bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation and Photoelectric Performance of Eu3+-Doped Porous TiO2 Thin Film Electrode
Authors: Zhou Yi , Huang Ke Long , Dang Ming Ming , Li Hong , Lv Cai Xia , Shi De Hui
Published: March 2010

The nanoporous TiO2 film doped Eu3+ were prepared by combining the sol-gel and hydrothermal method, which could be applied to dye-sensitized solar cells(DSSC). The films were characterized by XRD, SEM and UV-vis DRS. DSSC photoelectric properties were evaluated by recording current-voltage characteristics under simulated sunlight illumination. The results indicated that Eu3+-doped TiO2 film electrodes increased short-circuit current and the fill facter availably; when TiO2 doping concentration for Eu3+ was 2.0mol%, a short circuit current of 0.389mA, an open circuit voltage of 0.6006V and a fill factor of 0.60 were obtained, which was remarkably better than of undoped TiO2 film electrode; and the optimal thickness attained in this work was 17.2um.
A Hybrid Pso and Shuffled Complex Evolution Algorithm for Order Assignment Problem in Holonic Manufacturing System
Authors: Zhao Fu Qing , Zou Jian Hua , Sheng Shang Xiong
Published: March 2010

Today’s market dynamics have made operation process in manufacturing system extremely complex and difficult. Enterprise need to continuous adjust its strategies on evaluating and designing their task and order assignment methods to provide products at the lowest possible cost while reducing the total lead time. The evaluation model based on Holonic Manufacturing System is presented in this paper. The model incorporates operation cost and lead time as the object. A hybrid PSO algorithm with Shuffled Complex Evolution Algorithm(SCE) is utilized to compute the combination optimum for Order assignment problem . Simulation result shows that the model and the algorithm are effective to the problem.
Evaluation of Electrospun Poly (Vinyl Alcohol) (PVA)/Gelatin Nanofiber Membrane and Biocompatibility
Authors: Huang Chao Chiung , Lu Chao Tsang , Chao Chieh Yu , Huang Tina Cu , Lou Ching Wen , Lin Jia Horng
Published: March 2010

PVA and gelatin mixed in various volume ratios (100:0, 90:20, 80:20, 70:30, 60:40, 50:50, to 0:100). The effects of the volume ratio on the spinnability of PVA/gelatin solutions were evaluated. The effect on the electrospun nanofiber of PVA/gelatin was examined by IR spectroscopy. Experimental results have demonstrated that solutions of PVA/gelatin in a volume ratio of 80/20 had good spinnability. As the electric field increased, the numbers of beads and droplet decreased. IR spectra demonstrated strong intermolecular hydrogen bonds between the molecules of gelatin and PVA. In this investigation, the best electric field for electrospinning was 0.68 kV/cm. The critical electric field for electrospinning is 0.5 kV/cm.
Effect of Ultrasonic Wave on Melt Foaming Process of Aluminum Foam
Authors: Wang Jun , He Zhan Shu , Wu Ju Hong , Wan Zhen Ping
Published: March 2010

In this paper the formation and growth of bubbles during the melt foaming process are studied from microcosmic aspect. The forming process of liquid film between two neighboring bubbles is also analyzed. According to the cavity effect of ultrasonic wave, the effect of ultrasonic wave on the fragmentation of cell structures of aluminum foam is investigated. Results show that the effect of ultrasonic wave on the cell structure fragmentation decreases with the increase of the distance from the ultrasonic wave source to the cell structure. Therefore, a new concept, namely aluminum foam of biomimetic gradient structure, is proposed.
Effect of Water Glass on Compressive Strength of Aluminosilicate-Based Geopolymer
Authors: Kim Jin Tae , Seo Dong Seok , Kim Gab Joong , Lee Jong Kook
Published: March 2010

The inorganic binders, fly ash and meta kaolin were used to prepare geopolymer. Water glass was added to the recycled inorganic binders to improve compressive strength of geopolymers. The ratio of the solid materials (inorganic binder and alkali activators) and liquid materials (distilled water, water glass) for the polymerization was optimized as 3:1. Compressive strength of the geopolymers increased because water glass improved the extent of polymerization of the inorganic binder and resulted in dense microstructure. It was found that geopolymers using fly ash showed the higher value of compressive strength, compared with meta kaolin- based geopolymers.
High Intensity Glassed-Block Was Prepared by Fluid Cinder
Authors: Xu Ying , Dou Yu Bo
Published: March 2010

High temperature fluid slag was used as main material, and high intensity glassed-block was prepared though internal latent heat. The influence of prepared process conditions on products characteristic was inspected, and the reaction phenomena were rationally explained. The rational process conditions were finally available, fluid cinder glassed-block was obtained, and it has such excellence as: high hardness and intensity, low water absorption, good acid fastness and alkali tolerance.
Simulating Production Lines of Recycling WEEE Products in eM-Plant
Authors: Wang Jun Jun , Wu Yong Ming
Published: March 2010

