different friction torque model on the performance of motor, and the LuGre friction model is identified which is fit for the friction torque compensation. This study lays the foundation for the friction torque compensation of electro-hydraulic servo motor.
Research on the Trajectory Control Method for Laser Marking
Authors: Yu Qi Wei , Wang Dong Yun , Fang Yu , Zhu Yan
Published: September 2013

Laser marking has become one of the most important identification methods. Compared with the dots scanning marking method, vector scanning marking has a faster marking speed due to its less strokes and smooth trajectory. Based on the principle of the laser galvanometer scanning, an information processing method obtaining the vectors information, pre-marking until control the lasers trajectory is putting forward herein. Experiments proved that this information process method could be applied to character, barcode and any other graphs which could be described by vector information.
Redundant Points Removing of SFS Reconstructed Surface
Authors: Wu Feng He , Yin Qing Jing , Wang Jin Fen , Li Yong Xin
Published: September 2013

To remove the redundant points of image background in SFS reconstructed surface, a novel approach which combines the advantages of polygon scan and intersection algorithm and improves contour extraction method is proposed. In one hand, according to the gray scale level of pixels, the 3D profile of object is reconstructed by Shape from Shading method. In the other hand, firstly, the image is transformed into binary image through single-threshold segmentation method, the defects in image are remedied by morphological method, and the 2D contour of image is extracted through differential operator method; secondly, the image is divided into two parts using the polygon scan and intersection algorithm, that is the objective region and the background region; finally, the redundant points of image background in SFS reconstructed surface are removed through the fusing of 3D profile and 2D contour. Experiments shown that the proposed method can effectively remove the redundant points of SFS reconstructed surface, and it not only ensure the shape precision of SFS reconstructed surface, but also improve the universal of Shape from Shading technique.
The Parallel Mechanism and Variable Acceleration Control Method
Authors: Ouyang Xiang Bo , Li Ke Tian , Xia Hong Jian , Wang Su Juan , Zhou Huan Wei , Hu Chang Wei , Peng Wei Dong
Published: September 2013

t presents the parallel mechanism and variable acceleration control method, which is composed of slider, connecting rod, moving platform and linear guide etc. The motion platform is supported by three connecting rods through hinging, the other end of the connecting rods are respectively hinged with two sliders. Among them two pairs of connecting rod, two sliders and the moving platform formed a symmetric structure that is the so called Parallel Mechanism. The third connecting rod is parallel to one of two connecting rods, so that the two parallel connecting rods, slide block and the moving platform formed a parallelogram structure, it makes that the moving platform is always parallel to liner guiderail in the process of movement. By controlling the two sliders moving in the way of variable acceleration, it can make the trajectory curve, speed curve and acceleration curve of the moving platform are continuous, smooth, so impact and vibration of the moving platform is limited in the operation process.
Research on Testing and Compensation of Speed Jumping Performance in Actuator
Authors: Xu Jian Yuan , Li Yue Feng , Wang Guang Lin
Published: September 2013

Aiming at additional load consisted in jumping performance testing of actuator at present, the paper designed a testing system of mechanical speed jumping performance, and made compensation calculation by shortening the corresponding time of reach a certain speed point. At last, the compensation method was verify that correct and feasible by simulation experiments.
Research and Implementation of Multi-Threading Technology on Embedded Hobbing CNC
Authors: Duan Ye Guang , Han Jiang , Tian Xiao Qing , Xia Lian
Published: September 2013

The embedded hobbing CNC is designed,which is embedded in the WinCE 5.0 operating system,on the hardware platform of ARM+DSP+FPGA ,using Embedded Visual C++(EVC) as a development tool. Hobbing CNC achieves the concurrent operation on the application in order to realizes parallel processing of multi-task, such as the HumanComputer Interaction, data acquisition and issued, data processing and analysis, data storage and so on, based on the analysis of hobbing CNCs working principle, using the multi-threading technology and thread synchronization mechanism possessed by WinCE 5.0. The application simplifies the complexity of the applications development and facilitates subsequent functions improvement, using modular programming method and the object-oriented design. This article provides an effective solution for multi-threaded application in hobbing CNC. After preliminary validation of testing experiments, the hobbing CNC has strong real-time and stability, and can realize the applications real-time and stability required by hobbing CNC machining.
Research and Application of Visualized Real-Time Monitoring System for Complex Product Manufacturing Process
Authors: Li Teng Da , Qin Wei , Zhang Jie , Li Hua , Xu Zeng Guang , Xiao Hai Peng
Published: September 2013

