bluuebunny/crossref_metadata_2025 huggingface dataset:
A Study of the Microstructure and Grain Size at the Welding Heat Affected Zone of an Industrial Pure Aluminum
Authors: Zhang Shi Xing , Cai Gang Yi
Published: March 2010

In this paper, Monte Carlo (MC) technology with welding experiments and thermal simulation experiments were introduced to simulate the grain growth process in welding heat affected zone(HAZ) of 1060 industrial pure aluminum. First, a kinetic model was defined by both experimental and statistics method. Then the thermal cycle was calculated and at the same time the simulation program was worked out based on MC technology. Thirdly, the grain growth process in HAZ was simulated during different welding heat input, which has great influence on grain growth in HAZ. The result of the simulation demonstrates the grain growth process dynamically and embodies the “thermal pin effect”. Good agreement between MC simulation results and the experimental results was obtained which can provide a reliable evidence for evaluating the welding craft and the weldability.
Investigation of Fixture Design Exploring Pre-Tensioning Forces
Authors: He Jia Yuan , Wang Yan , Gindy Nabil
Published: March 2010

Pre-tensioning forces are, in essence, the selective application of clamping forces applied prior to processess to create a “stress field” envelope that aids the processes of components. There are many potential functions of applying pre-tensioning forces, such as improvement of component rigidity, reduction of machining deflection, and holding of components to counteract the machining forces etc. However, the use of pre-tensioning forces has not been extensively and comprehensively investigated. The aim of this paper is to strengthen the understanding of the impact of applying pre-tensioning forces firstly on simple parts and specifically on the fixture design development by establishing a methodology of using pre-tensioning forces. To investigate the optimised fixture layout and clamping strategy, Finite Element Analyses (FEA) were established to show the effect of applying pre-tensioning forces on machining deflection. Meanwhile, the relevant model validation experiments were applied to verify the FEA models in this study appropriately. Eventually, the results show that the FEA simulations are sufficient and the use of pre-tensioning forces effectively reduces the machining deflection by using optimised clamping strategy.
A 3D Nonlinear Finite Element Study on Biomechanical Behavior of Dental Implants
Authors: Wu Ting , Liao Wen He , Dai Ning
Published: March 2010

In this paper biomechanical behavior of dental implant and surrounding bone system are investigated under static occlusal loads through 3D nonlinear finite element analysis (FEA), taking into account the interaction of implant-bone and implant-abutment contact interfaces. Stress-based performances of four commercially-available dental implant systems are evaluated in detail, demonstrating that implant and bone stability is strongly affected by implant-abutment connection structure as well as by a number of geometrical parameters. The results also indicate that platform-switching configuration can significantly reduce the crestal bone stress peaks, which contributes to the bone preservation for long-term success.
Deformation of Seat Support during Free-Cooling after Ejection
Authors: Wen Tong , Chen Xia
Published: March 2010

The deformation of an injection-molded part of a motorcycle seat support during the free-cooling stage after ejection was studied by an experimental and numerical method. Numerical analysis of heat transfer based on the uneven temperature distribution measured in the seat support was employed to re-construct the initial temperature field of the part. The temperature field was then introduced into the FEM codes to calculate the deformation of the ejected part due to thermal-stress during the free-cooling stage. It was found that the high and uneven temperature distribution of the part leads to an uneven shrinkage during cooling after ejection, which is primarily responsible for the warpage of the part.
An Optimization Analysis of Prestressed Space Grid Structures Based on System Reliability
Authors: Zhang Chun Yu , Wang Zhen Qing , Qiao Mu
Published: March 2010

The system reliability of prestressed space grid structures were using as control parameters. Branch-bound method was used to determine main failure modes. The reliability of system was calculated by PNET method. Improved genetic algorithm was used in the minimum weight optimum design of the structure system under reliability constraint. Using this method, the complex sensitivity analysis of structural systems could be avoided and made optimum design of the structure system easy. The result of an example showed that the effectiveness of the method.
Study on Boosting Curve for Electric Power Steering System Based on ADAMS
Authors: Chen Hao , Yang Ya Li , Chen Li Hua
Published: March 2010

Electric Power Steering (EPS) is a full electric system, which reduces the amount of steering effort by directly applying the output from an electric motor to the steering system. This research aims at developing EPS boost curve embody into the assist characteristics, improving steer portability and stability. A model for the EPS system has been established, including full vehicle mechanical system, EPS mechanical system, and EPS electric control system. Based on this model, a straight line boost curve was designed and evaluated in this environment to improve the performance of EPS system. Results showed that EPS system with the designed boost curve improved light steering feeling and increased vehicle’s steering stability, and can meet the requirements of steering performance.
Combining AST and Lock Techniques to Maintain Consistency of Multiple Objects in Replicated CAD Environments
Authors: Gao Li Ping , Ding Yue Wei
Published: March 2010

