bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparison among Turbulence Models for a Novel Static Circulating Jet Mixer
Authors: Yu Yan Fang , Liu Xiao Ren , Wu Jian Hua , Meng Hui Bo
Published: June 2010

Three turbulent models, standard k- model, realizable k- model and SST k- model, are proposed to calculate the distribution of the flow field in a novel static circulating jet mixer. The results show that the SST k-model can depict truly the fluid motion in the novel jet mixer from the velocity vector distribution. The k-Standard model overestimates k in the wall and the bulk zones. Comparing the numerical models, the SST k- model gives better results than the other k-models at the same Reynold number.
Application of Current Gain Compensation Method in Quality Control of Resistance Spot Welding of Galvanized Steel Plate
Authors: Wan Bin , Hu Xin Bin , Dong Shi Jie , Liu Zhong Hou , Zhang Mao , Zhang Ning Hong
Published: June 2010

In this paper, the control method of current gain compensation for welding is adopted. Precise current gain curves (i.e., current step curves) in resistance spot welding of galvanized steel plated are discussed and drawn. By analysis of failure of electrode cap, it indicates that new current step curve ensure that qualified welding spot nugget dimension is acquired. The welding spot is high in strength, stable and reliable in quality. It is superior to original current step curve.
Embedded Software Simulation Testing Virtual Machine: Design and Application
Authors: Yin Yong Feng , Liu Bin , Li Guo Qi , Wang Zhi
Published: June 2010

Embedded software testing is a hot topic in software testing field. It is a challenge to enhance the generalization, portability, and maintainability of embedded software testing environment (ESTE). In this paper, by applying virtual machine technology into embedded software simulation testing, a custom-build embedded software simulation testing virtual machine (ESSTVM) which is composed of data type, memory management, task management, communication, testing instruction set and testing files is presented firstly. And then, ESSTVM was applied in design of avionics software testing environment (ASTE). Based on the description of architecture of ASTE, the design and implementation of the testing development system and testing execution system are put forward. Practical application of ASTE in engineering shows that the method can improve the generalization, portability, and maintainability of ESSTE effectively. Next research steps are put forward to improve the real-time capacity and efficiency of testing execution system and extend it to be distributed.
The Strategy Study of the International Fire Fighting Robot Competition
Authors: Yang Guang Ying
Published: June 2010

In a hermetic model building, when there is a signal of fire alarm, the robot will start and send out alarm constantly. It will find the fire place and extinguish the fire. Then, the robot will get back to the start point in the shortest time. In this paper, the robots and the competition strategy has been introduced. At the same time, this paper emphasizes the sensor and the editing process of the software. According to the rules of the international fire extinguishing match and the limitation of the competition area, arithmetic along the wall and the appropriate situation analysis should be used to detect the environment and drive the motor to make the robot find and put out the fire according to the proposed scheme. Experimental results show that it is practicable that robots can successfully find out the fire sources with the approach and the technology of avoiding the obstacle by infrared detection. Better performance of searching the room and extinguishing the fire quickly has been achieved.
The Evaluation Model of Unascertained Measure on Operation Quality of Transit Equipment
Authors: Pang Yan Jun , Wang Nian Peng , Liu Li Min
Published: June 2010

As one of typical multilevel fuzzy comprehensive evaluation, the key step for the evaluation of operation quality of urban taxi transportation system is to converse a series of membership degrees from membership degrees of bottom indexes. However, the existing converse algorithms of membership degrees are questionable because of redundant data of membership degrees of indexes, which are useless to objective classification, are involved in calculation of it of the objectives. Therefore, in order to classify the objects properly, a filtering algorithm, which can filter redundant data firstly in membership degrees of indexes that are useless for objective classification, is proposed to extract the valid values to converse membership degrees. Without the redundant data, a general algorithm for conversing membership degrees is given to evaluate the operation quality of urban taxi transportation system.
Influences of Welding Sequence on Residual Stress of Plate Butt Welding
Authors: Ji Peng , Dai Qing Hua , Yin Chen Bo , Yi Di Sheng , Wang Bin , Zhu Jie
Published: June 2010

For the plate butt welding of the same materials with different geometry structures, the numerical simulation was adopted to analyze the influences of welding sequence on transverse and longitudinal residual stress in the process of multi-layer and multi-pass welding. The results show that when welding from the small geometric side to the large side, the peak values of transverse and longitudinal residual stress are min along the bottom or top axis of the weld. And the welding sequences of the foremost welds have little effects on transverse and longitudinal residual stress along the bottom or top axis of the weld.
Development and Application of the Optimization Design of Progressive Die Based on Transfer Unit
Authors: Hu Dao Chun , Wang Lei
Published: June 2010