Manufacturing of complex products is a multi-resource coupling process, in order to achieve precise control of its manufacturing process, it should ensure that the manufacturing process information is get in real-time and accurately, achieving the real synchronization of logistics and information flow. Complex products manufacturing workshop represented with aerospace products have poor real-time production information, low production information integration and low visual production monitoring. In order to solve those problems, this paper constructs manufacturing process visualized real-time monitoring system, this system is able to reflect the real-time dynamic workshop production schedule information, quality testing information and abnormal production information and so on. Combined with assembly plant of an Aerospace institutes actual production, this paper designs the architecture, functional structure as well as its business processes of the system, and proposes a metadata-based multi-source heterogeneous information integration technology, then, processes and integrates the collected production process information effectively and displays it through the station terminal, workshops signage. The system is able to share the workshop information resources effectively, and it has been successfully applied to the assembly plant, and has achieved good effect.
Frequency Constant Pressure Control System Based on PLC
Authors: Zhu Qi , Feng Zhi Wen
Published: September 2013

Sewage pumping station is pumping station import at the sewage treatment plant. Its role is to collect the wastewater from the sewage pipe network to subsequent wastewater treatment process facilities. The water level is usually low in sewage collection pipe network. And many wastewater treatment facilities is based on elevation settings. So it is necessary to use lift pump to improve lift of the collected sewage, using high gravity sewage errands subsequent process in order to reduce energy consumption. The traditional way of pumping generally has the shortcomings: the waste of power resources, low efficiency, poor reliability, low degree of automation, which seriously affects the urban sewage treatment capacity. This paper, views pump station control system at the sewage treatment plant as the background, researches frequency control constant pressure control system based on PLC, realizes the energy efficient, automated and reliable direction of development of the sewage pumping station.
Research on VSP Microcosmic Emission Model and Numerical Simulation for Motor Vehicle
Authors: Wang Hai Wei , Wen Hui Ying , You Feng , Yang Gui Feng
Published: September 2013

The paper has first built the vehicle-borne computer sensing integration testing system experiment platform, through the actual road test experiment, collects the different mobile vehicle the operating condition data and emission data, has constructed the different vehicle instant exhaust emission rate and database of vehicles driving cycle-based data correspondence, Establishes the driving cycle and road grade power density microscopic emission model. Uses the typical path roundabout crossing as an example, the paper carries on the power density computation through microscopic simulation software numerical simulation output roundabout crossing region vehicle bicycle the real-time speed, acceleration and other travel data, combined with the previous microscopic emission model of building, calculates the instantaneous mass emission rate and vehicles total emission of roundabout crossing different vehicles pollutant gas. According to the result of software simulation and numerical computation, the paper effectively appraises the regional road roundabout pollution emitted by vehicles, has verify the validity of the in-vehicle computer sensor integration testing and emission assessment model, provide a reference for seeking to solve regional traffic roundabout environmental pollution testing methods and effective assessment.
Organization Optimization of Traffic Engineering in Urban CBD
Authors: Huang Mei Mei , Yang Qing , Xiao Shang Lin
Published: September 2013

Orderly organization of traffic engineering in the urban CBD (Center Business District) is a difficult problem, with crowding people flow, heavy traffic flow and complex surrounding situation. This paper set CBD along Xinhua Street in Jinhua city center as an example, focused on the organization optimization process of traffic engineering in CBD. Through the survey on traffic engineering status of sections and intersections, it analyzed road congestion characteristics and intersection signal timing with Vissim software emulation, proposed traffic optimization methods as road channelization, intersection signal timing adjustment of Xinhua-Liberation Road. In Xinhua Street section, it can effectively canalized traffic flow by broadening 2 two-way lanes, adding four pedestrian crossing refuges, and separating Motor vehicle and non-motor vehicle separation barrier. It took queue length, number of stops, delay time three indicators as the objective function with the application of Synchro software adjusting the intersection signal timing. As a result, the total queue length could be reduced from 708.5m to 586.6m and total capacity from 2041 pcu/ h to 2838 pcu/ h.
Fabrication and Evaluation of Titanium Dioxide Nanotube Thin Films by Anodic Oxidation on Transparent Electrodes
Authors: Okumoto Yusuke , Kawakami Ryo , Sato Yuuki , Yoshikado Shinzo
Published: September 2013

