bluuebunny/crossref_metadata_2025 huggingface dataset:
Power Spectrum Analysis Based on VB Language
Authors: Zhou Jing Ling , Wu Shu Qian , Wu Guo Qing , Zhai Chun Shu , Mei Mei , Yang Shu Yun , Chen Zhi Ming , Lu Peng Peng
Published: July 2014

Power spectrum analysis is one of the important part of digital signal processing, various characteristics of the main signal in the frequency domain, is designed based on the limited data and extract the useful signal is submerged in the noise in the frequency domain. In this paper, the VB language to realize the power spectrum analysis can extract the useful signal was drowned in noise in frequency domain based on power spectrum, frequency structure and physical meaning analysis reflected the more obvious, monitoring and diagnosis in rotating machinery fault, power spectrum analysis is very wide.
Research on Active Absorbing Wave Maker System
Authors: Zhang Ya Qun , Yu Long Fei
Published: July 2014

Reflected waves in water tank are the key interference on model test results. Active absorbing wave making system eliminates interference waves in tank, and provides a long time good test environment for related hydrodynamic test. Basing on Airy wave theory, active absorbing wave-making method is put forward, and control equation of rocking-plate wave maker is derived. Using AC servo-control technology, active absorbing wave making control system is designed based on the method mentioned above, and active wave making control software is compiled. Through three feedback routes, it realizes that the precise control of a wave maker, the interference waves absorption, the output of a target wave. When the output wave elements are same, the experiments adopt absorbing and non-absorbing wave making method. Comparison test results show that the feasibility and effectiveness of active absorbing wave method. Finally, the active absorbing wave making method improves the quality of waves, reducing interference of reflected waves.
Speeding Maintenance Performance through Time Study
Authors: Harudin Nolia , Yusof Sha’ri Mohd
Published: July 2014

As more than $300 billion spent on plant maintenance and operations, U.S. industry spends as much as 80 percent of this amount to correct chronic failures of machines, systems, and people. With machines and systems becoming increasingly complex, this problem can only worsen, and there is a clear and pressing need to establish comprehensive equipment management programs that incorporate the diverse considerations that are essential to minimizing risk and lead to effective maintenance. In a production or manufacturing environment, good maintenance engineering is necessary for smooth and safe daily plant operations. This research which was conducted at one of the worldwide well known Semi Conductor Company located at Kedah, Malaysia were drive subject to improve the effectiveness of preventive maintenance activities through lean approaches. Tools such time study, spaghetti diagram and FMEA were the main key tools and concept drive throughout this research. Machine Availability is the indicator used to evaluate the improvement expected for all the proposal took in placed. With the team effort and several proposal were addressed, Machine Availability able to be improved about 0.4% which lead to improvement of weekly preventive maintenance from 4 hours on actual observation to only 1 hours as new target. It also indirectly lead to the improvement of monthly preventive maintenance which may only require 4 ½ hours instead of 5 ½ hours of previous target. The result is currently practiced and team still looking for further opportunity to improve.
Ontologies to Capture and Share Knowledge in a Distributed Environment Needed to Support Decision Making in Probabilistic Design
Authors: Lee Kwang Ju , Choi Joon Hyeok
Published: July 2014

Durability and reliability must be considered in the design of structural components. For this purpose, the failure probability is found using probabilistic analysis. A component in an automotive structure usually has many different designs depending on vehicle models. Even in the same vehicle model, the design of the component changes once in a few years. It is important to build up database so that engineers share knowledge in the design of components. The purpose of this study is to develop ontologies in the probabilistic analysis of structures. The ontologies can be used to capture and share knowledge for design process. They also help engineers make decisions on choosing appropriate software and algorithm for the probabilistic analysis of structures.
Dynamic Clustering Heuristic Method for Smart Grid Computing
Authors: Kim Jeong Sig , Kim Jin Hong
Published: July 2014

Efficient scheduling has appeared as a fundamental problem in smart grid computing systems. Since finding an optimal scheduling on the system to minimize the program completion time is a well-known NP-complete problem in general, researchers have resorted to devising efficient heuristics. In this paper, we present a dynamic scheduling heuristic which is appropriate for the system. The goal is realized with four general metrics and two additional restricted metrics, which not only take the communication cost, priority, mutex between jobs into account, but also consider the characteristic of the resource, such as the storage capability and the dynamic characteristic in smart grid computing.
Research of Hadoop Task Speculative Execution Based on Process Migration
Authors: Liang Yin Cheng , Zhu Kai , Du Cui
Published: July 2014

Current Hadoop platform task speculative execution can’t guarantee the backup task execution speed. This paper proposes a Hadoop speculative execution mechanism based on process migration. The backup task initializes the Task state with ExecutionState object which is formed according to the original task status. Thus, the backup task can continue the task instead of restarting a new task, this makes sure the backup task is more efficient than the original task. The results of running jobs on the hadoop platform prove that task speculative execution based on progress migration improves the efficiency greatly.
Research on Photochromic Compounds with Efficient Synthesis and Photochromic Properties of 1-(2-methyl-5-chlorine-3-thienyl)-2-[2-methyl -5-(4-chlorophenyl)-3-thienyl] Perfluorocyclopentene
Authors: Sun Feng Xia , Cui Shi Qiang , Pu Shou Zhi
Published: July 2014

