2003 Vol.16(4)
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2003, 17(4).
Abstract:
A short survey on researching and developing status of intelligent technologies in modern welding manufacturing is given. According to the developing trend of advanced manufacturing technology, a concept on intelligentized welding manufacturing engineering (IWME), is presented for systematization of researching and developing domains on welding automation, intelligentized welding, robotic and flexible welding and advanced welding manufacturing technologies. And key technologies of welding intelligent manufacturing and its developing trend in the future are investigated.
A short survey on researching and developing status of intelligent technologies in modern welding manufacturing is given. According to the developing trend of advanced manufacturing technology, a concept on intelligentized welding manufacturing engineering (IWME), is presented for systematization of researching and developing domains on welding automation, intelligentized welding, robotic and flexible welding and advanced welding manufacturing technologies. And key technologies of welding intelligent manufacturing and its developing trend in the future are investigated.
2003, 17(4).
Abstract:
Using the finite element code ANSYS/LS-DYNA, a dynamic finite element model with an elastic-linear-kinematic-hardening plastic material is established to analyze elastic-plastic stresses in the railhead in the impact process of wheel and rail occurring at the gap of rail joint. The model is based on the discrete elastic support condition of the rails, which is suitable for the actual situation of wheel/track rolling contact. In the analysis the influences of axle load, yield stress and tangent modulus of rail material on the stresses and strains are investigated in detail. The distribution of stresses and strains in the jointed railhead are given. It is found that the axle load, yield stress and tangent modulus of rail material greatly affect the stresses and strains in the railhead during impacting. The study provides a reliable method and useful datum for the further research on fatigue and wear of railhead and improving the rail joint mode.
Using the finite element code ANSYS/LS-DYNA, a dynamic finite element model with an elastic-linear-kinematic-hardening plastic material is established to analyze elastic-plastic stresses in the railhead in the impact process of wheel and rail occurring at the gap of rail joint. The model is based on the discrete elastic support condition of the rails, which is suitable for the actual situation of wheel/track rolling contact. In the analysis the influences of axle load, yield stress and tangent modulus of rail material on the stresses and strains are investigated in detail. The distribution of stresses and strains in the jointed railhead are given. It is found that the axle load, yield stress and tangent modulus of rail material greatly affect the stresses and strains in the railhead during impacting. The study provides a reliable method and useful datum for the further research on fatigue and wear of railhead and improving the rail joint mode.
2003, 17(4).
Abstract:
An efficient algorithm for finding an optimal deadlock-free schedule in a manufacturing system with very limited buffer is presented. This algorithm is based on the effective genetic algorithm (GA) search method, and a formal Petri net structure is introduced to detect the token player assuring deadlock-free. In order to make the scheduling strategy generated by GA meet the required constraint of deadlock-free, Petri net is involved to make the implementation of the job scheduling in an FMS deadlock-free. The effectiveness and efficiency of the proposed approach is illustrated by using an example.
An efficient algorithm for finding an optimal deadlock-free schedule in a manufacturing system with very limited buffer is presented. This algorithm is based on the effective genetic algorithm (GA) search method, and a formal Petri net structure is introduced to detect the token player assuring deadlock-free. In order to make the scheduling strategy generated by GA meet the required constraint of deadlock-free, Petri net is involved to make the implementation of the job scheduling in an FMS deadlock-free. The effectiveness and efficiency of the proposed approach is illustrated by using an example.
2003, 17(4).
Abstract:
The cyclic stress-strain responses (CSSR), Neuber's rule (NR) and cyclic strain-life relation (CSLR) are treated as probabilistic curves in local stress and strain method of low cycle fatigue analysis. The randomness of loading and the theory of fatigue damage accumulation (TOFDA) are considered. The probabilistic analysis of local stress, local strain and fatigue life are constructed based on the first-order Taylor's series expansions. Through this method proposed fatigue reliability analysis can be accomplished.
The cyclic stress-strain responses (CSSR), Neuber's rule (NR) and cyclic strain-life relation (CSLR) are treated as probabilistic curves in local stress and strain method of low cycle fatigue analysis. The randomness of loading and the theory of fatigue damage accumulation (TOFDA) are considered. The probabilistic analysis of local stress, local strain and fatigue life are constructed based on the first-order Taylor's series expansions. Through this method proposed fatigue reliability analysis can be accomplished.
2003, 17(4).