The materials and combination of Waste Electrical and Electronic Equipments (WEEE) are complex and special, so the recycling technological process of WEEE is complicated and its recycling production line is difficult to be constructed. To improve the rate of parts reuse, the purity and quality of recycling materials with lower cost, it is necessary to manually disassemble WEEE products as much as possible. The recycling production line is simulated through the eM-Plant software to find out its bottleneck procedures. The bottleneck procedures are eliminated through the method of parallel process. The production efficiency, cost, logistics, staff and flexibility of the production line are analyzed through simulation.
The Theoretical Analysis and Experimental Study on Heat-Transfer in Cryogenic Pneumatic Mist Jet Cooling
Authors: Ren Jia Long , Guan Xiao Yan
Published: March 2010

Based on the pool film boiling, the paper discusses the heat transfer coefficient of fogdrop jet into cutting zone to cool high temperature wall and then founds the model. It can be concluded by transient test in cryogenic pneumatic mist jet cooling high temperature titanium surface with different water flow, that when reaching the best cooling effect, the water flow of cryogenic pneumatic mist jet cooling as well as the materials vaporizing and involving phase change heat-transfer under certain temperature must be equivalent, and at that time, the heat transfer coefficient of cryogenic pneumatic mist jet cooling will reach the maximum.
An Optimization of Two-Steps Curing Profile to Eliminate Voids Formation in Underfill Epoxy for Hi-CTE Flip Chip Packaging
Authors: Kornain Zainudin , Jalar Azman , Rashid Rozaidi , Abdullah Shahrum
Published: March 2010

Underfilling is the preferred process to reduce the impact of the thermal stress that results from the mismatch in the coefficient of thermal expansion (CTE) between the silicon chip and the substrate in Flip Chip Packaging. Voids formation in underfill is considered as failure in flip chip manufacturing process. Voids formation possibly caused by several factors such as poor soldering and flux residue during die attach process, voids entrapment due moisture contamination, dispense pattern process and setting up the curing process. This paper presents the optimization of two steps curing profile in order to reduce voids formation in underfill for Hi-CTE Flip Chip Ceramic Ball Grid Array Package (FC-CBGA). A C-Mode Scanning Aqoustic Microscopy (C-SAM) was used to scan the total count of voids after curing process. Statistic analysis was conducted to analyze the suitable curing profile in order to minimize or eliminate the voids formation. It was shown that the two steps curing profile provided solution for void elimination.
A New Type of Cooling-Air Generator for Cooling-Air Grinding
Authors: Cai Yu Lin , Zhang Hua , Liu Ye Feng , Zhao Huan Huan , Yao Jun , Huang Hai Tao
Published: March 2010

Cooling-air grinding is one sustainably alternative processing technology to traditional grinding. In order to study the discipline and characteristic of cooling-air grinding, a new type of cooling-air generator for cooling-air grinding was designed and set up in the paper. And the compressed air of the system and the main processing equipment were introduced in detail. Performance tests showed that the device was able to meet the design requirements.
A Wireless Solution of Distributed Monitoring and Control System in Optical Aspheric Grinding
Authors: Jiang Chen , Guo Yin Biao , Yang Wei , Han Chun Guang , Huang Hai Bin
Published: March 2010

This paper presents a wireless distributed monitoring and system in optical aspheric grinding environment. The architecture of proposed system and the details of monitoring strategy are discussed according to the characteristic of optical aspheric grinding. The results of experiments have shown that the proposed system can be used effectively in optical aspheric grinding.
Exploration and Application of Process Approximation Method on Cleaner Process Evaluation
Authors: Liu Ying , Huang Ran , Xu Yan Fei
Published: March 2010

Cleaner process evaluation is an important part of cleaner process design. Through a case study, this paper elaborates the steps and principles of the application of process approximation method, which is one method of cleaner process evaluation.
Experimental Study on Heat Transfer Characteristics of Apparatus for Recovering the Waste Heat of Blast Furnace Slag
Authors: Liu Jun Xiang , Yu Qing Bo , Dou Chen Xi , Li Rong
Published: March 2010

Dry granulation, as a new process of molten BF slag treatment, is an attractive alternative to water quenching. The medium in the heat exchanging process is air which results in low efficiency. Therefore, the technique for waste heat of molten BF slag recovery is exploited. The waste heat is recovered by waste heat boiler which produces high pressure steam for generating electricity. The heat transfer characteristics of apparatus were investigated. The results show that the overall heat transfer coefficient can reach 111W/ (m2•K) and the heat recovery can reach 90% at most. If slag granule diameter is less than 2.5mm and descending velocity is higher than 1.0mm/s, the cooling rate of slag granule is over 10K/s. Then slag granules can be used as nicer materials to produce Portland cement. When slag granule descending velocity equaled to 1.1mm/s and the flux of water equaled to 0.15m3/h, small quantity of steam appeared in the first and second row tubes. They proved the feasibility of this technique. The application of this technique has a significant social meaning.
Feasibility Study for the System of Coal Gasification by Molten Blast Furnace Slag
Authors: Li Peng , Qin Qin , Yu Qing Bo , Du Wen Ya
Published: March 2010

