bluuebunny/crossref_metadata_2025 huggingface dataset:
A Design of Mini Actuator for Compact Camera without Using Permanent Magnet
Authors: Tsai Ching Lung , Liaw Der Cherng
Published: July 2014

This paper presents a design of mini actuator without using permanent magnet for auto-focus (AF) compact camera module (CCM) built on mobile phone, tablet PC and notebook. The current through the coils of electromagnets will yield magnetic force to move the moving part up and down. Comparing with conventional spring-type voice coil motor (VCM) and non-spring type VCM, the proposed actuator eliminates the concerns of rare earth supply and magnetic flux leakage which can fail the function of magnetic flux sensitive device such as e-compass. The proposed actuator also simplifies the power converter design from bipolar scheme as required by conventional non-spring type VCM to unipolar. A comprehensive electromagnetic analysis is performed by using finite element method to characterize the performance of the proposed actuator. Numerical simulations demonstrate that the magnetic flux leakage in the proposed actuator is much smaller than those by conventional design.
Influence Characteristics of Shaft and Disk Models on Natural Frequency of Single-Rotor System
Authors: Lin Xi Chen , Zhou Rui Ping , Xiao Neng Qi
Published: July 2014

From the calculation method of natural frequency of single-rotor system whirling vibration, this article puts forward corresponding dynamic equations. Several modeling of single-rotor system are established, with different numbers of shaft elements, relative number of degrees of freedom, four types of modeling the shaft and disk interface. Error and accuracy of natural frequency are analyzed with modeling properties. The above all mentioned results make it possible to summary influence characteristics of modeling for rotor system.
Study on Hydraulic System for Full Hybrid Transmission
Authors: Han Ying
Published: July 2014

Design method of hydraulic system of full hybrid transmission was analyzed. At first, oil volume flow and pressure requirement was confirmed according to the vehicle control strategy. Mechanical gear pump and electric pump were used to supply oil flow for all driving modes. Self-adapted pressure regulation circuit was designed to supply high pressure oil for brake engagement. Structure dimension of valves and cooling orifices was designed by theoretical calculation. Cooling flow can be distributed proportionally among electric motors and planetary gears.
The Analyses of the Critical Speed and Unbalance Response in the Rotor System
Authors: Liu Jun Li , Hao Zong Rui , Xu Juan , Meng Qing Ming
Published: July 2014

Linear finite element analysis model of the typical rotor system is established by the finite element method. Considering the gyroscopic effect of the rotor, critical speed in the rotor system is solved. Then the effect of the rotor system by the unbalanced force on dynamic characteristic is analyzed by frequency response curve. The result shows that support damping coefficient has a great effect on critical speed in the rotor system. With the support from rigid support to elastic support, the critical speed greatly reduces. Because of the unbalance exciting force, maximum resonance amplitude of the disk is near the critical speed of the rotor.
Unsaturated Polyesters as Stamps for Hot Embossing of Micropumps
Authors: Hsu Yi Chu , Cheng Po Yuan , Lee Hsiao Wei , Su Shun Fua
Published: July 2014

We investigated two processes to fabricate unsaturated polyesters, UP, to serve as a stamp to emboss a microfluidic chip to apply to a peristaltic micropump. The mechanical properties of UP are great to apply to vibration type micro-actuators. However, it’s rarely discussed academically. As a result, we proposed two processes developed and compared macro-and micro-scopically. It was first observed that process I of traditional UP curing process and process II of modified process can both replicate the geometries of microfludic chips well macroscopically. In addition, the former one has macroscopic defaults like cracks, bend, and separation between vessel and UP molds, while the latter one doesn’t. Optical microscope and confocal microscope are also applied to verify the replication effects microscopically. Again, both processes illustrate good replication results with variation of both lengths and areas all less than 10%, while process II has better geometries and lower deviation on different sites. The process I was proven that the averages of depth and widest width change rates for replication are-1.06% (between-4.15% and 2.89%) and-2.77% (between-6.93% and 0.67%), respectively. And, the replication results of process II shows also reasonable change and even smaller deviations that the averages of depth and widest width change rates are-4.77% (between-6.33% and-3.84%) and 1.53% (between 1.15% and 2.15%), respectively.
The Optimization Model of in Job-Shop Scheduling Problem with Alternative Machines Based on Improved Genetic Algorithm
Authors: Chi Qing , Fu Xiu Li , Pan Ya Nan , An Zeng Hui
Published: July 2014

The job-shop scheduling problem with alternative machines is very complicated and hard to simplify during product management system for discrete manufacturing enterprise. According to the integrated constraint condition of the processing technology and equipment resources, an optimization model for the dispatch plan of processing technology for the gear shaft assembly is analyzed and established in this paper. Furthermore, the optimization results for the process sequence planning of the gear shaft assembly are obtained by iterative algorithm and improved genetic algorithms approach. The calculating program of optimization layout is developed by Matlab. The optimization results show that the production cycle time and operating cost is reduced remarkably and the efficiency is also improved. Through analysis and verification, it is optimal and feasible for discrete manufacturing enterprise in engineering applications.
Research on the Fault Characteristic Extraction of Hydropower Units Based on Hilbert-Huang Transform
Authors: Zhang Yu Quan , Zhu Yan Tao , Zheng Yuan , Feng Yuan , Ge Xin Feng , Tian Xiao Qing
Published: July 2014

