bluuebunny/crossref_metadata_2025 huggingface dataset:
A Web-Based Customization Product Design System
Authors: Wang Yun Xia , Wang Zhi Liang , Ni Xiao Yu
Published: October 2009

To improve product family design methods for mass customization currently, scale-based modular method for product family design is proposed. On the basis of it, a web-based customization product design system is built. Three processes are included in the system: modeling product family, customizing individual product and estimating cost. Key technologies used in the system are studied on focus that include modular design, scale factors design, tabular layouts of article characteristics (LAC), Case-Based Reasoning (CBR), parametric CAD (SolidWorks) and so on. Finally, taking MK2110 internal grinder as an example, the web-based customization design system is set up.
Study of Water Temperature Control Strategies for Fuel Cell Electric Vehicle Engine System
Authors: Zhao Guang Yao , Peng Cui Yun , Chen Hai Xia
Published: October 2009

Recently, the technology of fuel cell electric vehicle has won startling progress, because of the energy scarcity and circumstance pollution. Of the technology, one of the key is the hydro-thermal control strategy. This paper, with the analysis of the principle of the proton membrane exchange fuel cell cooling water circulatory system, and the research of modern intelligent control theory and methods such as fuzzy control, neutral network control, PID control etc., makes some research on the above-mentioned system based on the ANFIS neutral network reasoning system control and fuzzy-PID control, and has made well control effects via the establishment of fuzzy control rules. Furthermore works of this paper on the appraisement of different control principle and methods plays an important role on the improvement of the intelligent control level and performance of the proton membrane exchange fuel cell cooling water circulatory system.
Design Object Planning of Vehicle NVH Performance Improvement Based on HOQ
Authors: Liu Jie , Tong Ling , Li Chao Feng , Wen Bang Chun
Published: October 2009

Basing on the system engineering 7D design planning model included the seven aspects of contents: design ideas, design environment, design objective, design step, design content, design method and design quality assessment. Combined the 7D design planning with House of Quality (HOQ), the model of design objective planning model was presented. In the model the satisfied degree of customer was the optimization object. The customer needs were satisfied with the engineering characteristics. The customer needs were analyzed with the analytic hierarchy process. The correlation among engineering characteristics was considered through the improvement relation matrix. At the same time, each customer need was insured to improve with the limited resource. Contrasted with the general optimization model this design objective planning model took the correlation of engineering characteristics into account. This optimization model was applied successfully in the NVH (Noise, Vibration, and Harshness) improvement design of vehicle. The HOQ of NVH planning was established according to the four customer needs. The six engineering characteristics were confirmed corresponding to the customer needs. The results showed that the customer need degree achieved 75.53％. If the satisfied degree wanted to be improved the cost should be increased. In this design objective planning model the resource and technology were configured in reason. It could help the technician make the reasonable judgment.
Dynamic Analysis of Vibration Compaction System Base on Transfer Matrix Method
Authors: Liu Yang , Feng Fei , Chen Ya Zhe , Wen Bang Chun
Published: October 2009

To study the dynamic characteristic of a vibration compaction system, we first build up a double DOF model, then it is solved with transfer matrix method and the mathematical description was carried through on the status of every units in the model. Through the analysis of simulation data with simulation software, the data with the transfer matrix equation is the same as data with simulation software. This made clear that the transfer matrix model approaches to the practical circumstances and it bears important referencing value to the dynamics analysis of the correlation system.
Finite Element Analysis of the Effect of the Compressive Loading on Fatigue Crack Growth under Different Loading
Authors: Sha Yu , Tang Hui , Song Xin , Zhang Jia Zhen
Published: October 2009

In this paper, elastic-plastic finite element analysis has been performed in order to obtain the fatigue crack tip parameters under tension-compression loading. Two centre-cracked high-strength aluminum alloy with a crack length of 2mm under different tension-compression loading are analyzed. The analysis shows that the compressive loading has a significant contribution towards the crack tip plasticity and the crack tip stress. In a tension-compression loading the crack tip displacement increases with the increase of the compressive stress and the crack tip compress stress increases with the increase of the compressive stress. The maximum stress intensity Kmax in the tension part of the stress cycle and the maximum compressive stress in the compression part of the stress cycle are the main factors controlling the near crack tip parameters.
A New De-Noising Arithmetic in the Output Signal of FOG
Authors: Liu Ying , Li Yan , Xu Jin Tao
Published: October 2009

To reduce the noise error existing in the output signal of fiber optic gyroscopes (FOGs) and increase the precision of the FOGs, this paper established a mathematical model of the FOGs output signal, analyzed the error characteristics of the FOGs output signal, put forward a new de-noising arithmetic based on the wavelet transform, soft and hard threshold compromise filtering, threshold values were determined by multi-dimensions recursion arithmetic. Through experiment, it has been already validated that the proposed approach had the competitive performances on visual quality, signal to noise ratio (SNR) and the standard variation, it is effective in eliminating the white noises existing in the output signal of the FOG.
Dynamic Simulation and Control Strategy of Centrifugal Flying Shear
Authors: Song Jin Chun , Wang Chang Zhou , Xu Dong
Published: October 2009