A novel unsymmetrical diarylethene derivative bearing both phenyl and thiophene moieties, in which two chlorine groups were separately substituted at thiophene and the para-positions of the terminal phenyl ring, were synthesized. Its photochemical , fluorescence properties were investigated systematically both in solution and PMMA amorphous film. The results showed that this compound exhibited reversible photochromism, changing from colorless to purple after irradiation with 313 UV light both in solution and in PMMA amorphous film. Also, it exhibited remarkable fluorescence switching in the solid state.
Nonlinear Aeroelastic Analysis for a Rudder with a Hydraulic Booster
Authors: Xu Xing Zhi , Gao Ya Kui , Zhang Wei Guo
Published: July 2014

Nonlinear aeroelastic characteristics of a rudder with a hydraulic booster are investigated, including the structural nonlinearity and dynamics of the hydraulic booster. The component mode substitution method is used to establish the nonlinear governing equations based on the fundamental dynamic equations of the hydraulic booster and rocker arm. Simulations are carried out when the control command is not zero and further analysis is conducted when the freeplay angle is changed. The results show that the effects of the actuator and the structural nonlinearity have a significant influence on the flutter characteristics. In the nonlinear condition, the phase and frequency of the control command have both an influence on the flutter characteristics.
Effect of Wall Roughness and Flow Velocity on Water Hammer
Authors: Meng Qing Zheng , Yang Cheng , Liu Li Sheng , Wang Zhen
Published: July 2014

Water hammer can occur in any fluid pipeline systems. The pressure caused by water hammer are far exceeding the pressure range of the pipe limit, and it can lead to the failure or fracture of the pipeline. Since a great loss has been caused by that, two influence factors (flow velocity and roughness of the pipe-wall) associated with water hammer have been performed by using the numerical simulation software CFX. Analysis of the results show that each factor effects differently in waveform, amplitude, period, attenuation of the water hammer wave. The different velocities only influences the peak of pressure wave but not the waveform and period. The pressure reduction as the increase of roughness can be neglected compared to the normal pressure.
Computer Simulation of a Certain Heavy Vehicle Part
Authors: Feng Su Li , Zhang Guang Yu , Tian Zhi Gang
Published: July 2014

This paper used software Solidworks to build 3-D model of a certain Heavy Vehicle Part, then analyzed the model strain state under typical operation condition by ANSYS. The simulation of the part provides the basis for the structural design.
Automatic Battery Testing Platform for Series-Connected Lead Acid Batteries
Authors: Chen Chun Ming , Hsieh Hung Wei , Juan Yu Lin , Chen Tsair Rong , Chen Peng Lai
Published: July 2014

In this paper, an automatic testing platform was developed. A complete charging and discharging cycle for the series-connected lead-acid batteries is carried out by the testing platform to record the capacity, charging efficiency, and other relative data of the batteries. A microcontroller unit (MCU) is used to replace the common DAQ card for cost reduction. The voltage and current of the batteries are sampled by the MCU and saved by the software LabVIEW on the personal computer. The charging and discharging procedures are automatically switched by the software LabVIEW according to the state of the batteries. A complete testing data can be provided by the LabVIEW at the end of the testing cycle. New and old battery modules are both tested with the proposed platform and another reliable testing system to evaluate the validity of the proposed system.
Modeling and Simulation of Elevator as Energy Saving System Based on Isolation Bidirectional DC/DC Converter
Authors: Han Wei We , Wan Jian Ru , Huang Shao Lun , Dai Qing You
Published: July 2014

To solve the problem as influence of feedback elevator energy saving device on power quality and high cost of ultracapacitor storage elevator energy saving device, isolation bidirectional DC/DC converter is used. By analysis and modeling of isolation bidirectional DC/DC converter with small signal analysis method, double loop PI control strategy is introduced. The technical difficulty that high transformation ratio transform of DC bus voltage to ultracapacitor voltage is overcome. Cost of elevator energy saving device is reduced at the same time when storage and reuse of elevator feedback energy are realized. Based on the advantage of high current discharge, high current provided by ultracapacitor reduces impact on power grid when elevator starts. The effectiveness and feasibility of the control method is proved through MATLAB/Simulink simulation.
Research on a Novel Method for Road Edge Detection Based on Road Environment
Authors: Wang Yan Qing , Zhuang Lu Lu , Chen De Yun , Zhang Zhen Wei
Published: July 2014

Considering the difficulty of real-time, robustness for the edge detection in the unstructured road environment, a heuristic probabilistic Hough transform method for weighted Canny edges image was proposed in this paper. The experiment results in the unstructured road environment demonstrated the validity and real-time of the proposed method.
Study on COD Emission Reductions Assignment of Basin Based on Information Entropy Method and Gini Coefficient Method
Authors: Tang Yu Lan , Li Ya Na , Dong Xu , Yan Ran
Published: July 2014