This paper introduces combining address space transformation strategy with lock strategy to maintain the consistency of both simple objects and complex objects in replicated CAD environments. This combination adapts AST strategy from group editor field to CAD environment, gurantees the high concurrency of the replicated architure, and provides relatively effective strategy to process complex objects. The combination process of AST and Lock strategy is also decribed in detail in the paper.
Study on Injection Mold Rapid Design System Based on Parametric Technology
Authors: Zhang Sheng Fang , Xia Ming Yuan , Sha Zhi Hua , Guo Ting Ni
Published: March 2010

With its broad application field, the injection mold has an important position in the mold industry. The key technologies of injection mold parametric design are studied deeply in this paper, and the injection mold rapid design system is developed finally. The rapid design system has friendly and convenient human-machine interface, can improve the design efficiency of injection mold greatly.
Temperature Effects of ECAP and Annealing after ECAP on Microstructure of TA15 Alloy
Authors: Zhao Yan , Guo Hong Zhen , Shi Zhi Feng , Zhang Yong Qiang , Wang Tao , Yao Ze Kun , Zhang Rui Di
Published: March 2010

A study was conducted by optical microscope (OM) and transmission electron microscope (TEM) on the microstructure evolution of TA15 alloy by severe plastic deformation (SPD) and annealing after SPD. In this study, equal channel angular pressing (ECAP) was taken as the method of SPD. The chief aim of the present work is to investigate the temperature effects of ECAP and annealing after ECAP on microstructure of TA15 alloy. The results indicate that equiaxed microstructure has been obtained by ECAP at the temperatures of α+β phase region, and that with the increase in pressing temperature, equiaxed grains have become coarser and the content of α phase has reduced. β grains have been coarsened severely since the pressing temperature was above the α-β transformation temperature (Tβ). Annealed at proper temperature after ECAP, the α phase of TA15 alloy has been more homogeneous, prior α phase has been well globularized, and grains have not grown obviously. According to the testing of TA15 alloy, the optimized temperature parameters of ECAP and annealing after ECAP are 900°C and 700°C. Observation and Analysis of the TEM morphological images illustrate that a quantity of twinning deformations have been produced by ECAP at the temperatures below Tβ, which leads to the continued plastic deformation through the restarting of many slip bands.
4Ps Framework of Tooling Development and Management
Authors: Zhou Yong Quan , Miao Miao , Zhu Fang Lai
Published: March 2010

4Ps (Proof of concept, Product development, Production, Product Retirement) framework of tooling development and management processes has been established to improve tooling design and manufacture workflow, communication, quality, OTD(On-Time Delivery). A creation of a scalable and flexible best-of-breed workflow from proof of concept phase to production retirement phase has been introduced and strongly supported the needs of each development team of tooling project. The creation and standardization of 4Ps framework have clearly identified and explored the activities, responsibilities and deliverables of tooling project team, throughout the tooling life cycle. Some toolmakers of famous IT companies have benefited considerably by applying these processes.
KBCADFW: A Knowledge-Based Collaborative Computer-Aided Design Framework
Authors: Xu Xiang Bin , Zhou Xin Jian
Published: March 2010

KBCADFW is a collaborative designing platform which integrates CAD/PDM/KM, it manages the product designing resources such as documents, data, knowledge, designing flow etc, KBCADFW uses workflow management system as it’s integration tool to make CAD/PDM/KM working together, it defines product designing knowledge structure and knowledge reasoning algorithm, also defines data exchange format and application integration interface among designing resources, realizing distributed designing resources sharing and application integration. As an knowledge-based product designing platform, KBCADFW solves the key problem in knowledge-based product designing ,such as designing process definition, product designing knowledge expression, knowledge extraction, designing data exchange and application integration etc.
A Multi Autonomic Objects Flexible Workflow and its Knowledge Acquisition Supporting Engineering Design Process
Authors: Wang Dong Bo , Yan Xiu Tian , Guo Ning Sheng , Li Tao
Published: March 2010

In order to support the dynamic and creative Engineering Design Process (EDP) comprehensively, after a detailed literature review, a multi autonomic objects (AO) flexible workflow is applied into the supporting and management of EDP, its support for decision making, EDP evolution and design activity granularity is explained, finally and most importantly, a genetic algorithm-based AO knowledge learning method is proposed, the algorithm is demonstrated by a MATLAB simulation that it can satisfy the knowledge acquisition in EDP satisfactorily.
Design of a Horizontal Moving Mechanism for High-Speed & High-Acceleration Stackers
Authors: Sun Jun , Li Jing , Song Jun , Feng Wu Tian
Published: March 2010

In order to improve the horizontal moving acceleration of stackers, the paper proposes a horizontal moving mechanism called "side-wheel operating simultaneously" and presents the calculating method of its main parameters. The FEM model of improved stacker’s rail system is established by using software ANSYS and the analyzing results show that the design meets the requirement of high-speed & high-acceleration for stackers.
Mechanics Design of Connecting Frame in Aircraft Composite Cabin
Authors: Zhang Jian Yu , Liu Feng Rui , Zhao Li Bin
Published: March 2010

