bluuebunny/crossref_metadata_2025 huggingface dataset:
NURBS Curve Real-Time Interpolation Feed Speed Planning for CNC Machining
Authors: Zhao Jing , Li Li , Wang Guo Xun
Published: September 2014

In order to solve the problem of large amount of calculation and real time is not high in the process of NURBS real-time interpolation feed speed planning, offline feed speed planning method is proposed, the method plan speed in non real-time cycle, and generate the feed speed curve. In order to meet the machine tool dynamics constraint, the maximum acceleration and the jerk constraints were considered fully in the planning process. The simulation analysis show that the proposed method can greatly reduce the amount of computing tasks in real-time interpolation cycle, improve the real-time performance of interpolation; At the same time, the speed curve of the planning satisfies the requirement of machine tool dynamics, has the good effect of feeding speed smooth, is helpful to improve the interpolation precision.
User Modeling in Adaptive Human-Computer Interface for Turret
Authors: Xue Qing , Li Ming Rui , Han Xuan , Liu Min Xia
Published: September 2014

User modeling is an important strategy for designing effective user interface. User model for turret is different with general application. This paper concerns on modeling user of turret. Main emphasis is given on the relationships of man, machine and environment. The user models can help determine the characteristics of the turret user and how they affect the design of the adaptive interface. In this paper we present the progress of user model development and give some case studies using the proposed model.
Kinematic Optimization of Corn Full-Automatic Transplanting Mechanism with Non-Circular Gears Based on Matlab
Authors: Zuo Yan Jun , Li Wen Ge
Published: September 2014

In order to guarantee the high and stable yields, improve the economic benefits and promote the transplanting technology of corn. The pitch curve of non-circular gear is fitted based on quasi uniform B-spline theory, corn full-automatic transplanting mechanism has been invented, and its kinematics mathematical model has been built through analysis of transplanting mechanism. The computer aided analytical and optimized software has been developed on software Matlab’s platform. Through tuning the data points by man-machine interaction, pitch curve of non-circular gear and structural parameters are optimized, until track and attitude of mechanism meet the demands for corn transplanting process. The 3 actions of taking, transportation and planting corn transplantation can be achieved orderly by a mechanism.
Design of Output Feedback Controller for Switched Fuzzy Systems with Time-Delay
Authors: Yang Hong , Lü Huan Huan , Zhang Le
Published: September 2014

This paper investigates the problems of stabilization and control for time-delay switched fuzzy systems using output feedback controller. Based on the linear matrix inequality (LMI) technique, multiple Lyapunov method is used to obtain a sufficient condition for the existence of the controller for the output feedback. Then an algorithm is constructed to transform the sufficient condition into a LMI form, thus obtaining a method for designing the controller. The designed controller guarantees the closed-loop system to be asympototically stable. A numerical example is given to show the effectiveness of our method.
Design and Analysis of a Novel Heavy-Load Positioner with Series-Parallel Mechanism
Authors: Tang Yan Hua
Published: September 2014

A heavy-load positioner with series-parallel mechanism was put forward according to the heavy-load positioner’s task demand. Two rotational DOFs were realized by the spherical 3-DOF mechanism with a restricted embranchment instead of traditional gear-driven mechanism, the other by the serial part. The mechanism has the advantages of large workspace, good flexibility and high stiffness-to-weight ratio. The kinematics, statics and singularity of the positioner mechanism were analyzed. The mathematic model of the positioner mechanism was established. Combining the workspace demand of the positioner, dimension optimization of the mechanism was researched. Finally, the kinematics,statics and the singularity analysis of the positioner mechanism was verified through virtual prototype designed with one group of satisfied dimensions.
Research on the Simulation of Tension Control System of the Traction Wire Rope Cleaning and Detection Line of Pay-Off Unit
Authors: Li Guo Ping , Gao Yan Fei , Wang Cheng
Published: September 2014

Take the traction wire rope cleaning and detection line of pay-off unit as an example, investigate the general law of the change during paying off of traction wire rope cleaning and detection line and build the mathematical model in each step of the paying off tension control system. Build the simulation model using MATLAB on the foundation of the mathematical model and research on the model. Afterwards, it is proved that the demand of keeping the tension of pay-off unit constant can be meet through regulating magnetic braking torque of pay-off unit.
A GPS-Assisted Calibration Algorithm for Misalignment Angle between Star Sensor and Strap-Down Inertial Navigation System
Authors: Zhang Yi Ming , Wang Wei , Sui Jie , Wang Xue Yun
Published: September 2014