In order to effectively extract nonstationary and nonlinear fault signature of hydropower units’ signals, a new method, based on Hilbert–Huang transform (HHT), is proposed. This method is used to carry out EMD (Empirical Mode Decomposition) analysis and Hilbert transform of signals firstly and then extract Hilbert spectrum to provide a basis for signal feature extraction. The vibration signal of upper brackets in hydropower units has been put forward with experimental analysis. The results suggest that the EMD can decompose vibration components in different frequency domain, which has intuitive physical meaning. Moreover, Hilbert spectrum also has a good resolution in time domain and frequency domain. Thus, HHT can be used to depict the fault signals effectively and lay the foundation of the fault pattern recognition.
Review on Visibility Monitoring in Expressway under Foggy Condition
Authors: Zhu Long Biao , Wang Jie , Huang Xi , Wang Heng , Liu Peng
Published: July 2014

Visibility monitoring under foggy condition is very essential to traffic safety on expressway. The definition and influence factor of visibility are summarized. The main advantages and disadvantages of three common methods- transmission method, scattering method, digital imaging method and related visibility meters are analyzed and compared here. The domestic and foreign status and trends of visibility research on foggy expressway are mainly introduced from thick fog forecast, warning and monitoring system, visibility detection device. Aiming at the existing problems of visibility monitoring in expressway, some suggestions for improvement are put forward at last.
Safety Margin Characterization for In-Service Pressure Vessels Containing Crack Defects
Authors: Lin Si Jian , Long Wei , Tian Da Qing
Published: July 2014

It’s significant and necessary to assess the safety of the in-service pressure vessels containing crack defects, and there are so many methods that can do, for example, the finite element method and probabilistic fracture mechanics assessment method. However, knowing the safety of the pressure vessels containing crack defects is not enough. For the residual lifetime reason, we are eager to get the safety margin of the pressure vessels. That is how secure they are. Aiming at this problem, we put forward the concept of failure path based on the Failure Assessment Diagram (FAD) and fracture mechanics to help to characterize safety margin. Facts proved that this method was original and useful which can provide a new way in solving the residual lifetime assessment problem of the in-service pressure vessels containing crack defects.
Module Similarity Measure Method of Products Based on Assembly Relationship
Authors: Chen Yan Hui , Zhou De Jian , Wu Zhao Hua
Published: July 2014

A module similarity measure method of the mechanical and electrical products is studied in this paper. First this paper proposes the module assembly type coding method and network modeling method, and establishes its weighted network model by taking typical module as an example; then it studies the assembly relationship similarity, node similarity and network similarity; finally it provides the module similarity measure method based on the assembly relationship.
Seismic Response Analysis of Large-Scale Site with Circular Diaphragm Wall
Authors: Zhang Ru Lin , Yang Wen Dong , Sun Feng
Published: July 2014

The seismic response analysis of project soil site is important to obtain the ground motion parameters for seismic design of upper structures. First, a simplified solving method is introduced, in which, the horizontal seismic loadings are expanded into Fourier series in the circumferential direction, using the orthogonality between the normal and tangential direction on the circumference, the three-dimensional problem is reduced to a series of two-dimensional problems. Then, the simplified method is used for seismic response analysis of a practical large-scale soil site with large diameter circular diaphragm wall. The influence of wall to the site is obtained through two field conditions, which are wall field and free field (without wall). Compare with the results of the site without wall, the peak acceleration of the pit bottom is increased owing to the confinement effect of wall, and the influence to ground surface far from the wall is very little.
Fault Diagnosis for CNC Machine Tool Based on Mapping Model
Authors: Sheng Bo , Deng Chao , Xiong Yao , Luo Zhi Jun , Wang Yuan Hang
Published: July 2014

Since numerous parts and various faults of CNC machine tool, the mapping model is proposed to represent the complex relationship between faults. Then some matrices are used to process the mappings model. Finally, the priority of the fault sources is sorted by the fault localization algorithm based on the matrix above. Besides, the case of ram feed system of CNC boring machine tools FB260 illustrates the performance of mapping model based on fault diagnosis.
A Case Study of the Link between Virtual and Physical Prototyping in Servo-Pneumatic System
Authors: Pratumsuwan Pornjit , Nunthavarawong Peerawatt , Junchangpood Aphaiwong
Published: July 2014

This paper presents a link between virtual and physical prototyping which was applied to the servo-pneumatic system. The development began with the study and design. Next, virtual prototyping, this stage is the integration of aided design, programming design, and simulation design to demonstration the functionality of the virtual servo-pneumatic prototype in a computer environment. After that, the virtual prototype which is verified and optimized to be used a physical prototyping. Finally, links the two together, this link represents be a human-machine interface system. The experimental results were satisfactory. Thus, may be said that this is both to enhance of the performance and efficiency of prototyping in current mechatronics system.
A Novel 3-DOF Parallel Robot and its Kinematic Analysis
Authors: Liu Xiao Bo , Yuan Xiao Dong , Wei Xiao Feng , Ni Wei
Published: July 2014

