bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Dynamic Stiffness and Damping of Partial Porous Aerostatic Thrust Bearings
Authors: Sun Ya Zhou , Yu Xue Mei , Liu Hai Tao , Liang Ying Chun
Published: October 2009

Porous materials have been successfully used in an aerostatic bearing. In this paper, the dynamic stiffness and damping of partial porous aerostatic thrust bearings are analyzed by numerical calculation method. Firstly, the pressure distribution function of the bearing is divided into the static and dynamic pressure distribution functions through minor perturbation method. Then, the static and dynamic pressure distribution functions are calculated by FEM. Finally, the dynamic stiffness and damping coefficients of the bearing are solved. The result indicates that the dynamic stiffness increases obviously with the increment of supply pressure and first increases then decreases with the increment of frequency, and that there is negative damping in the low frequency band and the supply pressure has a great impact on the stability of the bearing.
A Study of Formation Mechanism of the Spiral Mark Defect in Cone-Type Rotary Piercing Process
Authors: Huang Hua Gui , Wang Wei , Du Feng Shan
Published: October 2009

The spiral mark is one of the quality defects on the tube surface in cone-type rotary pericing process. In this paper, the numerical simulation study was carried out for cone-type rotary piercing process using rigid-plastic finite element method. From the simulation results, the axial load applied on piercing plug and mandrel bar were then obtained. Taking the elastic deformation of mandrel bar into consideration, the variation of plug location under axial load during pericing process and the non-homogeneous wall thickness were investigated. The formation mechanism of the spiral mark on the tube surface can be found in the obtained results.
Construction of Orthogonal and Symmetric Multi-Wavelets with Vanishing Moments
Authors: Xiao Hong Ying
Published: October 2009

It is a classical result that there is no compactly supported, symmetric, orthogonal univariate scalar wavelet. In this paper, the author aims to obtain multi-wavelets with several good properties. That is, the multi-wavelets are compactly supported, symmetric, orthogonal and have suitable vanishing moments. Firstly, we point out that the orthogonality and symmetry of the multi-wavelets can be obtained if the filter banks are constructed by matrix factorization. Secondly, it is presented how the choices of 2-th real orthogonal matrices matters in the construction. In the end, this paper discusses how the parameters are chosen so that the multi-wavelets will have suitable vanishing moments.
Parametric Design and Development of Standard Mould Part Library Based on UG
Authors: Kuang Wei Hua
Published: October 2009

A large amount of standard parts are usually used in manufacturing enterprises, in order to promote efficiency of product design, establishment of standard part library is very important. It can greatly reduce repetitive design and drafting. UG NX software is used as the platform. The method and step to establish the standard library based on UG/Open API and MoldWizard are studied deeply. The problems such as entry function and how to edit attributes of the standard library are solved eventually. By contrasted with other second development methods, MoldWizard is adopted to establish the enterprise’s standard part library. The design scheme and system architecture of the library are given, and the process of establishing the library is shown by examples. A mould for bottom telephone cover is rapidly designed based on MoldWizard. It proves that standard mould part library can help to improve the drafting efficiency and quality.
Study on Enterprise Integration Platform Based on Web Services
Authors: Gao Li , Meng Xiao Jun , Yu Yong Jin
Published: October 2009

Logical framework of enterprise integration platform is constructed, which is based on the model of user-process-applications. The application systems and business processes are encapsulated by the neutral and standard web services with the support of enterprise applications and database. By using services publishing and discovering mechanisms, enterprise resources can be located and shared. Services within the enterprise can by dynamically orchestrated as processes, so that the enterprise business process can by dynamically constructed and monitored according to the changing environment. Core of the platform is orchestration and management of web services, which is driver by a process engine. The platform is exhibited as enterprise portal supporting single sing-on. An enterprise –wide Kanban system is also incorporated within the platform, covering the enterprise and workshop information. An example is given at the end.
Modeling of e-Manufacturing Information Integration Platform
Authors: He Mo Wei , Liu Yong Xian
Published: October 2009

E-Manufacturing is a new manufacturing concept under current situation. It is the effective enterprise technologies of integrating all kinds of heterogeneous systems from plant floor sources to suppliers and customers by electronic and Web technologies. To achieve this, it needs an information-supporting platform called e-Manufacturing Information Integration Platform, which are the solution facing services. It utilizes Web Services to encapsulate the functions of the basic information systems of manufacturing companies. Those functions become the e-Manufacturing nodes and these e-Manufacturing nodes form an integration platform. At the end, a reference modeling of open e-Manufacturing Integration Platform based on the web services technology is presented. The core concepts of e-Manufacturing Integration Platform are shown. At the same time, the key technologies and implements are researched.
A New Implementation for Ontology Mapping Based Enterprise Semantic Interoperation
Authors: Di Xiao Feng , Fan Yu Shun
Published: October 2009

