bluuebunny/crossref_metadata_2025 huggingface dataset:
Research and Implementation of Variant Design for Longitudinal Roadheader’s Cutting Unit
Authors: Yang Yi , Hu Ji Quan
Published: November 2012

To support rapid design of longitudinal roadheader’s cutting unit better, an approach for product variant design based on parametric modeling was presented. According to the function and structure of longitudinal roadheader’s cutting unit, this paper partitioned the function modules of cutting unit and analyzed its parametric models by using theory and key technologies of variant design method. On the basis of the existing 3D models, variant design of geometry shape features, main parts and assemblies of longitudinal roadheader’s cutting unit had implemented through re-development on Computer-Aided Design platform. It proves that the variant design method can accelerate product design process, reduce costs for product design and ensure the quality of product design. And the instantiation could be as a reference of similar product’s rapid design.
Research Advance on the Drying Section of Paper Machine
Authors: Chang Zhi Guo , Dong Ji Xian , Yi Jiang Miao
Published: November 2012

The drying section of paper machine is not only the major energy-consuming parts of the papermaking process, but also one of the main bottleneck restricting the speed, yield and paper quality. So the research on the drying section has attracted much attention at home and abroad. In view of the traditional steam dryer shortcomings, this paper first introduces two kinds of improvement measures —— the tubulator bar and the siphon which can improve the efficiency of the traditional steam dryer. With the development of the paper industry, domestic and international research on the new type of paper drying technology has achieved some success. Then, we analyse their working principle and characteristic, and conclude that multi-channel dryer has a broad research and application prospects.
Modeling and Stability Analysis of SiCp/Al Composites Thin-Walled Workpiece in Rotary Ultrasonic Machining
Authors: Wang Ming , Zhou Ming
Published: November 2012

Particle reinforced aluminium matrix composites could be used in manufacturing of aviation thin-walled workpiece due to its excellent performances, but it is hard to be manufactured. Rotary ultrasonic machining (RUM) is very suitable for machining particle reinforced aluminum matrix composites with moderate or high volume fraction. Chatter appears very easily in machining process of thin-walled workpiece and it can seriously reduce the quality of components. Based on the dynamic characteristics of machining process, a stability analytical model is built. It is analyzed that the process stability of a thin-walled workpiece of SiCp/Al composites reinforced with 45% volume fraction, and the stability lobe diagram is plotted by using MATLAB. According to stability analysis results, a machining experiment is conducted and the test results indicate chatter could be prevented effectively by this method.
Dynamic Simulation on Feedwater Heater of Nuclear Power Plant
Authors: Wang Chun Guo , Yu Rui , Zhang Ke Long
Published: November 2012

There is not only the flow of the single-phase fluid but also the mixed-flow of the gas-liquid fluid in the system. So, it is very necessary to study its operational characteristics. In this study, the low pressure heaters (LP heaters) in the feedwater system are simulated. Firstly, the models are built using the simulation software JTopmeret and debugged on the simulation platform SimExec. The results are then compared with the design parameters. Finally, the comparison results are analyzed. The simulation results show that the operation parameters of the simulation models are consistent with the design parameters of the system, which proves that the simulation models of the LP heaters are correct. Thus, the simulation is able to provide guidance for the operation analysis, the equipment optimization and the system debugging of the feedwater system.
Steady-State Load Analysis of a Caterpillar Chassis by Finite Element Method
Authors: Qu Qing Wen , Yu Hong Juan , Wang Shao Qing , Sun Tian Ke , Che Jian Zhuang
Published: November 2012

In this paper, according to the characteristics of caterpillar vehicles, taking the PC200 excavator as a model, a caterpillar chassis model is established using analytical finite element method by the software Analysis. According to the characteristics of operating status, the load distribution of supporting wheels, at horizontal support, across the slopes at 10°, in the state of climbing 30° slopes, is analyzed. Effective support area of any three wheels is analyzed to obtain. The condition of focus circle and vehicle stability is determined. The maximum load of static stability is obtained according to the method of stability of three wheels. The results of calculation provide load support for the strength analysis of caterpillar chassis components and stability analysis, It also provides the supporting data for the structural optimization.
Analysis on Crack Propagation of Roll by the Finite-Element
Authors: Zhao Xue You , Lang Zhi Chao , Mao Chun Feng , Zhang Wei Na
Published: November 2012

Roller is a main tool and consumption parts for steel rolling. With analysis test on the fatigue property of roller, the development incentives of crack propagation were realized, the service life of roller was improved and the cost of Production was reduced in a large extent. Roller is a circular column, which do fixed-axis rotation under combined action of roll pressure, bearing reaction, Support roller reaction force and torsion. The failure types of roll such as flaking, fracture and crack. Simulate and analysis on damage of the roller crack by the fracture mechanics of knowledge and ANSYS, which shown that compressive was large with the ring and axial and compressive was small with the radial direction, so the compressive of radial direction the analysis had little effect on roll surface.
Modeling of Aircraft Composite Parts Using Simulation
Authors: Desa Wan Laailatul Hanim Mat , Kamaruddin Shahrul , Nawawi Mohd Kamal Mohd
Published: November 2012

