bluuebunny/crossref_metadata_2025 huggingface dataset:
Nanostructured Surfaces that Show Antimicrobial, Anticorrosive, and Antibiofilm Properties
Authors: Reddy G.S. , Nadagouda Mallikarjuna N. , Sekhar Jainagesh A.
Published: August 2012

Provided in this article are the quantitative and qualitative morphological results describing the action of several nanostructured surfaces for bactericidal and bacteriostatic action. Results are also provided to illustrate microbial corrosion and its impact. Biofilm formation is correlated to colony formation. Nanostructured surfaces, i.e. surfaces with welded nanoparticles are noted to display biocidal activity with varying efficacies. Porous nanostructures, on stainless steel and copper substrates, made of high purity Ag, Ti, Al, Cu, MoSi2, and carbon nanotubes, are tested for their efficacy against bacterial colony formation for both gram-negative, and gram-positive bacteria. Silver and Molybdenum disilicide (MoSi2) nanostructures are found to be the most effective bactericidal agents with MoSi2 being particularly effective in both low and high humidity conditions. Bacteriostatic activity is also noted. The nanostructured surfaces are tested by controlled exposures to several microbial species including (Gram+ve) bacteria such as Bacillus Cereus and (Gram-ve) bacteria such as Enterobacter Aerogenes. The resistance to simultaneous exposure from diverse bacterial species including Arthrobacter Globiformis, Bacillus Megaterium, and Cupriavidus Necator is also studied. The nanostructured surfaces were found to eliminates or delay bacterial colony formation, even with short exposure times, and even after simulated surface abrasion. The virgin 316 stainless steel and copper substrates, i.e. without the nanostructure, always displayed rapid bacterial colony evolution indicating the lack of antimicrobial action. The efficacy of the nanostructured surface against colony formation (bacterial recovery) for E-Coli (two strains) and virus Phi 6 Bacteriophage with a host Pseudomonas Syringae was also studied. Preliminary results are presented that also show possible anti-fungal properties by the nanostructured MoSi2. When comparing antimicrobial efficacy of flat polished surfaces (no curvature or nanostructure) with nanostructure containing surfaces (high curvature) of the same chemistry, shows that bacterial action results from both the nanostructure size and chemistry.
Immobilization of Iron Nanoparticles on Multi Substrates and its Reduction Removal of Chromium (VI) from Waste Streams
Authors: Rahy Abdelaziz , Yang Kap Seung , Bunker Christopher , Nadagouda Mallikarjuna N. , Yang Duck J.
Published: August 2012

This article describes the in-situ synthesis and immobilization of iron nanoparticles on several substrates at room temperature using NaBH4 as a reducing agent and ascorbic acid as capping agent. The method is very effective in protecting iron nanoparticles from air oxidation for more than 30 days. Substrates used to immobilize iron nanoparticles are spherical polymer resins (size of 100–200 mesh) and novel carbon substrates prepared from high temperature carbonization of e-spun nylon and polyacrylonitrile fabrics. Iron nanoparticles (40–100nm) immobilized sample showed higher activity for the reductive removal of hazardous hexavalent Cr (VI) compared to free floating iron nanoparticles at ambient temperature. Iron immobilized substrates has a great potential to be used not only for the removal of Cr (VI) in waste stream but also for oxygen scavenger for food packaging.
Machinability of BMG
Authors: Bakkal Mustafa
Published: August 2012

This chapter covers the series of machinability evaluation test result and discussions of Zr52.5Ti5Cu17.9Ni14.6Al10 bulk metallic glass (BMG). These tests are lathe turning, drilling, milling and preliminary level grinding tests. In the continuous machining methods such as turning, drilling and grinding of BMG, above a threshold cutting speed, the low thermal conductivity of BMG leads to chip temperatures high enough to cause the chip oxidation and associated light emission. The high temperature produced by this exothermic chemical reaction causes crystallization within the chips. Chips morphology suggests that increasing amounts of viscous flow control the chip-removal process. Moreover, viscous flow and crystallization can occur during the machining of the bulk metallic glass, even under the high temperature gradient and strain rate. High cutting speed significantly reduced the forces for BMG machining due to thermal softening. However, in intermittent cutting process which is milling, there is no high temperature problem, special burr formations the rollover and the top burr were observed along the slot and achieved good surface roughness, Ra = 0.113 μm, using conventional WC-Co cutting tool. In each method, tests repeated for the conventional materials for comparison purpose. This study concludes the precision machining of BMG is possible with the selection of feasible tools and process parameters for each method.
Abrasive Wear Performance of Hot-Dipping Al-Mn Alloy Coatings on Q235
Authors: Dong Xiao Feng , Li Xin Mei
Published: August 2012