At present, molten blast furnace slag is quenched rapidly using a large amount of water to produce a glassy-granulated slag without any recovery of its much sensible heat, polluting water and atmosphere. To solve these problems, a new heat recovery system is proposed. This system consists of melting gasifier, the 2nd gasifier and boiler in order to achieve stepped energy using. The melting gasifier and the 2nd gasifier use the endothermic heat of gasification reaction instead of sensible heat to recover the energy of molten blast furnace slag. The possibility of the new heat recovery system is studied. The reactions in melting gasifier are studied using STA409PC thermal analyzer and HSC chemistry software. The economic and environmental benefits are calculated based on the heat and mass balances. The results indicate that this method is possible and better than conventional methods such as hot water or steam production. The molten BF slag acts as not only thermal media but also good catalyst. The efficiency of melting gasifier is high and without pollution. Besides, this method can bring huge economic and environmental benefits which are important to the survival and sustainable development of iron-steel enterprises.
Study on MQL in Point Grinding Process for Green Manufacturing
Authors: Xiu Shu Dong , Geng Zhi Jie
Published: March 2010

In point grinding process, the contact area of point grinding is much smaller than that of conventional cylindrical grinding under same conditions, so the grinding power and heat to measure is lower and the cooling condition is improved obviously. For green manufacturing, the point grinding process has the significance to reduce the consumption of grinding fluid and improve ground surface integrity and greenness. This study analyzes the geometric configuration of the contact area between wheel and workpiece in point grinding process, establishes the geometric and mathematic models of the contact area, and investigates the relations between the grinding parameters and the grinding power by the simulations. The MQL and semi-dry point grinding experiments are performed on the ground surface integrity. These investigations show that the MQL and semi-dry grinding can be achieved in point grinding process under less contact area and higher jet pressure condition for the high greenness demand.
Research on Stamping of Aluminum Alloy Hemispherical Components Based on Numerical Simulation and Experiments
Authors: Han Cheng Jun , Lin Xin Bo , Li Yan Bo
Published: March 2010

Experimental research on stamping of wrought aluminum alloy has been an important issue at home and abroad. In this paper, taking stamping of aluminum alloy hemispherical components for example, the effects of blank holder force (BHF) on stamping forming process of aluminum alloy are explored by methods of experiments and numerical simulation. Through experiments, the forming laws of hemispherical components are found out. The research shows that the BHF has significant effects on the quality of stamping components and reasonable BHF can greatly improve the formability of hemispherical components. Additionally, by applying simulation software in stamping, the development circle of product and its moulds can be shortened, and product quality and its competitiveness in the market can be improved.
H-Infinity Robust Control Methodology of Multi-Variable NCSs
Authors: Wei Li Sheng , Jiang Ming , Chen Qi Gong , Fei Min Rui
Published: March 2010

This note investigates H-infinity robust controller design for uncertain multi-variable networked control systems with disturbance. The complete mathematical model is derived. And the sufficient condition for asymptotical stability is analyzed by using 2nd Lyapunov stability theory combined with free-weighting matrices techniques. The existence of such a controller is given in terms of the solvability of linear matrix inequalities. The efficacy and feasibility of the proposed methods is shown by presenting simulation results.
Evaluating Process Design through Quality Function Deployment for Environment
Authors: Wu Yong Ming , Yang Zhou Hui
Published: March 2010

Quality Function Deployment for Environment (QFDE) is an effective eco-design tool to transform the voices of customer and environment into the engineering metrics for evaluating product design. From the viewpoint of green manufacturing, machining process design is focused on by many manufacturers and it is necessary to evaluate its environmental impact. The QFDE method is developed to evaluate machining process design with the new house of quality. According to the evaluation, design engineers can identify which part characteristics and their machining processes should be focused on and then know how to improve the product design. A case of an engine is studied to illustrate the proposed method.
Velocity Control Method for Continuous Short Line Segment High-Speed Machining Based on Transition of Parametric Spline
Authors: Zhang Li Bing , You You Peng , He Jun , Liu Jun
Published: March 2010

To enhance the velocity profile’s smoothness and machining efficiency of continuous short line segments, a velocity smooth control algorithm was presented based on the transition of cubic parametric spline curves. The transitional mathematical model was constructed, and an improved S-shaped jerk-limited acceleration/deceleration algorithm with look-ahead was adopted for smoother velocity profiles. The simulation and experiment results showed that machining efficiency was greatly improved, and smoother velocity profile was achieved, which approved the feasibility and validity of the proposed method.
A Production Scheduling Method for Bell-Type Batch Annealing Shop
Authors: Zhao Jun , Wang Wei , Lin Yong Li
Published: March 2010

A discrete event simulation approach based on heuristics is presented to emulate the production process of the bell-type batch annealing in this paper. For optimizing the scheduling objective of minimizing the resource free ratio, an improved Differential Evolution algorithm is proposed, which solves a class of discrete problem, and whose crossover probability is adaptively assigned in order to improve the search ability not only on local but also on global. The experiments using practical production data demonstrate that the proposed method has a great effectiveness, and increases the production efficiency of the bell-type annealing shop.
A Symbolic OBDD-Based Algorithm for Assembly Sequence Planning
Authors: Li Feng Ying , Gu Tian Long , Chang Liang
Published: March 2010

