bluuebunny/crossref_metadata_2025 huggingface dataset:
Research and Development of an Automatic Test System for Power Supplies
Authors: Huang Chin Jung , Tsai Fa Ta , Tsai Ku Pen
Published: November 2012

With rising attention to the quality of AC/DC, DC/DC power supply, in response to the verification of design and production of power supply, and to ensure the quality demand of power supply, power supply automatic testing system is thus developed. Power supply testing systems with features of higher accuracy, lower cost and shorter testing time should be designed to guarantee the quality of power supply to win high level of customer trust. This testing system uses Labview software to establish an open platform with built-in testing program editors of considerable freedom and convenience to allow engineers to rapidly edit testing programs for various projects and design various customized testing items. This study develops the unified instrument control interface for various testing demands of instruments and equipments made by different manufacturers. With software operating panel record functions, the system can record each testing step and furthermore edit. This study proposes the Test System Performance Index to facilitate customers to evaluate and compare the performance capabilities of various power supply testing systems. Higher Test System Performance Index indicates better performance of the testing systems. By comparison, the test system performance index of the testing system and Chroma 8000 are 3.36 and 0.164, respectively. This indicates that the testing system has definite advantages including more testing functional items, shorter testing time, low manufacturing cost, and supportability of various types of equipments, thus making it a system with great potentials.
A Support-Vector-Machine Method for Precisely Evaluating Planar Straightness Error
Authors: Meng Jiang
Published: November 2012

To present a precise and efficient algorithm to solve planar straightness error problems, a machine-learning approach to evaluate planar straightness error was presented in this paper. According to the similarity between the least envelope zone and the support vector regression model, the SVR-based method was developed to solve the problem of straightness error. The evaluation method was compared to some existing techniques. According to the results from three datasets, it is shown that the SVR-based method can provide precise and exact values of planar straightness error.
Experimental Research on the Expansibility Factor Calculation Model of V-Cone Flowmeters
Authors: Zhang Tao , Bai Long , Zhao Yi
Published: November 2012

This article aims to improve the accuracy of gas flow measurement of cone flowmeter and get a high-precision expansibility factor calculation model with wide applicable pressure range and different upstream side pressure. The experimental research was based on the DN50 and DN100 two sets of V-Cone flowmeter designed by Tianjin University. As the standard gas flow facility by means of critical flow venturi nozzles was insufficient supply capacity and poor pressure stability in positive pressure method, the experimental data obtained from standard gas flow facility by using negative pressure method was used to fit out the V-Cone flowmeter expansibility factor calculation model --TJU-2012 model. The model was tested with the experimental data obtained from the standard gas flow facility and compared with other four cone flowmeter expansibility factor calculation models, its maximum relative error was better than 0.9% and square averaged root error was better than 0.6%, both of them are the least.
A Micro Pressure Sensor Based on SU-8 Polymer
Authors: Zheng Xiao Hu , Han Chang Yong
Published: November 2012

This paper investigated an novel wireless RF pressure sensor fabricated with SU-8 polymer. The sensor consists of an inductor (L) interconnected with pressure-variable capacitor (C) to form a LC resonant circuit. The fabricated devices is 4 × 3 mm2 in size and houses 9 turns of Cu electro-plated coil with inductance of 100 nH. In this system, RF signal was transmitted from external antenna to the fabricated LC resonator. Then RF signal was changed as power of fabricated device via inductive coupling. The external antenna was modulated by resonant frequency of the LC resonator. By detecting this abrupt resonant frequency shift of the device, the pressure change of the device can be measured by wireless method.
Mental Workload Analysis during the Production Process: EEG and GSR Activity
Authors: Ma Qing Guo , Shang Qian , Fu Hui Jian , Chen Fu Zhou
Published: November 2012

In this study, field research was used to study the mental workload during the production process. The physiological signals of electroencephalogram (EEG) and Galvanic Skin Response (GSR) were recorded by using NeXus-10 equipment. The novices yielded significantly larger mental workload than veterans in the right hemisphere for theta, SMR, beta and gamma band. To investigate whether the given process activated both the left and right brain in a balanced manner, we calculated asymmetry index. Novice group yielded higher asymmetry index than veteran group for theta and SMR band. GSR was small higher which induced more negative emotions for the novice group than the veteran group. These would be used as new factors added into production system management
A Quantification Study on Advanced Manufacturing Technology’s Social Influence Assessment
Authors: Song Zhi Jie , Wang Guo Hong
Published: November 2012

AMT investment projects not only improve the business productivity but effects the social aspects such as employment, macro economic and the stable development, and so on. Governments should make reasonable decision considering more from sociological perspective, because of that society benefits is more important than the profits to the business. This paper will construct the social assessment frame to the AMT project and use fuzzy evaluation to quantification the assessment result. Taking an enterprise from China as the empirical example tests this method, and verifies the project’s feasibility.
Bonding-Antibonding Ground States Transition in Coupled Quantum Dots
Authors: Tang Nai Yun
Published: November 2012