The Q235 steel was modified by hot-dip-aluminizing technique, and Al-Mn alloy layer was obtained on the steel surface. Scan electron microscopy (SEM), X-ray diffraction (XRD) and abrasive wear tester were used to investigate the microstructure and wear performance of the Al-Mn alloy coatings. The results show that the surface of the obtained pure aluminum coatings is acicular, while blocks Al-Mn compounds phase exists in Al-Mn alloys layer, and the Al-Mn alloy layer is composed of Al, FeAl3, Fe2Al5 and MnAl6 phases. The experimental results showed that wear weight loss of aluminum coating is more than Q235 steel. However, after manganese added to the aluminum, Al-Mn alloy coating abrasion wear loss of weight far below the Q235 steel and aluminum coating. And weight loss increases along with Mn content decreases. When worn after 100 h, Al-13% wtMn wear alloy coating weight loss of 45% of Q235 steel, aluminum coating of 35%. So the hot-dipping Al-Mn alloy layer has excellent abrasive wear resistance.
A Comparative Study on Modeling of High Temperature Rheological Behavior of AZ80 Magnesium Alloy Using Artificial Neural Network and Inverse Method
Authors: Lou Yan , Li Luo Xing
Published: August 2012

Artificial neural network (ANN) and inverse method were employed in modeling the rheological behavior of the AZ80 magnesium. The hot deformation behavior of extruded AZ80 magnesium was investigated by compression tests in the temperature 350-450 and strain rate range 0.01-50 s-1. Investigation of flow stress curves and microstructure of the compression specimen illustrate occurrence of dynamic recrystallization. The inverse method of non-liner regression was used to determine the parameters of the suggested constitutive equation. The maximum relative errors at different temperatures and different strain rates between experimental and predicted flow stresses by ANN and inverse method were compared. The results show the ANN derives statistical models have better similar prediction ability to those of inverse method, especially at high strain rate. This indicates that ANN can be used as an alternative modeling tool for high temperature rheological behavior studies.
Hybrid Intelligence Process Parameters Setting and Optimization on Differential Pressure Vacuum Casting
Authors: Lv Tian , Zhang Hai Guang , Liu Yuan Yuan , Hu Qing Xi
Published: August 2012

Considering that the problem of traditional process parameters setting in vacuum casting machine is of long period, high cost and inferior quality stability, a kind of hybrid intelligent decision model which combined with case-based reasoning, neural network and fuzzy reasoning were established. First, use the case-based reasoning technology to extract the similar case from the case database. Then, use the initial parameters to run the mould trial. Finally, use the fuzzy reasoning technology to optimize the initial parameters according to the product defects. Based on the above-mentioned intelligence model, the related hardware and software system was established. The actual practice proved that the system is effective and can be used in practical production.
Grinding Performance of Titanium Alloy Ti-6Al-4V with Monolayer Brazed CBN Slotted Wheels
Authors: Ding Wen Feng , Liu Zhi Wu , He Jian , Zhao Hai Yan , Wang Yan , Liang Yang Min
Published: August 2012

