bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Prognostics and Health Management System for Self-Propelled Gun
Authors: Shao Xin Jie , Cao Li Jun , Liu Jin Hua , Ma Qiao , Tian Guang , Hu Hui Bin
Published: November 2012

Considering the encapsulation, tremendous working stress, complicated fault mechanism and process, an object-oriented architecture Prognostics and Health Management (PHM) system of Self-Propelled Gun is put forward to solve the difficulties in modern equipments’ maintenance decision and safeguard. The relative key techniques, such as fault characteristics extraction, system identification, data fusion among sensors, adaptive fault thresholds setting, intelligent fault inference mechanism and fault prediction mechanism are discussed in detail. Above functional modules compose the PHM system. Their mutual relationships and data flow are shown as architecture graph, which is the basis of PHM system establishment. Simulation verification experiments indicate that the proposed architecture can satisfy the requirements of standardization, hierarchy and evolvement, as well as reducing the maintenance cost and difficulties.
Experimental Study on Deck-Temperature-Rising Technology in Different Deck Area
Authors: Xie Cong Wei , Chi Wei
Published: November 2012

Deck-temperature-rising technology is the new technology that solves the antifreeze and deicing problems of ship deck. In this paper, the special experimental device was designed, and the influence laws of this new technology in different deck area were studied. Comparative experiments were done with the deck area at 18*22cm2, 26*22cm2 and 32*22cm2. The experimental results show that with the same initial temperature of water and deck surface, the deck area has significant impact on this new technology. The larger the deck area is, the greater the warming amplitude and the better warming effect can be achieved. For example, the warming amplitude is about 1.7°C as the deck area is 32*22cm2, while the warming amplitude is only about 0.6°C as the deck area is 18*22cm2. This conclusion will be valuable in further studies on this new technology.
Performance Analysis of Infrasound Sensor InSAS2008
Authors: Feng Hao Nan , Yang Yi Chun
Published: November 2012

It is known that earthquakes generate infrasound. The frequency spectra of the infrasound signals associated with earthquakes are concentrated within a wide frequency range (0.002-0.02 Hz), and have spectral tail extending up to the frequencies 0.1-1 Hz. Therefore, the dynamic characteristics of infrasound sensors should be chosen so as to capture main features of such signals. In this paper, the characteristics of infrasound sensor InSAS2008 developed by Institute of acoustics, Chinese academy of sciences, are described. Its performance indicators are listed and its frequency response is analyzed. The special construction in the mechanical design is developed to overcome drift problem caused by temperature variations. In addition, the infrasound sensor is not affected by nonlinear effects. The calibration results show that infrasound sensor works within a wide and flat frequency band.
Vibration Analysis of Pumps Units Based on Fuzzy Matter-Element
Authors: Huang Kun Rong , Wang Han Qing , Lin Guo Xiang , Tang Yong Hui
Published: November 2012

This paper analysises and evaluates vibration situation and gives the general procedure for vibration analysis of pumps units, which contain determination of each evaluation matter-element and comprehensive evaluation method based on matter-element. Evaluation matter-element is established by evaluation system of pumps vibration, aimed at a particular example. The factors affecting the vibration of the pump unit has three major factors of the mechanical, hydraulic, electrical, sub-factors of the three factors. According to the characteristics of the pump unit vibration and the current technical condition, the vibration is divided into five levels: most serious, more serious, normal, minor, and slight. The evaluation weight matter-element are established by using AHP, weight are determined by using the combination of AHP and entropy, finally comprehensive evaluation of pumps vibration performance is practiced. Thus, this evaluation is feasible and useful.
A Brief Analysis of Vibration on the Printing Area in Ordinary Offset Press
Authors: Yang Ming , Li Jin Yao , Chen Jia Cong , Kong Shi Jia
Published: November 2012

At the development of modern printing, vibration may course some products quality problems when increases the speed. Practical experience shows that the mechanical vibration of the offset press is an important reason to affect the print quality. Therefore, improving the vibration performance of the printing press and designing the structure of anti-vibration and noise reduction to improve the quality and speed of printing presses is an important issue in the press product development. This paper proposes some reasons and solution ideas of vibration on printing parts in ordinary offset printing machines.
The "Nexus" Teaching Method in Mechanical Engineering Courses
Authors: Wu Yang Fang , Sun Shu Li , Liu Hua
Published: November 2012

Advanced CDIO engineering education philosophy, emphasizing the design of integrated curriculum plans. Traditional mechanical engineering plan is hard to be increased the curriculum content and hours. A "nexus" method is proposed in this paper, through the redistribution of the available time and resources to achieve integration curriculum plans. Theory mechanics as an important course of mechanical engineering discipline is described in detail to implement the “nexus” teaching method. The professional learning interests of students is improved effectively, the bad habit of "learn a new course, forget an old one" for the college students is changed to a certain extent.
Study on Problems and Strategies of Personnel Training in Modern Logistics
Authors: Zhang Xiao Bao , Shi Hong Xia , Wang Tong , Qiu Yao
Published: November 2012

