bluuebunny/crossref_metadata_2025 huggingface dataset:
Managing Change in Lean Manufacturing Implementation
Authors: Norani Nordin , Md Deros Baba , Abd Wahab Dzuraidah , Ab Rahman Mohd Nizam
Published: August 2011

Lean manufacturing is a proven approach for success in manufacturing industry. However, several organisations failed in their attempt to implement lean manufacturing system. The transition to lean manufacturing requires radical change which involves a total reshaping of purpose, system and culture of the organisation. This paper presents an investigation on the influence of organisational change to the transition of lean manufacturing. This study used an explanatory mixed method approach, which began with survey distribution, and then the general picture was further refined by conducting in-depth interviews on Malaysia automotive companies. The results revealed that company which emphasized on leadership and management, change agent system, effective communication, worker’s empowerment through training and team development, and also lean review system experienced smooth transition to lean manufacturing system. Failure to recognize the required organisational changes to adapt lean manufacturing system will hinder the long-term benefits of the organisation.
Research on the Weight Control Technique in the Manufacturing of Offshore Engineering Structure
Authors: Wang Ji , Liu Yu Jun , Li Yan Jun , Li Rui , Deng Yan Ping
Published: August 2011

The weight and gravity center control are very important in the manufacturing process of offshore engineering structure, which should be guaranteed to meet the designed requiements strictly. In this paper, the tolerance allocation algorithm and dynamic adjustment method for offshore engineering manufacturing are proposed based on the Dimensional Chain theory. Moreover, the control and management system is developed by analyzing the features of offshore engineering project management. By using of the system, digital and programmed control of weight and gravity center can be realized, and the manufacturing level of offshore engineering is enhanced.
Research on Power Line Carrier Communication Quality Evaluation
Authors: Yu Min , Xu Cheng Gang , Jin Xin Yu , Zhang Yu
Published: August 2011

Testing standards are not well defined for power line carrier (PLC) communication yet, and there are no professional, systematic and comprehensive detection indicators that can measure and evaluate the quality of PLC communication. This paper proposed a PLC communication quality evaluation model, T-S fuzzy neural network model based on LBG learning algorithm. Simulation results revealed that the proposed model could precisely reflect the quality of the PLC communication.
A Gravity-Like Mechanism for Car Sequencing Problem with Multistage Sequencing Buffer
Authors: Yu Dao Yuan , Zhang San Qiang , Shao Xin Yu , Liu Sheng Qiang , Tian Yu Hui
Published: August 2011

This paper proposes a new algorithm of gravity-like mechanism and a multistage buffer for the car sequencing problem. The algorithm utilizes the principle of gravity and codes the cars as particles, which can achieve the ordering by the gravity of particles themselves in the sequencing buffer. The Petri net model of the Buffer is proposed and a car sequencing problem is analyzed as an example, the results prove that the algorithm and the buffer can perform well in car sequencing problem.
A Framework for Correlation Relationship Mining of Cloud Service in Cloud Manufacturing System
Authors: Guo Hua , Zhang Lin , Tao Fei
Published: August 2011

As a new manufacturing paradigm, cloud manufacturing (CMfg) is proposed to realize the added-value and on-demand use of manufacturing resource and ability in the form of manufacturing services. Considering that there always exist correlations among cloud services (CS), which affect the cloud service composition (CSC). Hence, how to mine the correlations among CSs and apply them to CSC is a key issue for realizing the added-value. This paper presents a framework for correlation relationship mining for CSC. Four function modules for mining correlations among CSs are analyzed, and the involving key issues were preliminarily discussed as well.
Study on Balance Points of Bucket Brigade Lines with Return Velocities
Authors: Song Jing , Zhang Bi Xi , Guan Ying Ying
Published: August 2011

Because of the self-balancing and self-organizing properties of Bucket Brigades, it is well known by most scholars both at home and abroad. Ideally it is proved that higher productivity and production stability can be obtained through bucket brigade lines. However, return velocities must be considered in realistic conditions. We proved that bucket brigade lines with the same return velocities would be self-balanced, the task-delivering places approximates to the ideal balance point if the return velocity is large enough .At the same time the smaller return velocities will result in lower productivity.
Study on Nano-Scaled Precipitate in the Process of Cold-Rolled Production Based on CSP Technology
Authors: Sun Hao
Published: August 2011

An investigation has been carried out on the CSP low carbon steel after cold-rolling and annealing of the same thin slab was investigated by chemical phase analysis and SAXS method that as well as high resolution TEM analysis. It was found that the amount of nano-scaled MC particles is less than that of nano-scaled M3C particles by 160 times after the annealing, reduces is 26 times under two conditions, its grain-size distribution frequency highest is the 10~18nm size. But in the annealing process, the particles accumulated to grow up. Further analysis also indicated that particles distribution uniformity of cold-rolling is better than that of annealing condition. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.
The Application of 3D Design in the Design of Submarine Self-Propelled Model
Authors: Liu Rui Jie , Xiao Chang Run , Zhang Wen Zhao
Published: August 2011