The objective of this study was to research a newly progressive die , which unifies the merit of high efficiency of the progressive dies and the high material-using ratio of the project dies. This paper analyzes the forming process methods of IHS(Intel Heat Spreader), and develop a set of progressive die with transfer unit , which turns project die to progressive die. The cooperation between the transfer unit and the die was studied, and the key technology of the newly progressive dies were investigated. Compared with the traditional die, the mechanization and electrization are realized to increase the production efficiency and get highly precise IHS. The newly designed transfer unit is expected to be a helpful reference for designers facing demands for higher quality, lower cost and shorter delivery time for some special products.
A Hybrid Approach Based on Artificial Neural Network (ANN) and Differential Evolution (DE) for Job-Shop Scheduling Problem
Authors: Zhao Fu Qing , Zou Jian Hua , Yang Ya Hong
Published: June 2010

In this paper, we proposed a new hybrid approach, combining ANN and DE(Differential Evolution), for job-shop scheduling. Job-shop scheduling can be decomposed into a constraint satisfactory part and an optimization part for a specified scheduling objective. For this, an NN and DE-based hybrid scheduling approach is proposed in this paper. First, several specific types of neuron are designed to describe these processing constraints, detecting whether constraints are satisfied and resolving the conflicts by their feedback adjustments. Constructed with these neurons, the constraint neural network (CNN) can generate a feasible solution for the JSSP. CNN here corresponds to the constraint satisfactory part. A gradient search algorithm can be applied to guide CNN operations if an optimal solution needs to be found at a fixed sequence. For sequence optimization, a DE is employed. Through many simulation experiments and practical applica¬tions, it is shown that the approach can be used to model real production scheduling problems and to efficiently find an optimal solution. The hybrid approach is an ideal combination of the constraint analysis and the optimization scheduling method.
On the Modeling of Coupled Vibration of Rotating Thin-Walled Closed-Section Composite Beams
Authors: Ren Yong Sheng , Du Xiang Hong , Yao Wen Li
Published: June 2010

The free vibration model of a rotating composite thin-walled closed-section beams is presented in this paper. The two-dimensional cross-sectional analysis based on the variational-asymptotical method(VAM) is combined with the Hamilton’s principle to derive the equations of motion and associated boundary conditions of the beams. The Galerkin method is employed in order to solve the coupled differential equations. The natural frequency results obtained for the present model are compared with those of the existing models. Numerical results are obtained for the laminated composite cantilevered box beam with Circumferentially Uniform Stiffness(CUS) configuration, the effects of the fiber orientation, pitch and precone on the natural frequencies associated with coupled vibration modes are investigated.
Research on Intelligent Fault Diagnosis Method Based on Rough Set Theory and Fuzzy Petri Nets
Authors: Li Lan Yun , Yang Zhuan Zhao , He Zhi
Published: June 2010

Rough sets theory (RST) and Fuzzy Petri nets (FPN) have been widely used in fault diagnosis. However, RST has the weakness of over-rigidity decision, and FPN has the dimensional disaster problem. In order to solve these shortcomings, according to complementary strategy, a new fault diagnosis method based on integration of RST and FPN was presented. Firstly, RST was applied to remove redundant fault features and simply fault information, so that the minimal diagnostic rules can be obtained and the fault was roughly diagnosed. Secondly, the optimal FPN structure was built and the fault diagnosis was finally realized through matrix operation of FPN. Finally, a diesel engine fault diagnosis example was analyzed, and the results show that the proposed method not only holds the ability of RST for analyzing and reducing data, but also has the advantage of FPN for parallel reasoning, so it has strong engineering practicability and validity.
Information Modeling Design in Product Development
Authors: Xu Mei Hua , Cao Dong Yuan
Published: June 2010

Information modeling design is the key of product development. An information modeling is discussed in this paper. It determines product function, form and basic structure. Major cost is spent in early product development. The model presented in this paper includes activity model for the process design. The activity model sets the context in which the objects are defined and used. The main purpose of the model development is to initiate standard interface specifications that are necessary for design and process development. The design information that is necessary for conceptual process planning has been collected and modeled using UML.
Technology for Nanodiamond Electroless Composite Plating and Properties of Coating
Authors: Huang Xiao Ting , Cai Gang Yi
Published: June 2010

The Ni-P-nanodiamond electroless composite plating adopting nanodiamond made dispersed acid liquid and the technology for Nanodiamond Electroless composite plating on steel plate was studied. The effect of plating factors on the properties of the coating was studied with orthogonal tests. The optimum formula of nanodiamond electroless composite plating was as follow: nanodiamond 3.0g/L, temperature 85°C，pH 4.5.Microstructure, corrosion resistance and wear resistance of coating were studied. The result show that The nanodiamond content of the composite coating can get weight 15.44%, and the cystiform microstructure is fine and the cohension between coating and base is good. The coefficient of friction of coating is about 0.8 time compared with that of pure Ni-P coating and its corrosion resistance was improved greatly due to the fine nanodiamond particle occupying in the little pit.
Study on the Dynamics on the Brake of Vehicle after the Effects of Deicing Salt
Authors: Peng Tao , Li Zhi Peng , Zhan Chang Shu , Luo Xiang , Wang Qian
Published: June 2010