This paper deals with the design and analysis of a novel and simple two-translation and one-rotation (3 degrees of freedom, 3-dof) mechanism for alignment. Firstly, degree of freedom of the parallel robot is solved based on the theory of screw. Secondly considering the demand of motion control, we have conducted the analysis on the 3-dof parallel robot, which includes inverse displacement, forward displacement, and simulation based on SolidWorks Motion. The simulation results indicate that the novel 3-dof robot is suitable for performing the required operations.
Research on Compiled-Type Numerical Control System and its Data Compression Technology
Authors: Wang Kun Yang , Yao Ying Xue , Zhou Liang
Published: July 2014

A compiled-type numerical control system based on asynchronous operating mode was proposed. The system constitutes of data center, motion control cards and communication system, solving the contradiction between real-time and openness property. The architecture and work procedure of the system were illustrated. According to the features of system that are large amount of data transmission, high transmission speed requirements and numerous connected devices, data compression technology of NC system was studied. LZW compression algorithm was chosen after contrast, and compression based on PC software was implemented in data center while decompression based on FPGA hardware being implemented in motion control cards. The simulation and experiment results show that data compression ratio could be under 10%, compression and decompression speed are fast and system requirements are satisfied.
Comparison between Waveform and Bug Path Planning Algorithm for Mobile Robot
Authors: Tang Swee Ho , Yeong Che Fai , Su Eileen Lee Ming
Published: July 2014

Mobile robots frequently find themselves in a circumstance where they need to find a trajectory to another position in their environment, subject to constraints postured by obstacles and the capabilities of the robot itself. This study compared path planning algorithms for mobile robots to move efficiently in a collision free grid based static environment. Two algorithms have been selected to do the comparison namely wavefront algorithm and bug algorithm. The wavefront algorithm involves a breadth-first search of the graph beginning at the goal position until it reaches the start position. The bug algorithm uses obstacles borders as guidance toward a goal with restricted details about the environment. The algorithms are compared in terms of parameters such as execution time of the algorithm and planned path length by using Player/Stage simulation software. Results shown that wavefront algorithm is a better path planning algorithm compared to bug algorithm in static environment.
Comparison between Normal Waveform and Modified Wavefront Path Planning Algorithm for Mobile Robot
Authors: Tang Swee Ho , Yeong Che Fai , Su Eileen Lee Ming
Published: July 2014

Mobile robot path planning is about finding a movement from one position to another without collision. The wavefront is typically used for path planning jobs and appreciated for its efficiency, but it needs full wave expansion which takes significant amount of time and process in large scale environment. This study compared wavefront algorithm and modified wavefront algorithm for mobile robots to move efficiently in a collision free grid based static environment. The algorithms are compared in regards to parameters such as execution time of the algorithm and planned path length which is carried out using Player/Stage simulation software. Results revealed that modified wavefront algorithm is a much better path planning algorithm compared to normal wavefront algorithm in static environment.
Molecular Sieve Valve Control System Based on DCS
Authors: Yin Qing , Sun Tao , Meng Ting Ting
Published: July 2014

The air separation part aims to clean up the air and separate air, it provides the demand gas for the factory. This process is automatically controlled by the progress which we code. The operating time and the valves reaction at each stage have strict requirements. If the operating time fails to meet requirements or the valve operations are improper, it will make the index of the air separation failed. Thus it will cause the whole process interruption and cause huge losses. Therefore, we must ensure that each valve operation of molecular sieve can be effectively controlled and monitored.
Dynamic Propagation Problems Concerning Symmetrical Mode III Interface Crack of Aluminum Alloys
Authors: Lü Nian Chun , Xiang Qian , Hao Guo Dong , Wang Yun Tao
Published: July 2014

By application of the theory of complex variable functions, dynamic propagation problems concerning symmetrical mode III interface crack of Aluminum alloys were investigated. The problems dealt with can be very facilely translated into Riemann-Hilbert problem by the approaches of self-similar functions, and the universal representations of analytical solutions of the stresses, displacements and dynamic stress intensity factors for the surfaces of symmetrical mode III interface crack subjected to motive increasing loadings Pt5/x5 and Px6/t5 were attained, respectively. After those solutions were utilized by superposition principle, the solutions of discretionally complicated problems could be easily acquired.
Low Cost Sensor Data Fusion in Omnidirectional Mobile Robot Feedback System to Improve the Navigation Accuracy
Authors: Tey Wei Kang , Yeong Che Fai , Seow Yip Loon , Su Eileen Lee Ming , Tang Swee Ho
Published: July 2014

Omnidirectional mobile robot has gained popularity among researchers. However, omnidirectional mobile robot is rarely been applied in industry field especially in the factory which is relatively more dynamic than normal research setting condition. Hence, it is very important to have a stable yet reliable feedback system to allow a more efficient and better performance controller on the robot. In order to ensure the reliability of the robot, many of the researchers use high cost solution in the feedback of the robot. For example, there are researchers use global camera as feedback. This solution has increases the cost of the robot setup fee to a relatively high amount. The setup system is also hard to modify and lack of flexibility. In this paper, a novel sensor fusion technique is proposed and the result is discussed.
Electro-Hydraulic Servo Actuator Parameters Self-Tuning Three-Dimensional Fuzzy Control Research
Authors: Wang Xin Ge , Li Lei , Han Hui Ling , Wei Xiu Ling , An Mao Dian , Liu Bing Feng
Published: July 2014

