bluuebunny/crossref_metadata_2025 huggingface dataset:
Open Architecture of Robot Control System Based on PROFI-BUS
Authors: Tan Xiao Dong , Tan Feng , Zhang Kun , Li Bao Liang
Published: October 2009

A PROFI-BUS based industrial robot control system is introduced from the viewpoint of both software and hardware. It is discussed about how to use PC technology and field-bus technology to design an open robot control system. The system adopts a three- layer structure, which is mainly configured with universal control devices, to realize a modular and universal design. A high-speed field-bus is designed for connecting servo system and IPC, to ensure real-time capability; another low-speed Field-bus is used to connect IPC and PLC, HMI, teaching panel and other devices for data exchange, while reducing the occupancy of system resources. The software system adopts the modular design with Windows NT and RTX, which fully exploits the powerful functions of Window NT system and meets the requirements of real-time system. This open structure greatly enhances the system's flexibility and openness.
Simulation and Research of the Space 5-DOF Manipulator Kinematics and Dynamics
Authors: Li Li Quan , Wang Jin Li , Pang Yong Gang
Published: October 2009

Kinematics and dynamics calculation is meaningful both in the design stage and the movement control stage of a manipulator. After the comparison among different methods of manipulator kinematics and dynamics，this paper adopts homogeneous coordinate transformation to analyze and research positive solutions of the space 5-DOF manipulator kinematics, applies mathematics in the approximate calculation to solve the equations’ inverse problems because of the explicit difficult nature to derive analytic solution; conducts dynamics analysis to the manipulator and adopts the Lagrange dynamics method to establish an ideal model, i.e., a dynamics model integrating with corresponding computer algorithm without considering the influences of friction force, to complete the research on the simulation calculation of dynamics inverse solution.
A Measurement Fusion Fault-Tolerating PID Control for Time-Delay System with Colored Noise Disturbance
Authors: Wang Xin , Zhu Qi Dan , Wu Ye Bin
Published: October 2009

The designing method of filtering, fault-tolerating, and fusing PID control is put forward, concerning multisensor time-delay system with colored noise disturbance. First of all, this method detects fault and isolate the data by the weighted square sum of residuals (WSSR) method which is measured by multisensors, then the data which is detected right will be measurement fused, and the fused data will be optimally filtered basing on modern time series analysis method. Finally, the global optimal estimation of measured data will be got, which will be brought back to the input endian in order to improve PID controlling accuracy. A 3-sensor servomotor control example shows the effectiveness of the method.
Stabilization Control of Nonholonomic Wheeled Mobile Service Robots
Authors: Chang Jiang , Meng Qing Xin
Published: October 2009

Nonholonomic wheeled mobile service robot’s posture error model denoted by polar coordinates in global coordinates is established .Based on the inherent discontinuousness of the closed-loop system model, a novel nonlinear state feedback stabilization control law is proposed，which causes closed-loop system state space equation of robot to have isolated equilibrium state at origin. By Lyapunov candidate function method，this paper concludes that the closed-loop system is global uniformly asymptotically stable at origin. Simulation results indicate that the proposed control law is effective.
Configuration Design of a Novel Mobile Robot with 5th Wheel
Authors: Xu He , Tan Da Wei , Zhang Zhen Yu , Xue Kai , Luan Yun Kun , Peng Gao Liang
Published: October 2009

A mobile robot prototype with independent propulsion and individual steering and a 5th steerable propulsive wheel has been developed. Different prototypes with diversified wheelbase, wheel stance, clearance, stability margin, altitude of center of gravity and 5th wheel posture can be achieved by reconfiguration. And a special prototype has been made to deal with the situation that the robot will go on traverse after it is flipped over.
Mobile Platform of a Rocker-Type W-Shaped Track Robot
Authors: Li Yun Wang , Ge Shi Rong , Zhu Hua , Fang Hai Feng
Published: October 2009

Based on the configurations of the track type travel mechanism, instead of wheels, the tracks were introduced into the rocker-type robot mobile system, and various configurations of the rocker-type track suspensions were obtained. Through analyzing characteristics of the suspensions, a rocker-type unsymmetrical W-shaped track mobile system was presented. The rear main tracks of the W-shaped tracks were longer than the front ones. The prototype’s obstacles-surmounting capabilities including ditch-crossing, step and stairs-climbing were analyzed. The prototype could climb up a 320mm-high step, climb down a 520mm-high step, cross a 490mm-wide ditch. The capabilities analysis and prototype test results indicated that the rocker-type unsymmetrical W-shaped track mobile platform had excellent passive adaptability to rugged unstructured terrain environments and strong obstacles-surmounting capabilities.
Fuzzy Design Scheme Selection Method Based on QFD Integrated with TRIZ
Authors: Qiu Chang Hua , Liu Shang , Shi Dong Yan
Published: October 2009