Abstract:
Based on the analysis on the development of the cooperative commerce in automobile industry, the systematic model of the cooperative commerce chain in automobile industry is illustrated, the flow of agent-based NCCC (network-based cooperative commerce chain) system is described, and the method and NCCC system in automobile industry are developed, and so the correctness and the feasibility of the theory and the method are confirmed.
Based on the analysis on the development of the cooperative commerce in automobile industry, the systematic model of the cooperative commerce chain in automobile industry is illustrated, the flow of agent-based NCCC (network-based cooperative commerce chain) system is described, and the method and NCCC system in automobile industry are developed, and so the correctness and the feasibility of the theory and the method are confirmed.
2003, 17(4).
Abstract:
The effect of involute contact ratio on the torsional vibration behavior of spur gear-pair is studied analytically through a mass-spring model. The tooth stiffness in model not only has a relation with time, as many prior studies presented, but, more important, with involute contact ratio (ICR) as well. The ICR embodies its impact on the spur gear's dynamic performance through changing the proportion of tooth stiffness when there are n+1 teeth in contact to tooth stiffness when there are n teeth in contact. A couple of curves about impact of ICR on the gear's dynamic performance are presented, and they clearly demonstrate that the model can accurately describe the effects of ICR on dynamic transmission error. Finally, some conclusions useful to reduce vibration and noise of gear-pair are proposed.
The effect of involute contact ratio on the torsional vibration behavior of spur gear-pair is studied analytically through a mass-spring model. The tooth stiffness in model not only has a relation with time, as many prior studies presented, but, more important, with involute contact ratio (ICR) as well. The ICR embodies its impact on the spur gear's dynamic performance through changing the proportion of tooth stiffness when there are n+1 teeth in contact to tooth stiffness when there are n teeth in contact. A couple of curves about impact of ICR on the gear's dynamic performance are presented, and they clearly demonstrate that the model can accurately describe the effects of ICR on dynamic transmission error. Finally, some conclusions useful to reduce vibration and noise of gear-pair are proposed.
2003, 17(4).
Abstract:
Comparing with usual continuous jet nozzle, the self-excited oscillation pulsed jet nozzle SEOPJN) can make jet generate a higher peak of pressure and larger scouring volume. And it can make jet increase the effective standoff distance, too. The basic theories of the SEOPJN are introduced. Some experimental results are shown. According to the results, using tricorn bits assembled the SEOPJN to drill oil well, the ROP increases by 8%～77%, and the rates of the footage for tricorn bit increases by 6.7%～44.0%.
Comparing with usual continuous jet nozzle, the self-excited oscillation pulsed jet nozzle SEOPJN) can make jet generate a higher peak of pressure and larger scouring volume. And it can make jet increase the effective standoff distance, too. The basic theories of the SEOPJN are introduced. Some experimental results are shown. According to the results, using tricorn bits assembled the SEOPJN to drill oil well, the ROP increases by 8%～77%, and the rates of the footage for tricorn bit increases by 6.7%～44.0%.
2003, 17(4).
Abstract:
The control of single pneumatic muscle actuator is studied, as one basic part of research on the parallel-robot arthrosis actuated by pneumatic muscle actuators. Experiments show that a self-modified fuzzy-PID controller is obviously effective for its position servo and a simple PID controller is good for its force track.
The control of single pneumatic muscle actuator is studied, as one basic part of research on the parallel-robot arthrosis actuated by pneumatic muscle actuators. Experiments show that a self-modified fuzzy-PID controller is obviously effective for its position servo and a simple PID controller is good for its force track.
2003, 17(4).
Abstract:
A dual-CCD simulating human eyes and neck (DSHEN) vision system is put forward. Its structure and principle are introduced. The DSHEN vision system can perform some movements simulating human eyes and neck by means of four rotating joints, and realize precise object recognizing and distance measuring in all orientations. The mathematic model of the DSHEN vision system is built, and its movement equation is solved. The coordinate error and measure precision affected by the movement parameters are analyzed by means of intersection measuring method. So a theoretic foundation for further research on automatic object recognizing and precise target tracking is provided.