Simulation is one of the most powerful tools available for decision makers to study, analyze and evaluate any design and operation particularly for complex processes and systems. One of the largest application areas for simulation modelling is the manufacturing systems. As such, it is widely applied in manufacturing as a representation of the industrial operation systems allowing the systems to be observed, learnt and tested in a more holistic manner. This paper is based on a preliminary study that demonstrates the application of computer simulation modelling, which is a branch of Operations Research techniques, as a means to identify bottlenecks in order to determine the ideal operating conditions for large scale aircraft composite parts production plant in Malaysia. The model development of the plant under study was built using Arena software.
Design of Compound Die for Flange Drawing Parts
Authors: Nie Fu Rong , Tian Fei , Gu Zun Zheng
Published: November 2012

At present, the flange drawing part with bottom hole is produced by at least 2 sets of dies and not qualifies for modern manufacture concept. In this paper, a compound die is designed which the flange drawing part can be blanked, drew, punched and trimmed in the same forming-position. The die is made of tow convex and concave dies, one drawing female die, one punching die, one blanking female die and one trimming punch. One of the convex and concave is used to blanking, the blank is drew by drawing female die and the other convex and concave, the punching die is applied to punch the bottom hole, the edge of blank is cut by trimming punch. Beside, the key design points and working process of the compound die were discussed as well.
The Simulation and Study of Buffer Device of Hydraulic Cylinder
Authors: Su Dong Hai , Liu Xue
Published: November 2012

Now, the energy buffer device which seals up part of the oil and makes it into the throttle or the gap outflow to achieve the purpose of the piston’s slowing down at the end of the stroke is widely used. At the same time, the inside pressure produced by the oil of the buffer cavity resists the inertia and other external force to achieve the buffering. The cylindrical ring gap buffer device is analyzed in detail in this paper. The model of hydraulic buffer was built based on the MATLAB/SIMULINK, the dynamic characteristics of the buffer pressure and the buffer velocity were simulated, and the influencing factor of hydraulic buffer was compared and analyzed.
Finite Element Analysis on Convexity for Tapered Roller with Arc-Line Modification Profile
Authors: Zhang Le Yi , Xue Yu Jun , Li Ji Shun , Ma Wei
Published: November 2012

Taking double-row tapered roller bearings of a rail passenger coach as research object, the analysis on convexity for tapered roller bearings has been carried out. The comparison of contact stresses at different convexity values with the ANSYS has been done, the optimal range of convexity value under a certain load has been obtained. The results show that the reasonably design of convexity can avoid or reduce the border contact stress concentration occurred between rollers and inner, outer ring raceways under certain condition. But the approximate theoretic convexity and the results obtained by Finite element analysis have a certain margin of error.
Delay-Dependent Robust Stability Analysis for Uncertain Nonlinear Systems
Authors: Song Jing , Qiu Kun
Published: November 2012

As a popular topic, robust stability for uncertain systems with time delay have been widely studied in various engineering, biological, economical, electronic and dynamical systems, nerve network and so on. Recently, many researchers have paid a lot of attentions on the problem of robust stability for uncertain nonlinear systems with time delay. In this paper, a type of uncertain nonlinear delay systems has been considered in robust stability analysis. A novel robust stability criterion of the system is derived by using Lyapunov method and quadratic stability theory. A new upper bound with high-level infinite small on time delay based on Hariwity matrix and a solvable algebraic Riccati equation is presented. The main results are as follows: Through Lyapunov function and a solvable algebraic Riccati equation, we obtain the criterion of robust stability (exponential stability) for uncertain nonlinear systems with time delay.
A Multi-Point Approach to Airfoil Shape Optimization
Authors: Huang Kai , Meng Zhi Jun , Huang Jun
Published: November 2012

Airfoil design is essential for civil aircraft. A multi-point method is presented in this article to improve the aerodynamic performance of airfoil over a range of the flight envelope. This method combines computational fluid dynamics and numerical optimization. It comprises of three phases: 1) Airfoil shape parameterization method to develop candidate shapes. 2) Flow solver validation to calculate aerodynamic forces. 3) Searching for the optimized airfoil shape using the genetic algorithm. The major limitation of single-point design is the poor off-design performance. By basing the objective on a combination of the drag at three design points, the resulting overall performance can be improved with respect to the single-point result.
A New Method of Complex Logistics Planning Scheduling Based on Super Cubic Path Link Algorithm
Authors: Gao Jian , Long Wei , Li Yan Yan
Published: November 2012

