bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Characteristic of Aqueous Polymer Isocyanate Curing Reaction
Authors: Zhang Yan Hua , Gu Ji You , Tan Hai Yan , Zhu Li Bin , Shen Jun
Published: June 2010

In this study the effect of isocyanate at room temperature on the curing behavior of PVAc was investigated. Crosslinking reactions are one of the most commonly used techniques to improve physical properties of PVAc. Commonly used crosslinkers for these reactions have high reaction activity such as isocyanate. Quantitative analysis of isocyanate with PVAc will be described in this report. A XPS technique has been established to analyze structure of crosslinking in PVAc. And physical property analysis will also be described.
A Hybrid Swarm Optimization Algorithm for Complex Assignment Problem
Authors: Liu Zong Li , Cao Jie , Yuan Zhan Ting
Published: June 2010

The optimization of complex systems, such as production scheduling systems and control systems, often encounters some difficulties, such as large-scale, hard to model, time consuming to evaluate, NP-hard, multi-modal, uncertain and multi-objective, etc. It is always a hot research topic in academic and engineering fields to propose advanced theory and effective algorithms. As a novel evolutionary computing technique, particle swarm optimization (PSO) is characterized by not being limited by the representation of the optimization problems, and by global optimization ability, which has gained wide attentation and research from both academic and industry fields. The task assignment problem in the enterprise with directed graph model is presented. Task assignment problem with buffer zone is solved via a hybrid PSO algorithm. Simulation result shows that the model and the algorithm are effective to the problem.
Finite Element Analysis of Behavior of Bolted Flange Connections under Bending Loading
Authors: Wu Bin , Wang Tao , Xu Chao , Xu Bing
Published: June 2010

Only a limited number of experimental and analysis reports exist concerning bolted flange connections under bending loading. In order to investigate the complex nonlinear phenomena, three dimensional elasto-plastic finite element analyses are performed. In those analyses, frictional contact model with small sliding option is applied between contacting pair surfaces of all connecting elements. Bolt pretension force is introduced in the initial step of analysis. From this study, the following results are obtainted:1) proposed finite element analysis method can be applicable to estimate complex nonlinear behavior of bolted flange type connections; 2) There is a sharp change in bending stiffness during loading, and lateral slip between two jointed flanges cause the bolt to carry shear load. The design of bolted joints should consider the interaction among cylinders, flanges and bolts.
New Policy of Maximal Frequent Itemsets in Data Stream Mining
Authors: Xu Chong Huan , Ju Chun Hua
Published: June 2010

According to the features of data streams and combined sliding window, a new algorithm A-MFI which is based on self-adjusting and orderly-compound policy for mining maximal frequent itemsets in data stream is proposed. This algorithm which is based on basic window updates information from data stream flow fragments and scans the stream only once to gain and store it in frequent itemsets list when the data stream flows. The core idea of this algorithm: construct self-adjusting and orderly-compound FP-tree, use mixed subset pruning techniques to reduce the search space, merge nodes which has equal minsup in the same branch and compress to generate the orderly-compound FP-tree to avoid superset checking when mining maximal frequent itemsets. The experimental results show that the algorithm has higher efficiency in time and space, and also has good scalability.
Decision Process Knowledge Acquisition through Integration of Rough Set and Ontology Technology
Authors: Liu Xin Hua , Liu Xu Mei , Hou You Fu
Published: June 2010

In order to realize the sharing and reuse of process knowledge, an intelligent approach for process knowledge acquisition based on rough set theory and ontology technology was proposed. The framework of process knowledge acquisition was put forward and process knowledge acquisition system was defined. An information complementation method was presented and the algorithm for automating process knowledge acquisition was designed. Moreover, ontology technology was applied in process knowledge representation to resolve the problem of process knowledge reliability and consistency, and the similarity computing approach of knowledge ontology was presented.
Research and Application on 6D Integrated System in Metro Construction Based on BIM
Authors: Zhou Ying , Ding Lie Yun , Luo Han Bin , Chen Li Juan
Published: June 2010

With the increasing demand of building metro construction, couple with its complexity, there is a great need on an integrated system to provide all the stakeholders a convenience way to exchange information effectively and efficiently. An integrated system based on 6D is proposed by this article. The core technology of the system including BIM theory and methods of associating 3D graphics models with progress, investment and safety information are discussed. By using the integrated system, it helps the project decision makers in planning, coordination and control of management to improve project management efficiency. Also, a case study is provided which is used in Wuhan metro construction and achieves good results.
Research on a Rapid Self-Localization Method for Robot Based on Information Fusion
Authors: Yang Bo , Zhang Guo Liang , Jing Bin
Published: June 2010

This article proposed a rapid mobile robot self-localization method based on laser data, encoder data and azimuth compass data. This method can avoid tremendous error from pure mileage integral, and tremendous compute task from pure laser data registration after extract laser character. It only based on the similarity of adjacent laser data after pretreatment, then syncretized the estimated rotation angel and parallel displacement from encoder and azimuth compass, find the best transform with quasi Newton method. At last the mobile robot self-localization was realized. Experiment result demonstrated the reliability of this method.
Modification of PP and Its Application
Authors: Li Yan Cang , Suo Juan Juan , Zhou Shu Jing
Published: June 2010