Algorithms based on timed Petri net are competitive for solving the problem of assembly sequence planning (ASP). In order to alleviate the state-space explosion problem which is caused by the Petri net-based representation of assembly sequences and to improve the efficiency of planning algorithms, an approach based on ordinary binary decision diagrams (OBDDs) is presented in this paper. On the one hand, all the timed transitions in Petri nets are substituted by some technically designed timed transition structures; on the other hand, Petri nets used in algorithms of assembly sequence planning are represented symbolically as OBDDs. As a result, a novel assembly sequence planning algorithm based on symbolic OBDDs is presented. With the help of OBDDs, both the marking vectors and the states of Petri nets are formulated more compactly; at the same time, the searching processes can be manipulated implicitly. Therefore, compared with original algorithms, both the time performance and the space performance are improved.
An Improved Genetic Algorithm for Multi-Objective Flexible Job-Shop Scheduling Problem
Authors: Zhang Chao Yong , Wang Xiao Juan , Gao Liang
Published: March 2010

Flexible job shop scheduling problem (FJSP) is an extended traditional job shop scheduling problem, which more approximates to real scheduling problems. This paper presents a multi-objective genetic algorithm (GA) based on immune and entropy principle to solve the multi-objective FJSP. In this improved multi-objective GA, the immune and entropy principle is used to keep the diversity of individuals and overcome the problem of premature convergence. Advanced crossover and mutation operators are proposed to adapt to this special chromosome structure. The proposed algorithm is evaluated on three representative instances and the computational results and comparison with some other approaches show that the proposed multi-objective algorithm is effective and potential.
Optimum Design on Trapezoidal Thread Parameters of Co-Rotating Twin Screw Extruder
Authors: Wang Ping , Shen Xiao Yang , Zong Xian Liang
Published: March 2010

In order to design trapezoidal thread parameters of co-rotating twin screw extruder that is used in non-fused materials processing, based on geometry of fully wiped co-rotating twin screw extruder by M. L. Booy, the paper adopts tangential approximation method to determine the parameters of trapezoidal thread choosing tangent of especial point of normal section curve. And reasonable spans of oblique angle, actual top width of flight, channel depth and thread lead are determined by the optimum design with objective function of maximal theoretical flux. Experiments show that a co-rotating twin screw pulping extruder of trapezoidal thread designed by the method is easier to machine and measure, and pulp processed by the twin screw pulping extruder can meet the quality requirements. Thus, twin screw designed by the method reserves the main strongpoint of the fully wiped co-rotating twin screw extruder.
Optimization of Printed Circuit Board Assignment and Component Allocation in Assembly Line
Authors: Du Xuan , Li Zong Bin , Zhang Guo Hui
Published: March 2010

The assembly optimization problem of multiple printed circuit board (PCB) tasks is analyzed, and an optimal model is formulated to balance the workload in decoupled PCB assembly line. Combined with polychromatic sets and genetic algorithm (GA), an integrated methodology is developed to solve the PCB assignment and component allocation simultaneously. Based on polychromatic sets theory, a 3D numerical contour matrix is presented to describe the characters of PCB, component and machine and the constraint of machine and process, and a constraint model is formulated. Constraint model guarantees that GA searches in the available solution space and simplify the calculation of fitness value and GA operation. Computational results indicate that the approach presented in this paper is useful and effective.
Study on the Scheduling Problem of Powder Painting Production - A Case Study
Authors: Hu Zhang Yong , Su Qiang , Liu Jun , Yang Hai Xia
Published: March 2010

A large-scale powder-painting scheduling problem is explored. The purpose is to find out the optimal sequence of a number of batches that dynamically arrive from upstream processes within a given scheduling horizon. The objective is to enhance the production efficiency and decrease the production cost as well. To solve this problem, a mixed integer nonlinear programming (MINLP) model is constructed and an algorithm called greedy randomized adaptive search procedure (GRASP) is designed. Case studies demonstrate that the proposed approach can improve the production performance significantly.
Improved Adaptive Genetic Algorithms for Job Shop Scheduling Problems
Authors: Liu Mei Hong , Peng Xiong Feng
Published: March 2010

In this paper, the adaptability of the genetic algorithm (GA) is considered. Two improved adaptive genetic algorithms (AGA) which are called Ch-AGA and Th-AGA for short are proposed based on the previous AGA. The crossover probability and the mutation probability of the Ch-AGA and the Th-AGA are non-linear changed between some a certain region, and adopted the mathematical function of chx and thx respectively. The two improved adaptive genetic algorithms are used to solve the classical job shop scheduling problems and the results indicate that the algorithms are more effective and more efficient than previous AGA, and should be used in practical applications.
Research on Dynamic Reconfigurable Manufacturing Process Framework Based on MDA
Authors: Huang Hai Long , Liu Fei , Cao Le
Published: March 2010

With the characteristic analysis of manufacturing process in various manufacture enterprises, Model Driven Architecture methodology is applied to construct dynamic reconfigurable manufacturing process model, which can solve the problems of portability, information integration, and interoperability effectively. A dynamic reconfigurable modeling process framework based on model driven Architecture is introduced for manufacture enterprises in this paper. It separates the manufacturing system functionality specification from its implementation on any specific technology platform, and makes the system reconfigurate the manufacturing progress through the transformation of models and transmission of information. At last, the integrated system was applied to a discreet manufacturing process and the application result proves that the system is practical and effective.
Analysis and Stress Optimization Design of an S-Shaped Micro Spring
Authors: Li Li Shun , Meng Xiang De , Li Hong Xun
Published: March 2010