Through analyzing the process of brake, a dynamic model of automobile and a model of the relationship between braking distance and adhesion coefficient were formed; also a simulation calculating model of braking distance was established with the use of Matlab. Finally, a research was done toward the braking distance of a type of a car running on a road after using snow-melting agent. On one hand, with the application of the simulation model which has been established, calculations have been done to the braking distance of Bora vehicles running on roads after using deicing salt; on the other hand, by experiments, Bora vehicles’ braking distance and maximum braking deceleration under the same road condition were measured, meanwhile, the established simulation model was verified.
A Dynamically Reconfigurable Workflow System Based on Web Service Technology
Authors: Liu Hong
Published: June 2010

Workflow technology is a key technology to improve business process efficiency and productivity. It can monitor, control and coordinate the business processes and programs and can track the flow of work and information as well as the utility and inputs of resource in advance. Through workflow systems have a significant impact on organizations in the past decade, how to rapidly and cost-effectively satisfy the various dynamic demands of the market adapt to an unpredictable business environment and increasing rates of new production methods are the major challenges for enterprises. A service-based dynamically reconﬁgurable system framework was proposed in the paper. In the framework, a service center represents an intelligent service broker that offers a self-managed and integrated service to respond to the requests from the workflow adaptively. A workﬂow engine in this framework coordinates these service agents to implement particular business functions. The structure of the service agent, including its plan model, the relevant reconﬁguration method and a service optimization mechanism, were discussed in the paper. A case study and an implementation were also presented.
A Novel ERP Framework Based on Service-Oriented Architecture
Authors: Wang Jing , Lv Guo Nian , Zheng Fei Fei , Lv Mei Dan
Published: June 2010

On the basis of shortage existing in traditional ERP system, this paper puts forward a novel ERP framework based on Service-Oriented Architecture. Through publishing functional components into well packaged, reusable, easily maintained and cross-platform used services and using the WS-BPEL language to arrange those independent services, those business processes of ERP can be achieved to construct ERP system and integrate existing systems rapidly ultimately.
An Analysis on Implementation of Activity-Based Cost Management in Chinese Manufacturing Industry
Authors: Guo Li , Yang Yun
Published: June 2010

v
3D Visual Parametric Reliability Design System Development of Flange Based on ProEngineer
Authors: Yin Xiao Wei , Qian Wen Xue , Xie Li Yang
Published: June 2010

Flange is a common part in engineering, and it is tedious to build the 3D models of flanges repeatedly. Nowadays 3D modeling softwares are widely used in many engineering fields such as mining machinery, transportation and petrochemical. In practical engineering, it is necessary to compute the reliability of a flange. For these reasons a reliability design system of flange was developed with VC and Protoolkit. In this system, we only need to input several parameters to build a flange model and to compute its reliability. Also it is easy to determine the key sizes of a flange with an appointed reliability. The application of the software shown that using the software can improve the work efficiency and decrease the labor intensity of designers.
The Integrated Application Based on Order Moment Method and Improved Monte-Carlo Method in Mechanical Reliability Simulation
Authors: Yin Yong Feng , Zhang Jian Guo
Published: June 2010

Based on order moment method and improved Monte-Carlo method, this paper mainly studies the importance sampling method which combines with the first-order second-moment method, including how to get the sampling barycenter, how to get the importance distributing function and how to control sampling precision. Finally, the method studied in this paper is applied in actual engineering example and the verification result shows that the method is correct and effective and has higher engineering practical value.
Thermo-Mechanical Fatigue Behavior Investigation and Fracture Analysis on Austenitic Stainless Steel of Surge Line in Nuclear Power Plant
Authors: Xue Fei , Luo Zhi Feng , Yu Wei Wei , Liu Yan , Chen Xiao , Zhang Guo Dong
Published: June 2010

In order to confirm the structural integrity of pressurizer surge line affected by thermal stratification and thermal shock, the thermo-mechanical fatigue (TMF) behavior of the material used for surge line was investigated based on the real situation in the pressurized water reactor (PWR). Smooth, hollow specimens were subjected to in-phase (IP) and out-of-phase (OP) cycling in air under a mechanical strain control mode. For the sake of comparison, low cycle fatigue (LCF) tests were also performed at the peak temperatures of TMF cycling. The Nano Hardness Tester was used to test the nano hardness of the sample on the cut section surface. The results are shown that there is no significant difference between the IP, OP and IF lives in the investigated temperature ranges. The fracture analysis reveals that the crack initiation and propagation occurred in a transgranular mode under OP, IP and IF cycling condition, and a harden layer occurrence may be the cause of the crack initiation.
Fatigue Reliability Analysis Including Super Long Life Regime
Authors: Zhao Yong Xiang
Published: June 2010

For an engineering structure with an actual fatigue life over that corresponding to a so-called fatigue limit, appropriate reliability assessment and fatigue life prediction are essential for developing the structure and sustaining its high quality in service. Basic clues are explored. A competition fatigue initial mechanism is shown to provide a requirement of material primary quality management. Affordable deduced material and structural probabilistic S-N curves are presented by fitting into material mid-and-long life S-N data and fatigue limits and, then, comparing to structural fatigue limits. Random cyclic stress-strain relations are depicted for constructing random stressing history of structures. Reliability assessment and fatigue life prediction are established to synthetically consider the interference of applied stresses deduced from the random cyclic stress-strain relations and capacity strengths derived from the structural S-N relations with an expected life. Affordable and appropriate method has been then developed to realize the reliability assessment and fatigue life prediction including the super long life regime. Availability of the present method has been indicated through a reliability analysis to the velocity related reliabilities and fatigue lives of a railway axle.
Reliability Analysis of Shiplift Gear Based on System-Level Load-Strength Interference Model
Authors: Wu Ying , Xie Li Yang , Wang De Cheng , Gao Ji Zhang
Published: June 2010