The two lowest single-particle hole states in two vertically coupled quntum dots (CQDs) are investigated by using the six-band k • p model. A bonding–antibonding ground-state transition is observed with an increasing interdot distance. This result is counterintuitive since the antibonding molecular ground state is never observed in natural diatomic molecules. By comparing the wavafunction component of hole, the results verify that the reordering of bonding and antibonding orbitals with an increasing interdot distance is caused by spin–orbit interaction of holes.
Study on RoHS Data Integration System Based on Optical Character Recognition
Authors: Zhou Chuan Hong , Shi Hai , Wang Xiao Ning
Published: November 2012

Nowadays, more and more companies are going to adapt themselves to restriction on the use of certain hazardous substances (RoHS) compliance. There are many RoHS testing equipments, so there are many RoHS Data formats. It is great inconvenient for the enterprise information management. This research puts forward to OCR technology as the foundation, using OPC technology and FTP technology is suitable for the construction of the RoHS testing data integration system framework which solves the RoHS testing field to the problem of data integration.
A New Identiﬁcation Method for Dual-Rate Wiener Systems
Authors: Zhang Yan , Chen Jing
Published: November 2012

A new parameter estimation method is introduced for dual-rate Wiener systems. The method uses the ﬁnite input response model and a stochastic gradient algorithm to estimate the parameters of the ﬁnite input response model. The origin parameters can be computed by the estimated parameters. Simulation studies of dual-rate Wiener systems identiﬁcation are included.
Information Modeling and Implementation of Mold Enterprises Based on Teamcenter System Management Platform
Authors: Zhang Yu , Cai Hua , Tian Guo Fu
Published: November 2012

The information modeling of mold enterprises which based on Teamcenter product lifecycle management software platform is put forward, according to the analysis to the characteristics of injection mold manufacturing enterprises. User management model, product structure model and workflow management model have been established and implemented in the system management platform. It is not only enhance management level to data of mold enterprises, but also the scientific and effective methods of modeling and implementing can be provided for the other mold enterprises to carry out system platform of product lifecycle management.
A Novel Baseline Correction Algorithm
Authors: Jia Er Hui , Li Bin , Zhang Tao
Published: November 2012

This paper studies baseline correction algorithms for subtracting the background of real-word signal. A novel baseline correction algorithm is proposed that can be solved by random signal processing. With respect to generalized statistical features of the raw data, an appropriate threshold of standard deviation is set to extract the true baseline points unfailingly. Under the generalized meaning, the background at one signal point is substituted by the statistical features of its local window. By using this proposed algorithm, we established a time varying signal baseline independently and accurately. And performance evaluation shows that the proposed algorithm is more elaborate and tolerant of real-word data than the previous ones.
Application of Improved Wavelet Threshold Method in SEMG De-Noising Processing
Authors: Yao Lu , Sun Sheng Qi , Li Lin
Published: November 2012

The surface electromyography signal is often submerged by the noise background while being gathered and recorded. To some extent, the useful signal and noise signal can be separated by applying the wavelet de-noising method effectively to eliminate the noisy signal. However, there are discontinuous points and constant deviations in the traditional wavelet threshold methods. Taking these problems into consideration, the improved threshold method is proposed and based on soft threshold function to use a transition of the nonlinear function to deal with the threshold function and de-noise the SEMG. Experimental results show that the improved threshold method has better de-noising effect and higher signal-noise ratio than the traditional threshold method.
Non-Deterministic Polynomial Application in Financing-Stability Based Manufacturing Production Planning
Authors: Su Jin Long
Published: November 2012

Concerning the managing policy of the ASC in Integrated Infrastructure for Agile Enterprise(IIAE), the author mainly researches on the algorithm of agile manufacturing plan and the management of the supply chain, and promotes the production planning algorithm based on the multiple product requirement, one of the Non-deterministic Polynomial problems about the stability of fund and its resolvent algorithm. The author thereupon promotes an effective Game playing algorithm for the cooperation in enterprises, profit distribution and maximization, and effectively improves the economic performances of individuals and the determining efficiency in the ASC. This paper is one of the series of papers about the design of Agile Infrastructure for Collaborative Manufacturing as well as Agile Supply Chain. This one lays emphasis upon the design of the optimal production planning algorithm to keep the manufacture financing stability in product cycle. We mainly concern and research into the optimal production planning including the problem solved in manufacture financing by optimal product schedule, the analysis of chaotic neural network optimization algorithm, the solution to the problem & algorithm design in optimal strategy for production. Their logical relationship and flow chart designs are elaborated in turn. The paper tries to introduce the research of Agile Infrastructure and its key technologies, showing how well they work in some traditional manual industries.
Fuzzy Co-Evolutionary Genetic Algorithm and its Application in Clinical Nutrition Decision
Authors: Wang Gao Ping , Zhang Meng
Published: November 2012