An experimental investigation was conducted on grinding Ti-6Al-4V alloy with monolayer brazed CBN slotted wheels for detecting the performance of the newly developed tools. The results showed that the effects of grinding parameters on the grinding forces and surface roughness with the brazed wheels were similar to that obtained with conventional electroplated ones to a certain extent. However, due to some distinguished features of the brazed CBN tools, i.e., high grain protrusion, optimum grain distribution and especially high joining strength, grain premature pullout behavior that had often occurred for electroplated tools was not observed during grinding, which had significant influence on the CBN wheels with merely singer-layer grains.
Research on Finite Element Simulation and Experiment of Temperature Field for Surface Cutting of Nanostructured WC/12Co Coatings
Authors: Deng Zhao Hui , Wu Qiao Ping , Wan Lin Lin , Pan Zhan , Zhang Gao Feng
Published: August 2012

To investigate the distribution of cutting temperature for surface cutting of nanastructured WC/12Co coating used the PDC cutter, according to machining properties of WC/12Co coating and working conditions, on the basis of the theory of thermal equilibrium of moving thermal source, the mathematical model of temperature field was established through reasonable hypothesis. Simulations were performed for the temperature distribution on the surface and inside the WC/12Co coating specimen using finite element method. And experiment of surface temperature of WC/12Co coating used the PDC cutter was carried out. The finite element simulation results were in good agreement with the experiment data, which verified the validation and capability of the finite element model.
Numerical Simulation of Temperature Field for Laser Clad Composite Coatings
Authors: Zhu Chen Guang , Sun Yao Ning , Sun Wen Lei , Zhang Xu Dong
Published: August 2012

A three dimensional quasi-state numerical model of fluid flow ,heat transfer process in the melted pool for composite coating was developed ,and the temperature profile were successfully calculated by finite element software. Numerical results show that when the laser power is 1.5KW, the coating melts and the matrix does not melt, forming good shape; when the laser power is 1.6KW, the thermal stress increase, the binding of substrate and coating occurs crack, the experiment is agreement with that calculated.
Study on the Multi-Axis Machining Technology of Helical Gear
Authors: Du Jia Xi , Shen Hong
Published: August 2012

In view of characteristics of involute helical gear profile, analyzed the multi-axis machining process for helical gear. Focused on the processing characteristics of helical gear for multi-axis machining, discussed tool path generation, machining program, tool path simulation, cutter interference and collision detection for machine tool and gear profile, seeking out the optimal method and process of helical gear for multi-axis machining. Applying this machining technology in manufacture, it can improve performance of gear, while it can also improve efficiency of manufacture.
Adhesion of Silicon to the Tool during Diamond Cutting Silicon by Molecular Dynamics
Authors: Wang Zhi Guo , Liang Yi Chun , Chen Jia Xuan
Published: August 2012

Wear of diamond tool is also very serious, which affects the surface quality of the machined work material, even if ductile mode where an undeformed chip thickness is at a nanoscale is used. During the cutting process, the crystal structure in the cutting zone is destroyed under the high pressures applied by the diamond tool. The silicon atoms adhering to the tool surface reconstruct to be in a crystal state under the effect of adhesion and pressures.
FEM Analysis of Temperature in High Speed Cutting of TiAl6V4 Alloys
Authors: Lin You Xi , Yan Cong Ming , Lin Zheng Ying
Published: August 2012

mprovements in modeling and simulation of metal cutting processes are required in advanced manufacturing technologies. A three dimensional fully thermal mechanical coupled finite element model had been applied to simulate and analyze the cutting temperature for high speed milling of TiAl6V4 titanium alloy. The temperature distribution induced in the tool and the workpiece was predicted. The effects of the milling speed and radial depth of cut on the maximum cutting temperature in the tool was investigated. The results show that only a rising of temperature in the lamella of the machined surface is influenced by the milling heat. The maximum temperature in the tool increases with increasing radial depth of cut and milling speed which value is 310°C at a speed of 60 m/min and increases to 740°C at 400m/min. The maximum temperature is only effective on a concentrated area at the cutting edge and the location of the maximum temperature moves away from the tool tip for higher radial depths of milling. The predicted temperature distribution during the cutting process is consistent with the experimental results given in the literature. The results obtained from this study provide a fundamental understanding the process mechanics of HSM of TiAl6V4 titanium alloys.
Preparation Technology and Surface Finishing Characteristics Research of New Magnetic Abrasive Tools
Authors: Li Xiu Hong , Li Wen Hui , Yang Sheng Qiang
Published: August 2012

