bluuebunny/crossref_metadata_2025 huggingface dataset:
A Stochastic Characterization Based Data Mining Implementation for Airport Arrival and Departure Delay Data
Authors: Wu Qian
Published: October 2014

The probabilistic distribution of Airport arrival and departure delays over a selected period of eight months was analyzed using an optimal Generalized Extreme Value (GEV) model in this paper. It is anticipated that quantitative stochastic characterizations of delay data out of our work would improve demand predictions in air traffic flow management systems. Analysis and verification through application of Beijing Capital International Airport’s history flight delay data demonstrate better Goodness of Fit of our optimal GEV based model.
An Improved Blind Deconvolution Algorithm of Motion Blurred Image
Authors: Yang Lei , Wang Ze Feng , Guo Hui Nan , Liu Guang Sen , Wang Hao , Tang Li Nao , Yang Hong Tao
Published: October 2014

An improved blind deconvolution algorithm has been proposed to tackle the image blurring caused by movement. Firstly, take the model to analyze the blurred image and identify the high-frequency of the blurred image through the reasonable pre-estimation of blind kernel function. Then, further estimate the blurring matrix K by the use of the high-frequency while the high-frequency of the blurred image and the accuracy of the blurred image matrix have been improved gradually through normalized iteration. Finally, the clear image has been gained by the use of blind matrix deconvolution. Experimental results show that by the use of this algorithm the image has better subjective visual effect. The proposed algorithm has better restoration effect on the fused motion blurred image and the natural camera motion blurred image.
Inverse Eigenvalue Problem for a Class of Upper Triangular Matrices with Linear Relation
Authors: Li Zhi Bin , Li Shuai
Published: October 2014

This paper studies on the eigenvalue[1-5] of the a class of upper triangular matrix with linear relation. It discusses the feature of existence and uniqueness of matrix via two given two characteristic pairs(λ,χ),(μ,γ) . Solutions and expressions are provided under satisfied conditions. The possibilities are exanimated by numerical example.
Motion Redirection Based on Markov Chain Monte Carlo Particle Filter
Authors: Song Jin Bao , Ye Long , Zhang Qin , Chai Jian Ping
Published: October 2014

This paper aims at the difficulty that lack of observation model and high-dimensional sampling in video tooning, proposes a method based on key frame matching and dual-directional Markov chain Monte Carlo sampling of video motion redirection. At first, after extracting the key frame of a given video, By affine transformation and linear superposition, the subject initializes the video’s space-time parameters and forms the observation model; Secondly, in each space-time, based on the bi-directional Markov property of each frame, This paper proposed a dual-directional Markov chain Monte Carlo sampling particle filter structure and takes full advantage of the relationship of the front and back frame of the parameters to estimate motion redirection parameters. At the same time, for high-dimensional sampling problem, the subject according to the directional parameters’ correlation implements classification of skeleton parameters-morphological parameters-physical parameters, proposes a hierarchical genetic strategy to optimize the output parameters and improves the efficiency of the algorithm. The research of this paper will produce an efficient and prominent animation expressive video motion redirection method and play an important role on video animation of the development.
Multi-Attribution Classification Based on Lower Integral with Genetic Algorithm
Authors: Chen Ai Xia , Li Jun Hua
Published: October 2014

Fuzzy integral has been widely used in multi-attribution classification when the interactions exist between the attributions. Because the fuzzy measure defined on the attributions represents the weights of all the attributions and the interactions between them. The lower integral is a type of fuzzy integral with respect to fuzzy measures, which represents the minimum potential of efficiency for a group of attributions with interaction. The value of lower integrals can be evaluated through solving a linear programming problem. Considering the lower integral as a classifier, this paper investigates its implementation and performance. The difficult step in the implementation is how to learn the non-additive set function used in lower integrals. And Genetic algorithm is used to solve the problem. Finally, numerical simulations on some benchmark data sets are given.
Real-Time Unwrapping and Rectification of High-Resolution Catadioptric Panoramic Video during Non-Stationary Moving
Authors: Wang Jian , Zhang Zhen Hai , Li Ke Jie , Shao Hai Yan , Xu Tao , Hou Shuai , Zhang Liang
Published: October 2014

Catadioptric panoramic vision system has been widely used in many fields, and also plays a very important role in environment perception of unmanned platform especially. However, the resolution of system is not very high, usually less than 5 million pixels at present. Even if the resolution is high, but the unwrapping and rectification of panoramic video is carried out off-line. Further, the system is also applied in stationary state or low stationary moving. This paper proposes an unwrapping and rectification method based on high-resolution catadioptric panoramic vision system used during non-stationary moving. It can segment dynamic circular mark region accurately and get the coordinates of center of circular image real-timely, shorten the time of image processing, meanwhile the coordinates of center and radius of the circular mark region would be obtained, so the image distortion caused by inaccurate center coordinates can be reduced. During image rectification, after achieving radial distortions parameters (K1, K2, K3), decentering distortions parameters (P1, P2), and the correction factor that has no physical meanings, we can used those for fitting the rectification polynomial, so the panoramic video can be rectified without distortion.
The Cauchy Problem for Impulsive Transport Equations
Authors: Ye Guo Bing , Wang Xue Bin , Huang Li
Published: October 2014

