bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of High Precision Sunlight Intensity Measurement Device
Authors: Chen Shu Wang
Published: August 2011

Photoelectric detection technology is a kind of new technology of non-contact measure, and it is one of the most important means and methods of modern detection technology. The design of the high precision sunlight intensity measurement device is based on photoelectric detection technology. The sunlight intensity energy is received by the photodiode, and then it is transferred into electrical energy, the current. After the filtration and amplification, the current is converted into digital signal by the ICL7106 A/D converter. Ultimately, the accurate value is displayed on the LED digital tubes. The value shows the sunlight intensity at the moment of the measurement. The experimental result shows that the sunlight intensity is different at the different times.
Electro-Mechanically Integrated Circuit Models for DC Motor Driven Systems
Authors: Lin Chi Hsiang
Published: August 2011

DC motor driven systems include both the electrical and mechanical parts, leading to parameters changes because of interactions. An example is the torsional modes of drive train, which frequencies might be different with and without taking into account the electrical power system. Therefore, in this paper, we propose an electromechanically integrated circuit model to overcome the difficulty. Sinse the whole-circuit model can be used to modify the mode frequencies obtained from tests on a mechanical system alone, it will be a good testing support for a DC motor driven system.
System Modeling and Fuzzy Control of a Thin-Disc Type Piezoelectric Actuator
Authors: Mou Shann Chyi
Published: August 2011

In this paper, the characters of the 4-9-9-14 piezoelectric actuator would be analyzed, and the fuzzy controller is designed to control the rotating velocity of piezoelectric driving platform. There are many kind of analysis which are about the 4-9-9-14 piezoelectric actuator would be done in this paper, including of finding the resonant frequency of the actuator, setting the equivalent circuit, analyzing the quality factor of the actuator, measuring the temperature of the actuator surface, and doing the simulation of the circuit by IsSpice which is used to observe the characters of the 4-9-9-14 piezoelectric actuator. There is higher nonlinear character of piezoelectric material which extends different tensile length when it is given the same input-voltage. Because of this reason, the rotating velocity of the piezoelectric driving platform is always unstable. The fuzzy theory which is used for the controller designed would be used to let the piezoelectric driving platform be stable. The interface, GPIB, is used to adjust the input voltage for the piezoelectric actuator. When the input voltage for the piezoelectric actuator could be controlled, the rotating velocity of the piezoelectric driving platform could be controlled too.
Feature Extraction in the Image Recognition for Plateau Pikas (Ochotona curzoniae)
Authors: Cao Ming Hua , Chen Hai Yan , Wang Hui Qin , Wang Wei Fang
Published: August 2011

The conventional methods for pika observation and investigation are costly both in material resources and manpower, moreover these approaches are difficult to use in long-term and continuous investigation. In this context, a plateau pikas monitoring scheme based on image processing technology was described, and the steps of pika identification is presented. Furthermore, the most challenging issue of pika identification, feature extraction was analyzed in detail. Based on the analysis, the image graying method was utilized to avoid redundance and compress data capacity, and image binarization technology was utilized to eliminate the background noise. Moreover, in order to effectively extract the features, four edge detectors: Sobel, Prewitt, Roberts and Canny were chosen for evaluation, and among these algorithms Roberts detector were found has better performance in the application. At last, median filtering method was utilized in image smoothing for spiky noise elimination and sharp edges preservation. The experiment results showed that the pika detection method based on image processing has the advantages to achieve dynamic and continuous monitor of pika in close quarters, and significantly improved the technique in meadow biogeocenose protection.
Research on Intelligentized Recognition Technology for Double Wavelength Laser Measurement of Thin Film Thickness
Authors: Li Hao Ran , Su Jun Hong , Ge Ai Ming , Yang Li Hong
Published: August 2011

Interference image processing is the key technology of optical interference measurement. This paper introduced the problems on automatic interference fringe processing in absolutely measurement based on laser interference, digital image processing technology. The image acquisition of the SiO2 film and the pre-processing of interferogram was performed.Decimal part of the interference fringes is obtained. Using high-resolution image acquisition system and computer reads and processes the interference image, replaces the traditional work of skilled workers of high intensity for a long time and improves the film thickness measurement accuracy.
Forecasting EGR Rate of Diesel Engine Based on Neural Syncretic Theory
Authors: Yang Shi Bin , Hu Ming Jiang
Published: August 2011

To counter the influencing emission of the diesel engine by the EGR rate, the emission model of the diesel engine was set up by combining Radial Basis Function neural network with Adaptive Neural Fuzzy Inference System. The model first draws on the nonlinear approaching capacity of the RBF network to forecast the diesel engine emission which takes no account of the factor of the EGR rate, and then, based on influencing the diesel engine emission by the EGR rate, the ANFIS system was used to modify the results of the diesel engine emission obtained by using the RBF network so as to acquire the EGR rate curve. The result showed that the emission model of the diesel engine was reasonable; the forecasting strategy had the good resolving power and could be much fitted for the on-line aging forecast of the EGR rate.
Simulation to Compensate Ripple of Air Bearing Stage with Flexure Hinge Mechanisms
Authors: Ahn Da Hoon , Gweon Dae Gab , Hong Dong Pyo
Published: August 2011