In order to find a more effective method of solving the problem of subjectivity and difficulty to deal with the high-dimension data, an improved Projection Pursuit (PP) based on Particle Swarm Optimization (PSO) was introduced. The PSO algorithm was employed to optimize the function of the projected indexes in the PP. Application results show the efficiency of the modification. This study has significance in theory and practice for the related research.
Simplification Model for Prediction of Pressure Drop in Wire Mesh Mist Eliminator by CFD
Authors: Luan Yi Gang , Sun Hai Ou
Published: June 2010

In this article, computational fluid dynamics(CFD) method is used to predict the pressure drop of a wire mesh mist eliminator. A simplification method is used during the simulation process to solve the difficulty of model building during the simulation of the mist pad. A two-dimensional model is employed to acquire the resistance of mesh pad with different layer spacing. The flow field is calculated using 2D Reynolds-averaged Navier-Stokes equations. turbulence model is used to simulate the Reynold stress. And pressure drop of wire mesh mist eliminator is expressed as a function of broad ranges of inlet velocity. After CFD simulation, model experiment study is carried on using a small scale wind-tunnel. The pressure drop is gained to testify the numerical simulation result.
Research of Reinforce Plan for No. Zero Frame of TB200 Aircraft and Secondary Damage Prediction
Authors: Liu Feng , Zhang Zhong Bo , Qin Wen Feng
Published: June 2010

The original structure stress state of No. zero frame of TB200 aircraft is analyzed by finite element method. The stress and the reasons of the crack on the frame are determined. The numerical analysis results fit well with the actual damage of the frame, and the finite element analysis model is verified to be reliable. The stress state of the damaged frame structure is analyzed, which shows that the undamaged frame structure must be reinforced. The reinforce plan for the undamaged frame structure is given. The reinforced frame structure is analyzed by finite element method. The stress state and the residual strength of the reinforced frame structure are given. It is showed that the reinforce plan causes an obvious descent of the frame stress. The load is mainly distributed on the reinforcement of the No. zero frame. The residual static strength of the reinforced structure is higher than the original structure. The possible secondary damage position and mode of the reinforced structure are predicted.
Coefficient of Friction for Aluminum Alloy Sheet in Contact with Polyurethane Rubber
Authors: Wang Li Li , Li Dong Sheng , Li Xiao Qiang , Wang Liang , Yang Wei Jun
Published: June 2010

Stretch forming process of aircraft skin over reconfigurable compliant tooling is a new technology in skin manufacturing. During this process, the coefficient of friction is important for modeling accurately the process of stretch forming. The objective of this research is to measure the coefficient of friction for aluminum alloy in contact with polyurethane rubber in reciprocal sliding. An orthogonal experimental design was used to reveal the impact of four factors on the coefficient of friction, including lubrication, normal load, aluminum alloy material and sliding velocity. It is shown that lubrication is a major factor, sliding velocity is a minor factor. The influence of normal pressure is less than sliding velocity and the influence of aluminum alloy material is not very obvious. Finally, based on the experiment results, the selections of lubricant and stretching velocity are discussed in order to improve the process of stretch forming.
Application of Supporting Vector Regression Model on Simultaneous Determination of Benzoic Acid and Salicylic Acid
Authors: Liu Jie Fang
Published: June 2010

Support vector machine (SVM) is based on the principle of structural risk minimization, which makes SVM has better generalization ability than other traditional learning machines that are based on the learning principle of empirical risk minimization.Research on the application of Support vector regression （SVR） model in spectrophotometry was done to determine the content of benzoic acid and salicylic acid simultaneously. The predicted result was found highly correlated with the time when the data was collected to build the model. The closer of the dates between collecting data for modeling and for predicting, the better the predicted results. SVR model with significantly improved robustness was resulted by using all the collected data over time, which, when applied to the determination of benzoic acid and salicylic acid simultaneously, led to satisfactory result, with recoveries being 97%-102%.
Investigations on Incremental Forming of Low Carbon Steel Sheets
Authors: Chezhian Babu S. , Kumar V.S. Senthil
Published: June 2010

Low carbon steel sheets are used invariably in automobile body panels and construction structural applications. Conventional forming techniques require forming dies and heavy duty presses to make required shapes, which are costly in manufacturing. Incremental forming is a recently developing die less sheet metal part production technique in which the necessary part is obtained by gradually tracing its contours on a sheet of required thickness using stepwise tool indents. In this investigation, Low carbon steel sheets of different thicknesses were incrementally formed using a hemispherical tool under varying step depths. The final thickness of the sheet, forming angle, roughness and microhardness of the formed shapes were characterized. The microstructure of the formed materials was studied using optical microscope.
A Study on Radial Curtain Plybamboo Form
Authors: Du Chun Gui , Jin Chun De
Published: June 2010