A new framework of decision-making is proposed in this paper to accommodate the application of quality function deployment (QFD) integrated with TRIZ. In the proposal framework, Ideal Final Result (IFR) oriented decision-making process is introduced for the innovation design process in order to select the best solution from alternatives which are generated by TRIZ and consistent with the laws of technical system evolution. Overall customer satisfaction oriented decision-making process is applied for the alternatives generated from both innovation design process and adaptive design process. The correlation matrix, which affects the weight of criteria, is modified according to the style of broken contradiction for the application of TRIZ. Meanwhile, triangular fuzzy numbers are utilized to deal with vagueness of human thought. Finally, an example is taken to show application of the framework.
Design and Affect about Parameter to Capability Research on Driving Device of Puncturing Mud Robot
Authors: Zhang Zhong Lin , Wang Li Quan , Ye Xiu Fen
Published: October 2009

Puncturing mud robot is a kind of trenchless device that can walk by itself in the earth. There are abroad appliance foreground and developing value as it can mainly pave PE pipe,PVC pipe,cable and optical fiber cable under the mud. Through researching on impacting construction of steerable air-powered impact mole in trenchless technology at home and abroad, the driving device of puncturing mud robot was designed. The device machinery character and work principle is recounted and device three-dimensional model was established and device virtual assembly was finished. The parameter equation of driving device was educed and effect from main parameter to output capability was analyzed. Based on analysis result, testing of impacting capability about driving device was put up and the academic result of the impacting capability was validated. The testing result indicates also that this driving device can meet puncturing power need. This paper can provides reference for collectivity design of puncturing mud robot.
Vibration Control of Nonholonomically Redundant Flexible Manipulators
Authors: Chen Wei , Yu Yue Qing , Zhao Xin Hua , Zhao Lian Yu
Published: October 2009

Underactuated flexible manipulator with redundant degrees of freedoms is investigated. Position control method of a single active joint driving the passive joint is given. According to the characteristics of nonholonomiclly redundant flexible manipulators, the optimal control strategy of multiple active joints driving the passive joints is proposed. As the elastic vibration of flexible links can not be eliminated only through position control, the vibration control schemes are presented again. The simulation results show that the elastic vibration is suppressed effectively. Therefore, for nonholonomically redundant flexible manipulator, both position control and vibration control are implemented successfully, which verifies the validity of the control schemes.
The Automatic Spraying in the Realization of Complicated Surface Coating
Authors: Xu Ze Ning , Yu Xiao Guang , Dong En Yong , Zheng Wen Guang , Mao Zhong Xian
Published: October 2009

The product surface coating is a very essential working procedure, especially the complicated surface coating thickness even directly influences outward appearance of the product. Therefore the high request to the surface coating craft is set. To adjust the spray gun's spraying angle and the flow of coating freely is needed. In order to meet complicated surface automatic spraying needs,the invention is based on the PLC complicated surface automatic spraying system, whether in the research and development of the mechanical device or in the design of control system, that the system of mechanical and electrical integration has satisfied request of the automation has been proven after the production examination.
Research on Moment Coupling and Compensation Control of Three-Axis Ship Motion Simulation Turntable
Authors: Liang Li Hua , Cui Dong Liang , Zhang Song Tao , Cui Dong Hai
Published: October 2009

With regard to the high precise three-axis ship motion simulation turntable, the precision is influenced by strong dynamics coupling, such as the moment coupling when three frames rotating at the same time. Therefore, the coupling problem of three-axis ship motion simulation turntable was analyzed profoundly. Then, on the basis of the analysis, in order to restrain the disturbance of coupling torque, the method of dynamic robust compensation based on decoupling control was given. Finally, the compound control strategy including PID control, velocity feedback, position feedback ,input signal differential feedforward and dynamic robust compensation was employed, and a electromechanical Co-simulation of three-axis turntable based on ADAMS and MATLAB was completed. The results of the Co-simulation prove that the method given in this paper can restrain coupling disturbance and improve dynamic tracking performance of three-axis simulation turntable
Finite Capacity Planning for Multiple TFT-LCD Color Filter Fabs
Authors: Chen James C. , Hu Shu Jen , Huang Po Tsang B. , Lin Chiuhsiang Joe , Chao Kuo Jung , Chen Chih Cheng
Published: October 2009

A Finite Capacity Planning Policy (FCPP) is developed for multiple color filter (CF) fabs where each fab has several identical production lines. FCPP assigns customer orders to multiple fabs and multiple lines by taking into account each fab’s available capacity and Work-In-Process (WIP) level, as well as each order’s batch size, product type, process routing, and processing time. After all orders are assigned to fabs and lines, order release time and finish time are determined by the implementation of several modules. FCPP is developed in Microsoft Visual Basic for Application (VBA), and an AutoMod simulation model is also developed. A company with two CF fabs and two lines at each fab is treated as a case study, and industrial data from these fabs are collected and used to evaluate the performance of FCPP based on the design of experiments. Preliminary simulation results show that FCPP can effectively and efficiently balance the loading between fabs and also balance the loading between lines in each fab.
Calculation of Contact Forces of Large-Scale Heavy Forging Manipulator Grippers
Authors: Li Qun Ming , Gao Dan , Deng Hua
Published: October 2009