The fuzzy co-evolution genetic algorithm is applied to clinical nutrition decision-making optimization. By cooperative co-evolutionary algorithm, the decision problem of clinical nutrition is divided into two populations ,which is combined into a complete diet recipe. In this paper, different fuzzy-based definitions of optimality and dominated solution are introduced. The corresponding extension of Co-Evolutionary Genetic Algorithm, so-called Fuzzy Co-Evolution Genetic Algorithm (FCEGA), will be presented as well. To verify the usefulness of such an approach, the approach is tested on analytical test cases in order to show its validity . The solutions, provided by the proposed algorithm for the clinical nutrition diet model,are promising when compared with an existing well-known algorithm.
An Improved OFDM Timing Synchronization Algorithm
Authors: Dai Jing , Guo Fei Fei , Zhang Guo Lin
Published: November 2012

Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier communication system and the system is very sensitive to synchronization errors. The problem that synchronization is not accurate can reduce the system performance largely. Based on the research of Schmidl & Cox and Minn algorithms, the paper proposed an improved timing synchronization algorithm by using the new training sequence in the frequency domain. The improved algorithm eliminates the peak platform problem and side lobe peak problem of the conventional synchronization algorithms in this article. The simulation at MATLAB shows that the improved algorithm overcomes the problems of the conventional algorithms and the timing judgment curve of the improved algorithm also has a very sharp peak at the timing synchronization position, compared with the conventional algorithm. So, the timing synchronization performance of the algorithm is better.
An Accelerated Iterative Method with Third-Order Convergence
Authors: Hu Zhong Yong , Fang Liang , Li Lian Zhong
Published: November 2012

We present a new modified Newton's method with third-order convergence and compare it with the Jarratt method, which is of fourth-order. Based on this new method, we obtain a family of Newton-type methods, which converge cubically. Numerical examples show that the presented method can compete with Newton's method and other known third-order modifications of Newton's method.
Forecasting Model Based on Improved Grey-Markov
Authors: Cao Qun , Liu Bing Xiang , Cheng Xiang
Published: November 2012

It is great significance to forecast the water quality of Poyang Lake in the construction of Poyang Lake Ecological Economic Zone.On the condition of limited historical data,for resolving the prediction,by combining the advantages of both grey prediction and Markov theory,an improved grey-Markov model is established.First the sequence is moved average,and then unbiased grey-Markov prediction is established to imitate the development tendency of the forecast system.Divide system state into five parts by Markov chain in order to inprove the prediction accuracy. By analying an example,comparing the predicted values and real measured values,The results show that the model has a certain accuracy and reliability
The Modeling and Simulation of Load-Acid Buttery on Principal Component Regression
Authors: Gong Lei , Dong Yu Cai , Zhang Ling , Lin Min , Cao Su Na
Published: November 2012

The lead-acid battery is the auxiliary power to widely use for starting tanks and armored cars, but its internal electrochemical reaction is a complex process for sensitive environment. According to make the battery modeling with the principle component regression, and to analyze the relative error simulation result compared with the lead-acid battery and three-order models which is popular application currently, which provide the new concept for solving the battery modeling and simulation.
The Design and Implementation of the Trojan Horse Based on Kernel Hacking
Authors: Feng Wan Li , Zhou Hong , Yu Chang Hui
Published: November 2012

It is an important ways that the Trojan Horse invades the Linux system through the kernel hacking. Its principle is using the mechanism provided by Linux kernel to realize Trojan Horse functions，which is mainly realized through the kernel programming. This paper has studied the two methods of kernel hacking with emphasis：Directly revises the kernel source codes and uses the Linux module mechanism. Finally, on this basis, a kind of kernel hacking Trojan Horse has been designed and realized.
A Resource Discovery Mechanism on Cloud Computing System
Authors: Zhao Hong Wei
Published: November 2012

Cloud Computing is an efficient way to resolve the resource sharing and cooperative work in distributed environments. Considering the disadvantages of traditional Scheduling method and the characteristics of Cloud Computing System, a resource discovery mechanism has been designed and implemented. Firstly, a calculation method based on each join points’ loading has been proposed, providing the Formula of method. Secondly, a comprehensive service resource distribution method has been designed and implemented in consideration of respective service resource counts, each join points’ performance and current loading distribution. Finally, the result of the experiment indicates that the scheduling system can improve the efficiency of dispatching service resource and the utilization ratio of distributed service resource on Cloud Computing System.
Study on Campus Network Security and Protection Technology
Authors: Fu Wei Hong , Liu Jian Hua
Published: November 2012

While the popularization of campus network plays an inestimable role in accelerating the information processing, making full use of excellent education resources, improving work efficiency and implementing the resources sharing, the security of campus network has become more and more prominent. This paper based on the analysis on the current situation of campus network, proposes some strategies to put the security under control. The strategies proposed have been put into application, which has improved the network management efficiency and strengthened the availability and controllability of campus network.
Dynamic Visualization of Urban Changes Based on Flex
Authors: Wei Wei , Zhang Jia Hua
Published: November 2012