As a high precision attitude measuring instrument in arc-second level, star sensor has become a necessary component for satellites, spacecraft and space station. However, star sensor misalignment angle can reach the arc-minute level and reduce the accuracy of the star sensor’s output severely. Since it’s difficult to measure the initial alignment error precisely on the ground, research applicable to star sensor misalignment angle calibration technique is necessary. To make the system get a high precision attitude control, a GPS-assisted Kalman filter modeling of the system was carried out. Finally, the misalignment angle from the board axes to the star sensor axes can be estimated by employing the derived relationship. The mathematical simulation results show the effectiveness of the calibration algorithm.
A Hybrid Keyword Extraction Method Based on TF and Semantic Strategies for Chinese Document
Authors: Wang Su , Wang Ming Ya , Zheng Jun , Zheng Kai
Published: September 2014

Keyword extraction is important for information retrieval. This paper gave a hybrid keyword extraction method based on TF and semantic strategies for Chinese document. A new word finding method was proposed to find the new word not exist in the dictionary. Moreover the semantic strategies were introduced to filter the dependent words and remove the synonyms. Experimental results show that the proposed method can improve the accuracy and performance of keyword extraction.
A Study of RCS Parallel Computing Based on MPI and FDTD
Authors: Wang Li Feng , Wu Ze Yan , Meng Zhi Jun
Published: September 2014

FDTD(Finite Difference Time Domain) method is widely applied to many branch of computational electromagnetics because of its simple principle and programming. In general, 10 gridding must be used in a wavelength, and time pedometer is restricted because of the request of numerical dispersive and Courant stability condition. Thus, a large number of memory and computational time will be consumed when big dimension and complex structure object is considered, which is beyond the capability of single computer. FDTD Parallel computing technology is a available choice. We researched the computation of RCS based on FDTD and MPI, and the program was done, and its correctness was tested by comparing different result.
Design and Validation of Extended CSP Model
Authors: An Jing , Zhang Lei , You Chun Lan
Published: September 2014

CSP method is very effective for analyzing security protocol, find security attack. But because of the limitation of limited resources, only limited instance verification can be completed. To make up for the inadequacy of CSP protocol model, the CSP mode lis extended to solve the problem of limited detecting in this paper. And then it is proved that the correctness of the extended model based on the related definitions and propositions by using the method of theoretical proof, from several aspects, such as data type of the model, process of trusted agent, process of intruder, process of manager.
Experimental Installation for the Study of Nozzles Microturbines
Authors: Sazonov Timofey V. , Fershalov Yuriy Ya. , Fershalov Mikhail Yu. , Fershalov Andrey Yu. , Ibragimov Damir I.
Published: September 2014

Describes the experimental setup for studying the nozzles. Presents a methodology of the experiment and data processing of the results.Keywords: turbine, nozzle, nozzle box, small-size turbo machines, microturbines, velocity coefficient.
Development of Research on Process Algebra
Authors: An Jing , Liu Zhi , Qian Lu Feng
Published: September 2014

Process algebra is an algebra method of concurrency theory. Based on the relevant theories of process algebra, it is set forth several class process algebras and the important role they played in the development history of research on process algebra according to two breakthrough of process algebra. Finally it is introduced the applications of algebra process in the protocol verification, workflow description and other areas.
Dynamic Simulation of Four-Bar Mechanism Based on MS Excel
Authors: Chen Li Jun , Bai Xue Wei , Wang Xing Gang
Published: September 2014

In this paper, Four-bar mechanism is included to analyze the typical motion characteristic of mechanic design. A model is developed using MS Excel, and three dynamic visualized algorithms are employed with simple and convenient function modules within the software. Emphasis is placed on the establishment of model and the comparison between different approaches to simulate.
Local Access and Security Strategies of Medical Data
Authors: Tao Chen , Ying Zeng Shao , Yu Jiao Liang
Published: September 2014

Hospital network office automation system could make the hospital connected by a PC, terminal equipment, medical equipment and hospital networks to link up and connected to the Internet. In this paper, the star tree on the hospital's existing network structure transformation, using port aggregation technology upgrades to existing network data transmission and improve the operating efficiency of the entire hospital network, and the hospital server, computer workstation security configuration and remote management configuration, database and application development of all types of information systems are a good network support.
Numerical Solution of Nonlinear Volterra Integro-Differential Equations of Fractional Order by Using Adomian Decomposition Method
Authors: Wang Li Feng , Ma Yun Peng , Yang Yong Qiang
Published: September 2014

In this work we present a computational method for for solving a class of nonlinear Volterra integro-differential equations of fractional order which is based on Adomian Decom-position Method. Convergence analysis is dependable enough to estimate the maximum absolute truncated error of the Adomian series solution. Numerical example is included to demonstrate the validity and applicability of the method.
Gravitational Potential Energy Recovery and Recycle of Rotary Drilling Rig Kelly Bar
Authors: Li Xiu Lei , Wu Yong
Published: September 2014

In order to improve the economic benefits of tunneling to rotary drilling rig ,in this paper ,the rotary drilling rig main winch hydraulic system was improved ,by increasing an hydro pneumatic accumulator storage and releasing gravitational potential energy of kelly bar ,as well as increasing reversing motor and the main winch motor to form a hydraulic transformer .So ensured the high pressure when the energy release and reduced the rotary drilling rig engine power ,what’s more ,this system’s feasibility had been verified by theoretical calculation .
Improved Design of Large Tractor on Human-Machine Research
Authors: Liu Li Li , Mao Mi
Published: September 2014