The Qinghe and Fanhe basin in Tieling, Liaoning were studied as case in this sduty. The COD emission reduction was assigned by the method of information entropy and the Gini coefficient method first. Then the correlation between the calculation methods and the water environmental quality was analyzed. Finally, the best method of reduction calculation was identified. The results showed that the information entropy method was a better method in total allocation because it was highly correlated with water environment quality,at the same time it combined the pollution reduction and water environment quality management better. The results also showed the COD reduction in Qinghe basin was larger than Fanhe basin, so the Qinghe basin was the focus of emission reduction.
Key words: Information entropy method;Gini coefficient method;COD emission reduction assignment;Correlation
Applied-Information Technology and Low-Carbon Industry in Research on the Developmental Path and Evaluation System of Hengyang Low-Carbon Community
Authors: Wu Yue , Dong Zi Xiong
Published: July 2014

Community is based on a certain region of the community of human life. In the face of increasingly serious ecological crisis, a benign living environment has became the urgent need for human beings. Under the guidance of sustainable development and ecological civilization concepts, as well as relying on the paths of applied-information technology,Low-carbon industry,low-carbon transport and low-carbon consumption, we can establish an evaluation index system from low-carbon buildings, low-carbon production, low-carbon transport, low-carbon consumption etc.by the Delphi method and analysis hierarchy process (AHP), so as to promote the development of Hengyang low-carbon community.
Research on Intelligent Control Technology with Building Energy Control Model Based on Intelligent Control Algorithm
Authors: Wang Wei Ping , Zhou Li
Published: July 2014

For the current smart building energy control algorithms are still large energy loss, poor energy-saving effect and other issues, this paper presents a fuzzy neural network algorithm based on improved BP algorithm, the improved algorithm of BP neural network algorithm first reverse dissemination and weighting coefficients are adjusted to accelerate the convergence rate of the original algorithm, and then build the improved BP neural network algorithm for fuzzy neural network, and then to improve it fuzzy membership function parameters to improve the efficiency of fuzzy neural network learning. Simulation results show that the proposed fuzzy neural network algorithm based on improved BP algorithm in the intelligent building energy control, with the algorithm is better than traditional BP neural network energy savings, reducing the energy loss rate.
Investigation on Characteristics of Ni-Base Self-Fluxing Alloy Powders
Authors: Hu Chun Lian
Published: July 2014

Morphologies, particle size distribution, microstructure and hardness of Ni-base self-fluxing alloy Ni60A powders are investigated by means of metallographic observation, laser particle size analysis, Hall flow, infrared absorption, surface rockwell hardness methods. The results indicate that Ni60A alloy powders have better sphericity, more smooth on powders’ surface, less joint structure, and single peak particle distribution similar to normal distribution. Bulk-and needle-like hard metallograph are precipitated in its microstructure and its HRC can reach 60-61.
The Research of PWR Steam Generator with Water Level Control Based on RBF Neural Network
Authors: Yang Xu Hong , Jian Yang , Feng Cheng Chen , Xue Yang
Published: July 2014

In the steam generator with water level control system of nuclear power plant, there are various uncertainties in the controlled devices. Any actual system had certain nonlinear. Because of the steam generator is very important equipment in nuclear power plants, water level control plays a decisive role for the safe operation of nuclear power plant and it required stable operation and fast response of the whole system. For the highly complex, non-linear system , the traditional cascade PID control had been used cannot obtain satisfactory control effect, this paper try to use RBF neural network to optimize the PID parameters. The simulation experiments show that: the rbf neural network optimized controller made the control system’s robustness and control quality superior than the traditional PID controller, and described the method can be applied more widely.
Delay Analysis of Underground Communication Using Network Coding
Authors: Liang Mo , Wang Chen
Published: July 2014

Underground communication system can be organized as a delay tolerant network (DTN), where delay analysis is of importance. In this paper, we derive the analysis method of block delivery delay in underground DTN using network coding. Unlike existing works that only use the contact-based model, we adopt the random walk on 2-D grid model as our mobility model. We define the innovativeness of a node as the number of new packet it can bring to the destination and derive the network state dynamics based on this definition. The simulations show that our analytic approach has better prediction to the delay performance.
Automatic Splicing Technology in Image Splicing Processing
Authors: Yu Xiao Bo , Zhang Yun Feng , Fu Yue Gang
Published: July 2014

Automatic splicing technology is all important research field of image processing, and has become a research focusing on the computer vision and computer graphics,and has important practical value in the fields of image splicing processing, medical image analysis and so on.On the basis of a linear transition method, this paper presents an algorithm which realizes to diminish the seams in overlap region according to the content of scenes.This algorithm avoids manual intervention during the mosaic process.With the help of automatic splicing technology based on the overlapping areas linear transition, the requirement of seamless image splicing can be met. 1.Introduction
Analysis and Design of the Cloud System of Inner Mongolia National Cinema Line
Authors: Xu Hai Hua , Liu Li Ping , Liu Bai Chuan
Published: July 2014