With the spread of logistics service, modern logistics has been the fundamental industry for supporting the economy development in China. The logistics capability has been the modern enterprises' core competitive ability. The development level of modern logistics industry has become the important index to measure the comprehensive competitiveness of a country or region.Compared with the launch of logistics service, the human resources especially senior executive administrators in our country seem in terrible demand, which is far from enough to meet the need of modern logistics’ development. The shortage of the talent is the bottleneck which restricts logistics’ large-scale development, and it’s also a problem which needs the academia to resolve. This paper analyzes our country’s main problems of personnel and the logistics training in logistics, and puts forward the strategies in the end.
Extending Mechatronic Innovative and Practical Training Curriculum to Sophomore Undergraduates
Authors: Huang Xue Mei
Published: November 2012

Extending mechatronic engineering education curriculum to the freshman and sophomore undergraduates is a new trend in China. Here extending our engineering education curriculum for mechatronics currently facing junior and senior to sophomore is considered in Education Innovation Foundation of Harbin Engineering University of China. Key issues and current philosophies executing by other universities for mechatronics practical training curriculum to freshman and sophomore are analyzed. Based on current teaching content of the curriculum, enhanced teaching strategies are proposed in order to accommodate sophomore of our university. Concrete content includes introducing multi domain modeling technique for plant modeling, GUI design facilitating modeling simulation and control implementation, and flexible and extendable model library development. The proposed approaches can facilitate extending our curriculum to the whole level of undergraduates in our university.
The Exploration and Practice of Applied Talents Cultivation Based on "Engineering with a Big E."
Authors: Wei Yun Gang
Published: November 2012

Based on the concept of the “engineering with a big e.”, takes the professional “wind energy and power engineering” as an example, this paper analyzes several main problems occurred in the process of engineering education and performs some exploration and practice of the applied talents cultivation respectively including the positioning of talent cultivation objective, the reformation of talent cultivation mode, the establishment of practice teaching system, the enhancement of teachers’ quality and t he obtainment of students’ self-study ability etc. which should provide the conference for the professional reformation and innovation. Also, points out that the future outstanding engineers must possess the “engineering with a big e.” and carries out the applied talents cultivation based on the concept should improve the talents quality and effect of engineering education and lay a foundation for cultivating the qualified even outstanding engineer.
Design & Research of People-Oriented Office Chair
Authors: Yang Hai Bo , Feng Yu Tao
Published: November 2012

Measurement method and model method are adapted to analyze harmonious relations between people in the sedentary state and office chairs in various parts by starting from human design perspective of the product and using ergonomics knowledge. The research aims to settle down the technical problems which related to design fitness by correctly applying the ergonomics theory. During design process should study and summarize the user-friendly design elements of health office chairs, methods and performance evaluation as well.
Study of the Modeling of Incentive Air Pressure Waves to the Human Ear
Authors: Chen Chun Jun , Nie Xi Cheng , Zhang Min
Published: November 2012

The variation of interior air pressure of high-speed train will lead to the discomfort of the human ear. In this paper, based on the four principle of modeling assumption, according to the structure of human ear and the mechanical properties of eardrum in the anatomy, the differential function model and transfer function model while the eardrum is under the action of the pressure are build in order to study the relationship between air pressure fluctuation and the comfort degree of the human ear. Under the action of the actual air pressure wave, combined with the interior air pressure comfort index, the simulation and analysis to the model are done, and then the quantitative relationship between the eardrum deformation and the comfort of human ear is built.
Influencing Factors for NOx Reduction by SCR
Authors: Chen Ling Shan , Sun Chen , Tang Chen Xu
Published: November 2012

At all-state test of SCR system，the maximum NOx emission value occurs at 1100r/min and 50% of The throttle opening degree condition. The NOx emission value is 2611.08ppm. During simulation research, Influencing factors such as urea spray, reaction temperature, space velocity and NH3/NOx concentration proportion are elaborated. During 0.4s simulation cycle, it shows better atomize results and better homogeneity. The reaction temperature on catalyst is kept at 319oC value which is helpful for continuous SCR reaction. NH3/NO concentration proportion is kept from 0.2 to 0.3, which NOx reduction rate is from 65% to 75% in accordance with test results on the base of 1200r/min condition. The research can provide references for optimization on compact SCR system.
Analysis of Low-Carbon Economic Benefits of Wind Power Projects in Yunnan Province
Authors: Gao Xing Qiang , He Wei Jun
Published: November 2012

Proceeding from the perspective of a low carbon economy, the author defined the concept of "Low-carbon Economic Benefits (LEB)" for the ground-breaking in the context of energy shortage and environmental damage. Through the establishment of narrow analysis model, the author first calculated the energy saving benefits of all planning wind power development projects in Yunnan Province. Taking into account the other social and economic effects of the wind power development projects, the author summed up the broad, low-carbon economic calculation model. A planning wind farm project in Yunnan Province as an example, the author estimated its energy saving benefits of a single wind power development projects. For generalized computing model, however, some indicators can not be quantified, and there is great uncertainty. This is worthy of the author to do further research.
Research on Planning of Logistics System in the Material Support Base for Emergency
Authors: Shi Hong Xia , Zhang Xiao Bao , Duan Zhi Jian , Yu Ge
Published: November 2012