In this paper, with the man-machine relations as the breakthrough point of the design, we study and analyze the existing large tractor’s defects and problems, based on the present situation of the large tractor on the market. Improved design for large tractor is completed, which makes large tractor model and function perfect and unified, and embodies the humanized design and requirements.
Study on the Method of Military Software Fault Diagnosis Based on Hybrid Reasoning Strategy
Authors: Wang Wei Feng , Sun Jing De , Xiao Qing
Published: September 2014

This paper focuses on the faults of military software system based on component. The faults are caused by external reasons during the using process of the software system. The method for faults diagnosis is based on the theory of expert system. The study finds that, there exist redundant questions during the reasoning process due to the uncertain factors and technical limitations of diagnosis system users. In order to improve the efficiency and reliability of military software fault diagnosis, a hybrid reasoning strategy was proposed. The strategy is based on the serial combination of uncertainty reasoning and interactive reasoning. Experimental result shows that the method based on the hybrid strategy for military software faults diagnosis is more accurate and flexible compared with the traditional reasoning method. The method also has improved the assurance work of military software system.
Research on Evaluation of Soil Fertilities of Farmland at County Level in Nongan Based on Data Mining
Authors: Ma Li , Chen Gui Fen , Cao Li Ying , Zhao Yue Ling
Published: September 2014

This research used the method of rough set and decision tree in data mining, building the evaluation model of soil fertility, to evaluate NongAn of Jilin province farmland productivity. Results show that the NongAn of arable land is divided into six grades, the fertility of grade one to six account for 6.77%, 14.29%, 23.78%, 23.51%, 20.13%, and 11.54% respectively. The farmland productivity difference is significant. The evaluation model of the evaluation results are in conformity with actual farmland productivity NongAn, avoiding the evaluation differences caused by the subjective factor, can effectively improve the soil fertility level classification accuracy and objectivity.
Influence of Structure Parameters on the Permanent Magnetic Planetary Gear Forced Vibration Frequency Response
Authors: Zhu Xue Jun , Xu Li Zhong
Published: September 2014

The time and frequency forced responses for the permanent magnetic planetary gear drive were computed and analyzed. The influence of magnetization intensity and pole pair number to frequency forced responses is discussed. Results show that the dynamic displacement when only considering output excitation is larger than that when only considering input excitation,and magnetic parameters have obvious effects on the low frequency vibration amplitude of elements. When magnetization intensity and pole pair number are too large or too small, they will seriously affect the dynamic performance of the system. So, selecting rational system structure parameters is very important, which can avoid system elements generating larger vibration.
Design and Application of Digital Tourism Platform
Authors: Zhao Li Li
Published: September 2014

The three-dimensional GIS network as a new tourist information platform for the development of tourism provides a new opportunity to network with an intuitive three-dimensional GIS, real, easy to operate features, compared to the previous two-dimensional GIS to better showcase the beautiful tour scenic landscape view, therefore, the network will become three-dimensional GIS platform development of the tourism industry on the basis of the supporting platform. This paper focuses on the design and implementation of tourism services platform to illustrate the three-dimensional GIS used in the travel industry network inevitability.
Intelligent Identification of Flow Regime Based on a Novel Neural Network
Authors: Wang Qiang
Published: September 2014

A noveol neural network of Elman is typically dynamic recurrent neural network. A novel method of flow regime identification based on Elman neural network and wavelet packet decomposition is proposed in this paper. Above all, the collected pressure-difference fluctuation signals are decomposed by the four-layer wavelet packet, and the decomposed signals in various frequency bands are obtained within the frequency domain. Then the wavelet packet energy eigenvectors of flow regimes are established. At last the wavelet packet energy eigenvectors are input into Elman neural network and flow regime intelligent identification can be performed.
Local Outlier Detection Algorithm Based on Coefficient of Variation
Authors: Zhou Shi Bo , Xu Wei Xiang
Published: September 2014

Local outliers detection is an important issue in data mining. By analyzing the limitations of the existing outlier detection algorthms, a local outlier detection algorthm based on coefficient of variation is introduced. This algorthms applies K-means which is strong in outliers searching, divides data set into sections, puts outliers and their nearing clusters into a local neighbourhood, then figures out the local deviation factor of each local neighbourhood by coefficient of variation, as a result, local outliers can more likely be found.The heoretic analysis and experimental results indicate that the method is ef fective and efficient.
Multi-Objective Optimization for Flight Instructor Scheduling
Authors: Wen Jun , Sun Shu Xia , Duan Hai Feng , Lv Jian Fei , Li Ming Xing
Published: September 2014