To make the inner Mongolia National cinema line company to expand the low-cost movie channel benefitting civilian, take better advantage of the company's movie integration and issue, bear the spread and services of films in the whole inner Mongolia Autonomous Region, in this paper, we design and implement the cloud system of inner Mongolia National cinema line, take intelligent digital television operating system under the cloud technique as carrying and transmission tool, broadcast a front-end frequency point through the cable digital television network in the total region, broadcast the digital and cultural content, such as high-definition movies, digital books, party member education , technical training, newspapers, magazines, government information and convenience information, to each neighborhood and community, all levels of schools, factories and business units in the whole region, build the cloud cinema of multi-functional digital cinema hall whose contents are unified, with truly unified management, unified propaganda, unified arranging videos, service on demand, promote the industrial development of national digital culture industry, expand new channels of the national film show, serve the overwhelming majority of community residents.
Applied-Information Technology in the Internet of Things in the Construction of File Security System in Colleges and Universities
Authors: Zhao Ying
Published: July 2014

Along with the development of information technology, archives information has developed from original paper archives to current digital archives, electronic photos, electronic drawings etc., and the utilization of archives has also achieved computer search and online inquiry. The development of various modern information stealing technologies has brought potential threat to the security of network archival information, especially some military scientific research archives, student archives etc., which are not only involved with the normal operation and development of schools, but also with official secrets. Therefore, establishing the archives security system of colleges and universities has become the priority among priorities in the archives work of colleges and universities. This article starts from the current status of the archives security system construction of colleges and universities, analyzing the apparent features of the technology of the Internet of Things in information technology, and then raising the specific application measures of the technology of the Internet of Things in archives security system construction of colleges and universities, making suggestions on the archives security system construction of colleges and universities.
Data processing with an Improved Hybrid Optimization Algorithm Base on PSO-GA
Authors: Zhang Fu Kun , Zhang Shu Wen , Ba Gui Zhi
Published: July 2014

This paper develops an improved hybrid optimization algorithm based on particle swarm optimization (PSO) and a genetic algorithm (GA). First, the population is evolved over a certain number of generations by PSO and the best M particles are retained, with the remaining particles excluded. Second, new individuals are generated by implementing selection, crossover and mutation GA operators for the best M particles. Finally, the new individuals are combined with the best M particles to form new a population for the next generation. The algorithm can exchange information several times during evolution so that the complement of two algorithms can be more fully exploited. The proposed method is applied to fifteen benchmark optimization problems and the results obtained show an improvement over published methods. The impact of M on algorithm performance is also discussed.
Digital Signal Modulation with Recognition Algorithm to Identify the Ability to Optimize the Wavelet
Authors: Yan Shu Mei , Fang Hui
Published: July 2014

Large errors in the digital signal modulation recognition algorithm for the general wavelet transform, we propose a discrete optimization algorithm based on wavelet transform, which is generally improved algorithm based on wavelet transform algorithm, the original algorithm in order to avoid redundancy Yu phenomenon, discrete variable domain transform operation, the wavelet transform and then use the algorithm to improve the amplitude modulation of digital signals, quadrature amplitude modulated signal, a digital frequency-modulated signal and the digital phase modulated signal is identified. Simulation results show that the discrete wavelet transform algorithm optimization wavelet transform algorithm than the digital signal modulation recognition applications to identify errors in the proposed smaller, more accuracy.
The Application of Local Mean Decomposition and Variable Predictive Model-Based Class Discriminate in Gear Fault Diagnosis
Authors: Xu You Cai , Li Xin Shi , Tao Ran , Guo Shu , Gou Min , Li Kun
Published: July 2014

The time-domain energy message conveyed by vibration signals of different gear fault are different, so a method based on local mean decomposition (LMD) and variable predictive model-based class discriminate (VPMCD) is proposed to diagnose gear fault model. The vibration signal of gear which is the research object in this paper is decomposed into a series of product functions (PF) by LMD method. Then a further analysis is to select the PF components which contain main fault information of gear, the energy feature parameters of the selected PF components are used to form a fault feature vector. The variable predictive model-based class discriminate is a new multivariate classification approach for pattern recognition, through taking fully advantages of the fault feature vector. Finally, gear fault diagnosis is distinguished into normal state, inner race fault and outer race fault. The results show that LMD method can decompose a complex non-stationary signal into a number of PF components whose frequency is from high to low. And the method based on LMD and VPMCD has a high fault recognition function by analyzing the fault feature vector of PF.
Research on Industry Image Technology with the Integration Algorithm of Color Features and Feedback of Image Retrieval
Authors: Zhang Shui Li
Published: July 2014