The paper mainly aimed at the complex manufacturing system of high-end special equipment which is multiple and nested.To search and establish a transmitting structure model .The model is about complex logistics operations distribution and it has a reconfigurable organization form. Research a new theory about all-around logistics operations which is cooperative multitasking planning scheduling based on super cubic path dynamic link algorithm. It solve the key theory problem caused by not real-time scheduling for logistics operations dynamic planning and not sensitive conduction for self-response required by the reconfigurable of production organization form in the operation of complex manufacturing system which has a great varietal model varieties and great varietal process sequences
Study of the Transmission System of Spreading Powder Device of Direct Metal Sintering Rapid Prototyping Machine
Authors: Liu Ye , Dang Xin An , Yang Li Jun
Published: November 2012

Direct metal sintering rapid prototyping mechanism is complex, including many kinds of transmission systems. Spreading powder device is important to direct metal sintering rapid prototyping mechanism. Based on grasping the working principle of the device, through the study of spreading powder device of direct metal rapid prototyping machine, grasp the process of spreading powder and the main structure of the device, and fabricate the simple model of the transmission system. In order to determine the necessary condition of how the spreading powder device functions, the dynamic parameters of the transmission system must be calculated, and the operation performance of the stepper motor must be checked. Then the precision and the processing quality of the finished part can be improved.
Numerical Simulation and Studies of Temperature Rise within a High-Pressure Vessel during Refueling
Authors: Shi Cheng Ying , Sun Yin Chao , Sun Yao Hui
Published: November 2012

The refueling process of a high-pressure vessel fixed on the rocket-propelled spacecraft was analyzed by the gas kinetics theories and the thermodynamics of variable mass system. A mathematical model was built up to simulate and analyze the refueling process so as to get rules of the pressure and temperature changes and lay the foundation for the design of the fast refueling control algorithm. During the simulation, the thermodynamic model based on natural convection was adopted to make the simulation close to the actual process. The studies shows that the best way to decrease the temperature of the gas within cylinder during refueling and keep the whole time prolong slightly is increase the heat transfer coefficient of cylinder and decrease the volume of stationary tank within measure.
Modeling and Simulation of the Hydraulic Height Adjustment System of Mobile Tail Based on AMESim
Authors: Guo Yong Cun , Xing Min Jian , Hu Kun
Published: November 2012

Mobile tail is an important part of the telescopic belt conveyor. It relies mainly on the hydraulic system to achieve its various functions, while the hydraulic height adjustment system is the basis of its different functions. So the operational principle of hydraulic height adjustment system of mobile tail was analyzed in this paper. Parameters which may affect the dynamic process were analyzed. Software AMESim was used to model and simulate the dynamic process. The velocity and displacement of piston and the pressure of the hydraulic cylinder were calculated by the software. Different pump flow and different heart diameter of one-way valve were used to analyze their influence on dynamic process, which provide a reference to the optimal design of hydraulic system of mobile tail.
Simulation Study on CMM Measuring Path Based on the CAD Models of Bevel Gear
Authors: Zhang Xiao Bao , Shi Hong Xia , Liu Ning , Zhou Xian Jiang
Published: November 2012

As an important part in sliding-limiting differential, the variable ratio noncircular bevel gears can increase the locking factor of the bevel gear differential and improve the vehicles’ off-road capability in transit. At present, this differential has become a study hotspot that many researchers are working over because of its compact structure, cheap cost, good assembly and perdurable capability. In order to get the bevel gear’s processing accuracy, this paper introduced the generating process of the bevel gear’s CMM measuring path, probed the similarity in motion between spherical cutter’s CNC machining and CMM measuring, and then simulated and analyzed the bevel gear’s CMM measuring path by power mill in use of NC authentication method, which provided a reference for the choice of complex surfaces’ measuring methods.
Dynamic Simulation on Secondary System of Nuclear Power Plant
Authors: Yu Rui , Yao Shi Wei , Wang Chun Guo
Published: November 2012

The secondary system of Qinshan phase I nuclear power plant is simulated in this study. According to the characteristics of the JTopmeret model, the system is divided into six parts for modeling, which are the deaerator, the high pressure (HP) turbine, the low pressure (LP) turbine, the moisture separator reheater (MSR), the condensate system, and the feedwater system. All parts are built as the graphic automatic models in JTopmeret and debugged on the large-scale simulation platform GSE to complete the steady-state and dynamic simulation of the models. The results show that the steady-state and dynamic processes of the models are consistent with the characteristics of the actual system. It verifies the correctness of the simulation models. Thus, this research is able to provide guidance for the operation analysis and the equipment debugging of the secondary system of the nuclear power plant.
The Research of Cognitive Load in the Virtual Maintenance Training
Authors: Yu Chang , Liu Wei , Yang Guang
Published: November 2012