With the rapid development in civil aviation industry, the pilot is a lot of demand in short supply, which leads to high pressure on flight training. It is necessary to optimize the scheduling model for flight instructors and the urgency of the utilization of optimization techniques to realize flight instructor scheduling is increasingly significant. A fair and balanced scheduling model will take flight instructor’s willingness and flight duty time limitations into consideration. Therefore a multi-objective model of scheduling for flight training is provided,and the solution of the model is discussed.
Study on E-Government and its Decision Support System
Authors: Tao Jun , Yu Jiao Liang
Published: September 2014

Based on the analysis of E-government decision support system's basic theory and mainstream solutions, combined with the popular OLAP technology, presents a white spoon OLAP based decision support system to improve e-government program, using data warehouse and model library together to support OLAP analysis, test cases and successfully used with the project, the results show that this scheme can achieve the desired requirements, with better performance and fast response performance multidimensional analysis, OLAP operations can be completed with reference promotional value.
The Application Research Based on Arduino and Kinect
Authors: Li Guang Song
Published: September 2014

Arduino is a popular platform for interactive application. The posture recognition of human body is realized by the Microsoft’s Kinect sensor, and it translates the posture into data based on the protocol, and then transmits the data to the Arduino microcontroller through the serial port, and finally, the microcontroller controls the LED status according to data. Experiments show that, this method has higher recognition rate and shorter response time. The method can meet the somatosensory controlling requirements of the LED lamps, spreads the commonly controlling method of LED lamp.
Application of Topsis Method in Target Value Assessment of Infantry Division Joint Fire Strike
Authors: Zhan Huan , Dong Yu Cai , Chen Ping , Shan Cai Hong , Fan Hua Jing , Wang Hui Qi
Published: September 2014

According to the characteristics of infantry division joint firepower strike target value, the topsis method is adopted to analyze the target value and establish the target value analysis index system of joint fire strike. It provided a new approach to evaluate target value of joint fire strike infantry division.
Warehouse Management System Model Based on Petri Net
Authors: Guo Wei Ya
Published: September 2014

This paper bases on Petri net theory and related technologies, and establishes Petri net model for warehouse management system, which not only verifies the correctness of the model but also uses Petri net analysis method to analyze the model, lays the foundation of information platform configuration and development.
Fixture Fault Diagnosis in Multistation Assembly of Sheet Metal
Authors: Zhou Ling Hua , Xu Xiang Hong , Yu De Zhong
Published: September 2014

This paper presents a methodology for diagnostics of fixture failures in multistation assembly processes. Diagnosis matrix equation is established by state space equation and measurement equation, which study the conditions of deviation source diagnosis. The determination method of deviation source diagnosis is obtained. 3-D scanner is used to measure the key data. A case study illustrates the proposed method.
Health Assessment of Ecosystem in Manufacturing Enterprise Life Cycle Oriented
Authors: Zhao Nan , Li Qian , Shao Hong Yu
Published: September 2014

Based on the enterprise ecosystem theory and brittleness of complex systems theory, to propose the enterprise life-cycle manufacturing enterprise ecosystem health evaluation index system, from the growth, the stability, the resistance to brittle, the recoverability and the adaptability five dimensions, building enterprise ecosystem health index, applying Projection Pursuit Principal Component Analysis to achieve ecosystem health index calculation. By the example of Tianjin manufacturing enterprise ecosystem health evaluation, to verify an index system and algorithm reliability and operability constructed in the paper.
Research of Industrial Collaborative Manufacturing System on Based on Cloud Computing
Authors: Wang Chun Xiao , Guo Ying , Wang Jun , Li Liang
Published: September 2014

This paper analyzes the main problems in informatization of china's manufacturing industry, and researches an industrial collaborative manufacturing system for large and medium-sized manufacturing enterprises taking advantage of the benefits of cloud computing such as resource integration, elastic computing, mass data, and service integration. The system includes technical support system, business support system, security system and service portal, which providing design collaboration services, production collaboration services, business collaboration services, office collaboration services for enterprises, and forming a complete standard system. This will further promote the innovation of the service model and change of economic growth mode in our country.
Research and Development on a New Cylindrical Tea Carding Machine
Authors: Xu Hai Wei , Tan He Ping , Cao Jiang Ping , Liu Xiao Fei , Li Yan
Published: September 2014

A new cylindrical tea carding machine is designed based on studying the dynamic performances of the tea in machine including the analysis of tea carding machine theory and problem existing in traditional tea carding machines. The model of tea carding machine is established and the simulation analysis is studies by SOLIDWORKS. The result shows that the new cylindrical tea carding machine can improve the tightness of the tea strip more effectively and applicability than traditional machine.
The Design and Realization of HRA Service System for the Engine Assembly
Authors: Wang Yue Bin , Zhang Tong , Xue Qing
Published: September 2014