Current image retrieval methods use only one kind of image features, which can not describe image content completely. In this paper, an image retrieval method based on color and texture integration is proposed. Calculation of similarity for the individual features is normalized before color feature integration. In order to improve the precision of image retrieval, a relevance feedback mechanism is invoked. The experiment results show that the proposed method has an excellent retrieval performance.
The Method and Evaluation of Biological Materials to Functional Reconstruction of Ligament Defects in Exercise-Induced Ligament Injury
Authors: Peng Bao , Xiao Qian , Dang Xue
Published: July 2014

At present, in order to make the biological material in the treatment of ligament, tendon defect with good biocompatibility and cell affinity, to the surface modification of biomaterials, commonly known as surface modification. The surface modification methods contain fixed proteins, fixed peptide and radiation grafting and ion implantation. Research shows that, through surface modification of biomaterials, not only enhance the cell adhesion, but also promoted cell proliferation. The surface modification of biomaterials is a complicated system engineering, need to take into consideration the needs in materials science and biological science, and optimize. Ideal surface modification should take into account the surface topology, specific recognition, hydrophilic hydrophobic balance, protein adsorption, all aspects of functional new tissues can be obtained. This provides a good prospect of application for the repair of exercise ligament injury.
Effect of Zeolite Admixture on Freeze/Thaw Resistance of Concrete Exposed to the Dynamic Climatic Conditions
Authors: Kočí Václav , Jerman Miloš , Maděra Jiří , Černý Robert
Published: July 2014

This paper aims at computational simulation of effect of zeolite admixture on service life of concrete building envelope from point of view of freeze/thaw resistance. Hygrothermal behavior of two types of concrete is studied in this paper: reference concrete without any admixtures and zeolite concrete with 40 % zeolite as cement replacement. The computations are performed using computer simulation tool HEMOT, which processes the input parameters using finite element method. The simulation is assumed under dynamic climatic conditions of Prague. As the results of the computational simulations showed, assuming analyzed amount of zeolite, any positive effect of on freeze/thaw resistance was not found related to unprotected building envelope. However, the results indicated, hygrothermal performance of zeolite concrete can be very considerate to applied external layers and thus extend their service life.
Comparison of Two Different Modes of Inverse Analysis Used for Determination of Moisture Diffusivity of Building Materials
Authors: Kočí Jan , Pavlík Zbyšek , Černý Robert
Published: July 2014

This paper gives a brief overview of two different approaches within the inverse analysis used for determination of moisture diffusivity of porous building materials. The inverse methods are represented by Boltzman-Matano approach and genetic algorithms. Both methods are described in this paper and its application is demonstrated on a simple laboratory experiment. Finally, the results of both treatments are compared together and short discussion is given.
Application of Digital Optical Microscopy in Materials and Mechanical Engineering: Optical Porosimetry and Crack Detection
Authors: Ďurana Kamil , Černý Robert
Published: July 2014

Optical microscopy presents an extension of standard methods for pore space description. In this paper two examples of application in materials and mechanical engineering are introduced. The porosity and pore size distribution of two types of AAC are measured. In the second example the thermally induced cracks of cement fiber composite are visually detected and mathematically described. The technology of sample preparation, measurement technique and digital image processing is described, while advantages and disadvantages are discussed.
Heat and Water Vapor Transport Properties of Selected Commercially Produced Plasters
Authors: Čáchová Monika , Koňáková Dana , Vejmelková Eva , Keppert Martin , Polozhiy Kirill , Černý Robert
Published: July 2014

Although plaster belonged to the first structural materials, they are still getting further enhancements. Nowadays different companies are producing and selling plasters that differ either in their composition or purpose. This article is comparing plasters presented on the market in the Czech Republic. Those are lightweight, renovation and even most common lime-cement plasters. Among the studied characteristics were: basic physical properties (for comparison were measurement of two methods: vacuum water saturation and helium pycnometry); they water vapor transport parameters and heat transport parameters. Lightweight and renovation plasters had shown the biggest porosity, lowest thermal conductivity and the highest diffusion resistance factor.
Application of High Speed Machining Technology in Modern Die Manufacture
Authors: Cui Qiu Yue , Dong Xue Ren , Ma Yu Zhen , Liu Tong Hui
Published: July 2014

With the continuous progress and development of die industry, the traditional die processing has been unable to meet the current needs of society in the quality and quantity of production. Therefore, die manufacturing industry has improved its processing technology, and then high speed machining technology for dies emerges as the times require. The paper summarizes the elaborations of the characteristics of modern die manufacturing and the advantages of high speed cutting die, and the key technologies of high speed machining technology in die manufacturing are also introduced. Thus the paper illustrates that high speed machining technology is an important development direction of the current die processing.
Research on Wear Surface Morphology of PCBN Tools in High-Speed Machining Valve Seat Insert
Authors: Ding Zhi , Han Jiang , Yang Hai Dong
Published: July 2014

A series of experiments was conducted in high speed dry turning of valve seat insert with PCBN cutters. The main tool wear surface morphology was observed by utilizing scanning electron microscopy and digital microscope. The experimental results indicate that the tool wear surface morphology is rake face wear, flank wear, chipping, flaking and breakage.
Investigation of Tool-Wear and Surface Roughness in Turning Ti6Al4V under Different Cooling Lubrication Conditions
Authors: Wang Teng Da , Liu Er Liang , Li Zhen , Ju Hong Yan , Zheng Yong Chun
Published: July 2014