The paper studies the Cauchy problem for impulsive transport equations. The solution of the equations is obtained by using the iterative method and the characteristic method. An example is given to illustrate our result.
The Semi-Discrete Finite Element Method for the Cauchy Equation
Authors: Hou Lei , Sun Xian Yan , Qiu Lin
Published: October 2014

In this paper, we employ semi-discrete finite element method to study the convergence of the Cauchy equation. The convergent order can reach. In numerical results, the space domain is discrete by Lagrange interpolation function with 9-point biquadrate element. The time domain is discrete by two difference schemes: Euler and Crank-Nicolson scheme. Numerical results show that the convergence of Crank-Nicolson scheme is better than that of Euler scheme.
Automatically Collect the Adjectives and Calculate their Sentiment Intensity in the Sentiment Analysis
Authors: Wang Hui , Ji Xiao Hong , Ma Jun
Published: October 2014

In order to automatically expand high quality polarity adjectives as much as possible by using the WordNet, three types of query strings are used in this study. Among them, the third type of query string is the most important. Besides ‘synonym’ and ‘antonym’ relations, we also use ‘similar to’ and ‘also see’ relations of the WordNet. In fact, the last two relations are more important than the first two ones. With the help of the newly proposed method, we can calculate the sentiment intensity of those expanded adjectives exactly. Abundant experiments demonstrate that our improved POAE algorithm is very effective in expanding and ranking adjective seed list in the sentiment analysis.
Feature-Weighted Local Support Vector Machine of Particle Swarm Optimization
Authors: Cui Wen Bin , Mu Shao Min , Yin Chuan Huan , Hao Qing Bo
Published: October 2014

Local support vector machine gives the feature same weight in classification. In fact, many datasets have some weak or irrelevant features related to the classification. Thus giving features same weight may reduce the classification accuracy of local support vector machine.This paper puts forward a new local support vector machine that the feature weight is optimized by PSO (Particle Swarm Optimization), it is tested on the international standard UCI data sets and the images of tree taxonomy data sets, the results show that the accuracy of the algorithm we proposed is better than the general local support vector machine.
A New Approach for Determining Bolt Load of Eccentric Bolted Joints
Authors: Wang Xi Wang , Li Xiao Yang , Wang Xiao Guang , Zhang Lin Lin
Published: October 2014

Bolt load in a bolted connection directly influence the safety of a design in regard to both static and fatigue loading as well as in the prevention of separation in the connection. When the separating force is applied off the bolt center, although the materials for the bolted joint remain in the linear elastic range, the interface contact area between the clamped plates is sensitive to both the magnitude and the location of the separating force. This often causes nonlinear variation of the bolt load, the deformation etc. An analytical model is proposed to obtain the expression for the nonlinear bolt load under a separating service load. Finite element modeling is used for evaluating the accuracy of the proposed model.
Video Redirection Parameters Optimization Based on Hierarchical Genetic Optimization Strategy
Authors: Song Jin Bao , Ye Long , Zhang Qin , Chai Jian Ping
Published: October 2014

In the process of particle filter, it can produce the problem of particle degeneration, and the amount of computation is very big. In order to solve these two problems, this paper presents a method for video redirection parameters optimization based on hierarchical genetic optimization strategy. This paper adopts hierarchical mutation operator and local crossover operator. The result shows that the hierarchical genetic optimization algorithm which is used in video tracking has a very good effect.
A Novel Denoising Method Based on Ensemble Empirical Mode Decomposition – Principle Component Analysis
Authors: Feng Yang , Huang Xiao Diao , Chen Jie , Hong Rong Jing
Published: October 2014

Equipment performance degradation model is a key component in its diagnosis and prognosis models. As to slewing bearing, vibration signals are usually non-stationary and with strong white noise, which makes it very difficult to extract useful information from the signals. Therefore, an Ensemble Empirical Mode Decomposition – Principle Component Analysis (EEMD - PCA) based method was proposed to denoise the vibration signals and performance degradation model was established by PCA. To verify the proposed method, an experiment was conducted and the life cycle vibration signals were acquired. After denoising, performance degradation model was established to explain the denoising performance. Results show that the proposed method acquired a better denoising performance than EEMD-MSPCA, which provides a potential for further research.
Progressive Contours Simplification Approach Constrained by Terrain Feature
Authors: Yang Zu Qiao , Li Hong Sheng
Published: October 2014

To maintain terrain details during contour group simplification, a progressive simplification approach is proposed. First, terrain feature points and lines are extracted from contours. Second, both the extracted terrain feature points and lines are taken as constraints and quantified as control variables. At last with the idea of progressive graphics simplification, the non-feature points, feature points, feature lines and their associated curves on contours are selected or deleted progressively to realize dynamic simplification of contours. Experimental results show that this approach can effectively improve the intellectualized degree of contours simplification.
Water Hazard Detection Based on 3D LIDAR
Authors: Shao Hai Yan , Zhang Zhen Hai , Li Ke Jie , Wang Jian , Xu Tao , Hou Shuai , Zhang Liang
Published: October 2014

