bluuebunny/crossref_metadata_2025 huggingface dataset:
The Development of Brake Three-Dimensional Parts Library Based on CATIA
Authors: Yang Bo , Wang Bin , Guo Xue Xun , Ye Peng , Zhang Jie
Published: November 2012

In the past, when need to draw one model of brake parts, users have to use the CAD software and make it one step by step, which wastes a lot of time and energy because of the repetitive artificially drawing. In order to improve the efficiency of drawing the models of brake parts, the paper builds one brake parts library by using the Visual C++6.0 and doing secondary development on the CATIA. Through one example, the paper proves the feasibility of building brake parts library.
Rotation Distortion Invariant Image Recognition Based on Fractional Correlation
Authors: Wang Hong Xia , Li Pan Shi , Zhou Zhan Rong , Zhu You Zhang
Published: November 2012

In this paper, a fast algorithm for fractional Fourier transform was proposed based on the theory of fractional Fourier transform, the fast numerical calculation of the fractional Fourier transform and fractional correlation was realized using MATLAB language. The characteristics of rotation distortion invariant image recognition based on fractional correlation were analyzed and compared with the traditional correlation. The results show that the quality of the fractional correlation peak is obviously improved. When fractional order P = 0.7, the fractional correlator can realize rotation distortion invariant image recognition within the scope of 15°.
Slope Stability Comparatively Analyzed with 2D and 3D FEM
Authors: Liu Jie Qun , Liu Jin Long
Published: November 2012

A typical slope has been comparatively analyzed with 2D and 3D FEM, it is showed that the length of surface load at top surface of slope shorted, the stability factor of slope of 3D model increased, which is far more than that of 2D model. In a certain degree, the safety factor got by 3D model is bigger than that of 2D model, so the safety factor of slope is underestimated by 2D model analysis sometimes.
Querying Deep Web Based on User Query Schema
Authors: Li Yi Min
Published: November 2012

In the context of data integration on the web, traditional data integration system lacks scalability, flexibility, is no longer adequate. A novel data integration architecture, UQSIQ, is proposed, which achieves web-scale data integration. Key components in the system are introduced. UQSIQ maps user query schema to a suitable domain, selects web databases, querys and then ranks results. Key techniques, domain mapping and user query schema matching, to handle the scale and heterogeneity of structured web data are described.
Weight Adjustment Technique in the Deep Web Data Source Classification Applied Research
Authors: Dong Jia Qiang
Published: November 2012

The Web database's classification is the key step which integrates with the Web database classification and retrieves. The traditional search engine is unable to correct search for the magnanimous information in Deep Web hides. This article has proposed one kind of classification based on machine learning's web database. The experiment has indicated that after this taxonomic approach undergoes few sample training, it can achieve the very good classified effect, and along with training sample's increase, this classifier's performance maintains stable and the rate of accuracy and the recalling rate fluctuate in the very small scope.
Development of Intelligent Pattern for Modeling a Parametric Program for Public Space (Case Study: Isfahan, Mosalla, Iran)
Authors: Mahdavinejad Mohammadjavad , Ahmadzadeh Siyahrood Sanaz , Ghasempourabadi Mohammadhossein , Poulad Mona
Published: November 2012

Islamic arts consist of several parts and could be noticed in works such as tiling, plaster works, stalactite work and etc. As well as in windows templates, wooden doors. The geometrical patterns as a part of Islamic arts have a ground for parametric program. This paper studies about the patterns that have emerged from Iranian traditional geometry and possess the ability to be changed into an intelligent pattern; followed by assessing characteristics that would make them parametric. The results were compared with Isfahan Mosalla, as the largest complex of metal shell with the dome-shape special structure that includes single welded mesh layer with nodes works and net pattern of classic wooden window, as a case sample. In conclusion, the reason of using the pattern worked in ceiling structure of the building has been discussed. This building is one of the valuable works that fairly reveal joining local architecture patterns with space-work structures system. Keywords: Intelligent pattern, Modelling, Parametric program, Islamic pattern.
Retrospective Research: Analysis of Liver 31P Magnetic Resonance Spectroscopy Combined with Support Vector Machine
Authors: Liu Qiang , Wang Shao Qing , Yu Dong Yue , Liang Guang Ju
Published: November 2012

Abstract. Support vector machine is in the statistical learning theory developed on the basis of a new kind of machine learning method, field in pattern recognition in a wide range of applications. Artificial intelligence technology has been widely used in medical field. Among them, the support vector machine (SVM) technology can mass of data for feature vector extraction.31P(Phosphorus-31) magnetic resonance imaging in clinical spectrum analysis, facing mass data, can use the support vector machine (SVM) of31P magnetic resonance spectroscopy data modeling, used in liver disease classification of common nodules, this experiment set up three research object: hepatocellular carcinoma (HCC), liver cirrhosis and normal liver tissue. Through the kernel function based on polynomial and RBF kernel function of support vector machine classifier carries on the comparison, and get three liver classification recognition rate. Experiments show that based on31P magnetic resonance spectroscopy data of support vector machine (SVM) model can be classified to living liver diagnostic forecast, so as to improve the31P magnetic resonance spectroscopy on HCC diagnosis accuracy rate.
Study of Digital Campus Construction and Application
Authors: Fu Wei Hong , Li Wan Chun
Published: November 2012