A reliability analysis method for the shiplift gear according to the system-level load-strength interference model is presented. The gear is regarded as a series system with dependent failure and multiple failure models. Its reliability is obtained by calculating the probability that the minimum order statistic of the strengths exceeds the maximum order statistic of repeated random loads. The load probability distribution of gear is then obtained using Monte Carlo on the basis of load information. The contact strength and bending strength are calculated. On the basis of system-level load-strength interference analysis, system reliability of a gear is straightforward built up. Finally, system reliability of a gear is worked out, which shows a high reliability.
Design of Double-Deck Isolation Systems
Authors: Zhao Qun , Zhang Chen , Zhao Jin Fang
Published: June 2010

On the basis of the powerflow theory and four-end parameter analysis method, the responses and the powerflow characteristics of the vibration transfer path system are examined. The sensitivity of non-linear damping is employed as measurement criterion. The powerflow and powerflow sensitivity are obtained and the effect on powerflow and powerflow sensitivity of dry friction damping, fluid damping and structural damping is studied. Numerical results are also presented and discussed. It is supposed to study the sensitivity of these parameters, to estimate the effect of the change of parameters, to improve the design performance.
Lifetime Prediction of Product Based on Proportional Hazards-Proportional Odds Model in Accelerated Life Testing
Authors: Huang Ting Ting , Jiang Tong Min , Huo Rui Jian
Published: June 2010

Accelerated life testing can be operated in the designing process of a product to predict the lifetime of the product. The design of the product would be improved if the lifetime prediction value is not acceptable. This paper presents a method to predict lifetime of products based on proportional hazards-proportional odds model in accelerated life testing. Proportional hazards-proportional odds model makes proportional hazards model and proportional odds model special cases of it through transformation parameter. A testing system is established to process constant stress accelerated life testing for miniature bulbs under high stress levels and failure time data of the bulbs under each stress level are analyzed using proportional hazards-proportional odds model. Lifetime prediction of the miniature bulbs is presented finally.
Failure of Flip-Chip Circuit Interconnects under High Current Density
Authors: Lu Yu Dong , He Xiao Qi , En Yun Fei , Wang Xin , Zhuang Zhi Qiang
Published: June 2010

Both Al interconnects and flip-chip solder bumps were sensitive to high current. The failure mechanism of circuits interconnects would be more complicated if the current density in circuits was exceed the critical magnitudes of electromigration in both Al interconnects and solder bumps. The failure of circuit interconnects under different magnitudes of current density was studied and the interaction of electromigration in solder bumps and Al interconnects was discussed. The circuit interconnects of flip chip show three failure phenomena under high current density: voids in Al final metal, inter-diffusion of Al and SnPb, and melting of solder bumps. The voids in Al metal show the directional diffusion of Al atoms was mainly controlled by the electron wind fore. However the inter-diffusion of Al and SnPb demonstrated the electron wind force to Sn and Pb atoms would be ignored in contrast with chemical potential gradient or intrinsic stress. The flow of Sn and Pb atoms under high current density was in opposite direction with electron wind force and uniform with chemical potential gradient.
Fatigue Life Reliability Analysis of Belt Conveyor Driving Drums Based on FEM
Authors: Li Jia , Wang Lei , Wang Xin
Published: June 2010

Conveyer system security and reliability are related to belt conveyor drum design level .This paper proposes a method of analyzing the belt conveyer drum fatigue life reliability based on FEM, and establishes a real-time dynamic loading model, which can reflect accurately the condition of drum actual work load. This method realize drums fatigue life reliability analysis by applying rain-flow count method for processing stress spectrum that are obtained from FEM, it combines material P-S-N curves and other performance parameters and adopts Miner ruler. By applying the method on a practical project, the results indicate that the method is correct and practical. It poses the ability of avoiding the blindness in the drum structure size design, and it has the vital significance of raising drum design level.
Grey Model Based Particle Swarm Optimization Algorithm for Anticorrosion Reliability Design of Underground Pipelines
Authors: Liu Qin Ming , Dong Ming
Published: June 2010

This paper explores the grey model based PSO (particle swarm optimization) algorithm for anti-cauterization reliability design of underground pipelines. First, depending on underground pipelines’ corrosion status, failure modes such as leakage and breakage are studied. Then, a grey GM(1,1) model based PSO algorithm is employed to the reliability design of the pipelines. One important advantage of the proposed algorithm is that only fewer data is used for reliability design. Finally, applications are used to illustrate the effectiveness and efficiency of the proposed approach.
Diffuse Response Surface Methodology to Reliable Optimization of Numerical Control Milling
Authors: Zhang Pei Pei , Tao Hua , Yin Zi Dong
Published: June 2010