Different from dexterous robotic hands, the gripper of heavy forging manipulator is an underconstrained mechanism whose tongs are free in a small wiggling range. However, for both a dexterous robotic hand and a heavy gripper, the force closure condition: the force and the torque equilibrium, must be satisfied without exception to maintain the grasping/gripping stability. This paper presents a gripping model for the heavy forging gripper with equivalent friction points, which is similar to a grasp model of multifingered robot hands including four contact points. A gripping force optimization method is proposed for the calculation of contact forces between gripper tongs and forged object. The comparison between the calculation results and the experimental results demonstrates the effectiveness of the proposed calculation method.
Layout Optimization of Mooring Base of the Ship-Based Helicopter Based on FEM
Authors: Qiu Chang Hua , Song Qiang , Zhou Li Jie
Published: October 2009

The ship-based helicopter is always dangling in the sea because of winds and waves. It is necessary to analyze and calculate the mooring of helicopter. In order to void the complex derivation of mathematical formulas, the parameterized finite element method (FEM) model about the ship-based helicopter body, mooring cable and mooring base is established with the software ADAMS. This model is used to calculate the mooring tension and optimize the locations of the mooring bases. In the various layouts of the mooring bases, the minimal mooring tension is the layout optimization object. After some added constraint conditions are considered, the mooring point coordinates are searched and calculated in the standard and nonstandard parking positions with subproblem approximation method. Through the comparison and analysis of the relative changing ratio of the position coordinates, the final optimization layout scheme is obtained.
Path Planning and System Simulation for an Industrial Spot Welding Robot Based on SimMechanics
Authors: Liu Shao Gang , Du Hong Wang , Wang Shi Cheng , Zhao Ya Nan
Published: October 2009

A robot used for industrial spot welding is a 4-DOF serial mechanism, it can be applied to some special industries. There are multi via points known in path, each joint value can be accurately solved by the inverse kinematics. The quintic polynomial interpolation was adopted between each two adjacent desired via points, the continuous trajectory is formed in accordance with the time course. The simulation model is developed using SimMechnics, the movement parameters and path are obtained by simulating, the simulation results indicate that the motional parameters and path can be accurately and effectively obtained for robot analysis and design.
Layout Design of Naval Gun Magazine Based on Improved GA
Authors: Fu Wei , Hu Sheng Hai , Ge Yang
Published: October 2009

In this paper a magazine layout optimization model with performance constraints is described and the objective function and its constraints of magazine layout are established. A multiobjective optimizations layout model based on polygon method is put forward. The model deals with a series of constraints such as geometry constraints, in-and-out point position optimization, magazine capacity and system reliability and safety. An improved genetic algorithm (GA) is proposed in this paper based on the new encoding scheme and logical mutation operator. The algorithm solved the problem of multiobjective layout design with performance constraints.
Digital Design of the Ocean Casing Pipes Centering Equipment
Authors: Xing Xiao Dong , Zhang Li Xun , Wang Li Quan , Liu Jun
Published: October 2009

An Ocean Casing Pipes Centering Equipment is designed and implemented. Utilizing the equipment, two casing pipes can be fastened together by means of welding. The equipment can automatically carry out clamping and centering two casing pipes, and then the butt welding is conducted at their adjacent ends. In the development of this equipment, some advanced means, such as digital modelling and FEA (Finite Element Analysis), are taken full advantage of. First, all the parts’ 3D models are built with Pro/Engineer. Then, those digital parts is assembled in Pro/E assembly environments. Meanwhile, assembly interference detection is executed. Furthermore, by means of universal finite-element software，the finite element model is constructed. The strength and stiffness of the structure is calculated and analyzed so that the faults of the equipment can be found out in design stage. Through repeating this designing and verifying course, the structure of the equipment can be improved.
Numerical Simulation of Ship Maneuvering Motions in Viscous Flow
Authors: Li Dong Li , Yang Liang , Zhang Hong Yu , Peng Tian Shu
Published: October 2009

In this paper, based on CFD method and dynamic mesh technology, the ship maneuvering performance is predicted in viscous flow. Numerical computation models are built to realize the simulation of the ship maneuvering motions such as static drift test, static rudder test, pure yaw test and pure sway test. Hydrodynamic forces and moments acting on a maneuvering ship are obtained in the body-fixed coordinate system. The computational results are compared with data of potential theory method. Then based on VC code, a simulator of ship maneuvering motions is built to simulate ship Zigzagging and Turing test. The results show that the present numerical simulation method and the ship maneuvering motion simulator are able to be used in numerical simulation of the real size ship maneuvering motions in viscous flow field.
External Effect Analysis of Enterprises’ Action in Industrial Symbiosis Network
Authors: Wang Xiu Li , Zhu Geng Xian
Published: October 2009