A dual-CCD simulating human eyes and neck (DSHEN) vision system is put forward. Its structure and principle are introduced. The DSHEN vision system can perform some movements simulating human eyes and neck by means of four rotating joints, and realize precise object recognizing and distance measuring in all orientations. The mathematic model of the DSHEN vision system is built, and its movement equation is solved. The coordinate error and measure precision affected by the movement parameters are analyzed by means of intersection measuring method. So a theoretic foundation for further research on automatic object recognizing and precise target tracking is provided.
2003, 17(4).
Abstract:
The mathematical model on the temperature of the waved-edge is constructed according to Jaeger's theory of moving solid and based on the used temperature model of the flat insert. It is possible to forecast the milling temperature through programming. The comparable experiments have been done between the two new three-dimension groove inserts (waved-edge insert, great edge insert) and flat fake insert. The theoretic forecast is in good agreement with the experimental result. According to the cutting conditions, the boundary condition of finite element analysis on cutting temperature field is established, and the three- dimensional temperature fields of inserts with grooves are analyzed by FEM, so as to offer a reference basis for the design and optimization of insert grooves.
The mathematical model on the temperature of the waved-edge is constructed according to Jaeger's theory of moving solid and based on the used temperature model of the flat insert. It is possible to forecast the milling temperature through programming. The comparable experiments have been done between the two new three-dimension groove inserts (waved-edge insert, great edge insert) and flat fake insert. The theoretic forecast is in good agreement with the experimental result. According to the cutting conditions, the boundary condition of finite element analysis on cutting temperature field is established, and the three- dimensional temperature fields of inserts with grooves are analyzed by FEM, so as to offer a reference basis for the design and optimization of insert grooves.
2003, 17(4).
Abstract:
A new local exhaust ventilation hood is presented. First, the test system in laboratory room is established. Secondly a mathematical model is developed in terms of the stokes stream function, and the governing equation is solved using finite-difference techniques. The injection flow of the exhaust hood is treated as a boundary condition of the main flow. Experiments results well agree with the solution of theoretical prediction. The model can, therefore, be used to design this kind of Aaberg hood. Thirdly the important parameters affecting the performance of Aaberg exhaust hood are taken into account. In the mean time the connection of these parameters is deduced by multivariate linear regression based on the experimental results. The work is useful whether in designing this kind of local ventilation Aaberg exhaust hood or in predicting the hood's work performance.
A new local exhaust ventilation hood is presented. First, the test system in laboratory room is established. Secondly a mathematical model is developed in terms of the stokes stream function, and the governing equation is solved using finite-difference techniques. The injection flow of the exhaust hood is treated as a boundary condition of the main flow. Experiments results well agree with the solution of theoretical prediction. The model can, therefore, be used to design this kind of Aaberg hood. Thirdly the important parameters affecting the performance of Aaberg exhaust hood are taken into account. In the mean time the connection of these parameters is deduced by multivariate linear regression based on the experimental results. The work is useful whether in designing this kind of local ventilation Aaberg exhaust hood or in predicting the hood's work performance.
2003, 17(4).
Abstract:
Noise reduction in a shop floor is one of the important parts of green manufacturing. In a shop floor, machine tools are the main noise sources in a shop floor. A new approach is discovered by investigation that the noise can be obviously reduced in a shop floor by optimizing the scheduling between work pieces and machine tools. Based on the discovery, a new method of noise reduction is proposed. A noise reduction scheduling model in a shop floor is established, and the application of the model is also discussed. A case is studied, which shows that the method and model are practical.
Noise reduction in a shop floor is one of the important parts of green manufacturing. In a shop floor, machine tools are the main noise sources in a shop floor. A new approach is discovered by investigation that the noise can be obviously reduced in a shop floor by optimizing the scheduling between work pieces and machine tools. Based on the discovery, a new method of noise reduction is proposed. A noise reduction scheduling model in a shop floor is established, and the application of the model is also discussed. A case is studied, which shows that the method and model are practical.
2003, 17(4).
Abstract:
Passive-active control of a flexible isolation system is investigated from the viewpoint of power flow. Dynamic transfer equations of the system are deduced based on a matrix method which uses mobility or impedance representations of three substructures: the source of vibration, the receiver and the mounting system which connects the source to the receiver. The cancellation of axial input forces to the receiver is considered as the active control strategy and its effects are discussed. The results of the study show that the strategy adopted herein can effectively reduce the power transmitted to the receiver.