Plybamboo is commonly made using chordwise bamboo strips. Previous studies have indicated that the bamboo utilization rate and the processing efficiency are low in manufacturing chordwise curtain Plybamboo. This paper presents a study on the manufacturing technology of radial curtain plybamboo form. Radial strips cut from bamboo were glued on the radial faces. The results showed: (1) the bamboo utilization rate of radial cutting strips was 15-20% higher than chordwise cutting strips, and the resin consumption was only approximately 50% of chordwise bamboo strips; (2) however, radial bamboo strips were more subject to lengthwise bending deformation than chordwise strips during drying. This lengthwise bending deformation can be effectively reduced or prevented by placing a hollow rigidity axle in the radial bamboo curtain rolls when using the bound drying method; (3) the hot pressing time of the radial curtain plybamboo form was approximately 50% of the chordwise composite plastic curtain plybamboo.
Study of Modification Coefficient for Less-Teeth Gear Transmission
Authors: Zhang Guo Hai , Li Peng , Zou Ying Kang , Wang Bao Ming
Published: June 2010

Because of the lack of research, there is no mature design method for less-teeth gear transmission nowadays. In this paper, based on the features of less-teeth gear transmission, we presented the five main limitations of the modification coefficient for less-teeth gear and its relevant equations. By using these equations, taking z1=4, z2=54 as an example, we plot the closed graph for the modification coefficient on computer, and then analyzed it. By using this method, we can plot the closed graph of modification coefficient for any transmission ratios. Determining the modification coefficient according to its closed graph is not only quite easy to understand, but also more reasonable.
Research on Dynamic Behaviors for a Parallel Machine Tool Considering Elastic Component
Authors: Chen Xiu Long , Jia Shuai Shuai , Deng Yu , Zhao Yong Sheng
Published: June 2010

In order to obtain dynamic behaviors of a spatial rigid-flexible coupling system of PMT(parallel machine tool) without the construction of mathematical model, a new method for dynamic behaviors simulation, which integrates CAD, CAE and visual technologies, was presented. The solid model of PMT was built in SolidWorks and transmitted to ADAMS, the modal neutral file of flexible body including driving limbs and spherical joints were generated in ANSYS, and introduced into ADAMS, then the rigid-flexible coupling model of PMT was build. Based on the rigid-flexible coupling model, the dynamic behaviors, which includes displacements error output response, dynamic stress of driving limbs and natural frequency, were realized. The simulation results show that the rigid-flexible coupling model established can indicate the dynamic behaviors of PMT. The flexibility of driving limbs and spherical joints are demonstrated to have significant impact on dynamics characteristics of PMT. This research can provide the important theoretical base of the optimization design of dynamic parameters for PMT.
The Research and Actualize of the Quality Management System’s Effectiveness Evaluation
Authors: Feng Shi Lin
Published: June 2010

To guarantee the run effectiveness of the quality management system(QMS), a comprehensive evaluation system of the QMS’s effectiveness is brought forward. In the evaluation system, first the evaluation flow chart is set up; Second the evaluation index is given out; Third the evaluation result is given out by the calculate of the grey integration evaluation arithmetic. The organization can find out why the effectiveness of the QMS is weak and establish improvement measure from the comprehensive evaluation result.
Photoelectrochemical Degradation of Procion Red MX-5B in TiO2 Suspension Using Na2SO4 as Electrolyte
Authors: Zhang Wen Jie , Li Ru Yuan , Bai Jia Wei
Published: June 2010

Photoelectrochemical (PEC) degradation of Procion Red MX-5B was investigated in aqueous Na2SO4 solution. Higher electrolyte concentration resulted in higher current between the electrodes due to increased conductivities of the solutions. UV irradiation could obviously raise the current, and the differences became larger in accordance with the increase of the applied potentials. The pH declined in the first 30 minutes and became constant for the prolonged reaction time during both PEC degradation and photocatalytic oxidation. The applied potential could only slightly improve dye decolorization. Although a potential of 8 V was applied to 0.3 mol/l Na2SO4 solution, TOC removal efficiency of PEC degradation was almost as the same as that of photocatalytic oxidation.
The Research on the Application of High-Speed Washer in Waste Paper Deinking System
Authors: Zhao Li , Yin Jing Bo , Li Tai , Qian Yu Xia , Dong Ke
Published: June 2010

Through the comparative study of several enrichment machines ,the performance of the high-speed washer is introduced. The high-speed washer has high dewatering and washing efficiency, he pulp can be concentrated from 0.8% ~ 1.5% consistency to 10% ~ 15%;And it has high ash removal rate and good pulp washing effect also. It can effectively remove the ink particles, fillers, and other small impurities, improve the pulp brightness. At the same time ,the waste paper deinking process treatment systems has been developed.
Customer Oriented Product Design by Adaptive Clustering Analysis
Authors: Dai Wei Hui
Published: June 2010