The mechanics behaviour of connecting frame in aircraft composite cabin under static load can be expatiated through its dangerous key components. Initial damage and ultimate strength of the key component are studied using progressive damage method. Based on the strength prediction technique, the effects of composites ply angle and the structural layout on structural initial damage and ultimate failure are discussed to exploit the potential composite structural load carry ability. The numerical results show the ply angle modification can provide 26.3% increase on initial failure stress and 14.1% on ultimate strength. Farther structural layout adjustment can significantly increase the ultimate strength whereas go against the initial failure strength. The design scheme with concave boxes to cope with assembly demands is verified to be practical in joint structures by comparing with a connecting frame without concave boxes.
Virtual Prototyping and Validation of an Automatic Washing Machine
Authors: Fu Su Fang , Gao Han , Zhang Qiu Ju , Chen Xi Qu , Zhang Xue Ming
Published: March 2010

An automatic washing machine vibrates with lager amplitudes and noise during the spin-dry cycle, which affects human health and machine reliability. In this paper, we are interested in the study of the dynamic performance of a drum washing machine, with springs top-mounted and dampers bottom-mounted. A novel model for simulation of the dynamic performance of the drum washing machine was developed under MSC.ADAMS software package. Next, simulations and validations were performed. The simulation results indicated good agreement with the mechanical performance of the actual test system, which demonstrated the validity of the dynamic model to predict the displacements of the tub center during the spin-dry cycle. Moreover, the developed model was capable of successfully simulating drum washer operating test for various dynamic responses of the given parts by building Measures or using Markers at the transient or steady-state, which could afford better support for designers to explore the robustness of the cabinet.
The Coding System for Automatic Injection Mold Integrated CAD/CAPP
Authors: Wang Li Li , Li Kai Ling , Liang Chang Ji
Published: March 2010

Based on the Group Technology and according to the function, structure and manufacturing process of the injection mold, a classification and coding system for injection mold is developed specially. The system is mainly centre around the classification, code structure and the way of the coding, by which the information description and transmission between CAD and CAPP becomes unblocked, the mold CAD/CAPP integration and automation in design and process comes true. It is supposed to help reduce the time in process planning, increase plan consistency and efficiency, improve mold quality and minimize the time-to-market for the mold products.
A New Type Adjustable Shock Absorber and its Characteristic Model
Authors: Hu Jun Xiu , Jiang Hao Bin , Long Chen , Wang Tao
Published: March 2010

A new type adjustable hydraulic shock absorber for a bus air suspension is designed, the solenoid valve and swing pneumatic cylinder are adopted as driving device for changing damping states. The structure and work principle of the shock absorber is introduced. By applying hydrodynamic theory, a mathematical model of shock absorber’s damping characteristic is built. Several typical algorithms for calculating damping valve plate’s deflection are analyzed. Conjugate Beam Method, an approximate method with relatively less calculation work, is chosen to calculate the deflection of valve plates. Main structural parameters’ affecting on shock absorber’s damping performance are simulated, the shock absorber specimen is manufactured. The bench test results of specimen show, “hard” and “soft” damping states switch reliably, damping force deviations between test and simulation results are less than 4%. It is verified the established model for adjustable shock absorber is correct, the Conjugate Beam Method for calculating valve plates’ deflection is effective.
Extraction of Tiny Crack for Magnetic Ring Based on Wavelet Transform and Morphology
Authors: Wang Yu Huai , Wang Qi Hui , Wang Li Dong
Published: March 2010

This paper presents a method for extracting the tiny crack on the surface of magnetic ring. First, the magnetic ring image is decomposed, enhanced and reconstructed by applying wavelet transform and enhancement function. Then, the discontinuity of crack is removed by morphological operation and the crack image is extracted by using masking technology and threshold technology. Finally, the algorithm proposed in this paper is analyzed and verified by experiments.
Dynamic Analysis of a Rotatable Mobile Robot Based on Turning Pose
Authors: Zhao Yi Hong , Chen Rong Fa
Published: March 2010

A rotatable wheeled mobile robot is studied to develop a ground robot applied to special rough environment, such as turning a somersault. The system structure and design are described in this paper. The dynamic modeling of turning states is inferred by Alembert Principle. Some parameters are analyzed combining driving ability. The robot’s condition of overthrow and reset is gained. The dynamic simulation analysis of the turning state are realized with ADAMS software, the main factors influencing turning function are found. The results help to design the wheeled mobile robot, which can run successfully in a complicated environment and develop its adaptability.
Research on Parameters Optimization of Virtual NC Milling Based on Parallelism Selection Genetic Algorithm
Authors: Sui Xiu Lin , Kong Zheng Wei , Ge Jiang Hua , Zhang Jia Tai , Jin Li Juan
Published: March 2010