The advent of programmable vector graphics on the web has major implication for web GIS. Macromedia Flash as a plug in possesses many characteristics. However, Flash is more suitable for designer not for a programmer. Especially in the temporal GIS. Furthermore, Flash takes much time to generate SWF files. Therefore, Flex is an alternative. It has better messaging infrastructure and data synchronization. The paper provides a method to display the urban change using Flex 4.6. Another attraction of the project is the use of the Web Service which link Flex to the database. The result shows that it is easy to dynamically display the urban change using Flex and Flex is easier for web applications than Flash. Other benefit of the work is the service can be used in other application or by other people.
Research of Fault Diagnosis System for NC Machine Tool
Authors: Yang Lin , Wu Wei , Wu Rui Nan
Published: November 2012

As the theoretical research and practical application of the key technology and bottlenecks, Fault diagnosis technology get the focus of manufacturing field at home and abroad and have achieved some innovative research achievements[1]. This paper analyzed the failure causes of numerical control machine, linked the fault tree and fault diagnosis expert system knowledge base, develops numerical control machine fault diagnosis expert system which has a friendly man-machine interface, reasonable reasoning method and explanation function by using C programming language and object-oriented program design method.
Application of New Collector RTB in Ilmenite Flotation
Authors: Zhang Xiao Lin , Liu Dian Wen , Fang Jian Jun , Wei Zhi Cong
Published: November 2012

The flotation experiment of ilmenite from magnetic tailings in Panzhihua with the new collector(RTB) is investigated．The satisfactory result is obtained in once roughing-once cleaning-once scavenging circuit batch testing of flotation by using RTB as a collector，CMC as a depressant，and sulfuric acid as pH regulator. The TiO2 grade of titanium concentrate is 46.87 percent，and the recovery is 50.77 percent with the TiO2 grade 11.81 percent. Compared with collect(MOS) which are used in production，RTB has obviously not only advantages of selecting and collecting capability, but also advantages of costs.
A Winch Fault Classification Algorithm Based on Cluster Kernel Semi-Supervised Support Vector Machine
Authors: Shi Xian Xin , Zhao Zhong Xiang , Zhu Chang Jian , Kong Xiao Xiao , Chai Jun Fei , Li Li Jing , Zhao Huan
Published: November 2012

A cluster kernel semi-supervised support vector machine (CKS3VM) based on spectral cluster algorithm is proposed and applied in winch fault classification in this paper. The spectral clustering method is used to re-represent original data samples in an eigenvector space so as to make the data samples in the same cluster gather together much better. Then, a cluster kernel function is constructed upon the eigenvector space. Finally, a cluster kernel S3VM is designed which can satisfy the cluster assumption of semi-supervised study. The experiments on winch fault classification show that the novel approach has high classification accuracy.
Application Research of Stick-Slip Mechanism on MW Wind Turbine Yaw System
Authors: Li Xiao Guang , Zhao Ping , Zhong Jie
Published: November 2012

The “stick-slip” motion or creep phenomenon is often observed in MW wind turbine yaw system. Yam system stick-slip coupling phenomenon was analyzed, and stick-slip coupling kinematic model was established and simulated by Simulink. The influence of torsional stiffness, friction coefficient difference, rotating speed, damping ratio and tightening torque on system was researched. Main measures for elimination of stick-slip coupling phenomenon were given through theoretical analysis and simulation calculation.
The Evolutionary Potential Prediction Research of the Loader Based on TRIZ
Authors: Shi Xiao Chun , Zhang Na
Published: November 2012

In order to predict the evolutionary potential and the technological development direction of the loader, the combination of the maturity prediction and the technology evolutionary mode and the evolutionary line in TRIZ (Theory of the Solution of Inventive Problems, Invention Problem Solving Theory) determines the technological maturity of the loader, and analyzes the location of the loader’s evolutionary route along the different evolutionary mode, finally put forward the possible future development direction of the loader according to the current evolutionary potential .
Turbine Generator Fault Diagnosis Based on Time Domain Average Laplace Wavelet
Authors: Ren Xue Ping , Wang Jin Lei
Published: November 2012

In view of turbine generator vibration abnormal,introduces fault diagnosis method based on time domain average Laplace wavelet analysis, and successfully applied to the site. Briefly introduced the time domain average and Laplace wavelet filter theory and algorithms, first use time domain average extract the cycle signal component from complex signal.then use Laplace wavelet correlation filtering to get correlation coefficient, then get characteristic frequency from the correlation coefficient of Fourier transform in order to achieve fault diagnosis. Finally it verified the effectiveness of this method through an instance of the fault diagnosis of turbine generator bearings not verify.
Robust Design of 4-Position Motion Generation and Application on Front End Loader
Authors: Qian Wei Xiang
Published: November 2012

A robust design approach of 4-position motion generation is presented, and it is applied in the design of front end loader. The mathematical model of optimum design based upon the engineering requirements has been established, by which feasible robust solution regions adhering to conventional constraints and kinematic accuracy requirements can be visually represented. It guides designers to synthesize robust mechanisms that ensure every design condition. The example of front end loader demonstrates that the process of searching the optimal robust mechanism is more intuitive, highly accessible and easy to be applied in engineering practice.
Improved Artificial Fish Swarm Algorithm Applied on the Static Model of the Induction Motor Parameter Identification
Authors: Lv Jing Yong
Published: November 2012