Passive-active control of a flexible isolation system is investigated from the viewpoint of power flow. Dynamic transfer equations of the system are deduced based on a matrix method which uses mobility or impedance representations of three substructures: the source of vibration, the receiver and the mounting system which connects the source to the receiver. The cancellation of axial input forces to the receiver is considered as the active control strategy and its effects are discussed. The results of the study show that the strategy adopted herein can effectively reduce the power transmitted to the receiver.
2003, 17(4).
Abstract:
In an extraction turbine, pressure of the extracted steam and rotate speed of the rotor are two important controlled quantities. The traditional linear state feedback control method is not perfect enough to control the two quantities accurately because of existence of nonlinearity and coupling. A generalized minimum variance control method is studied for an extraction turbine. Firstly, a nonlinear mathematical model of the control system about the two quantities is transformed into a linear system with two white noises. Secondly, a generalized minimum variance control law is applied to the system. A comparative simulation is done. The simulation results indicate that precision and dynamic quality of the regulating system under the new control law are both better than those under the state feedback control law.
In an extraction turbine, pressure of the extracted steam and rotate speed of the rotor are two important controlled quantities. The traditional linear state feedback control method is not perfect enough to control the two quantities accurately because of existence of nonlinearity and coupling. A generalized minimum variance control method is studied for an extraction turbine. Firstly, a nonlinear mathematical model of the control system about the two quantities is transformed into a linear system with two white noises. Secondly, a generalized minimum variance control law is applied to the system. A comparative simulation is done. The simulation results indicate that precision and dynamic quality of the regulating system under the new control law are both better than those under the state feedback control law.
2003, 17(4).
Abstract:
Because of an unexpected signal noise within the network or an unpredicted fault with personal computers (PCs), many problems emerge in the implementation of distributed numerical control (DNC) with PCs-based network. To solve the problems, an industrial solution of involving the field-bus technology in DNC communicating area is provided. A kind of advanced Field-bus, named controller area network (CAN), is originally developed to support cheap and rather simple automotive applications. However, because of its good performance and low cost, it is also being considered in automated manufacturing and process control environments to interconnect intelligent devices, such as modern sensors and actuators. Recently it creates a new role for CANBus in DNC that brings new thinking to DNC. CAN is used as the network platform for connecting machine tools to share information with each other reliably. Additionally, thanks to also applying of “plug-in” technology and a special interface of hardware, this solution exhibits some high compatibility with different pedigree numerical control (NC) systems, such as Fanuc, Siemens, Cincinnati and so on. In order to improve CANBus for DNC application, a communicating competition model of the basic CAN protocol, called CC model, is then highlighted. This model is able to satisfy the requirements that different machine tools share the communicating bandwidth fairly when they run concurrently. Finally the novel view of the latest advancement in CANBus-based DNC in combination with the manufacturing paradigm is also presented.
Because of an unexpected signal noise within the network or an unpredicted fault with personal computers (PCs), many problems emerge in the implementation of distributed numerical control (DNC) with PCs-based network. To solve the problems, an industrial solution of involving the field-bus technology in DNC communicating area is provided. A kind of advanced Field-bus, named controller area network (CAN), is originally developed to support cheap and rather simple automotive applications. However, because of its good performance and low cost, it is also being considered in automated manufacturing and process control environments to interconnect intelligent devices, such as modern sensors and actuators. Recently it creates a new role for CANBus in DNC that brings new thinking to DNC. CAN is used as the network platform for connecting machine tools to share information with each other reliably. Additionally, thanks to also applying of “plug-in” technology and a special interface of hardware, this solution exhibits some high compatibility with different pedigree numerical control (NC) systems, such as Fanuc, Siemens, Cincinnati and so on. In order to improve CANBus for DNC application, a communicating competition model of the basic CAN protocol, called CC model, is then highlighted. This model is able to satisfy the requirements that different machine tools share the communicating bandwidth fairly when they run concurrently. Finally the novel view of the latest advancement in CANBus-based DNC in combination with the manufacturing paradigm is also presented.
2003, 17(4).
Abstract:
A new method of parameter identification based on linear time-frequency representation and Hilbert transform is proposed to identify modal parameters of linear time-varying systems from measured vibration responses. Using Gabor expansion and synthesis theory, measured responses are represented in the time-frequency domain and modal components are reconstructed by time-frequency filtering. The Hilbert transform is applied to obtain time histories of the amplitude and phase angle of each modal component, from which time-varying frequencies and damping ratios are identified. The proposed method has been demonstrated with a numerical example in which a linear time-varying system of two degrees of freedom is used to validate the identification scheme based on time-frequency representation. Simulation results have indicated that time-frequency representation presents an effective tool for modal parameter identification of time-varying systems.