In the interoperation among enterprises in Business, there is a big problem that different data models and information description are used in different enterprises’ systems which blocking the ambient Semantic collaboration. Ontology is an important tool to overcome syntax and semantic misunderstanding. Our goal is to provide a user-friendly environment supporting syntax and neutral format data model for business information. In this paper, a unified description of data model which mapping from logical data of enterprise’s information system is developed to solve the gap in interoperation. It provides the methods to realize the mapping among serious types of data or information. Firstly, database and other types of information are transformed into neutral format which described by OWL. Secondly, the neutral format can be mapped into the semantic entities and semantic linking through the process of extraction and annotation and added into ontology and been described in a standard method which makes the collaboration could be understood. Lastly, a prototype is described and realized as an integration platform.
Research and Implement of Visual Simulation System for Automobile Gearbox Assembling Line
Authors: Sun Wei , Ma Hui , Li Xiao Peng , Wen Bang Chun
Published: October 2009

Automobile gearbox assembling line is a typical dynamic discrete system. It is very difficult to guarantee the layout reasonability and running reliability of the system with traditional experience design. In the paper, with the given automobile gearbox assembling line, visual simulation was adopted to realize the design and management of the system. The methods of queue-service net and event scheduling were applied on the modeling of assembling line and simulation of running process, respectively. And through the experiments on the system, the optimal number of AGV and reasonable scheduling rule were obtained.
3D Mechanical Models Retrieval Based on Combined Histograms for Rapid Product Design
Authors: Jing Hui , Huang Mei Fa , Li Cong
Published: October 2009

Shape Distribution (3DSD) and Radius Angle Histogram (RAH) are useful methods for retrieving 3D model in mechanical engineering. Through these methods have advantages such as fast speeds and simple operations, the retrieval precision are not very high enough. To improve the retrieval precision, a new method named combined histograms which integrates the advantages of 3DSD and RAH is proposed. This method makes use of the information both of shape and surface of the models to be retrieved. In the retrieval process, the shape histogram and the radius angle histogram of the retrieved model are first extracted. Then, the combined histograms of the model are established by integrating the shape histogram and the radius angle histogram. To validate the proposed method, an experiment is given. The experiment results show that the proposed method has higher retrieval precision than that of 3DSD and RAH and is suitable for mechanical model design.
Pedestal Looseness Fault Analysis of Overhanging Dual-Disc Rotor-Bearing
Authors: Ren Zhao Hui , Teng Yun Nan , Chen Ya Zhe , Wen Bang Chun
Published: October 2009

Looseness fault can occur in rotor part, bearing and pedestal for the vibration caused by alteration of operating craft and inappropriate installation. In the paper, a new pedestal looseness model is proposed by comprehensively considering the advantages and disadvantages of current models of pedestal looseness. By using nonlinear finite element method, the nonlinear characters of overhanging dual-disc rotor bearing for pedestal looseness fault are studied. The work has important significance on safe running and prolonging the life span of machines.
Research on the 3D Model’s Setup of Diamond Manufacturing Center with Fifteen Shafts
Authors: Yan Shi Yu , Wang Hong , Liu Wei
Published: October 2009

This paper describes the 3D model’s setup of diamond manufacturing center with fifteen shafts. It firstly introduces the concept of virtual design and virtual prototype, and common steps for building virtual prototype based on solidworks. Then it introduces the detailed steps of the diamond manufacturing center with fifteen shafts’ 3D model setup which includes parts and assembly. The paper also introduces the analysis of the diamond machine’s movement process. Finally, it gives the conclusion and further research. The research adopts the bottom to top principle and the top to bottom principle.
STEP-Compliant NC Simulation System Modeling
Authors: Zhang Yu , Rauch Matthieu , Xie Hua Long , Zhao Yao Yao , Xu Xun , Liu Yong Xian
Published: October 2009

Although some research and commercial software for NC simulation is available, NC simulation modeling is still not matured. Most of them are based on G&M code. STEP-NC is a new data model for computer numerical control (CNC). It provides rich information for CNC machine tools, i.e. “what to do” based on features rather than “how to do” as for G-code. IDEF0 is a method designed to model the decisions, actions, and activities of an organization or system. It helps to organize and analyze a system and to promote a good communications between the analyst and the customer. So in this paper, from the view of system modeling, function modeling of NC simulation system based on STEP-NC is built by IDEF0 method. As a result, NC simulation system can be realized more efficiently.
Research on CNC Turning System Based on STEP-NC
Authors: Sun Jun , Zhang Xiao Lei , Wang Jun , Song Jun
Published: October 2009

Based on the STEP-NC basic theory, this paper uses the open module design method to construct a kind of CNC turning system based on STEP-NC in the integration environment of VC++6.0 and ST-Developer. The construction of system and processing of the programme and data are accomplished by using MFC class libraries, STIX and ROSE libraries, etc. This paper also studies the key technologies of the system, such as turning feature recognition, STEP-NC interpreter and tool-path generator. In the end, the STEP-NC turning simulative machining platform which can validate the correctness of STEP-NC program machining is constructed by using OpenGL technology.
Supporting Complex Access Control Policy in PDM System
Authors: Ye Chun Xiao , Fu Yun Qing , Xiang Hong
Published: October 2009