According to the induction motor operating characteristics, application of improved artificial fish swarm algorithm based on the simplex method to solve the equivalent circuit model parameters identification problem. Gives a detailed calculation steps and the curve of function expressions. Finally, the identification results and identification using genetic algorithm result is compared to prove that the accuracy of the identification results of the improved artificial fish swarm algorithm having higher precision.
Research of Wet Gas Experimental Facility with Adjustable and Intermediate Pressure
Authors: Xu Ying , Yin Cun , Long Zheng Hai
Published: November 2012

In order to better simulate the flowing condition of wet gas, Tianjin University has designed and built up a wet gas flow experimental facility with adjustable and intermediate pressure in the flow laboratory. The designed pressure of the facility which used standard meter method and dual closed-loop design is 4MPa. The experiment medium is air and water, and the highest operation pressure is 1.6MPa. The gas flow rate range is 3~1000m3/h, and the liquid flow rate range is 0.05~8 m3/h. This article includes the structure introduction of the facility and the calculation of pressure loss of the system, etc. By the uncertainty assessment for the discussed facility, the conclusion is stated that the facility’s gas measurement uncertainty is 1% and the facility’s liquid measurement uncertainty is 0.35%.
Intelligent Car Movement Monitoring System Based on LabView
Authors: Li Yi Nan , Liu Yu Long , Liu Si Wei
Published: November 2012

To resolve the problems that it’s difficult to observe the data of real-time motion state and controls parameters, and difficult to determine the running strategy, we come up with a system design based on virtual instruments and wireless data collection. This system can not only collect the intelligent car’s running speed, steering engine angle and wheelpath, but also draw the racing track, select and optimize the running strategy. This system has been proved that it can monitor the intelligent car accurately which shortens the debugging period greatly.
Application of Variable Structure Control Base on Kalman Filter Rearch Law to Electro-Mechanical Actuator
Authors: Li Yan , Chen Yang
Published: November 2012

A control scheme of direct DC electro-mechanical actuator based on discrete-time variable structure controller with Kalman filter is designed. In order to improve the perfect of the mechanical actuator mathematical model, the hinge moment is considered, and the coefficients of its transfer function are appropriately amended. For practical application, the Kalman filter is introduced to reduce the white noise in control process. The calculative results show that the precision of track and control is improved obviously.
The Modeling of Multi-State Deformation in Aircraft Panel Automated Riveting System
Authors: Li Xiao Ge , Zhang Kai Fu , Li Yuan
Published: November 2012

Automatic drilling and riveting process, in order to improve the quality of drilling and riveting aircraft panel deformation are needed for compensation. Due to panels in automatic drilling and riveting process with more posture, therefore, solving panel deformation of plates under more posture is important. This paper establishes aircraft panel in the automatic drilling riveting process multiple posture deformation model. Firstly, simplify the manner of support, locate and clamping between the panel and the splints, supportive of integral panel at each location are calculated using three-moment theory to provide data reference for spacing between splints. Then, deformation results are calculated using flat shell theory to provide data reference for error compensation in automated riveting system, thus, drilling and riveting quality are improved.
Design and Optimize the Supporting Structure of Large-Diameter Lightweight Mirror
Authors: Chai Wen Yi , Xie Yong Jie , Wang Wei , Wu Meng Yuan , Fan Xue Wu
Published: November 2012

This paper describe design and optimize of the lightweight primary mirror assemblies for the space telescope, aim at supporting structure of the primary mirror with an aperture of 530mm for the Cassegrain optical. We design three kinds of flexible support structure for the mirror, and numerical simulation analysis the accuracy of reflective shape for mirror assemblies on the ground test and in-orbit work environment, compare the results of analysis and optimize parameters of flexible structure, determine the final project and put it into production. The results show that the component should be aligned and tested in the same direction of the mirror optical axis and the gravity, the accuracy of reflective shape is PV<λ/25 and RMS<λ /125 (λ = 632.8nm), under the state ofΔ4oC temperature change, the RMS<λ/234 (λ = 632.8nm), the project meet design requirements of the optical system.
Research on Product Texture Bionic Design and its Application
Authors: Chen Wei
Published: November 2012

This paper presents several novel schemes on product texture bionic design and applications. The paper is organized as follow: It starts on concept of bionics design, methods and models, analyzed the process of bionic design. Several modern texture bionic designs will be followed. With these designs product texture may enhance its weight feeling, enrich its expression as well as conveys language. The floor, leather products, and beverage packaging boxes are applications in texture bionic design. With texture bionic design, which states as natural biological form, directly impacts on people's vision, to give a more intuitive, intimate, beautiful feeling. It also plays a pivotal role to modern environmental protection.
Application of DMAIC Tools for Locomotive Maintenance Optimization
Authors: Mu Guang Yu , Zhang Wen Xiao , Xue Dong Juan , Pan Lan Lan
Published: November 2012