The stress distribution of an S-shaped micro spring fabricated by the micro-electro-mechanical-system (MEMS) technology was analyzed by the finite-element method (FEM) using ANSYS software, which showed that the stress concentration is located in the inner corner of the turning round. To reduce the maximum stress but not change the spring coefficient, an optimization S-shaped micro spring with the slope cross section was designed. The width of one end of the turning round is increased from the original 80μm to 100μm, while the other is decreased from 80μm to 21.5μm. The spring coefficient formula of the optimization S-shaped micro spring was calculated out by the Castigliano second law, and the difference between the formula and the FEM is 2.7%. At the same time the FEM simulation shows that the maximum stress of the optimization S-shaped micro spring can be reduced by 32.7% while the spring coefficient is the same comparing with the primary S-shaped micro spring, which shows that the mechanical performance of the optimization S-shaped micro spring is better than that of the primary S-shaped micro spring.
Design and its Experiments of Micro Electrochemical Machining System
Authors: Li Yuan Bo , Zhang Yong Jun , Guo Zhong Ning
Published: March 2010

A micro Electrochemical Machining (ECM) system has been developed, and macro/micro complex feed mechanism has been presented in order to achieve high-resolution. A nanosecond pulse power supply for micro-ECM has been developed, and the minimum pulse width can reach 50 ns. Complementary chopper circuit has been designed to avoid waveform distortion, which can achieve higher pulse frequency. A series of ECM experiments using the machining system have been carried out, and results of tests have proved that high-resolution spindle, and high frequency, short pulse width power supply help to achieve better quality surface, higher machining accuracy.
Research for Combustor Based on Micro-Thermoelectric Generator Device
Authors: Song Rui Yin , Wang Xian Cheng , Zhang Mei Qin
Published: March 2010

Micro-thermoelectric generator device (MTGD) is used to supply lasting electrical energy for Micro-electro-mechanical systems (MEMS). As an important part of MTGD, micro-combustor with high energy density has direct influence on the total electrical generating efficiency for MTG. D In this paper, Considering some parameters such as material, dimension, flux of fuel and shape of thermal conductive tunnel for micro-combustor, some simulation models such as thermal transfer, combustion for micro-combustor were built up, and some simulation results were got. Based upon, optimized micro flat combustors were designed and tested. The experiment results illustrated that the conduct efficiency of micro-combustor was well controlled by adjusting heat flux, and the combustor with shape of zigzag combustion tunnel has high thermal exchange efficiency in experiment models. By adjusting flux of fuel and the structure of micro premixed combustor, the heat loss of MTGD was reduced and output power was improved in a degree.
Ultra Precision Surface Grinding for Large Scale Non-Axisymmetric Aspheric Lens
Authors: Wang Zhen Zhong , Guo Yin Biao , Huang Hao , Lei Xiang Yang
Published: March 2010

Ultra precision grinding is currently the main technology for large scale advanced optical lens machining. In this paper, the machining system of ultra precision surface grinder is investigated. The experiments of new wedged aspheric lens with the dimension of 430*430mm have been conducted by SD600 diamond wheel, and the parallel grinding, cup truing and on-machine measuring are used for good accuracy. The results show the effective machining system and the problem for next research.
Experimental Study on Viscous Dissipaition of Polymer Melt in Micro-Channels
Authors: Yu Tong Min , Bei Hai Xin , Yan Ze Yu , Xu Bin , Xu Hua , Wu Yu
Published: March 2010

The polymer melts viscous dissipation effects of micro scale dimensions are different from that of macro-scale dimensions. In this paper, the temperature rises due to viscous dissipation were investigated when amorphous polymer material, PMMA, flows through several micro-channels with the diameters of 350μm, 500μm and different aspect ratios. The results indicate that, temperature rises reduce with the increase of inlet temperature of melt and increase with increasing channel’s diameter and aspect ratio at the same shear rate. The outlet temperature rises due to viscous dissipation in all micro channels increase with the increase of shear rate. In addition, the outlet temperature rise grows faster with the decrease of micro-channel’s diameter. Therefore, viscous dissipation effect is significant and should not be neglected in micro channel.
Production Logistics Simulation System for a Rail-Beam Plant Based on Component Technology
Authors: Liang Xue Dong , Yang Yu , Wang Yan Zhong , Wang Jing , Yin Sheng
Published: March 2010

The reusability and flexibility are essential aspects of logistics simulation for a big rail-beam plant with great demands of highway train projects in China recently. Currently, there is no sufficient facility or clear opinions provided by research work to address this. This paper presents an approach to meet rail-beam plant’s simulation requirements flexibly based on the component technology. A prototype system of a real-beam plant for bullet train in China is also developed to illustrate the feasibility and applicability.
Numerical Simulation and Experiment of Aluminum Sheet Metal Springback in New Quenching State
Authors: Chen Lei
Published: March 2010

2024-T3 aluminium sheet metal rubber forming process after quenching is studied. The tensile properties of 2024-T3 after quenching are measured. It is found that the yield strength and ultimate tensile strength are reduced, whilst total elongation value is increased. Springback character of rubber forming is studied by numerical method and springback compensation of rib flanging is studied. The simulation is compared with experiment. It is found that the tool shape considering springback is got using numerical method. The parts after springback achieve the design accuracy. So the method can be used in the application of rubber net forming.
The Research of Structural Optimization on Diesel Engine Injection Nozzle
Authors: Li Ming Hai , Cui Hong Jiang , Han Yun Dong , Li Ang
Published: March 2010