This letter suggests a method to improve tracking performance of an H-type XY stage with air bearings and flexure hinge mechanisms. The flexure hinge mechanisms are employed to prevent failure of the air bearings when the yaw motion error of the H-type stage is controlled using a control algorithm called gantry control. Adoption of the flexure hinge mechanism combined with the gantry control leads to occurrence of mutual ripple. Ripple should be handled to obtain good tracking performance. Modeling of the mutual ripple and simulation of two compensation algorithms are presented.
Fluorescent DNA Biosensors on Silica Microspheres
Authors: Ma Xing Meng , Zhang Ji Mei , Dai Zhao , Chen Xiao Yu , Wang Xiao Qing , Zhang Qing Yin
Published: August 2011

A novel DNA biosensor system on silica microspheres as solid carriers which based on the fluorescence resonance energy transfer (FRET) was presented in this work when CdTe quantum dots (QDs) were as energy donors and Au nanoparticles (AuNPs) were as energy accepters. Compared with the fluorescent intensity of CdTe QDs, the fluorescent intensity of DNA biosensors decreased extremely, which indicated that the FRET occurred between CdTe QDs and AuNPs. The biosensor system would have a certain degree recovery of fluorescence when the complementary single stranded DNA was introduced into this system. The DNA detection results indicated that this novel fluorescent DNA probe system could recognize the existence of complementary target DNA or not.
Application of Coordinate Measuring Machine in Reverse Engineering
Authors: Li Da Peng
Published: August 2011

In this paper, application of coordinate measuring machine(CMM) in reverse engineering(RE) of product was introduced. Reverse engineering had become a viable method to create a digital model of an existing physical part and to duplicate it. The reverse engineering process involves measuring an object，reconstructing its point cloud as a digital model and rapidly machining it. Application of obtaining point cloud using CMM was presented in reconstructing the digital model of a shoes tree. Rapid duplicate of a severely worn cam of textile machinery was realized by contact measuring profile points using CMM. Reconstructing the digital model and locally modifying the computer model in computer aided design (CAD) software. Finally, numerical control program was finished in computer aided manufacturing (CAM) software. Automatic measurement close freeform curve function of CMM decreased the workload of picking up data of cam profile. Experimental results showed using CMM can greatly save time and alleviate intension of labour.
Studies on Ceramics Technique
Authors: Liu Hui
Published: August 2011

China has more than seven-thousand-year history of ceramics, in the course of which it forms distinctive style of ceramics culture. Ceramics has been more and more attractive as one artistic school with special style. The paper studies on ceramics technique in order to help people know of and extend the culture of ceramics.
Mercerizing Lye Concentration Online Measurement and Control
Authors: Zhou Xiao Yan , Zhao Shi Hai
Published: August 2011

The work in this paper focuses on developing online measurement and automatic control systems for mercerizing lye concentration and presents the measurement principle and control algorithm in detail. The lye concentration was measured by the system using PLC as controlling core with proportion method. The whole system was connected by overflow pipelines and pumps, which realizes the rapid cycling and online detection of lye, ultimately achieves the reuse of working lye and effectively reduces emissions of lye.
Combustion Kinetics of Pellets Made by Sewage Sludge, Pulverized Fuel Ash and River Sludge
Authors: He Bi Fan , Wang Li'ao , Chen Da Yong , Lu Lei , Chen Zhi Peng
Published: August 2011

By using sewage sludge together with river sludge and pulverized fuel ash to produce lightweight aggregates are useful techniques to reuse the sludge. The raw materials was pretreated and manufactured into pellets with diameter range 5mm-8mm and mixture ratio (dry basis) sewage sludge 30wt%, pulverized fuel ash 15wt% and river sludge 55wt%. In order to be more certain about the characters during the combustion process of the pellets at different heating rates, thermogravimetric analysis was employed to study the thermal dynamics. The differential thermogravimetry profiles showed that the combustion process of pellets include five phases and temperature up to the maximal weightlessness speed peak increase with increasing of heating rates. The comprehensive combustibility of pellet decreased with increasing of heating rates. By using improved Coasts-Redfern integration method to calculate the parameters of pellets combustion characteristics, establish the non-isothermal kinetics models and numerically simulate the procedure of sintered LWA. The research results can give service to the simulation of combustion dynamics of taking sewage sludge and other combustible solid-liquid waste materials as raw materials to produce lightweight aggregates by an innovative designed Arc Blade rotary kiln in Chongqing, China.
An Image Analysis Method for Studing Yarn Cross-Sectional Structure
Authors: Zhen Huang , Yang Kun
Published: August 2011

In this paper, we propose an analysis method for examining yarn cross-sectional structure. After obtaing yarn cross section photos, annular equal area yarn model and binary operation were used for image analysis and treatment. Then, statistic method was applied to analyze the distribution of fiber area in equal areas. The centroid position of the fiber and yarn were calculated, and the percentage values of the fiber area in each equal division against its circle (ring) area were obtained by using an ImageJ software. Finally a yarn sample was examined, and results show that this method is useful.
Research of Anticorrosion in Desulfurization Flue
Authors: Zhu Hong
Published: August 2011