Since campus network has become the most important infrastructure for universities, the digitization, networking and informatization of campus have become the important indicator for measuring university management level and comprehensive strength. In view of the present situation for the development of digital campus, the strategies for digital campus construction and management have been put forward in this thesis so as to promote the rapid development of digital campus based on the overall understanding for digital campus construction.
Micro-Macro Modeling for Systems Biology with MR-DEVS
Authors: Gao Jie , Li Yuan , Wang Yong Gang , Chen Gang
Published: November 2012

System-level understanding, which provides specific views on the system of interest focusing both on a macro and on a micro view, has been a recurrent theme in systems biology modeling. However only little work has been done to directly support the micro-macro linking explicitly in a modeling formalism. Multi-resolution discrete event systems specification (MR-DEVS) was introduced to model biology at system-level. MR-DEVS can model upward and downward causation and adapt to represent those systems with emergence and controlling relationship between the micro level and macro level in a biological system. Moreover, MR-DEVS is closed under coupling. And so, it can also model biological process at multiply level hierarchically and modularly.
Using DNA to Solve the Minimal Vertex Covering Problem
Authors: Yin Zhi Xiang , Li Qing Yan
Published: November 2012

Plasmid DNA algorithm of the minimal vertex covering problem is proposed upon the basic idea and operation of plasmid DNA computing model. In the plasmid DNA algorithm, though an appropriate encoding and the basic biological operation, we finish the generation and separation of solution. On the basis of the molecular biology methods, the algorithm is feasible.
Biorecognition on the Surface of Patterned Silicon/Silica and Gold/Silica Slide
Authors: Nie Li Bo , Chang Hao , Chen Zhu , He Quan Guo
Published: November 2012

As the substrates of biosensor or biomicroarray, silicon, silica and gold matrixes are usually used as the surfaces of bio-recognition. In this research, designed micro-patterned silicon/silica slide and gold/silica slide were utilized respectively as the substrates of DNA and protein detection. The results suggested the detection limit of protein and DNA on silicon/silica slide were 10 μg/L and 10 pM respectively, and those on gold/silica slide were 10 μg/L and 100 pM respectively. The patterned silicon/silica and gold/silica slide could be used as the support of bio-microarray in high-sensitive biorecognition.
Digital Testing Methods of Virtual Prototype and Applied Research Facing to Product
Authors: Wang Zuo Jie , Tan Zhi Hong , Liu Li Bing , Wang Zheng Jie , Zhang Song , Tan Yang
Published: November 2012

There are many limitations depend on traditional physical product testing methods. Firstly, the cost is high and adaptability is poor. Secondly, the test is lag and it can’t follow the new product design’s beat. Thirdly, it can’t converge with digital design method, and it difficult to meet with the requirement of industry information. Study a product’s digital test method which based on modern design technical, and discuss simulation testing technical come true which face to virtual prototyping of bag filter, and aiming at digital testing result of bag filter main working capability prove feasibility and effectiveness of this method. Firstly, analyses components of digital virtual testing system and theory of working, and provide design model of virtual prototyping testing and testing progress how to come true, and by changing the condition of working simulation, and sampling, and data processing, acquire the result of dust gas uniformity which is design prototyping of bag filter. Application prove that digital process, face to digital testing of product virtual prototyping, by testing object and testing instrument and testing progress, and so on, adopting model simulation, digital simulation, calculate experiment, simulate testing technical, complete prototyping testing working under fully virtual state in computer. Let prototyping design quality controlling which is based on quantizing move forward. Achieve parallel designing and testing, which is full with the zero-cost, zero-lag, zero error of large and complex mechanical equipment design testing.
Research on KBE System of Intelligent Digital Prototyping Assembly Sequence Planning Based on NX
Authors: Dou Sha Sha
Published: November 2012

The purposed research joins back-propagation neural network (BPNN) algorithm, using NX/KF second development module to create feasible assembly sequences KBE system access the volume, weight, feature, relationship number and total penalty value, and predict the feasible assembly sequence via a robust BPNN engine.
The Security Mechanism for Internet of Things Networks
Authors: Hu Zhi Hua , Chen Wen Lue
Published: November 2012

In recent years, with advances in microelectronics technology and Internet of Things technology which promote the rapid development of low power, low price, multifunction sensor, and it also contributed to the development of Internet of Things. Internet of Things can used in military, medical, commercial areas. Characteristics of Internet of Things, this paper mainly described the security threats in the communication process, and analyze its security needs and to take security mechanisms to ensure the security of wireless communications
The Research and Implementation of TCP Measurement Technology
Authors: Li Xia , Wang Sheng Xun
Published: November 2012