Autonomous off-road navigation is a highly complicated task for a robot or unmanned ground vehicle (UGV) owing to the different kinds of obstacles it could encounter. In-particular, water hazards such as puddles and ponds are very common in outdoor environments and are hard to detect even with ranging devices due to the specular nature of reflection at the air water interface. In recent years, many researches to detect the water bodies have been done. But there still has been very little work on detecting bodies of water that could be navigation hazards, especially at night. In this paper, we used Velodyne HDL-64ES2 3D LIDAR to detect water hazard. The approach first analyzes the data format and transformation of 3D LIDAR, and then writes the data acquisition and visualizations algorithm, integrated data based on ICP algorithm. Finally according the intensity distribution identifies the water hazard. Experiments are carried out on the experimental car in campus, and results show the promising performance.
Research on a Kind of Quick Background Motion Compensation Algorithm Based on BRISK Operator
Authors: Lei Yan Min , Feng Zhi Bin , Ji Shu Jiao , Xing Xiao Xue
Published: October 2014

In order to solve the real-time problem in the background motion compensation in video sequence, a kind of quick background motion compensation algorithm based on BRISK operator has been proposed in this paper. Firstly, feature points of two adjacent frames images was extracted and matched by using BRISK operator. Secondly, the motion vector of the neighboring frames images was calculated by using the least square method (LSM). Lastly, the video sequences were compensated by using bilinear interpolation method. The simulation results show that real-time can arrive at ms grade and meet the requirement of background motion compensation.
Design of a Wideband Vivaldi Antenna Array
Authors: Zhang Bo
Published: October 2014

Phased arrays for use in future multifunction systems require wideband elements capable of wide angle scanning. Here we describe the design of a Balance Antipodal Vivaldi Antenna for use in large phased array antenna apertures. The BAVA element height and the array lattice spacing are about λ/2 at the high frequency end of a grating-lobe free operating band. BAVA elements do not require connection with adjacent elements and are therefore attractive for use in phased arrays with modular construction.
Design of Secure Cloud Storage System for Enterprise Information Resources
Authors: Zuo Jun , Zhu Zhen , Wang Jing Yan
Published: October 2014

In order to meet growing demand of storage resources, improve the security and integrity of enterprise information resources, this paper analyzes storage resources status and existing problems of Foshan XY Elec-Mech Limited Corp in the first. Based on detailed analysis of cloud storage hierarchy and its advantages, the cloud storage framework is designed to meet enterprise’s demands, security control strategies and backup strategies are also discussed. After implementation, the integration of information resources in multi-systems and multi-platforms may realized for providing users with massive information storage and access services. Furthermore, when disaster coming, multiple backups may be used to recovery for ensuring the continuity of enterprise’s business processing.
Implementation of QC-LDPC Decoder Based on FPGA for FSO System
Authors: Qiong Yan Guo , Hua Zhou Mao
Published: October 2014

QC-LDPC can bring a higher coding gain to the FSO system, but the complexity of the decoding algorithm restricted its application in high-speed FSO system.In this paper, it adopts an improved Modified Min-sum Algorithm (MMSA) to reduce the decoding complexity and save decoding time. In this paper, the author programs the decoder with VHDL Hardware Description Language and analyzes the static time of the design with Synplify Pro and QuartusII to verify the correctness. Moreover, each functional unit is downloaded to the EP3C16Q240C8 chip produced by ALTERA Company and encapsulated into the IP core. Finally, we used MATLAB software to build the FSO system for testing decoder performance. The results show that the QC-LDPC decoder based on FPGA has higher reliability in FSO system.
Multi-Courses of General Exam System Based on MAS
Authors: Yang Li Ping , Xu Da Wei , Wang Wei
Published: October 2014

The design of a multiple courses of general exam system development method based on MAS technology. This paper discussed the necessity of development system, the concept of MAS and the organizational structure of MAS, secondly analyzes the system framework, finally introduces the key technologies such as the multi-agent RPC communication model, online exam process etc..
A Distributed Algorithm for Data Collection in Low-Duty-Cycled WSNs
Authors: Liu Feng , Wang Yu Fei , Lin Mu
Published: October 2014

In order to prolong the lifetime of WSNs, low-duty-cycled scheduling is a widely used strategy. However, there exists high latency with traditional routing algorithms. In this paper, we model the data collection scheme of WSNs to be a delay optimization problem and propose a distributed algorithm based on Network Utility Maximization. The proposed algorithm can distributed find an optimal routing to achieve minimal average end-to-end delay. The simulation results show that our algorithm performs better than the traditional shortest path algorithm on end-to-end delay with less control message.
An Improved Bounding Box Localization Algorithm Based on Optimum Node Selection
Authors: Qian Kai Guo , Wang Yu Jian , Li Xiao Ming , Dai Zu Cheng
Published: October 2014