The selection of adaptable machining parameters is a key part in numerical control (NC) milling process. Deterministic optimal parameters are obtained without considering the uncertainties of machine tools. So a reliable optimization method was introduced in this study. We focus on a response surface methodology (RSM) adapted to reliability-based design optimization (RBDO) based on Diffuse Approximation (DA). A variant of the first order reliability method (FORM) is chosen to calculate the safety index. Case study is investigated for the NC milling operations of ultrahigh strength steel. We show how to get the optimal parameters with the safety index by the reliable optimization method.
Scale-Induced Effects on Fatigue Properties of the Cast Steel for Chinese Railway Rolling Wagon Bogie Frames
Authors: Zhao Yong Xiang , Yang Bing
Published: June 2010

Scale-induced effect is investigated on the fatigue properties to the grade B cast steel for China railway rolling wagon bogie frame. Three kinds of structure-like specimens with production structural surfaces and different scales were fatigued in a manner of group tests at same stressing amplitude. Their fatigue properties are compared with those of material specimens. Fracture surface observations reveal that the fatigue cracks were initiated from the material casting shrinking cavities with/or hot ties. Distinct fatigue striations, river-like flowers, and second cracks appeared in perpendicular to the fatigue crack path. Lots of dimples appeared in the transient fracture zone to indicate a ductile fracture. Slight deference was observed that more dimples are for material specimen. To consider the scattered fatigue properties, effective sectional area-fatigue life relations are established for the structure-like specimens. And then, a probabilistic model is established for the scattered effect factors on fatigue lives. An effective application is given for constructing structural probabilistic S-N relations including super-long life regime from material S-N curves.
The Determine Method of Maintenance Strategy for Multi-State System
Authors: Mao Yi Lan , Kang Rui , Ma Lin , Xu Zhe Han
Published: June 2010

The theory of system multi-state is used in the time-based maintenance strategy, the determine process of product state for component-level and system-level is known. The maintenance model for multi-state system which is based on statistical data and risk loss considered is constructed. The investigation index for availability of maintenance strategy is analyzed and then the simulation is used to determine the maintenance strategy.
Effects of Thermal Exposure on Low Cycle Fatigue Behavior of Ti600 Titanium Alloy
Authors: Yu Teng , Wang Lei , Zhao Yong Qing , Liu Yang
Published: June 2010

Effects of thermal exposure on low cycle fatigue behavior of Ti600 alloy were investigated by LSCM, SEM and TEM. The results demonstrated that both the NTE specimens and the TE specimens showed the cyclic softening, within a total strain amplitude range from ±0.45% to ±1.00%. Since the α2 phase precipitated in the αp phase during thermal exposure, the resistance of fatigue crack propagation of αp phase could be increased by the precipitation of α2 phase. Therefore, the low cycle fatigue (LCF) lives of Ti600 alloy after thermal exposure were longer than those without thermal exposure, at the same total strain amplitude.
Life Prediction of Constant-Stress Accelerated Degradation Testing Using Time Series Method and Grey Theory
Authors: Wang Li , Li Xiao Yang , Jiang Tong Min , Huang Ting Ting
Published: June 2010

This paper proposes a new life prediction method using time series and grey theory to predict product life based on Constant-Stress Accelerated Degradation Testing (CSADT) data. CSADT degradation data is modeled using time series method and predicted using grey theory. A four electric stress levels CSADT of miniature bulb is conducted to verify the proposed method. A comparison among life prediction by the proposed method, traditional methods, and real life of miniature bulb is processed. The result shows that life prediction by the proposed method is more accurate than traditional methods.
Twice-Modeling Approach for Concurrent Process Planning without Forced Decoupling
Authors: Song Xiao Wen , Hong Zhi Hua
Published: June 2010

A strategy other than forced decoupling or tearing to solve the problem in concurrent design process planning is produced. Twice-modeling concept is proposed by building an Information Flow Matrix (IFM) based on the influence of relationships between information flows during task execution. After re-constructing the IFM to determine the order levels of information flows, the provider-receiver relationship between tasks and information flows are used to instruct the planning of the key tasks. A design task is then decomposed according to the usage or supply of information flow. Adaptive subdivision of design tasks is realized based on synchronous mapping of Coded Design Structure Matrix (C-DSM) and IFM. Finally the whole design process planning is completed by the priority definition of the subtasks and a DSM based level generate algorithm. The proposed method is illustrated by an application to the vehicle overall design process planning. The “pseudo coupled” or “pseudo dependent” relationships are eliminated effectively without forced decoupling and the concurrency of the whole design process is improved obviously.
Deformation Analysis for Welding Assembly Processes of Automobile Panels
Authors: Liu Yu , Liu Jian Xin , Yan Shu Yi , Wang Zhi Min , Zhang Bing
Published: June 2010