This article gives the outline of the method of TCP measurement, and the open source codes are combined to make the active measurement for TCP into reality. Some network parameters such as throughput, bandwidth and TCP windows size can be measured to show the performance of the network. Accordingly the network stream can be observed, the network capacity and the performance is determined so that the network can provide higher QOS.
Smart Part with Internet of Things Technology
Authors: Zheng Rong Mao , Xu Yue Hua
Published: November 2012

With China's rapid economic development, electricity as one of the major energy demand gradually increased. Lots of energy were waste because of wide spread chaotic energy management. In order to solved this problem, in this paper a general schematic of intelligent node was proposed. Smart LED light and wisdom lamp socket were designed, which was been used in indoor public lighting control. A topology diagram was given with smart parts of public lighting, which was used to transformation a traditional public lighting circuit structure. Practice shows the transformed public lighting which control more flexible and smart than the old one, and reduce the power loss save 15.9% electricity costs. Equipment maintenance costs significantly reduce, the rate of fault found timely increased substantially.
The Research of Clothing Identification Based on RFID Technology of IOT
Authors: Luo Xiao , Guo Fei
Published: November 2012

Radio frequency identification (RFID) technology is a kind of the non-contact automatic identification technology. Clothing identification has many and complex characteristics, the existing clothing identification method have many defects. In order to adapt to the mass production demands of modern clothing enterprise, this paper puts forward the new clothing identification method based on RFID. And the anti collision algorithm is the key and prerequisite technology to identify targets correctly. Thus, based on the study of the existing anti collision algorithms, we discuss the problem of tags’ collision, analysis and contrast the existing algorithms. And then, the paper proposes the new anti collision algorithm. According to the improved algorithm, the labels are divided into several groups, and then identified correctly by the group identification algorithm. By the results of recognition result, we can estimate the number of the labels in the appointed area, and adjust the algorithm corresponding. The simulation results show that the algorithm is much better than the traditional anti ones.
Research on Influencing Factors of Enterprise Network Resource Coordination
Authors: Shi Yong Gui , Li Hai Xia , Xin Xue Shuang , Yan Jian Fen
Published: November 2012

Enterprise network refers to the summary of relationships based on common social and cultural background and the basis of mutual trust, connected with information technology, and forged by a group of interconnected enterprise behavior actors and institutions in the process of sharing resources, exchanging resources, and delivering resources in order to respond to market changes quickly. It represents a new organizational structure different from traditional hierarchical organization form. Enterprise network is the innovation of enterprise organizational form, which is beneficial for enterprises to obtain external resources, form rapidly, and maintain a lasting competitive advantage. But because each enterprise in enterprise network is an independent corporate entity, they occupy a certain resources and have a certain decision making authority, it is necessary to establish effective coordination mechanism to improve the performance of enterprise network. The influencing factors on the enterprise network coordination mainly include the structure of the enterprise network, information exchange among enterprise network behavior, trust degree, coordination cost, cultural compatibility and enterprise network environment.
Application of the Level Set Method for Propagation of Small Curvature Bending Detonation Wave
Authors: Zhang Li , Wu Kai Teng
Published: November 2012

Based on the detonation shock dynamics (DSD) theory, Level Set method for propagation of detonation wave was researched. In order to compute the propagation of small curvature bending detonation wave accurately, and according to characteristic of the Hamilton-Jacobi equation, the unstructured quadrilateral and Galerkin finite element difference scheme for solving Level Set function equation was studied.The finite-element code LS-DYNA was used to compute the experimental models about the propagation of detonation wave and the motion of flyers driven by explosive. The computation results are in good agreement with the experimental data. The results indicate that the difference scheme is of high accuracy and universal application.
The Research of Special Laboratory Timetable Algorithm and Solving Conflicting Method
Authors: Guo Jun En , Zhang Hong Xia
Published: November 2012

The laboratory timetable problem is an NP combinatorial optimization problem, and it is difficult to get the optimal solution. Under the traditional timetable algorithm, classes are arranged by week, and it is fixed and regular that when and where classes are arranged. Whereas under special laboratory timetable algorithm, teachers need book in advance, classes are arranged by term, and it is very flexible and random. So the traditional timetable algorithm cannot solve the problem of the laboratory timetable. In order to solve this problem, a special laboratory timetable algorithm and a solving conflicting method are presented in this paper. It has been proven that it is a better solution to the laboratory timetable problem, saves a lot of time for the laboratory personnel and is worth further promote the application.
Stream-Based Short-Term Demand Forecasting Model Using ARIMA
Authors: Liu Tao , Chen Rui Min , Xiao Yong , Yang Jin Feng
Published: November 2012

Short-term load forecasting for streaming load data is an important issue for power system planning, operation and control. Smart meters of Advanced Meter Infrastructure distributed around the distribution power grid produce streams of load at high-speed. The collected data can be characterized as a non-stationary continuous flow. A stream-based short-term demand forecasting model based on ARIMA is proposed. This method is used to forecast hourly electricity demand for next few days ahead. The performance of this methodology is validated with streaming data collected in real-time from the power grid.
Research on Coordination in the Closed-Loop Supply Chain with Remanufacturing
Authors: Jiang Hong Wei
Published: November 2012