This paper mainly discusses the problem of localization algorithm for wireless sensor network. For improving the disadvantages of high positioning error and Low coverage, an improved algorithm is proposed based on the optimum node selection determined by the received RSSI strength and virtual anchor nodes. It uses anchor node to locate which selected within 0.5 communication scope of the node by RSSI signal strength. Nodes Completed positioning upgraded to virtual anchor nodes .Complete positioning upgraded to virtual anchor nodes to help neighbors to locate. It reduces the positioning error and improves the positioning accuracy. Simulation experiment shows that the positioning performance of improved algorithm is better than traditional Bounding Box algorithm.
Realization of SMS4 Algorithm Based on Share Memory of the Heterogeneous Multi-Core Password Chip System
Authors: Zhang Lei , Dong Ren Ping , Yu Ya Ping
Published: October 2014

In order to meet the rapid demand of the modern cryptographic communication, heterogeneous multi-core password system architecture is set up based on shared memory in Xilinx XUP Virtex-II Pro chip in this paper. Under this architecture, the encryption and decryption of the SMS4 algorithm is realized fastly. Make a contrast with the homogeneous multi-core password system and the heterogeneous one-core password system’s performance in the execution time, throughput and resource utilization of the SMS4 algorithm.The experimental results show that the heterogeneous multi-core password system which based on shared memory has better performance.
Research on the System of Image Acquisition and Wireless Transmission
Authors: Xiong Jiang , Pan Yong , Hou Zi Ye , Zhang Ren
Published: October 2014

Image acquisition and wireless transmission is a key technology in the Internet of Things. This paper reports a ARM Cortex-M4 processor hand-held based Image acquisition and wireless transmission terminal. The terminal utilizes STM32F407VGT6 as its master controller, respectively. It uses Nordic nRF24L01 as its wireless transceiver module and OV9655 as its camera module. The system works in 2.4GHz ISM microwave band and can capture images and wirelessly transmit images within 20m indoors and 50m outdoors. The actual measurement of image acquisition and transmission shows that this terminal is highly stable and comparable in 2.4GHz microwave frequency.
The Central Forwarding Mechanism of Residential Gateway
Authors: Tian Hong Cheng , Ma Jin Kui
Published: October 2014

Our home is becoming more and more intelligentized. In the home network, the residential gateway plays a key role in the data interchange between external networks and home network, this paper proposes an idea that the home network should guarantee a unique visiting interface. Furthermore, this paper designs and implements the central forwarding mechanism of the residential gateway, and exchanges between outer networks and home network must be through the residential gateway. This paper is of valuable reference for network researchers and engineers to be engaged in the further study on the home network.
Study on Intelligent Augmented Reality Tourist Guide Application Based on Android Smart Phone
Authors: Yu Yao Hua
Published: October 2014

This paper presents a study of an intelligent augmented reality tourist guide application aiming to run on Android smart phones. The strategy for positioning the target scene and intelligent planning strategy of tourist routes are proposed. Some important parts in the system implement stage are also described in detail. The results of a follow-up user study show that the intelligent augmented reality tourist guide application is very helpful for tourists, particularly enhancing self-guided tours and improving tourists’ experience in their touring.
Application of Gustav in Entertainment Places Fire Risk Assessment
Authors: Zhao Yun Tao , Wang Jia
Published: October 2014

Entertainment places have special structure; large fire load, personnel-intensive features, and function layout often change in the process of operation, so the fire risk level will change frequently. The current fire risk assessment studies for only one stage in entertainment places without considering the impact of risk factors at different stages. For this situation, this paper presents a fire risk assessment method in entertainment places based on full life cycle, divides the entertainment places into different stages, analyzes risk factors at different stages, and then uses the method of Gustav to get the fire risk levels of different stages. The assessment results show that the level of fire risk in entertainment places are different at different stages, you can take the appropriate risk control measures against fire risk factors at different stages, which has important guiding significance for fire risk management in entertainment places.
Study of Tidal Lanes on Traffic Controlling - Taking Zizhuyuan Road of Haidian District in Beijing as an Example
Authors: Wang Jing Xiong , Liu Dong , Zhao Yan , Wang Chen
Published: October 2014

Based on the analysis of setting principles of tidal lane, this paper describes the traffic and technical feasibility on setting tidal lane aat Xizhimen Outer Street between Chedaogou Bridge and Sijiqing Bridge, and then put forward a package on setting of tidal lane and control approaches of segment and endpoint. Through an analysis of the package, we expect to relieving road network pressure from tidal traffic and achieving the purpose of easing traffic congestion.
The Application of Speed Warning on Highway Using Anti-Dazzle Panel Based on Persistence of Vision Effect
Authors: Liu Jin , Ogata Yoshito
Published: October 2014