The aim of this paper is to study cognitive load in the virtual maintenance training. This paper first introduces the concept of virtual maintenance training, looks back the study history of actuality and sketches the current development in the virtual maintenance training. And then, it studies cognitive load in the virtual maintenance training. In this part, this paper talks about the impact of cognitive load on the virtual maintenance training and analyzes the sources of cognitive load and the strategy to reduce cognitive load. At the same time, it points out the measurement methods for the cognitive load in the virtual maintenance training. In the last part, the research foreground for cognitive load in the virtual maintenance training is proposed.
Application of Virtual Prototyping Technology on Kinematical Simulation of Baler Compression Device
Authors: Zheng Xue Fei , Li Bi Wen , Zhang Ying
Published: November 2012

Compression device is the important mechanism of baler. This paper uses the virtual prototyping technology. It analyzes the function of compression device in 9KG-350 high density baler and the three-dimensional digital model of compression device is obtained based on UG package .Then the model is put into ADAMS, and a kinematical simulation analysis is performed. Through the simulation, the whole kinematical process is reflected, gaining the relative kinematical curves of compression device as well. The results can be help in study the design of baler and the structure optimization.
Effect of Pin-Fin Heat Sink Structure and Irradiation Angle on High-Power LED Down-Light Thermal Performance
Authors: Liu Hai Lin , Wu Li Gang , Dai Shi Xun , Lin Wan Jiong , Zhou Bo You , Jin Xiao Ming
Published: November 2012

The heat sink has played an important role in the thermal design of high power LED lamps. In this study, a pin-fin heat sink is designed for the 3-chips high power LED down-light. Thermal performance of pin-fin heat sink is researched by changing the fin height, fin number and lamp’s irradiation angle. Simulation results gotten by CFD software show that the pin-fin heat sink has better thermal performance with fin height of 40mm and fin number of 75. The LED down-light with a pin-fin heat sink has a better cooling effect in multi-angle irradiation. The results provide a reference for future design of pin-fin heat-sink.
The Research on the Movement Precision of Globoidal Cam Mechanism Based on Error Modeling
Authors: Yang Shi Ping , Zou Ying , Tan Yuan Qiang , Liu Jang Gang
Published: November 2012

Through analyzing several common errors that have impact on the kinematic accuracy of globoidal cam mechanism, finally a mathematical model of globoidal cam impinged with error was established. By using the differential method, the motion accuracy influence coefficients of the globoid cam mechanism were obtained. The change rule of kinematic accuracy influence coefficient with the change of globoidal cam rotation angle was analysed with practical cases. The analysis result shows: different error factors lead to different influence coefficient; Radius error of the index disc roll has the greatest impact on motion precision, while shaft angle error almost has no influence on the movement precision; The meshing position of the globoidal cam mechanism affects the kinematic accuracy volatile; Moreover, each motion accuracy influence coefficient has a certain relationship with the structure factors of globoidal cam.
The Research on Motion Reliability Simulation of Planar Linkage Mechanism
Authors: Wan Chao Yan , Li Wen Cheng , Zhao Xu
Published: November 2012

Taking planar pivot four-bar mechanism for example, the method motion reliability simulation on solving motion reliability of planar linkage mechanism is proposed in this paper. Under the circumstances that manufacturing errors and joint clearances are normal distribution, ADAMS is taken as the analysis platform and the parameterized model of planar linkage mechanism is established by it, then Monte Carlo theory is used to calculate in order that different random simulation model can be obtained. After cycle simulation, the data of simulation will be saved in text files so that it could be used for calculating the result of motion reliability. This method is applied to solving motion reliability of the opening/closing mechanism of the bottom door in the coal hopper, and the result is reasonable, thereby its effectiveness is proved successfully.
Analysis and Design of the Reliability of a Wire Setting System
Authors: Hong Li , Zhang He , Fan Qing Tian
Published: November 2012

Reliability as an important index occupies an important position in electronic time fuze design. Small and medium caliber ammunition could be set in wire form or wireless form. Wireless setting can be divided into several forms, electromagnetism induction setting, radio frequency setting, laser setting and so on. There are many existing disadvantages in this technique, such as weak EMI ability, complex structure and poor reliability, while wire setting has the advantages opposite them. A wire setting system for electronic time fuse was designed in this article. In allusion to the problems of low ammunition reliability in the experiment, a method that could detect the working condition of the fuze effectively is presented, and bring a great help for finding out the root of the poor reliability. The experimental results showed that the effective rate of the improved electronic time fuze reached 100% and timing accuracy reached +-3 ms. This study provides a reference for the design of the reliability of setting system.
Research on Model Reconstruction and NC Machining for Blade Based on Reverse Engineering
Authors: Zhou Yu Qing
Published: November 2012

CAD/CAM techniques together with NC machining allow to reduce products manufacturing time and costs. The aim of this paper is to present a brief overview of reverse engineering as a necessary phase which provides benefits to the design and production processes in advance. Taking blades as object of study, one method is proposed to improve the design efficiency for blades model reconstruction and NC machining. The process consists of three main components: 3D optical digitizing, model reconstruction and NC machining. First of all, point cloud data acquisition is made through camera type 3D scanner, and the data pre-processing is made by Geomagic software, then it is imported in CATIA software for model reconstruction and generating NC code. Results show that this method can improve the efficiency of blades model reconstruction.
Design and Kinematics Analysis of a New Two DOF Tilter
Authors: Wang Hai Dong , Yang Bing Heng , Zhang Kai , Bi Yu Quan
Published: November 2012