To resolve key technology of parameter optimization of virtual NC milling physical simulation system, a multi-objectives optimized model was set up by non-linear programming theory and resolved by improved parallelism selection genetic algorithm. It was optimized when milling characters are sufficiently considered and machine quality was guaranteed. Sub-population size is decided by weighting each optimized object and calculating adaptation to assure importance of optimized objects and fasten convergence velocity. A kind of software that can optimize milling parameters of virtual NC was developed, and optimized strategy and validity of algorithm are verified which provides technology support for realizing virtual NC milling physical system.
Optimal Layout of the Irregular Parts with Neural Networks Hybrid Algorithm
Authors: Shi Jun You , Zhai Hong Yan , Su Chuang Sheng
Published: March 2010

An irregular parts optimal layout method based on artificial neural networks is proposed. The manufacturing process of parts is involved in the layout problem. Every side of shapes is expanded in consideration of the machining allowance. Self-Organizing Map (SOM) and Hopfield artificial neural network are integrated to complete the automatic layout. In the beginning, irregular parts are randomly distributed. Self-Organizing Map is used to look for the best position of the irregular parts by moving them. The overlapping area is gradually reduced to zero. Hopfield neural network is used to rotate each part, and each part's optimum rotating angle is obtained when the neural network is in stable state. The algorithm in this paper can solve the irregular parts layout problem and rectangular parts layout problem in the given region. Examples indicate that this algorithm is effective and practical.
Research on the Three-Dimensional Elliptical Motion of Rotary Traveling Wave Ultrasonic Motor
Authors: Wang Yu Ping , Zhao Zeng Hui , Zhao Xiang Dong , Wang Yan Guo
Published: March 2010

The model of a particle on the stator tooth side of traveling wave type rotary ultrasonic motor is established based on the plate theory, which shows that trajectories of particles on the surface of the stator teeth are essentially three-dimensional Oblique elliptical motion. Take the RTUM60 type ultrasonic motor as an example, the three-dimensional elliptical motion of stator tooth’s endpoint is studied through numerical experiments, and the results show the energy loss caused by the radial sliding between stator and rotor is considerable. The influences of tooth height on effective elliptical motion, the velocity in the three direction under Cylindrical coordinate system and radial slip are also discussed, which conclude that the model can be used for further study on the contact model design and optimization traveling wave type ultrasonic motor.
Design of Precise and Efficient Synchronized Multi-Axis Control Servo System
Authors: Luo Wei , Guo Yin Biao , Yang Wei , Rao Rui Zhi
Published: March 2010

Having studied the synchronized multi-axis control servo system, some type automatic wire striping and terminal crimping system is developed in the paper. In order to realize the precise and efficient synchronized multi-axis control, the PVT (Position-Velocity-Time) algorithm is adopted. This algorithm allows user to specify the time interval of each axis’ motion segment, so the multi-axis working sequence can be easily established in a tight way which augments the system processing speed and guarantees the system stability. Besides, by specifying the position and speed value at the processing point, the positioning accuracy and speed requirement at the processing point can be reached. In the design of the system control software, the modularization design is employed. This modularization idea simplifies the complex software design and allows people use the software more easily. Finally, the experimental result shows the system has a good synchronization performance, and meets the requirements of high efficiency, stability and positioning accuracy in practical production.
Numerical Study of Dynamic Response of Steel Deck Pavement under Traveling Random Vehicle Load
Authors: Qian Zhen Dong , Liu Yun
Published: March 2010

The steel deck pavement on long-span steel bridges is subjected to the heavy impact load imposed by the passage of millions of trucks during the several decades of its service life, and severe premature failures of steel deck pavement have appeared, especially the cracking. The irregularity of the pavement surface was simulated according to the power spectrum density function, and the random load was calculated according to the vehicle vibrating equation. Finite Element Method was used to build the vehicle-pavement coupling model. The effects of vehicle speed on the dynamic response of pavement were studied. Research results have proved that the maximum transversal tensile stress related to the cracking firstly increases and then decreases with the increase of vehicle speed.
Structure Design and Multi-Domain Modeling for a Picking Banana Manipulator
Authors: Wang Hong Jun , Chen Jia Xin , Zou Xiang Jun , Liu Chang Yu
Published: March 2010

Based on agronomic and harvest characteristic analysis for bananas, according to bionic principle, a mechanism of picking banana manipulator simulating action of a person manually picking bananas was proposed, which was consisted of rotary mechanism, lifting mechanism, and shift mechanism, the body mechanical model of the picking banana manipulator was established. The multi-domain uniform model of a picking banana manipulator was developed employing the virtual simulation and modeling language Modelica. A body structure model for picking banana manipulator was established based on component models in DriveLib model library. Motion control’s mathematic models for picking banana manipulator were analyzed according to drive motor performance for the body structure, the simulation model of a mechanical motion control for the picking banana manipulator were realized in Dymola simulation platform. The validity models could provide a theoretical basis for picking banana manipulator primary design.
Research and Analysis on the Mechanical Characteristics of Brush Shape Cleaning Element in Spiral Installation
Authors: Meng Yan Mei , Dong Zhen , Lu Fu Ning , Li Shang Ping , Xu Kai
Published: March 2010