The applications of the 3D design are researched in the design of submarine self-propelled model in the paper. By analyzing the experimental instances, the methods and ideas of 3D design are given in the design of the submarine self-propelled model. There is of great significance in improving the effect of mechanical design, enhancing design efficiency and shorten the cycle of designing and processing.
Shaking Moment Optimum Balancing of Planar Mechanisms
Authors: Bao Er , Ang Xue Ye , Liu De Yong
Published: August 2011

A new method of shaking moment balancing of force balanced linkages is presented in this paper. The shaking moment balancing is gained based on the angular momentum principle. The method of synthesizing a dyad to balance the shaking moments is given, two kinds of structure types are calculated, all the maximum absolute values of the shaking moments are decreased by more than 75 % and the f1uctuation values of those are reduced by more than 68 %.
Decomposition of T2 Signal for Multivariate Assembly Process Control Using Bayesian Network
Authors: Liu Yin Hua , Yang Yang
Published: August 2011

The process monitoring and diagnosis in assembly process is important. Multivariate T2 control charts are applied to detect the mean shift and interaction change in the assembly process. However, T2 charts can not identify the root cause of the change. The traditional MTY method for T2 signal decomposition is computationally expensive, especially when the dimension of the variables is high. A new approach based on Bayesian network to identify the significant cause of T2 signals is proposed in this paper. The headlamp bracket case is used to illustrate the overall procedure. And the effectiveness of the proposed approach is evaluated.
Effects of Hypophosphate Concentrations on the Characteristics of Micro-Arc Oxidation Coatings Formed on Biomedical NiTi Alloy
Authors: Xu Ji Lin , Luo Jun Ming , Liu Fu
Published: August 2011

Microarc oxidation coatings on biomedical NiTi alloy were prepared in aluminate electrolytes with and without hypophosphate addition. The effect of hypophosphate concentrations on the characteristics of micro-arc oxidation coatings has been studied. The compositions and surface morphologies of the coatings prepared in different hypophosphate concentrations were determined by energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Surface roughness (Ra) and bonding strength of the coatings were measured by surface roughmeter and a direct pull-off test, respectively. The corrosion resistance of the coatings was evaluated in Hank’s solution using potentiodynamic polarization tests. The results show that all of the coatings exhibit a typical porous surface structure and mainly consist of γ-Al2O3 crystal phase. With increasing the hypophosphate concentrations, the elemental contents of Ni, Ti and P increase while Al decreases; the pore sizes and surface roughness of the coatings decrease firstly, reaching a minimum value at 0.01mol/L, and then increase; at the same time, the bonding strength increases up to 60MPa, and then decreases. The corrosion resistance of the coatings decreases with the increase of the hypophosphate concentrations, but all of the coated samples is better than that of the uncoated NiTi alloy.
The Study on RFID Middleware for Real-Time Monitoring in Manufacturing
Authors: Fu Ying Bin , Jiang Ping Yu , Li Yong
Published: August 2011

Real-time monitoring is an important function for manufacturing execution systems (MES). In order to acquire the real-time data information, RFID technology is used to collect the data in shop-floor. This paper studies RFID middleware for the real-time monitoring in discrete manufacturing. Firstly, a process flow model is proposed. And the model of the process flow is converting into a manufacturing node flow. Secondly, RFID devices are configured for the manufacturing node. And a formalized description for RFID middleware mode is suggested. For the sake of resolving the model of RFID middleware, the data process policy is studied, and the real-time status of the monitored part is acquired. At last, a prototypical software system is developed to demonstrate above ideas.
On the Edge-Balance Index Sets of the Net Graph Cn2×P2n(n=0(mod2))
Authors: Zheng Yu Ge , Chang Yan Ming
Published: August 2011

In this paper, we mainly use the methods and techniques of graph theory and combinatorial mathematics to research the largest edge-balance index of the graph Cn2*P2n(n=0(mod2)), the edge-balance index sets of the graph are discussed, and finally getting the constructive proof about all the edge-balance index sets of Cn2*P2n(n=0(mod2))
Synthesis and Characterization of Silicone-Modified Butyl Acrylate-Methyl Methacrylate Copolymer Latex
Authors: Han Ye , Li Xin Wen , Liu Zhen Guo , Zhang Hui Xuan
Published: August 2011

Silicone-modified butyl acrylate-methyl methacrylate copolymer latex was prepared via semi-continuous emulsion polymerization. Octamethyl cyclotetrasiloxane (D4) was used to link acrylate and potassium persulfate was used as initiator (KPS). Effect of D4 content on polymerization of acrylate and properties of latex film were discussed in details. The results showed that the properties of acrylate could be improved by the introduction of D4. Dynamic mechanical analysis showed that the freeze resistance of copolymer was effectively improved. In addition, effect of D4 content on adhesive strength of copolymer was also investigated.
Experimental Study on Seepage Model of Rubber-Plastic Porous Tube
Authors: Chen Qi Dong , He Chun Yan , Meng Tao
Published: August 2011