In the face of increasing competition and diversified demand, product design must be customer oriented for modern enterprises to satisfy the variationally personalized requirements. Thereof; the exact orientation and comprehensive analysis of target customers have been the key to conduct customer oriented product design. This paper presented a new method for the orientation and analysis of target customers by adaptive clustering analysis. By this method, the distribution of customer clusters and the related characteristics of each custer as well as its included customers can be extracted dynamically and adaptively. Applied by this method, the adaptive recommendation system was illustrated for the design of LCD-TV.This paper applied the Autonomous Intelligent System(AIS) to deal with the intelligent activities intelligently and automatically, and thereof provided a new method for the Supply Chain Management(SCM) on MC manufacture. First, a new supply chain model based on E-HUB was presented according to the requirements of MC manufacture, and then the structure and operation of AIS were designed to support that SCM. Finally, the development technology of AIS was discussed.
An Adjustable Adaptive Subdivision Surface Modeling Based on Triangle Meshes
Authors: Zhao Fu Qing , Ai Xin
Published: June 2010

Subdivision surfaces have become a standard technique for free shape modeling. But tradition subdivision scheme does not adjust the shape of subdivision results. In this paper, We introd uce adjustable adaptive subdivision as a new adaptive subdivision method for triangle meshes. This method applied to the method of adaptive subdivision constructs a new subdivision rule by introducing adjustable parameter to the traditional Loop scheme. The experiment shows that this method not only use fewer meshes to obtain the performance good surface but also can adjust the hape of subdivision surface to satisfy the actual need.
Research on the Model of Grid Marketing Management
Authors: Cheng Yan Xia , Li Na
Published: June 2010

The paper, referencing the idea of collaboration and share of Grid and Grid Management, aiming at the limitations of the traditional model of marketing, put forward the concept of Grid Marketing. Based on the analysis of characteristics of Grid Marketing, this article studies the design principles of the model of Grid Marketing Management, constructs the model of Grid Marketing Management, and designs the operation process of the management model.
Study on Cutting Parameters Optimization Based on Uniform Design Method
Authors: Li Deng Wan , Chen Hong Tao , Xu Ming Heng , Zhong Cheng Ming
Published: June 2010

In order to explore the cutting rules and optimize the cutting parameters of titanium alloy, multiple sets of test parameters were schemed out by using the uniform design method. Test cutting researches with these parameters were conducted under the condition of 12°C dry cutting and -50°C cold blast machining respectively. Through the regression analysis about the results of the test, a multiple linear regression model which is applicable for titanium alloy cutting on its surface roughness and cutting force has been established. The variance analysis shows that it is of remarkable linear relationship. On this basis, a multi-objective optimization model of titanium alloy has been set up. And by means of multi-objective data weighted method, successfully convert the multi-objective optimization model into a single-objective one. Verification tests were done under these cutting parameters, and the results are in good agreement with the calculated.
An Optimization Algorithm for a Class of Mathematical Model in Mechanical Engineering
Authors: Yin Jing Ben , Yan Jie Sheng , Zhao Ying Feng , Jiao Hong Wei
Published: June 2010

In this paper, we develop an algorithm to globally solve a class of mathematical models in system engineering. Firstly, by utilizing equivalent problem and linear relaxation method, a linear relaxation programming of original problem is established. Secondly, by using branch and bound technique, a determined branch and bound algorithm is proposed for globally solving original problem. Finally, the convergence of the proposed algorithm is given and numerical examples showed that the presented algorithm is feasible.
The Modeling and Integrating Issues of EII- Oriented QMS in Manufacturing Enterprises
Authors: Yang Hong Yu , Yang Tong Ji , Wen Ting Xin
Published: June 2010

According to the existing problems and shortcomings of the manufacturing enterprise quality management, integrating with enterprises’ new needs of quality management in the recent implementation of QHSE( Quality, Health, Safety, and Environment) system, this paper built an EII( Enterprise Information Integration)- Oriented QMS( Quality Management System) model, discussed the integrating problems involved in the system, then proposed the overall EII model. By analyzing the information integration relations between QMS and other enterprise applications, this paper put forward some practical ideas and principles of system integration, then built the framework of EII- Oriented QMS solutions. The aim of this paper is making full use of quality information, improving the quality of management and control, and helping manufacturing enterprises to better understand what EII- Oriented QMS is and how to make it a successful project.
Slagging Process Simulation Based on Improved BP Neural Network
Authors: Li Xiao Feng , Liu Zong Xin , Zhou Ruo Yu
Published: June 2010

The slagging process in high temperature furnace smelting technology was simulated by improved BP neural network. According to the actual production condition, the improved algorithm was applied to determine the optimized neural network structure as 3-5-1 network in slag density prediction. It shows that the slagging process by means of improved BP neural network is feasible. By the simulation of BP neural network, the slag density can be predicted to adjust the proper slag composition, which can be produce high-quality metal products.
A Bran-New Cross-Domain Authentication Model Based on Lattice
Authors: Miao Feng Man , Zhang Qiu Yu , Yuan Zhan Ting
Published: June 2010