According to persistence of vision and the principle of color overlay, a new painting method of anti-dazzle panel is proposed. This painting method could allow drivers to see different colors under different speeds, which could be a means to inform drivers of their speeds. First the research analyzes the time of persistence of vision and the process of color overlay; then establishing the relationship between travel speed and color overlay based on persistence of vision; at last, using animation to simulating the method proposed in the research and illustrating the feasibility of this method.
Research on Information Demand and Publishing Framework about Public Infrequent Events Based on Residents Feature
Authors: Sun Li Shan , Qiao Jing , Luo Wei , Sun Ling
Published: October 2014

Traffic operation characteristics of the city gradually changed from simplicity to comprehensiveness. In this paper, different influence of episodic events was analyzing from angle of the students, commuter, retirees, according to the common accidental event types of public traffic. Combined with the SP public small sample survey, different residents requirement on information about type, location, prompting time was analyze and contingency information request form was constructed. Besides, the best information publishing channels of different groups was discussed and contingency framework was built. In addition, mobile phone APP mobile terminal was developed and the framework of information release was constructed. All in all, the goal is to solve the conflict between city residents travel demand and travel information accessibility, timeliness, accuracy, and to improve transportation efficiency.
Development of a Microscopic Simulation Based Performance Evaluation Model to Compare Operational Improvements with Capacity Additions
Authors: Tang Tang , Sun Da Zhi , Govindankutty Vipinshankar
Published: October 2014

The objective of this study is to develop a microscopic simulation model to objectively compare operational improvements with capacity expansions. Simulation software VISSIM was used to redesign the existing facilities for the performance evaluation of operational improvement and capacity expansion strategies from delay time, emission and fuel consumption perspective. Two case studies were performed with different test beds to evaluate the effectiveness of performance evaluation model, majorly involving dynamic speed, ramp metering and hard shoulder usage strategies which are discussed in detail to illustrate the changes due to operational improvement and capacity expansion strategies.
Aeolian Sand Size on the Surface of the Northern Foothill of Yinshan Mountain
Authors: Jiang Hong Tao , Guo Chun Rong , Hai Chun Xing , Liu Jun Xiu , Xie Yun Hu , Sun Shan Shan
Published: October 2014

Sand samplers were laid out in the grassland in the northern foot of Yinshan Mountain for collecting soil flux samples from 0 to 1.5m height above the surface from Mar, 1, 2008 to Feb,29,2009.Grain size parameters proposed by Folk and Ward, including average, SD, skewness and kurtosis of grain size were used. The vertical distribution of grain size characteristic of sediments trapped by sand samplers in different seasons was analyzed by using electrical mirror technology. The results indicated that size of aeolian sand in desert steppe is mainly sand and silt. The content of coarse silt, very fine sand and medium sand are 20~60%,10~30% and 10~20%,respectively,in the sediment–for all seasons. As height increased, the content of sand decreased while silt increased and the mean size of particle changed from fine sand to very fine sand. The mean diameter of particle ranged from 2.4~4.2and standard deviation ranged from 0.7~1.5Skewness is positive with the value ranges from 0 to 0.2,while Kurtosis mainly concentrated on 0.7 to 1.3.
Research on the Water Safety Early Warning for Rural Safe Drinking Water Projects in Qingdao
Authors: Jin Li , Li Ya Wei , Li Qing Guo
Published: October 2014

Water safety early warning is an essential and important basis for sustainable rural safe drinking water projects management and running. in this paper, we firstly analyzed the major influencing factors to water safety early warning. Secondly we establish a water supply safety early-warning assessment index system, and give classification standards for water supply safety early-warning assessment. Further, with the fuzzy assessment theory we propose a fuzzy warning assessment model approach. Finally the model and methods are used in Qingdao, and obtained t the rural water safety early-alarm level is ‘middle warning’.
The Production Status and Treatment for Rural Solid Waste in Hainan Province
Authors: Zhao Shu Qing , Ma Hong Zhi , Zhang Feng Ying , Wang Qun Hui
Published: October 2014

According to the characteristics of rural household garbage and the realistic conditions of rural areas in Hainan Province, and based on the experience of the rural household garbage processing, this paper discusses the rural garbage recovery processing pattern, funds and management of Hainan province and other relevant problems, in order to provide suggestions and comments about the processing of rural household garbage for Hainan as a tourist province.
The Reconstruction of Lead Contamination History Using Tree Ring, Jinan, China
Authors: Gao Wei Dong , Jiang Wei , Wang Xiao Jun , Min Zhang , Xiong Tian Qi
Published: October 2014

In this document we analysis the lead contamination in tree ring of Platycladus orientalis and Poplar, and found that lead concentrations in contaminated tree rings has a good relationship with industrial dust emissions and automobiles, the lead contamination in tree ring can reconstruction the lead contamination history of Jinan. The case study in Jinan, showed that trees can provide continuous monitoring data for assessment of trace metal pollution in the future.
The Analysis on Environmental Protection, Energy Saving and Green Design of Agricultural Machinery
Authors: Sun Qin , Li Zuo Li , Yu Hui , Zhang Jin Sheng
Published: October 2014