Human error is a main factor causing the engine assembly quality defects. This paper presented the application of the Root Cause Retrospective Analysis (RCRA) of the Cognitive Reliability and Error Analysis Method (CREAM) in the engine assembly process, proposed a new model of the RCRA for engine assembly failure within the framework of HRA (Human Reliability Analysis) service system for the engine assembly. The application of the model was illustrated by an example. The research belongs to one of the core functions of HRA service system, which can be used to perform the human error analysis in the process of the engine assembly, so as to provide guidance for production.
Application of ERP-Systems on Russian Construction Sites
Authors: Antipov Daniil , Gonyakina Ekaterina , Ptukhina Irina
Published: September 2014

This article deals with the possibility of using ERP-systems on Russian construction sites, the need for such a system, how to influence the work of the system in the construction process or increase the introduction of ERP-system efficiency of the enterprise. Also in this paper the question of compliance with established standards.It is shown that the ERP-system should be introduced to the Russian construction, if an investor wants to build your object with the required quality and in time. For the ERP-system in Russia is necessary to create a foundation that would be based on monitoring of standards by means of algorithms and information systems by filling out electronic forms. ERP-system provides objective information to make competent management solutions.
Product Development Model Focused on the Telecommunication Service
Authors: Barrionuevo Silva Rodolfo Rodrigues , de Paula Lacerda  Santos Adriana , Lacerda Santos Filho Mauro , Sotsek Nicolle Christine
Published: September 2014

This article presents an analysis of the main reference models of Product Development Process (PDP) and specificities of the telecommunications industry. The research instruments used to collect the data was semi-structured interviews, direct observation and document analysis in two companies, in order to map and analyze their PDP. It was noticed that there was similarity of the steps of the Case Studies PDP with the reference models, especially the model of [4]. The main differences were the feasibility analysis, the assessment by the customer of the preliminary product concepts, and the emphasis on commercial and operational development. It was also noted that the PDP of the companies had no strong influence of practices and business processes. Their PDP were more involved in the ​​strategy area, infrastructure and with the product of eTOM framework.
Research into the Virtual Simulation and Scheduling Optimization Technology in Ship Dock Assembly Process
Authors: Wang Chong
Published: September 2014

This paper summarizes the application of virtual simulation in the shipbuilding industry, especially points out research status of the key resources of shipbuilding (Ship Dock). Finally, the idea is put forward that a virtual simulation based on both intelligent algorithm and QUEST to improve the efficiency of ship dock.
Study on Human Errors in Substation Based on GEMS
Authors: Xu Shi Wei , Lv Hong
Published: September 2014

The accidents of substation can cause great losses, and human errors are the major factor that affect the safe operation of the substation, so study on human errors is of great significance for the safety management department to formulate countermeasures to prevent malignant electric operation accidents. General Error Model System (GEMS) is a dynamic model that study Cognitive processes of human performance, it has a certain value in terms of human reliability assessment, forecasting and optimization, etc. It offers prediction of human performance under certain operating conditions, it has a certain significance in improving cultivation of designer and strengthening human performance.
Study on Optimization of same Route Departure Flights
Authors: Wang Jian Hui
Published: September 2014

One of the prevalent methods in air traffic control is ground holding based on traffic flow management. The thesis is studied from the restriction of departure capacity and some air control rules which bring to a programming method of the same route departure. That is to take the best way to line up a group of departure aircrafts in designated times which hold for take off,and it to modify airlines timetable to smooth traffic peaks at airport during rush-hours. Also in the thesis it brings to some simple checking computations and judgments,including a kind of calculating method for the system in complicated conditions which is made to be the form of technological process chart.
Configuration Model Research Based on Product Family Configuration Unit
Authors: Zhao Han , Zong Wei , Wu Guo Bin
Published: September 2014

Explaining how to set up configuration model from the Angle of product family, for the composition of product configuration model of product family structure was analyzed, put forward the definition of product family configuration unit, and used it as the basic elements of product family configuration model. Using various granularity of product family configuration units set to do the unified expression for function, the principle and structure of all products contained in the product family. And did further analyze for the characteristic, types, and associated constraints of product family configuration units. Finally, described the modeling process of product family configuration model. Do verification by the dumper.
Researching Oil Purification Equipment System Fuzzy Reconfiguration
Authors: Tang Yong Ming , Hu Guang Zhong , Wang Xu Xu
Published: September 2014

Complexity and reuse-ability are found in process of design and product oil purification equipment, reconfigurable design and study the product and resources reuse are of practical significance. By fuzzy theory and reconfigurable design method, oil purification equipment reconfigurable design system function modules are built; Modular construction techniques for each equipment system configuration module product demand are utilized. By the method of object-oriented programming, reconfigurable design platform is built, the efficiency of product design is proved, and the resource reuse is realized.
The Design of Portable Electric Cooker
Authors: Jin Hong Yan , Zhu Zhi Wei
Published: September 2014