The paper analyzed external effects of enterprises’action in industrial symbiosis network using external effect theory; constructed an externality analysis model and obtained the condition of enterprises’ participation in industrial symbiosis network through analyzing the model solution. The condition is that the actual marginal expenditure of participation in industrial symbiosis network is not more than the marginal expenditure of pay sewage charges The paper construed the reasons of negative externalities of enterprises’ action transforming into positive ones through participation in the industrial symbiosis network, put forward that the implementation of this transformation is the new method to solve the problems about external effects of environmental pollution.
Parameterized Modeling and Virtual Prototype of Planetary Reducer
Authors: Jiang Li Dong , Chang Shan , Dai Guang Hao , Zhu Zhen Rong
Published: October 2009

The three-dimensional parameterized model of the planetary reducer was established on the platform of Pro/E. Especially, the parameterized gear model was built through transforming the accurate equations of the involute and the tooth root transition curve into the expressions that can be identified by the Pro/E. Therefore, the accuracy of the model is relatively high and the method used in the paper can eliminate tooth interference effectively. Then, the three-dimensional assembly model for planetary reducer was obtained through the Virtual Assembly Technique and the Assembly Module in Pro/E. In brief, the method used in the paper has supplied a relatively accurate model for the dynamic analysis. At the same time, it can reduce dramatically research cycle and cost, and has supplied an effective development approach for the planetary reducer.
Research on Module Partition Strategy of Optional Disassembly
Authors: Wang Wei Lin , Zhang Jia Tai
Published: October 2009

Optional disassembly could fulfill the process that parts remove from assembly, which is useful for product maintain, discarding and recycle. Total disassembly planning algorithm can be obtained through proper analysis and evaluation, however that is a difficult process. It is hard to obtain optimal solutions when a huge number of parts are to be removed from an assembly. Exponential explosion during the process of disassembly sequence generation has become a bottleneck for a long time due to over large number of parts included in the product. To solve this problem, an approach based on the modulization is proposed in the paper to generate the disassembly sequence. To partition modules of manufacture equipments, the module identifying method based on multi-rule decision can effectively solve the explosive problem. This method deals with the restrictions and limits of parts before disassembly, hence making disassembly more like the situation of the fact which is limiting the quantity of disassembly combinations, enhancing the efficiency of disassembly and making disassembly much easier.
An Intelligent Image Segmentation Algorithm for Medical Ultrasonic Instruments
Authors: Gu Guo Chang , Zhu Chang Ming , Liu Hai Bo , Jing Sheng , Yu Hua Long
Published: October 2009

In company with medical instruments ' development, the corresponding software plays more and more role in the application. And medical image processing software has become an important component of the medical ultrasonic instruments. Image segmentation plays an important role in both qualitative and quantitative analysis of medical ultrasound images. But state-of-arts methods in the aspect of segmentation can not get satisfactory results. We propose an intelligent image segmentation method for medical ultrasonic images. The algorithm improved active contour model with relevance vector machine, where the advantages of supervised learning classification and the global region distribution information can be exploited to enhance the performance. In order to improve the segmentation speed and get precise initial contour, relevance vector machine also is used to obtain initial contour firstly. A large amount of experimental results have proved that our method outperforms many state-of-arts methods in the aspect of segmentation, and the method can be used in ultrasonic instruments effectively.
Solution of the Edges of Mode III Asymmetrical Dynamic Interface Crack Subjected to Variable Loads
Authors: Luan Xu , Lü Nian Chun , Jin Cheng
Published: October 2009

By the approaches of the theory of complex functions, propagation problems concerning mode Ⅲ asymmetrical dynamic interface crack were studied. The problems can be transformed into Riemann-Hilbert problem easily by the measures of self-similar functions, and the universal expressions of analytical solutions of the edges of mode Ⅲ asymmetrical dynamics interface crack subjected to variable loads and respectively, were attained.
Hardware-in-the-Loop Simulation of Speed-Adjusting System for DC Motor Based on dSPACE
Authors: Wang Yin Yan , Yang Chuan Lei , Du Jian Wei
Published: October 2009

Based on dSPACE real-time simulation system and LabVIEW measuring system, semi-physical simulation platform of DC motor speed-adjusting system was established. Fuzzy PID algorithm was designed based on analyzing fuzzy control and PID control for speed-adjusting system. The simulation results show that compared to standard PID algorithm, fuzzy PID algorithm improves the performance of speed-adjusting system for DC motor. On this basis, the speed-adjusting system was developed based on ATmega128 single-chip and original algorithm. Compared with simulation speed-adjusting system, there is no obvious difference on response characteristics.
A Methodology to Estimate the Reliability of Passageway system in Naval Ship Design
Authors: Liu Chong , Qiu Chang Hua , Xie Zhi Qiang
Published: October 2009