The energy saving and environmental protection design of agricultural machinery is a new design concept. Based on the analysis of meaning and significance of agricultural machinery energy saving and environmental protection design, Elaborated the trends of energy saving and environmental protection of agriculture machinery. The paper also pointed out that the green design is the inevitable trend of the development of agricultural machinery.
Application of Fractal Theory in Supply Chain Requirements Forecast
Authors: Xu He , Ming Zhao
Published: October 2014

Accurate forecast of demand is an important prerequisite to raise supply chain performance. In this paper, the author proposes a forecasting model of supply chain demand basing on the fractal theory. In this model, the historical temporal series is transformed into cumulative sum series to fit the total fractal distribution and the method of Equal-length and Changeable-dimension using Compensating Figure is introduced in to improve the accuracy of long-term forecasts. Analysis the real data of a certain supply chain and the numerical study proves the validity of the prediction model.
Case Analysis of CNC Grinder by Comprehensive Optimization Based on Entropy Weight of Reliability Evaluation Model
Authors: Teng Yun , Cun Yan Ping
Published: October 2014

Entropy weight comprehensive optimum seeking method is one of the optimization methods of reliability evaluation model. In the optimization process, several empirical models and multiple evaluation indexes were proposed for selecting a best model of reliability evaluation models. Entropy weight is defined to show the importance of evaluation indexes simultaneously. In this paper, an application case of CNC grinding machines was used to describe the optimization method in detail. The analysis result showed that the optimal reliability distribution model of CNC grinder is the mixed welbull distribution, and the method is reasonable and effective.
Comprehensive Evaluation of Thermal Power Units Based on Nonlinear Principal Component Analysis
Authors: Shang Li Qun , Wang Shou Peng
Published: October 2014

In order to improve the operation and management level of thermal power units, and to achieve the goal of saving energy and reducing consumption, the nonlinear principal component analysis (PCA) was proposed to assess the operating condition of fossil-fired power plants comprehensively, which can resolve the problem on the evaluation of multiple indicators. This method improves the traditional PCA by eliminating the relativity. Moreover, this paper applies the nonlinear PCA to evaluate the operating state of power plants, which can reduce the dimensions of the indicators and abstract the principal components. It can provide the high reference value for the power generation group on how to implement saving energy, optimal operation, indicators evaluation and competition in thermal power units. The practical example shows that the proposed method is effective.
Modelling of Shaft Part Information Based on Domain Ontology
Authors: Liu Xue Bin , Wang Xi Bin , Li Chong Ning , Jiao Li
Published: October 2014

For the parts information describing in decision-making process of CAPP system, with the concept of domain ontology, part information model, which includes four information layer(parts layer, feature layer, topology layer and process layer), has been established, a hierarchical description of process information has been achieved while build a domain ontology model of shaft parts by using the protégé, a ontology editing software. using a stepped shaft part as example illustrate the information indicating of the part information model in order to verify the feasibility of the model has been created, it has laid a good foundation to build process knowledge database for the CAPP system.
Error Model of Machine Tool Based on Cutter Contacting Point Vector Chain
Authors: Deng Yong Hong , Cao Shu Kun , Lv Jie , Zhang Kun , Song Kai Feng
Published: October 2014

Error modeling and analysis can improve the manufacturing precision and the error compensation accuracy of machine tool. According to the surface of the parts topography information, this paper puts forward a kind of error model of machine tool based on cutter contacting point vector chain. Based on analyzing the cutter contacting point of one tool path which is on the surface of the parts, Based on analyzing action rules of a single cutter contacting point error, the cumulative rules of errors and calculation methods were introduced detailedly, and an application demonstration is given.
Experiment and Numerical Simulation of the Local Loss in Axial Guide Device
Authors: Lv Yu Kun , Wang Tong
Published: October 2014

In order to determine the pipeline characteristics of the sand-wind simulation system, using the closed wind tunnel system, the partial loss of the fan’s pre-axial guide device was obtained from experiments at different openings. The partial loss of the axial guide device was simulated at different boundary conditions with FLUENT [1]. The simulation and experiment results were compared and a plan of setting reasonable boundary conditions was confirmed. A feasible method of using numerical simulation to predict the characteristics of dusty weather simulation pipeline system was developed.
Force Analysis on Piston Assembly of Mine Rotor Wet Spraying Machine
Authors: Feng Kai Lin , Chen Yi Peng , Ma Guan Guo , Li Qiang
Published: October 2014

The force of the concrete pumping work of mine rotor wet spraying machine is analysis in this paper, focusing on the piston assembly and cylinder bore rotor stress analysis during nesting, selecting the important structural parameters and optimizing the structure, to ensure the normal and efficient function of wet spraying working to improve the stability of wet spray machine work and life, and providing an important reference for the structural design of the piston assembly.
Joint Application of UG/ADAMS/ANSYS in the Analysis of Landing Gear
Authors: Zhu Han Qi , Wu Nai Ming
Published: October 2014