According to the different working state of electro-hydraulic servo actuator servo system, the design parameter self-tuning three-dimensional fuzzy controller, the automatic setting of three-dimensional fuzzy controller quantization factor and scaling factor, enhance the adaptability of fuzzy control system and tracking performance, and improve the quickness of electro-hydraulic servo actuator servo system, reduce the overshoot, the rapidity and precision meet the electro-hydraulic servo actuator control servo system dynamic performance and static performance requirements.
1.Parameter self-tuning three-dimensional fuzzy controller scheme
The Estimation of Reliability Function in Terms of the Catastrophe Theory
Authors: Pitukhin Aleksandr Vasilyevich , Skobtsov Igor
Published: July 2014

The development of new catastrophe theory methods, coupled with probability theory is opening new possibilities to estimate the reliability measures. A brief review of the cusp catastrophe is presented in the introduction. The second part is devoted to probability approach. Manage variables are viewed as stationary random processes (functions) and a problem of overshoot of random function is formulated. Mean number of zero crossings by Gaussian random stationary process is evaluated; analytical equations to estimate the reliability function are obtained.
The Design and Implementation of PDM System for Small and Medium Enterprises
Authors: Lin Hong
Published: July 2014

PDM technology is an indispensable tool for enterprise information integration .Analyses problems of current product data management for small and medium enterprises (SME). A system architecture based on C/S and B/S is put forwarded .Workflow technology based on database is adopted for workflow management .An integration design based on single source of interface database is adopted to realize the integration of current application .This system gives room for advance toward internet. An example is used to show the implementation of PDM system.
Mixing and Characterisation of Stainless Steel 316L Feedstock for Waste Polystyrene Binder System in Metal Injection Molding (MIM)
Authors: Asmawi Rosli , Ibrahim Mohd Halim Irwan , Amin Azriszul Mohd
Published: July 2014

This paper describes the mixing process and homogeneity analysis of a newly developed binder system based on waste polystyrene (PS) and palm kernel oil (PKO) to produce feedstock for metal injection molding (MIM). Since mixing is a critical step in MIM process, hence the mixture of powder and binder should be homogeneous and injectable. In this study, water atomised Stainless Steel powder was mixed with a new binder system consisting of waste polystyrene and palm kernel oil in a Brabender Plastograph EC rotary mixer. Several tests were performed to assess the homogeneity of the feedstock that was produced at 60 vol.% powder loadings. The 60 vol.% was chosen because the Critical Powder Volume Concentration (CPVC) of the SS316L powder was found to be 64.8 vol.%. The tests conducted were density, binder burn-out and SEM morphology observation. It was found that the feedstock shows good homogeneity and suitable for further processing in MIM.
Summary of and Lessons from Domestic and Overseas Setting of Truck Escape Ramp
Authors: Wu Ke Man , Hou De Zao , Zhong Lian De , Li Chang Cheng , Tang Jun Jun
Published: July 2014

Setting condition and setting location of truck escape ramps in the USA, New Zealand, South Africa, Britain, Australia and China are analyzed in detail and summarized in this paper, it is found that more comprehensive consideration is made in the USA, and it is considered that the function of quantitative analysis for setting the location of truck escape ramp is limited. Finally, clauses and clause explanations which can be adopted in standards and regulations for domestic transportation industry are formed.
Comparison Study of Multi-Layer and Folding Liners of Corrugated Cartons - Domestic Ceramic Packaging
Authors: Xiao Ying Zhe , Hao Xi Hai
Published: July 2014

Corrugated board is a kind of important material for packaging liner. According to packages of ceramic wine suits and single ceramic bowl, we designed folding liners and multi-layer liners using corrugated boards. Experiments are taken out to compare mechanical properties of different liner structures. Best corrugated liner forms are summarized considering amount of corrugated boards, mechanical properties, convenience in manufacturing, and convenience in using.
The Development of Bicycle into Trandem: The Bike Can Be Used as Tandem or Single Depend of the Necessity
Authors: Iskandriawan Bambang , Jatmiko
Published: July 2014

The issue of traffic jam in Indonesia’s big cities alike in Jakarta, Bandung, Medan, Makassar and Surabaya encourage the government, civilization and transportation expert initiate to consider a elucidation to solve the problematic above. The growing of the vehicle number which is extended faster than the establishment of road affect the bottleneck could not to be avoided. Furthermore the pollution problem which is produced by car exhaust where the number of them always increase each year make the air pollution in the settlement becomes crucial. Additionally within the backwards issue of the reducing of the using of fuel because of the source of them become limited. People have to consider sincerely before buying the vehicle due to the high operational cost. One of the solutions of the problem is the using of human power vehicle asThe study try to respond the need of people to enjoy the using of tandem bike but also still could be used as the single bike more over the storage problem is disappear. The research team agrees to give the name of this ‘novel bike’ as Trandem: the existing tandem bike which is transform to the dual function.
Intelligent Quilt Based on Conductive Textile Materials, Smart Flexible Sensors, and Composite Charging Technology
Authors: Li Jin Liang , Zhu Li Ping
Published: July 2014