In titanium alloy machining, under different cooling lubrication conditions, the variation of tool wear and chip morphology have a certain effect on the surface roughness. Under different cooling lubrication conditions, in order to analyze the variation of tool wear, chip morphology and surface roughness, the surface roughness values are measured ​​and the variation in tool wear and chip morphology are observed, and then the interaction relationship between the tool wear and the chip morphology is analyzed. The results show that the tool wear and chip morphology influence on the surface roughness. Under different cooling lubrication, the rake face wear do not change significantly, but wet cooling and MQL play a protective role for the flank face wear.
Research on Tool Wear of PCD Micro End Mill in Machining of ZrO2 Ceramics
Authors: Wang Shu Long , Li Liang , He Ning , Bian Rong , Zhan Zhong Bo , Liu Jing Yu
Published: July 2014

This paper presents a study on the tool wear of micro PCD end mill when machining ZrO2 ceramics. The cutting tool used was a self-designed PCD micro end mill with 1 mm in diameter and single flute. Experiments were conducted on a self-developed micro-milling machine tool. The tool wear characters and progress during the groove milling has been observed. The cutting force and machining accuracy of the grooves also have been studied. Based on the results, it is found that tool wear is mainly on the bottom surface; the cutting force increases with the progress of tool wear; tool wear also affect the width of machined grooves due to the decrease of effective tool diameter.
Prediction of Cutter-Workpiece Engagement for Five-Axis Ball-End Milling
Authors: Ju Gang Gang , Song Qing Hua , Liu Zhan Qiang
Published: July 2014

Five-axis ball-end milling technology is widely used in many industries such as aerospace, automotive and die-mold for complex surface machining. Despite recent advances in machining technology, productivity in five-axis ball-end milling is still limited due to the high cutting forces and stability. Moreover, cutting forces in machining is determined by extracting the cutter workpiece engagement (CWE) from the in-process workpiece. A discrete boundary representation method is developed. Cutter is firstly divided into disk elements along the tool axis. And in each disk element, boundary representation based exact Boolean method is introduced for extracting complex cutter-workpiece engagements at every cutter location due to its efficiency and speed over other discrete methods. Developed engagement model is proved to calculate complex engagement regions between tool and workpiece efficiently and accurately.
Cutting Force Prediction of Disc Cam Contour Milling
Authors: Guo Pei Quan , Liu Fen , Lai Xiao Li
Published: July 2014

Cutting force equation was established for milling with flat end cutter as feeding in straight-line path by means of discretization method. The model of milling force was conducted based on the manufacturing character of cylindrical surface. The milling force is continual change in manufacturing process, it’s not only influenced by milling parameter, but also related with the shape of cam’s contour. Milling force can result in vibration as machining. Milling force prediction is very useful for manufacturing accuracy control.
Finite Element Simulation on Tool Strength of Rough Turning Cylinder
Authors: Zhai Yuan Sheng , Liu Xian Li , Wang Bao Tao
Published: July 2014

In this paper, numerical simulation method is used to study the turning tool strength by Deform 3D in the process of rough machining high strength steel (2.25Cr-1Mo-0.25V).It mainly studies the effect of the feed rate on the cutting force. At the same time, non-uniform distribution cutting force got from the simulation results is taken as the numerical simulation mechanical load of turning tool blade strength to study the influence of feed rate on the turning tool strength. The simulation results show that: with the feed increasing, the mechanical load that turning tool blade bears increases. The maximum effective stress and displacement of the turning tool blade is also increased.
The Impact of Hardened Steel Milling Surface Structure on Mould Service Load
Authors: Zheng Min Li , Xu Jin Hui , Zhang Wei , Zhang Zhao Xing , Wu Tong
Published: July 2014

Mould surface loading state is one of the most important factors which would affect the mould performance in the course of service. According to the established hardened steel milling surface geometry model, a bending forming numerical simulation of hardened steel milling is conducted, the influence law of service process surface load state is analyzed under machined surface geometry structure which is formed by different milling parameters. The research results show: surface load concentrated area is mainly focusing on mould edge transition and fillet in the course of service; the surface geometry structure has an important influence on the mould service load in the course of service, service load more smaller which is more helpful to improve the mould service performance in the course of service.
Bioactive Film Generation during Titanium Alloy Cutting in Oxygen-Enriched Atmosphere
Authors: Zhang Rui , Wan Yi , Ai Xing , Liu Zhan Qiang
Published: July 2014