In this paper, we describe and demonstrate a general methodology to evaluate the reliability of the passageway system in warship design. The reliability of the passageway system is the most important component of naval ship survivability evaluation. Currently, most of the passageway evaluations focus on human factor or physical distribution; integrated calculates is lacking to estimate the reliability of the passageway system. The challenge for naval architects is to develop a systematic methodology that allows accurate evaluation of the passageway reliability associated with crews movement and related material operating procedure. The paper consults the concept of network reliability and lays out an evaluation method of passageway system based on task reliability. The method integrated analyses the impact of ship crew‘s location and distribution of the shipborne material. As it was difficult to achieve the reality data, the methodology is demonstrated using a hypothetical warship combining with the simulation software on the basis of two different evaluation scenarios.
The Simulation and Analysis of the Dining-Room Servicing Mode in a Luxury Passenger Liner
Authors: Shang Zhen , Zhu Shi Fan , Qiu Chang Hua
Published: October 2009

The service in dining-room for the sailors is a very important issue in a luxury passenger liner which affects the work’s performance, so as well as the ship’s. There has not too much research about this topic in China right now. A method to simulate and analyze the dining-room servicing mode which was based on the discrete event system using the software QUEST has been brought out, and used to estimate a design project by analyzing the six factors which affect the servicing mode while releasing a final implement suggestion.
The Simulation and Analysis of the Servicing Mode of the Showering System in a Luxury Passenger Liner
Authors: Shang Zhen , Zhu Shi Fan , Qiu Chang Hua
Published: October 2009

It is a complex but important issue to have a shower for the sailors in a luxury passenger liner whose working and living staff are all to be held in a closed environment. It is hard to decide what kind of showering mode can satisfy the sailors’ showering need, as well as using discrete event theory to handle it because of the mass of people and their behavior’s randomicity. A method based on the theory of discrete event to simulate the showering mode in the ship has been brought out by using the software of QUEST, and the design of the bath system of the ship has been proved to be with usability after simulations. What factors and how they affect the performance of the showering system have been found. At last, an implementation suggestion has been brought forward.
Description of Work-Hardening Layer’s Depth by Soft Coefficient
Authors: Liu Rong Chang , Chen Li Dong , Wu Yu , Ma Shu Ying , Feng Li Zhen
Published: October 2009

In this paper, by introducing the conceptions of stress condition and soft coefficient, a nonlinear equation is used to describe stress condition of the contacting body along depth. By taking the classical contact problem of two parallel cylinders as an example, we give a quantitative description of work-hardening layer’s depth related to local contact problems by using soft coefficient, and it is theoretically proved that plastic deformation and plastic failure exist objectively in engineering contact problem. The analysis indicates that hardening layer’s depth in the range of 0.43643b(where “b” represents contacting semi-width ), where soft coefficient equivalents to infinity, can be defined as "work-hardening surface layer", depth ranging from 0.43643b to 3b can be roughly defined as "subsurface layer", and depth ranging out of 3b can be defined as "deep layer". Finite element analysis of Ono-rolling specimen shows that measuring method of x-ray of the residual stress is relatively more accurate in the surface layer; however, numerical method can give more accurate results than experimental method in the subsurface and deep layer.
Modeling and Applying of the Relationship between Module Interfaces Based on the Extenics
Authors: Li Jiang
Published: October 2009

Modular design is a key technique of mass customization. The relationship between the module interfaces is the basis of modular design, and it is essential to study the model and the application of the relationship between the module interfaces. Based on the Matter-element model of the Extenics, the models of the module, module interfaces and the relationship between module interfaces were established. Combining with the Boolean matrix of the module interfaces relationship, the application of the model was discussed.
Research on Fuzzy Scheduling Problem of Single-Stage Multi-Parallel Machines
Authors: Zhan Yong , Zhong Yu Guang , Qiu Chang Hua
Published: October 2009

This paper considers single-stage multi-parallel machines scheduling problems. A fuzzy scheduling model is developed with objective to minimize the makespan. In the scheduling model, the uncertainty of processing time is represented by triangular fuzzy number, and the credibility theory is used to assess fuzzy number. In the optimal scheduling searching process, we introduce matching theory to model the scheduling problem consider in this paper, and two heuristic rules are used to improve searching efficiency. At last, genetic algorithm is developed for solving the scheduling problem, and numerical example shows good result.
Research and Application of Workflow Technology in Multiple-Disciplinary System Development
Authors: Wang Cheng Long , Zeng Qing Liang , Liu Zhi Hai , Wan Li Rong
Published: October 2009

Workflow technology in multiple-disciplinary system development is studied and applied in this paper. After the problems during the process of multiple-disciplinary system development are analyzed, workflow technology in multiple-disciplinary system development is studied and the method of overall using workflow technology in multiple-disciplinary system development process is given. Finally an example is presented for application, which shows validity of this method.
Research on Workflow Management of Multi-Disciplinary Collaborative Design Based on Ontology
Authors: Zeng Qing Liang , Liu Zhi Hai , Wan Li Rong , Zhao Yong Hua
Published: October 2009