Titanium dioxide nanotube (TNT) thin films were fabricated, for application as the negative electrode of dye-sensitized solar cells (DSC), by anodic oxidation of titanium thin films deposited by RF magnetron sputtering on indium tin oxide glass substrates. Anodic oxidation was carried out by a constant voltage or constant current method in an electrolyte in order to determine the best method to increase TNT film thickness. Thick titanium dioxide films were fabricated by the constant voltage method at higher voltages. Thicker titanium dioxide films were obtained by the constant current method compared to the constant voltage method. However, the constant current method with optimal current yielded TNT films with higher quality (high transparency). The power conversion efficiency of DSC was improved using films fabricated by the constant current method.
Fabrication of Nanostructured Zinc Oxide Films on Plastic Substrates by Pyrolysis Method and their Application to Dye-Sensitized Solar Cells
Authors: Utsunomiya Hirokazu , Ueno Shintaro , Fujihara Shinobu
Published: September 2013

t has been attempted to utilize plastic substrates for electrodes, instead of conventional glass substrates, to fabricate flexible, lightweight, and low-cost dye-sensitized solar cells (DSSCs). We examined a pyrolysis method by which preformed layered hydroxide zinc acetate (LHZA: Zn5(OH)8(CH3COO)2·2H2O) films were converted into ZnO films at temperatures below 120 oC. Since the pyrolyzed films still contained zinc acetate compounds, they were immersed in hot water aiming at removing such the impurities. This hot water treatment influenced the film morphology to a large extent. The energy conversion efficiency of 3.41% was obtained for the cell using an N719/ZnO electrode fabricated on an indium tin oxide-coated polyethylene naphthalate (ITO-PEN) substrate through the present pyrolysis method.
Polarization Switching Dynamics of Ferroelectric (Bi0.5Na0.5)TiO3 Single Crystals
Authors: Yanai Ken , Onozuka Hiroaki , Kitanaka Yuuki , Noguchi Yuji , Miyayama Masaru , Moriyoshi Chikako , Kuroiwa Yoshihiro
Published: September 2013

Ferroelectric (Bi0.5Na0.5)TiO3single crystals were grown by a top-seeded solution growth method at a high oxygen pressure of 0.9 MPa and their polarization switching dynamics were investigated atex-situelectric fields along <100>c. Synchrotron radiation single-crystal X-ray diffraction analyses showed that a splitting of each reflection into four spots were clearly observed during polarization reversal. This splitting is associated with the polarization states with the spontaneous polarization vectors along four directions of equivalent <111>cIt is concluded that the polarization reversal is achieved through non-180 ° (71 ° and 109 °) domain switching in the BNT crystals along <100>c.
Preparation of Grain-Oriented Ceramics with Bismuth Potassium Titanate-Barium Titanate and their Piezoelectric Properties
Authors: Inaba Katsuya , Fujii Ichiro , Nakashima Kouichi , Hayashi Hiroshi , Yamamoto Yuichi , Kuroiwa Yoshihiro , Wada Satoshi
Published: September 2013

Bismuth potassium titanate ((Bi1/2K1/2)TiO3: BKT) powder were prepared using bismuth oxide (Bi2O3), potassium hydrogen carbonate (KHCO3) and titanium oxide (TiO2) raw materials. Barium titanate (BaTiO3: BT) platelike particles oriented along [110] direction were used as template particles. Barium titanate-bismuth potassium titanate (BT-BKT) ceramics had a tetragonal phase at -100 °C. The main composition was fixed to BKT 30 molar% because the Curie temperature (TC) was well above 200 °C at BKT 30 molar%. The orientation of [110]-oriented BT-BKT ceramics (BKT 30 molar%) was 54.6 %.
Cobalt Based Alloys for Dental Applications
Authors: Ghiban Brandusa , Borţun Cristina Maria , Ghiban Alexandru , Ghiban Nicolae
Published: September 2013

The present paper put in evidence the mechanical behaviour of some commercial dental cobalt alloys, after own classification. The experimental cobalt alloys were classified in according either with molybdenum content, or with Cr+Mo content. A hierarcy of the alloys was finally made. The fractographic surfaces were investigate both by stereomacroscopy and scanning electron microscopy, putting in evidence the main structural features.
Structural Analysis of Steels by Cavitation Erosion
Authors: Manzana Madalina Elena , Ghiban Brandusa , Bordeasu Ilare , Ghiban Nicolae , Marin Mihai , Miculescu Florin
Published: September 2013

Cavitation is an important factor in many areas of science and engineering, including acoustics, chemistry and hydraulics. In this paper the authors analyze the structural analysis of cavitation damages in two steel. The cavitation erosion tests were carried out in a magnetostrictive facility, in Timisoara Hydraulic Machinery Laboratory, in according with ASTM G32-85, using as cavitant liquid drink water at 20 10C. After quantitative and qualitative investigations structural features were put in evidence on experimental steel
New Polyurethane Sealants Containing Rosin for Non-Invasive Disc Regeneration Surgery
Authors: Carbonell-Blasco Pilar , Antoniac Iulian , Martin-Martinez Jose Miguel
Published: September 2013