The logistics system in the material support base for emergency is a complex system which is consist of a variety of storage and transportation areas, storage and transportation modes, equipment configuration and operating methods. The scientific and reasonable planning and design of the system is the key to constructing efficient logistics system. This paper put forward the methodology including the system orientation, capability planning and detailed planning. It also elaborated the principle and methods of the design of the storage unit in logistics system, the overall size and capacity planning, storage area, storage and transportation mode planning as well as the capacity of storage area planning. This provides a theory basis for the layout and construction of the logistics system in the material support base for emergency.
Artificial Bee Colony Algorithm for the Parallel Test Tasks Scheduling
Authors: Chen Lian , Xiao Ming Qing , Yu Hang , Zhao Liang Liang
Published: November 2012

Parallel test is the key technology of the NxTest technology and the parallel test tasks scheduling is one of the important part of parallel test. The mathematical model of the problem was introduced, according to the advantage of solving the problem of dynamic scheduling with artificial bee colony algorithm; an approach of parallel test scheduling based on artificial bee colony algorithm is brought forward. An example was given, the result of simulation shows that this algorithm’s constringency fast and the result has a high precision, it is an efficient way of solving the problem of optimized parallel test tasks scheduling.
Evaluation Method for Conceptual Design Scheme Based on Fuzzy Mathematics
Authors: Tian Peng Fei , Yan Shi , Li Bi Ru
Published: November 2012

Selecting the favorable conceptual design scheme is the first step to make a new product development (NPD) successfully. To guarantee reliability and rationality of decision-making about multiple design schemes in conceptual design stage under the impact of uncertainties and qualitative information, we have employed KJ method to cluster the evaluation factors into 5 clusters such as emotion, ergonomics, aesthetics, core technology, and impact; and fuzzy mathematics method to deal with uncertainties and qualitative information effectively. The weights of evaluation factors were calculated by analytical hierarchy process (AHP). Fuzzy mathematics method is the comprehensive evaluation method and quantitative analysis which based on the “maximum membership degree evaluation”. All design schemes are ranked and selected according to the multiple evaluation score of parts with their weights. Finally, a case study for decision-making is presented to demonstrate the application of the evaluation method.
User-Group Requirements Based Approach for the Standardization of Parts
Authors: Liu Dan , Gu Xin Jian
Published: November 2012

Standardization of mechanical parts across enterprise and in large scope is benefit to promote the reuse degree of parts and improve the specialization and co-ordination of industrial production. In this paper, a user-group requirements based approach for standardization of part is proposed. The main idea of the approach is to collect, statistic and analyze the users’ requirements of mechanical parts through the web-based parts library and then construct the evaluation index system to instead the traditional parts spectrum analysis which used in GT (Group Technology). The key steps and methods are discussed and the application case is introduced for verifying the proposed approach.
Development Trend of Car Painting Technology
Authors: Guo Qing
Published: November 2012

In recent years, a great amount of new car painting technology emerges. New wet on wet Aqueous compact coating process reduces energy consumption and improves process efficiency, which contribute to large decline in costs of car manufacturers. New nano face paint has higher performance than traditional paints in scoring preventing and resistance to body paint off. Prefilming technology gives rise to less environment pollution, facility investment, fast remodeling, which shocked the automobile painting industry. According to the current situation of painting in China and the international technology developments, this paper introduce development trend of car painting technology in terms of pretreatment, CED, floating coat, face paint painting, and film solidification.
Application in Testing of Bullet Ballistic Parameters Based on Linear Charge Coupled Device
Authors: Li Tao , Yuan Xiao Mei , Chen Li , Zhang Ning
Published: November 2012

Charge coupled device has many merits, which makes it to measure bullet parameters possible. This article starts with possibility of testing based on charge coupled device, then introduces the completed processing methods and algorithms, finally based on Matlab’s GUI, methods and algorithms integrated, through input parameters, the calculated result is seen immediately before you. This way has characteristic of simplicity and convenience. In order to make this testing system much easier and use convenient, Matlab’s GUI is used to obtain the aim. It can conclude that this testing system is very utility in test field.
Design and Analysis of Fan-Cooling for High Speed Permanent Magnet Machine Rotor
Authors: Xing Jun Qiang , Chen Lei , Zhang Qi , Ma Yun Fei
Published: November 2012