The quality improving of locomotive maintenance service is studied based on Six Sigma. The maintenance service progress has been optimized by DMAIC mode. First of all, the quality problems have been proposed. Then, the factors which impact on quality of after-sales service are found by QC tools. Secondly, the main problems in the progress would be controlled conveniently. Finally, the improved maintenance services process is developed correspondingly. In order to ensure the quality of the maintenance in the delivery period, some measures are taken such as adjusting the allocation time in the repair process, developing a strict examination system. The result shows that the maintenance efficiency and customer satisfaction has been improved significantly.
The Application of CAD Secondary Development in 3D Parametric Graphic Design
Authors: Lu Ming
Published: November 2012

This paper introduces the principle of applying the embedded development tool Visual LISP in three-dimensional parametric graphic design in AutoCAD environment. With the parametric design of 3D straight-toothed spur gear as example, an elaborate description of the process and method of 3D parametric graphic design based on Visual LISP is presented.
Research on the Variant Design Method Based on the Integration of CAD/CAE
Authors: Wang Sha Na , Liu Fu Yun , Yang Yun Ze , Xu Kun , Jia Ning
Published: November 2012

Component variant design method based on parametric design technology and parametric CAE technology are discussed. Based on the integration of CAD and CAE, a variant design method with the function to satisfy engineering constraints is put forward. Using VC++ and Jscript as developing tools, CAD system (SolidWorks) and CAE system (ANSYS) are redeveloped and integrated. A variant design method based on the integration of CAD/CAE is realized. A prototype system of the above variant design method is developed. As an example, variant design of workbench of a machine tool is realized. The variant design method and the variant design prototype system are verified.
Effects of Wet Compression on Performance of Regenerative Gas Turbine Cycle with Turbine Blade Cooling
Authors: Kim Kyoung Hoon , Kim Kyoung Jin , Ko Hyung Jong
Published: November 2012

When water is injected at an inlet of compressor, wet compression occurs due to evaporation of water droplets. In this work, the effects of wet compression on the performance of regenerative gas turbine cycle with turbine blade cooling are analytically investigated. For various pressure ratios and water injection ratios, the important system variables such as ratio of coolant flow for turbine blade cooling, fuel consumption, specific power and thermal efficiency are estimated. Parametric studies show that wet compression leads to significant enhancement in both specific power and thermal efficiency in gas turbine systems with turbine blade cooling.
Explore the Design of Communication Products for the Aging Population
Authors: Niu Yu Meng , Hu Wei Ping
Published: November 2012

It can be seen through the analysis of communication products on the current market, for the universal issues that products used by the aging population such as the difficulty to see the interface and the operation is too complex for them etc. According to the characteristics of the aging population, their communication products should not only meet the basic functional requirements of the aging users, but also pay attention to their psychological needs, design the communication products with super large interface as well as easily operating system and so on in order to meet the special needs of the aging population.
Electroless Ni-La-P Coatings on 2024 Aluminum Alloys for Aircraft Structure
Authors: Huang Chuan Yong
Published: November 2012

2024 aluminium alloys are widely used in airframe construction.However,this series of alloys are susceptible to corrosion to limit their usefulness,In this study,electroless Ni-La-P alloy plating on aluminum alloy and the effects of pH value,temperature and concentration of LaNiO3 on deposition rate were investigated.Surface morphology and corosion-resistant of the electroless Ni-La-P deposits were evaluated.The results showed the corrosion-resistant in 5％ NaC1 solutions obviously enhance compared with original aluminum alloy using electroless Ni-La-P deposition method．
Preliminary Study on Formation Law Simulation of Filter-Cake in Slurry Shield at Meso-Scale Level
Authors: Wei Peng , Ni Xiao Dong , Li Ti Kang
Published: November 2012

In order to investigate the mechanism of mud membrane formation during slurry shield tunneling, mesoscopic particle flow method was carried out to examine the way of mud membrane forming in sandy soil stratum at granular level with combinations of the traits of (particle) discrete element model. This study showed that the type of mud membrane formed transit from mud cake to permeable mud cake zone with the increase of the diameter rate of strata soil and bentonite clay until an inability to form mud membrane in the same strata of the soil. Numerical simulation results and related laboratory test are in good accordance, it bear out that researching the It has been demonstrated that it is comparatively reasonable and effective to carry out research on the mechanism of mud membrane formation at a meso-scale level.
The Design of Novel Thermal Gas Mass Flowmeter
Authors: Jiang Jun Hao , Cao Shao Zhong
Published: November 2012

Aiming at the defects of current thermal mass flow sensor, we developed a novel thermal gas mass flowmeter based on the principle of constant power, which consists of semiconductor sensors and a microcontroller as the core controller. The design plan is carried out on the basis of simple structure and reasonable cost, which maximizes accuracy and reliability of the flowmeter. The experimental results verify that the flow meter is running well and achieves the overall performance goals of the plan.
Dynamic Analysis of a Ducted Fan UAV in Forward Flight
Authors: Zhang Wei , Fan Ning Jun
Published: November 2012