This paper analyses seepage model of rubber-plastic porous tube by the Darcy law based on its material characteristics. Integrating seepage examinations the seepage law of porous tube was found ,providing theoretical basis for actual application of rubber-plastic porous tube in drip irrigation、aeration and so on .
Simulation Investigation the Effect of Heating-Lines on Tensile Mechanical Properties of Sheet Metal after Laser Scanning
Authors: Dan Wen Jiao , Zhang Wei Gang
Published: August 2011

In this study, tensional mechanical properties of sheet metal with heating-lines after laser scanning are investigated based on the thermal-microstructure-mechanical model. The phase transformations, during laser scanning of sheet metal, are calculated by coupling the thermal history from finite element analysis with a phase transformation kinetic model. The flow stresses of material are obtained from the constitutive relationship of the phases based on the mixture strain hardening laws. The results show that the influence of the heating-lines number on tensional mechanical properties of material is obvious. The mechanical properties are related to the distribution of microstructure in heat affected zone after laser scanning.
Experiment and Numerical Simulation of Extrudate Swell in the Polymer Extrusion Process
Authors: Zhang Min , Huang Chuan Zhen , Chen Guo Wen , Jia Yu Xi
Published: August 2011

The extrudate swell of the polymer extrusion process was studied with the experiment and simulation method. The extrudate swell process was recorded by the high-speed photography apparatus. The swell rate at the different time was calculated. It is found that the extrudate swell rate increase at the first five seconds. The maximum swell rate is about 4.37%. The three-dimensional numerical simulation model of the experiment die path was founded. The extrusion process including the extrudate swell was simulated used the Finite Element Method. Such simulated results as the velocity vector, the shear rate profile and the end of the swell zone were analyzed. The extrudate swell end got by the simulation is similar with the experiment result.
Numerical Simulation of Microstructure Evolution of TC6 Alloy Blade during Finish Forging
Authors: Qi G X , Mei Rui Bin , Wang F , Bao L
Published: August 2011

In order to predict the evolution of microstructure and grain size in TC6 alloy blade finish forging process and optimize the parameters, a series of constitutive equations for dynamic recrystallization and grain growth were developed and implemented into a 3D FE simulator. The grain size has been illustrated for the upsetting of TC6 alloy and the calculated grain size is in a good agreement with the experimental results, which shows that the microstructure prediction tool was validated and reliable. Then the distribution of stress, strain, temperature and microstructure, grain size and deformation has been predicted in TC6 alloy blade forging successfully using the 3D FEM at 930°C deformation temperature, 250°C die temperature and 50mm/s deformation velocity. The results show that the temperature of blade edge is higher than that of center because heat transfer, friction work and deformation work. The equivalent stress and strain have the same distribution as temperature after forging and the refined grain is obtained because of dynamic rescrystallization occurred with larger deformation. The uniform distribution of grain size are obtained in the blade and the shape after finish forging under the condition of technology parameters meet the user’s requirement comparing the calculated deformation with experimental results.
A Quantitative Shape Control Strategy for Hot Tandem Mill
Authors: Wang Dong Cheng , Liu Hong Min
Published: August 2011

For modern hot tandem mill, various shape control means are equipped, so its shape control ability is strong. How to reasonably distribute every stand’s shape control ability is a difficult problem. If the distribution scheme is unreasonable, every stand’s shape control ability maybe waste or offset each other, eventually product’s shape quality is inevitable unsatisfactory. To achieve high precision shape control, a reasonably shape control strategy is necessary, whose job is to make use of every stand’s utmost shape control ability, with a constraint that every stand’s flatness must not be buckling, finally ensuring product’s flatness and crown meet industrial demand simultaneously. A quantitative shape control strategy is put forward by this essay, which is verified on a 1750mm hot tandem mill, the result show its practicability to improve product’s shape quality.
Structural Design and Simulation of a Piezoelectric Peristaltic Pump Driven by Circumferential Traveling-Wave
Authors: Liang Li , Zhang Tie Min , Ma Xu , Wen Li Li
Published: August 2011

This paper proposes a new type of piezoelectric peristaltic pump driven by circumferential traveling-wave. The disk drive stator consists of an annular metal elastic base and a piezoelectric ceramic ring bonded to the metal elastic base with special welding adhesive. The vibration displacement function of composite vibrator was built. One end of the drive stator is divided into four sections. And it will generate mechanical deformation in circumferential direction to extrude the fluid in the tube when two-phase voltages with 90º difference and amplitude of 120V are added to each group consist of two relative sections and voltage of 0 is added to the other end of the drive stator. The actuation sequences can affect the flowing direction of the fluid. This pump has the advantages of simple structure, small size, light weight, low energy consumption and no electromagnetic interference. In this paper,the finite element model of the drive stator was also built by using ANSYS software, and relevant ANSYS harmonic response analysis was carried out. The results demonstrate that the positive and negative displacement of the maximal displacement node can satisfy the extrusion of silicon tube to the fluid and siphonage, and the corresponding resonance frequency can be operated. According to the simulation results the structure of the drive stator was determined.
Application of Collision and Interference Inspection Algorithm Based on Bounding Box in NC Machining Simulation
Authors: Li Jing , Jiao Yan , Li Bing Yi
Published: August 2011