According to the configuration theory of the parallel manipulator with a few degree of freedom (DOF), the paper adopted 2PSU-U mechanism to design a new parallel tilter with 2 DOF, which has such advantages as strong bearing capacity, high precision and kinematic decoupling. It used the coordinate transformation to establish the position and velocity equations of the tilter, and also used the instance to make kinematic simulation, whose result indicated that the roll and pitch angle of the moving platform can vary according to the set motion law by driving two sliders of the main moving branched chains.
Inverse Attitude Solution Model and Numerical Simulation of a 2-DOF Stabilized Platform
Authors: Li Ke Xiang , Zhang He
Published: November 2012

Considering the attitude stabilization requirements for an unmanned marine platform equipped with electro-optic detection equipment, a stabilized platform based on a 2-DOF parallel mechanism has been designed. The stabilized platform, especially for the requirements of small space and high load inertia, has such transmission branch chain with fixed ball-screw. The structure, DOF and kinematics of the platform has been analyzed, besides, the mathematical model of the platform's attitude inverse solution has been established. Numerical simulation for the derivate mathematical model and ADAMS simulation analysis has been done. In order to verify the correctness of the mathematical model, the motion process of the load-platform is described by a time function. The time function of the drive components calculated from the above two ways is used for the comparison of numerical simulation and ADAMS simulation. The results prove that the mathematical model established in this paper and ADAMS simulation results coincide.
The Optimization of Co-Dependent and Absolutely Additive System
Authors: Zhou Xiao Ping , Guo Kai Zhong
Published: November 2012

Based on the additives of system function, and the co-dependence between the system and subsystems. We analyzed the optimization of co-dependent and absolutely additive system followed after the paper The optimization of independent and absolutely additive system. We make further efforts to analyze the performance function of absolutely additive system, the variation of co-dependent and absolutely additive system performance function, and building the optimization model of co-dependent and absolutely additive system based on the performance function, and giving an example.
The Optimized Iterative Projection Method to Determine the Width of an Arbitrary 3D Object
Authors: Zhou Min , Zheng Guo Lei
Published: November 2012

The problem to determine the width of a 3D object is involved in many engineering fields. This paper presents an optimized iterative projection method to solve this problem. In this way, the 3D width problem is turned into a 2D width problem, simplifying the solving process greatly. Furthermore, several improving strategies are addressed to reduce the amount of calculation and enhance the executing efficiency of the iterative projection approach. Experiments of models and point sets are also given to show the prominent performance of the proposed algorithm.
The Multi-Objective Optimization for Cycloidal Gear Drive Based on the Elastohydrodynamic Lubrication Theory
Authors: Qian Xue Yi
Published: November 2012

For improving the designed quality of the cycloidal gear planetary drive, the paper derives a calculation formula of the minimum film thickness, which is between cycloidal gear teeth, based on elastohydrodynamic lubrication theory and gear geometry. A mathematical model for constrained multi-objective optimization is established and the model satisfies three constrains:maximize minimum film thickness between gear teeth( minimize the reciprocal ), minimize average value of m points’s absolute error value on active section that is between the tooth curves of positive shift optimal combination and tooth curves of rotated angle’s modification, minimize the total volume of gear drive. The paper abandons traditional designed method of the multi-objective optimization , improves two-objective particle swarm optimization and offers a new designed model for constrained three-objective optimization. The example is analyzed and the optimization program is complied using Matlab. The optimization’s process and result shows that the method of improved constrained multi-objective particle swarm optimization could effectively improve the products’ synthesize economical and technical indexes.
Implementation of Decision Tree for Maintenance Policy Decision Making - A Case Study in Semiconductor Industry
Authors: Ding Siew Hong , Goh Teing Tien , Tan Pei Sze , Wee Siew Ching , Kamaruddin Shahrul
Published: November 2012

Suitable maintenance policy implemented in particular machine able to improve the machine performance as well as the product quality. However, selecting a suitable maintenance policy is a vital and hard work because it has to be decided from analysis of various criteria including failure mechanism and resources limitation. Thus, decision tree is suggested in this paper to provide assistance for maintenance crew in conducting a systematic and efficient decision making process in determining the suitable maintenance policy. In the end of the paper, a case study in semiconductor industry is conducted to illustrate the practicability of developed decision tree.
Implementation of Autonomous Maintenance in Semiconductor Industry: A Case Study
Authors: Ab-Samat Hasnida , Khoe Poh Guat , Liau Wai Shan , Tan Hsu Fen , Yap Wan Yee , Kamaruddin Shahrul
Published: November 2012