In this paper, domestic and foreign progress and some of the results obtained in the field of conductive textile research are introduced. An intelligent quilt concept is conceived. The intelligent quilt is made from natural plant improved by genetic technology. It has certain “conductivity”, which is not necessarily the true current conduction, but may be the conduction of some weak “unique signal” sent out by some specially bred textile fibers organization. The research results of flexible sensor are applied to trace gas detection in the intelligent quilt. Also, new energy supply strategy with combination of. Bioenergy technologies and other energy are employed. The proposed intelligent quilt may be applied to the monitoring biochemical and autonomic parameters of the human body and provide helpful suggestions on people’s health status.
Research on the Single-Model Stochastic Assembly Line Balancing Problems of Type-1: A Task-Oriented Enumerative Algorithm
Authors: Zhang Han Ye , Liu Hai Jiang , Chen Li Yun , Li Ling Yu
Published: July 2014

In this paper, the optimal assembly sequence is considered as precedence graph which reduces the complexity of the problem, and an exact algorithm named task-oriented enumeration is proposed to solve the single-model stochastic assembly line balancing problems of type-1. The results show the proposed algorithm can solve the single-model stochastic assembly line balancing problems of type-1.
The Application of Tissue Engineering and Biological Materials on Exercise-Induced Meniscus Injury
Authors: Zhang Lei , Zhao Zhi Qiang , Miao Xiao Liang , Zhuang Hong Mei
Published: July 2014

The development of tissue engineering provides a new way for the repair and reconstruction of meniscal injury. Using this technology to build a functional meniscus in the prevention of complications after meniscectomy has important significance. Because of the blood supply characteristics of the meniscus, meniscal injury caused no blood flow region do not have the ability to heal. The development of tissue engineering provides a new way for the repair and reconstruction of meniscal injury. The repair of meniscal scaffold materials more reports mainly include natural biological materials, synthetic materials, nanomaterials etc. The study of tissue engineering meniscus has achieved initial results, but are in the experimental stage of the scaffold material, there is no an ideal material. Therefore, the search for a good cell compatibility, controllable degradation rate and hot research has certain mechanical strength of scaffold materials is still the meniscus tissue engineering.
Research on Electrical Engineering with a New Fault Location Method of Double Terminal Based on HHT
Authors: Lu Jian Xu , Ma Cheng Jia
Published: July 2014

Among the available fault location methods based on traveling waves, calibrations of wave velocity and wave arrival time are the two main problems. This paper proposes a new fault location method which combines the two problems mentioned above. In this method, the first wave and second wave obtained at one side and the first wave obtained at the other side is used to locate the fault point. And the Hilbert-Huang transform is used in the calibration of wave arrival time, making the method more accurate than using wavelet transform. This method has the following two advantages: At first, it dismisses the influence of wave velocity. In the second, it doesn’t need to distinguish the sources of the received waves. ATP-EMTP’s simulation results show that this method is available and the location precision is higher than traditional fault location methods.
Zero Crossing Point Phase Detector Simulation Based on PROTEUS
Authors: Su Wei Yi , Li Guang
Published: July 2014

This paper designed a kind of phase D-value measuring system based on microchip MCU, which adopted the multi-cycles measuring algorithm to improve the accuracy. This system used the zero crossing point phase detector, hardware and software passed the computer simulation based on PROTEUS and MPLAB, the measuring accuracy satisfied the design requirements, this design thought was successfully applied to smart grid access devices. The simulation and practical results show that compared with the traditional products, the phase D-value measuring system based on microchip MCU has a simple circuit, low power consumption, good real-time, high precision and a wide range of applications, it is easy to implement. In the actual product development, the use of assembly language programming has the better effect than c language programming, and the physical simulation is superior to the software simulation.
The Improvement of Data Acquisition System in Computerized Well Logging Equipment
Authors: Li Gang , Pan He Ping , Fang Si Nan
Published: July 2014

Computerized well logging equipment plays an important role in petroleum exploration and production, and data acquisition system is the core of it. In order to improve the acquisition systems which are used in some oil fields in recent years, a new design of data acquisition system is introduced. The ARM embedded chip and the FPGA chip are the kernel chips of the data acquisition system, and the Ethernet is the communication medium between the cards of the data acquisition system and the host computer of the numerical controlled well logging system. This data acquisition system has more integrated level and communication speed higher than the others of same kind.
Research on Controlling and Management Measures with Engineering Technology in Freeway Construction Project
Authors: Yin Hai Ping , Li Gao , Li Sheng
Published: July 2014

Based on the study on the recent years construction of freeway,the paper figures out the engineering technology quality control on constructing spot.The engineering technology quality control on constructing spot include:quality thinking,building construction site lab,checking on spot,encouragement and punishment,and so on.
Design of a New Image Processing System Based on FPGA
Authors: Li Qi , Yang Yu , Li Zhong Ke , Lu Jing
Published: July 2014