Anti-corrosion coating in desulphurization flue of one wet flue gas desulfurization equipment (FGD) (model 1 and model 2) was designed and studied according to environmental and technical parameters of a coal-fired power plant. And relevant design requirements were confirmed. Application results showed that polyureas has wear and high temperature physical properties, so that it can be used in flue desulfurization equipment for anticorrosion. When the construction of a thickness of 2.0 mm, the high-temperature polyureas protective coating appearance smooth, EDM(electric discharge machining) 100% pass rate, adhesion 10.8 MPa, at 160 °C environment still had outstanding performance, that make sure it could reach its design life of the flue based on estimating the corrosion margin.
Research and Development of Thin Film Gas Sensor and its GPRS Wireless Sensor Based on Internet of Things
Authors: Qin Song , Zhang Bao Cai , Wei Dong , Qu Lu , Qiu Nan Wan
Published: August 2011

Wireless sensor network is a new area of ​​research in the computer science and technology. In response to the demand for a variety of network sensors, this paper describes thin film gas sensors and wireless sensor development, puts forword the manu facturing technology of producing thin film gas sensor with reactive powder doped sputtering method, discusses properties related to gas sensing.and power consumption. And introduces how thin film gas sensor chip and its related GPRS wireless sensor in order to lay the foundation for their application in Internet of Things.
Monitoring Data Analysis of Dalian Subway Tunnel and Inversion of Rock Parameters
Authors: Wan Liang Yong , Wang Jun Xiang , Jiang An Nan , Song Zhan Ping
Published: August 2011

The finite element method combines with differential evolution algorithm to develop the displacement back analysis program. For the field excavation of Dalian subway tunnel, the ground subsidence, crown settlement and convergence displacement are monitoring measurement, then data fitting and regression analysis; Using the independent development program and monitoring data to back analysis so that we can address rock mechanics parameters are not accurate "bottleneck"; According to the inversion parameters, the forward analysis of the finite element numerical simulation, to form a comprehensive monitoring and information feedback system based on the field monitoring - displacement back analysis - being analyzed - field monitoring. The results show that the mechanical parameters of displacement back analysis program are very close to the project survey, while the monitoring and information feedback system has an important theoretical and practical value for safety of surrounding rock and stability of construction process.
Research on Laser Measuring Instrument for Tunnel Surface
Authors: Li De Xin , Hu Zhao Xu
Published: August 2011

A laser instrument is designed to measure tunnel surface, which use a laser distance measure component as measuring sensor. The surface of the tunnel shape and the outline of the object can be measured by the instrument which can rotate around two axes mutually perpendicular. The measure data is processed and the graphic of the surface shape is generated. The hardware structure and composition of the instrument are analyzed, the hardware circuit is designed and components are chosen. Hardware control software and data process procedure are designed. The actual surface can be measured to draw out the 3D graphics. The advantages of this instrument are verified that has stable performance, quick measuring and convenient to use in practices.
Imaging and Testing of Ultrasonic Sh Guided Waves in Plate with Lap Welding Structure
Authors: Zhu Xin Jie , Han Zan Dong , Du Dong , Chen Yi Fang , Yuan Ke Yi
Published: August 2011

The imaging and testing of ultrasonic SH (Shear Horizontal) guided waves may be used into testing and SHM (Structure Health Monitoring) of industrial plate with welding structure in service, which have much more important applied potential. During imaging and testing for steel plate with lap welding structure, photoelastic experiment on propagation of guided waves in Plexiglas plate was studied to clearly see the excellent advantages of SH guided waves. The mode of SH guided waves was analyzed to select the zero order mode SH0 and the SH guided waves transducer with SH0 mode was developed. Based on the synthetic aperture focusing method，a multichannel ultrasonic imaging and testing experimental system of ultrasonic SH guided waves was constructed，the imaging of plate with lap welding structure was mainly studied. The research results shows the ultrasonic SH guided waves and the transducers are fit for long distance testing for the plate with lap welding structure. The ultrasound scattering nearby the weld may cause a blind testing zone, about 150 mm wide, in which the less size corrosion defects at the blind zone could not be revealed in image, so as to lead to defects “no testing”. The imaging and testing of ultrasonic SH guided waves would be used for non-destructive testing of plate with lap welding structure, which image both can characterize the corrosion defects and lap welding structure, and realize the precise location of the weld. The proposed research provides important foundation for improving ultrasonic guided waves imaging and testing quality and SHM of industrial in-site plate with lap welding and larger size.
Research of Measurement Method of Two Dimensional Configuration Drag Test in Wind Tunnel in Case of High Lift
Authors: Jiao Yu Qin , Chen Xi Ping , Zhi Zhen Li
Published: August 2011