Welding process of automobile panels is a key process in the manufacturing of automobile body and its quality directly impact on the appearance and quality of automobile. The causes of dimensional deviation of welded assembly could be workpieces variation, assembly tooling variation, and welding distortion. As a major source of assembly deviation, dimensional variations of workpieces have important effects on the assembly quality of automobile body. In this paper, pre-stressing was used to reflect the workpieces’ variation and the node coupling method was used in the numerical simulation to predict the deformation of assembly caused by the welding process of automobile panels. And further the computation results were listed and compared with the measured ones.
A Linear Goal Programming Model for Weight Calculation in Fuzzy AHP and its Application in Product Development
Authors: Yan Li Jun , Li Zong Bin , Yang Xiao Chun
Published: June 2010

The key issue of FAHP application is how to derive fuzzy weights from fuzzy pairwise comparison matrix. The most of applications, however, were founding avoiding the use of sophisticated approaches such as fuzzy least squares method and using a simple extent analysis method to derive fuzzy weight from pairwise comparison matrix for the sake of simplicity. But the extent analysis method proves to be incorrect and may lead to a wrong decision result. So, this paper proposes a sound yet simple linear goal programming model to derive weights from pairwise fuzzy comparison matrix, which takes minimizing inconsistence degree of comparison matrix as objective and obtain a normalized weight vector finally. The proposed model is validated by an application to new product development scheme screening decision making.
Combinatorial Pulsed Laser Deposition and Thermoelectricity of (Ca1-xAx)3Co4O9 (A: Sr, Ba) Composition-Spread Films
Authors: Wang Qun Jiao , Xu Min , Zhang Yi Bin
Published: June 2010

(Ca1-xAx)3Co4O9 (A: Sr, Ba) composition-spread films were fabricated successfully on TiO2 (100) substrate by combinatorial pulsed laser deposition (CPLD), and their thermoelectric (TE) properties and structure were evaluated by the multi-channel thermoelectric measurement system and concurrent X-ray analysis respectively. The largest power factor in (Ca1-xSrx)3Co4O9 film library was achieved as 1.67µW/cmK2. The influence of substitution on TE properties was investigated by doping Sr2+ and Ba2+ ions into Ca3Co4O9. However, there was little change of Seebeck coefficient in the range of 0≤x≤0.1 for (Ca1-xAx)3Co4O9 (A: Sr, Ba) films, which suggested that the substitution ions with smaller size were potential candidates for good TE properties.
Vibration Effects on Tailstock of a Turning Machine
Authors: Bidgoli Hassan Sharifi , Mahdavinejad Ramezan Ali
Published: June 2010

Machine tools as a main device in manufacturing and production lines are widely used nearly in all branches of industries. Precision continuation of these systems with times and against inspected shocks is necessary and very important. Turning as a main kind and high usage machine tool is used in many industrial parts production, especially those with rounded sections. Spindle, tailstock and bed in machine tools play engraving role in dimensional accuracy. In this paper the vibration effects on the tailstock of a turning machine during its operation, is analyzed. For this purpose, a LZ330 VS machine from Weiler Co. in Germany is modeled with Solid Works software. This model with IGES format is transferred to ANSYS 5.4 analytical software. In this area, the model is analyzed via modal and transient dynamic analysis. The results show that, the more tailstock’s sleeve length, the less critical frequency amount.
Evaluation Method to Determine Perpendicular Error of Spindle Units Using Transformation Matrix
Authors: Qu Zhi Yong , Ye Zheng Mao
Published: June 2010

A 3-DOF simulation turntable with perpendicular errors is introduced. The characteristics of period and variation in the perpendicular error are liable to bring about orientation error, which is a function of the overall static inaccuracy. Aimed to compensate orientation error, a perpendicular error calibration method is proposed to measure the perpendicular error between the axis and the bushing of a rotating axis in simulation turntable. Based on transformation matrix, gesture transformation matrix with various error items is achieved. As a result of this analysis, perpendicular error analysis is carried out when this measurement result is applied to a simulation turntable. Furthermore, this study also permits the user to know how to minimize some error sources of the simulation turntable.
Traffic Service Level Evaluation and Analysis for Urban Expressway
Authors: Liu Quan , Luo Yong , Li Hui
Published: June 2010

The microwave vehicle detection can obtain real-time conditions of road traffic flow fast, accurate and convenient. In this study, we took the expressway traffic flow in Chengdu as the research object, collecting real-time data of traffic flow, speed and vehicle density to analyses the relationship among Q, V, K graphically. Finally the service level in different lanes and speed in the Third Ring Road were evaluated through Q, V, K data calculations and analysis in Chengdu’s expressway at the traffic peak time.
The Analysis System of Ultrafine Particles Dynamic Light Scattering Signals Based on B/S Mode
Authors: Li Zhen Mei , Shen Jin , Liu Wei , Li Wen Ge
Published: June 2010