Centrifugal Flying Shear is one of the most advanced equipments, which is widely used in tandem mill production lines because of its simple structure and high shearing precision. In this paper, the working principle of the centrifugal flying shear was introduced; the three-dimensional model of the centrifugal flying shear was established; the structural analysis and the dynamic simulation of the flying shear, with the movement rule and trajectory, were made based on MATLAB/SimMechanics and Solidworks/COSMOS Motion; and the control strategy of realizing scale shearing was proposed. The results obtained provide theoretical basis for design of the electronic control system, and facilitate further analysis of the shearing process and parameter optimization design of similar flying shears.
An Access Control Model for Workflow in Service Oriented Environment
Authors: Wei Yong He , Hao Yong Ping , Wang Yang
Published: October 2009

Workflow access control is an important issue in workflow security. Although there exist some standards for security of Web services and access control for services in distributed systems are well studied, there is a lack of comprehensive approach in access control for web services, especially in workflow. This paper proposes a service oriented workflow model and its access control model. The basic authorization unit is task service which is an abstraction of task in the access control model. In this context, we present the dynamic separation of duty based on task services and their conflict relations. Furthermore, we show this model satisfies access control requirements in workflow.
Geometric Modeling for Unitary Rotor of TMP by UG NX CAD
Authors: Wang Xiao Dong , Qi Peng
Published: October 2009

To manufacture the complicated turbo molecular pumps (TMP) rotor by NC machine tool, a geometric modeling for unitary rotor of TMP is created by UG NX 4.0. Based on the optimized geometric parameters of turbo blades, the coordinate system was defined, the wheel and blades were created, and the unitary rotor was built, then the outline of rotor and blade root were modified by cylinder and arc on UG CAD platform. The geometric model of the TMP rotor will be used in the next manufacturing step: NC programming. The result of TMP rotor geometric modeling is shown that UG NX CAD is an available tool to design and manufacture TMP unitary rotor.
Parametric Oscillation Model of Crane with Lifting Motor Reducing Load Swing
Authors: Li Wei , Hu Xiang Peng
Published: October 2009

Dynamic characteristic was analyzed for the hydraulic anti-sway system,and established the mathematical model of crane system by using Lagrange equation. For crane load swing problems, established the Parametric oscillation model of crane, through coordinate transformation, transformed the differential equation of crane into the standard form of Hill equation, and with research on Hill equation we can get the condition about damped oscillation. With the introduction of the parameter plane, the stable map of Hill equation can be drawed, i.e. the map of load damped oscillation. We used MATLAB-Simulink to simulate. The vertical motion of hoist has obvious influence on load sway. Through controlling cable length lifting motor has some good help to lowering sway angl of crane load.
Research on Impact Mechanism of Hydraulic Rock Drill
Authors: Tian Wen Yuan , Liu Ping , Cai Guang Qi
Published: October 2009

This paper introduces the working principle of the impact mechanism which is belonging to the double-chamber scavenge oil hydraulic rock drill. On the basis of some fundamental hypothesis, a mathematical model of hydraulic impact mechanism is established, then carrying out a dynamic simulation. Focusing on the influence of supply pressure, supply flow and precharge pressure on the working performance of impact mechanism, some research is implemented, and some regularity conclusions are obtained.
Motorcycle Dynamics Simulation Based on Real Road Load
Authors: Shi Xiao Hui , Zou Xi Hong , Shi Quan , Xiao Shun Li
Published: October 2009

The motorcycle dynamics simulation method based on the road simulation test and virtual prototype is developed, and a rigid-flexible coupling virtual prototype with test platform of motorcycle is created with CATIA, NASTRAN and ADAMS software. According to two-channel tire-coupled road simulator of MTS Systems Corporation, the simulation model and platform are repetitively refined to fairly high precision by comparing simulation results with experimental results. The iterated excitation signal based on real road load or typical spectrum of different roads is imported into the virtual test platform, the comfort and durability tests of motorcycle can be undertaken to replace road simulator, the test period and cost are greatly reduced, and test security is increased.
Actuating Mechanism and Analysis of a Square-Type Rotary Ultrasonic Stator Using Longitudinal Vibration Transducers
Authors: Liu Ying Xiang , Liu Jun Kao , Chen Wei Shan , Shi Sheng Jun
Published: October 2009