In this paper, the mechanism of workflow management based on ontology of multi disciplinary collaborative design is studied. Based on the integrative research of key technologies of semantic technology and semantic retrieval and workflow management, an ontology-based workflow framework of multi-disciplinary collaborative design is put forward. Models of workflow-related elements on different levels were built up according to subjects related in collaborative design. An ontology-based workflow model library of multi-disciplinary collaborative design is set up by using RDF. The currently popular ontology retrieval strategy is analyzed, and an ontology model search engine in workflow of multidisciplinary collaborative design is set up by combining the keywords-based with ontology-based semantic search.
Study of Product Modeling Method Based on UML
Authors: Zhu Hai Tao , Pan Wen Lin , Liu Chao
Published: October 2009

The product modeling method based on UML is presented in order to solve the consistency problem of definition, process and resources in the product life-cycle, and meet the need of developing the system from various viewports. Through the definition of three-layer product model structure included “product meta-meta model layer”, “product meta model layer” and the “product model layer” and its contents and their interrelation, the definition of a product modeling and constraint unity have been achieved to. The practical application reflects the validity and the feasibility of UML-based product modeling method.
Status of Eco-Design in Thai Furniture Industry
Authors: Klinpikul Nongnuch , Srichandr Panya
Published: October 2009

Furniture manufacturing is known to have considerable impacts on the environment and there is a definite trend towards environmental-friendly product designs in the industry worldwide. This paper reports the results of an exploratory research on the status of eco-design in the Thai furniture industry. Two basic research questions are addressed; 1) are there any eco-design activities and, if so, to what extent and 2) what are the driving forces that drive or hinder eco-design activities. A combination of research methodologies were employed; interviewing, survey, and actually examining selected products in the market. The results show that key personnel know very little about eco-design, but they have implemented a number of eco-design methods in their products and processes in practice. The driving force for such progress seems to be not from the environmental consciousness per se but rather the demands and requirements from the customers and the markets. The legal and supporting infrastructure to promote and move eco-design forward is just emerging and still rather weak. There are, however, considerable implementation problems and obstacles due to lack of technical know-how on the part of the personnel involved. It is concluded that the Thai furniture industry is implementing number of eco-design activities without knowing much about eco-design principles and the underlying philosophy. Public awareness and consequently the market force is key to moving eco-design forward. Effective campaigns and better education on sustainable development and eco-design, together with stronger legal and supporting infrastructure, would certainly help increase eco-design activities.
Core Sustainable Values: Examining the Consideration and Influence of Social Factors within Sustainable Technologies
Authors: Marsh Phillipa
Published: October 2009

Sustainable technologies appears to focus, as the name suggests, on the technological considerations, following more of a ‘how it works’ or ‘can do’ approach to sustainability. As sustainable concerns appear increasingly prevalent within engineering and design developments, immense practical knowledge is being developed which advances this area further. Moreover, users are progressively aware of the importance of sustainability and are driving demand further, commercially, to develop outcomes with a sustainable label attached. This paper draws from various multi-disciplinary research and theoretical concepts to examine the social influence within sustainable technologies. From this, debate surrounding sustainability can be opened up to a more rounded and responsible perspective. Social considerations are seen in this paper as fundamental to sustainable technology, not only in being classified as sustainable but also producing effective and understandable technical solutions for users.
Web-Based Education Support Tools Used for Teaching the “Engineering Graphics” Course
Authors: Konukseven (1) Erhan Ilhan
Published: October 2009

Computer Aided Design (CAD) tools are essential in modern industry. The students can actually use the skills and knowledge learned in “Computer Aided Engineering Graphics” course through their education and professional life. This paper describes and demonstrates how “ME-105 Computer Aided Engineering Graphics” course was offered to non-mechanical engineering students at Middle East Technical University (METU) using Web-based materials. Using the offered Web-based course model it is possible to give the course to 900 non-mechanical engineering students (450 students and 9 sections each semester) by teaching assistants. The model provides the same quality of teaching that we have in the engineering drawing course offered to 210 mechanical engineering students using the traditional classroom methods with full-time instructors.
An IPMC Actuated 3D Swimming Microrobot and its Propulsive Efficiency Analysis
Authors: Ye Xiu Fen , Su Yu Dong , Guo Shu Xiang
Published: October 2009

An Ionic polymer metal composites (IPMC) actuated 3D swimming microrobot is presented first. Inspired by biologic fins, passive plastic fin is attached to the IPMC strip to increase the thrust. Infrared sensors are equipped for wireless control and autonomous navigation. Then propulsive efficiency analyses are carried out. From the water electrolysis influence analysis of the IPMC, the best working voltage is confirmed. Finally, a two parts IPMC actuator is presented to improve the propulsive efficiency of the microrobot after the analysis of propulsive efficiency of caudal fin.
Heterogeneous Object Modeling Approach Based on ACIS and HOOPS
Authors: Xu An Ping , Zang Ting , Ji Zhen Peng , Qu Yun Xia
Published: October 2009