By integrating network technology, virtual instrument technology, video image network transmission and web page fusion technology, the analysis system of ultrafine particles dynamic light scattering signals based on B/S mode was developed，Through internet explorer, the remote client can browse the real-time monitoring data, such as diameters of particles, the autocorrelation function curve, inversion results, power spectrum density, time-frequency distribution. The photon counting technology was applied in the system to replace the expensive correlator, the real-time data of ultrafine particles dynamic light scattering were analyzed by using Burg arithmetic of AR model, Much useful information of the particle size can be obtained by comparing the power spectrum of standard polystyrene particles scattered light signals of 450nm, 300nm, 200nm.
A Kind of Watershed Image Segmentation Method Based on Combination Pre-Processing
Authors: Wang Jin Xi , Liu Lin Xiang , Li Xiu Zheng
Published: June 2010

The watershed algorithm has been widely used in image segmentation for its characteristics of accurately positioning edge, simple operation and etc. But it also has drawbacks of easy to over-segmentation and loss important outline for the character of sensitive to noise. Aiming at the problem of over-segmentation of watershed algorithm, the paper brought out an improved image segmentation algorithm based on watershed, which can limit the number of existing regions that are allowed with combination pre-processing steps, so that the over-segmentation problem can be better solved. The result of experiment also verifies the correctness and feasibility of the proposed algorithm in the paper.
Signal Integrity of Power and Ground Plane Related to Vias in High Speed Embed System Board Design
Authors: Zhu Wen Long , Chen Jian Qing , Liao Le Ping , Chen Wen Xiang
Published: June 2010

The operation speed of modern embed system has been upgraded from several hundred MHz to GHz. The signal vias through power/ground plane can have strong coupling effect and result in signal integrity problem. Analytical model including calculation of resonant frequencies, fields for simple rectangular structures can be used to estimate the resonant frequency and ideal position to place signal vias. Based on FDTD algorithm, a numerical modeling of powerd/ground plane with lumped elements is presented. The coupling effect between signal vias in power/ground plane with lumped elments can be analyzed by this model. Finally, coupling effect between signal vias under different conditions are discussed and some methods to improve signal integrity are proposed.
SHRDIS: A Semantic-Based Heterogeneous Relational Data Integration System
Authors: Wang Jin Peng , Zhang Ya Fei , Lu Jian Jiang , Miao Zhuang
Published: June 2010

Integrating and querying data from heterogeneous sources is a hot research topic in database research field. The emergence of the Semantic Web brings new paradigm shift of computing in data integration research where data is heterogeneous and distributed. To solve the problem this paper proposes a semantic-based approach. A Semantic-based Heterogeneous Relational Data Integration System, called SHRDIS, is presented. In this system, ontology is used as the mediated schema for the representation of the data source semantics. SPARQL queries over global schema are rewritten into local SQL queries that can be executed on heterogeneous relational databases. The architecture and implementation of SHRDIS is illustrated in detail. The experiment results show that the SHRDIS system has nice performance and scalability.
Pressure Fluctuation Based on Cascade Correlation Algorithm in Draft Tube
Authors: Wang Li Ying , Zhao Wei Guo
Published: June 2010

The cascade-correlation(CC) is presented as a neural network growing technique which allows one to gradually build network architecture without the need to redefine the number of neurons to be used in a feed forward. In view of the actual situation that the corresponding space curved surface which expresses pressure fluctuation in draft tube is too complex to be analyzed, considering the pressure fluctuation in draft tube, the network model is established based on CC algorithm and it is applied to hydropower station. Comparing with BP neural network, the experimental results show the prediction precision of the final model is higher and the prediction values are in better agreement with the real values.
Speech Algorithm for Watermarking Relational Databases Based on Weighted
Authors: Zhang Ye Hong , Gao Zhi Xian , Yu Dong Xian
Published: June 2010

We enunciate the need for watermarking database relations to deter data piracy, identify the characteristics of relational data that pose unique challenges for watermarking. This paper creatively proposes a novel method for watermarking relational database, which uses speech signal as watermark embed into database according to the weight of attributes. Experimental results show that the proposed scheme is robust against various forms of attacks. Our approach is more intuitive, and it support easy watermark identification.
Traffic Sign Recognition Based on SIFT Features
Authors: Cai Ni An , Liang Wen Zhao , Xu Shao Qiu , Li Fang Zhen
Published: June 2010

A recognition method for traffic signs based on an SIFT features is proposed to solve the problems of distortion and occlusion. SIFT features are first extracted from traffic signs and matched by using the Euclidean distance. Then the recognition is implemented based on the similarity. Experimental results show that the proposed method, superior to traditional method, can excellently recognize traffic signs with the transformation of scale, rotation, and distortion and has a good ability of anti-noise and anti-occlusion.
The Data Fusion for MIMO Radar
Authors: Zeng Jian Kui , Dong Zi Ming
Published: June 2010

Multiple Input Multiple Output (MIMO) radar is a new emerging radar technique developed recently. In this paper, the principle of MIMO Radar based on transmitting diversity is described and then the data fusion technique for MIMO radar is presented. In this method, the detection result of each detector of MIMO radar is integrated in data fusion center, a final detection result is get which includes all the information of each detector result.
Study of Backoff Algorithm in Broadband Power Line Networks
Authors: Ji Chun Lei , Sun Qiang
Published: June 2010