Propose a collision and interference inspection algorithm based on bounding box, which can divide the collision and interference detection into rough, careful and precise inspection three steps. Rough inspection uses AABB bounding box, which can preclude the object that the interference wasn’t occurred obviously quickly and find out the potential intersectant object and area; careful inspection constructs the FDH bounding box to the object that has been confirmed interaction in the AABB bounding box; precise inspection detects and judges that the object occurs interference or not through the intersectant test of the triangular surfaces in the bounding box. This algorithm can simplify the calculating difficulty, improve the inspecting efficiency and meet the requirement to the inspecting speed and real-time in NC machining simulation.
Models and Implementation of Integrated Process Planning and Scheduling
Authors: Qiao Li Hong , Lv Sheng Ping
Published: August 2011

Integrated process planning and scheduling (IPPS) is a good way to achieve a global improvement for the performance of a manufacturing system, it has been extensively researched over the past years and it continues to attract the interest of both academic researchers and practitioners. This paper first summarizes the critical problems of IPPS and then a survey of the integrated model and optimal implementation method for IPPS is presented. The integrated model is categorized into interface-oriented integration and function-oriented integration two types based on the integration object and are discussed in detail respectively. The deficiencies of the current integrated models and the suggestion for further improvement are also given. The integration of process planning and scheduling has been implemented by variety methods and agent-based approach is discussed in more detail. Finally, future research directions and conclusions in IPPS research are discussed.
Finite Element Analysis on Structural Stress of 16×16 InSb IRFPA with Viscoelastic Underfill
Authors: Zhang Li Wen , Wang Jin Chan , Yu Qian , Meng Qing Duan
Published: August 2011

The thermal stress and strain, from the thermal mismatch of neighboring materials, are the major causes of fracture in InSb IRFPA. Basing on viscoelastic model describing underfill, the structural stress of 16×16 InSb IRFPA under thermal shock is studied with finite element method. Simulation results show that as the diameters of indium bump increase from 20μm to 36μm in step of 2μm, the maximum stress existing in InSb chip first increases slightly, and fluctuates near 28µm, then decreases gradually. Furthermore, the varied tendency seems to have nothing to do with indium bump standoff height, and with thicker indium bump height, the maximal Von Mises stress in InSb chip is smaller. All these mean that the thicker underfill is in favor of reducing the stress in InSb chip and improving the final yield.
Solutions for Deadlocked Problem of FMSs Using Theory of Regions
Authors: Pan Yen Liang , Huang Yi Sheng
Published: August 2011

Deadlock prevention problem is an important issue in essence for flexible manufacturing systems (FMS). Many works make efforts in the issue. Theory of regions is recognized as one of the powerful deadlock prevention method for obtaining maximally permissive controllers. All legal and live maximal behavior of Petri net models can be preserved by using marking/transition-separation instance (MTSI) or event-state-separation-problem (ESSP) methods. However, solving all sets of inequalities are an extremely time consuming problem since all MTSIs and ESSPs need to be considered in the reachability graph of a deadlock FMS. In our previous work, we propose crucial MTSI (CMTSI) method to improve computational difficulty successfully. In this work, we further enhance the computational efficiency of CMTSI by combining critical markings and CMTSI methods. Experimental results reveal that this approach is more practical than the conventional methods.
DOE-Based Numerical Investigation on Factors Affecting Temperature Field during Line Heating
Authors: Yao Zhi Hui , Gao Liang , Xiao Mi , Yang Lei
Published: August 2011

Line heating is a complex thermal-mechanical process as many factors affect the final shape of a processed plate. Generally, the temperature field of the processed plate determines the stress field and strain field. To predict the deformation of the processed plate, this paper investigates the effects of different factors on the temperature field during line heating by using design of experiment (DOE). Firstly, a three dimensional thermal elasto-plastic finite element method (FEM) is developed to calculate the temperature field induced by the single-pass oxygen-acetylene line heating. Secondly, the temperature field is analyzed by using fractional factorial design, in which the maximum temperature is selected as the response, and a fishbone diagram is used to overview all influencing factors. After performing a series of numerical experiments selected by using an ortho-gonal array, three main influencing factors are screened out: plate thickness, flow of acetylene and velocity of heat source. Next, the main effects of these factors are discussed. Finally, analytical re-sults indicate that there exist interaction effects among the three main influencing factors. This in-vestigation demonstrates that DOE is an efficient method for study of the temperature field during line heating.
Research on the Shrinkage Cavity Defect of the Extruded Boss in Fine Blanking Process
Authors: Lan Jian , Zhang Yong , Song Chang Peng , Hua Lin
Published: August 2011