A new method of parameter identification based on linear time-frequency representation and Hilbert transform is proposed to identify modal parameters of linear time-varying systems from measured vibration responses. Using Gabor expansion and synthesis theory, measured responses are represented in the time-frequency domain and modal components are reconstructed by time-frequency filtering. The Hilbert transform is applied to obtain time histories of the amplitude and phase angle of each modal component, from which time-varying frequencies and damping ratios are identified. The proposed method has been demonstrated with a numerical example in which a linear time-varying system of two degrees of freedom is used to validate the identification scheme based on time-frequency representation. Simulation results have indicated that time-frequency representation presents an effective tool for modal parameter identification of time-varying systems.
2003, 17(4).
Abstract:
As far as the vibration signal processing is concerned, composition of vibration signal resulting from incipient localized faults in gearbox is too weak to be detected by traditional detecting technology available now. The method, which includes two steps: vibration signal from gearbox is first processed by synchronous average sampling technique and then it is analyzed by complex continuous wavelet transform to diagnose gear fault, is introduced. Two different kinds of faults in the gearbox, I.e. shaft eccentricity and initial crack in tooth fillet, are detected and distinguished from each other successfully.
As far as the vibration signal processing is concerned, composition of vibration signal resulting from incipient localized faults in gearbox is too weak to be detected by traditional detecting technology available now. The method, which includes two steps: vibration signal from gearbox is first processed by synchronous average sampling technique and then it is analyzed by complex continuous wavelet transform to diagnose gear fault, is introduced. Two different kinds of faults in the gearbox, I.e. shaft eccentricity and initial crack in tooth fillet, are detected and distinguished from each other successfully.
2003, 17(4).
Abstract:
According to advantages of neural network and characteristics of operating procedures of engine，a new strategy is represented on the control of fuel injection and ignition timing of gasoline engine based on improved BP network algorithm．The optimum ignition advance angle and fuel injection pulse band of engine under different speed and load are tested for the samples training network, focusing on the study of the design method and procedure of BP neural network in engine injection and ignition control. The results show that artificial neural network technique can meet the requirement of engine injection and ignition control．The method is feasible for improving power performance, economy and emission performances of gasoline engine.
According to advantages of neural network and characteristics of operating procedures of engine，a new strategy is represented on the control of fuel injection and ignition timing of gasoline engine based on improved BP network algorithm．The optimum ignition advance angle and fuel injection pulse band of engine under different speed and load are tested for the samples training network, focusing on the study of the design method and procedure of BP neural network in engine injection and ignition control. The results show that artificial neural network technique can meet the requirement of engine injection and ignition control．The method is feasible for improving power performance, economy and emission performances of gasoline engine.
2003, 17(4).
Abstract:
Virtual product development (VPD) is essentially based on simulation. Due to computational inefficiency, traditional engineering simulation software and optimization methods are inadequate to analyze optimization problems in VPD. Optimization method based on simulation metamodel for virtual product development is proposed to satisfy the needs of complex optimal designs driven by VPD. This method extends the current design of experiments (DOE) by various metamodeling technologies. Simulation metamodels are built to approximate detailed simulation codes, so as to provide link between optimization and simulation, or serve as a bridge for simulation software integration among different domains. An example of optimal design for composite material structure is used to demonstrate the newly introduced method.
Virtual product development (VPD) is essentially based on simulation. Due to computational inefficiency, traditional engineering simulation software and optimization methods are inadequate to analyze optimization problems in VPD. Optimization method based on simulation metamodel for virtual product development is proposed to satisfy the needs of complex optimal designs driven by VPD. This method extends the current design of experiments (DOE) by various metamodeling technologies. Simulation metamodels are built to approximate detailed simulation codes, so as to provide link between optimization and simulation, or serve as a bridge for simulation software integration among different domains. An example of optimal design for composite material structure is used to demonstrate the newly introduced method.
2003, 17(4).
Abstract:
A quality monitoring method by means of support vector machines (SVM) for robotized gas metal arc welding (GMAW) is introduced. Through the feature extraction of the welding process signal, a SVM classifier is constructed to establish the relationship between the feature of process parameters and the quality of weld penetration. Under the samples obtained from auto parts welding production line, the learning machine with a radial basis function kernel shows good performance. And this method can be feasible to identify defect online in welding production.