According to the unmanned aerial vehicles real-time video image acquiring and target detection requirements, an image processing system was designed based on FPGA and TVP5150A decoder, and the video decoding hardware and software was also designed to meet the demands of unmanned aerial vehicles. An I2C controller was realized to assure the implementation of video decoding process in accordance with the requirements, and an image processing algorithm and applied to the image recognition process. Both of these were completed in FPGA using verilog HDL language. The correction of this image processing system was verified through real-time experiments.
Kinetics on the Ultrasonic-Assisted Extraction of Polysaccharides from Limonium bicolor kunze (Bge.)
Authors: Song Xiao , Zhao Peng , Meng Qing Hua , Tang Zhi Shu , Wang Chang Li
Published: July 2014

To explore the kinetics parameters in the ultrasonic-assisted extraction from Limonium bicolor Kunze (Bge.) , the kinetic equation for polysaccharide ultrasonic extraction process was established with ball model. According to Fick’s second law of diffusion, extraction process was analysed. The results can provide the valuable theory basis for the technical design and further research of polysaccharide extraction process.
Research on Photochromic Compounds with Efficient Synthesis and Photochromic Properties of 1-(2-methyl-5-phenyl-3-thienyl)-2-[2-methyl-5-(4-pentylphenyl)-3-thienyl] perfluorocyclopentene
Authors: Song Jun Jie , Liu Gang
Published: July 2014

A novel isomeric photochromic diarylethene, 1-(2-methyl-5-phenyl-3-thienyl)-2-[2-methyl-5-(4-pentylphenyl)-3-thienyl] perfluorocyclopentene, was designed and synthesized. Its fluorescent and photochromic properties were also studied in detail. The compound exhibited excellent photochromism, changing from colorless to bule after irradiation with UV light both in solution and in PMMA film. In addition, the fluorescence intensity of the photochromic diarylethene 1a declined remarkably, when irradiation with UV light.
Synthesis and Properties of 1-[2,5-dimethyl-3-thienyl]-2-[2-methyl-5-(4-pentylphenyl)-3-thienyl] perfluorocyclopentene
Authors: Zhang Cong Cong , Wei Sha Sha , Pu Shou Zhi
Published: July 2014

An unsymmetrical photochromic diarylethene which called 1-[2,5-dimethyl-3-thienyl]-2-[2-methyl-5-(4-pentylphenyl)-3-thienyl] perfluorocyclopentene (1a) was synthesized and its properties such as photochromism and fluorescence in solution as well as in a PMMA film were investigated in detail. The diarylethene has shown good photochromic behavior both in solution and in a PMMA film.
Development of Combined Monitoring System of MOA Insulating Material and CT (Casing Tube) Insulating Material
Authors: Su Ning , Xu Qing Long , Gui Cui Yun
Published: July 2014

Live testing of resistive current of metal oxide arrester (MOA) and on-line monitoring of capacitive current of capacitor voltage transformer or casing tube (CT) are two important parameters for stable and safe operation of power system. The present method is to separately monitor these two types of equipment. Through analyzing equipment structure, monitoring principle, integration mechanism and so on, this article realizes combined measurement of resistive current and capacitive current. Thus, the combined monitoring of metal oxide arrester (MOA), rheology and CT insulation status is achieved.
Pore Structure and Thermal Characteristics of Clay Bricks
Authors: Čáchová Monika , Koňáková Dana , Vejmelková Eva , Keppert Martin , Polozhiy Kirill , Černý Robert
Published: July 2014

Clay brick was perhaps to be the first artificial structural material. First bricks were dried by sun; later people had started to burn bricks by fire and in that time further enhancements appeared. This article deals with two kinds of fired clay bricks; basic physical properties, pore system characteristics and thermal properties are studied. The values of basic physical properties by water vacuum saturation vary slightly; bulk density shows values around 1880 kg/m3 and in the case of open porosity it is around 27%. Regarding thermal properties the difference is higher, obtained results of thermal conductivities in dried state vary by about 33%.
New Type of Lightweight Gypsum-Based Material
Authors: Vimmrová Alena
Published: July 2014

New type of foamed gypsum-based material is described. Lightweight material, prepared from the gypsum as a main binder and hydrated lime as a secondary binder was foamed by the aluminum powder. The materials with the bulk density about 650 kg.m-3, compressive strength about 1 MPa and thermal conductivity 0,22 W.m-1.K-1 were prepared. Basic physical, mechanical, thermal and water vapor properties were investigated.
Influence of Different Mechanical Properties to the Concrete Penetration Resistance
Authors: Vavřiník Tomáš , Zatloukal Jan
Published: July 2014