This paper deals with the dynamic modeling of a ducted fan vertical takeoff and landing (VTOL) unmanned aerial vehicle (UAV) and focuses on the dynamic characteristics analyzing in forward flight. A 6-DOF nonlinear model has been established in terms of the forces and moments and the model can be used in the structure and control system design.
Numerical Research on Flow Field Characteristics within the Slipstream of a Propeller
Authors: Duan Zhong Zhe , Liu Pei Qing , Ma Li Chuan
Published: November 2012

Numerical research on three dimensional flow field of a propeller and actuator disk model have been made. Under design conditions (headway 66.889m/s, revolving velocity 2575rpm）, the Slipstream flow field after Propeller is solved by RANS equations with structure mesh. Chosen 12 million mesh through verification of reliability analysis. The numerical result consists of the flow field and vortex field in the propeller slipstream. With comparison to the calculation result of standard strip theory and actuator disk model, it is shown that for light load propeller with the side small contraction of slipstream, in the slipstream cross section after 0.6R away from downstream of propeller rotation plane, the axial, circular and radial induced velocity coefficient by Prandtl’s blade tip corrected standard strip theory result; three dimensional flows numerical simulation and actuator disk model are well consistent. It verified the correctness of standard strip theory and also provided scientific basis for the correction of actuator disk model
Crystallization Behavior and Curie Temperature Properties of Al Doped Nd-Fe-B Based Nanocomposite Permanent Magnet
Authors: Halder Sudipta , Panda A.K. , Mitra Amitava , Mallick Amitava Basu
Published: November 2012

The work is primarily concerned with the development of nanocrystalline Nd-Fe-B, based permanent magnet with high Curie temperature. An alloy of composition Fe81Nd7Al2B10 has been prepared using vacuum arc furnace and subjected to using Melt-Spinning process for preparation of amorphous flakes. Differential scanning calorimetry (DSC) has been performed to determine the crystallization temperature and activation energy of the melt spun amorphous ribbons. Subsequently the melt spun ribbon was subjected to annealing at below and above the crystallization temperatures to identify effect of Al on the Curie temperature. It was noteworthy for the effect of alloying Al above crystallization temperature. The Curie temperature increases to by almost 1.3 times with increase in annealing temperature.
Structural and Infrared Spectroscopy Study of Chemically Synthesized Sn1-xCoxO2 (0.00 ≤ x ≤ 0.05) Nanoparticles
Authors: Sharma Aditya , Sharma D.K. , Sharma Kapil , Kumar Vipin
Published: November 2012

In this work, an effective and economic way of transition metal doping in tin oxide nanoparticles is presented. The x-ray diffraction (XRD) measurements confirmed that the SnO2 nanoparticles are of single phase with rutile structure. Transmission electron microscopy (TEM) micrographs show that nanoparticles exhibit spherical shape with size of ~4 nm. To check the incorporation of cobalt and its chemical bonding with oxygen, systematic FTIR measurements were performed. The stretching-vibration mode (A2u) of Sn-O and deformation-vibration mode (Eu) of O-Sn-O were found to be broadened and shifted towards the higher wave numbers in case of cobalt doped samples. The Co-O/O-Co-O modes of the stable phase of cobalt oxide (Co2O3) were not detected in any doped samples. The results indicate that cobalt is present in the tin oxide lattice and do not form any metallic clusters or its oxide phases.
Characterization of Plasticized PMMA-LiClO4 Solid Polymer Electrolytes
Authors: Sharma Rajni , Sil Anjan , Ray Subrata
Published: November 2012

In the present work, the effect of Li salt i.e. LiClO4 contained in composite plasticizer (PC+DEC) with three different concentrations on ionic transport and other electrochemical properties of PMMA based gel polymer electrolytes synthesized has been investigated. The electrolytes have been synthesized by solution casting technique by varying the wt (%) of salt and plasticizer. The formation of polymer-salt complexes and their structural characterization have been carried out by FTIR spectroscopic and XRD analyses. The room temperature ionic conductivity of the electrolyte composition 0.6PMMA-0.125(PC+DEC)-0.15LiClO4 (wt %) has been found to be maximum whose magnitude is 0.40×10-5 S/cm as determined by ac impedance analysis. The temperature dependent ionic conductivity of electrolyte sample0.6PMMA-0.125(PC+DEC)-0.15LiClO4 has further been investigated. Thermal analyses of electrolyte samples of all three compositions have also been done.
Modified Becke-Johnson Approach for Governing Half Metallic Ferromagnetism in Cr-Doped GaP DMS Compound
Authors: Saini Hardev S. , Singh Mukhtiyar , Kashyap Manish K.
Published: November 2012