The oxide film on implant surface of biomedical titanium alloy is crucial to its bioactivity and biocompatibility in human body. A new method is proposed to obtain titanium oxide film by cutting process in oxygen-enriched atmosphere. A gas mixing system is firstly developed to provide oxygen-argon mixed gas to the flank face of insert during turning. The results show that oxygen-enriched atmosphere promote the oxidation reaction of titanium element. Thicker oxide film can be obtained in oxygen-enriched condition than that in natural atmosphere. The corrosion resistance is also improved significantly by this method in electrochemical test.
Simulation of Machining of Incoloy 907 Based on Thermodynamics
Authors: Shao Fang , Wang Yu Ting , Zou Li Jing , Zhang Xian Ming , Ji Bin
Published: July 2014

Aero-engine alloys (also as known as superalloys) are known as difficult-to-machine materials, especially at higher cutting speeds, due to their several inherent properties such as low thermal conductivity and their high reactivity with cutting tool materials. In this paper a finite element analysis (FEA) of machining for Incoloy907 is presented. In particular, the thermodynamical constitutitve equation (T-C-E) in FEA is applied for both workpiece material and tool material. Cutting temperature and cutting force are predicted. The comparison between the predicted and experimental cutting temperature and cutting force are presented and discussed. The results indicated that a good prediction accuracy of both principal cutting temperature and cutting force can be achieved by the method of FEA with thermodynamical constitutitve equation. Keywords: Incoloy907,Simulation, Thermodynamical constitutitve equation
Research on Automatic Nesting Algorithm Based on Heuristic Search
Authors: Zhou Liang , Hou Feng , Kong De Zhi , Tang Liu
Published: July 2014

This paper proposed an algorithm called “Revolution-Rotation” for two-dimensional irregular leather nesting based on heuristic search. The algorithm simplified the process of searching, constructing an evaluation system which evaluates by the center of gravity of the leather to meet the demands of actual requirement. The nesting test shows that the balance of material utilization and efficiency can be controlled by the adjustment of research parameter.
Cutting Performance of Diamond Coated, TiAlN Coated and Carbide Cutting Tools in High Speed Milling Graphite
Authors: Zhou Yu Hai , Wang Cheng Yong , Wang Qi Ming
Published: July 2014

This paper focusing on cutting performance high speed milling Electrical Discharging Machining (EDM) graphite with diamond coated、Carbide (WC) and TiAlN coated cutting Tools. tools wear, cutting force and machined surface had been researched. Experiment study including cutting speed, feed rate per tooth, radial depth of cut, axial depth of cut, and material of tools factors effects on the cutting forces. Cutting parameters are optimized based on the orthogonal experiment. Experiment in high speed milling with diamond coated tools all comparison with TiAlN coated and Carbide (WC) tools. On the surface quality, cutting forces and tool wear influence graphite cutting tool materials research, process parameters, tool design and optimization of processing parameters to provide supportive data. The minimum cutting force as the goal, through the orthogonal experiment for the optimization of cutting parameters obtained for the high speed milling graphite with diamond-coated tool: cutting force 360m/min,feed per tooth 0.15mm/z, radial depth of cut 0.9mm, axial depth of 9mm.
NC Wedge-Caulking Special Machine Tool Design
Authors: Wang Yu Qing , Wang Shi Gang
Published: July 2014

With mechanical processing requirements' development direction translates to highprecision, high efficiency, high quality, intelligence and specialty etc. Wedge-caulking's processinghas a lot of problems in our country energy industry market , the problems mainly show lowefficiency, poor accuracy, product quality and technical indicators are difficult to guarantee. Thispaper developed a high precision, high efficiency, intelligence, high quality and specialty machinetool, the enterprise practice results show that the NC wedge-caulking special machine tool provide thetechnical support and equipment protection for our country motor manufacturing. It has the very goodpractical value.
Research on Surface Roughness of Slender Shaft in Ultrasonic Vibration Turning
Authors: Yang Liang , Sun Lei , Xu Li
Published: July 2014

According to the principle of ultrasonic vibration turning, the first step is to study different position changes of surface roughness with cutting parameters under ultrasonic vibration turning of slender shaft by the test of single factor, and determining the extreme position of surface roughness with the slender shaft changes in different cutting conditions. The second step is to study the influence of cutting parameters on the overall average surface roughness of work piece under ultrasonic vibration turning of slender shaft by orthogonal test design, and compared with the conventional turning. The experimental results show that ultrasonic vibration turning slender shaft processing can significantly improve the surface roughness. At the same time, the influence laws of cutting parameters on the surface roughness are investigated, and finding out the optimal cutting experimental parameters. Key words: slender shaft; ultrasonic vibration turning; surface roughness; orthogonal test design.
Present Situation and Prospect of Residual Stress Modelling Technology in Metal Cutting
Authors: Zhang Wei , Cheng Xiao Liang , Zheng Min Li , Zhang Zhao Xing , Wang Shu Qi
Published: July 2014

Residual stress ,with the branch of type, size and direction, is defined as the stress state which exists in a body after all the external loads are removed [1].According to the mutual influence scope size,residual stress can be divided into macroscopic residual stress and micro residual stress. Cutting residual stress is mainly caused by mechanical stress, thermal stress and phase transformation.
The Performance and Cutting Parameters Optimization in Milling of Nickel Base Superalloy FGH97
Authors: Liu Tong Hui , Guo Pei Quan , Qiao Yang , Cui Qiu Yue
Published: July 2014