The shrinkage cavity defect of the extruded boss is harmful to the quality of fine blanking workpiece and process. To suppress the shrinkage cavity defect, firstly, the boss extrusion is simulated to analyze main features of metal flow and the causes of the shrinkage cavity defects; secondly, some parameters affecting the material flow, such as the size of die and punch, blank holder force, friction coefficient, sheet thickness and counter force, are studied to figure out their influences on the depth of shrinkage cavities respectively; finally, the process parameters of a special workpiece are selected according to research results above, and experiment verified that the selected parameters can suppress the shrinkage cavity defect pertinently. In the paper, the shrinkage cavity defect is systematically studied for the first time, and this provides the base to design and optimize the extruded boss feature in fine blanking process.
Research Status of Warm Stamping Forming Technology at Domestic and International
Authors: Deng Ming , Wu Yu Qin , Lv Lin
Published: August 2011

This paper describes the research status of the warm stamping at home and abroad. The status of aluminum alloy and magnesium alloy is introduced in warm stamping respectively, using the tensile test, the drawing test, and bending experiments to prove the temperature and other factors have effect on the formability of materials. It also presents the status that using warm forming to solve the spring-back problem of the high strength steels. In addition, the mold and lubrication are also the key problems in warm stamping; they have a corresponding development with the development of warm forming though there are a few scholars specializing in the content.
Study on Microstructure Evolution of TA1 during Plane Compression and its Similarity to Power Spinning
Authors: Chen Yong , Xu Wen Chen , Shan Debin , Guo Bin
Published: August 2011

The hot power spinning process of TA1 has been studied on the base of isothermal plane compression model in this paper. The microstructures of spun workpieces and plane compression specimens are analyzed and the microstructure evolution mechanism has been investigated. The results reveal that the microstructure evolution has similar mechanism between power spinning and plane compression. Plane strain compression can be used to predict and control the microstructure of as-spun TA1 workpiece.
Constitutive Model of Supper-Alloy IN625 Based on Extrusion Test
Authors: Wang Zhong Tang , Zhang Shi Hong , Cheng Ming , Li De Fu
Published: August 2011

Abstract: It had been put forward that a new method to establish material constitutive model based on extrusion test, which was that the material constitutive model was determined with the Arrhenius equation according to the extrusion test data. The tube extruding test of supper-alloy Inconel625(IN625) had been done on 16300kN extrusion machine. According to the extrusion test data and the Arrhenius equation, it had been determined that the constitutive model of supper-alloy IN625 based on extrusion test, and the relative errors between calculation results of the model and experiment results are less than 7.8%. The suitable conditions of the constitutive model of supper-alloy IN625 are that the temperature being 1150°C～1200°C, and extrusion speed being 15～60mm/s, and strain-rate being 1.86～7.44.
The Durability Life Prediction of Recycled Concrete under Chlorate Environment
Authors: Chen Ai Jiu , Wang Jing , Ge Zhan Fang , Wu Ming
Published: August 2011

Using orthogonal test, the influence of variable mixing proportions of recycled coarse aggregate, polypropylene fibre and air entraining and water-reducing admixture on the anti-penetration capability of chloride ion of recycled concrete is analyzed. And the mechanism of resistance to chloride ion permeation concerning different mixing proportions of the materials is figured out. After that, basing on the effects of these materials on the durability life of recycled concrete in chlorate surroundings, the sequence is worked out: first, air entraining and water reducing agent, then recycled coarse aggregate, last one, polypropylene fibre. Employing Fick’s second law, the durability life of recycled concrete applied in chlorate environment is estimated. As a result, evidences for the practical application of recycled concrete are provided for its use in the northern cold areas and the places along the coast.
The Evaluation of Machinability of Inconel-718 and AISI4340
Authors: Chen Shao Hsien , Su Sen Chieh , Chang Po Chun , Chou Shuo Yan , Shieh Kong King
Published: August 2011

As prosperous in automobile and aerospace industries, the competition in machining industry is getting fierce. The requirements for product lie on not only the improvement of the quality, but also the processing speed. The Nickel based superalloy can maintain a very good strength under highly elevated temperature, so it is wildly applied to the components and parts which need to resist to high temperature, such as blades of aircraft turbine engines, rotors, turbine parts for nuclear power plants, heat exchangers, reciprocating engines, heat-treating equipments, liquid rockets, space vehicles and equipments for chemical and petro chemical industries. Nevertheless, Nickel based superalloy’s high strength, low thermal conductivity and working hardening will lead to a short cutting tool life and low efficiency in machining. At the same time, AISI4340 is also widely applied to processing parts for gears, piston, automobiles and machines.
Application of Taquchi Method in the Optimization of PTA Hardfacing Process
Authors: Chen Hung Shyong , Lee Jeng Nan , Kung Huang Kuang
Published: August 2011

The application of Taquchi method in the optimization of PTA hardfacing process for the wear-resistant plate has been studied in this paper. The operation current, powder feeding rate, torch moving rate and torch moving distance are the four factors evaluated in this research. Taguchi methodology is applied to make the association of these factors in optimization and through the observation of microstructure, hardness, wear-resistance and dilution rate to evaluate the effects of these factors on the hardfacing layer of the wear-resistant plate. By the microstructure observation, the more sturdy and compact of the Cr-C dendrite structure, the better the hardness and wear-resistance of the hardfacing layer is. The torch moving distance is the major factor of the surface hardness, and the torch moving rate for the wear, the working current for the dilution rate.
Dislocation Distribution Function of the Mode III Dynamic Crack Subjected to Moving Unit Step Load from a Point
Authors: Wang Yun Tao , Lü Nian Chun , Zheng Jin Kang , Cheng Jin
Published: August 2011