Based on previous works, this paper proposed an extended access control model for PDM system. In this model, complex access control policies are expressed and enforced to ensure the security of user role assignment, delegation and revocation of PDM system. To reduce system administrator’s work, the model provides an auto revocation mechanism which can be triggered by time, access control policies and user states. This paper also propose an implementation system architecture, an auto revocation algorithm and some examples to show how this complex policy supported access control model works in PDM system.
Analysis of the Influence of the Restraining Chain on the Posture Error of Movable Platform of Hybrid Machine Tools
Authors: Guo Jian Ye , Hu Ming , Zhao Liang , Liu Yong Xian
Published: October 2009

This paper takes one kind of 3-TPT Hybrid Machine Tools (HMT) as the object to study. It mainly analyzes the influence of the parallelogram mechanism as the restraining chain of machine on the posture error of movable platform. Firstly, on the basis of introducing the structure of HMT, the kinematics of the restraining chain of this machine is analyzed, and the kinematics equation of the restraining chain is established. Secondly, the influence of two kinds of factors including the shape error of parallelogram mechanism and the micro-rotation of Hooker joint around the axis of connecting rod is analyzed respectively, and the theoretical relationship expression is acquired between various errors influencing factor and the posture error of movable platform, thus the foundation for the theoretical error analysis of the HMT is laid.
Modeling and Simulation of Dynamic Alliance Task Scheduling
Authors: Huang Bin , Gao Cheng Hui , Chen Liang
Published: October 2009

Considering the characteristics of dynamic alliance task scheduling, timed place Petri-net (TPPN)-based approach is proposed to model the task scheduling. On the basis of formal definition and transition rules of the TPPN, dynamic alliance manufacturing types are classified, and the TPPN model of each kind of manufacturing is provided. Then through analyzing time difference of each task, critical path in TPPN model is solved. Finally, State flow is used to simulate the TPPN model, and the simulation of a case demonstrates that the approach is feasible and effective.
Erection of Upper Ontology and Enrichment of Knowledge Base of Production Workshop in Manufacturing Enterprises
Authors: Shi Chun Jing , Liu Yong Xian , Hao Yong Ping
Published: October 2009

After the business model and the ontology meta-model of production workshops are analyzed and the business processes of the workshop are described formally, the upper ontologies are built on the basis of the business process, and are used to derive the domain ontologies in the workshops. Using SWRL to extend ontologies with rules overcomes the expressive limitation of ontologies. The system architecture of the manufacturing knowledge generation based on rules is put forward. Finally an example is used to explain the process of knowledge generation based on the rules.
A Two-Stage Cell Formation Approach with Machine Performance
Authors: Cao Le , Li Shu Ge
Published: October 2009

Cell formation which involves grouping similar parts into part families and the corresponding machines into machine cells is one of the key research issues for designing cellular manufacturing system. Functionally identical machines may vary in production performance. In the paper, processing cost is employed to differentiate the performance of machines, and a two-stage cell formation approach for manufacturing systems with multiple functionally identical machines is proposed. With this approach, parts are firstly clustered into part groups based on process similarity; secondly, machines are then assigned to part groups according to their performance to form manufacturing cells. A heuristic algorithm based on process similarity is presented for part group identification, and a mathematical model with the objective of minimizing the total processing cost is established. An example is employed to illustrate the benefit of the proposed approach and the results suggest that the proposed approach is feasible.
Research of Flexible Dynamic Scheduling Problem Based on Genetic Algorithm
Authors: Wu Yu , Zhuang Xin Cun , Li Cong Xin
Published: October 2009

Solve the flexible dynamic scheduling problem by using “dynamic management & static scheduling” method. Aim at the property of flexible Manufacturing systems, the dynamic scheduling methods are analyzed and a coding method based on working procedure is improved in this paper. Thus it can be efficiently solve the problem of multiple working routes selection under the active distribution principle. On the other hand, the self-adaptive gene is provided and the parameters of the genetic algorithm are defined. In such a solution, the scheduling is confirmed to be simple and efficient.
Study and Execution of Advanced Batch Production Planning System for an Aerospace Industry
Authors: Younus Muhammad , Yu Yong , Lu Hu , Fan Yu Qing
Published: October 2009