Based on game theory, this paper constructs closed-loop supply chain system with retailer recycling used products from the consumers incorporating difference between new product and remanufactured product. The optimal pricing decisions and the optimal profits of centralized coordinated and decentralized closed-loop supply chain are obtained. It is found that the efficiency of decentralized closed-loop supply chain decreases by 25%. Finally, the coordination mechanism is designed to solve the profit conflict in the decentralized closed-loop supply chain by the profit sharing contract.
The Supply Chain Management of Manufacturing Enterprises Based on the E-Business Environment
Authors: Huang Zhi Qi
Published: November 2012

Abstract：With the development of E-business, supply chain management of manufacturing enterprises becomes more efficient,making business transactions more simplified, and meanwhile, organizational structure is transformed into open flat network structure from a pyramid hierarchical structure. Therefore, it is essential that manufacturing enterprises view as a whole function processes various businesses inside the enterprises and between the nodes at the supply chain, comprehensively improve the level of human capital through the form of virtual enterprises and establish management teams with the innovation consciousness.
Thermal Error Modeling and Compensation of the Direct Driving Type A/C Axis CNC Milling Head
Authors: Zheng Peng , Liu Ling
Published: November 2012

The thermal error of direct driving type A/C axis CNC milling head in the practical processing is analyzed. Based on the theory of homogeneous coordinate transformation and small error hypothesis, the transformation matrixes between the coordinate system of kinematic pairs and the relationship between errors and compensations are obtained. The thermal error compensation model and the thermal error compensation system which embedded into the Siemens 840D system are established, and play an important role in increasing the processing accuracy.
Research for Rectangular Coordinate CNC Pipe Profile Cutting & Welding Integrative Equipment
Authors: Li Yu Qiang , Xue Kai , Yao Shi Lei
Published: November 2012

The rectangular coordinate CNC pipe profile cutting & welding integrative equipment is researched for the requirements of cutting and automatic welding of complicated butt pipes intersection lines. The mechanical structure of the equipment is that the workpiece is placed onto the supports, the chuck is carried out with limitless rotary movement. The main body for holding cutting torch and welding torch is adopted with cantilever arm traveling structure, and is controlled by six-axis digital AC servo system. The CNC system is developed based on Windows operation system, and it is a kind of pure software open architecture. RTX real-time extension technology is adopted to realize the high real-time requirement in motion control. The minimum deviation method is used to realize the interpolation algorithm of curve which describes the space track of intersection line. The equipment has realized the pipe cutting for blanking and welding for assembling at the same working position, and can meet the requirements for automatic pipe processing technology.
Application of UG-Based 5-Axis Linkage Numerical Control Machining Technology in Blow Mold
Authors: Gao Yong Xiang
Published: November 2012

5-axis linkage machining has been more and more widely used, but its programming and operation is relatively complicated. Directing at the structural parameters of the blow molds of beverage bottles, this paper proposed strategies for the multi-axis machining technology. And then this paper described the development process of the dedicated post processor of a certain model’s 5-axis linkage machine tool, and the generation of NC code needed by the machine tool, which realizes the multi-axis machining of blow mold.
Study and Exploration to the Brand Elements of the Numerical Control Machine Tool
Authors: Liu Yun Long , Chen Dong Xiang
Published: November 2012

This research analyses on the various design elements and the evaluation of levels through the visual level of the theory of product image for the machine tools. The study captures the image elements of machine tools through the way of qualitative perception and the quantitative analysis, forming the framework of product design to extract the product image model for more direct comparison and effective research. This thesis strengthens the brand building of machine tools from the point of product image design, studies in close connection with the characteristics of the industry and products, and makes a more specific and practical significance to the design theory for the specific product design, which is useful to clear the direction of product design for the machine tools companies, and thus shaping the product-based brand and enhancing the overall national level of competition in the equipment manufacturing industry.
Digital Design and Numerical Control Processing of Deflection Yoke Based on Top-Down
Authors: Lin Huan , Gao Dong Qiang , Shi Zhi Fang , Yi Jiang Miao
Published: November 2012

In this paper, it introduces the design processing and implementation method of digital technology based on Top-down, analysis the advantages of the method using Top-down in the product design. To deflection yoke for example, completed digital design and assembly of the deflection yoke based on Top-down, and completed the NC processing by using numerical control machine tool
Research on Assembly Precision of CNC Machine Tools Considering Characteristic Parameters of Glued Joint
Authors: Wang Song Ling , Lu Cong , Gou Ling
Published: November 2012