Computational fluid dynamics and wind tunnel test are two main technical means to examine the aerodynamic performance of airfoil and two-dimensional(2-D) configuration. Two dimensional wind tunnel tests use commonly wake flow field measurement to integrate for drag of airfoil or two-dimensional configuration, but the integral formulas are based on certain assumptions and of certain bounds of application. In this paper, based on Navier-Stokes equations numerical simulation and two dimensional wind tunnel testing, the drag measuring technique for high lift configuration in low speed wind tunnel is researched. Navier-Stokes equations is solved for the flow around a multi-element airfoil, the wake flow characteristics behind the multi-element airfoil and the assumptions for conventional drag measuring method are analyzed, then a new more precise drag formula for two dimensional wind tunnel test is put forward; Based on the simulation results of multi-element airfoil flow, it’s aerodynamic performance is obtained respectively by integrating the surface pressure and friction drag, and computing with the information of wake flow according to conventional and newly proposed drag calculation formulas, and the three results are compared to verify the accuracy of the new drag formula; The wind tunnel test is carried out to ascertain the accuracy of the new drag formula. It is shown from the results that in the high-lift case the conventional drag formula with the wake information is of many limitations and must be improved, and the new drag formula presented in this paper is more accurate because of consideration of the wake flow characteristics of airfoil or two-dimensional configuration.
Risk Management of Electric Energy Consumption in Industrial
Authors: Khodpan Marut , Vongchavalitkul Sanguan , Patamatumakul Sanguan
Published: August 2011

This study presents a risk management of the electric energy consumption in Nakhonratchasima industrial, case study in Thai Sanguan Cassava Starch Co.,Ltd. by AS/NZS 4360:2004 risk management standard. The objective of this study is to reduce the risk of electric energy consumption. Based on the risk inspection, the impact analysis of electric energy consumption is applied to manage an occasion risk. The analyzed risks are consumption risks and device risks. The consumption risks are load factor, the ratio of electric energy consumption to production unit and power consumption of each unbalance phase. The device risks are an efficiency of machinery and equipment, water pump usages, lighting system and air condition system. The results show that the use of machinery and equipment is the highest risk. Load factor, the ratio of electric energy consumption to production unit and water pump usages are ranged in medium risk level, while each phase of electric energy consumption, lighting system and air condition system are in low risk level. As a priority result, machine maintenance is an initial management to decrease the electric energy consumption. For reducing the electric energy demand, work schedule has been rearranged to enlarge the load factor. Operator controlling will reduce the ratio of electric energy consumption to production unit. The inverter, which is used to control motor in water pump usages, also reduce the risk of electric energy consumption. Finally, the low impact factor from lighting and air condition system are neglected.
A Cost Function-Oriented Quantitative Evaluation Method for Unmanned Ground Vehicles
Authors: Sun Yang , Xiong Guang Ming , Chen Hui Yan , Wu Shao Bin , Gong Jian Wei , Jiang Yan
Published: August 2011

Task driven approach is widely used as an evaluation method for intelligent vehicle, however this approach may lead to many teams using the conservative approach to complete the task. Although the competition task can be completed, it has deviated from the goal of technological development actually. A cost function-oriented quantitative evaluation method is proposed in this study. The time to complete each task and the quality of each indicator are considered in the evaluation method. The cost function-oriented quantitative evaluation method guides the intelligent vehicle’s development in the "low-cost index" (i.e. high technology) direction. The evaluation results in the 2010 Future Challenge: Intelligent Vehicles and Beyond (FC’ 2010) competition showed that the proposed method can quantitatively evaluate the overall technical performance and individual technical performance of unmanned vehicles.
Surface Accuracy Measurement of a Novel Inflatable Antenna by Photogrammetry
Authors: Lin Guo Chang , Bai Xiang Hong , Tan Hui Feng , Wan Zhi Min
Published: August 2011

Surface accuracy measurement of a 1.5m-diameter novel inflatable antenna formed by 18 aluminum-coated Kapton® gores is investigated using digital photogrammetry. More than five hundred 3mm-diameter round retro-targets were glued on the surface of the antenna, and their 3D coordinates at different internal pressures of the antenna were obtained using V-STARS digital photogrammetric system. According to the measured data, the influence of internal pressure of the antenna on its surface accuracy was analyzed, and the deviation of gores’ center line and ribs on the surface were also studied. The results show that the internal pressure has significant influence on the surface accuracy of the antenna, especially near the antenna’s dome.
Empirical Tests of Scale-Free Geometry in NASA DATA
Authors: Wu Fang Jun
Published: August 2011

Complex systems and complexity science to be home and abroad are believed as the 21st century scientific development frontier by numerous scientists. At present, the complex network and software engineering crossover study has just started. The research results of complex systems and complex networks provide a powerful support for exploring the structure characteristics and behavior characteristics of software systems. This paper tests scale free characteristics on NASA data empirically. More specially, this paper checks whether two of Chidamber and Kemerer metrics suite, namely, CBO and WMC follow power law or not.
Transverse Vibration Measurement and Analysis of a Three-Point Supported Dual-Span Rotor System with Angle Misaligned Flexible Coupling
Authors: Feng Guo Quan , Zhou Bai Zhuo , Lin Li Jing , Han Qing Kai
Published: August 2011