In the future, if we can be able to eat tasty rice at any time and if it can be to save space will be the decisive standards of a rice cooker. Nowadays, the Market need for a new portable rice cooker to improve the lives of office workers. First, to understand all various parts of the rice cooker in the structure, thereby conducted a survey on office workers to understand the style feature needs of their rice cooker. Finally we will design a new kind of rice cooker that is easy to use and carry.
Sensitivity Analysis of the Elastic Properties of Rail Vehicle Suspensions on Vibration Based on the HXN5 Locomotive Model
Authors: Zhou Hao , Xu Bin , Zhang Jian Wu
Published: September 2014

The dynamic performance of suspensions plays direct role in vibration control of railway vehicles and also has great impact on the ride comfort and operation stability. For assessment of the influence, a method of sensitivity analysis was performed, in which a Multi-Body System (MBS) dynamic model for the HXN5 locomotive counting for significant DOFs and nonlinearities was developed in SIMPACK platform and validated by real tests. More than tens of dynamic simulations were performed by a variety of damping and stiffness coefficients of the primary and secondary suspensions. By simulation, it is found that the vertical stiffness and damping of the primary suspension have the most sensitive influence. The lateral stiffness of the primary suspension, the longitudinal and lateral stiffness as well as the longitudinal and vertical damper of the secondary suspension possess the least effect on the railway locomotive vibration characteristics. It is also shown parameters of the longitudinal stiffness of the primary suspension, the vertical stiffness and lateral damper of secondary suspensions are of intermediate influence.
Study on the Shock Isolation Performance of the Woodpecker’s Head
Authors: Mao Hua Bing , Huang Qi Bai
Published: September 2014

The two-degree-of-freedom (two-dof) shock isolation system has been presented based on the woodpecker’s head structure. The effect of the system parameters on the performance of the shock isolation system has been studied by using transient responses and shock response spectrum. The results show that appropriate parameters can effectively reduce the maximum acceleration and displacement of the woodpecker’s brain. The discussion provides a new insight to the shock isolation mechanism of woodpecker’s head, and would be useful for the design of shock isolation.
The Design of New Lock Keyhole and Cylinder
Authors: Wang Hong Jun , Wu Hao
Published: September 2014

This essay will find a new way to prevent technical unlocking and violence through the cylinder lock through the narrow cylinder bore for the purpose of improving the performance of the theft. The miniaturization of the keyhole and cylinder locks, it makes the lock cylinder by means of the implementation does not have enough space, greatly limits the unlocking illegal activities. Meanwhile, the new lock cylinder has the advantage of mutual opening rate lower.
Impact on the Performance of Micro-Nozzle Straight Exit Section
Authors: Tong Jun Jie , Fang Yun Hui
Published: September 2014

The FLUENT6.3 software is applied to simulate the supersonic flow in micro convergent-divergent nozzle. The simulation is complemented by computing steady 2-D Navier-stokes equations to analyze the pressure contour and velocity contour inside the micro nozzle which has straight exit section or not and the length of straight exit section l. Also the performances of fluent mass coefficients and thrust force efficiencies are studied. The numerical results show: That the nozzle has straight exit section or not and the section length l affect the pressure contour and velocity contour inside the thruster. Compared to the nozzle that has no straight exit section, the minimum pressure region and the maximum velocity region are close to the center of exit in the nozzle that has straight exit section. Also the affected region is increased. When the throat Reynolds number Re is small, the flow coefficient Cd and thrust coefficient ηF firstly increase then decrease with the increase of l.
Wear Prediction of Ball Screw Based on Adhesive Wear
Authors: Xu Xiang Hong , Wang Yan Hui , Xu Dong
Published: September 2014

This paper aims to develop a new systematic analysis model to predict the wear of ball screw in stabilization condition. In order to investigate the wear behavior between the ball and raceway, a proper contact mechanics model should be established. Then, the wear model of ball screw based on Archard will be proposed and calculated by substituting the ball screw parameters. It has been proved that the effectiveness of the wear model on ball screw is verified through experiments in a specialized test system, which provides the theory basis of reasonably reducing the wear and improving the mechanical efficiency of a ball screw.
Backtracking Search Optimization Algorithm with Low-Discrepancy Sequences for Mechanical Design Optimization Problems
Authors: Xu Qiu Yan
Published: September 2014

This paper presents the backtracking search optimization algorithm with low-discrepancy sequences to solve mechanical design optimization problems involving problem-specific constraints and many different variables. Similar to other evolutionary algorithms, backtracking search optimization algorithm is sensitive to the initial population. Generally speaking, since there is no information about the optimization problem, the initial population should be created uniformly. The low-discrepancy sequences are employed to increase the uniformity of the initial population. The benchmark problems widely used in the literature of mechanical design optimization are used to evaluate the performance of the presented algorithm. Results show that the proposed algorithm is effective and efficient for solving the mechanical design optimization problems considered.
Characteristic Variable Based Robust Design for Dynamic System
Authors: Lu Xin Jiang , Lv Wen Bing , Zou Wei
Published: September 2014