A quality monitoring method by means of support vector machines (SVM) for robotized gas metal arc welding (GMAW) is introduced. Through the feature extraction of the welding process signal, a SVM classifier is constructed to establish the relationship between the feature of process parameters and the quality of weld penetration. Under the samples obtained from auto parts welding production line, the learning machine with a radial basis function kernel shows good performance. And this method can be feasible to identify defect online in welding production.
2003, 17(4).
Abstract:
According to the principle of the magnetostriction generating mechanism, the control model of giant magnetostriction material based on magnetic field and the control method with magnetic flux density are developed. Furthermore, this control method is used to develop a giant magnetostrictive micro-displacement actuator (GMA) and its driving system. Two control methods whose control variables are current intensity and magnetic flux density are compared with each other by experimental studies. Finally, effective methods on improving the linearity and control precision of micro-displacement actuator and reducing the hysteresis based on the controlling magnetic flux density are obtained.
According to the principle of the magnetostriction generating mechanism, the control model of giant magnetostriction material based on magnetic field and the control method with magnetic flux density are developed. Furthermore, this control method is used to develop a giant magnetostrictive micro-displacement actuator (GMA) and its driving system. Two control methods whose control variables are current intensity and magnetic flux density are compared with each other by experimental studies. Finally, effective methods on improving the linearity and control precision of micro-displacement actuator and reducing the hysteresis based on the controlling magnetic flux density are obtained.
2003, 17(4).
Abstract:
A new method for recovering shape from cross-sectional contours with complex branching structures is presented. First, each branching problem by providing an intermediate contour using distance function and image processing technology is solved. Then, all contours are divided into several groups of simple contours. For each group, a NURBS curve is fitted to contour points in each section within a given accuracy on a common knot vector. Finally, the NURBS surface skinning of these contours is performed for providing a smooth geometric model. The method is suitable to reproduce the object by NC machining or rapid prototyping. Some results demonstrate its usefulness and feasibility.
A new method for recovering shape from cross-sectional contours with complex branching structures is presented. First, each branching problem by providing an intermediate contour using distance function and image processing technology is solved. Then, all contours are divided into several groups of simple contours. For each group, a NURBS curve is fitted to contour points in each section within a given accuracy on a common knot vector. Finally, the NURBS surface skinning of these contours is performed for providing a smooth geometric model. The method is suitable to reproduce the object by NC machining or rapid prototyping. Some results demonstrate its usefulness and feasibility.
2003, 17(4).
Abstract:
Flexible spinning is a new type of spinning process where spin-forming is performed without using a mandrel. Combining shearing and rolling processes, the calculation formulas of the spinning forces in flexible spinning of cones is presented. The effects of the main processing parameters, such as gripping force G applied to the blank by the inner roller, the feed rate of rollers f and the roundness radius of outer roller ro, on the spinning forces are analyzed experimentally and theoretically.
Flexible spinning is a new type of spinning process where spin-forming is performed without using a mandrel. Combining shearing and rolling processes, the calculation formulas of the spinning forces in flexible spinning of cones is presented. The effects of the main processing parameters, such as gripping force G applied to the blank by the inner roller, the feed rate of rollers f and the roundness radius of outer roller ro, on the spinning forces are analyzed experimentally and theoretically.
2003, 17(4).
Abstract:
Thermomechanical phenomena occurring between friction pairs greatly change the distributions of lining pressure and friction surface temperature of a multiple disc wet brake. It has become one of the main causes of brake failure. In order to understand these thermomechanical phenomena, several design and material factors that have great influence on thermomechanical phenomena, such as heat transfer coefficient, friction factor, sliding velocity, initial lining pressure and so on, are analyzed. An isothermal design method is proposed for designing a multi-ple disc wet brake.
Thermomechanical phenomena occurring between friction pairs greatly change the distributions of lining pressure and friction surface temperature of a multiple disc wet brake. It has become one of the main causes of brake failure. In order to understand these thermomechanical phenomena, several design and material factors that have great influence on thermomechanical phenomena, such as heat transfer coefficient, friction factor, sliding velocity, initial lining pressure and so on, are analyzed. An isothermal design method is proposed for designing a multi-ple disc wet brake.