A square-type rotary ultrasonic stator using longitudinal vibration transducers is proposed. The proposed stator contains four longitudinal vibration transducers, which are located in square-type. Every longitudinal transducer includes two exponential shape horns located on each end. And the horns of adjacent transducers intersected at tip ends where located the driving feet. The longitudinal vibrations of transducers are excited by the longitudinal vibrations of PZT ceramics. Longitudinal vibrations of adjacent transducers are superimposed in the driving foot and generated elliptical trajectory. The actuating mechanism is analyzed, and the motion trajectories of driving feet are deduced. The stator is designed and analyzed by using FEM method. The vibration characteristic of stator is gained by transient analysis. Results indicate that the motion trajectories of the four driving feet have good consistency, and the proposed motor has potential good output characteristics. The results of this paper verify the theoretical feasibility and provide instructions for the development of proposed stator.
Foot Shape Reconstruction Based on a Monocular System Using Structured Light Projection
Authors: Ke Ying Jie , Li Li Jun , Jiang Kai Yong
Published: October 2009

Reverse engineering has an increasing use in shoemaking process for rapid prototyping of shoe lasts. Foot shape reconstruction is one of the most important techniques in custom-made scheme. A system for reconstruction a foot shape from its 2D views using a coded structured light projection combining with the optical triangulation method is presented. A set of multiple gray coded patterns are projected to the target object through a projector and the distorted stripes patterns produced by its surface are captured by a digital camera. By adopting the optical triangulation method with the projector-camera parameters known in advance, the foot shape surface is reconstructed. The results show that the implemented system is able to reconstruct dense and precise 3D foot shapes.
Analysis of the Sharp Resonance Control Synchronization for Dual Motors Exciting Nonlinear System Based on Sliding Mode
Authors: Li Xiao Hao , Liu Jie , Liu Jun Tao
Published: October 2009

Aiming at the control synchronization problem of the dual exciting motors in nonlinear vibrating system, based on the phase-difference state space equations, to establish the nonlinear sliding mode controller for the control synchronization of dual exciting motors. The results of the numerical simulation indicate that the control synchronization by sliding mode control strategy can effectively reduce the synchronization error which caused by the performance difference of motors etc., under system sharp resonance conditions (resonant frequency ratio z=0.95~1.05).
Design and Implementation of a MEMS Design Process Description Language- MDPDL
Authors: Yan Xiang Tong , Jiang Ping Yu
Published: October 2009

For the complexity and miniaturization of MEMS, MEMS design process is extremely different from general mechanical design process. Commonly the design flow is dominated by “trial-and-error” methods. It is necessary to describe design process of MEMS for reuse. This will help to reduce the number of redesigns and thus decrease the time to market. Based on XML and necessary extensions being made, a MEMS design process description language, called MDPDL, is presented and the syntax and implementation are discussed in detail. The Document Type Definition (DTD) is adopted to define the syntax rules for the tags of MDPDL, considering core activities and related resources of MEMS design process. Finally, an implementation case has been given out to illustrate the efficiency of MDPDL.
Research on Parameterized Modeling Method of Parts and Components Library for Rapid Response System
Authors: Hou Shou Ming , Liu Yong Xian , Yan Bo , Sheng Zhong Qi
Published: October 2009

In order to meet the requirement of mass customization and rapid response design, a hierarchical parameterized modeling method of parts and components library is proposed. The library of parts and components is building up with NX/Open development tools based on the three-dimensional design software platform. According to this method, the master model technique is integrated with top-down modeling method to facilitate the parameterized modeling and variant design of product family. The parameterized modeling process is also demonstrated in details in this paper. As an example, a tools management system for NC machine tools rapid design is developed. It shows hierarchical parameterized modeling method is a practical and effective method of constructing the product resources library.
On the Generation of the Specification Surface Model of Planar Feature with Flatness
Authors: Huang Mei Fa , Li Xiang Qian , Zhong Yan Ru , Kuang Bing , Wang Qiao Yi
Published: October 2009

The new-generation standards of Geometrical Product Specifications (GPS) take the measurement and verification of manufactured parts according to the duality principle. The Specification Surface Model (SSM) is a simulation model of the actual manufactured part which plays a decisive role in the process of duality verification. The existing methods, however, have not been found to carry out much related research on the generation of SSM. This paper presents a method to generate the SSM for the characteristic of planar feature with flatness under the standards of GPS. The mathematical model of the flatness tolerance is firstly established. Secondly, in order to get the simulation points to simulate the actual characteristics of the manufactured parts, both of the functional requirements of the parts and the influences of the manufacturing process are considered. And then the simulation points under the normal distribution are generated within their tolerance zone by computer. By using the approximation method of the least-squares SSM is then obtained. Finally, an example is used to illustrate the proposed method.
Modeling and Simulating of Bending Rolling Valve Controlling Cylinder System
Authors: Zhang Zhi Wei , Wang Gui Qiao , Song Jin Chun
Published: October 2009

The core of shape control depends on the control of the rolling seam. At present, bending rolling control system is used extensively. It mainly depends on the hydraulic cylinder which generates bending rolling force to improve the shape. The dynamic characteristics of bending rolling force have a big influence to the shape. This paper builds the theory modeling firstly, and takes the advantage of MATLAB to simulate and analyze the key characteristics of bending rolling force.
Research and Application of Workflow Technology in Vibration Roller Development
Authors: Zeng Qing Liang , Wang Cheng Long , Li Yu Shan , Li Ping
Published: October 2009