In order to improve the performance of 16 V280 diesel engine, the three-dimensional numerical models of the flow field in the nozzle which belongs to the injection system was built, and different detailed flow structures was captured under different pressure conditions. Through the analysis of the flow field, the unsuitable position of the nozzle was located, and the methods which combine CAD / CAM / CFD was applicated to optimize the structure of the nozzle. The analysis results indicate that with the increase of the injection pressure; the flow turbulence intensity increases; the more energy get lost, which was caused by turbulence; the coefficient of flow decreases. After the spray nozzle structure was changed into sphere pin valve, the mass flux under the same level of injection pressure was improved greatly.
Die-Pressing Parameters Optimization Based on FEA
Authors: Zhao Huai Rui , Li Qiang , Wang Sheng Wu
Published: March 2010

A method for combining the FEA softwares, I-DEAS and MSC.Marc, with the iSIGHT design platform is presented to optimize die –pressing (DP) process. In the optimization design, two kinds of optimization algorithms, genetic algorithm (GA) and sequential quadratic programming (SQP), are employed. The result reveals that the residual stress is minimum under conditions that die rake angel equals to 48.50, dieing depth1.9, and friction factor 0.065. The above results give preference to design dieing form tools and process parameters.
Dynamic Simulation of Position Servo System of Pneumatic Manipulator Based on AMESim and Simulink
Authors: Yuan Rui Bo , Sun Chun Geng , Lee Qing , Yang Hai Feng
Published: March 2010

The research works involved in a three freedoms line type pneumatic manipulator. The object is aimed to control of position servo system. According to the mathematic model of single freedoms pneumatic manipulator, AMESim and MATLAB were used for system control simulation, and made comparison between whether or not have PID controller in the pneumatic position servo system in the simulation, obtain Consistent results. The Results shown that PID control of the pneumatic position servo system has high steady-state accuracy, short adjusting time, little overshoot, and can overcome the nonlinear time—varying characteristics to some extent.
Virtual Machining on Helical Bevel Gear with New Type Heavy Duty Helical Bevel Gear Milling Machine Tool
Authors: Yan Li , Yi Tao , Jun Liu
Published: March 2010

The machining coordinate system of helical bevel gear machine tool is established through analyzing the machining mechanism of helical bevel gear, and the three dimensional structure model of the machine is also built adopting the new cutting feed method. The numerical control machining model of the machine is proposed. Finally, the virtual machining on one pair of given heavy duty helical bevel gears has been done, the virtual machining result indicates the virtual machining model meets the prospective design requirement.
Nonlinear Dynamic Behaviors and Bifurcation of Symmetrical Rotor System Supported by Self-Acting Gas Jounal Bearings
Authors: Wang Wei Min , Lu Yan Jun , Cao Zhi Jun , Zhang Yong Fang , Yu Lie
Published: March 2010

The unbalanced response and corresponding bifurcation behavior of the rotor dynamic system supported by gas journal bearings are investigated. A time-dependent mathematical model is used to describe the pressure distribution of gas journal bearing with nonlinearity. The rigid Jeffcott rotor with self-acting gas journal bearing supports is modeled. The finite difference method and the Successive Over Relaxation (S.O.R.) method are employed to solve the time-dependent Reynolds equation of gas journal bearings. The bifurcation of unbalanced responses of the rotor is analyzed by a Poincaré map. The numerical results reveal periodic, period-doubling, quasi-periodic, and chaotic motion of rich and complex non-linear behaviors of the system.
Molecular Dynamic Simulation on Mechanism of Ultrasonic Wire Bonding in Electronic Package
Authors: Ding Yong , Kim Jang Kyo , Zheng Rong Yue
Published: March 2010

The microscopic mechanism of ultrasonic wire bonding is investigated by molecular dynamics simulation on the interfacial contact and adhesion. Considering that the real bonding area is in the state of plane strain, a two-dimensional atomic model is presented. Sutton-Chen potential is adopted for the interaction between gold atoms. Computational results indicate that a strong adhesion generates at the interface after intimate contact between the wire and the bond pad, and the adhesive force should be the mechanism of ultrasonic wire bonding. Combining the real contact area from finite element analysis with the adhesive force from molecular dynamics simulation, the bonding strength of ultrasonic wire bonding is estimated.
CSP-Driven Schedule Optimization in NC Equipments Grid Considering Complex Correlated Process Flows
Authors: Lin Xin , Luo Ya Bo
Published: March 2010

Numerical Control (NC) equipments sharing over Internet is a potential approach for improving the utilization of capacity, which is still a complex NP hard difficulty due to the complexity of schedule. This research takes the Constraints Satisfied Problem (CSP) thinking to solve the above problem employing grid technology. First, regarding the NC equipments sharing as CSP, the CSP model for NC equipments grid is developed taking the flexible constraints as the optimum objective and the rigid constraints as the boundary conditions. Second, the detailed algorithm and steps for optimization of NC equipments grid workflow based on Just-In-Time (JIT) thinking are proposed. Finally the digital experiment demonstrates the advantages of the CSP-driven methodology that has the higher efficiency for searching optimum solution.
Hydroforming Simulation and Experiment on Al 5083 T-Shapes
Authors: Guo Xun Zhong , Tao Jie , Yuan Zheng
Published: March 2010