A bran-new lattice based cross-domain model is proposed to solve the shortcomings of the existing authentication model. Firstly, using the lattice theory, this model builds credit-domain alliance and user alliance on the two dimensional coordinates to avoid the abuse of centralized plans. Secondly, it uses the superiority thought of the existing authentication system to strengthen the integrity of the model. Finally, the detailed work flow, formula, domain disposal, extended algorithm, and identity-based Stealth transport protocols of the new model are drafted. It ensures the user’s identity information and privacy. After the certification and analysis, this model proved to have a good Practical character and an extremely large extension space.
Object-Oriented Modeling and Simulation of Railway Vehicle Systems
Authors: He Yong , Ding Guo Fu , Zou Yi Sheng , Jia Mei Wei , Xu Ming Heng
Published: June 2010

An object-oriented modeling method was proposed to develop a simulation software package named GVDS which could be used to predict some aspects of dynamic behavior of railway vehicle. The package based on multi-body dynamics mainly consists of three parts, an interactive pre-processor, the solver and an interactive post-processor. With UML, demands and structure of the software package are represented. By modeling of the geometry and behavior of each object, virtual prototype of railway vehicle is formed and by the simulation, the critical speed of hunting stability, wheel-rail contact forces and so on can be determined and the hunting stability, curving behavior and ride comfort can be analyzed and evaluated. Finally, some cases are simulated. The simulation results show the effectiveness of the proposed method.
Stiffness of Wood-FRP Bonding Interface with Ambient Curable Epoxy Adhesives
Authors: Cheng Fang Chao , Hu Ying Cheng
Published: June 2010

Effects of glue spread, adhesive kind and curing agent ratio and FRP (Fiber Reinforced Plastic) on stiffness of wood-FRP bonding interface were investigated. Two different kinds of epoxy resin and one kind of curing agent were used to bond wood-wood and wood-FRP samples with three different glue spread. Shear modulus of samples were measured by compression shear test to represent the stiffness of bonding interface. The results indicated that curing agent ratio and glue spread had significant effect on stiffness of wood-wood and wood-FRP bonding interfaces. In addition, the stiffness of wood-FRP interface was less than that of wood-wood interface.
Multiple Objective Robust Optimization Design of the Web Press’s Fold Mechanism
Authors: Yuan Ying Cai , Liu Yi Lun , Li Yan
Published: June 2010

In most practical engineering optimal problems, the sensitivities of quality characteristics is affected by the deviation of design variables, and the evaluation of quality is multi-aspect. In web press’s fold mechanism design, the trace deviation and entrance angle in working state are important criterions which affect the folding knife’s kinematic performance. In order to improve the synthetic kinematics performance, a multiple objective robust optimum design model could be established, based on the analysis of sensitive response to the design variables and determining proper evaluation strategies. By comparing the results of multiple objective robust optimum design and common optimum design, we can find that the synthetic kinematics performance of multiple objective robust optimum design is much better.
Trajectory Control in Automated Welding of Tubular Joints
Authors: Tian Xin Cheng , Lü Yan
Published: June 2010

A saddle curve is formed by intersection of two tubes. The trajectory control of saddle curve is usually carried out through approximating the curve as segments of straight line/circular arc for CNC interpolation. Based on the principle of space analytic geometry, this paper proposes a new trajectory control approach to directly interpolate the saddle curve for automated welding/cutting system. Simulation of the direct interpolation algorithm of saddle curve has been carried out to verify the effectiveness of the proposed algorithm. It also demonstrates that the interpolation error is well within the accuracy requirements and the proposed algorithm is potentially useful for the cutting/welding of saddle curve of tubular joints.
Study on Rolling Contact Behaviors of Three Kinds of Railway Wheel Treads
Authors: Wang Wen Jian , Zeng Qing Fei , Guo Jun , Liu Qi Yue
Published: June 2010

The rolling contact behaviors between LMA, S1002 and XP55 wheelset and track in static rolling contact are analyzed using the rolling contact theory of three-dimensional elastic bodies with non-Hertz form and numerical program of CONTACT. The numerical results indicate that three kinds of wheel treads have different difference of rolling radius and equivalent taper. The rolling contact behaviors between three kinds of wheel treads and CHN60 rail have obvious difference. The comprehensive analysis indicates that the matching effect of LAM wheel tread and CHN60 rail is relatively superior. Furthermore, it is suggested that new wheel tread should be designed and optimized for the high-speed railway.
Reliability Analysis of Interval Parameters Bar Structures with Affine Arithmetic
Authors: Liu G.L. , Chen J.J. , Zhu Zeng Qing
Published: June 2010