Compared with common permanent magnet (PM) machine, the high speed PM machine has smaller size and larger power density. However, owing to high-speed high frequency and small volume, the PM rotor is more easily to become overheated so that irreversible demagnetization of the PM is induced. Traditional cooling methods of machine directly cool the machine stator, the temperature rise of rotor is reduced through heat exchange among stator, air gap and rotor. Owing to rapid temperature rise of high speed PM machine rotor, the method of indirect cooling rotor does not effectively protect PM rotor from overheating. To directly reduce the temperature rise of PM rotor and the volume of machine, design method of fan-cooling for high speed PM machine rotor is proposed in this paper, that is, high speed axial fan rotating synchronously with the high speed PM machine rotor is designed. Finally, the temperature rise of high speed PM machine rotor with the structure of high speed axial fan is analyzed based on the coupling method of fluid-solid, the validity is verified.
Electrical Discharge Truing of a Vitrified Bonded Superabrasive Wheel with Electrical Conductivity
Authors: Iwai Manabu , Ninomiya Shinichi , Ueda Tokiteru , Suzuki Kiyoshi
Published: November 2012

With its high grit retention and easiness to true and dress, the vitrified bond is widely used as a bond material for cBN and diamond grinding wheels. By giving electrical conductivity to the vitrified bond, application of electrical discharge trueing/dressing and detection of a workpiece position by electrical contact sensing will become possible. And moreover, application of the vitrified bonded wheels to various types of electro-assisted grinding processes (electrochemical or electro discharge assisted methods) is expected. In this study, vitrified bonded diamond segments with electrical conductivity were manufactured experimentally by mixing the fine copper powders in the vitrified bond matrix. As a result of investigation into the electro discharge trueing performance in the die sinking and wire electro discharge machining, it was found that a vitrified bonded wheel could be formed by electro discharge machining only because the bond was electrically conductive. In addition, the electro discharge complex grinding utilizing electric discharge machining was applied to the PCD cutting tool materials using the electrically conductive vitrified bonded wheel, and confirmed that the grinding could be continued for a long time maintaining a stable grinding force.
Temperature Measurement in Ultrasonic Vibration Mill-Grinding of Ceramics with Infrared Thermovision
Authors: Qiao Guo Chao , Zhou Ming
Published: November 2012

An experimental investigation is reported of the temperature measurement for ultrasonic vibration mill-grinding of silicon nitride with infrared thermovision. The effects of machining parameters such as spindle speed, feed speed, cutting depth on the surface temperature of workpiece were investigated and the reasons for the trend of temperature changes were analyzed. From the analyses, it indicates that infrared imager technology is suitable for temperature measurement in ultrasonic vibration mill-grinding of ceramics and tool wear has an important effect on the measurement results.
Study on Effect upon the Roughness of Bearing Outer Ring from the Jet Pressure in the Strengthening and Polishing Process
Authors: Liu Hua , Tao Jian Hua , Liu Xiao Chu , Fei Xiao Jun
Published: November 2012

This paper first analyze effect upon the surface roughness on the bearing outer ring from the jet pressure in the strengthening and polishing process theoretically, and then verify the validation of the theory in experiments, finally, it is concluded that the jet pressure should be reduced and about 0.4MPa for better in the strengthening and polishing process, under the circumstance of meeting the roughness requirements and considering the various factors, so as to lay a foundation to further research the relation between the strengthening and polishing technology and the surface roughness on the bearing outer ring.
Traceability Method for Transmission Quality Problems Based on Contrast Analysis
Authors: Li Lian Zhi , Tsai M.Y.
Published: November 2012

In the traceability analysis of complex transmission quality problems, traceability method based on the contrast analysis was proposed, and traceability model about the quality of automotive gearbox assembly constructed based on the contrast analysis. By analyzing on data, it has been shown that this type of analysis had a clear traceability process, able to quickly identify problem stations, and rapid feedback to the assembly site so that making the whole line adjust correspondingly in a timely manner. It showed that: traceability method based on the contrast analysis is feasible and effective and persuasive in the traceability for transmission quality problems.
Study on High Speed Machining Strategies for Mold
Authors: Liu Yong Xia , Peng Ru Shu , Cheng Qiang
Published: November 2012

The advantages and current problems for the application of high-speed machining technology in mold manufacturing are discussed. The requirements of mold high-speed machining for tool paths are summarized. Using the software of Cimatron E7.0，the NC program of the outer mold for a car engine’s V8 intake manifold is analyzed and optimized designed. Programming technology and optional of cutters have been introduced in detail. In the high speed milling stages, using the new cutters, the hardened mold can be machined to reach the required size, shape and surface roughness, and the machining time is reduced greatly. The method of making high speed NC template based on the software Cimatron E7.0. is introduced. Using this method, the maching efficiency is improved greatly, and the mold’ s surface quality better.
Study on the Optimization of Conformal Cooling Channels for Plastic Injection Mold
Authors: Qian Ying Ping , Wang Yong , Huang Ju Hua , Zhou Xi Zhi
Published: November 2012