The development process of vibration roller is a collaborative and concurrent process involved with mechanics, electronics and hydraulic disciplines. Poor collaboration among multiple design disciplines can result in frustrating re-work, delayed product launches, blown budgets and sometimes even expensive recalls of shipped products, which is a big challenge to vibration roller development for the traditional Chinese manufacturing enterprises.Workflow technology in vibration roller development is studied and applied in this paper. A workflow model is given, which comprises team member management model and process model. Team member management model defines the organization, the role and the authority of integrated product team (IPT) members involved in the development process of vibration roller. Process model described the general development process of vibration roller, which includes activities, roles related to activities and rules in detailed. According to the models defined above, new workflow software, which is named “Workflow Management System for Mechatronic System” is developed and used to implement the workflow of “the cooperative development of Vibration roller (YZ18JA) of ChangLin Company”. Practice indicates that the implementation of workflow technology can ensure that right information can be delivered to right person at right time in a right way so as to improve the management and control of the whole process, shorten product development cycle and reduce cost.
Dynamic Response Analysis of Working Device of Hydraulic Excavator under Working Impact Loading
Authors: Guo Li Xin , Xie Hua Long , Zhou Shu Wen , Li Jin Li , Wang Zhao Wen , Xing Ru Fei
Published: October 2009

A there-dimensional finite element model of the working device of a single backhoe-bucket hydraulic excavator was developed to analyze and evaluate the rationality of structure design of the working device in this study. By finite element modal analysis, the resonant frequencies and vibration modes of the working device system were obtained. By dynamic response analysis, the changing trends of stress and strain of the device were obtained. In addition, the influence of different excavating resistance forces to the working device on dynamic response of the device system was compared for large and small resistance forces at the beginning excavation moment. The results show that a large resistance force at the initial excavating moment may result in the device vibrating with large vibration amplitude at the beginning excavation moment. These results might provide useful reference on design improvement of the excavator working device.
Product Configuration Knowledge Modeling Using Extend Object Model
Authors: Xu Zhi Wei , Sheng Zhong Qi , Xie Hua Long
Published: October 2009

This paper presents an extended object model for case-based reasoning in product configuration design. In the extended object model a few of methods of knowledge expression are adopted such as constraints, rules, objects etc. On the basis of extended object model, case representation model for case-based reasoning is applied to product configuration design system. The product configuration knowledge can be represented by the extended object. The model can support all the processes of case-based reasoning in product configuration design such as case representation, indexing, retrieving and case revising. The model extends traditional object-oriented model by including the relationship class used to express the relation between the cases, constraints class used in the product configuration knowledge representation, index class used in case retrieving, solution class used in case revise. So the product configuration knowledge that used in the product configuration design can be represented by using this model. In the end a Metering pump product configuration design systems is developed on the basis of the proposed product configuration model to support customized products.
3D Parametric Modeling of Numerical Simulation on Oblique Cutting
Authors: Sheng Jing , Yao Li Ping
Published: October 2009

The finite element simulation of metal machining is a complex process. It is essential to develop a system to construct a model of simulation so as to obtain simulation data conveniently and rapidly. The paper detailed the parametric modeling. The key techniques of 3D modeling with MSC.Marc software and the parametric modeling procedure of metal oblique cutting process were presented in the paper. The modeling rule based on the procedure file was investigated. The interface of the system, designed using C++ Builder, could access data, which includes the geometrical angles and dimensions of a tool, the sizes of a workpiece, the relative position between the tool and the workpiece, their properties and cutting conditions, etc.. The procedure file, which is able to model in the MSC.Marc environment, was created by the program automatically. Calling the file, the system can finish the parametrical modeling of the finite element simulation. Then an example was given and the simulation model was also run. It was proved that the parametric modeling is an effective way for metal cutting simulation.
Manufacturing Execution System Based on a Production Process Modeling
Authors: Zhou Wei , Rao Yun Qing , Shao Xin Yu , Wang Bing Gang
Published: October 2009

Configurable MES is a hot attention in today’s industry. In this work, we present a MES model based on a production process modeling method. With the workflow management technology, a configurable MES framework is introduced and some important implementation methods such as production process modeler, activity script language and production process scheduler are presented. A successful application of an automobile engine assembly line shows that this model is useful and effective.
The Thermal Error Prediction of NC Machine Tool Based on LS-SVM and Grey Theory
Authors: Zhao Chang Long , Wang Yi Qiang , Guan Xue Song
Published: October 2009