Modern manufacturing industries are increasingly faced with international competition and fluctuating market conditions in the age of globalization. In striving to remain competitive, manufacturing industries must deliver products to customer at the lowest cost, at the best quality and in the minimum lead time. As a result, it becomes mandatory to design and implement the advance production planning and scheduling system that supports shorter product cycles despite more complex and specialized manufacturing processes. The advance production planning and scheduling system provides the leaner production strategies and real time information throughout the industry. This paper presents an appropriate Advance Production Planning and Scheduling Software System for a batch production aerospace manufacturing industry. The Software system receive the customer‘s order and perform material requirement planning using software. The software system sends procurement requisition to the procurement department for the materials which is not available in the store for manufacturing of parts. It issues release order to the store section for the issuance of material to the manufacturing shops. It also issues weekly and daily plan with production schedule to the manufacturing shops. It also issues work orders to the production shops for the manufacturing and assembly of the parts. On the completion of the product assembly, proper closing of the work orders has to be done and product may deliver to the warehouse for further handing over to the customers. In case of modification of order by the customer, the Software System will automatically update the relevant data.
An Intelligent Control System for Digital Workshop Production
Authors: Cao Ju Jiang , Li Yan
Published: October 2009

In general, production control of digital workshops is a complicated systematical engineering. Because of lacking the methods and means of acquiring the manufacturing data in real time, the traditional production control methods cannot satisfy the real production control requirement of digital workshops. In this paper, we put forward an intelligent control system for digital workshop production. The main contributions include three aspects: Firstly, we introduce and adopt Radio Frequency Identification (RFID) technology as a means to acquire the manufacturing information in real time produced by the bottom-level manufacturing devices. Secondly, we develop the wcPML (workshop control with Physical Markup Language) and utilize it to act as a media to realize the information visualized description and transmission between the top-level control systems and bottom-level manufacturing sites of workshops. Thirdly, we adopt Java Web technology and wireless LAN to build the infrostructure for the intelligent control system for workshop production. Some key enabling technologies for the intelligent control system also are presented and described following with some concluding remarks.
Constructing a Web-Based Fuzzy Expert System for Aeroengine Fault Diagnosis
Authors: Wang Jian Rong , Zhang Yang , You Tian Yu , Hou Shou Ming , Wang Wan Shan
Published: October 2009

Based on the analysis of current state of aeroengine fault diagnosis, this paper proposes the design and implementation of a web-based fuzzy expert system called WFESAFD, which is focused on the monitoring and fuzzy fault diagnosis of aeroengine. The system architecture and its components, such as web interface layer, monitor, knowledge acquisition and management, integrated data base, reasoning mechanism and knowledge base are illustrated. The detail process of system implementation and practical applications of WFESAFD are presented to illustrate and prove the proposed system’s applicability. Running results show the feasibility and reliability of the framework, which will be helpful to integrate the aeroengine diagnosis knowledge, improve the diagnosis efficiency and decrease the aeroengine diagnosis cost remarkably.
Study on Knowledge Base Construction for the Network Teaching Resource Based on Semantic Web
Authors: Gan Jian Hou , Yuan Ling Yun
Published: October 2009

Intelligent teaching system design has become an active research topic in education research community. How to manage the network teaching resource efficiently will have a direct impact on the teaching process and quality in the network teaching system. The semantic web can be a very promising platform for knowledge management systems in the intelligent teaching system design. In this paper, we have presented a framework for the network teaching resource knowledge base (NTRKB) based on semantic web, which includes network teaching resource knowledge representation, regular relation definition based on OWL, knowledge base modeling and construction based on RDF. The NTRKB can achieve knowledge sharing and intelligent retrieval for the network teaching resource, and these components will greatly benefit the development of the proposed intelligent teaching system.
Virtual Prototyping of Belt Conveyor Based on Recurdyn
Authors: Hu Kun , Guo Yong Cun
Published: October 2009

The virtual prototyping (VP) technology is a new method for belt conveyor dynamic design. However the conveyor belt simulation is very difficult. There is no successful precedent of belt conveyor VP until now. Based on a new type of dynamic software – Recurdyn, the VP design plan is formulated, which comprises simplification of belt conveyor, 3D modeling, belt separation and belt blocks assembly. Then a simplified belt conveyor VP is given. The VP is simulated under working condition in virtual environment. The results show the correctness of simplified VP and the feasibility of heavy-duty belt conveyor VP. And an improved belt conveyor VP which can be used in design and research is completed in the end.
Study of Toleranced Products Modeling Based on Virtual Reality
Authors: Cui Gang Wei , Yao Ying Xue , Wang Yu
Published: October 2009

Virtual assembly based on the virtual reality gives a low-cost and rapid prototyping method for products’ assembly, and tolerances have become a key technique of information integration in CAD/CAM. It will be a new task about how to integrate tolerances into virtual assembly. A toleranced product model based on the virtual reality is constructed for the virtual assembly, and the essential data is saved and managed in database. Model transform interface software is developed, which is a special software that users can get the essential data without any users’ acting. The geometric model of products is constructed in the virtual reality, and the method of getting assembly information, dimensions, and tolerances is proposed. A toleranced product modeling system based on the virtual reality is developed, and the using of tolerances is discussed by an example.
Stiffness Analysis of 3-RPR Planar Parallel Mechanism to the Stiffness Control
Authors: Li Shu Jun , Gosselin Clément
Published: October 2009