The cooling process of injection molding is a complicated process related to thermodynamics and hydrodynamics, and it has a direct impact on quality and productivity of injection molded parts. With increasing requirements on high quality of injection molded parts, the research on the design of conformal cooling channels of injection mould gradually becomes a popular subject. The paper introduced the process of heat transfer for plastic injection mold with conformal cooling channels and its feature; analysed the optimization of conformal cooling channels; A new set of design methodology and rules is developed.
Study on the Wetting Device of GMS-7 Spine Taping Machine
Authors: Ren Cong Cong , Cai Ji Fei , Cheng Chao
Published: November 2012

In order to improve the work performance of the GMS-7 spine taping machine,reduce the labour intensity of the operators and the spine taping cost,through giving an analysis of the spine taping papers’ water feed process of the GMS-7 spine taping machine,we understanded the spine taping papers’ water feed principle,which provided the theoretical guidance to use glue pot device instead the special Pre-applied water sol paper to reduce the spine taping cost.
Safety Inventory under a Periodic Review System
Authors: Ma'aram Azanizawati Bt , Kien Le Tran Trung
Published: November 2012

The objective of this paper is to derive and verify a formula for calculating safety inventory that satisfies a desired cycle service level in a periodic review system. Stochastic variables, including customer demand and supplier’s lead time, are assumed to be normally distributed. Independent demand items are considered and backorders are not allowed. After deriving the formula, a computerized model simulating a periodic review system is developed by utilizing Microsoft Excel. Hypothesis testing is employed to compare the desired cycle service level with the simulated cycle service level. The result of this paper shows that there is strong agreement between the derived formula and the simulation model. In other words, the derived formula is verified. Furthermore, this simulation model also allows prompt identification of the impact of changes in inventory policy on cycle service level and inventory cost.
Temperature Field Simulation of Ballscrew Whirlwind Milling
Authors: Li Yan Feng , Song Jian , Liu Shao Hui , Song Xian Chun
Published: November 2012

Ball screw is the key parts of NC machine, precise instrument and many kinds of mechanical devices. Whirlwind milling is a new and effective thread manufacture technology. This article studies the internal heat conduction equation of whirlwind milling ball screw based on Heat Transfer, calculates ANSYS simulation result. The simulation results show that the surface temperature distribution rule and internal temperature distribution rule of a ballscrew is consistent. The article analyzes the influence factors of the thermal elongation. It provides a basis for compensating the thermal deformation error of whirlwind milling ballscrew.
Fatigue Analysis of MW Wind Turbine Top Flange
Authors: Zhang Rong
Published: November 2012

On the basis of the finite element analysis model of the wind turbine flange, this paper studies the fatigue damage of the MW wind turbine flange, analyzing the fatigue stress of the wind turbine flange with MSC.Marc/Mentat software, realizing load simulation of flange fatigue case with Bladed software, and calculating the fatigue loading spectrum of the flange with the method of rain flow circulation count. The fatigue damage calculation method which combines the rain flow circulation count method with Palmgren-Miner linear cumulative damage law, is proposed to modify the S-N curve of the flange material according to GL standard. The result shows the method feasible and reliable which provides one more accurate analysis idea for the fatigue life of the wind turbine generator system top flange.
Ant Colony Optimization for Factory Layout
Authors: Zeng Xiu , Ma Qian Li
Published: November 2012

Factory layout is NP problem[1]. There are many methods to solve it ,such as engineering diagram, flow chart method, various heuristic algorithms, SA( simulated annealing) and GA(genetic algorithm) [2].ACO (ant colony optimization) is used to solve it in this paper. The logistics costs exist between two workshops that are treated as pheromone that guides ants to search the best solution. Smaller logistics cost is, stronger the two workshops of relation is. In the process of optimization theworkshop with low logistics cost is more likely to be chosen, which minimizes the system logistics cost. Compared with GA, ACO has the advantage in speed. The mean value of the solution, the best solution, the worst solution is better too. More the number of workshop is, more obvious the superiority is.
3-D Precise Modeling of Modified Gear Based on Visual Basic
Authors: Zhu Zeng Bao , Ji Jun , Li Can , Rong Ji Xu
Published: November 2012

The design process of involute spur modified gear is very complicated, especially the accurate mapping of the tooth profile curve, in which it must demands specialized knowledge to designers by procedural programming method. According to the tooth profile curve calculation method as well as its relationship with cutter, get the curve equation of involute and tooth root transition curve. Compiled each the program of the calculating curve of tooth profile by Visual Basic, and built the precision model of involute spur modification gear based on the SolidWorks through the secondary development. This paper realizes the parametric precise modeling of modified gear and improves the accuracy and automation level of the design of gear. It has important significance to the dynamic simulation of gear and interference inspection as well as finite element analysis.
The Research of Energy Saving Improved on Copper Anode in the Hydraulic System Based on AMESim
Authors: Gao Xiao Yan , Wu Zhong Yong , Wang Xian , Duan Zhen Hua , Qu Jin Tao , Liu Yun Han
Published: November 2012