2003, 17(4).
Abstract:
A framework for building EDM collaborative manufacturing system using multi-agent technology to support organizations characterized by physically distributed, enterprise-wide, heterogeneous intelligent manufacturing system over Internet is proposed. Expert system theory is introduced. Design, manufacturing and technological knowledge are shared using artificial intelligence and web techniques by EDM-CADagent, EDM-CAMagent and EDM-CAPPagent. System structure, design process, network conditions, realization methods and other key techniques are discussed. Instances are also introduced to testify feasibility.
A framework for building EDM collaborative manufacturing system using multi-agent technology to support organizations characterized by physically distributed, enterprise-wide, heterogeneous intelligent manufacturing system over Internet is proposed. Expert system theory is introduced. Design, manufacturing and technological knowledge are shared using artificial intelligence and web techniques by EDM-CADagent, EDM-CAMagent and EDM-CAPPagent. System structure, design process, network conditions, realization methods and other key techniques are discussed. Instances are also introduced to testify feasibility.
2003, 17(4).
Abstract:
A design methodology for multi-agent systems is proposed. The systemic framework of CAPP and scheduling integrated multi-agent system according to design methodology is researched. Agent model, composition model and cooperation model are discussed respectively in the multi-agent system. Static composition model and dynamic running model of CAPP and scheduling integrated system are presented in composition model. Communication model, language model and protocol model are discussed in corporation model. CSIMAS, CAPP and scheduling integrated multi-agent prototype system, is developed to illuminate system model. Multiple non-rotational parts are tested in distributed process planning and scheduling environment of CSIMAS.
A design methodology for multi-agent systems is proposed. The systemic framework of CAPP and scheduling integrated multi-agent system according to design methodology is researched. Agent model, composition model and cooperation model are discussed respectively in the multi-agent system. Static composition model and dynamic running model of CAPP and scheduling integrated system are presented in composition model. Communication model, language model and protocol model are discussed in corporation model. CSIMAS, CAPP and scheduling integrated multi-agent prototype system, is developed to illuminate system model. Multiple non-rotational parts are tested in distributed process planning and scheduling environment of CSIMAS.
2003, 17(4).
Abstract:
The successful implementation of mass customization lies on reengineering technology and management methods to organize the production. Especially in assembly phase, various product configurations, due-time penalties and order-driven strategy challenge the traditional operation and management of assembly lines. The business features and the operation pattern of assembly line based on mass customization are analyzed. And the research emphatically studies various technologic factors to improve customer satisfaction and their corresponding implement methods in operating assembly line. In addition, the models are proposed for operating assembly line under dynamic process environment in mass customization. A genetic approach is developed to provide the optimal solution to the models. The effectiveness of the proposed approach is evaluated with an industrial application.
The successful implementation of mass customization lies on reengineering technology and management methods to organize the production. Especially in assembly phase, various product configurations, due-time penalties and order-driven strategy challenge the traditional operation and management of assembly lines. The business features and the operation pattern of assembly line based on mass customization are analyzed. And the research emphatically studies various technologic factors to improve customer satisfaction and their corresponding implement methods in operating assembly line. In addition, the models are proposed for operating assembly line under dynamic process environment in mass customization. A genetic approach is developed to provide the optimal solution to the models. The effectiveness of the proposed approach is evaluated with an industrial application.
2003, 17(4).
Abstract:
The nonlinear dynamic responses of viscoelastic axially transmission belts are investigated and the Kelvin viscoelastic differential constitutive model is employed to characterize the material property of belts. The general-ized equation of motion is obtained for a viscoelatic axially transmission belts with geometric nonlinearity first, and then is reduced to be a set of second-order nonlinear ordinary differential equations by applying Galerkin's method. Finally, the effects of viscosity parameter and elastic parameter and the moving velocity of the belts on the transient responses are investigated by the research of digital simulation.
The nonlinear dynamic responses of viscoelastic axially transmission belts are investigated and the Kelvin viscoelastic differential constitutive model is employed to characterize the material property of belts. The general-ized equation of motion is obtained for a viscoelatic axially transmission belts with geometric nonlinearity first, and then is reduced to be a set of second-order nonlinear ordinary differential equations by applying Galerkin's method. Finally, the effects of viscosity parameter and elastic parameter and the moving velocity of the belts on the transient responses are investigated by the research of digital simulation.
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