Maintenance is a vital component in ensuring machines to run smoothly. While, maintenance technicians are responsible in conserving the conditions of machine by performing regular inspections. This study was conducted to investigate the performance of maintenance system in a company by identifying the critical machine with the highest breakdown frequency and time. It was found that high breakdown was due to the high workload of technicians, where no extra time can be allocated for thorough inspection task. Technicians do not have enough support in performing maintenance task. In this paper, Autonomous Maintenance (AM) program is suggested to reduce technicians’ workload through operators’ involvement. Technicians work is reduced with the aid of operators, which gives them more time for other maintenance tasks. The AM process flow is implemented in a case study company as a verification and validation processes.
Analysis of Climbing Obstacle Capability and its Influential Factors of Omni-Directional Wheeled Robot
Authors: Li Ai Cheng , Tang Huo Hong , Feng Bao Lin , Li Lu
Published: November 2012

The perpendicular climbing obstacle capability of omni-directional wheeled robot was studied, based on simplified mechanics model. The relation between influential factors and perpendicular climbing obstacle height was given under two conditions: simultaneously climbing obstacle by two front wheels and simultaneously climbing obstacle by two rear wheels. Then maximum perpendicular climbing obstacle height of this omni-directional wheeled robot was calculated. Simulation analysis to the result by MATLAB was done. The simulation analysis gave theoretical foundation to the climbing obstacle capability of omni-directional wheeled robot.
Finite Element Analysis of Top Flanged Joint System of High Power Level Wind Turbine
Authors: Zhang Rong
Published: November 2012

This paper uses non-linear finite element method to structurally analyze top flanged joint system of a MW wind turbine, sets up a finite element model of top flanged joint system by applying finite element analysis software MSC.Marc/Mentat, makes an analysis on the stress distribution of key components of top flanged joint system under ultimate operating mode based on applying appropriate boundary condition and loads, and carries out security examination on top flange and joint bolt. Result shows that key components of the top flanged joint system can satisfy design requirements, and it has a guiding role for rational design and performance improvement of large scale wind turbine flange, which can be used in structural analysis of other flanged joint systems, and has certain practical value in the aspect of engineering.
Optimization of Vehicle Handing and Stability Based on RSM
Authors: Sun Dong Shan , Wang Fang , He Yan Pin
Published: November 2012

Based on the theory of multi-body system dynamics and simulation software ADAMS/Car, the whole vehicle model was established. Afterwards by means of pylon course slalom, the accuracy of modeling was tested. The analysis and evaluation were later made to draw a conclusion that the handling stability of model needed improved. So as to improve the handling stability, the index lateral acceleration, yaw rate, side slip angle were taken as target function while suspension stiffness parameters were designed variables. Optimization of vehicle handing stability was practiced by applying second-order Response Surface Methodology (RSM) model. The relationship could be obtained by least square method obviously. Moreover applying with linear interpolation the final objective function was decided. The minimum of final objective function was the optimal result. Simulation analysis was performed again for the whole vehicle model by parameters modification. Subsequently, the results showed that this method greatly improved handling stability.
Analysis of Support Reliability of Missile System Based on Neural Network
Authors: Li Tao , Pan Wen Geng , Chen Li , Ma Xiao Xiao
Published: November 2012

Support reliability of missile weaponry is very important for its fighting capacity’s forming. The missile support process was first studied. Then based on the analysis of influence factors of human reliability, neural network structure of missile support reliability was presented with the aid of neural network’s theory and methods. With case study, the relation between human reliability’s influence factors and support reliability. It can provide management information and technology plan for evaluating support personal reliability, personal selecting and training.
Dexterity Analysis of 6-dof 3-urps Parallel Mechanism
Authors: Yun Hong Li , Song Xiao Na
Published: November 2012

The kinematics analysis is carried out on a kind of 3-urps parallel mechanism (pm) with 6-dof. The positional inverse solution and Jacobean matrixes which is used to analyze the dexterity of mechanism are derived. Condition number is used as evaluating indicator of dexterity in this article, and its’ three-dimensional graphs are drawn when this mechanism in different attitudes. It is indicated that dexterity of moving is excelled than the rotary movement’s for this pm. The optimum dexterity can be obtained in the center of mechanism’s workroom, which can be applied to further characteristic analysis and kinematic design of mechanisms.
A Method to Calculate Tool Accessible Domain Based on the Point Model for the Multi-Axis CNC Machining
Authors: Chen Bing , Liu Kai , Gao Qiu Shi
Published: November 2012

This paper puts forward a kind of method which can calculate tool accessible domain for tool axis optimization in the complex curved surface multi-axis machining. At first , the point model has been construced on the base of constrained surface.The second, based on any possible direction of tool axis vector of a given cutting contact point, the distance between a point and a line is used to decide whether occurs collision and interfence. The third, two angles related with cutter-axes vector is definied. The regulation of tool accessible domain can be implemented by getting the boundary of the discrete points in the coordinate planes. Finally, a tool has been developed to calculate tool accessible domain, and an example is given to verify the effectiveness of the method.
Modeling and Enhancement of Mckibben Pneumatic Muscle Actuators
Authors: Zuo He , Tao Guo Liang , Zhu Xiao Cong
Published: November 2012