In this paper, a hybrid method of correlation analysis based on the gray theory and the least squares support vector machine is proposed to model the thermal error of spindle of NC machine tool and predict the thermal error. The gray correlation analysis is used to optimize the measuring points of spindle. The optimum measuring points and the measured thermal error of spindle are regarded as the data to be trained to build the thermal error prediction model based on the least squares support vector machine (LS-SVM). The results show that the thermal error prediction model based on LS-SVM of NC machine tool has advantages of high precision and good generalization performance. The prediction model can be used in real-time compensation of NC machine tool and can prove the process precision and reduce cost.
The Research of Dynamic Optimization Method on Automobile Shock Absorption Twist Bar Spring Design
Authors: Song Gui Qiu
Published: October 2009

This paper presents recent developments in the study of optimization methods for industrial product design, and provides a method of dynamic optimization design to calculate the optimal loading property of automobile twist bar spring system. This is a different approach to traditional systems that is based on dynamic and random load, applying the basic theory and methods of dynamic design, according to the multi-goal characteristic of automobile twist bar spring. This paper presents a thorough analysis dynamic quadratic fuzzy optimal method of double-goal and the method to determine paper optimal gene. This method is used to automobile twist bar spring design, the result shows that the ability of spring loading is improved; the weight of structure is reduced. The new approach makes the vibration absorbing system more reliable and comfortable. The results presented in this paper are not only applicable to automobile twist bar spring systems but all systems that possess dynamic, random and fuzzy characteristics. This work finds applications in automobile components design and dynamic character analysis.
Feature Line Extraction of the Triangular Mesh Model Based on Curvature and PCA
Authors: Liu Bin , Jiang Kai Yong
Published: October 2009

A method of feature line extraction from triangular mesh model is presented. Firstly, initial feature point is manually specified based on feature points extraction from triangular mesh model. Then begin with initial feature point, Principal Component Analysis (PCA) method is applied to analyze primary direction of special feature region of feature points. Search the feature point which is furthest from the center of mass in the primary direction and it is chosen as subsequent feature point. Iteratively, record the feature point sequence in order. Finally, use three order non-uniform B-spline curve to fit and construct feature line. The experimental results demonstrate that the proposed method in this paper is efficient.
A Revised Critical Chain Method and Optimization Model
Authors: Peng Wu Liang , Jin Min Li
Published: October 2009

For product development projects, to void the risk of project delay, all the tasks should be finished as soon as possible. However, the critical chain method (CCM) requires the non-critical tasks to be executed as late as possible. In this paper, the traditional CCM is revised based on the characteristics of product development. Other than the traditional one, the revised CCM is created based on the active plan, that is, all tasks should be executed as early as possible. And then, the schedule scheme of active plan based critical chain method is given, including searching critical chain, no-critical chain and setting buffers. Consulting in the resource constrained project scheduling problem (RCPSP), an optimal model of CCM is built.
Additive Consistent Fuzzy Complementary Judgment Matrix’s Euclidean Space Distance Weighting Ranking Method
Authors: Guo Chen Guang , Liu Yong Xian , Tian Peng , Hou Shou Ming
Published: October 2009

It is the key step to construct the fuzzy complementary judgment matrix and rank the weighting of the judgment matrix when we apply the fuzzy analytic hierarchy process (FAHP). In this paper, a method of rank the weighting which is based on the idea of additive consistent fuzzy complementary judgment matrix and Euclidean space distance, namely the Euclidean space distance weighting ranking method (EDWM) is recommended. In the end of this paper, a case is given to verify the feasibility and accuracy of this method.
The Numerical Simulation of Horizontal Straightening for 60 kg/m Heavy Rail with Original Curvature
Authors: Song Hua , Fu Li Hua , Wang Pei Long , Ding De Xin , Li Hui
Published: October 2009

It has established the FEM model of nine horizontal roller straightening with original curvature for 60㎏/m heavy rail by using explicit dynamics software ANSYS/LS-DYNA in the paper, and it carried out the dynamic simulation process of the nine horizontal roller straightening, analyzed the stress changing rules of heavy rail in the seven deformation zones during the straightening process , even studied the value and distributive condition of residual stress after straightening, disclosed the mechanism of the residual stress in the heavy rail straightening process, and the paper is a guidance to improve heavy rail quality in straightening craft. It has the reference value to the design of heavy rail straightening machine and the formulation of the straightening regulations.
Study on 7D Planning Model of Synthesized Design Method Based on Systems Engineering
Authors: Li Xiao Peng , Sun Wei , Ren Zhao Hui , Wen Bang Chun
Published: October 2009

From the view of the point of the systems engineering, the model of 7D planning of product design is presented in this paper based on the previous work. The planning of products design includes design ideas, design environments, design objective, design process, design contents, design methods and the design quality evaluation methods, so named 7D planning model. Besides the understanding of the customer requirements, the seven aspects of 7D planning should be considered completely and planned systematically. The paper makes a detailed expatiation of the 7D planning model of synthesized design method based on systems engineering.
Numerical Simulation of Non-Circular Hole Joint Precision Forming
Authors: Gu Yong Fei , Luo Jun Ting
Published: October 2009