The hydroforming process to manufacture Al 5083 T-shapes with desired protrusion height and uniform thinning rate was evaluated by means of numerical simulation in this work. The optimization of process parameters and the prediction of forming effect were then carried out. Subsequently, the practical forming was performed based on the simulation results. It was obvious that the simulation results agreed well with the experimental ones. In addition, the streamline on the surface which formed in the hydroforming process was observed in the experiment.
The Studies on Influence of Assembling Technologic Parameters on Dynamic Characteristic of Sleeve Structure
Authors: Xu Cheng Dong , Hu Chun Sheng , Hu Wen Shu , He Yuan Yuan
Published: March 2010

Abstract. Sleeve structure is used to joint component parts of aerocraft or other product design and manufacture. It is an incompletely rigid joint. The contact stiffness of sleeve structure is non-linear and it must be taken into account for static or dynamic analysis. The assembling technology of sleeve structure is influenceable on the natural attributes of the structure. In this paper, nonlinear finite element method with the gap element of MSN/NASTRAN is combined with hammering test to simulate the nonlinear contact problem of sleeve structure design and manufacture. A novel method is used to define the close stiffness of gap element. Effect of assembling technologic parameters on inherent characteristic of sleeve structure are studied, such as diameter, quantity, arrangement mode of joint bolts and the prestressing force on bolts. Processes of sleeve structure assembling are proposed through theoretically analysis and simulating calculation.
Collection Mode Optimization of Casting Dust Based on TRIZ
Authors: Jiang Fan , Chen Wei Ping , Wang Yi Jun , Liu Xiao Chu
Published: March 2010

The massive dust is produced in the casting process, need to control. This paper takes electric arc furnace dust collection way as an example, where is in Guangdong Shaoguan Foundry and Forging Group Co., Ltd., establishes the conflict matrix about selection of the dust collection way, uses the TRIZ theory to solve, and obtains the standard solution, the results should provide the reference for collection way design of the electric arc furnace dust. The structure of half airtight cover is optimized by used of CFD, and the curve type is suitable shape to collect the dust.
Collaborative Manufacturing Resources Configuration Based on Summary Process Routes
Authors: Su Ying Ying , Wang Jian Rong , Wang Wan Shan
Published: March 2010

Aiming at manufacturing resources configuration in collaborative manufacturing environment, configuration flow with process tasks decomposition based on improved ant colony algorithm was proposed. Process tasks were decomposed based on summary process routes of parts and a multi-objective configuration model to collaborative manufacturing resources configuration was built. Basic ant colony algorithm was improved for solving this model by the combination of adaptive control and pheromone update mechanism. Pheromone is in the range of a max-min interval based on ant colony algorithm with the maximal-minimal pheromone limit. Compared to basic ant colony algorithm, superiority of improved ant colony algorithm was revealed by simulation example
A Wavelet-Based Finite Element Method for Modal Analysis of Beams
Authors: Xiang Jia Wei , Jiang Zhan Si , Xu Jin Yong
Published: March 2010

A new wavelet-based finite element method was proposed for analyzing modal parameters of beams. The Hermite cubic splines wavelet on the interval (HCSWI) was employed as the multi-scale interpolating basis for construct beam element. For the orthogonal characteristic of the wavelet basis with respect to given inner product, the corresponding multi-scale finite element equation will decoupled across scales totally or partially and suit for nesting approximation. Some numerical examples indicate that the proposed method have higher efficiency and precision.
Cause Analysis of Longitudinal Cracks in Closure Segment of an Extra-Large Bridge
Authors: Wei Chun Gen , Jiang Hai Bo , Huang Fei Xin , Ouyang Shi Wu , Long Xiang
Published: March 2010

The longitudinal cracks in the bottom slab of box girder have been found in lots of prestressed concrete continuous girder bridges in China, and the disease has been common by now. In this paper, a review of the causes of longitudinal crack is given. Then an analysis model is established by MIDAS/Civil 2006 to analyze the causes of longitudinal cracks in the bottom slab of an extra-large bridge. In calculations, dead load, vehicle load, prestressed load and temperature load etc are considered, and the distributions of transverse stress are obtained under three load combinations. The results show that the downward force caused by prestressed cables and the eccentric load under motor vehicles are the main factors which cause the appearance of these cracks. Finally, suggestions for the design and construction of such bridges are proposed to prevent the cracks, which can be referenced by relevant people.
A Simplified Method Study of Aluminium Alloy Fatigue Crack Tip Parameters Computed by Elastic-Plastic Finite Element Model
Authors: Song Xin , Xiang Jing Zhong , Zhang Jia Zhen
Published: March 2010

Fatigue crack propagation of aluminium alloy 7049-OA has been studied by non-linear finite element business-oriented software ABAQUS, and elastic-plastic finite element models of static fatigue crack and dynamic fatigue crack of center crack panel (CCP) specimens are also built. Based on the finite element computation results, the differences of stress and crack opening displacement around crack tip of static crack model have been compared with those of dynamic crack model. The compared results showed that the finite element computation results of dynamic crack model can be replaced by the results calculated by the static crack model. Fatigue crack tip parameters of aluminium alloy CCP specimens can be calculated by elastic-plastic finite element model of static crack. This is an effective method to cut down the computation expense and promote the computational efficiency.
The Experiment Research of Continual Extension of Surface Crack
Authors: Song Zhan Xun , Xie Ji Long , Zhao Huai Rui
Published: March 2010