By representing the uncertain parameters as interval numbers, the reliability index equations of bars structures were obtained. A modified matrix affine arithmetic polynomial evaluation method plus recursive derivative information was proposed in this paper, which keeps all powers of noise symbols without approximation. Based on the nature that affine forms and intervals variables could transform each other, affine forms of bounded uncertain variables and modified affine arithmetic including derivative information for interval univariate polynomial evaluation were introduced into modeling and calculating non-probabilistic reliability index. An extended beam example and a ten-bar truss structure example were provided to illustrate the validity and feasibility of the presented procedures.
Experimental Study of the Electrical Potential Technique for Crack Monitoring of LY12-CZ Plate Specimen
Authors: Cui Rong Hong , He Yu Ting , Yu Zhi Ming , Du Jin Qiang
Published: June 2010

The electrical potential technique was applied to monitor the crack initiation and propagation in LY12-CZ plates. The feasibility of this method was validated by a simulation experiment firstly. Then fatigue crack monitoring experiment based on LY12-CZ aluminum alloy center-hole plate specimen was carried out. After a special coating sensor was prepared on the monitoring area of the specimen by surface technology, a set of fatigue crack monitoring experiments were carried out. The changes in the potential values of the coating sensor resulting from crack damage were documented. Since the property of the coating sensor and the introduced current were constant, the measured voltage values would only relate to the crack’s length and position. Based on the experimental results, the relation curves between voltage values and crack lengths were obtained, and a set of empirical formulae were deduced.
Discussion of Reliability Analysis for Aircraft Wing Box Structural System
Authors: Zhao Wei Tao , Zhang Da Qian
Published: June 2010

It is very complex problem that the reliability of aircraft wing box structural system with many random variables (such as area, thickness, material modulus, load etc.) is analyzed. In the paper, the reliability analysis method of aircraft wing box structural system is proposed based on the theory of structural reliability and stochastic finite element. The explicit expression of safe margin and the sensitivity of safe margin to each random variable are given, which improves the accuracy and efficiency of reliability calculation. The relationship of the level of failure path with structural system failure probability is discussion. The failure probability of element is calculated by using first order second moment method, and the main failure path of structural system is identified by using the advanced branch and bound method, and the failure probability of structural system is evaluated by using probabilistic network evaluation technique method. Numerical examples show that the method is of efficient and accurate, and the 3 or 4 level of failure path is acceptable for wing box structural system considering efficiency and accuracy.
The Mechanism Design of the Upper Air Crawling Robot
Authors: Liu Gui Zhen , Chen Ya Zhe , Liu Yang , Wen Bang Chun
Published: June 2010

The thesis designed a robot which can crawl along the mast or the rope, introduced this robot’s composition and his function, and carried on the kinematics modeling, analysis and simulation design to the robot. The crawling robot can carry the detector set to inspect the mast or the rope.
Contacting Model Considerations of Interference Fit for Shaft-Hub System
Authors: Luo Hong Yun , Liu Chun Jiang , Li Kai
Published: June 2010

In this study, a contacting model was investigated for interference ﬁt shaft–hub system (rotor system) on rotational speed 30000 r/min by finite element method (FEM) which gives more complete and accurate results than the traditional method. 2-d and 3-d FEM contacting models were established first; then the stress distribution and contact state of rotor system which containing four interference ﬁt couples were analyzed with the contacting FEM model system while the rotor system rotates on 30,000r/min. Finally, an optimal design of shrink range of the rotor system above was debated.
Research of Modern Railway Vehicle Structure Fatigue Design Method Based on Multibody Dynamic Simulation
Authors: Miao Bing Rong , Zhang Wei Hua , Zhang L.M. , Zhu Tao , Yin H.T.
Published: June 2010

For high-speed railway carbody structure durability analysis problems in China, one integrated method based on MBS (multibody simulation) is proposed here. Firstly, one EMU (Electricity Multiple Unit) full vehicle was performed to dynamic modeling and simulation. The numerical simulation results were applied to illustrate the vehicle dynamic characteristics. And the relationships between structural strength, stiffness, and frequency characteristics were also studied. Secondly, the multidisciplinary design technique was used to solve multi-mode coupled vibration of carbody structure on the cumulative effects of local vibration and damage effects, as well as structure light-weighting and other parallel optimization problems. Finally, the effective measures were proposed to control carbody structure’s physical failure.
Dynamic Model of Common Cause Failure Based on Shocks
Authors: Li Cui Ling , Jia Dan Dan , Sun Zhi Li
Published: June 2010

Most current common cause failure models are static models in which failure rate is assumed constant. The assumption is unrealistic in numerous situations, especially for mechanical systems. Based on the idea of shock models, this paper modifies unreasonable assumptions in conventional models and describes common cause failure process with non-homogeneous Poisson process, power-exponential process. A dynamic model is obtained. The parameters are estimated with neural network. The model presented in this paper, which is based on time-related power-exponential failure rate like bathtub curve, has more advantages and wider application than the model based on constant failure rate. Examples are given to illustrate its feasibility and precision of computation.
Reliability Analysis of Structure with Local Sunken Plate
Authors: An Wei Guang , Liu Ming , Zhao Wei Tao
Published: June 2010