In response to the awareness of environmental conservation-oriented society and low carbon economy , this paper puts forwarding the load sensing control that is applied to the copper anode shaping machine hydraulic system energy transformation in the light of copper electrolytic anode shaping machine hydraulic system energy conservation issues, through the shaping machine hydraulic system energy loss analysis, and then uses AMESim software for plastic machine load sensing control system performance simulation and analysis, in order to achieve the purpose of energy saving.
Investigation of Numerical Stability of Pipe-Flow Simulation under Strong Oscillation of Inlet Velocity
Authors: Yi Xiao Gang , Luo Chao , Li Dong , Zhang Zuo Liang
Published: November 2012

Pressure distribution inside a fluid-conveying pipe is significant information for reasonable pipe design or mitigation of pipe vibration caused by fluid impact. Generally, a steady solution of pressure information can be obtained based on traditional CFD simulation if the inlet velocity of pipe is time independent. Unfortunately, strong oscillation of inlet velocity often happens in real engineering operations such as fuel injection or pumping process. This paper focuses on the simulation of the transient phenomenon of fluid flow inside a pipe based on the time-dependant inlet velocity. A 2D numerical pipe with an elbow is built based on Eulerian scheme and structured mesh. It is found that numerical instability occurs and convergence becomes difficult if inlet velocity presents obvious cyclic oscillation with big amplitude. Numerical oscillation increases especially when inlet velocity decreases from a big value to zero. Traditional finite volume method and cavitation model are tried and numerical results show that the convergence can be improved evidently based on cavitation model although numerical instability can not be overcome completely.
The Innovative Design and Simulation Analysis of Small Savonius Wind Turbine
Authors: Cheng Chao Yuan , Wei Xiao Qing
Published: November 2012

Savonius rotor is a typical style of vertical-axis wind turbine (VAWT). A new innovative design of two Savonius rotors coaxially in the opposite direction is presented in the paper which is different from the traditional design. The traditional generator has only a pair of stator and rotor and matched with trational Savonius rotor. Enlarging the relative speed between the magnetic pole and the coil pole by making the two pole rotate in the opposite direction in the innovative Savonius wind turbine. In this way, it can enhance the power generation efficiency of the Savonius wind turbine. The fluid-solid coupling analysis for the Savonius wind turbine is used to calculate the power characteristics and efficiency of the wind turbine.
Study on Simulation & Evaluation of Radar Network Operation Capability in Complex Electromagnetic Environment
Authors: Chi Jian Jun , Luo Xiao Ming , Han Xue Mei , Wang Bian Wen
Published: November 2012

For research the radar network operation capability which are effected by complex electromagnetic environment, the paper modeling the radar operation capability cloud rules arithmetic in complex electromagnetic environment and radar network operation capability evaluation model. The operation capability of radar network, which are constituted by 3 radars in complex electromagnetic environment, is simulated & evaluated by Netlogo 3D. The result show that the operation capability of radar is impacted remarkably by complex electromagnetic environment, it could improve the operation capability availably by take the network mode.
Simulation of Spraying Trajectory Optimization for Helmet
Authors: Fang Qiang , Li Ke Tian , He Wei Feng , Tan Zhe Hao
Published: November 2012

Basis on a series of investigation and study, the rotation speed of helmet, the moving speed of spraying gun and spraying angle are of greater impact on the final spraying qualities than others. The spraying process of helmet is simulated with UG NX. After analysis for the spraying trajectories, the optimal speed of the helmet rotation and spraying gun movement are obtained. There are several coating thickness deposition model with a wide range of applications, such as the Gaussian model, finite range model, and β distribution model. Using MATLAB to test the path of the spraying, according to the simulation and adjusting the speed of helmet's rotation and gun's movement, the desired spraying result has achieved. In addition, users can know the approximate results before spraying.
Product Form Design Based on the Symmetry Principle of Gestalt
Authors: Tian Yun , Qu Zhen Bo , Kong Xiao
Published: November 2012

It is discussed that the symmetry principle of Gestalt is prevalent in nature and in product design. On this basis, a kind of method for form design is summed up which is guided by the symmetry principle of Gestalt. In the process of product form design, these stages need the guidance of the symmetry principle, such as function decomposition of the product, the arrangement of function modules and the configuration of function modules. In addition, it takes the vacuum cleaner as an example to show the specific application of this method.
Active Scalable Elastomer Mold to Ease Demolding of High Aspect Ratio Micro Features
Authors: Xu Yan , Yung Kai Leung , Liu Hang
Published: November 2012

To fabricate high aspect ratio micro/nano features, demolding is more challenging than filling of melt into micro mold as solidified micro features can be easily peeled off when demolding resistance is high. Besides using anti-stick agent, using deformable mold is a new solution proposed by the authors. This paper presents a setup for testing the deformable active mold. Experimental results on micro thermal molding with the developed mold deforming system prove that the new system can successfully demold high aspect ratio micro features that can not be produced with traditional metal mold.
Research on the Elastic Modulus of Single-Walled Carbon Nanotubes
Authors: Zheng Hong Mei , Yuan Zhi Shan , Wang Yu Juan , Jiang Zi Gang
Published: November 2012