Dislocation distribution functions of the edges of mode III propagation crack subjected to Moving unit step load from a point was studied by the methods of the theory of complex variable functions.By the methods, the problems researched can be facilely transformed into Riemann-Hilbert problems and Keldysh-Sedov mixed boundary value problems. Analytical solutions of stresses, displacements, dynamic stress intensity factor and dislocation distribution function were obtained by the methods of the theory of self-similar functions.In terms of the relationship between dislocation distribution functions and displacements, analytical solutions of dislocation distribution functions were attained.
High Cycle Fatigue Behavior of MB8 Magnesium Alloy
Authors: Yang You , Wu Hua , Li Xue Song
Published: August 2011

High cycle fatigue behavior of MB8 magnesium alloy were investigated using an up-and-down load method. High cycle fatigue tests were carried out up to 107cycles at a stress ratio R=0.1 and frequency of 90Hz on specimens using a high frequency fatigue machine. Fatigue fracture surfaces of specimens that in the high cycle fatigue tests were also observed using a scanning electron microscope for revealing the micro-mechanisms of fatigue crack initiation and propagation. The results showed that fatigue limit of MB8 alloy at room temperature is 90.2 MPa under the numbers of cycle to failure Nf=107 conditions using up-and-down method calculation. The fatigue strength of the alloy is about 34% of its tensile strength. The micro-fatigue fracture surface of MB8 alloy included three representative regions. These regions are fatigue initiation area, fatigue crack propagation area and fatigue fracture area. Fatigue cracks of MB8 alloy initiate principally at surface and subsurface, and propagate along the grain boundary. The fatigue striations of fatigue crack propagation area are not clear. The fatigue fracture of test specimens show the rupture characteristics of dimple.
Study on Procedure of Bonding-FSSW Hybrid Joints of AZ31 Magnesium Alloy
Authors: Ding Cheng Gang , Ni Ya Qi , Guo Chuan Jun , Quan Gao Feng , Ge Ji Ping
Published: August 2011

In this paper a bonding-FSSW hybrid method is proposed and the joining procedure as well as the microstructure and performance of bonding-FSSW hybrid joints of AZ31 aluminum alloy is examined . The results show that the bonding agent has little influence on the forming and mechanical property of FSSW nugget, the shear-resisting property of the hybrid joints with sealing glue is equivalent to FSSW joints, in bonding-FSSW hybrid joint with high-strength bonding agent, the shear-resisting property of joints are apparently superior to that of pure FSSW or bonding joints. Tiny and uniform equiaxial grains are formed in the WN(Welding nugget zone) and coarse grains are formed in TMAZ (Thermomechanically affected zone) and HAZ (Heat affected zone), but with unequal size. The good properties of the hybrid joints are obtained by choosing the optimal joining parameter.
Based on WVD for the Processing State Identification Method of Machine Tool
Authors: Li Xi , Xia Tian , Feng Dan Feng
Published: August 2011

The processing state identification for CNC machine tool is not only key to achieve intelligent control, also is an important part for stability of real-time monitoring. This paper presents a basic model which used CNC machine tool spindle current signal mapping to the processing load signal, and then by the different load conditions cutting tests, compared with the Winger - Ville distribution(WVD) of those signals. Intuitive to find that time-frequency distribution compared with the traditional spectral analysis, not only is capable of with time-varying characteristics of the non-stationary signals, and more effectively reflect the state of machining process, and the instability of the processing status of the border with more strong discrimination capability.
Adapting AODV with High-Throughput for AMI Smart Meter Networks
Authors: Zhou Xiao Hui , Wang Fang Fang
Published: August 2011

All routing protocols are focused on how to transfer data more efficiently from the source to the destination. But various circumstances have diverse requirements, so the method adopts to achieve this is different. In this paper, we introduce the situation of AODV running in the AMI smart-meter reallity environment and point out the bottleneck of throughput as the networks grow larger. Then, “expected transmission count” metric is presented, which has been proven in other classic routing protocol for high-throughput improvement. After analysing the applicability of ETX metric with AODV, we describe the new AODV with four major changes listed as follow: router table, hello message, neighbor-node table and something related RREQ, RREP, RERR messages. Finally, we compare the results with the traditional AODV. Simulation results in NS-2 show AODV-ETX has better throughput than the traditional one.
Research on the Automatic Synchronization Control of Marine Power Station
Authors: Yu Feng Wei , Sun Hong Ying
Published: August 2011