The analytical stiffness equations of the 3-RPR planar parallel mechanism are derived in this paper based on the Conservative Congruence Transformation (CCT) stiffness matrix proposed in [1-3]. Stiffness maps of the 3-RPR mechanism are plotted in order to show the behaviour of the stiffness with and without external forces. The stiffness characteristics of the mechanism are analyzed and discussed in details. Numerical examples show that the stiffness in x and in y are well balanced, while the stiffness in tends to be lower.
Analysis and Optimization on Impeller Assembly Structure
Authors: You Xiao Mei , Meng Lei , Dai Ji Shuang , Wen Bang Chun
Published: October 2009

Complete contact is often used in assembling wheel hub and shaft which are used in the closed impeller assembly group of large turbine compressor. The interference is usually fixed. In the topic, based on the nonlinear contact theory and FEM, an impeller assembly is studied from finishing assembly to steady state, then the size and distribution of stress of the contact area between wheel hub and shaft is gotten. Then a structural optimization on the assembly is done. The stress distribution is changed reasonably when the structural redundancy is reduced. Then the incidence of shaft bending is reduced effectively and assembling performance of the impeller assembly structure is improved, the results can be used to offer reference for the design and manufacture.
Analysis of Key Technologies for Aeroengine Maintenance Based on Virtual Reality
Authors: Shi Hong , Xiang Song , Wang Jing
Published: October 2009

The virtual maintenance technology based on the virtual reality technology has changed the traditional single-site maintenance means, and also overcame the shortcoming of manufacturing cycle length, high cost, and difficult to amend for the physical prototype. Furthermore, it can expose the problem during the early design. The key technologies of virtual maintenance include the maintenance process model, virtual maintenance prototype, virtual maintenance simulation, analysis and evaluation of maintainability. In this paper, the research object is aeroengine.The key technologies of virtual maintenance were analyzed.
Multi-Body Dynamic PD Control of Concrete Pump Truck Arm System
Authors: Dai Li , Wang Jian , Zhao Bo , Liu Jie
Published: October 2009

For the concrete pump truck, the movements of the arm and the hydraulic cylinder are analyzed respectively with multi-body dynamic theory. And with the applying of PD control theory, the dynamic equation of arm system is also built. And according to the numerical solution of the equation, it is proved that the dynamic equation can describe every dynamic character of the concrete pump truck well.
Initiative Design of Tooth Profiles with Small Sliding Coefficients
Authors: Wang Jian , Luo Shan Ming , Zhu Shi Min
Published: October 2009

This research aimed to propose an initiative design method for tooth profiles based on the given small sliding coefficients. A simplified derivation of the mathematical model of tooth profiles is presented. A design example is provided to illustrate the approach. The results show that tooth profiles designed by the proposed method have the small sliding coefficient. It is significant to improve the wear and friction properties and raise the life span of gears.
A Sort-First Parallel Rendering System for CRH3 Virtual Assembly
Authors: Zhou Shao Ze , Zhao Wen Zhong , Ma Si Qun
Published: October 2009

Towards the large models of complex industry products, parallel rendering is often adopted to increase the resolution, performance and scalability for 3D product visualization. In this paper, we are targeting the interactive visualization of the complex CRH3 product assemblies in a virtual environment. To render CRH3 model and assembly animation, a PC Cluster-Based sort-first parallel rendering system for virtual assembly is presented and some combined strategies are discussed. With this approach, our experimental results show that high resolution display and parallel speedup with relatively low overhead in CHR3 virtual assembly can be achieved.
The Static and Dynamic Stiffness Analysis and Strengthening Design of Internal Grinder Sharper Based on the CAE
Authors: Wang Zhong Hou , Li Ke Song , Zhou Xiao Ling , Zhao Dong Sheng , Xie Yun Bo
Published: October 2009

Using software Pro/E and Pro/MECHANICA of the PTC, a method that establish a precise geometry and physical model(virtual prototyping) for the grinding tool of internal grinding machine, and simulate the dynamic and static characteristics of this virtual prototyping is introduced. Through simulation analysis, the weak links of the original design was found, thenthrough intensive design the static stiffness of the grinding tool increased two times, and the first stage of the inherent modal frequency was increased by 25%. Moreover, vibration dynamic response on nodular cast iron and steel shown the quantitative analysis results that nodular cast iron has good damping effect. Put the technology to practical application, the processing defects—chatter marks of surface quality when grinding round obtain a fundamental solution.
Study on Vibration Friction Mechanism and Vibration Response Analysis Based on Vibration Compaction System
Authors: Teng Yun Nan , Li Xiao Peng , Ma Hui , Wen Bang Chun
Published: October 2009

Friction of two objects or inner friction of loose materials in vibration case can present different characteristics that are different from conventional conditions. The practice shows that vibration can reduce friction coefficient and friction force between two objects, lighten abrasion of objects, reduce energy consumption and increase greatly working efficiency. The mechanism of friction in vibration case was revealed in this paper. The Curve of vibration intensity to internal friction of soil was given. The investigation indicated that friction converts from static to sliding in vibration case. The internal friction is reduced with frequency increasing and there exists the optimal vibration intensity to make internal friction least. At last, nonlinear dynamic model of vibration friction system about compaction equipment was established and its resonance response was obtained.
Mandibular Virtual Reconstruction Surgery Guided by Mimics
Authors: Wu Wen Zheng , Qin Xing Jun , Zhang Yang , Wang Wan Shan
Published: October 2009