The calculation of elastic modulus of carbon nanotubes is an essential prerequisite for future Micro-nano devices fabrication that based on carbon nanotubes. The interaction potential of C-C covalent bond in single-walled carbon nanotubes (SWCNTs) is described by Terrsoff-Brenner potential in this paper. The elastic modulus of SWCNTs is ranged from 1.1078TPa to 1.23789TPa with the diameter increases from 0.3176nm to 2.0626nm by molecular dynamics (MD) simulation. The critical diameters of armchair and zigzag nanotubes are 1nm and 0.6nm.The elastic modulus changes with the diameter of nanotubes increasing clearly when the diameter smaller than the critical diameter, but the value of elastic modules tends to convergence when the diameter of nanotubes larger than the critical diameter.
Experimental Inverstigation on Thermal Expansion Coefficients of SnO2 Thin Film
Authors: Wang Jing , Li Hong Lai , Liu Mei Hua
Published: November 2012

As a kind of wide band-gap material focused on in recent years, SnO2 thin Film with μm level has been widely applied in many fields such as solar cells, electric heating devices, transparent electrodes, and gas sensors, ect. This paper develops a real-time system to measure thermal expansion coefficients of SnO2 thin film, which can obtain directly surface morphology information of the samples. Micro-imaging and digital image correlation method is adopted to investigate the correlation by comparing the object surface image before deformation with that after deformation. Because of the lower demand for measurement environment and no damage to object, it’s easy to acquire on-line images, calculate synchronously and display real-time results. In the paper, thermal expansion coefficients of SnO2 thin film are determined in situ with change of the temperature. Both of ceramic and SnO2 thin film have shown anisotropy thermal expansion, thermal and residual stress appears between the ceramic substrate and SnO2 thin film as a result of thermal expansion coefficients mismatch. According to experimental results, the maximum stress values can be calculated between film and substrate and inside the substrate.
The Application of Fuzzy Synthesis Evaluation Method on Assessing Bridge Durability
Authors: Zheng Fei , Wang Yu , Zhang Pu Yang
Published: November 2012

Assessment of the structure durability of concrete bridge in service is crucial for determining whether their service performance is meeting the design requirements or not. In this paper we classify the whole structure of bridge into two levels, i.e.bridge structure and bridge components. A two-level-multi-index model for evaluating the durability of concrete bridges in service is established based on the dependent functions of various factors, in which the dependent functions are chosen in accordance with the difference of various factors affecting the deterioration of durability of components. In this model, the durability of the bridge is divided into five different fuzzy levels: intact, disrepaired, damaged, severely damaged, and dangerous. Finally, based on fuzzy mathematics theory, the durability level of a bridge in practice is evaluated by using the maximum subordination principle.
The Properties of High Strength Bolt Connection Pairs with Hot-Dip Coating
Authors: Peng Yi Liang , Li Guo Xin , Hui Lian , Xia Shan Jing
Published: November 2012

Hot-dip coating can improve the longevity of the bolt connection pairs, but may be influence the pairs on the torque coefficient and tensile load. The torque coefficient and tensile loads of three specifications, two strength degrees and two surface states with and without hot-dip coating bolt connection pairs were tested. The results showed both the mean and standard deviation of torque coefficient of the bolt connection pairs were enhanced in case of the hot-dip zinc process, deals with the lubricant MoS2 they were both decreased and closed to the standard values. By contrast, the tensile loads were unaffected by the hot-dip process.
Evaluation of Reinforcement Effects for Earth Cliff of Jiaohe Ancient City
Authors: Shi Yu Cheng , Wang Ai Guo , Qiu Ren Dong , Hu Ming Qing , Wang Heng Zhi , Liu Kun
Published: November 2012

The author adopted an in-situ test method of artificial arthquake survey to evaluate reinforcement effects of fissure grouting for earth cliff of Jiaohe ancient city in China. Based on field testing results of three fissures with different characteristics, we compared previous earth cliffs with reinforcement ones by means of grouting. Analysis results show that it is feasible to reinforce cliff by means of the composite method reported by authors, which jointly applies the grouting of Polystyrene (PS) material and the anchoring technology for fissure earth-cliffs of Jiaohe ancient city. Meanwhile, the composite method of reinforcement could obviously improve the integral strength of potentially dangerous cliffs. This means PS material should be a safety media to apply into the reinforcement and the author’s method could be helpful to protect the ruins of Jiaohe ancient city.
Structural Damage Detection Based on Generalized Flexibility Matrix
Authors: Li Jing
Published: November 2012

Based on the generalized flexibility matrix, a method for detecting structural damage is presented in this paper. The generalized flexibility matrix is approximately constructed by using the first frequency and the corresponding mode shape only. Then the difference of generalized flexibility curvature between undamaged and damaged state is used to detect the possible damaged elements. Finally, a numerical example concerning a simple supported beam is used to illustrate the effectiveness of the proposed method.
Research on the Optimization of Dam Foundation Seepage Control System
Authors: Wang Jun
Published: November 2012