This paper describes influence of different mechanical properties to the concrete penetration resistance. The resistance is evaluated on the basis of the presented experimental program. In the experiment, non-deformable ogive-nose projectiles with diameter of 7.92 mm and mass of 8 g with impact velocity of about 700 m/s were hitting center of the specimens. Determination of the concrete penetration resistance was than based on projectile residual velocity obtained from high-speed camera record. The specimens were made from high strength concrete, steel fiber-reinforced concrete, ultra-high performance concrete and ultra-high performance fiber-reinforced concrete with different fiber content. The concrete penetration resistance was evaluated on total 32 specimens. Influence of mechanical properties, addition of coarse aggregate and steel fibers were discussed. Mechanical properties of the tested materials were investigated on total 125 specimens. Data from the measurements were used for creation of new RHT concrete models in Autodyn. In order to confirm experiment's setup and results, numerical analysis was performed in Autodyn. Results of the numerical simulations were compared to the experimental program.
Adsorption of Water Vapor in Selected Sandstone Influenced by Different Method of Measurement Using Dynamic Vapor Sorption Device
Authors: Žumár Jaromír , Pavlík Zbyšek
Published: July 2014

In this paper, water vapor adsorption in sandstone is analyzed using different measurement setting of dynamic vapor sorption device. Basic physical properties of tested material are determined. The vapor sorption is measured using different experimental time and dm/dt setting. It is shown that the device setting can influence the results of equilibrium moisture content in high relative humidities, whereas the differences are of about 20%. The measurement also indicates that the difference in hysteresis can be up to 50% for non-equilibrium measured sample compared to the one under equilibrium state. Both measurements are compared with the steady state desiccator method. The sandstone samples containing a certain concentration of inorganic water soluble salt which just only emphasizes the low hygroscopicity of silica grains are studied as well. The measured data can be used in evaluating of results obtained by dynamic vapor sorption device under equilibrium states although the measurement takes significantly longer time.
Effect of Porosity on Mechanical and Hygric Properties of Concrete with Natural Pozzolan Addition
Authors: Kulovaná Tereza , Rovnaníková Pavla , Pavlík Zbyšek , Černý Robert
Published: July 2014

Effect of porosity on mechanical and hygric properties of high performance concrete (HPC) with natural pozzolan as partial Portland cement replacement up to 40% is studied in the paper. The reference HPC mixture is researched as well in order to evaluate the influence of pozzolan usage on concrete performance. For the studied materials, measurement of compressive strength, sorptivity, apparent moisture diffusivity, and water vapor diffusion permeability is done. The obtained data shows that application of the pozzolan as partial cement replacement leads to increase of concrete porosity that is related to the lower mechanical strength and higher moisture transport properties. Therefore, the applied natural pozzolan has a potential to replace a part of Portland cement in concrete manufacturing but its content in concrete mixture has strict limitations.
Restrained Shrinkage Test of High Performance Concrete Ring Specimen
Authors: Zemanová Alena , Sovják Radoslav , Litos Jiri
Published: July 2014

The aim of this study was to quantify the restrained shrinkage of high performance concrete (HPC). Ring test was used for the measurement of restrained shrinkage. Mechanical properties of the HPC as well as free shrinkage were determined for assessment of theoretical stress in shrinkage restrained material. The results from the ring test showed a lot of information about material such as development of actual residual stress, cracking potential, microcracks and relaxation.
Determination of Hygric Properties of Hollow Brick Block as a Function of Moisture Content
Authors: Korecký Tomáš , Jerman Miloš , Černý Robert
Published: July 2014

In the paper is presented calculation of hygric properties of hollow brick block. Namely it is adsorption isotherm, water vapour diffusion resistance factor and moisture diffusivity. The brick block cavities was filled only by air. In first step the properties of brick body were measured. Then the properties of the whole brick block were calculated by using homogenisation techniques.
Production and Use of the Textile Reinforced Concrete
Authors: Vogel Filip
Published: July 2014

This article discusses about the textile reinforced concrete. The textile reinforced concrete is a new material with great possibilities for modern construction. The textile reinforced concrete consists of cement matrix and textile reinforcement of high strength fibers. This combination of cement matrix and textile reinforcement is an innovative combination of materials for use in the construction. The main advantage of the textile reinforced concrete is a high tensile strength and ductile behavior. The textile reinforced concrete is corrosion resistant. With these mechanical properties can be used textile reinforced concrete in modern construction.
Fracture Surface Measurement of Concrete with Respect to Loading Speed
Authors: Mára Michal , Maca Petr
Published: July 2014

Reverse engineering is a specialization which was developed a lot in the 21st century. The major aim is researching and describing the principals and procedures of process and structures. Reverse engineering in civil engineering is used to describe the applied loadings which caused corruption or failure of a structure or it is used to reconstruct 3D models of the original object. The aim of this paper is to compare response to static and impact loading of two materials, i.e. plain concrete and high-performance concrete (HPC), with respect to the fracture surface area. These areas were scanned by the 3D laser scanner and they were evaluated in the graphic programs. The main objective of this paper is a presentation of measured data, which can be used to determine the size of the applied loadings using reverse engineering.
Research on the Wear Process of High Speed Cutting Ni-Based Superalloy
Authors: Zhou Jun , Liu Ming Pu , Sun Hong Qi
Published: July 2014