In order to evaluate the assembly precision of the CNC machine tools in different assembly sequences more accurately and effectively, this paper proposes a new assembly sequence deviation model and quality evaluation approach considering characteristic parameters of glued joint. A BP neural network model is established for predicting characteristic parameters of glued joint in each assembly step. The method is able to obtain the assembly sequence with best assembly quality and improve the design tolerance of parts.
Study on CNC Lathe Electric Turret Fault Diagnosis
Authors: Yan Cun Fu , Li Jian Wei , Liu Jun
Published: November 2012

Abstract. With the electric turret work principle, analysis the fault of the CNC lathe turret.Aimed at different fault phenomenon, the fault diagnosis method was proposed. Introducing the specific application of fault diagnosis method through specific cases, provide a theoretical reference for effective control failure and rapid troubleshooting
Virtual Prototype Construct of Agricultural Tricycle Based on Driver-Tricycle-Road
Authors: Han Xiang , Pu Sha Sha
Published: November 2012

On the basis of the tricycle rigid virtual prototyping model ,flexible body virtual prototyping model with dynamic characteristics was constructed via the addition of tricycle parts mass, inertial characteristics, elasticity of elastic damping components and conditions about damping, road and tyres. With the driver control model joined the virtual prototype of the tricycle and real-time feedback and regulation operated on tricycle snaking phenomenon, then driving conditions of the actual tricycle on the road was accurately simulated. As the simulation results suggested, the tricycle rigid virtual prototyping model could be applied to acceleration performance, braking performance, vehicle riding comfort and other simulation analysis, therefore, ideas were provided in further development of design manufacturing technology.
Application of Hybrid Fuzzy-PID Control with Coupled Rules in the Hydraulic Positioning System
Authors: Dong Li Hong
Published: November 2012

According to the nonlinearity and time-variation of the positioning control in hydraulic system, a kind of Hybrid Fuzzy-PID Controller with Coupled Rules (HFPIDCR) is proposed. In this control system, the bulk modulus is considered as a variable. The novelty of this controller is to combine the fuzzy logic and PID controllers in a switching condition. Simulation results of the HFPIDCR are compared with the results of traditional PID, Fuzzy Logic Controller (FLC), and Hybrid Fuzzy-PID Controller (HFPID). It is demonstrated that the HFPIDCR has fast response, short adjustment time, high control precision and other advantages, and it can meet the requirements of the positioning control in hydraulic system.
Research and Practice on the End Face Cylindrical Cam NC Machining Technology
Authors: Huang Jie , Liu Hong Jun
Published: November 2012

This paper discussed the CAD / CAM technology of the end face cylindrical cam. The processing of end face cylindrical cam which used in textile machinery was analyzed, and the Processing plan was determined. Three-dimensional modeling and NC programming were done by respectively using PRO/E software and CAXA manufacture engineer software, machining accuracy, fixture and other key technical problems in the end face cylinder cam CAD/CAM process were solved. Acceptable product was processed in common three coordinates milling machine, and ultimately used in enterprises, and achieved good results.
Open Architecture of CNC System Based on STEP-NC Data Model
Authors: Wang Guo Xun , Shu Qi Lin , Wang Jun , Wang Wan Shan
Published: November 2012

A kind of novel open architecture CNC system is put forward based on the key hardware ‘‘PC+PMAC controller’’. The intelligent CNC system is divided into four layers, the field bus is used in it for openness and interoperability. The system software including several functional modules is developed based on COM for reuse and reconfiguration. The proposed open CNC system is based on STEP-NC data model, which aim to provide higher-level information for process control. The framework presented can be used as a reference for STEP-compliant CNC.
PLC Application in Electrical Control and Fault Diagnosis of Milling Machines
Authors: Zhao Xiu Ping , Li Wei Hua
Published: November 2012

In this paper, a PLC of FX2N series is used in the redesign of an existed electrical relay - co contactor system. Designing of fault diagnosis system is introduced and together with it relative programs are given. These technical reforms achieved remarkable improvements in simplifying the circuit of the machine system, in enhancing its operation reliability, in increasing the efficiency of fault diagnosis, and in lightening the workload of maintenance staffs.
Study on the Virtual Instrument for Coaxiality Error
Authors: Chen Li Jie , Zou Ping
Published: November 2012

Used LabWindows/CVI as software platform, existing apparatus in laboratory and a data acquisition card as hardware platform, the virtual instrument for coaxiality error was developed. It combines the theory to measure form and position error with technology about virtual instrument. Coaxiality error by least square method and the minimum zone method is measured. The image of coaxiality error can be displayed on the screen to analyse the causes of error, so as to control the manufacturing error. The virtual instrument has the advantages of high precision, stablity, low manufacturing cost, especially the excellent function expandability. It can be used for experimental teaching and the actual production.
Combined PWM Motor Control Study and Application in EPS
Authors: Shen Bin , Ji Peng Kai , Ren Sha Sha
Published: November 2012