The angular misalignment of a three-point supported dual-span rotor system is discussed. Vibration measurement for coupling misalignment is taken in this paper by using the model test rig, and the rotor vibration response characteristics with different misalignment quantities and different rotating speed are compared. Based on the finite element method, researches on the three-point supported dual-span rotor system are made, and then the simulation and experimental results are compared. Both the simulation and the measurement are compared to show the features. The results show that the amplitudes of the misaligned rotor vary with rotating speeds and misalignment angles, and the center orbits of the misaligned rotor change into ellipses with the increase of misalignment, together with double harmonic responses.
Adaptive Edge Detection Method for Image Polluted Using Canny Operator and Otsu Threshold Selection
Authors: Yang Jian Guo , Li Bei Zhi , Chen Hua Jiang
Published: August 2011

In this paper, an adaptive edge detection method (Canny operator and Otsu threshold selection based adaptive edge detection method - COAED) is proposed. The COAED method combines a new hybrid filter with Canny operator to avoid the conflict of Canny operator between noise removing and edge locating, and uses Otsu threshold selection method to determine Dual-threshold of Canny operator adaptively. The new hybrid filter firstly judges whether the pixel is polluted by impulse noise, and then uses a corresponding filter to process the current pixel. A median filter is used if the pixel is thought to be impulse noise; otherwise an improved mean filter is selected to weaken the Gaussian noise. After the image is smoothed by the hybrid filter, a Canny operator with small Gaussian variance is used to extract edge. Because only part of Gaussian noise remains, Canny operator with small Gaussian variance can suppress the noise and preserve the edge effectively. Using the gauge image polluted by hybrid noise as experiment object, the performance of COAED method is evaluated qualitatively and quantitatively. Experimental results show that the COAED method is superior to Canny operator.
An All-Around Measurement and Evaluation of the Chinese Elite Youth Canoeists’ Physical Characteristics Using Factor Analysis Model
Authors: Li Jiang Hua
Published: August 2011

The physical characteristics of athletes are the important indexes for athletes selecting and training monitoring. Through measuring the physical characteristics of the 152 canoeists taking part in the Chinese Fifth Intercity Games and analyzing the data with factor analysis model, the most important factor of canoeists’ physical characteristics, degree of brawniness, was found, and the first ten indexes which can perfectly represent the physical characteristics of canoeists were identified.
The Thermal Conductivity Simulation Calculation of Polyacryonitrile-Based Carbon Fiber/Pitch-Based Carbon/Carbon Composites
Authors: Bai Cui Cai , Liu Xiu Jun , Wan Ju , Liu Hua Liang , Li Tong Qi , Hu Zi Jun
Published: August 2011

The thermal conductivity of polyacryonitrile-based carbon fiber/pitch-based carbon/carbon composites was simulated by the finite element analysis. After the density, thermal capacity and thermal conductivity of graphite and carbon fiber were given for known parameters, the geometric grid figure) was generated after the Gambit software processed the unit geometric model grids and the thermal conductivities of carbon/carbon composites were simulated by the Fluent software.
The Real-Time Detecting Application of CNTs in 3D Braided Composite Material
Authors: Guo Jian Min
Published: August 2011

This paper pay attention to the Carbon Nanotubes Threads (CNTs) in the 3D Braided Composite Material . CNTs as a piezoelectricity sensor, can be braided in the 3D Braided Composite Material. The resistance of the sensor will be changed with the correspondent stress and strain on the 3D Braided Composite Material. The resistance of the Carbon Nanotubes Threads can be detected by computer. So, the stress and strain on the 3D Braided Composite Material can be obtained betimes.
Design and Application of 40m T- Beam Installation with Steel Trestle Bridge Made by Type- 64 Military Railway Girder
Authors: Sun Jin Kun , Huang Shuang Hua , Lin Yue Shui
Published: August 2011

In the case of installation of 40m pre-stressed reinforced concrete T-beam of Bridge A in a high energy-consuming industrial park, difficulties such as poor geology within bridge spans, too heavy T-beam and lack of conditions for installation of steel trestle bridge have been overcome. Finally, the problem of 40m T-beam installation has been resolved through reasonable design and by using type-64 military railway girder to make steel trestle bridge [1].Meanwhile, due to the restriction of terrain, T-beam is pre-cast on the base of lead road with 100m of corner radius, 97 meters away from the bridge. Through proper design of 60-ton track transport beam automobile to match the stress of the steel trestle bridge [2], the issue of transportation of T-beam have been successfully resolved, which has accelerated the construction progress of Bridge A, ensured the timely completion of construction, and greatly reduced the construction cost, which can provide beneficial references for design and installation of similar projects.
Synthesis of High Strength and Well-Defined PEG-Based Hydrogel Networks via Click Chemistry
Authors: Yao Fang , Ji Xiao Xia , Lin Bao Ping , Fu Guo Dong
Published: August 2011

Click Chemistry was used to synthesize a series of PEG-based hydrogel networks. Attributable to the controlled nature and the quantitative yields of Click Chemistry, the prepared PEG-based hydrogels have the well-defined structures, which resulted in the improved mechanical properties and the high swelling ratios of hydrogels
Chemical Modification of Polyester Fibers with Amide-Siloxane Film and its Antimicrobial Property by Electro-Less Silver Plating
Authors: Yang Ying Ya , Yu Dan , Wang Wei
Published: August 2011