The cleaning element is not only the key part of the sugarcane harvester, but it is also the bottleneck of the development within the whole stalk of the sugarcane harvester. In this paper, it will theoretically elaborate on the structural forces that act on the spiraled and brushed shape cleaning elements during the process of the sugarcane cleaning. The paper also elaborates on the combined rigidity of elements in different arrangement installations and the maximum stress that acts on its roots. In addition to this，the FEA (Finite Element Analysis) software-ANSYS is used to analyze the structural force, the maximum stress, and the air resistance that is generated during the working process. The results of the analysis have been validated by experimentations. The experimental results indicate that, with the proper spiral angle cleaning element installed, it can both enhance the cleaning efficiency and reduce the maximum stress and the air resistance. Accordingly, it can improve the cleaning quality, prolong the working life of the cleaning element, and reduce the idling power waste of the cleaning device.
Numerical Simulation and Experimental Study on the Weld-Line Movement of Tailor-Welded Blank
Authors: Hu Xiu Li , Zhao Hao , Xing Zhong Wen
Published: March 2010

TWB and its forming technology play important role in lightweight manufacturing for the automobile parts. The weld-line movement during TWB forming process affects the product quality greatly. In this paper, two main influence factors of the movement, BHF and the blank thickness at the both sides of the weld-line, were studied by both the experiments and finite element simulation. The results showed that BHF has significant impact on the weld-line movement, especially when the thickness difference of the blanks in TWB is beyond a certain range. Besides, suitable BHF and thickness of the blanks can not only control the weld-line movement, but also improve the formability of TWB.
Numerical Simulation of the Cooling Effect by Air Conditioner and Spraying in High-Temperature Working Face
Authors: Liu Guan Nan , Gao Feng , Ji Ming , Liu Xing Guang
Published: March 2010

A multicomponent turbulent model of the airflow in working face was modeled.And the simulation result is compared with the measured temperature.The temperature of the airflow along the transportation channel of working face goes up,and the gradient of the temperature curve is flat.Then the low-temperature droplets are simulated by stochastic separated flow model.The interaction between grains and fluid are simulated by adding source terms in conservation equations.The temperature curves of the airflow under different cooling schemes are investigated.If the air conditioner is in front of the nozzles,the temperature of the air near the inlet is low and uniform,and the cooling effect of the outlet is obvious.
The Effects of Normal Gap Distribution on Cathode Design of Aero-Engine Blades in Electrochemical Machining
Authors: Li Zhi Yong , Ji Hua
Published: March 2010

Cathode design is a difficult problem must be faced and solved in electrochemical machining (ECM). In ECM process, various parameters, such as applied voltage, current density, gap distribution, machining rate and electrolyte composition and concentration, can affect ECM machining process and therefore cathode design. Among all these machining parameters, gap distribution is the most vital. Regard some type of aero-engine compressor blade as research object, this paper concentrates on the effects of the normal gap distribution of 2-dimension and 3-dimension on cathode design based on the cathode design method of , moreover the errors between two and three dimension normal gap also can be compared and analyzed in detail. To verify the accuracy of the designed cathode, the machining experiments were conducted on an industrial scale ECM machine and the experimental results demonstrates that the cathode designed utilizing 3-dimension normal gap exhibits more machining accuracy and therefore valuable.
Supplier Evaluation Based on Mobile Agent and Information Credibility
Authors: Huang Xiao Rong , Guo Shun Sheng , Yu Xiao Bing
Published: March 2010

Supplier evaluation is the most vital action of supplier selection. Supplier evaluation data is divided into two kinds: the qualitative and the quantitative. In this study, it proposes through using mobile agent to obtain quantitative data from suppliers and expert rating methods to get qualitative data. To deal with the inconsistency of time period about getting these two types data, a new method is proposed to process the qualitative data by the establishment of information credibility about evaluation data. The obtained results show that the proposed method is well suited for supplier evaluation to shorten the evaluation cycle and enhance the timeliness.
Effect of Ca Content on Mechanical Properties of 4N Gold Wire for Quad Flat Nolead (QFN) Stacked Die Package
Authors: Jalar Azman , Radzi Saidatul Azura , Hamid Muhammad Azmi Abd
Published: March 2010

This paper discusses the effect of two similar gold wire (wire A and wire B) used mainly as a wire bonding material for Quad Flat Nolead (QFN) package. Both wires with diameter of 25.4 μm were bonded using automatic wire bonder by maintaining the temperature at 200°C. The effect of trace elements on the mechanical properties of 4N gold wire has not been widely investigated for some years despite the important of wire-bonding and the move towards fine pitch applications. Due to the element analysis, atomic percentage of Ca in wire B is higher than wire A. Pull strength increase with the increasing of the trace element. The higher pull strength of wire B could improve the yield strength, elastic modulus and recrytallization temperature.
A Structural Topological Optimization Method Based on Varying Displacement Limits and Design Space Adjustments
Authors: Rong Jian Hua , Li Wei Xiang , Feng Bing
Published: March 2010