The power switch circuit of electrical power steering (EPS) is analyzed. A kind of PWM hybrid control algorithm combining the Unipolar reversible PWM mode of brush DC motors with its bipolar reversible PWM mode is put forward in this paper to improve the performance of current EPS system. The basic switch principle between Unipolar and Bipolar PWM mode is that the voltage during the switch process remains constant. The switch process and practical application of DC motor with Uni-Bipolar hybrid control mode in EPS is analyzed. The results show that PWM hybrid mode has exhibited good performance in vehicle electric power steering system.
A Study on Leakage Diffusion of Double-Layer Structure of Oil Storage Tank
Authors: Liu Fu Jun , Zhao Li Wei , Qian Yue Qiang
Published: November 2012

A double-layer structure of oil storage tank was proposed in this paper to overcome the shortcomings of existing oil storage tanks and its detection method. Using 93# gasoline, diesel and water as working medium, the leakage diffusion characteristic of tank floor was researched based on a experimental system. The research results testify the reliability and sensitivity of the experimental system. Furtherly, the influencing rule of leak positions and leak volume (Q) on the leakage diffusion was studied by using 93# gasoline. The results show that for the same amount of leakage, the leakage on the center of tank floor diffused quickly, was the most easily detected part; and that on the edge of the tank floor was the most difficult to be detected. For leakage occurred in same position, the volume fraction (φ) in pipeline increased with the increase of leakage. The result of research has a great significance for fastening localization of double bottom structure of oil storage tank.
The Significance of Vibration in Concrete Mixing
Authors: Shen Hong , Duan Zhi Shan , Li Fei
Published: November 2012

With a wide range of applications of vibration technology in mechanical engineering, the vibratory mixing has been a hot topic and one of concrete mixing mechanical’s development directions. As the previous study of the significance about vibration used into concrete mixing is only limited on the experience and the experimental data, the linear fitting of experimental data is made by using MATLAB language. Then, the impact and significance that of vibration and fresh concrete’s microscopic uniform density is analyzed.
Design and Realization of Performance Testing System for New Developed Hydraulic Pumps and Valves
Authors: Wang Cheng Long , Zeng Qing Liang , Zhang Xin , Liu Zhi Hai
Published: November 2012

In order to ensure the performance of new products, a performance testing system including the design principle, design of hydraulic system and establishment of the computer data acquisition and processing system is given, which can be used to simulate the actual working conditions of a variety of hydraulic components and also used for the loading test. According to application, it shows that the performance testing system can work as an effective approach for quality checking for the new produced hydraulic components before they were put into the market.
Research on the Virtual Test Technique of Tower Crane Jib
Authors: Li Bin , Xu Shao Shuai , Zhang Hong , Wang Fu Mian , Zhao Xin
Published: November 2012

With the development of construction technology, the increasingly high performance requirements for tower crane, its technical performance, strength and longevity is particularly important. The metal structure is an important part of the tower crane, which bears the dead weight of the tower crane and a variety of the work of external loads. Strength, stiffness and stability are used to ensure safe and reliable work of the tower crane; otherwise, major accident may happen. With the tower crane to the development of large, heavy load and ultra-high, the test of the structure is particularly important. The research on the virtual test technique of tower crane jib in this paper bases on the characteristic parameter extraction of the jib structure, using the parameterized APDL programming language of finite element software ANSYS to do statics analysis by model building, and complete the virtual text of the jib. Finally obtain the corresponding results data of the actual test inspection and the location as well as the virtual test value of the most dangerous point, to determine the safe reliability of the jib structure and the rationality of material use.
Studying on the Technique of Integration Analysis to Rigid-Flexible Mixture Virtual Prototyping in Complex Mechanic System
Authors: Lin Bin , Zhu Yong Kui , Cai Li Jun
Published: November 2012

Mechanical design have experienced a long process of development, the improvement of design method and optimization method have always been the pursuit of any designer. In recent years, introduction of CAD/CAE have increased greatly the speed of design and experiment, making mechanical design undergo a fundamental leap. However, the whole process: design-trial-improve- ment, still needs manual control to complete, designers still face the problem of complex repeating process. In views of this bottleneck, we will conduct parametric modeling on complex mechanical system in PRO/E, and let key parts import into ANSYS to be flexible .Then, we will build and analyze rigid-flexible mixture virtual prototyping in automatic dynamic analysis of mechanical systems. At last, we will integrate this process in ISIGHT3.5, exploring design-trial-improvement integrated optimization and simulation method through the optimization of the size of key parts of complex mechanical system.
Design and Test of Piezoelectric Resonant Diaphragm Air Pump
Authors: Xie Hai Feng , Yang Zhi Gang , Jie Meng
Published: November 2012

To improve the driving ability of gas and light fluid which is sensitive to the temperature change, based on the system resonant principle a novel kind of piezoelectric resonant diaphragm air pump has been proposed. Experimental results indicate that the maximum flow rate is 1650ml/min when the sinusoidal AC driving voltage is 200v, the vibrating spring thickness is 0.6mm, the adjusting spring thickness is 1.4mm, and it was 0.5 as the radius ratio of the rigidity transfer vibration piston and the diaphragm.
Restructuring and Analysis of the Overhead Crane's Span
Authors: Tian Guo Fu , Qiao Yang Yang , Sun Shu Hui , Zhang Yu
Published: November 2012