Antibacterial polyester (PET) fibers with high electric conductivity were introduced by pretreatment-free electro-less silver plating in this study. The PET fibers were modified with the amide-siloxane film before silver coating, which was proved by the ATR-FTIR spectra, energy dispersive X-Ray (EDX) analysis and thermo-gravimetric (TG) analysis, respectively. Uniform and compact silver-coated film was found on the surface of PET fibers, evidenced by scanning electron microscopy (SEM). With 16% silver loading, the results indicted that silver-coated fibers have high electric conductivity (2.66Ω/cm) and exhibit strong antimicrobial activity against Escherichia coli (with 6.5 mm inhibition ring).
Experimental Investigation on Throat Insert’s Thermal Shock Resistance Using C/C Composite in Solid Rocket Motor
Authors: Wei Xiang Geng , Li Jiang , Chen Jian , Jin Wei
Published: August 2011

To provide the test method for thermal shock resistance of throat insert material in rocket motor design, an experimental method with a SRM of scale down was developed to simulate the thermal load of full-size rocket motor’s throat insert. The test guaranteed the consistency of propellant、chamber pressure 、rate of ignition pressurization and the contour of the surface of throat insert with full-size rocket motor, and make a compromise of condition of throat insert at the same time. This method had well reappearance of the fracture failure of throat insert of a full-size rocket motor, which proved the feasibility of the test method to a certain extent. A comparison test for thermal shock resistance of two different composite materials was carried out. The experimental results indicate that two reserve C/C composite materials had good thermal shock resistance than three directions woven C/C composite material which used in the motor of failure, and the performance of carbon fabric pierced C/C composite material was better than no woven fabric pierced C/C composite material in some sort.
Optimization of Parameters for CO2-Gas Shielding Arc Welding Based on the Double Weights Neural Network
Authors: Lv Lin Lin , Gu Ju Ping , Hua Liang , Fan Wei , Qiang Yu Jian
Published: August 2011

It is very difficult to predict the process detection and performance parameters, because of the highly nonlinear and multivariable coupling of welding process. In this paper, we construct a new method in optimization of parameters for CO2-gas shielding arc welding. By using the new Double Weights Model, this algorithm can give the Direction Weight, also the Core Weight at the same time. The new network inherits the traditional BP network and RBF (Radial Basis Functions) network with multivariable parameter settings and so on. We apply the network to the optimization of welding parameters, experimental results show that this algorithm can use less generations to calculate and get more accurate optimization effects, also not serious about a local minimum compared with RBF while using the same environment and equal network scale. Experiment proves that it is feasible to control welding parameters by the Double Weights Neural Network.
Plasticity Model and Numerical Simulation of Extruded Oilseeds in Closed Cell
Authors: Zheng Xiao , Zhang Ya Xin , Lin Guo Xiang , Sun Zhi Xian
Published: August 2011

By using of Kuhn`s yield criterion, plasticity constitutive equations of extruded oilseeds in a closed cylinderical cell were developed. The model parameters were identified from experimental stress—strain using an inverse method. The maximum relative deviations between the measured and the simulated value of soybean and cottonseed are 8.5% and 5.1% respectively, and the average relative deviations are 4.9% and 3.8% respectively. The results of numerical simulation for confined pressing of granular soybeans and cottonseeds in the closed cylinderical cell indicated the following facts that granular soybeans and cottonseeds conform to the model of three power curve, the plasticity constitutive equations can describe the plastic deformation for extruded soybean and cottonseed, and Kuhn`s yield criterion can be used as theoretical basis for plasticity model of granular soybeans and cottonseeds.
Make Use of FPGA to Carry Out Ultrasonic Wave High Definition Nondestructive Thickness Measurement
Authors: Yang Wei Jian
Published: August 2011

This paper discussed the principle of the Nondestructive Thickness Measurement creation of the ultrasonic wave high definition and analyzed the reason that the ultrasonic wave measures a thick accuracy decision factor and error creation. Discussed to make use of FPGA to carry out the error of ultrasonic wave high definition in the common MCU is smaller than a 0.1 mm Nondestructive Thickness Measurement technique principle and carry out a method, kept to get application and realization in the gas well examination in 863 item CNGs.
The Application on Risk Evaluation of Gas Explosion in Heading Face Based on Unascertained Measurement Model
Authors: Liu Lian Sheng , Zhang Guang Quan , Wu Hui
Published: August 2011

According to influence factors of heading face gas explosion in coal mine, selection principle based on evaluation indexes, combined with Coal mine safety regulations, Technical standards for gas extraction and experts advice, the multilevel evaluation sets of gas explosion risk in heading face was established, and the weight of each evaluation factors was determined by information entrop, finally, a coal mine was evaluated by using the unascertained measure evaluation model we had established, then security level of the coal mine was achieved. The results showed the unascertained mathematical theory was applied on comprehensive evaluation of the gas prevention and control in mine heading face, it had important significance to prevent the occurrence of gas explosions and other accidents in heading face.
A Method for Initial Stress Analysis of Micro Vessel Wall
Authors: Gao Fa Rong , Gao Yun Yuan , Xi Xu Gang
Published: August 2011