In this paper, a dynamic robust design method is proposed to achieve a desirable dynamic performance in despite of parameter variation. Since it transforms the robustness of a dynamic system into the robustness of its characteristic variables, the complex dynamic robust design problem becomes a relatively simple static robust design problem. This greatly eases complex of this design. The effectiveness of the proposed method is further demonstrated by a comparison with the existing method on design of a practical hydraulic press machine.
Acoustic Optimization for Intake System of Commercial Bus
Authors: Han Yang , Zhou Hong , Shi Meng Yi , Jin Chang
Published: September 2014

Based on simulation and test, a method for engine acoustical source characteristic extraction and acoustic optimization was presented. The intake noise of engine of commercial bus with four different acoustical loads was measured and the characteristic of the noise was extracted using the four-load method. The values of intake noise calculated by BEM were compared with the values measured in the vehicle intake noise test. The comparison result showed that the simulation values agreed with the experimental ones at most of the range which indicated that the extracted result was reliable. The anechoic frequency was determined by analyzing the intake noise spectrum measured in the vehicle intake noise test. Finally, an effective scheme adding a Helmholtz resonator and a quarter wave tube was proposed by simulation, applied to the real vehicle and verified in the test. The acoustic performance of the intake system was improved significantly.
The Optimization on Grid Division Methods of Blade Pump Blades Based on CFD
Authors: Xue Dang Qin , Lv De Yong , Zhang Jia Xi , Hou Shu Lin
Published: September 2014

Grid division is the geometric expression forms and vectors of CFD numerical simulation engineering problems. The quality of the grid has an important impact on the CFD accuracy and computational efficiency about CFD. In this paper, it compares the structured and non-structured grid process summary base on blade pump. During a large number of mechanical fluid grid division and performance calculations, and combining with the theoretical guidance based on rotating machinery fluid Dynamics calculations, it summarizes some experience and practice on blades grid division optimization.
Reliability Analysis of Automobile Engine Connecting Rod Using Fourier Orthogonal Neural Network Method
Authors: Sha Li Rong , Wang Tong Yu
Published: September 2014

In order to predict the failure probability of a complicated structure, the structural responses usually need to be estimated by a numerical procedure, such as finite element method (FEM). To reduce the computational effort required for reliability analysis, response surface method could be used. However the conventional response surface method is still time consuming especially when the number of random variables is large. In this paper, a Fourier orthogonal neural network (FONN)-based response surface method is adopted to solve the reliability analysis of the automobile engine. The working process of the connecting rod is simulated with UG software, the dynamics analysis on crank-connecting rod-piston mechanism is performed with ANSYS and ADAMS software, with FEM analysis results, the stress information of the critical point of the structure can be obtained, so the performance function of the structure can be established. The FONN method is used to fit the performance function as well as its derivatives, so as to calculate the reliability of the structure.
Application of the Risk Theory to Management Reliability of the Pipeline
Authors: Muravyeva Liudmila , Vatin Nikolai
Published: September 2014

The leak less distant transportation of large amounts of hazardous matters (for example natural gas) through a pressurized pipelines is a serious challenge. The pipeline should be able to withstand the full range of ambient conditions as well as the Earth’s crust movements, varying soil chemical state at present and after months or years of exploitation. During the previous years the formal risk assessments were carried out on the base of the failure intensity. Since that time the procedure of the risk assessment has become more sophisticated. At present risk management is being more and more mandated by regulations.
Analysis of the Smoke Flow in Subway Fire
Authors: Li Xin , Zhan Yao Li
Published: September 2014

Subway is an efficient transportation to alleviate the intensive traffic in modern cities. In the case of fire, it will bring out serious casualties and property losses. This research analysis the accident causes and characteristics in subway fire and flue gas flow analysis of mechanical smoke control track area of fire. The results and conclusions of this research are of great significance and practical value for the subway fire prevention and fighting，and have great reference value to the performance-based fire design in subway fire．
Research on Method to Analyze Reliability of Equipment Based on Fault Information
Authors: Zhang Shi Xin , Zan Xiang , Ye Hong Bin , Tang Wei
Published: September 2014

Based on reliability theory, fault information is used to research the rule of fault and analyze reliability. To disadvantage of normal methods, the method of linear transformation of non-linear regression model to fit distribution to determine the best distribution is proposed. It can solve the problem with normal method is affected by experience and without compare. The result shows the model works effectively.
Efficient NC Tool Path Planning Based on the Subdivision of Sculptured Surface
Authors: Min Li , Bai Biao , Wu Yu Hou , Zhao De Hong
Published: September 2014

In this paper, we have presented a method to generate efficient NC tool paths based on the surface subdivision. The main objective is to achieve high efficiency in the machining of sculptured surface. The NC machining efficiency can be improved by segmenting the whole surface into distinct areas according to the characters of sculptured surface and by using different size mills and different tool path planning methods to machine the areas. The iso-parametric method and large mills are used in the curvature changing little areas. While the iso-scallop method and small mills are used in curvatures changing large areas. This can make full use of tool path generation methods and mills, which improve the machining efficiency of sculpture effectively.
Establishment Method of the Simplified Model for Research on the Crashworthiness of B-Pillar in Side Impact
Authors: Zhuang Wei Min , Xu Qin Hua
Published: September 2014