The precision forming technology developed rapidly during passing two decades, however technologies of precision plastic forming the parts with deeper hole are far behind developed countries. The warm backward extrusion-ironing forming technology was presented for precision forming of non-circular hole joint in this paper. The forming process and parameter variable trend were simulated by finite element method, which the software MSC.Marc was applied. The forming die was designed and the forming experiment was finished. The products were deserved with good quality and performance. The feasibility of the forming technology is proved by experimental results and numerical simulation.
Applications of BPNN in Analyzing LHM Elemental Basic Structure
Authors: Yu Jiang , Hong Xiao , Liu Xing Peng , Teng Wei
Published: October 2009

Based on the back propagation multi-layer forward feed neural network, the neural network model is built for the dielectric sensitive structural parameters between the equivalent permittivity and the equivalent permeability, which is used to analyze the basic left-hand materials(LHMS) structural. The experimental results show that the analysis time is 145.535648 seconds and the training mean error is 0.000113426 while adopting the scaled conjugate gradient method. The results are coincident with these ones by the full wave method, satisfying the engineering demand, reducing the faults caused by thickness resonance in the traditional numerical analysis method, realizing the coexistence between the high analysis precision and the high efficiency of the left-hand materials.
Determination of Chip Velocity Field in Metal Cutting
Authors: Bi Xue Feng , List Gautier , Sutter G. , Molinari A. , Liu Yong Xian
Published: October 2009

Chip velocity is a crucial parameter in metal cutting. The continuous variation of chip velocity in primary shear zone can not be obtained from conventional shear plane model. Therefore a general streamline model was used to investigate the distribution of chip velocity field in metal cutting. This paper also verified the continuity of plastic flow in metal cutting by tracing the variation of particle area. The velocity of chip material was calculated from the mathematical expression of streamline model. The velocity results were compared with conventional shear plane model.
Numerical Simulation of the Temperature Distribution during the Metal Laser Sintering of Parts
Authors: Wang Chang J. , Roberts Ibiye A. , Mynors Diane J.
Published: October 2009

The Metal Laser Sintering (MLS) process has been developed over the last decade to produce 3D parts from CAD files using metal powders. A considerable amount of research has been conducted into the melting and solidifying process of metal powders, mainly to predict the temperature distribution in a single metal powder layer or a few layers. The temperature and thermal residual stress distribution in real parts built using MLS has rarely been reported. Finite element simulations of temperature distributions in metal powders and parts requires huge computing resources, this is the main obstacle to successfully predicting temperature and thermal stress distributions in MLS parts. However, from the numerical results in this paper, the periodic nature of temperature distributions in parts around the laser spot can be used to simplify the numerical simulation process to achieve the prediction of temperature and thermal stresses distributions in parts built by MLS.
Investigation of Dynamic Performance of Super-High Speed CBN Grinding Wheel
Authors: Xiu Shi Chao , Cai Guang Qi
Published: October 2009

The dynamic performance of the grinding wheel system is one of the key factors to affect the super-high speed grinding process The excessive centrifugal stress acted on the wheel body can make the wheel rupture due to the super-high rotary speed of the wheel. And the alternating centrifugal force caused by the wheel imbalance can not only make the spindle and bearings vibration and failure, but also lower the machining precision and the wheel life, as well as make against the safety. In this paper, the centrifugal stress of the high speed grinding wheel and its effect on machining process were analyzed by means of finite element analysis and simulation. The alternating centrifugal force and its effect on the wheel spindle system were investigated. Furthermore, the balance precision of super high speed grinding wheel and system was discussed for achieving the high precision, safety and efficiency machining process.
Some Phenomenological Characteristics of Medium-Thick Sheet Metal Extrusion Process
Authors: Zhuang Xin Cun , Xiang Hua , Zhao Zhen
Published: October 2009

The medium-thick sheet metal extrusion has been a typical bulk forming feature used in the sheet metal forming industry while there isn’t enough know-how available. Therefore, the sheet metal extrusion process was simulated in this study by using an arbitrary Lagrangian-Eulerian (ALE) finite element method implemented in MSC. Marc. Firstly, the simulation results are compared with experimental data from a reference to verify the usefulness of the simulation. Then, based on the simulation results, some phenomenological characteristics of the sheet metal extrusion process, such as the material flow, shrinkage cavity and the effect of area reduction on the forming force, are present. The work presented in this paper might be used for as design fundamental of the sheet metal extrusion process.
Assessment and Improvement of Force Computations for Sheet Metal Extrusion
Authors: Zhao Zhen , Zhuang Xin Cun , Xiang Hua
Published: October 2009