The powder preparation, material properties, the cutting characteristics and parameter selection for a nickel base superalloy FGH97 are summarized in this paper. It introduces the influence of various elements on the properties of the alloy, the ideal tool materials is coated cemented carbide tool and PCBN ceramic cutting tool. Generally we can choose the rake angle of 0°~10°, clearance angle of 6°~12°, cutting edge angle of 30°~60°, distortion angle of 0.5°~3°, tool cutting edge inclination angle of-10°~-20°. The optimal parameters for machining superalloy is axial cutting depth (range from 0.15~0.20mm), radial cutting depth (range from 10~20mm), the cutting speed (range from 40~60m/min), feed per tooth (range from 0.08~0.10mm/z).
Process Parameters Optimization and Tool Performance Analysis for Flank Milling Titanium Blisk
Authors: Cheng Yao Nan , Zuo Dian Ge , Zhang Yue , An Shuo , Li Yu Fu
Published: July 2014

In this paper, titanium as the research object, which is usually used as the aerospace engine blisk manufacturing materials, as a typical difficult-to-machine materials, on the basis of its machinability is analysis, research process bisk processing of the main types of flank milling, flank milling fundamental experiments of titanium was carried out, the cutting force of the processing is collected and analyzed in order to optimize the process parameters; Studying ball end mill for the stress analysis and modal analysis in order to obtain the stress, strain and distribution of vibrations in the flank milling titanium, which can provide a reference for future flank milling process parameters titanium blisk, and provide theoretical basis for efficient, stable and safe cutting and optimization tool design.
Study of the Sensitivity of Surface Topography on the Dynamic Milling Force near the Joint of Mold
Authors: Li Rong Yi , Liu Xian Li , Song Sheng Gang , Jiang Yan Cui
Published: July 2014

Most large covering parts mold use panel board type joining together of hardened steel. The vibration and the milling force is more bigger when milling process the spell near joint. They affect spell near joint processing quality. Analyze of the dynamic milling force, vibration surface morphology change of the sensitivity of the joining together with the cross-correlation function for analyzing the sensitivity of the dynamic milling force of mold spell near joint surface morphology. Experimental study shows that the dynamic milling force and the surface morphology characteristic curve cross-correlation function absolute value can reach 0.952 when the tool path and splice joints into 90°.And the cross-correlation function absolute value of milling force and the surface morphology characteristic is larger than vibration signal one. When the tool path and the joint Angle is small, the milling force influence on the surface morphology is lesser, so process should try to choose the smaller Angle seam.
Micro Ball End Milling of Nickel-Based Alloy for Laval Nozzle
Authors: Cai Yu Kui , Liu Zhan Qiang
Published: July 2014

The performance of the micro nozzle is determined primarily by its machined surface topology and geometric profile. A circular cross-section micro-Laval nozzle is modeled and studied by using numerical simulation in this paper. The real residual height and residual area of machined nozzle surface with ball-end milling cutter are proposed. A micro-Laval nozzle was machined successfully. It is found that the ball end milling cutter with large radius is suitable for finishing operations in the viewpoint of nozzle performance. Moreover, the serial process of drilling and milling has been proved by experiments with which both high-level machining accuracy and performance can meet the nozzle requirement.
Treatment of lateral periodontal cyst with guided tissue regeneration
Authors: Meseli Suleyman Emre , Agrali Omer Birkan , Peker Onder , Kuru Leyla
Published: July 2014

Lateral periodontal cyst (LPC), originated from epithelial rests in the periodontal ligament, is a noninflammatory cyst on the lateral surface of the root of a vital tooth. LPC is generally asymptomatic and presents a round or oval uniform lucency with well-defined borders radiographically. In this case report, clinical, histological and radiographical findings and periodontal treatment of 32-year-old female patient, who was referred to Department of Periodontology Clinic of Faculty of Dentistry, Marmara University with a painless hyperplastic lesion on the distobuccal site of the tooth number 12, were presented. The tooth number 12 was vital and a well-defined round radiolucent area with corticated borders was determined radiographically. Preliminary diagnosis was LPC based on clinical and radiographical findings. Mechanical periodontal treatment consisted of oral hygiene instructions, scaling and root planing was applied and flap operation was performed to gain access to the lesion. Following enucleation of the lesion, alveolar bone destruction shaped as a tunnel from labial to palatinal site was observed. The bone cavity was grafted with bovine-derived xenograft, followed by placement of a resorbable collagen membrane. Tissues removed from of the lesion were examined histologically. Hematoxylen-eosin stained sections showed vasculature granulomatous structure underlying squamous epithelium, and destructed bone spaces, all of which were consisted with LPC. Acceptable clinical healing was achieved at 6 months follow-up period. Satisfactory clinical and radiographical outcome can be achieved in the treatment of LPC using regenerative periodontal approach.