Automatic synchronization is one of the important functions of marine power station management system. Grasping of ACB (air circuit breaker of generator) closing opportunity is the difficult and key point of automatic synchronization control. This paper offers a rapid and simple method of automatic synchronization control based on PLC and emphasizes on discussing a new method of grasping ACB closing opportunity in synchronization control. The system researched makes the best use of the computing function of PLC program and reduces the hardware as possible to improve the reliability and economical efficiency. Similar triangle principle and a new timing mode based on PLC scan cycle are adopted in grasping ACB closing opportunity. Several years of operation in training lab proved that the automatic synchronization system is reliable and steady.
Discussion on the Wavelet Adjustment Factor Threshold Noise Reduction Technology Based on DSP
Authors: Liu Zi Ran , He Tao , He Yuan Yuan , Yu Yu Xi
Published: August 2011

Because of discontinuity at threshold, hard threshold de-noising leads to the additional oscillation at threshold when reconstructing the signal, so that the smoothness of the de-noised signal becomes weak; Soft threshold de-noising method can guarantee the good continuity of the signal. However, for the existence of the fixed bias between the estimated threshold and actual threshold, there are also deviations between the reconstructed signal and the actual signal existing deviations too. In this work, by using the high performance DSP as a signal processing tool, we reduced the noise of actual measured vibration signal collected from headstock of CA6140 lathe. By comparing, the result is the same as the noise reduction simulation calculated from MATLAB, which demonstrates the noise reduction effect of wavelet adjustment factor threshold de-noising apparently.
Research on the Passive Detection Model Based on 3D-HBF and FSVDD for Underwater High-Speed Small Targets and its Application
Authors: Hu Qiao , Hao Bao An , Yi Hong , Yang Yun Chuan
Published: August 2011

Due to the high-speed, short-time countermeasure and small target strength of underwater high-speed small targets (UHSST), it is difficult to use a traditional method to accurately detect UHSST. So a novel passive detection model based on three-dimensional hyperbeam forming (3D-HBF) and fuzzy support vector data description (FSVDD) is proposed, where these advantages of beam width reduction and side lobe suppression for 3D-HBF and excellent target-detection capability for FSVDD are combined. The model consists of two stages. In the first stage, 3D-HBF is carried out to obtain the beam respond vectors (BSV) from original underwater acoustic signals. In the second stage, the BSV are input into the detector based on FSVDD to detect and locate the underwater targets intelligently. This model is applied to target detection of UHSST, and these testing results show that the proposed model has better detection performance than the conventional beam forming method, with a high detection success rate and localization capability.
Design of Front End Circuits in Cleaning Grain Loss Monitoring and Control System for Electric Combine Harvester
Authors: Liu Xiao Juan , Huang Xin Bing
Published: August 2011

This paper introduces the design of front circuit in cleaning grain loss monitoring and control system for a new electric combine harvester. This front circuit mainly includes signal conditioning circuits which are amplification circuit, anti-jamming circuit and filter circuit for transforming sensor output signal. 8031 single-chip is used as its core and implemented automatic monitoring of the cleaning grain loss. Owing to adopt the modular design method and mature technology, the circuit is powerful in function and easy to realize and has extensive value in use. The simulation results show that the effect is excellent and performance is stable.
Development of Measurement and Control System for TLP Bonding
Authors: Wang Hong , Yan Qian , Li Xin Geng , Wang Xue Gang , Wang Xiao Ming , Yan Feng Jie
Published: August 2011

The key to accomplish transient liquid phase bonding in the atmosphere is to control bonding temperature, holding time and compressive pressure. The measurement and control system was independently developed based on an industrial computer and I/O cards. The output of a medium frequency power supply and the opening degree of a proportional relief valve were regulated to control bonding temperature and compressive pressure. Improved PID algorithm was presented, and the temperature precision in steady stage reached ± 0.1%. The system is applied to TLP bond steel pipes successfully.
Study on the Frequency Characteristic of Self-Excited Oscillation Pulsed Water Jet
Authors: Tang Chuan Lin , Hu Dong , Zhang Feng Hua
Published: August 2011

The self-excited oscillation pulsed water jet (SEOP Jet ) has been used extensively in oil and gas well drilling, mineral mining, cutting and industrial cleaning. In order to improve the valid stand-off distance of water jet pressure and its range of action, the model of oscillation frequency of jet was given on the basis of hydroacoustics and fluid dynamics for better understanding the principle of increasing jet pressure amplitude. The SD150test system was used to analyze the effects of dynamic parameters on the frequency, the effects of pump pressure and the cavity length on the frequency were studied in detail. The test results showed that the peak value of the SEOP Jet is larger by about 20% than that of continuous jet. The oscillation frequency increased while increasing pump pressure and decreased while increasing cavity length. There was an optimum cavity length corresponding to the pressure peak value of the SEOP Jet. Experimental result is in good agreement with that of theoretical analysis.
The Flow Field Analysis of the Automotive Power Streering Congtrol Unit's Flow Channel
Authors: Cheng Kai , Yan Li , Li Guang Ming , Tang Jie
Published: August 2011