Mckibben pneumatic muscle actuators (PMA) have many advantages such as high power-mass ratio and low price, but their strong nonlinear characteristics makes modeling and controlling very hard, which limits their applications. This paper presents the modeling of PMA and methods to enhance their dynamic performances. Considering the incorporated models of fast-switching valves and PMAs, the entire system model is modified in some aspects and the dominant model parameters are determined through experimental results to estimate the dynamic characteristics precisely. Simulation and proper experiments reveal that the dynamic performance of PMA can be improved through filling the PMA with materials of high thermal conductivity. The slow time-varying disturbance caused by the temperature variation of inner gas can be reduced much, which lowers the difficulty of controlling.
The GREEN Design of Horizontal Type Transfer Machine for Underground Coal Mine Belt Department
Authors: Mao Ping Huai , Li Jing Xi , Ding Li
Published: November 2012

The Horizontal Type Transfer Machine for Underground Coal Mine has a simple controlling surface, compact structure and the low cost of making. It also could continuous loading of small underground loader. The paper mainly presents that the design of horizontal type transfer machine for underground coal mine belt department. It points out the structure and working principle of Transfer Machine and that also provide theoretical and technical support for the transfer machine’s continuous operation. This article multi-disciplinary considers the manufacturing technology, structural optimization and the economic running. It also consider of the machine’s reduce, reuse and recycle.
Simulation of Laser-Induced Asymmetric Bubble with Lattice Boltzmann Method
Authors: Deng Yu , Guo Zhong Ning , Huang Zhi Gang
Published: November 2012

In this paper, the Lattice Boltzmann Method is applied to set up the numerical model of cavitations. The surface of the part is introduced into the symmetric bubble model to form the more realistic model called asymmetric bubble. With the help of simulation, no pulsation is detected but it is noticed that the pressure is no longer present uniform distribution for the four virtual surfaces symmetrically set around the bubble. The pressure close to the part’s surface is slightly higher and the velocity gradient is larger than those further away from the solid surface. And the distortion along the flow line is discovered at the end of the solid surface. The asymmetric bubble collapses in a complicated way thanks to the various velocities in different point of the bubble wall. What is more, a micro jet with radius of 10μm is generated which leads to the sharp reduction of momentum of the wall and the increase of the pressure near the bubble wall. According to the simulation, the impact on the work piece peaks at 1.6GPa.
CNC Programming for 2D Image
Authors: Zhang Hai Yun , Zhao Yu Gang , Sima Zhong Wen , Li Yan Rong
Published: November 2012

Many parts such as craftworks and hand draw pictures were manufactured based on the image. Their shape was irregular and couldn't measure accurately. And the dimension was not labeled definitely. So the CNC machining code couldn't directly generate. The paper studied the methods and the machining performance of this kind of part. The digital image could be obtained through the scanner or the digital camera, and pretreated by computer. The digital images were transferred into the vector document and the boundary dimension parameters could be gotten. The NC instruction was generated through the automatic module. Finally the procedure of programming and process was verified by an image
Modeling Developable Mesh Surface by Lofting
Authors: Chen Ming , Yu Hua Kun
Published: November 2012

In the metal building and garment industries, product model is required to be or closed to be developable surface (can be flattened onto planar patterns without any distortion, tear or stretch).Current work mainly focuses on interpolating only two curves with a narrow developable strip, and lose the generality of applications in industries, which often require N (N>2) curves to determine the final shape feature, and seek one interpolated developable surface. In this paper, a new developability degree criterion is introduced first and a novel lofting algorithm is proposed to model a quasi-developable mesh surface for the given characteristic curves. The curves are first adaptively sampled and then planar triangles are tiled to interpolate all sampling points. The optimal triangulation in terms of given criterion is mapped as one shortest-path finding graph problem, which can be solved by using well-known Dijkstra’s algorithm.
Thermal Analysis of a Ball-Screw System
Authors: Wei Chin Chung , Horng Jeng Haur , Lin Jen Fin
Published: November 2012

High speed ball-screw system has serious friction heat to form thermal expansion to each component. An analyzing model considering with contact deformation and thermal expansion is established in realizing positioning error for a high speed ball-screw system. A finite element model of nut is also built in calculating elongation of nut. Surface strain of nut is measured by strain gages in order to confirm with data obtained from finite element model. Temperature of nut and screw were also measured by thermal couples and are used in calculation of elongation by the use of linear elongation equation. The tendency of positioning error is well estimated by the analyzing model. The model can be used in feedback positioning control factor and develop precision high speed ball-screw system.
An Obstacle Avoidance Method Based on Distance Fields in C-Space for Virtual Arm
Authors: Jia Jin Wei , Yu Jian Feng , Zhang Jie
Published: November 2012