A blood vessel model of pseudo-elastic constitutive relation in an absolute (vacuum) zero-stress state is employed, and analytical equations of the vessel wall in the three-dimensional stress state are obtained in this paper. The stress distributions in circumferential and axial directions with different blood pressure levels and material parameters are discussed. The results show that the initial stresses of the vessel wall will increase with increment of the blood pressure, the material parameters also affect the distributions of initial stress, in particular, the increase of axial material parameters, will significantly increase axial stress. These methods are importance in the investigation of the vascular dynamic problem, and conclusions are of use in prevention of the related vascular diseases.
Research on Springback Compensation in Age Forming Technology of Integral Panel
Authors: Gan Zhong , Zhu Jia Zan , Zhang Lei
Published: August 2011

Age forming technology has some features including high rebound, especially it is difficult to control the precision of rebound. Due to the above-mentioned problems, this technology is difficult to be accepted and used widely. This passage mainly discusses the problem of age forming technology of integral panel with high ribs. Through the basic experiment of T-style 2124aluminium panels, the springback rule was studied, and the springback compensation of the complex mold surface was accomplished by adopting a geometrical compensation algorithm, this mold was used by parts making. The result of experiment is that the error of curved surface of part is less than 1 mm and the steel bar is less than 0.5 mm. It shows that the method is feasible and effective.
Finite Element Modeling of Polymer Flow during Hot Embossing with Different Mold Structures and Embossing Conditions
Authors: Zhang Ting , He Yong , Fu Jian Zhong
Published: August 2011

The geometric structures of the mold and embossing conditions can obviously influence the filling flows in the polymeric patterns. In this study, embossing stamp and substrate with different geometries are used to investigate the flow behavior under both isothermal and non-isothermal conditions. In general, for the stamp, small duty ratio cavity fills more sufficiently than large duty ratio cavity. With the same cavity duty ratio, inner cavity fills more quickly and sufficient than outer cavity. Compared to multiple cavities stamp, individual cavity fills more slowly, especially embossed with the stamp having small duty ratio cavity. Under non-isothermal embossing, the filling flow indicates a wall climbing flow and the polymer flow replaces the outer cavity better. Uncommon substrate provides a limitation of out-squeezing flow from polymer layers, so the polymer pick reaches the mold faster than common substrate like the flat. The present simulation study provides an analysis of the mold geometry especially the substrate geometry to govern filling flow and replication fidelity.
Design of Interface Circuit of CPLD-Based Photoelectric Encoder
Authors: Liao Hong Bo , Zhou Xiao Yao , Zhang Lian Chao , Fan Da Peng
Published: August 2011

A CPLD-based Photoelectric encoder that measures angle and angular velocity was designed aiming at precise requirements on angle and angular velocity measures in photo-electric servo system. Based on the work principle of photoelectric encoder, a segmented velocity-measure algorithm based on different measure time intervals was presented, and the concrete process in the environment of Isplever Project Navigator was detailed described. Finally, DSP processor TMS320F2812 and CPLD chip LC4512V-75T176 were used for verification. The result showed that this circuit has the features of realization-simple, high measure precision and reliability as well as good commonality. It will lay a solid foundation for the realization of photoelectric servo system’s digital control.
Research on High Efficient Virtual Measuring Method for Globoidal Cam Machining Error
Authors: Hu Zi Hua , Liu Jie Mei , Kuang Zheng , Tang Liang
Published: August 2011

Current methods for measuring Globoidal cam exist these problems: difficulty of measurement of profile machining error, heavy dependency on expensive measuring equipment and low measuring efficiency. In order to solve them, this paper established a high efficient virtual measuring method for globoidal cam machining errors. Based on virtual measuring theory and globoidal cam space engagement theory, and by taking the three-dimensional machining simulation models of the globoidal cam profile as the measured object, the virtual gauge head can do measurement along the planned measuring path. The machining error calculation method was determined according to the degree of geometric interference between virtual gauge head and the surface of machined models. And a virtual measuring system on UG platform for globoidal cam profile machining errors was built by use of Visual C++ 6.0 and UG/Open API secondary development tools. Finally, a virtual measuring experiment was performed for the two kind of machining simulation models generated by generating method and one-side machining method. The experimental results show that the high efficient virtual measuring method for globoidal cam machining error is correct and the virtual measuring system is reliable. On the one hand, an effective method is provided to achieve an efficient, low-cost measurement for globoidal cam profile machining errors in this paper. On the other hand, it has great engineering guiding significance for the actual production and processing of globoidal cam.
Design and FEM Analysis for Crankshaft in Truck Mounted Petroleum Compressor
Authors: Zhou Si Zhu , Hu Xin Bin , Li Chao , Wang Xiao Wei
Published: August 2011

Crankshaft in truck mounted petroleum compressor is constrained by space concerns, design is difficult. In this paper, primary structure design parameters are extracted from the crankshaft design process, and crankshaft stress distribution is calculated under ANSYS, providing a reference for compressor optimization. It is useful to guide the design.
Gross Error Detection in Pneumatic Measurement of Form Tolerance Based on Fuzzy Assessment
Authors: Liu Jun , Wang Guang Lin , Wang Jie , Pan Xu Dong
Published: August 2011