According to the fact that the common machining medium used in magnetic abrasive finishing (magnetic abrasive) possessed disadvantages such as high preparation cost, easier to disperse in finishing process, and low utilization and repeat -utilization, this paper puts forward spherical magnetic abrasive of a certain size as magnetic abrasive machining medium, discusses the preparation techniques, establishes the mathematical model of finishing, and analyses the main performance parameter influencing finishing quality and finishing efficiency. Compared with magnetic grinding, spherical magnetic abrasive is not easy to disperse, can be re-used, having long service life and high finishing efficiency and quality. It is a magnetic finishing medium hasing development research value.
Experimental Investigation of Grinding Force in Microgrinding of Ceramic Materials Using Small Grinding Tool
Authors: Sun Ya Zhou , Liu Hai Tao , Zheng Qing Zhu
Published: August 2012

An experimental study of grinding force in microgrinding zirconia ceramics using small grinding tool is presented. In the experiments, the grinding tool used is electroplated diamond microgrinding wheels of 0.41, 0.63 and 0.76 μm in diameter, and the machining operations were conducted in side grinding under dry cutting. The process parameters include the diameter of the microgrinding wheel, feedrate, and rotational speed of the grinding spindle. The microgrinding forces were measured by a Kistler three-component dynamometer. The experimental results show that the normal forces are much larger than the tangential forces, the effects of process parameters selected on the variation of experimental results is almost the same for tangential forces, and that is the feedrate, diameter of the microgrinding wheel and rotational speed of the grinding spindle in turn for normal forces. As the feedrate increases or diameter of the wheel increases, the microgrinding forces increase, and the magnitudes of increase are more significant at higher radial grinding depth.
Finite Element Simulation and Experimental Research on Micro-Milling Process of Titanium Alloy
Authors: Liu Hai Tao , Sun Ya Zhou , Shan De Bin , Geng Yan Quan
Published: August 2012

There are lots of titanium alloy parts which have large-scale micro-structures in astronautic structure and medical implants, so the micro milling becomes one of the effective processing methods in getting the surface micro-structure. Because the titanium alloy has high caking property in processing, it needs a research on the cutting heat and force in order to get better machining precision and surface quality. According to the finite element theory in elastic and plasticity, the influence of cutting speed to the cutting heat and force is got by finite element simulation analysis to the titanium material TC4 in cutting process. It can get the simulation results of cutting heat and force in the micro milling processing by finite element analysis, and then compared, the basic influence which the cutting speed to the cutting heat and force is got. The correctness of the result is checked through cutting experiments.
Equipment Development of Crankshaft Barrel Finishing on Integrated Design Theory
Authors: Li Wen Hui , Yang Sheng Qiang , Li Xiu Hong
Published: August 2012

ntegrated design theory and method oriented to the product generalized quality is one design method facing to the full-function and whole performance. Design theory of barrel finishing equipment is put forward by the design of crankshaft barrel finishing equipment, function optimization and visual optimization design are mainly discussed, which can provide the design thought for developing new barrel finishing equipment.
Influence of Roller on Tooth Height of Internal Spline Formed by Spin-Forming
Authors: Sun Ling Yan , Xia Qin Xiang , Cheng Xiu Quan , Ye Bang Yan
Published: August 2012

Spin-forming of part with internal tooth is a new technology of the near-net forming in gear manufacturing field. And the main purpose of the parts spin-forming is to shape teeth on the internal surface of blank. In order to improve the forming quality of internal tooth, the effect of roller on tooth height of spline was investigated by processing experiments and finite element simulation. The result indicates that, for full-radius roller, a large nose radius has also witnessed a discernible growth in spinning force and tooth height; considering the uniformity of tooth height distribution of spun part and decrease in forming force, the bio-conical roller is more suitable for this forming process
Analysis of Static and Dynamic Stiffness for Coupled Double-Rotor Spindle System of High Speed Grinder
Authors: Hou Ya Li , Mao Wei Ping
Published: August 2012