As the characteristics of power line channel varies over time, makes it be different from the tradition networks. In this paper, we study the performance of a form of slotted binary exponential random backoff algorithm using in HomePlug protocol. The performance of the backoff algorithm is evaluated by simulation. The results show that it makes the network performance become worse with the expansion of network.
An Economic Analysis of Photovoltaic Industry
Authors: Ye Tao
Published: June 2010

The development of photovoltaic industry can produce great socio-economic implications in terms of induced production and job creation. The world photovoltaic market has been growing and will be strongly influenced by photovoltaic costs and available technologies.. The overall cost to implement a facility for module production having a capacity per year that may be regarded as the minimum profitable size for module production in China is considered. An input–output analysis is used for assessing the relative economic impact on production and employment. A sensitivity analysis shows that the results are reasonably robust.
A Replica Selection Decision in Cloud Computing Environment
Authors: Li Jing
Published: June 2010

Data replication is adopted to improve data access performance in cloud computing environment. When different sites hold replicas, there are significant benefits while selecting the best replica. In this paper, we propose a new replica selection algorithm based on prediction. Analyzing the factors infecting replica selection, The grey system theory is utilized to help predicting the data response time on the basis the GM(1,1) grey dynamic model; Meanwhile the Markov chain is applied to achieve state transition probability matrix to predict the reliability of replicas in the form of probability by the system state classification. The simulation results show that in our replica selection model, the prediction is valid, helpful to selection decision, and is able to achieve load balance between nodes holding replicas.
Rolling Bearing Fault Diagnosis Based on Wavelet Packet Feature Entropy-MFSVM
Authors: Zhao Wei Guo , Wang Li Ying
Published: June 2010

On the basis of wavelet packet-characteristic entropy(WP-CE) and multiclass fuzzy support vector machine(MFSVM), the author proposes a new fault diagnosis method of vibrating of hearings，in which three layers wavelet packet decomposition of the acquired vibrating signals of hearings is performed and the wavelet packet-characteristic entropy is extracted，the eigenvector of wavelet packet of the vibrating signals is constructed，and taking this eigenvector as fault sample multiclass fuzzy support vector machine is trained to implement the intelligent fault diagnosis. The simulation result from the proposed method is effective and feasible.
Improved Web Text Classification Method for Classifying Quality Safety Accidents
Authors: Pan Shou Hui , Wang Li , Xu Ying Cheng , Xia Guo Ping
Published: June 2010

Web text classification, as one of the fundamental techniques of web mining, plays an important role in the web mining system. An improved term weighting method is proposed in this paper. Besides term frequency, the location of the term is also considered when calculating the weight of a term. Web pages were divided into 4 text blocks and each text block has its location weight. Experimental result shows that the precision of improved term weighting method is higher than traditional term weighting method.
Nanocrystalline Phosphors for Lighting and Detection Applications
Authors: Summers Christopher J. , Menkara Hisham M. , Gilstrap Richard A. , Menkara Mazen , Morris Thomas
Published: June 2010

We report the development of new nanoparticle phosphors and quantum dot structures designed for applications to enhance the color rendering and efficiency of high brightness white LEDs, as well as for bio-sensing applications. The intrinsic problem of self-absorption, high toxicity, and high sensitivity to thermal quenching of conventional quantum dot systems has prevented their adoption to LED devices. Doped Cd-free quantum dots may circumvent these issues due to their distinct Stokes shift and improved stability at high temperature. We report on the modification of Mn-doped ZnSe/ZnS core-shell quantum dots for application to the (blue diode + yellow emitter) white LED system. Band gap tuning for 460 nm excitation, inorganic shell growth and in-situ monitoring for enhanced efficiency, and analysis of thermal stability will are reported.
Solving Complex Thermal and Mass Transport Problems with the Lattice Monte Carlo Method
Authors: Fiedler Thomas , Murch Graeme E. , Belova Irina V.
Published: June 2010

The Lattice Monte Carlo (LMC) method recently developed by the authors is an unusually powerful and flexible method in which a given phenomenological thermal or mass transport problem is mapped onto a fine-grained lattice which is then analyzed with discrete random walk methods. We provide an overview of the LMC method. For mass diffusion we highlight the addressing of diffusion with reversible reaction. For thermal transport we highlight a calculation of the effective thermal conductivity of sintered hollow sphere structures making use of CT scans of actual material as well as the determination of temperature profiles in phase-change composites.
Synthetic Properties of the c-Axis Tilted AlN Thin Films
Authors: Chung Chung Jen , Wei Ching Liang , Hsieh Po Tsung , Huang Chao Yu , Lin Jen Fin , Chen Ying Chung , Cheng Chien Chuan
Published: June 2010

Aluminum nitride (AlN) is one of the most popular piezoelectric materials for high frequency resonators, filters and sensors. The piezoelectric property, i.e. electromechanical coupling coefficient, of AlN thin film is highly related to its crystalline orientation. AlN thin films with various c-axis-tilted angles can be fabricated by the RF sputtering technique. The crystallization and grain growth orientations of AlN thin film are examined by XRD, SEM, and TEM, while the bonding condition and nano-mechanical properties are investigated by a raman system and a nano-indentation technique.