In the proposed topology optimization method, the whole optimization process is divided into two phases. Firstly，an optimization model dealing with varying displacement limits and design space adjustment approaches， after the combination of structural discrete topology variable condition and the original objective， are built. Secondly，incorporating smooth optimization algorithm，a procedure is proposed to solve the optimization problem of the first optimization adjustment phase. This design space adjustment capability is automatic when the design domain needs expansion or reduction, and it will not affect the property of mathematical programming method convergences. The structural topology approaches to the vicinity of the optimum topology when the first optimization adjustment phase ends. Then, a heuristic algorithm is given to make the topology of the design structure be of solid/empty property and the optimum topology is obtained during the second optimization adjustment phase. The simulation shows that the topologies obtained by the proposed method are of very good 0-1 distribution property, the proposed method is robust and efficient.
Scatter Point Cloud Denoising Based on Self-Adaptive Optimal Neighborhood
Authors: Liang Xin He , Liang Jin , Guo Chen
Published: March 2010

We present a scatter point cloud denoising method, which can reduce noise effectively, while preserving mesh features such as sharp edges and corners. The method consists of two stages. Firstly, noisy points normal are filtered iteratively; second, location noises of points are reduced. How to select proper denoising neighbors is a key problem for scatter point cloud denoising operation. The local shape factor which related to the surface feature is proposed. By using the factor, we achieved the shape adaptive angle threshold and adaptive optimal denoising neighbor. Normal space and location space is denoising using improved trilateral filter in adaptive angle threshold. A series of numerical experiment proved the new denoising algorithm in this paper achieved more detail feature and smoother surface.
Electromagnetic Field Simulation and Experiment of Electromagnetic Forming of Magnesium Alloy Tube
Authors: Wang Zhe Feng , Wang Zhe Ying , Cui Jian Zhong , Piao Feng Xian , Gao Tie Jun , Li Quan , Huang Wen Tao
Published: March 2010

The AZ31 magnesium alloy tube was used for electromagnetic forming experiment of three kinds of input voltages. The stress-strain state of tube forming was analyzed. It was shown that the cause of oblique crack of tube was of axial inhomogeneous distribution and , and the cause of longitudinal crack was and of inhomogeneous distribution in circumferential direction. Moreover, the electromagnetic field and force field during electromagnetic forming was simulated by ANSYS software. The experiment proved the simulation result.
Application of an Improved Shell Element in Springback Analysis
Authors: Zhang Hong Zhe , Zhang Shu Ren , Xia Yang , Hu Ping
Published: March 2010

In this paper, the shell element with drilling degree of freedom (DOF) is applied to springback analysis, which possesses most satisfactory robustness and accuracy by describing complicated bending deformation precisely. At each node, six DOF make the element easy to connect to space beams or intersecting shells. The locking phenomena are controlled. We conducted implicit finite element method (FEM) analysis for springback simulation with this element in which the results show as good quality as BT shell, and in a few cases even better performance. As a result, this element is integrated in our stamping analysis software platform King Mesh Analysis System.
Development of CAD/CAM Software System for Large Non-Regular Steel Constructions
Authors: Yang Hui Zhu , Chang Zhi Guo , Yang Zong Lin , Zhang Qi Lin
Published: March 2010

Sun-valley of Expo-axis is irregular large-span steel structure building. For the complicacy and specialty of tubular joint conformation, existing domestic and oversea professional software are incapable of solving the detailing work of this structure. Characteristics, difficulties and function requirements of the engineering are analyzed; the framework, data structure kernel and implement algorithm of important functions are designed for a specialized integrated detailing/manufacture CAD/CAM information system. This software comprises the functions from 3D solid modeling to automatic output of shop drawing and NC data, and it has been successfully applied to the actual construction work of sun-valley project.
Fire Protection Design for Steel Staggered-Truss Framing System Based on Mechanical Performance Calculation
Authors: Chen Chang Kun , Zhang Wei , Zhang Dong
Published: March 2010

An optimizing strategy, based on the performance calculation of mechanical properties under high temperature, was proposed to study the method of fire protection design for steel staggered-truss framing system (SSTFS). That is, the whole elastic-plastic process of the structure is investigated using the finite element method firstly, and the components which appear plastic deformation easily are found, and then their fire resistance rating would be enhanced especially. In comparison with the traditional regular fire protection strategy, it is confirmed that the fire resistant capacity of the SSTFS can be improved dramatically. And the security of the structure could be ensured, while the required volume of fire protection coatings is reduced.
Dynamic Characteristic Analysis of the Horizontal Machine Center
Authors: Zhang Li , Zhong Liang Wei
Published: March 2010