Different polyurethane sealants were prepared by reacting methylene dyísocyanate and polyadipate of 1,4 butane diol (Mw : 2500 daltons) by using the prepolymer method and different mixtures of rosin and 1,4 butane diol were used as chain extenders. The polyurethanes were characterized by plate-plate rheology, molecular weight distribution, Differential Scanning Calorimetry (DSC), and Laser Confocal Microscopy. The tack of the polyurethanes sealants was obtained by using a modified probe tack method, and their adhesion was obtained by T-peel test of leather/polyurethane sealant/leather joints and by single lap-shear tests of aluminium/polyurethane sealant/aluminium joints. Depending on the rosin content in the chain extender the structure of the polyurethanes was different, i.e. more urethane and urethane-amide hard segments were created up to 50 eq% rosin in the chain extender, and separation of domains was prevailing in the polyurethanes with higher rosin content. Furthermore, the addition of rosin caused an increase in the length of the polymer chains and in the storage modulus (particularly in the polyurethane containing 50 eq% rosin), and decrease in the melting enthalpy. Moreover, the crystallinity of the polyurethanes containing up to 50 eq% rosin showed lower number and smaller spherulites, Finally, the tack at 37 °C and the peel strength increased in the joints made with the polyurethane sealants containing rosin whereas the adhesive shear strength decreased when the polyurethane sealant contained 50 eq% rosin or less.
UV Light as a Tool for Surface Modification of Polymeric Biomaterials
Authors: Sionkowska Alina
Published: September 2013

UV light as a tool for surface modification of polymeric biomaterials was considered. In the present work the modification of the surface properties of collagen films, chitosan films and silk fibroin films by UV-irradiation is presented. It was found that the contact angle and the surface free energy were altered by UV-irradiation of biopolymeric films. Moreover, the surface roughness of biopolymeric films was altered by UV-irradiation. UV-irradiation caused the decrease of surface roughness of collagen films, chitosan films and silk fibroin films. KrF laser treatment caused a significant damage of the surface of biopolymeric films and due to the ablation process the micro-foam was formed. As a conclusion one can say that UV light can be used for modification of surface polarity, surface roughness and for 3D formation structure on the biopolymeric films. The modification by UV light can be save method of biomaterials treatment without any chemicals used for alterations of the surface properties.
Adaptive Error Control Algorithm for High Speed Two-Axis CNC Contouring
Authors: Dong Jing Chuan , Wang Tai Yong , Ding Yan Yu , Cui Yu Long
Published: September 2013

The computerized numerical control (CNC) machining program usually contains a large number of small line segments. The CNC controller must generate a smooth and optimized motion profile to achieve high speed and high precision machining. This paper proposed an adaptive contour error control algorithm. The curvature radius of the tool path is obtained by analyzing the geometry relationship. The algorithm uses the curvature information and a simplified servo error model to realize contour error estimation and adaptive control. The target feet rate filter (TFF) and planning unit merging (PUM) are introduced to obtain a smooth profile. Experiments result demonstrated the efficiency of the proposed algorithm.
Structural Design and Analysis of the New Mobile Refuge Chamber
Authors: Chang De Gong , Shao Chen , Li Song Mei , Du Min Min
Published: September 2013

At present, the mobile refuge chambers are mostly used square or circular structures. Based on these researches, a new chamber structure is presented in this paper, which is square and circular combined structure. The size and connection way are designed through the analysis of the working conditions and the requirements of the installation, transportation, maintenance and so on. Then the new structure is simplified to four kinds of cabin model, which can be analyzed by the ANSYS software. By the simulation analysis the reliability of the new structure is determined, which provides a theoretical basis for guiding the structural design of the mobile refuge chamber.
Research on Application and Analysis of Manufacturing Material Flow
Authors: Liu Ri Mei , Yang Shu Yuan
Published: September 2013

Manufacture is the pillar industry of national economy, yet its efficiency of the utilization of raw materials and energy needs increasing, and the consumption of environment needs improving urgently. From the perspective of material flow management, we introduce the material flow cost accounting (MFCA) to manufacturing enterprises and check computations according to two dimensions: value flow and material flow during the productive process. It can help achieve the goals of cutting the materials costs, saving the resources consumption and lowering environmental impact, thus the manufacturing enterprises can strengthen their competitive power and realize their own development.
Study on Risk Management of Manufacturing Industry's R&D Project
Authors: Liu Ta , Han Dong Ping
Published: September 2013