As the main method of high efficiency cutting Ni-based superalloy, high-speed cutting can not but intensify the cutting-tool wear for the high cutting force and cutting temperature. So, it is very necessary to study the process of cutting-tool wear and wear mechanism, especially, the effect of cutting-tool wear on the cutting force, cutting temperature and surface roughness of machined workpiece. In this paper, investigation of tool wear in high-speed cutting is proposed, the PCDTiAlN carbide insert is used in the experiment, the cutting-tool wear and the corresponding cutting force, cutting temperature and surface roughness of machined workpiece is detected. It indicates that the cutting force, cutting temperature and surface roughness of machined workpiece is changed corresponding the cutting-tool wear,the wear process of coated tool include the coated material wears and base material wears,the wear mechanism is complex. Key word: superalloy, high-speed cutting, tool wear, wear form ; .
Experiment Research on Chips Flying Characteristics for Heavy-Duty Milling
Authors: Qian Jun , Cheng Yao Nan , Gao Jun , Ao Xiao Chun , Yan Fu Gang
Published: July 2014

In the process of cutting, the problem of flying chips seriously affect the processor’s life safety and the processing environment of workshop. In order to study the characteristics of the chips flying, the authors selected five different kinds of commonly used milling insert, and use these milling insert in the dry milling experiments to study the process of cutting chips flying. In the paper, firstly, carried out flying track analysis on the chips, and concluded the chips flying theory, and then design the cutting experiment, through the statistical analysis of experiments data, to understand the influence of different insert groove chip and cutting parameters to chip flying, and puts forward suggestions on groove development of heavy-duty cutting inserts.
Study on Drilling Characteristics of Supper Alloy GH3039
Authors: Wang Xue Hui , Zhao Can , Guo Yan Yan , Feng Ming Jun
Published: July 2014

This paper explores the drilling characteristics of GH3039 supper alloy. The machining of GH3039 is a difficulty which is commonly used in aircraft and engineer components of the aerospace industry. The spindle speed and feed per tooth are the major influence factors which are studied to gain large removal rate and predict the drilling characteristics. So the single factor test is carried out about spindle speed and feed per tooth. The results of the experiment show that the drilling force of GH3039 decreased with the increasing of spindle speed up to 900r/min which is larger than other metal drilling process. The small feed per tooth may obtain small drilling force. So too low spindle speed and large feed per tooth are not adopted in the GH3039 drilling process. The analysis of the chip formation also verifies the above characteristics. At the same time, the serious serrated chip is occurred which is adverse for the drilling. It has significant for other supper alloy real drilling process.
Study on Force Characteristics for High Speed Sawing of Quartz Glass with Diamond Blade
Authors: Jiang Bo , Shen Jian Yun , Xu Xi Peng
Published: July 2014

High speed sawing is an advanced machining technique for sawing of brittle materials with good component quality and high productivity. In the paper, sawing experiments were carried out to investigate the characteristics of sawing forces by altering many processing parameters in high speed sawing of quartz glass with a diamond blade. The sawing forces and force ratio were analyzed. The conclusions present that in the fixed material removal rate, the increasing of periphery speed can help to lower sawing forces and force ratio; sawing forces increase with material removal rate; in the high speed sawing, the effect of material removal rate on sawing forces is smaller than the one in the low speed.
Chip Formation in High-Speed Milling of Titanium Alloy with PCD Tools
Authors: Li An Hai , Zhao Jun , Zheng Hong Guo , Lu Yong Hong
Published: July 2014

This paper presents a detailed analysis of chip morphology through an experimental study of high-speed milling of Ti-6Al-4V alloy with PCD tools. Milling tests were conducted for cutting speed range from 125 m/min to 2000 m/min with water-soluble cutting fluid. The collected chips were firstly examined with a digital cameras and the free surface of the chips was analyzed by a scanning electron microscope (SEM). Geographical parameters of chip morphologies were described in saw-tooth/lamella frequency on the free surface and chip width. Experimental results show that the variation of chips in high-speed end milling of Ti-6Al-4V alloy is as follows, long and straight-shaped → spiral-shaped → curly-shaped → irregular-shaped. The free surface of chips exhibits saw-tooth lamella structures. The lamella becomes clearer and more obvious at higher cutting speeds. Within the same measurement distance, there is a sharp decrease in the lamella number within same measuring range. This should be attributed to the enhancement of the thermal mechanical coupled field applied to the chip formation processes.
Surface Roughness Prediction and Experimental Analysis in Grinding the Material of Zirconia Used by Dental Restoration
Authors: Lei Xiao Bao , Xie Feng
Published: July 2014

Surface roughness plays an important role in product quality, especially for that used in the domain of dental restoration. This paper presents a study on the surface roughness prediction and experimental analysis in grinding the material of zirconia used for dental restoration. For this purpose, the experiment using the orthogonal method is employed. The orthogonal array and range analysis were applied to study the effect of the process parameter had on the surface roughness. A high accuracy machining center, a new dental bur used only for dentistry, and a surface roughness measuring instrument which have excellent properties, are been employed to conducted the experiment. The experimental results demonstrated that the amount of feed, be the major parameter on surface roughness, followed by the width of cut. At the last part of this paper, a model for predict the surface roughness in grinding zirconia is developed based on the experiment by means of linear regression analysis, which can be used to estimate the values of surface roughness given certain grinding parameters.