Collision detection is widely used in human motion simulation, however, it is difficult to work in large equipment model. To overcome the problem, this paper studies a collision detection method especially for virtual arm simulation. First, the method simplifies arm and obstacles in its reaching space with the C-space theory, and divides the space into small unit cells to form a distance fields, then extends the surfaces of obstacles to calculate the distances between each cell and its nearest obstacles, so the result of collision detection is depending on the distance fields’ value. Use CAA to redevelop DELMIA and apply it to the virtual assembly simulation of a certain type of aircraft center wing, compared with triangle intersection algorithm and mixed bounding box method, the result shows that the proposed method improves the efficiency of anthropology ergonomics simulation by more than 20% in the same condition.
Unified Product Information Modeling Using Model-Based Definition Technology
Authors: Han Juan , Zhang Fa Ping , Gao Bo , Zhang Jing , He Yun
Published: November 2012

It is a common phenomenon that 3D model and 2D engineering drawings are widely used together in modern manufacturing scenario. Therefore it makes a lot of extra tasks to do for both of them which lead to such results as high time consuming, labor intensive during the process. The Model-based Definition (MBD) approach is definitely an effective method to solve above problems. To facility the usage of the MBD Technology, this paper introduces two kinds of MBD model (design-MBD, process-MBD), and describes their contents as well. The paper also focuses on constructing the dMBD model and pMBD model from two aspects: information organization and annotation standard so that these models can guide production more effective.
Ladle Transportation Car Frame Finite Element Analysis
Authors: Tang Ping , Pan Chun Hua
Published: November 2012

Using the mechanical design of the software Solid works to established the 280 t LF the ladle furnace transportation car frame three dimensional model, and by using the finite element analysis of software Cosmos/works to static analysis for the frames, revealing that the frame of structure stress and strain distribution map of the frame, and also reveals that dangerous points and dangerous sections. Using resistance strain gauge to measure 280 t ladle transportation car frame, it is concluded that the frame of stress and strain distributions. Through the electrical measurement test the results were compared with finite element analysis results, further proof that the finite element analysis of the accuracy of the results provides theory basis for the optimization design of the frames.
Research on the Wire Drawing Die Pass Parameter Calculation Based on the Least Square Algorithm
Authors: Wen Huai Xing , Yang Yong Tao
Published: November 2012

Drawing Dies meter A / D acquisition module will be collected from the mold hole contour data to draw a curve in Matlab. According to the mold pore structure characteristics of the curve, the initial cut-off point of each part of contour is determined and iteratived optimization to find the best cut-off point, use the least squares method for fitting piecewise linear and fitting optimization to find the function of the various parts of the curve function, finally calculate the pass parameters of drawing mode. Parameters obtained compare with the standard mold, both of errors are relatively small that prove the correctness of the algorithm. Also a complete algorithm flow of pass parameters is designed, it can fast and accurately measure the wire drawing die hole parameters.
Application Research of Data Warehouse in CRM
Authors: Ou Yan Qun , Zhou Li , Fang Yu Ping
Published: November 2012

Customer relationship management (CRM) is an integral part in the manufacturing enterprise information. The content of CRM is based on customer information and business transaction data, and using computer information technology to deeply analysis massive data of data warehouse. The purpose is to identify customers’ different features and analyze customer behaviors, then dig out the information of commercial value to help business planning and decision-making related business activities. The thesis introduces the system of the CRM based on Data Warehouse: to describe and predict the model of enterprise customers’ behavior by data warehouse and data mining theory and technology. The purpose is to optimize the entire CRM process, and effectively realize customer relationship management ultimately. Research and analysis of data warehouse in CRM to achieve other functions such as customer behavior analysis, key customers found and market performance evaluation. It can further analyze amounts of customer information in data warehouse, acquire efficient information about how to enhance the advantages of market competition, make the concept and goal of CRM can be achieved and satisfy the demand and challenge in modern e-commerce times. It can help enterprises increase market decision-making ability, gain competitive advantages and perfect business plan.
The Design of Heart Sounds and Electrocardiogram Monitor System Based Atmega64
Authors: Yao Qing Hua , Cao Miao
Published: November 2012

The paper introduces a system. It can not only acquire and process heart sounds and electrocardiogram(ECG) of the human body timely but also store and display. It is composed of superior microprocessor--Atmega64,large capacity flash and the new type LCD. All hardwares adopt low power design and surface mounting package. The advantage of the system is compact and high intelligence. The system software applies mold construction and programs in C language. A model for automatic arithmetic is established for the feature extraction of ECG, realtime cardiotach ambulatory analysis is realized. The system is capable of recording ECG and heart sounds information in succession for 48 hours and it stores the no compression data synchronously. More than ten types of familiar heart diseases can be diagnosed in time by it automatically. The testing data achieved from this system is dependable, the diagnosing result is accurate and the waveform is no distortion. The system do not affect the daily living and working when it is used, so it is suited for clinical and family monitoring.