Due to the change of application site, the box beam overhead crane's span needs restructuring. An overhead crane span’s increase restructuring was analyzed by mechanics analysis method. The detailed calculation and feasibility analysis was done. It provides a basic theory for the equipment's restructuring design and analysis work.
Coal Gas Dehydration Equipment in Combined Cycle Power Plant
Authors: Xiao Li Chun , Ding Zhi Jiang
Published: November 2012

To reduce the moisture content of coal gas in combined cycle power plant, a new type dehydration equipment is introduced. The curved plate dehydration equipment is composed of many pieces of stainless plate which has some collection hooks at every corner. Meanwhile, a new method on measuring moisture in gas by using superfine fibreglass is introduced.The gas-water separation efficiency was calculated by the difference of moisture content before and after the curved plate dehydration equipment. The dehydration efficiency of curved plate in combined cycle power plant system was tested under different operating load, the results show that gas velocity and gas/liquid ratio have a great influence on the coal gas dehydration efficiency. If the washing water flow rate and pressure are changed, the efficiency will change at the same time. The moisture content is low when the spraying nozle works at a high water pressure. The operation water pressure and working voltage of electrostatic precipitator have been proposed by testing and analysis. It will have great advantage to the safe operation of turbine.
The Research on the Launching Consistence of Small Caliber Electromagnetic Railgun
Authors: Zhang Yi , Yang Chun Xia , Li Hai Yuan , Li Bao Ming
Published: November 2012

Electromagnetic railgun can perform precision strike in long range. It is obtained that the scatter of velocity must be exist because there are many effectors influencing launching process, for example, the manufacturing error, the initial value of launching parameters and uncertainty during launching process and so on. Among these factors, the parameters of armature are easy to adjust to ensure the consistence of velocity. So we attempt to apply Grey Analyzing Model to carry on the study, and then by means of the measurement of strain on the barrel to verify the model. The result shows that the reasonable matching of armature mass and diameter can be helpful to improve the consistence of armature muzzle with the other parameters the same. This method is a new attempt to study the stability and consistence of velocity of solid armature.
Design, Manufacturing and Pump-down Curve Simulation of High Vacuum Systems
Authors: Chung Tien Tung , Lu Chih Kang , Tu Yi Ting
Published: November 2012

This paper presents a vacuum system design for extreme ultraviolet lithography (EUV) and studies the prediction of pump-down curves for vacuum chambers. Related basic theories include gas laws, conductance for several kinds of flow regimes, equivalent length for pipes, outgassing, diffusion, and permeation etc. The simulation program consists of a MFC module and a MATLAB module. The MFC module is used to input necessary parameters, including start and target pressure for pumping, volume and inner surface area of vacuum chambers, configuration of pumping lines, performance of vacuum pumps, and gas loads. The MATLAB module deals with the pump-down curve calculation based on related theories. The governing equation of the conservation of mass in a pumped vacuum chamber is derived from extended Temkin isotherm. The pump-down curve of vacuum chamber is predicted by four steps, including calculation of equivalent length for pipes, conductance of pipes, and effective pumping speed of pumps, and pump-down time. An empty vacuum chamber is used to test the developed program. The pump-down curve reaches 6.5E-8 torr with 42 hours pump-down time in experiment measurement, and the simulated curve reaches 5.79E-8 torr at the same time point. The developed program can predict pump-down curve with a good accuracy in the range from low vacuum pressure to high vacuum pressure.
Research on Fault Diagnosis System for Aircraft Hydraulic Power Carts Based on Fuzzy Diagnosis Theory
Authors: Zhao Wei Qiang , Liu Yong Xian , Lu Mo Wu
Published: November 2012

Aircraft hydraulic power carts are important aviation support equipment. Because of their complex structure they have high failure rate. Therefore fault diagnosis system for hydraulic power carts is necessary to ensure high reliability and maintainability for hydraulic power carts. This paper presents a diagnosis method based on fuzzy diagnosis theory in the developing process of a new type of hydraulic power carts. The fault Symptom, critical value and fault causes are established based on the research of fault mode for hydraulic power carts. And also the mathematical model of fault diagnosis for hydraulic power carts is established based on fuzzy diagnosis theory. The practical test results and fault diagnosis instances show that with this fault diagnosis system fast fault diagnosis for hydraulic power carts was carried out successfully.
Experimental Study on Journal Gas Bearing with Axial Slot for a Miniature Air Turboexpander
Authors: Chen Ru Gang , Nie Ya Jun , Zhou Quan , Gong Chao , Chen Tao
Published: November 2012