Aiming at a clinical case of a 52-year-old male patient, the patient’s mandible will be 3 Dimensional (3D) reconstructed and the surgery will be planed. This patient who suffered from mandibular tumor needed to undergo surgery. This study used a Toshiba 64-row Spiral CT to scan patient’s maxilla and mandible. 368 layers consecutive maxillary and mandibular CT images which scanning slice thickness is 1mm were obtained. The original images which format were DICOM were import to Mimics. After decided the bone threshold value the contour lines of every layers were extracted. Every image was passed the processing steps of edge division, selective editing, filling holes, wiping off redundant data and 3D reconstruction. After these steps the 3D geometric model of maxilla and mandible was obtained. The dimension of mandibular tumor and accurate location of the removal part were determined. These steps provide accurate original data for the manufacture of mandibular Rapid Prototyping (RP) model.
Study on the Nonlinear Characteristic of a Rotor-Bearing System between the Continuum Model and Discrete Model
Authors: Li Chao Feng , Sun Wei , Liu Chen Yi , Wen Bang Chun
Published: October 2009

The nonlinear dynamic behavior of a rotor-bearing system is analyzed with its finite element model based on the analysis of the discrete model, with considering some other important influencing factors such as, material damping, gyroscopic effect, inertia distribution, shear effect and so on, which make the description of the system more embodiment avoiding the casualness of selection with system parameters. With the comparison of the results on the bifurcation map and three-dimensional spectrum, significant difference is appeared with the addition of the considered factors. It is suggested that the substitution of continuum model for the discrete ones can get more accurate and abundant results. Furthermore, these results can provide more accurate verification and reference for the experiment and nonlinear dynamic design of the complex rotor system.
Aerodynamic Numerical Simulation in the Process of Car Styling
Authors: Zhang Ying Chao , Zhang Zhe , Luo Shuang Hu , Tian Jian Hua
Published: October 2009

With the development of automotive industry of China, more and more new cars are brought out. Then more and more stylists and engineers will take part in car styling to design new car. In the process of car styling, Car aerodynamics is important to its performance. Especially for more excellent handling and stability performance, more aerodynamic analysis and optimization should been done.
At first it was introduced that the process of car styling in this paper. The functions of aerodynamics in the process were indicated. Secondly some ways of aerodynamic analysis were put forward. The first one is wind tunnel test and the second one called virtual wind tunnel test.
The virtual wind tunnel test is one of the best modern ways of aerodynamic design which apply in the fields of aerodynamic research widely. It was based on computational fluid dynamics. The details of the virtual wind tunnel test simulation were narrated in this paper. Applying the virtual wind tunnel test aerodynamic drag coefficient, velocity contour and pressure distribution were got. Some advices to reduce aerodynamic drag of the design car were put forward.
In one word, it is one simple, effective, convenient and fast way for aerodynamic design in car styling process using virtual wind tunnel test.
Nonlinear Finite Element Analysis and Test of Lateral Loading for Two-Post ROPS
Authors: Wang Ji Xin , Yang Xun , Yu Xiang Jun
Published: October 2009

According to the structural characteristic and the test requirement of tow-post ROPS, a nonlinear finite element model of ROPS based on large-strain shell element was established, and the influence of elastic-plastic deformation of ROPS was taken into consideration. Then the computer simulation of ROPS was performed in lateral loading case, which obtained the deformation mode and the distribution law of equivalent plastic stress of ROPS followed by the discussion of deformation mechanism of ROPS. The simulation results accorded with test results. This paper can provide theoretical basis for the structural design of two-post ROPS.
Research of the Virtual Prototyping Technology Based on Laser Processing
Authors: Wang Zhi Jian , Shang Xiao Feng , Wang Xiao Yan
Published: October 2009

At present, laser processing has been widely used, but the traditional laser processing can not rapidly adapt to current market demands, so the virtual prototyping technology based on laser processing is put forward. In this paper, the research status of the virtual prototyping technology based on laser processing is summarized and the structure figure of laser processing virtual prototyping system is established. Then the virtual prototyping technology based on metal part direct rapid prototyping is studied, which includes the structure parameterization designs of coaxial powder feeding device and powder nozzle and the simulation of the gas-solid two-phase flow in the coaxial powder feeding device and the temperature distribution during the deposition process of metal powder.
Vehicle Dynamics Control Based on Linear Quadratic Regulator
Authors: Zhang Si Qi , Zhang Tian Xia , Zhou Shu Wen
Published: October 2009