This paper deals with the background and significance of working on heterogeneous objects modeling and briefly introduces the architecture of ACIS and HOOPS and their corresponding functional modules. Based on inverse-distance weighting algorithm to determine the material composition within the object, the general approach to modeling the heterogeneous objects by using ACIS and HOOPS is introduced and demonstrated via some simple examples.
Design of Cascade-Smith Hybrid Control Structure for Pressure Control
Authors: Xie Yu Dong , Liu Yan Jun , Wang Yong
Published: October 2009

A new hybrid-control structure for the compensation of the volume-delay negative effect in the mixed-gas pressure control is designed. The volume-delay mechanism is discussed. A Smith predictor is used in the primary loop of a cascade control system where the secondary loop has a negligible delay while the primary loop has a significant and variant delay. To deal with the sensitivity of Smith predictor to modeling error, the gas pipe model for the Smith predictor can be updated by measuring the gas pressure and choosing the model characteristics through a lookup table. The results show that the proposed control structure brings together the best merits of a cascade control and the Smith predictor structure, and it can provide a better performance than the traditional cascade control.
Research on Identification Method of Multi-Mixed Vibration Signal of Aeroengine
Authors: Jin Xiang Yang , Zhong Shi Sheng
Published: October 2009

The effectiveness of separation and identification of mechanical signals vibrations is crucial to successful fault diagnosis in the condition monitoring and diagnosis of complex machines.Aeroengine vibration signals always include many complicated components, blind source separation (BSS) provides a efficient way to separate the independent component.In order to get the most effective algorithm of vibration signal separation,experiment has been done to acquire plenty of multi-mixed rotor vibration signals,three sets of vibration data generated from aeroengine rotating shafts were separated from the synthetic vibration signal. The results prove that blind source separation is effective and can be applied for vibration signal processing and fault diagnosis of aeroengine.
The Highly Efficient Calculation Method of 3-D Frequency-Domain Green Function
Authors: Chen Hai Long , Zhang A Man , Sun Shi Li
Published: October 2009

The traditional calculation method of frequency-domain Green function mainly utilizes series or asymptotic expansion to carry out numerical approximation. This method requires very careful divisions of the regions the variables of the integrand. Thus the computing process can be time consuming, which greatly affects the calculation efficiency. Gaussian quadrature is applied to the numerical calculation of the frequency-domain Green function and its partial derivatives. The variation trend of Green function and its partial derivatives along the coordinate plane is analyzed. Comparison of the calculation result with that in existing references is made, which shows that the present method has greatly simplified the computing process, reduced the level of divisions of the regions of variables, improved the computing efficiency and provided higher accuracy.
Fabrication of Micro Structures by Ultra Short Voltage Pulse Electrochemical Machining
Authors: Chen Hui , Wang Zhen Long , Peng Zi Long , Zhao Wan Sheng
Published: October 2009

. The purpose of this paper is to study the application of electrochemical machining (ECM) technology for the fabrication of micro structures. The stray current corrosion, i.e. machining localization is a critical obstacle to micro fabrication for ECM. To machine micro structures by electrochemical machining ultra short voltage pulse is used. The effects of electrochemical machining parameters such as voltage, pulse duration, pulse frequency, and electrolyte composition on the machining accuracy were studied. In experiments, a micro hole was machined on stainless steel with cylindrical and square electrodes to investigate these effects.
Bearing Condition Identification Using Improved Multiscale Entropy and SVMs
Authors: Zhang Long , Xiong Guo Liang , Liu He Sheng , Zou Hui Jun
Published: October 2009

This paper presents a method for bearing health condition identification based on improved multiscale entropy (IMSE) and support vector machines (SVMs). IMSE refers to the calculation of improved sample entropies, i.e., fuzzy sample entropies (FSampEn) across a sequence of time scales, which takes into account not only the nonlinearity but also the interactions and coupling between mechanical components, thus providing much more information regarding machine health condition compared to traditional single scale-based entropy. On the other hand, in engineering practice, the amount of fault samples is often limited, which thus decrease the performance of traditional classifiers like artificial neural networks (ANNs). Currently popular SVMs provide a favorable solution to small sample-sized problems. In this study, IMSE and SVMs were employed as fault feature extractor and classifier, respectively. The experimental results verify that the proposed method has potential applications in bearing health condition identification.
Indirect Adaptive Generalized Predictive Control for an Autonomous Underwater Vehicle
Authors: Xu Jian An , Liu Gui Fu , Zhao Wen De , Zhang Ming Jun
Published: October 2009