The starting time of Dragonite hydropower station in Dadu River Sichuan delayed, which led to the depth of the cofferdam cut-off wall reduced in actual construction. In order to adapt to this situation, it’s necessary to optimize the processing scheme of sand layer dam foundation which is put forward in the feasibility study stage. Combined with the characteristics of engineering, considering to reduce or cancel the curtain grouting in coarse grain granite foundation of riverbed on the right bank in the feasibility stage design, this paper is aimed to study on the optimization design of Dragonite hydropower station dam foundation. The paper has not only a great guiding significance in engineering construction process, but also gives references to the similar earth-rock dam project for treatment of sand layer dam foundation and the arrangement of dam foundation seepage control system.
Mechanics Characteristic Analysis of Loess Metro Tunnel Structure in Soaking Surrounding Rock
Authors: Zheng Jia Jia , Wu Li Jian , Guo Run Gua
Published: November 2012

In order to understand the influence on stress of surrounding rock and lining structure in metro tunnel after the loess is soaking, based on the Xi'an Metro Line 2, with the help of numerical simulation program, choosing tow working condition: before soaking and after soaking to carry out comparative trial, combined with the field monitoring data, we put forward that: After soaking the surrounding rock around tunnel top and bottom have some tendency to squeeze in , while the left and right side have tendency to run away, as far away from the tunnel ,the internal displacement of surrounding rock educes gradually; Inside the soaking zone, the maximum principal stress of surrounding rock after soaking is bigger than before, while outside the zone, it's contrary; After soaking the maximum bending moment and axial force of lining increases 7% and 15% respectively, and the rockbolts bear compressive force, they lost the supporting effect almost. In a word, if heavy rain floods into loess surrounding rock suddenly, in short time the metro tunnel is safe and stable, while for a long run, not timely waterproof and drainage will bring to the metro operation potential risk.
Water Jet Vacuum Dust Suppression Device Used to Tunnel Development
Authors: Jian Liu , Na He , Wu Yin Wen , Jin Liu
Published: November 2012

At present domestic tunnel construction, dust is one of the main factors which impact the production efficiency, safety clean production. It not only pollutes the environment, but also threats the health of workers. This article start from the tunnel dust prevention, control measures, heading face negative pressure control dust, and spray jet with the dust, to do research about the mineral water jet dust negative pressure technology. Combining experiments and field test methods, Study the dust fall mechanism of the tunnel water jet vacuum dust suppression, the device parameters and the effect of dust, the application of the technology has great significance to reduce the dust concentration of tunneling face and improve the working environment of workers.
Water Inflow Quantity Evaluation and Prediction for Cimushan Tunnel
Authors: Jin Xiao Guang , Jin Yu Juan , Tang Hao Feng
Published: November 2012

Tunnel excavation breaks the original hydrological dynamic balance, promotes water cycle and influences the mountain groundwater system to some extent. Water inflow during construction not only threatens construction safety, but also affects surface vegetation’s growth. Taking tunnel 1 in Chongqing Cimushan area as the project background, and through analyzing the hydrological test results from tunnel exploration stage, counting the actual water inflow quantity in construction period, doing the 3-D finite element numerical modeling, we analyzed and evaluated the tunnel water inflow quantity, to provide reference for recognizing the harm of groundwater and making treatment measures.
Studying the Three Dimensional Excavation Effect Affecting the Monitoring Displacement of Metro Station
Authors: Song Zhan Ping , Liu Jing , Jiang An Nan
Published: November 2012

In tunnel construction process, Because monitoring points setting always get behind with tunnel heading and occurred space effect which induces displacement loss and affects the monitoring accuracy. Studying tunnel space affect has important meaning to the monitoring data analysis. The paper takes Dalian Metro Station as research back ground, adopted three dimensional elastic-plastic numerical test method and carried out the excavation process simulation. Studied the convergence displacement and sedimentation displacement variation regulation along with the distance to tunnel heading face. The simulation results state that the nearer to the tunnel heading, the displacements of surrounding rock are smaller. Analyzed the ratio of displacement loss induced by space effect and amended the monitoring displacements of Dalian Metro Station.
Forecast Geological Prediction for Fault and Water Gushing in Deep-Buried Super Long Tunnel
Authors: Jia Yajie , Li Ya Lin , Huo Liang
Published: November 2012

A kind of geological disasters such as fault and water gushing often occurs during the informational construction of deep super long tunnel, which brings momentous disaster and economic loss to construction safety, so the precise and immediate advance forecast to the situation of fault and water gushing has an important theoretical significance and practical value. The theory of geological survey method, TSP(tunnel seismic prediction) method and GPR(ground penetrating radar) method are summarized and analyzed, forecast geological prediction process for fault and water gushing in deep-buried super long tunnel is formulated with the combination of the three methods. Then a deep super long road tunnel named Da Xiang Ling is detected by using the process synthetically, which gains good prediction results. It has a certain guiding significance to similar projects.