On the basis of their similarities with forward rod extrusion, three analytical force computation models are introduced for the forming force prediction of sheet metal extrusion. By comparing with finite element solutions, it has been found that the forming forces obtained by these models deviate at more or less 30% from the numerical solutions under different area reductions. These deviations are due to the neglect of friction or shear force terms in the models. Therefore, a new model, one that fully considers the contributions of extrusion force, shear force, and friction terms to the forming force, is proposed. With tremendous numerical computations, the relationships between forming force and area reduction, sheet metal thickness, and penetration depth, among others are analyzed. Thereafter, the factors in the proposed model are determined. Additionally, a corresponding experiment work has been designed to validate the proposed model. Compared with the experimental results, the predicted results show a relative error of less than 15% under different extrusion ratios, which is acceptable in the industry.
Research on Fine Blanking Process with Stepped-Edge Punch
Authors: Qin Si Ji , Yang Li , Peng Jia Geng
Published: October 2009

The fine blanking process with a stepped-edge punch was researched by finite element method (FEM) and experiment investigation. Finite element analysis showed that the hydrostatic stress of the blank around the edges changes a little during fine blanking process using a stepped-edge punch with negative clearance. The burnish zone of sheared surface increases with the increase of the relative negative clearance. The reasonable forming parameters were presented by a lot of experiment investigations. Parts of three kinds of materials, Q235 steel, copper and industrial aluminum, were formed using fine blanking process with a stepped-edge punch. Full burnish zone were obsearved for all the parts.
Finite Element Analysis of Double Curvature and Large-Area Workpiece in Hot Gas Bulge-Forming of Polycarbonate (PC) Sheet
Authors: Hou Zhen Xiu , Zhang Nan , Liu En Ren , Liu Zhi , Feng An , Wang Zhong Ren
Published: October 2009

To explore geometrical shape, stress distribution, strain distribution and wall thickness of product in the process of polycarbonate hot gas bulge forming, numerical simulation of 4mm PC double curvature and large-area workpiece with the chord 1050mm has been conducted by the finite element software DYNAFORM. The results indicate that the deformation of large-area workpiece starts from blank holder to sheet center, and the maximum latitudinal stress and longitudinal stress is located in the center of PC sheet. The maximum reducing rate is approximate to 6.4%. The experimental results fit well with the numerical simulation.
Manufacturing Errors Effects on Disturbing Torque of Aerostatic Bearings
Authors: Liu Jing Shi , Sun Ya Zhou , Lu Li Hua , Liang Ying Chun
Published: October 2009

In order to improve the drifting accuracy of aerostatic bearings, the manufacturing errors effects on disturbing torque of aerostatic bearings is studied by using the finite element method. The finite element mathematic model of the major influence factors of disturbing torque is established. Then, the finite element equation in the gas film domain is solved and the disturbing torque in the presence of disturbing factors is calculated. The research focuses on elliptical error and prismatic error of journal and incline error of throttle slit. The setting angle of journal, incline position angle of throttle slit and radial eccentricity ratio which affect the disturbing torque is also studied. The results show that roundness error of journal and incline error of throttle slit affect the disturbing torque significantly, that is the greater roundness error of journal and incline error of throttle slit the greater disturbing torque. Disturbing torque is periodic function of setting angle of journal and incline position angle of throttle slit. Radial eccentricity ratio affects the disturbing torque, and there is specific radial eccentricity ratio makes disturbing torque to be extreme point or zero point. In the research, the theoretical disturbing torque value is compared with the experimental value of a certain aerostatic bearing, find that they are on the whole accordant with each other and then prove that the finite element model and the method use to solve the problem is correct. The research is of great significance for designing, manufacturing and assembling aerostatic bearings and for performance prediction of aerostatic bearings.
Study on Kinematics of Shape-Adaptive Tool for Free-Form Surfaces Compliantly Polishing
Authors: Zhan Jian Ming , Wu Ming Ming , Zhang Jian Bo
Published: October 2009

A new free-form surfaces shape-adaptive polishing tool is introduced in this paper, which can change its pose with the surface of workpiece. The simulation of this tool system’s polishing process is taken using ADAMS, and the kinematics of the shape-adaptive tool on the curvature varying surfaces of the workpiece is investigated. The simulating results indicate that the tool system can fit the varying curvature and slope of the workpiece’s surface very well.
Impact Stress Field Simulation on Solenoid Valve during the Impulsive Load
Authors: Jiang Yang , Liu Hong Yi
Published: October 2009

The stress field simulation is carried on to the solenoid valve product during the impulsive load using the ANSYS software in this article, and the stress calculation and fatigue strength assessment to the key dangerous section of valve are done. The result indicates that the dangerous section is proved to satisfy the strength requirement during the impulsive load, and the theory basis has been provided for the further structure optimization design and the performance improvement of solenoid valve.
Vehicle Dynamics Control for Tractor Semitrailer Lateral Stability
Authors: Zhou Shu Wen , Chen Hai Shu , Zhang Si Qi , Guo Li Xin
Published: October 2009