In order to improve the efficiency of the calculation of the whole car side impact finite element model,simplified model often used in research of B-pillar in passenger car. It is critical to establish a high accuracy simplified model in a short time. The relationship between the energy absorption of body parts and the calculation accuracy of simplified model was analyzed,and the result can be used as a guide for the establishment of simplified model.
Interactive Animation Construction in Virtual Environments
Authors: Cheng Cheng , Lu Bao An , Umwali Marine
Published: September 2014

Current mechanical kinematic animation can’t satisfy the requirements of Virtual Environment (VE) based design. The kinematic animation design in VE development platform does not have high level models and mechanisms, the interactive animation designs and developments are very difficult and time consuming. For these reasons, this paper proposes an innovative method for interactive kinematic animation design and development in VE, including dynamic runtime model and execution algorithm for interactive animation. A complex mechanical kinematic mechanism, that is, the engine assembly, is built to validate the animation technology introduced in this paper.
Heating Coil and Delivery Pipe Design of Asphalt Heating Equipment
Authors: Mao Kun Li
Published: September 2014

Medium pressure water asphalt heating equipment and hot oil asphalt heating equipment widely used in asphalt concrete mixture are using indirect heating method. In indirect asphalt heating device design, heating coil full of heating medium in asphalt tank and asphalt delivery pipe to next technological tank or asphalt concrete mixing device are key parts for the heating technology. Based on heat-transfer mechanism of heating medium, medium pressure water and hot oil have been compared, and medium pressure water has been chosen as heating medium for better character in heat transmission capability and efficiency. By thermo technical calculation, diameter,length and layout of heating coil have been decided, and structure of asphalt delivery pipe has been designed. Equipment running effect shows pipeline of medium pressure water system is designed reasonably and goal temperature of asphalt can be reached.
Numerical Simulation Study on Optimization of Solar Flat-Plate Collector
Authors: Shi Yan Hua , Zhu Liu Juan , Cao Yuan Zhe , Shen Ming Cheng
Published: September 2014

Solar flat-plate collector is an important component in solar-thermal system, and its optimization is critical for the efficiency of energy utilization. In this paper, a comparative study on the thermal performance of solar flat-plate collector was carried out by numerical simulation under the conditions of different thicknesses and materials of absorber plate. The results show that the increase of absorber plate thickness contributes to restraining convection loss. The collector efficiency levels off when the absorber plate thickness reaches a certain value. In considering thermal performance and production cost, aluminum is an optimal material for absorber plate.
Optimization Design for Cooling Channel of the Single Screw Extruder Barrel
Authors: Tang Yue , Li Jin Wei
Published: September 2014

To solve the issue of machine barrel skewed to one side, when the XJ150×25 was running. Under the conditions that the needs of strength was met, by designed three types of cooling channels and analyzed the temperature field for the barrel by using ANSYS, as well as thermal deformation. The results show that cooling channel of center symmetric form can solve the problem that uneven temperature field causing the barrel to produce thermal deformation. It can guarantee the coaxial degree between screw and barrels and can improve the quality of products.
Simulation Analysis of Engine-Oil inside the Clearance between Crankshaft Journal and Bearing Shells in the Ideal Stable Conditions
Authors: Shu Pei , Zhang Hong Xin , Xiao Ru Qin , Shi Jin Zhu
Published: September 2014

For the bush-burning problem in the course of the engine operation. Taking a certain kind of engine as reference, build a 3D geometric model of the engine-oil flow field in the ideal stable conditions with GAMBIT and conduct a simulation of it with FLUENT. It reveals that we can have an intuitive understanding of the flow state and pressure distribution of the engine-oil inside the clearance between the crankshaft main journal and crankshaft bearing as well as the rod journal and rod bearing which provides basis for a further refining of bearing lubrication system, improving the lubrication method and enhancing the efficiency of the lubrication.
The Strength Analysis of the Turbine Blade Based on Finite Element Method Calculation and Optimization
Authors: Ding Yu Feng , Fang Wei , Wang De Gang , Sheng Bu Yun
Published: September 2014

Finite element method is widely used in steam turbine impeller blade subsystem strength analysis aspect, but because of the complicated working environment, the steam turbine has taken different handling of loads and boundary conditions when using finite element analysis method. In this paper, Static strength of the "215mm" of 135 MW steam turbine standard blade was calculated by using traditional calculation method and finite element method. By comparing two kinds of analysis results, the work load and boundary conditions were revised, which ensured the credibility of the result of the finite element analysis; According to the analysis results of stress, concentration phenomenon was obvious, then the blade root was optimized and the optimization result was excellent.