The influence of the local sunken plate on ultimate strength is analyzed, and reliability calculation and sensitivity analysis expressions of the plate element are also given in this paper. Finally, taking a numerical example, the influence of each sunken factor on plate ultimate strength reliability is analyzed. The result indicates that the influence of sunken diameter and sunken depth on reliability is larger. The method that is given in this paper, it is a reference for reasonable maintenance of structure.
Development and Application of Vehicle Health Index
Authors: Jiang R. , Shi Guang Cai
Published: June 2010

Evaluating the health level of vehicles usually involves several factors and often needs to introduce subjective information. This paper presents an approach to combine several performance measures into a composite index for health evaluation. A mathematical method is proposed to estimate the overall performances of vehicles based on the observed performances under multiple measures or criteria. The approach is illustrated using a real-world example.
Residual Strength Degradation Model for Low-Alloy Steel in High Cycle Fatigue Load
Authors: Wang Na , Xie Li Yang , Song Wan Li , Cho Chong Du
Published: June 2010

Residual strength degradation of 35CrMo alloy steel is investigated experimentally and theoretically in this paper. The experimental results were obtained by high-frequency fatigue testing machine and electro-hydraulic servo testing machine at room temperature. The experimental results showed the true tensile strength under static load and the residual strength under different cycle ratio, respectively. An exponential degradation model was proposed relating the initial strength, residual strength to the applied fatigue cycles and the constant amplitude stress. The residual strength distribution was described using three-parameter Weibull probability density function. The mathematical software MatLab was used for parameter estimation. Finally, the distribution function and failure probability density function of the residual strength was received, which was significant in fatigue reliability.
Anti-Seismic Reliability Analysis of Quayside Container Crane
Authors: Jin Yu Long , Wu Tian Xing , Li Zeng Guang
Published: June 2010

Towards the safety reliability problems of the quayside container crane under earthquake excitations, the anti-seismic reliability analysis has been carried out. Because of hugeness and complexity of the structure, it is absolutely impossible to carry on seismic testing with prototype. Thus, a FEM mechanical model of quayside container crane is presented by using the ANSYS codes. Based on the modal response spectrum method and the time-history analysis theory, the load-carrying performance is investigated under earthquake excitations. The results show that neither the displacement response nor the stress response is large under the earthquake excitation in every direction, which could satisfy seismic design requirements.
Research on Mechanical Reliability Growth Model for Complete Failure Data
Authors: Sun Zhi Li , Guo Yu , Ji Shi
Published: June 2010

As everyone knows, reliability growth technology is an essential part in the mechanical reliability theory as well as an insurance of the products capability in usage. It exists throughout the entire lifespan of development, manufacturing and application. Concerning the reliability characters of mechanical products, that product life obeys Weibull distribution, which is mostly resulted from the test on the small sample, three parameters of life distribution are estimated by the grey estimation in this paper. Then according to the data acquired in the test, Duane growth model is surely developed to assess the situation of reliability growth. Furthermore, the following example ascertains that the developed model is in accordance with mechanical characters. From the result, Duane model is reasonable to evaluate the reliability growth level of mechanical products. It is obvious that the improved measure is effective to enhance the reliability and the value of MTBF can be calculated with the model.
Study on the Control System of an Automatic Testing Equipment for Diffusion Vacuum Pumps by Fault Tree Analysis
Authors: Zhang Shi Wei , Liang Wen Sheng , Zhang Zhi Jun
Published: June 2010

In order to promote the performance measurement technique of the diffusion vacuum pumps, one full-automatic test equipment was newly developed and patented. The control system is the core of the test equipment and its reliability analysis is necessary. The structure and the characteristics of the test equipment are introduced in paper. The fault tree of the test equipment is set up and illustrated in detail. Based on fault tree analysis, the reliability designs of the hardware and software of the test equipment are carried out.
Bending Ratcheting Tests of Z2CND18.12 Stainless Steel
Authors: Zhu Jian Bei , Chen Xu , Xue Fei , Yu Wei Wei
Published: June 2010

A series of ratcheting experiments under bending loading for Z2CND18.12 stainless steel were carried out on a dynamic mechanical analyzer. The characteristic of progressive inelastic deformation of the material in the different temperatures and different bending loadings were investigated. The difference of the domestic and imported stainless steel on the bending ratcheting properties was studied. It is shown that the temperature and the bending loading affect the ratcheting greatly. In addition, the imported steel is better than the domestic one on the resistance to the ratcheting deformation at various temperatures and bending loadings.
On the Design Approach of Double-Tubesheets
Authors: Yu Hong Jie , Qian Cai Fu , Cao Ri
Published: June 2010