The landing gear occupies an important position in the design, manufacture and use of the aircraft. But it spends a lot of time and resources in a real experiment. The rapid development of computer simulation technology makes it possible to have a virtual analysis of the landing gear. Based on typical CAD software UG, finite element simulation software ANSYS and virtual prototyping software ADAMS, a mixed rigid-flexible nose landing gear model is constructed in this paper. The joint application will play their advantages respectively.
Non-Linear Dynamic Modeling and Experiment of Harmonic Gear Drive
Authors: Zhang Hui Bo , Pan Bo , Wang Long , Wei Cheng , You Bin Di , Zhao Yang
Published: October 2014

A non-linear torsional vibration model of harmonic gear drive is proposed in the current study. The model includes clearance, nonlinearity torsional stiffness and nonlinearity damping. The clearance model is developed by introducing the piecewise-linear displacement functions. The function of nonlinearity torsional stiffness is obtained by torsional stiffness experimental. The model of nonlinearity damping is used to describe the process of transmission. The non-linear differential equations are solved using Runge-Kutta method. The numerical simulation results show that the influence of nonlinear factors on dynamic behavior, which has chaotic characteristics, is remarkable.
Optimization and Analysis of Z-Type Flexure Hinge Based on Workbench
Authors: Bao Hui Xue , Liu Qiang , Wang Rong Qi , Zuo Cheng Ming , Zhou Xiao Qin
Published: October 2014

Flexure hinges are regarded as the critical components of the compliant mechanisms, its performance is one of the significant factors which could directly determine the merits and demerits of designed compliant mechanisms. So how to optimize the flexure hinges becomes the key step in designing processes of compliant mechanisms. In view of the presented importance of flexure hinges, this paper proposes a sort of multi-objective optimization method which can rapidly analyze the sensitivity and interactional laws between the performance indexes and the structural parameters of flexure hinges with the Workbench software, then to select the optimal parameters by combining with the actual working conditions of flexure hinges. Finally the finite element analysis is employed to analyze the optimization results and verify the effectiveness of proposed optimization method.
Simulation and Analysis for Composite Casing Aging Trend Based on ANSYS
Authors: Liang Ying , Cui Chun Yan
Published: October 2014

According to the aging characteristics of composite casing, we have established the composite bushing model of different radius with the ANSYS finite element analysis software, and analyzed the defects in different forms and the action under different mechanical stress. At the same time, we have studied the aging trend of composite casing and compared with the similarities and differences between the aging of composite insulators. The result showed that under the mechanical stress the bigger than the smaller aging deformation was more serious, and the defect forms had no obvious influence on the development of aging. Thus, the composite casing artificial accelerated aging test should increase the role of mechanical force factor, while the composite insulator aging research methods and conclusions should also increase the qualification when applied to silicone rubber composite casing.
Statics Analysis and Modal Analysis of the Beam Structure of Wave-Maker Based on Finite Element Analysis
Authors: Wang Shou Jun , Mao Xue Hui
Published: October 2014

In order to achieve lightweighting in the Beam Structure of Wave-maker, it’s necessary to have the statics analyzed for model in the finite element method, results showed that the stiffness and strength have the bigger margin, and it can satisfy design requirements fully, which is the allowable deformation is less than 2 mm, maximum yield strength is less than 325 Mpa. At the same time, in order to get each order modal which the beam, and determine the wave frequency that the need to avoid. Carry on modal analysis of the beam in this paper, results showed that the wave frequency of the wave machine is far less than which each order natural frequency, so the resonance phenomenon caused in the process of work is out of consideration. This research method provides a basis for the design of the beam and optimization.
Structural Stiffness Optimization Under Dynamic Loads
Authors: Teng Xiao Yan , Tao Jia Wei , Han Jia Shan
Published: October 2014

Most studies are focused on topology optimization techniques under external static loads. However, all forces are dynamic in real world. Mathematical optimization with dynamic loads is almost impossible in a large-scale problem. Thus, the bi-directional evolutionary structural optimization method (BESO) is extended to the topology optimization problem of structure under transient dynamic loading. Structural stiffness optimization is performed with the objective of reducing the mean compliance during the whole load-time history. By the dynamical analysis, the stiffness optimization model is established based on BESO method. In this method, the material volume is taken as the constraint condition, and the minimum mean compliance of structure is taken as the objective function. A cantilever under harmonic load has been taken as a numerical example to show the effectiveness of the proposed approach.
The Impact to WELDOX960 Steel Welding Joint Made by Strength Match
Authors: Wang Zhi Ling , Ding Xiao
Published: October 2014

As new generation of low alloy high strength steel, WELDOX960 is extensively applied into heavy-duty fields including engineering machine etc. This paper adopts mixed gas protection welding to make multi-layer and multi-channel welding to low alloy high strength steel WELDOX960, using match methods with different intensities to prepare six groups of samples, respectively. The performances including joint tension and impact etc are tested for analysis after welding. The result shows that backing welding is the most important technique process in multi-layer and multi-channel welding, which has significant impact to joint performance, in the precondition that the strength is satisfied, if the material with lower strength is taken as backing layer, toughness and plasticity of the joint can be improved significantly. For example, tensile strength of sample 50-90 reaches 966.3Mpa, which is the same as 90-90, however, its toughness increases by 15%.
The Radial Fretting Character Research of the Shaft-Hub of Compress Impeller Based on Virtual Orthogonal Experiment
Authors: Lu Xue Long , Zhao Jun Sheng , Huang Xin Zhong , Wang Shuang Yong
Published: October 2014