Modal analysis of machine center was carried out by means of finite-element analysis (FEA) method to get its characteristics and to improve its machining precision. Based on this, harmonic response analysis was processed to evaluate its vibration when the cycle load caused by the machining force was applied on the main shaft of machine center, which was used to provide clues for avoiding resonance vibration and ameliorating design.
Study on Rapid Variable-Type Design Method of Gantry Crane Based on Templates
Authors: Wang Zong Yan , Zhu Dong Xia , Lu Chun Yue
Published: March 2010

To solve the problem such as large amounts of repeated designs and long design cycle in the traditional design process of crane, the principles of variable-type design were illustrated detailed on the background of holographic model, a series of key variable-type design technologies were introduced based on template concept, including parameter link technology of module interface, assembly sketch technology, coding techniques of assembly configuration, parametric finite element analysis technology etc. These methods have been applied to the design case of gantry crane, it proves that these methods can enhance the system reusability, improve the design efficiency of products and make the design results more perfect, and has achieved desired outcome.
Modeling and Control Method for Multi-Layer Distributed Flow Based on WFCP-Net
Authors: Wang Hai Wei , Liu Geng , Zheng Dang Dang
Published: March 2010

According to the simulation requirement for complex mechanical system, building flow modeling and control mechanism is the main content of development for the collaborative simulation platform. Based on research and analysis to WFCP-Net technique, we present multi-layer distributed flow. Management flow and simulation flow are defined, and a suit of entity class model and a kind of flow control mechanism are designed. Finally, the method is verified by the platform developed.
Vision-Based Two-Handed Interaction for Augmented Reality
Authors: Wu Yue Ming , He Han Wu , Zheng De Tao
Published: March 2010

A vision-based two-handed interaction approach for augmented reality is described. In order to achieve the real-time performance, the hand model and gestures are simplified by only using three key points on the hands: the tips of index finger and thumb, and the concave point between the tips of index finger and thumb. Moreover, a user intention recognition method is applied for the interaction. This method allows that the operation can be added or changed easily by modifying user intention recognition rules. Finally, a prototype system is developed to demonstrate the effectiveness and robustness of the presented approaches.
Pattern Recognition for Control Charts Using AR Spectrum and Fuzzy ARTMAP Neural Network
Authors: Zan Tao , Wang Min , Fei Ren Yuan
Published: March 2010

The control charts pattern recognition can detect the unnatural fluctuation of the machining process and enhance the automation level of quality management, so it is important for manufacturing enterprise to implement the automatic pattern recognition of control charts. In this paper the quality data generated by Mote-Carlo simulation are preprocessed through AR spectrum analysis and the characteristic quantity are picked up in frequency domain. This approach decreases the complexity of characteristic quantity compared with traditional encoded mode. Then Fuzzy ARTMAP neural network which has incremental learning ability compared with traditional BP neural network is presented to recognize the control chart patterns. The recognition result indicates that the introduced method in this paper has advantage of traditional methods.
Multidisciplinary Collaborative Product Modeling in Distributed Network Environment
Authors: Zhu Wen Qing , Chen Liang
Published: March 2010

Based on the analysis of product model characteristics of multidisciplinary collaborative design (MCD), multiple views model expressed by an extended object-oriented method is introduced to satisfy the requirements of different discipline designers for product information interaction and share. A product modeling system for multidisciplinary collaborative design is proposed, and the modeling method of discipline view model under the network environment is given, which can effectively support the evolution of product model and improve the flexibility of product modeling. The clutch is illustrated to validate the proposed methods.
A Design of Large-Scale Speed Modulation in Hydraulic Cylinder and its Application
Authors: Xiao Jun , Gan Yong , Ma Wen
Published: March 2010

This paper presents a hydraulic controlling mode to drive a hydraulic differential cylinder with a wide range of speed options. Two different pumps are used to control the cylinder on both sides of the oil chambers by adjusting speed and direction of the pumps. To accomplish a precise position for the cylinder among the wide speed range, the pumps are driven by two servo motors. This control mode is applied on a wheelset assembly machine to ensure dimensional accuracy of pressed wheels on an axle.
The Study of Mechanical Product Concept Design Method Based on Reverse Engineering
Authors: Li Pei Gang , Feng Xian Ying , Shen Xiao Xia , Zhang Cheng Liang
Published: March 2010

The mechanical product concept design method based on reverse engineering (RE) is a new approach in the concept design domain. The functional pattern is thought as an effective carrier and medium of mapping function to structure, which provides an efficient path for expressing the intrinsic evolution rule of the complex mechanical qualitative structure. And it is used as the information organization unit and the assembly product information model, which could give some help to express the design knowledge effectively. Therefore, we proposed a mechanical product concept design method based on RE. The examples indicated that this method is feasible and it provides a practical technical way for the knowledge reuse and continue innovation of the existence products.
Effect Study on Deformation of Links to Error of Parallel Manipulator
Authors: Zhu Chun Xia , Guan Li Wen , Wang Li Ping
Published: March 2010