A new type of hydrostatic journal gas bearing with axial slot of tangential gas entry for miniature air turboexpander is firstly developed in this paper. This bearing configuration is presented and constructed to fit manufacture simplicity. The experimental investigations are carried out to reveal the relationship between bearing parameters and instability threshold speed. It is feasible to increase the stability of hydrostatic journal gas bearing by adopting this kind of configuration with axial slot of tangential gas entry. Some valuable tested results are obtained to reveal the optimum slot height and radial clearance for this miniature air turboexpander.
Research of Product Family Design Techniques of one Workpiece Testing Equipment
Authors: Zhang Ji Tang , Cao Peng
Published: November 2012

One series of cone welding workpiece is a key part of certain critical equipment;we detected the weld quality and geometric error to ensure the high quality. This paper we research the straight weld, the girth weld ultrasonic testing equipment and geometric errors laser automatic testing equipment. Since the testing equipments have a certain degree of correlation, this article also draws on product family design thought, the modular and parametric technique to design the different testing equipments. The kind of design greatly improves the quality, reduces the manufacturing costs, shortens the research and development cycle, receives very nice results.
Deadbeat Direct Torque Control of Permanent Magnet Synchronous Motor Using Look-up Table
Authors: Liu Xian Xing , Fu Na
Published: November 2012

A new scheme of deadbeat direct torque control (DTC) of surface permanent magnet synchronous motor (SPM) is proposed in this paper. The main ideal is choosing the reference voltage vector in two phase stator reference frame previously and real-time calculating the pulse width of the reference voltage vector which diminish the error of torque. With the new scheme, the torque ripples were greatly reduced when compared with those of the basic DTC and the quick dynamic torque response of the basic DTC was still retained. Fixed switching frequency at different operating conditions becomes possible by this new structure. Simulation results verify the correctness and feasibility of this method.
The Current Situation and Future Prospect of Advanced Human-Machine Engineering’s Application in Coalmine
Authors: Weng Yi Fei
Published: November 2012

Coalmines’ productive activity demands safety, comfortability, efficiency and economy, which are just the features of advanced human-machine engineering. Then current situation of advanced human-machine engineering’s application in coalmine is summarized, including: operating devices of coalmine machinery are man-beneficial; “safe color” in coal mining machinery is applied; signals under coalmine are effectively released; noise environment in coalmine are improved. Finally, the future trends of advanced human –engineering are discussed: coalmine safe human-machine engineering, coalmine green human-machine engineering, coalmine virtual human-machine engineering, coalmine intelligentized human-machine engineering, and coalmine digital human-machine engineering, etc.
The Application of Roll Forming Technology in the Production of the Crane U Type Main Girder
Authors: Su Wen Ying , Liu De Ping
Published: November 2012

The traditional LD type electric single-girder crane beam is made from several U type grooves by welding them together. For many years, U type groove is usually made from 5mm or 6mm steel plate which is stamped and formed by rolling machine. Through analysis of the problems and the disadvantages about the traditional producing process of LD type electric single-girder crane girder, put forward the improvement of cold roll forming process. The process has no welding seam, and allows a girder manufacture to achieve higher quality and efficiency, and has low consumption, low pollution.
Numerical Control Remanufacturing for Relief Grinding Machine
Authors: Gao Hong Hong , Lao Qi Cheng
Published: November 2012

The remanufacturing for the traditional idle relief grinding machine is introduced in this paper to overcome its shortcomings, such as low precision, low automation degree and poor flexibility. The drive system of the traditional relief grinding machine was renovated with ball-screws and servo-drive system Sinamics S120, the original control system was replaced by numerical control system Sinumerik 828D. After remanufacturing, the mechanical structure of the traditional relief grinding machine is simplified and the machining accuracy meets the requirements. The automation degree and the flexibility of the machine are enhanced, and the labor intensity of the workers is reduced.
The On-Board Measurement of Diesel Vehicle Smoke Intensity System
Authors: Chen Hong Yan , Song Yi Jin
Published: November 2012

To real-time monitor vehicle exhaust emission under daily running, this paper proposed a on-board measurement of diesel vehicle smoke intensity system based on GSM/GPRS and GPS, and concentrated on the design of hardware and software of the vehicle mounted terminal. This paper broke the traditional fixed-point way to sample exhaust data and could acquire data of different section, different vehicle types and different time.
Structure of Parametric Designing Simulation Platform of Automotive Air Conditioning Condenser
Authors: Ni Yi Hua , Guo Hai , Wu Jian , Yang Jiang Xin
Published: November 2012

The physical and mathematical model of parallel flow automotive air condition condenser was built based on the analysis of its structure and operating characteristics; then the mathematical model was verified and optimized through finite element analysis and running experiments. The VB programming system was used to do Solidworks pro-development and condenser parameterization design module was built. Finally a condenser design and study platform facing to the heat transfer performance and structure with infinite element simulation and numerical simulation was realized.
Application Design of Mining Air Compressor’s Computer Monitoring System
Authors: Yue Bao Xing , Chen Shuang
Published: November 2012

Its powerful features can Monitor and manage the mine air so that we can improve the safe and economic operation of the equipment by the Use of industrial computers, intelligence data collection and configuration software and other new technologies