A three-dimensional model of as haft-hub of compressor impeller was set up by Pro/E. Based on the ANSYS; the finite element model was established, using the analysis method of combining submodle and paramesh. The shaft-hub of compressor impeller was simulated by virtual orthogonal design optimization method. Based on the fact that there existed radial fretting in the shaft-hub interference fit joint, researching the influence significance order and law of interference, friction coefficient and rotating speed to the maximum unit frictional work , the average friction work and the optimized parameter were obtained. It turned out that the results of the numerical simulation and orthogonal experiment were accurate and reliable, with the friction and wear effectively reduced, certain guiding references to actual assembly process were got.
Treatment of Substructure Rigid-Body Modes in Close-Loop Coupling Disc Brake Squeal Model
Authors: Gao Pu , Du Yong Chang , Xia Huai Cheng
Published: October 2014

It’s found that the rigid-body modes of brake pads and brake caliper have significant influence on squeal occurrence while analyzing disc brake squeal problems using close-loop coupling disc brake squeal model. The modal shapes of these rigid-body modes calculated from finite element method (FEM) are linear combination of multiple translational and rotational motions, which is unfavorable for further analysis. In this paper, method to achieve ‘pure’ rigid-body modes such as translations along and rotations on its principal axes of inertia is presented. Modal shapes derived from this method consist with those from FEM model under suitable constraints. The result is used in substructure modal composition analysis on a disc brake squeal problem, where the effects of specific rigid-body modes can be shown clearly. The method is helpful for researchers to choose right measures to suppress squeals.
Liquid Crystalline PET/60HBA-MWNTs Composite: Synthesis, Characterization, and Properties
Authors: Wang Jiang Wei , Bai Xiao Mei , Li Zong Hao , Zhang Yao , Wang Yan Ping , Wang Yi Min
Published: October 2014

PET/60HBA-MWNTs Liquid Crystalline Polyester (LCP) composite was synthesis by melting polymerization process with a novel method of reacting in acetic anhydride solution. FTIR, XRD, POM, TGA and mechanical properties tests were applied for the characterization of modification of nanotube, crystallization property, thermal and mechanical properties. The results indicate that thermal and mechanical properties of LCP polyester are all enhanced with 0.3wt% MWNTs addition. The degradation temperature (Td) increased for 8°C and the modules, strength and breaking elongation are increased by 39.0%, 62.3% and 46.4% respectively.
Research on Coanda Effect Appeared in Oil-Air Annular Flow through the Conical Diffuser
Authors: Sun Qi Guo , Wang Ying , Wang Xiong Shi
Published: October 2014

Physical model and numerical simulation model for oil-air annular flow through conical diffusers are built by Fluent, and Coanda Effect, a commonly phenomenon, appeared in this kind of oil-air annular flow field is studied, especially influences of Coanda Effect on the attachment of the liquid phase of annular flow trended to the curved wall are analyzed in detail by changing expansion angles to calculate the radial pressure distribution and pressure drop, employed numerical simulation method, in this paper. The simulation results show that the expansion angle has a great influence on the attachment of liquid phase in annular flow to the curved wall, the radial pressure gradient is an important factor of the Coanda Effect which make the liquid phase of annular flow convey near the wall, and the radial pressure gradient will decrease but the pressure drop increase when the expansion angle becomes larger. These conclusions will provide useful reference in designing pipelines conveying the two-phase annular flow in oil-air lubrication system.
A Transformation-Based Integrated Modular Avionics Software Model Construction Approach
Authors: Wang Ying , Wang Jian Yong , Wang Lei
Published: October 2014

Modern avionic software usually runs on the ARINC653-compatible OS based on the Integrated Modular Avionics (IMA) architecture. Although existing ARINC653 annex of Architecture Analysis & Design Language (AADL) can be used to construct IMA models straightforward, it is still hard and error-prone work for avionics engineers because of the complexity of ARINC653 and manual modeling. Therefore, a hierarchical transformation-based approach is proposed to obtain correct IMA models step by step from general AADL models, rather than its ARINC653 annex. The typical transformation algorithm is given and a tool is also developed to help accomplish this approach automatically and effectively.
Low Temperature Densification of ZnO-Based Ceramic Using Phenolic Resin as Binder
Authors: Zeng Hui , Xie Jing Jing , Liu Hai Tao , Fu Zheng Yi
Published: October 2014

ZnO-based ceramic was densified at low temperature by using PSP as binder. The results showed that phenolic resin filled in the ZnO grain boundary layer. The sample has a well hardness of 0.8 GPa and bending strength of 78 MPa. The effect of temperature on the microstructure and mechanical properties was also investigated. It was found that the samples sintered at 300 °C showed higher density and better mechanical properties.