Double-tubesheets are used in heat exchangers where strict tightness is required. In this paper, finite element analysis models were established to simulate the double-tubesheets. Stresses and deformations in the tubesheets induced by pressure load were calculated and formulated. Results showed that the tube supports to the tubesheet are much stronger than considered in the commonly used heat exchanger design codes. If the design is based on accurate stress analysis using finite element method, the tubesheet thickness of heat exchangers could be significantly reduced. The two tubesheets strengthen each other especially when their spacing is short.
Function-Oriented Design and Verification of Point-Contact Tooth Surfaces of Spiral Bevel and Hypoid Gears with the Generated Gear
Authors: Wu Xun Cheng , Li Cong
Published: June 2010

Establishing a general technical platform for the function-oriented design of point-contact tooth surfaces of spiral bevel and hypoid gears is an important and fundamental work. Based on the three-axis CNC bevel gear machine, a general mathematical model for the generated gear tooth surfaces of spiral bevel and hypoid gears is established. According to the principle and the method for the function-oriented design of point-contact tooth surfaces, the locus of spatial tooth contact points on the tooth surface is described on the axial plane of the gear, and then the formulae for the design with the generated gear are derived from the mathematical model. The mathematical model and the formulae can be used in the function-oriented design of point-contact tooth surfaces with the gear generated in different types on both the three-axis CNC bevel gear machine and the conventional cradle one. A theoretical method for the verification of point-contact tooth surfaces is proposed and the formulae for the verification are presented. And lastly an example is given to demonstrate the function-oriented design of point-contact tooth surfaces of the hypoid gear drive with the generated gear.
Support Activity Flow Based Forecast Model for the Quantity of the Aircraft’s Support Equipments during Design and Development Phase
Authors: Wen Jia , Kang Rui , Jia Zhi Yu , Wang Nai Chao
Published: June 2010

In order to resolve the problems encountered in the process of forecasting the quantity of equipments demanded by aircraft’s support system during the design and development phase, including the difficulty to collect the input data of the existing forecast models and their imprecise and unauthentic output results, a model of was established to forecast the number of support equipments based on support activity flow described by functional flow diagrams. Firstly, the aircraft’s typical mission was analyzed and the quantity of operation and maintenance support activities happened in the duration of the mission was calculated on the basis of the typical mission’s data and aircraft’s reliability data. Secondly, the working hours and maximum number of the support equipments demanded by the support activities in the bottom of the functional flow diagrams was calculated and analyzed. Thirdly, an approach to sum the working hours and maximum quantity of the support equipments demanded by the support activities with logic relations in the same level of the functional flow diagrams was presented and with which the working hours and maximum number of support equipments demanded by the top-level support activity was achieved. Fourthly, the quantity of support equipments to be allocated in the support sites was calculated. At last, the proposed model was demonstrated via a practical case of aircraft, which proved that the model is corrective and effective.
Development of a Surface Defect Inspection System for Cold Rolled Strip Based on Bright-Dark Filed Mode
Authors: Wei Yu Lan , Yan Yun Hui , Li Bing , Cong Jia Hui
Published: June 2010

Base on the study of the light reflectivity of steel surfaces, the interaction of CCD Camera and Illumination is investigated through experience. A new bright-dark filed defect recognition method which combines bright-filed mode and dark-filed mode is proposed. The bright-filed defect and dark-field defect on the surface of the strip steel can be detected at the same time through this new way, and the quantity of the defect information is increased. Therefore, the recognized defect type is twice the tradition way. A new algorithm of defect detection which is proper to bright-dark filed mode is proposed, too. This method is based on the image fusion. Experiment results show that detection rate of defects is more than 95% while classification rate of defects is over 85%.
Product Sustainability and Realization
Authors: Liu Hong Xun , Cao Guo Zhong , Tan Run Hua , Zhang Cheng Ye , Zhang Shu Min
Published: June 2010

The goal of this paper is to find out the combination point, through analyzing the characteristic of sustainability and product design process, and propose a set of design principles of sustainability which are suitable for product design process. In the process of product design, considering sustainability in parallel, designers will be able to obtain products with sustainability.
Modern Product Design Platform in Distributed Resource Environment
Authors: Dai Xu Dong , Ma Xue Fen
Published: June 2010

The resources that product design relies on are more distributed than ever along with the varying of the global design environment. More and more resources outside of enterprises are needed during the product design process. The Modern Product Design platform supporting the product design under the circumstance of distributed resources will meet the requirement of the enterprise's product design and development under such conditions, and will simplify the implementation of the IT support system for integration of design resources outside of enterprises. In this paper the characteristics and supporting technologies of product modern design platform, which supporting the distributed design resource circumstance and centering on the enterprise, are studied. The building method of the platform is presented and a prototype of the product design platform is developed. Three subsystems are included in the platform; they are product requirements analysis system, product design planning system and design knowledge management system. Many design tasks can be supported on the platform, such as product requirement analysis, concept design, detail design, and experiment. The distributing, implementing, tracking and managing of product design lifecycle tasks can also be supported on the platform. The distributed design resources could be sealed as application components to provide design services. Design work flow model and knowledge flow model are built and controlled on the design platform. The design knowledge is managed based on the Six-Dimension Knowledge Classification.