The paper presents a vehicle dynamics control strategy devoted to prevent vehicles from spinning and drifting out. With vehicle dynamics control system, counter braking are applied at individual wheels as needed to generate an additional yaw moment until steering control and vehicle stability were regained. The Linear Quadratic Regulator (LQR) theory was designed to produce demanded yaw moment according to the error between the measured yaw rate and desired yaw rate. The results indicate the proposed system can significantly improve vehicle stability for active safety.
Service-Driven Networked Collaborative Manufacturing Execution Platform for Extended Enterprises
Authors: Wang Qi Feng
Published: October 2009

To effectively realize the collaboration in manufacturing processes for extended enterprises, this paper provided a service-driven networked collaborative manufacturing execution platform and its framework based upon the analysis of requirements for networked collaborative manufacturing, and the components of the platform were deeply studied. Furthermore, the collaborative operation processes were studied from three processes which include the process of manufacturing resource services modeling and register, the process of manufacturing task committing and manufacturing execution chain generation, and the process of manufacturing execution chain execution and monitoring. The study of this paper provided a feasible system and operation mode for the extended enterprises in manufacturing process collaboration.
Network Security Prevention Model Based-Immune
Authors: Jiang Ya Ping , Cheng Shi Hui , Gan Yong
Published: October 2009

With the concepts of self, nonself, antibody, vaccine and antigen in an intrusion detection and prevention system presented in this paper, the architecture of network intrusion and prevention based on immune principle is proposed. The intrusion information gotten from current monitored network is encapsulated and sent to the neighbor network as bacterin; therefore the neighbor network can make use of the bacterin and predict the danger of network. The experimental results show that the new model not only actualizes an active prevention method but also improves the ability of intrusion detection and prevention than that of the traditional passive intrusion prevention systems.
Fault Diagnosis of Roller Bearing Conditions Using ANFIS
Authors: Sui Wen Tao , Zhang Dan
Published: October 2009

This paper presents a fault diagnosis method on roller bearings based on adaptive neuro-fuzzy inference system (ANFIS) in combination with feature selection. The class separability index was used as a feature selection criterion to select pertinent features from data set. An adaptive neural-fuzzy inference system was trained and used as a diagnostic classifier. For comparison purposes, the back propagation neural networks (BPN) method was also investigated. The results indicate that the ANFIS model has potential for fault diagnosis of roller bearings.
Research on the Application of Secondary Regulating Technique in Loader Transmission System
Authors: Zang Fa Ye , Shan Shao Fu
Published: October 2009

Hydrostatic transmission with secondary regulation is a new kind of hydrostatic transmission, which can regenerate inertial and gravitational energy of load. The structure and working principle of double-action vane-type secondary element was introduced. Based on deeply analyzing the working principles and energy-saving theory of loader secondary regulating transmission system，regenerating the transmission system’s inertial energy by controlling constant-power was put forward. Considering large changes of the parameters of the transmission system and its non-linearity, a fuzzy control was adopted to control the transmission system, and the mathematical model of the system was established, then the simulations of the performance of the transmission system has been conducted. It has come to an conclusion that the transmission system’s braking by controlling constant-power is reliable and stable at definite power, it can also permits changing the efficiency of recovery by changing the power, and the inertial energy can be reclaimed and reused in the system by the application of the secondary regulation technology
Robot System to Detect Line Based on ARM9
Authors: Xia Peng , Hao Wei Dong , Yu Xiao
Published: October 2009

In this paper, a new system of visual detect line robot based on CMOS image sensor was designed. Meanwhile a new technology to detect line was proposed and designed. The system includes nuclear module, image collecting module, robot orientation module, electromotor drive module, man-computer interaction module and power supply module. The principle, function and implementation of every module were introduced in detail. Results of experiments show that the system has not only strong real-time capability and high accuracy, but also outstanding stabilization.
Adaptive Fuzzy PID Designed for Solenoid Valve Test System
Authors: Guo Bei Tao , Liu Hong Yi , Jiang Yang , Wang Fei , Luo Zhong
Published: October 2009

The performance of solenoid valve is directly related to the security and reliability of industrial system. This paper presents the design of the automatic test platform for solenoid valve. The architecture of the hydraulic subsystem and the control model of providing precise pressure for testing solenoid valve were built up. A self-adaptive fuzzy PID controller, which can dynamically modify the controller’s parameters by using fuzzy rules presented in this paper, was designed with considering the dynamic characteristics of hydraulic system. Simulation results show that the self-adaptive fuzzy PID controller, which compared with conventional PID controller, can obtain better dynamic performance and fast response.
Vision Monitoring Algorithm for Work Condition of NC Processing
Authors: Zhang Yuan , Kang Shao Chen , Wang Peng , Yin Shi Wei
Published: October 2009

Aim at the problem of work condition monitoring in high speed NC processing, a new method is proposed based on video analysis technology. It puts forward a segmentation model with maximum a posteriori and Markov random field for NC processing image sequence. Moreover, the best segmentation is obtained by optimization immunity algorithm to monitor tool and work piece effectively. The experiment shows that this method can achieve accurate and real time monitoring and demonstrate the validity and robust of the solution for barrier work piece.
Research on Fuzzy-PID Control for a Tension System of Rotary Magnetorheological Damper
Authors: Hu Li Yong , Chen A Liang
Published: October 2009