Aimed at the effect problem of deformation of links on position error of parallel manipulator, the 3-TPT parallel manipulator is taken as a study object. The deformation error of links of parallel manipulator was built by error independent principle based on kinematics; the simulation analysis also is carried out by virtual prototype technique, and the effect laws of deformation of links to error of parallel manipulator are given. The results showed that when the deformation length of links is given, the position error can be affected by deformation of each link and the coordinate position of origin in reference frame; At the beginning of parallel manipulator moving, the deformation of links are small, and with the time increasing, the deformation of links obviously affect the final position error of parallel manipulator. The two method proposed in this paper can be used for pre-estimating the error and reducing harmful effects.
Hot Deformation and Processing Maps of a High Strength Alloy Steel
Authors: Lin Yong Cheng , Liu Ge
Published: March 2010

The hot deformation behaviors of a high strength low alloy steel have been studied using the processing map technique, which is based on the variations of efficiency of power dissipation with forming temperatures and strain rates. The results show that: (1) The average grain size of the deformed alloy steel increases with the increase of forming temperatures and decreases with the increase of strain rates. (2) The efficiency of power dissipation increases as the forming temperature is increased. However, the efficiency of power dissipation changes with strain rates in the form of bulgy parabola, and the maximum value exists at the strain rate of 0.1 . (3) A domain for reasonable dynamic recrystallization (DRX) exists in the temperature range of (1050–1150) and strain rate range of (0.01–3) , with its peak efficiency of 32% at about 1140 °C and 0.23 , which are the optimum hot working parameters for the studied high strength low alloy steel.
Structural Analysis of Composite Shield Cutter-Head and Cutters Arrangement Optimization Based on Finite Element
Authors: Xia Yi Min , Zhou Xi Wen , Xue Jing , Luo De Zhi
Published: March 2010

With the comprehensive use of finite element and computer simulation, the cutter-head was analyzed and optimized. Based on the full analysis of structural features of the cutter-head, the finite element analysis model of the cutter-head was set up by using Solidworks and ANSYS. The analyses of the cutter-head under two kinds of limit load conditions were carried out and the stress distribution of the cutter-head was obtained. According to the tunneling characteristics, the cutters were re-arranged. The analysis showed that under the same conditions, the stress distribution of the improved structure was more symmetrical and the maximum stress and maximum deformation also had a remarkable reduction. Also there was a greater stress between the corbel and the flange; it would be of vital significance to increase the welding strength of these parts. And the results could provide basic data for the structure design of cutter-head.
The Effects of Different Defects on Buckling Behavior of Single-Walled Carbon Nanotubes
Authors: Chen Li Jie , Zhao Qi , Gong Zun Qun
Published: March 2010

In this paper, based on the continuum mechanics method, we adopt the three-dimensional finite element (FE) models to study the effects of different defects on buckling behavior of armchair and zigzag single-walled carbon nanotubes (SWCNTs) under axial compression. The variations of the buckling modes and the critical buckling strains with the diameter and the length-diameter ratio of SWCNTs are investigated. The diameters of SWCNTs vary from about 0.2 to 2 nm, and the length-diameter ratios vary from 3 to 30. Two kinds of atom vacancy defects are considered. The calculation results show that the length and the diameter of SWCNTs are relatively significant factors affecting the buckling behavior of SWCNTs. There is an optimal diameter with which the SWCNTs can bear much higher axial compression load than those with other diameters. The defects affect the buckling behavior of SWCNTs obviously when the length-diameter ratio of the nanotube is about less than 8 and the defects studied in this paper can decrease the critical buckling strain by a largest proportion of 41.5%.
The Study on Advancing Velocity of Hydraulic Support
Authors: Zhang Xin , Zhang Jian Wu , Wan Li Rong
Published: March 2010

Based on modeling and simulation technology, this paper puts forward a new method of studying quantitatively advancing velocity of hydraulic support, which is helpful to the optimization design of hydraulic support. Taking a certain type of hydraulic support as an example, the influence of hydraulic parameters such as flow rate, pressure, and pipe diameter on the advancing velocity of hydraulic support is analyzed. In order to increase advancing velocity, the flow rate of pump station and the diameter of main return pipe should be increased.
Collaborative Commodity Design System Based on DARFAD
Authors: Wang Yan Dong , Liu He Shan , Wang Zhen Ya , Zhao Ying Xin
Published: March 2010

This paper presents the concept of Collaborative Commodity Design (CCD). The main features of CCD is introduced, and the general development process and overall framework of CCD is proposed. Collaborative Commodity Design System (CCDS) implementation is discussed in detail with emphasis on two different aspects: generation process of economic schemes and creation of dynamic alliance module structure. Finally a product design case study has shown operability and efficiency of the system.
Research on Machining Face Gears Using a CNC Hobbing Machine
Authors: Zhao Ning , Guo Hui , Fang Zong De , Gao Hao
Published: March 2010

This paper introduces the generation of face-gear by a worm and the coordinates system. A scheme for cutting face gears using a CNC hobbing machine is described in detail. The determination method for the machine parameters is given. An experiment is done for validating the method.