This paper investigates the application of indirect adaptive generalized predictive control to an autonomous underwater vehicle motion. A difference controlled auto-regressive integrated moving average model is used as the multi-step predictive model. Recursive least square method based on forgetting factors is used to identify the parameters of the difference controlled auto-regressive integrated moving average model. Simulation result shows that indirect adaptive generalized predictive control algorithm can be used to control the autonomous underwater vehicle motion.
The Research of Processing Technique for Die-Pressing Based on FEA
Authors: Wang Sheng Wu , Wen Ai Ling , Zhao Huai Rui , Jin Xue Song , Zhang Xue Shan
Published: October 2009

The 3D finite element simulations are conducted for the cold working of a fastener hole in a low carbon steel plate. The simulation models the actual cold working process where the hole edge is chamfered with die-press. The agreement of finite element method and experimental results is good enough. The residual stresses are analyzed under the different die-press parameters and contact conditions i.e. die-pressing depth, friction factor, the die taper. The main results in this work are as follows: With increasing in chamfer depth the maximum compressive residual stress shows an increasing within the chamfer range of C1.5; the compressive residual stress is decrease with increasing friction; with increase in die taper the maximum compressive residual stress shows the slow increase. The efficiency for enhancing the load-carrying capacity of structural components with cylindrical holes subjected to bending load has been proved by means of FE simulation. The study shows that the simulations of cold working are necessary for if predicted residual stresses are to be used to assess fatigue life and for design die-pressing tool, improvement of parameters of the process of DP working.
Research of Fatigue Limit and Stress Concentration on Structural Steel with Double-Notches
Authors: Wang Sheng Wu , Sun Shu Juan , Wen Ai Ling , Wang Wei Da , Nishida Shinichi
Published: October 2009

The fatigue limit of parts and components that have the multi-notches is important data for the design and manufacture of machinery and traffic equipment which are operated under the high speed or pressure. In this paper the rotating bending fatigue tests have been carried out to investigate the fatigue limit of specimen with double-notch that is constructed of step and blind hole, and analyzed the effect of stress concentrations at the double-notched bottoms on the fatigue limits, using three-dimensional elastic finite element method. Firstly, the fatigue tests of 8 group specimens have been performed for examining the of fatigue limits of the single-notched specimen and double-notched specimen, respectively. Additionally, the stress field interactions between two stress fields by the blind hole notch and step are discussed using three-dimensional elastic finite element method. The main results obtained in this study are as follows: The fatigue limit of the double-notched specimen are down comparison with the fatigue limit of the single-notched specimen; the fatigue limit of the double-notch specimen is insensitive to distance between the blind hole and step for the low carbon structure steel with better ductility; for the high-strength steel, superposition and intensification of the stress concentration by the blind hole and step mutually may be avoided so that their adverse effects on the fatigue strength may be become to minimize, as take appropriate distance between the blind hole and step. The results are significant for the design of engineering design of the multi-notched parts, and the study of fatigue strength.
Optimization Design of Pressure Shell in Underwater Vehicle Based on Response Surface Model
Authors: Yang Zhuo Yi , Pang Yong Jie , Qin Zai Bai
Published: October 2009

Cylinder shell stiffened by rings is used commonly in submersibles, and structure strength should be verified in the initial design stage considering the thickness of the shell, the number of rings, the shape of ring section and so on. Based on the statistical techniques, a strategy for optimization design of pressure hull is proposed in this paper. Its central idea is that: firstly the design variables are chosen by referring criterion for structure strength, then the samples for analysis are created in the design space; secondly finite element models corresponding to the samples are built and analyzed; thirdly the approximations of these analysis are constructed using these samples and responses obtained by finite element model; finally optimization design result is obtained using response surface model. The result shows that this method that can improve the efficiency and achieve optimal intention has valuable reference information for engineering application.
Effect of the Bearing Preload on the Characteristics of the Spindle Stiffness
Authors: Lin Shen Yung , Chung C.T. , Chang R.W. , Chang C.K.
Published: October 2009

The main objective of this study is to investigate the effect of bearing preloads on the characteristics of spindle stiffness. Finite element model for spindle-bearing system is established enabling the variation of spindle stiffness calculations under different bearing preloads. On the other hand, the spindle stiffness may also be obtained from the experiment and its result may be utilized to validate the numerical calculations. The front-end section of spindle is acted by poise weights at different directions, and their corresponding deformations are measured through dial indicator. Three bearing preload conditions, i.e. light, medium and heavy preloads are selected, which are imposed on the bearing to investigate the spindle stiffness variation, respectively. In addition, the effects of the geometrical parallelism error at the end surfaces of spacer due to the manufacturing tolerance or some imperfection on the spindle stiffness are studied. Finally, the impact test on the spindle-bearing body is performed by hammer and the corresponding vibration signal on the spindle surfaces is acquired by accelerometer. The spindle stiffness may be reflected in the other manner through the signals processing by spectrum analysis.