A rotary MRF (magnetorheological fluids) damper is introduced in tension control systems. An experimental tension control system is designed by using the MRF damper as tension control actuator. Control strategies of the tension control system are studied. A fuzzy-PID feedback controller for the tension control system is constructed and tested, where the variable parameters of the PID were modified by using the fuzzy inference rules. Experimental results indicate that the fuzzy-PID control strategy can be used in the tension control system to get better performance than the conventional PID control strategy.
Controller Design of Output Feedback MIMO Networked Control Systems with Multiple Packet Transmission
Authors: Xie Cheng Xiang , Hu Wei Li
Published: October 2009

MIMO (mult-input multi-output) networked control systems (NCSs) with multiple packet transmission is considered. The network-induced delay is assumed to be time-varying and less than one sampling period. Suppose the data of sensor node is part of system outputs and is transferred with static scheduling strategy, then the NCS is modeled as uncertain periodic system. The uncertain periodic system theory is used for the stability sufficient condition. Then a control design approach is presented via bilinear matrix inequalities (BMIs) method. The simulation result shows the effectiveness of the proposed approach.
Based on WLAN for Tower Crane Fleet Communication System
Authors: Zheng Xi Jian , Li Lin , Fei Ye , Xie Zheng Yi
Published: October 2009

In this paper, WLAN is used to design tower crane fleet of wireless communication systems, through several performance tests to obtain a low-cost wireless bridge and actual operating parameters. The theory of computation and analysis of the environment is used to sum up focusing problem with setting up the tower crane fleet WLAN system. The results create a new direction for tower crane fleet information management.
Determination of Material Parameters in the Chaboche Unified Viscoplasticty Model
Authors: Gong Yun Peng , Hyde Christopher , Sun Wei , Hyde Thomas H.
Published: October 2009

An experimental programme of cyclic mechanical testing of a 316 stainless steel, at temperatures up to 600°C, under isothermal conditions, for the identification of material constitutive constants, has been carried out using a thermo-mechanical fatigue (TMF) test machine with induction coil heating. The constitutive model adopted is a modified Chaboche unified viscoplasticity model, which can deal with both cyclic effects, such as combined isotropic and kinematic hardening, and rate-dependent effects, associated with viscoplasticity. The characterisation of 316 stainless steel is presented and compared to results from cyclic isothermal tests. A least squares optimisation algorithm has been developed and implemented for determining the material constants in order to further improve the general fit of the model to experimental data, using the initially obtained material constants as the starting point in this optimisation process. The model predictions using both the initial and optimised material constants are compared to experimental data.
Design and Research on the Mechanical Adaptive In-Pipe Robot Drive Unit
Authors: Jiang Sheng Yuan , Jiang Xu Dong , Zhang Xue Wen , Li Jian Yong
Published: October 2009

A novel differential in-pipe robot, called mechanical adaptive in-pipe robot is presented. The drive unit of the robot consists of driving module characterized by tri-axis differential velocity mechanism, and elastic leg-wheeled in-pipe adaptability module characterized by fully active drive. The drive module, as a result of its automatically modulating every moving wheel rotation speed according to topological constraint by in-pipe, avoids parasite power as a result of moving wheel slippage. The elastic leg-wheeled in-pipe adaptability module is adjustable to inner diameter variation by its radial protraction and shrinkage, and its fully active structure ensures enough tractive force even if several moving wheels impended. Therefore the mechanical adaptive in-pipe robot provides a novel insight to differential-typed in-pipe robots with the mechanical adaptive performance, and is supplementary with its novel configuration and transmission principle.
The Research on Blunting Control Strategy of Throttle Signal during Auto-Shifting Process
Authors: Gong Peng , Zhao Li Jie , Chen Hui Yan , Xi Jun Qiang
Published: October 2009

It is easy to make sudden shifting process during automatic shifting due to the driver’s sudden pedal operation. According to the analysis of sudden shifting process, the method of blunting throttle signal is put forward and corresponding control strategy is established. Not only the sudden shifting phenomenon is avoided effectively, but also there is no influence to the normal driving condition.
The Application of Optical Rotation Principle in Density of Oil Mist Measuring
Authors: Chen Jian Wen , Jia L.B. , Song Jin Chun , Zhang Zhi Wei , Pang C.J.
Published: October 2009

The density of oil mist in this paper is an important factor of oil mist lubrication technology, according to which the effect of lubrication will be known and from which the study on atomization effect will also benefit. In general, the oil mist density of oil mist lubrication system in working condition is 3-12g/ m3 , the median diameter is 1-3 [1], which is difficult to measure with conventional detection methods. The paper takes advantage of optical rotation principle as a measuring method for density of oil mist and achieves a good experimental result.