The automotive power steering units must be taken performance test after they are integrated assembly and then left the factory if it is qualified.Because its internal flow channel is very complicated and the residual hydraulic oil can not be eleminated clearly.So we can set up a 3D model flow channel based on CATIA and use FLUENT software to analysis the key flow channel ,analysing it's pressure distribution and velocity vector diagram then get the real reasonable resluts ,which can provide the basic for the ejector designing
Application of Inertial and Magnetic Sensors in Human Fall Detection
Authors: Liu Xiao Yan , Zhou Zhao Ying
Published: August 2011

Fall is a risky event in the elderly people’s daily life, it often cause serious injury both in physiology and psychology. An inertial and magnetic sensor based system is designed for fall detection in real time. This paper presents the design and test of this system. The system consists of three attitude measurement units fixed on the human legs and waist. Each unit contains orthogonally mounted triads of accelerometers, magnetometers and gyros. With an integrated microcontroller for attitude calculating and flash for data storage, the size of the unit is 32mm×23mm×12mm. An extended Kalman filter based on quaternions is designed for attitude measurement. The digital angle output rate is 100Hz. Human lower limb kinematic model is presented. The position of the gravity center is tracking by the inertial and magnetic sensing system.
Design of a Controlling System of Greenhouse Based on the Virtual Instrument Technology
Authors: Huang Xin Bing , Liu Xiao Juan , Hao Jian Bao
Published: August 2011

Combining with the development of greenhouse industry, this article puts forward a design scheme of a control system of greenhouse based on the virtual instruments technology. The data measured by the sensors are sent to the computer through the data collecting card. It uses the LABVIEW which is virtual instrument software for programming. Through the graphical operation interface and display interface, the data of temperature, humidity, illumination intensity and co2 concentration can be acquitted, transmitted, analyzed and displayed timely. And it realizes the virtual intelligent control of greenhouse environment.
Simulation for Temperature Control System of Dyeing Machine Based on Fuzzy Control
Authors: Zhao Min Ling , Li Guo Ping , Ze Xiong Bo , Ji Cheng Kai
Published: August 2011

In the process of dyeing, the temperature control of dyeing machine plays a decisive role on the stand or fall quality of fabric. The establishment of the traditional PID controller’s parameters needs a lot of test, which brings many inconvenience.Therefore, it is proposed to control dyeing machine temperature by fuzzy controller. Based on the principle of fuzzy logic control, the model of the temperature control system of dyeing machine is built. At the same time, through the fuzzy logic toolbox in matlab software, fuzzy controller of temperature is designed. Then a comparative simulation of the temperature control system of dyeing machine with matlab has been accomplished. Through the analysis of the results, it is concluded that the temperature system can achieve the higher steady precision.
Study on the Evaluation Model for Network Security
Authors: Li Jian Hong , Li Guang Zhen
Published: August 2011

This paper investigates the network security problem which is complex to evaluate. The key of this evaluation is to establish the factors and weights. Traditional methodologies cannot get rid of the key issues, resulting incorrect evaluation. In order to improve the accuracy, this paper proposes an evaluation model which is based on analytical hierarchy process (AHP) to evaluate the network security in the real-life background. There are several steps. First, evaluation factors are set up through Delphi method. Second, the weights are determined by AHP. Third, the evaluation is executed. Finally, the real-life cases are used to verify the model. The verification indicates that AHP enables to evaluate the network security efficiently in terms of objectiveness, high accuracy and comprehensiveness.
Simulation of Deep-Sea Extremophiles Sampling System and Experimental Study
Authors: Li Li , Li Hui , Zou Yan Hu , Shuang Zhi
Published: August 2011

The Deep-sea Extremophiles Sampling System, which contents plaited filter, is modeled and simulated in high pressure seawater environment by AMESim software. The dynamic performances of the system under different environment pressures are analyzed and some experiments are done to validate the simulation model. According to the simulation and experimental results, the environment pressure has very little influence on the pressure drop and flow characteristics of plaited filter. The plaited filter performs perfectly in high pressure seawater environment. The deep-sea extremophiles sampling system can meet the requirements.
Optimization of Advanced Cycle Gas Turbine Intercooler Structure Based on Genetic Algorithm
Authors: Wang Zhi Tao , Li Shu Ying , Luo Ping Ping
Published: August 2011

As an important component of intercooled cycle gas turbine, intercooler directly affects the ratio power, thermal efficiency and various situation quality of gas turbine system. In this paper, efficiency-heat transfer units were used for the design of intercooler, and the structure parameters were optimized by genetic algorithm. The optimization results show that under the condition of required heat load and allowable pressure drop, the heat exchanger can be guaranteed as the smaller weight and the larger heat transfer efficiency, which can offer reference for the design of the actual intercooler.
Non-Fragile Decentralized Control for the Uncertain Singular Large-Scale Systems with Time-Delay
Authors: Yang Dong Mei , Sun Qing
Published: August 2011

This paper is concerned with the non-fragile decentralized controller design problem for uncertain singular large-scale system with time-delay. Sufficient condition for the controller is expressed in terms of linear matrix inequalities(LMIs). When this condition is feasible, the desired controller can be obtained with additive gain perturbations and multiplicative gain perturbations. Finally, a numerical example is also given to illustrate the effectiveness.