The high risk of R&D projects has always been a negative factor that discouraged manufacturing industry to develop. However, R&D projects are the inevitable option for manufacturing enterprises to realize a leap-forward development. Thus, the optimal choice for manufacturing business is to apply the R&D project risk management model based on complexity theory, total system intervene theory and the idea on flexible strategy transformation with scientific recognition on R&D risks, involving information degression principle, risk-benefit balancing principle and the probable transformation relationship among the R&D risks.
Effects of Small Amount Addition of Rare Earth Y on Microstructure and Property of Sn3.0Ag0.5Cu Solder
Authors: Li Hui
Published: September 2013

In the present work, effect of adding small amount of Y on the microstructure, physical and mechanical properties of Sn3.0Ag0.5Cu solder has been investigated. The purpose is to understand if the heavy rare earth Y has similar effect as light rare earth Ce or La on improving properties of SnAgCu lead-free solder. The results indicated that adding small amount of Y can evidently improve the wettability, mechanical strength and creep rupture life of the Sn3.0Ag0.5Cu solder alloy. It is pointed out that proper Y content in the Sn3.0Ag0.5Cu solder alloy should be in a range of 0.05~0.25wt%. Moreover, It is felt that the increase in mechanical strength may be related to the refining of IMCs of the solder due to the addition of small amount of Y.
Research on Machinability of the Shell Materials and Tools' Failure
Authors: Hu Qiang , Liu Xian Li , Yan Fu Gang , Cheng Yao Nan , Qiao Shuai , He Geng Huang
Published: September 2013

Large cylindrical shell is a large diameter and thick wall tube part working in high temperature and high pressure environment. It is made of 2.25Cr-1Mo-0.25V high strength steel, whose machinability is special. The characteristics of cutting temperature and cutting force are researched in the cutting process by analyzing the machinability of 2.25Cr-1Mo-0.25V steel in this paper. And the main tool failure modes are analyzed in the cutting process, combining with empirical approach to compare tool failure modes under cutting different steels. The high efficiency cutting measures are proposed in tool optimization design finally, in order to provide a reference for high efficiency machining of large cylindrical materials.
Simulation Research of Small Holes by Combined Ultrasonic and Electrochemical Machining Based on CFX
Authors: Liu Ze Xiang , Kang Min , Fu Xiu Qing
Published: September 2013

A device was designed to study the small holes by the rotary combined ultrasonic and electrochemical machining, and the gap between cathode and anode in the processing was also analyzed. A three-dimensional model of flow field was developed in ANSYS CFX software based on FEM by the gas-liquid two-phase fluid cavitations model as well as the effect of rotary cathode and the vibrated cathode to the flow field was analyzed. The simulation showed that the pressure and the velocity of the electrolyte in the gap were oscillated by additional motion of cathode, which is helpful to the electrochemical machining. The comparison of rotary electrochemical machining and the rotary combined ultrasonic and electrochemical machining showed that the rotary combined ultrasonic and electrochemical machining has better ability of making small holes than that of rotary electrochemical machining
Experimental Investigation on Electroformed Copper-Based Zirconia Nanocomposites Aided by Ultrasonic
Authors: Li Zhi Yong , Cui Hong Bin , Dong Pei Yu , Liu Tao
Published: September 2013

To improve the mechanical properties of the EDM electrode material, the electroforming process for fabricating copper-nanozirconia (ZrO2) particles composite aided by ultrasonic has been presented. In this research, some vital process parameters such as concentration of ZrO2, rotational speed and ultrasonic frequency have been evaluated. Two inspection criteria, content of ZrO2and micro hardness of deposited layer were employed to evaluate the fabrication quality of copper-nanozirconia (ZrO2) composite material. The experimental results indicate that nanocomposites grains electroformed aided by ultrasonic are refined. Their organizations are more uniform and dense, the surface is flatter and the microhardness of nanocomposites is significantly improved.
Fracture Stress of Ultrahigh Strength Ribbons Determined by Microhardness
Authors: Csach Kornel , Miškuf Jozef , Juríková Alena
Published: September 2013

Ultrahigh strength amorphous alloys Fe65.9Cr11.6Si7.5B15 and Co43Ta5.5Fe20B31.5 prepared by rapid quenching have the form of ribbons with thickness of about 40 micrometers with some imperfections in the sample width and the cross section. Fractographic analysis of Co- and Fe-based high strength soft magnetic materials showed the high localization of the plastic deformation and the ductility in narrow shear bands. To estimate the fracture stress, the Vickers microhardness and the average width of dimples (or the wavelength of the vein features) on the fracture surface were used. Based on the microhardness, the tensile yield strength was calculated as 4 and 5 GPa for Fe-based and Co-based glass, respectively. We estimated the fracture toughness from the measured mean value of the dimple size.