The automatization of crack expand simulation is carried out by the programmer, using the simulation technique of singular unit, base on the ANSYS software. The nodes are dispersed by crack front. The singular unit is using to radiate from the nodes. The restriction is used at the edge of model. The stress intensity factor is worked out. The expansion ratio is confirmed. Then the displacement of crack expansion of the nodes is resolved. The way of expansion of crack front is orthogonal. The semi-ellipse curve of crack expand is worked out by numeric analysis. The simulation of crack expansion is carried out. The system of MTS（Material test system）810 from USA is used. And the experiment of crack expand is carried out with the load of tension. On the other side, the new crack front is fitted to get continual extension simulation.
Study on the Dynamic Behaviors of X70 Pipeline Steel by Numerical Simulation
Authors: Zhang Xiu Li , Mi Yi Ming , Ji Tao , Xu Hong Xia , Xie Yan Ting , Shen Ying
Published: March 2010

Using the commercial code ANSTS/LS-DYNA, this study has established a Split Hopkinson Pressure Bar (SHPB) finite element model (FEM) of X70 pipeline steel. Moreover, the stress-strain behavior of X70 pipeline steel has been investigated by a simplified Johnson-Cook model. The stress and strain relationship of X70 pipeline steel under different compact speeds is obtained under the high strain rate of 103S-1. The results obtained by numerical simulation agree well with those by experiments, and the parameters of Johnson-Cook model describe accurately the mechanical behaviors of X70 pipe line steel under high strain rate. This conclusion will serve as an important reference for developing and applying materials.
MATLAB-Based Kinematic Analysis on Mechanisms of Multifunctional Wheelchair
Authors: Li Ai Ping , Hu Jun , Zhang Jian Guo
Published: March 2010

This paper simplifies the upper limb lifting mechanism of the multifunctional wheelchair, takes the dynamic simulation tool Simulink of MATLAB as a platform, establishes a simulation model for kinematic analysis on the upper limb lifting mechanism, and executes the simulation after all parameters are set. The result shows that such simulation can help to conveniently and accurately get the motion parameters of the mechanism and optimize the parameters immediately, so that reference can be provided for type selection of this mechanism, it can be better understand the working condition of the multifunctional wheelchair, and complete the structure of product prototypes.
Hydraulic Performance Research of a Fixed Fire Water Monitor
Authors: Hu Guo Liang , Chen Wei Gang
Published: March 2010

A manual fixed fire water monitor of type 100 was designed. The monitor can rotate 360º in horizontal direction. It can rotate from the angle of -40º to the angle of 70º in vertical direction. The monitor spraying position can be adjusted by operating the handwheel and it can also automatically be locked. The flow simulation was completed using Fluent kits. The influence of the flow channel which affects the velocity and pressure field was analyzed. The energy loss was explained. The influence of the flow structure which affects the internal flow's turbulence and outlet velocity was obtained. The experiments were carried out on the test rig. The experimental results accorded with the simulation results in general. The relevant results can verify the reasonableness of the designed fire water monitor. It can provide some theory reference to the further optimization of the monitor design.
Effect of External Magnetic Field on the Flow and Heat Transfer in DC Arc Plasma Torch
Authors: Tang Da Pei , Gao Qing , Li Ying Hui , Lu Fan Xiu
Published: March 2010

A multiple fields’ coupled model of new magnetic controlled DC plasma torch, which was used for CVD diamond film, was presented. In this model, the effects of electric field and magnetic field on the flow field and temperature field were taken into account, and the fluid dynamics equations were modified by the addition of some source terms relating to electromagnetic field, such as Lorentz force, joule heating, and radiative cooling. Conversely, the generalized ohm’s law was used to solve the current density, which reflected the effects of flow field and temperature field on the electric field and magnetic field. In addition, the rest Maxwell’s equations and external solenoid magnetic field equation were also modeled. In order to know the effect of external magnetic field on the torch, the current intensity of external solenoid was chosen to simulate its influence on the flow and heat transfer in the torch. Results show that external magnetic field plays a part in stirring the plasma, which is advantageous for the preparation of diamond film. The larger the external solenoid current intensity is, the better the uniformity of the temperature and velocity of plasma is.
Design and Jet Characteristics Study of a Liqumatic Fire Water Monitor with Self-Swinging Device
Authors: Hu Guo Liang , Liang Ju Xing
Published: March 2010

Fire water monitor plays an important role in the fire fighting. A liqumatic fire water monitor with self-swing device was designed, the working principle and its components were also expounded in detail. The internal flow performance was simulated using fluent software, the influence rules on outlet velocity were analyzed by changing different angles of the monitor head and diameters of the monitor body. At the same time, the experimental tests were also carried out on the test rig. The simulation results accorded with the theory calculations in general. So, the rationality and accuracy of the designed fire water monitor was verified, and the relevant results can also provide a certain theoretical references for the design of other types of fire water monitor.