Rollover and jack-knifing of tractor semitrailer on high speed obstacle avoidance under emergency are serious threats for motorists. A tractor semitrailer model was built with multi-rigid-body method in this paper. The steering performance of tractor semitrailer has been analyzed, as well as the stability control theory, including yaw rate following, anti-rollover. The dynamics simulation for yaw rate following and anti-rollover has been performed on the dynamic tractor semitrailer. The results show that the vehicle dynamics control proposed in this paper can stabilize the tractor semitrailer, rollover and jack-knifing are prevented and the tractor semitrailer more accurately follows the driver's desired path.
Dimensional Synthesis of a 2UPS-UPR Parallel Machine Tool
Authors: Zhao Liang , Gong Ya Dong , Guo Jian Ye , Cai Guang Qi
Published: October 2009

This paper deals with the dimensional synthesis of a 2UPS-UPR parallel mechanism tool newly designed by Northeastern University. On the basis of establishing kinematics equations and obtaining Jacobian matrix, the performance index of dimensional synthesis is given which is the average of 729 values of the condition number of Jacobian matrix corresponding to 729 positions in the workspace. With MATLAB software, the effects are simulated which the structural parameters of parallel machine tools have on dimensional synthesis, their change laws are gained, and then dimensional synthesis of parallel machine tools is conducted based on these laws.
Application of FEM Simulation to the Effects of Working Parameters on Isothermal Forging of 7075 Aluminum Alloy
Authors: Wang Wei Wei , Song Jian Li , Luo Shou Jing
Published: October 2009

The influence of process parameters on isothermal precision forging of a screw propeller is studied by means of FEM (Finite Element Method) simulation. The even degree of deformation, distributions of the flow line and effective strain within the billet and the forging load are analyzed. Notable difference of the effective strain is existed between the blades and the wheel hub of the screw propeller. Large deformation of the blade has been obtained, which is favorable for the blade strength. The material flow and the distribution of deformation can be adjusted by changing the process parameters and the forming quality can be improved. Both the forming temperature and punch speed have large influence on the forming load but less influence on the distribution of deformation. The result of simulation shows that the precision forging of screw propellers can be formed with the isothermal precision forging satisfactorily.
Forming 3D Sheet Metals by Means of Continuous Rolling Method
Authors: Hu Zhi Qing , Li Ming Zhe , Gong Xue Peng , Feng Zeng Ming
Published: October 2009

In this paper, we present a novel method of using the continuous rolling to fabricate three-dimensional sheet metal. The core bendable roller is composed of the flexible axis and the controllable equipment. The transversal shape of the sheet metal can be realized by regulating the controllable equipment to make the axis of bendable roller bent; the longitudinal shape is formed by driving the three bendable rollers rotated and the top roller making a displacement synchronously. Some experiments were performed and typical 3D surface parts were formed. Based on the results of the experiments, the effects of the thickness and the rolling times are discussed. The results of the research will be beneficial to define the parameters and perfect the theory of continuous multipoint forming of multiform 3D parts.
Finite Element Analysis of Temperature and Crown of Rolls in Hot Strip Rolling
Authors: Sun Da Le , Zhao Jian Guo , Chen Liang Yu
Published: October 2009

In this paper a three-dimensional numerical computation on temperature and crown of rolls in hot strip rolling was evaluated based on finite element method and parallel computation technology with multiple CPUs. A comparison between calculated results and actual data collected from rolling mills was presented, which indicated the high accuracy of the model. The calculated results indicated that a significant impact in thin layer of work roll surface was brought by thermal load, while much weaker in the core. Furthermore, the temperature field and thermal crown of hot mill work rolls would reach a stabilized condition only when several rolling cycle be finished.
Optimization of Structural Parameter of Shape-Adaptive Tool for Compliant Polishing of Aspheric Parts
Authors: Lv Bi Da , Zheng Di , Zhan Jian Ming
Published: October 2009

The tool position based on the general interpolation arithmetic will make sharp changes which bring a harmful influence to the mixed control of pose and position as well as the normal force in grinding process. In this paper, a new type of shape-adaptive tool is proposed for the common NC lathe. The effective of shape-adaptive and the stability of polishing force is studied utilizing the dynamic analysis software ADAMS, at the same time, the structural is optimized. The simulation outcome indicates that the tool could both adapt to the surface of workpiece and remove the influence brought by interpolation arithmetic.
Thermal Simulation of Peel Grinding Process
Authors: Qiu Jian , Gong Ya Dong , Cheng Jun , Liu Yue Ming
Published: October 2009

This paper describes the grinding temperature characteristics in peel grinding. Some mathematical models such as average heat flux, triangular heat flux distribution and workpiece temperatures in the contact area are built. Using triangular heat flux model, the heat flow transferred to wheel and workpiece are analyzed. A 2D FEM model for thermal aspects of peel grinding process is presented and a finite element algorithm is implemented to solve the nonlinear problem. Finally, a peel grinding thermal field experiment was present.