Aiming at the problem of gross error in datasets of form tolerance pneumatic measurement, which have the characteristics of small sample and non-statistical distribution, a new fuzzy assessment based method for detecting and rejecting the gross error is proposed. The detecting principle and its procedure are elaborated, and some correlative problems, including the valuation of fuzzy optimal factor and calculation of fuzzy available interval are also discussed in detail. Using an actual dataset in pneumatic measurement of form tolerance to calculate, the results demonstrate the effectiveness and consistency of the proposed method and it can be used to detect and reject the gross error of the measurement sequence in a rapid, simple and reliable way by comparison with the traditional methods based on statistical theory. And it is well suited for detecting gross error in various measurement processes with the measured datasets of small sample and non-statistical distribution.
Minimizing Total Earliness and Total Tardiness on Single Machine with Release Dates
Authors: Oyetunji Elkanah , Oluleye Ayodeji E.
Published: August 2011

This paper considers the bicriteria scheduling problem of minimizing the total earliness and the total tardiness on a single machine with release dates. In view of the fact that the problem has been characterized as NP-Hard, we propose two approximation algorithms (labeled as ETA1 and ETA2) for solving the problem. The proposed algorithms were compared with the MA heuristic selected from the literature. The two criteria (the total earliness and the total tardiness) were aggregated together into a linear composite objective function (LCOF). The performances of the algorithms were evaluated based on both effectiveness and efficiency. The algorithms were tested on a set of 1200 randomly generated single machine scheduling problems. Experimental results show that both the ETA1 and ETA2 algorithms outperformed (in terms of effectiveness and efficiency) the MA heuristic under all the considered problem sizes. Also, the ETA1 algorithm outperformed the ETA2 algorithm when the number of jobs (n) ranges between 20 and 500.
Numerical Analysis of Cold Tube Drawing Operation using Finite Element Method
Authors: Oladeinde M.H. , Akpobi John A.
Published: August 2011

In this paper the effect of semi die angle on drawing load in cold tube drawing has been investigated numerically using the finite element method. The equation governing the stress distribution was derived and solved using Galerkin finite element method. An isoparametric formulation for the governing equation was utilized along with C0 cubic isoparametric element. Numerical experimentation showed that the results obtained using the present method is very close to the analytical solution and more accurate than finite difference solution. Having established the accuracy of the present solution method, parametric studies were carried out to show the effect of semi die angle on the drawing load for different tube drawing processes. The analysis was carried out using a Visual Basic.Net program developed by the authors. The results are presented in both graphical and tabular forms.
Comparison of the Three–Zone Evaporation Model with Boiling Heat Transfer in a Compact Tube Bundle
Authors: Adom Ebenezer , Kew Peter , Cornwell Keith
Published: August 2011

The recent interest in boiling heat transfer in small diameter tubes has led to the study of boiling heat transfer outside a compact tube bundle of diameter 3mm. The bank comprised 3 columns each of 10 stainless steel electrically heated tubes of 3mm outside diameter, with pitch to diameter ratio of 1.5 in an in-line arrangement. These tests were carried out using distilled water and R113 at nominal atmospheric pressure over a range of heat fluxes between 4-21 kW/m2 for mass fluxes from G=5.6 - 32.8 kg/m2s. The recent three-zone evaporation model developed by Thome, Dupont and Jacobi for boiling inside micro channels was used to compare with experimental results as photographic study showed that bubbles confined within the bundle were responsible for the heat transfer enhancement observed. It was observed that the three state model was promising in its application to the bundle arrangement as the confinement number Co for bundle has been shown to be in the order of 0.63
Solving Large-Scale Multipoint Lighting Design Problem Using Multi-Agent Environment
Authors: Sędziwy Adam , Kotulski Leszek
Published: August 2011

In the paper we focus on the problem of large-scale distribution of lighting points. Its solution is constrained by economic issues like power consumption or exploitation costs and, on the other side, by the computational complexity of design process. Multi-agent computational environment combined with graph and hypergraph representations of a problem allow meeting design requirements and objectives and, on the other hand, make the method applicable for large systems for which computational effectiveness is a crucial factor.
Kinematic Calibration of PHANTOM Premium 1.5/6DOF Haptic Device
Authors: Baser Ozgur , Konukseven Erhan Ilhan
Published: August 2011

Precise positioning and precise force control requirement in haptic devices necessitate the calibration of the device. Since force control algorithms in haptic interfaces employ Jacobian matrix that includes kinematic model parameters, calibration is not only important for pose accuracy but also for force control. The deviation in kinematic parameters and joint transmission errors are main reasons disturbing the calibration of the haptic devices. Capstan drives and parallelogram mechanisms are preferred to use for actuation in haptic device design. Their transmission errors should be estimated in the calibration. This paper presents a simulation study including the estimation of kinematic parameters and transmission errors due to the capstan drives and parallelogram mechanism for a PHANTOM Premium haptic device.