The electronic and magnetic properties of Ga1-xCrxP Dilute Magnetic Semiconductor (DMS) compound at doping concentration, x = 0.125 has been calculated using full potential linearized augmented plane wave (FPLAPW) method. The exchange and correlation (XC) effects are taken into account by a semi local, orbital independent modified Becke-Johnson (mBJ) potential as coupled with Local Density Approximation (LDA). Our calculation shows that Cr induces the ferromagnetism in this compound and there is large half metallic (HM) gap appearing in the minority spin channel. We observed that mBJLDA potential enhances the HM gap by ~ 0.25 eV as compared to from its value in Generalized Gradient Approximation (GGA). The improved HM gap can be understood in terms of the mBJLDA-enhanced spin exchange splitting.
Synthesis and Characterization of Particulate SiCp Reinforced Al-Si-Mg Alloy Composite with Varying Si Content
Authors: Dhandapani P. , Ravi K.R
Published: November 2012

Amongst the Metal Matrix Composites (MMCs), Al-Si-Mg alloy/ SiCp MMCs are very attractive for their properties. But, the formation of brittle interfacial reaction product, Aluminium carbide has been one of the major concerns when these materials are processed by liquid phase methods. The extent of Aluminium carbide formation depends on various processing parameters such as temperature, wt% of SiCp, particle size of SiCp and chemical composition of the matrix alloy especially Silicon (Si) content. According to recent studies, various difficulties in finding the process parameters to get desirable properties of Al alloy/ SiCp MMCs as desired by the industries. Thus, in the present study thermodynamic & structural estimates in Al alloy/ SiCp MMCs under various process conditions, composition, microstructures were performed. The relatively low cost liquid stir casting technique is used in the production of Al alloy/ SiCp MMCs with varying Silicon content (0–7%) in the alloy matrix using process temperature 710°C. Aluminium carbide layer formation on SiCp surface, Critical Si content for Aluminium carbide separation from SiCp surface, eutectic Si formation, existence of near-dislocation segregation regions after formation of Aluminium carbide on SiCp surface and the equilibrium amount of Si to suppress Aluminium carbide formation were investigated using Transmission electron microscopy (TEM). The separation of Aluminium carbide from SiCp surface was observed after 3% Si. The equilibrium Si content of 7% was found to suppress the formation of Aluminium carbide with thermodynamic model and its significance has been assessed.
Application of Ball Indentation Technique for Mechanical Properties Estimation of Bi-Metallic Weld
Authors: Sharma Kamal , Khandelwal Harshit Kumar , Bhasin Vivek , Chhibber Rahul
Published: November 2012

This work studied the ball indentation test at room temperature to characterize the local tensile properties of bi-metallic weld joints. The weld specimens used were fabricated by joining between SA 508 Gr. 3 ferritic steel and Type 304LN stainless steel with Alloy 82 buttering on the ferritic steel side and Alloy 82/182 weld metal. The test results showed that yield stress (YS) of weld metal was slightly higher than that of Type 304 and smaller than that of SA508 Gr.3, and ultimate tensile stress (UTS) of weld metal was similar as those of Type 304 and SA508 Gr.3 base metals. Also, the values of YS and UTS of buttering layer (Alloy 82) were nearly same as those of weld metal. Heat-affected-zones (HAZs) showed higher YS and UTS values compared to their base metals.
Finite Substrate Effects on Critical Thickness in Epitaxial Systems
Authors: Kumar Arun , Subramaniam Anandh
Published: November 2012

During the growth of an epitaxial overlayer on a thick substrate (GeSi on Si), an interfacial misfit dislocation becomes energetically favourable on exceeding the critical thickness. In substrates of finite thickness, the value of critical thickness is altered with respect to thick substrates. Thin substrates can bend and partially relax the coherency stresses, thus contributing to the altered value of the critical thickness. The current work aims at simulating the stress state of a growing finite epitaxial overlayer on a substrate of finite thickness, using finite element method. The numerical model is used to calculate the critical thickness for substrates with finite thickness. Eigenstrains will be imposed in selected regions in the domain towards this end. Size of the substrate for which it is not energetically favourable to accommodate a misfit dislocation is determined from the simulations (i.e. the system remains coherent for substrates below this thickness). Important effects arising in the transition regime of substrate thicknesses are also investigated.
Modelling for SAW Square Butt Joints by Using ANFIS to Predict the Weldment Characteristics of Joint
Authors: Narang HK , Kumar A. , Mahapatra M.M. , Jha P.K.
Published: November 2012

Weldment characteristics like bead width, bead height, penetration and weldment cross-sectional areas are the factors that contribute the weld quality. Submerged arc welding (SAW) is mostly used to join the heavy structures around the world because of its high deposition rate and good weld quality. The present investigation deals with single pass double side full penetration SAW butt joints with process parameters for minimizing the welding distortions. The plates were without having any edge preparation and welded from both the sides using full factorial design of experiments with process parameters such that full penetration was achieved. The shrinkage forces from both the sides of the joints acted in opposite direction to minimize distortions. The process was modelled using adaptive neuro – fuzzy inference system (ANFIS) technique to predict the effects of process parameters on weldment characteristics and angular distortion of SAW butt joint. The ANFIS model has been developed on the basis of full factorial experimental data. The validation of ANFIS model has been also done for a number of test cases.