This study was focused on the theoretical modeling and numerical investigation about the dynamic and static stiffness of coupled double-rotor spindle system of high speed grinder. The moment balance and the transition matrix, the state vector, field matrix of spindle system of high speed grinder were analyzed and deduced. The theoretical models about dynamic and static stiffness were established using the transfer matrix method. The numerical results showed that increased rigidity of front bearing significantly increased static and dynamic rigidity of spindle end and the rigidity of front bearing increased, dynamic rigidity increased more significantly than static rigidity. Furthermore, it can be conclued that increased overhang length reduced dynamic and static rigidity of spindle end at an increasingly slower rate and the span of bearing increased, static and dynamic rigidities of spindle end were reduced
Development of a New Pressing Machine for Assembling Armature Components of Electro-Hydraulic Servo Valve
Authors: Shao Dong Xiang , Li Bin , Wang Guang Lin , Wang Hui Feng , Zhang Zhen Long
Published: August 2012

Armature components are the core component of the electro-hydraulic servo valve, and all the components of the armature components require high precision and assembly accuracy. Now, the armature components assembly uses an old-fashioned pressing machine, whose success rate and efficiency are low. This situation wastes a great deal of economic costs and time costs. To improve this situation, the authors develop a new type of automatic assembling machine to achieve automatic and high-precision assembly of the armature component.
A New-Structured Tower Crane
Authors: Wang Ji Yong , Jin Tong Hong , Cheng Lu Bo
Published: August 2012

Advantages and disadvantages of present tower crane's upper structures are analyzed in this paper. According to the theory of prestressing jib, through combination design, a kind of structure is presented which can realize multiple use and greatly improve the hoisting capacity. Mechanical analysis and contrasts are done for old and new designs by finite element analysis software ALGOR. Finally, an example is given to verify the validity and feasibility of the design
Moving Load Simulation Method of the Evolute Cylinder Gears
Authors: Li Yue Feng , Pan Xu Dong , Wang Guang Lin
Published: August 2012

The curve intensity of deddendum plays a significant role in gear strength design. Due to the complicated shape of gears, traditional method utilizes the cantilever beam model adds the concentrated load at a fixed point and then revises it by coordinating with different factors so as to calculate the gears the curve intensity of deddendum. In this paper, based on evolute formulas, a methodology about finite element analysis was used for establishing the accurate tooth profile model of the evolute cylinder gear. The moving load was added by programming and the regularity that the amplitude of load changes with the position of the point of application in a tooth meshing cycle was determined. Based on proposed model, this paper provides the variation regularity of the magnitude of the stress of deddendum by simulation.
A Method for Knowledge Reasoning of Mechanical Product Intelligent Design Using Information Entropy
Authors: Li Jing , Zou Xiang Jun , Wang Hong Jun , Chen Yan
Published: August 2012

Because of the universality, complexity and uncertainty of mechanical design knowledge, knowledge reasoning and integration of intelligent design system was one of the difficult problems. The valuation of weight by human was used in many methods for knowledge reasoning at present. In order to make the intelligent product design become more scientific and rational, and eliminate the subjective human factors, a method for reasoning using information entropy was proposed. First, by means of the advantage of the relational database include the redundancy, consistency and integrity, the mechanical product design knowledge base was established. Second, based on the information entropy theory, the weight of each attribute was calculated directly through the objective information. Third, based on the objective data in the original sample, the method for calculating the similarity between accurate attributes and uncertainty attributes and design schemes was given. Finally, this method was verified by fruit picking robot intelligent design system, and the result showed that it is objective and effective.
Research on Collaborative Design and Manufacturing for Civil Aircraft
Authors: Wang Chen , Cai Hong Xia , Ding Kang , Yu Tao
Published: August 2012

The collaborative design and manufacturing is applied in the aircraft industry. This paper introduces the collaborative design and manufacturing mode in aircraft industry and presents its structural framework. The data is managed in the structure of BOM and there are two ways to share the data between the suppliers. The collaborative design and manufacturing process reflects the concept of concurrent engineering. The collaborative design and manufacturing system has been applied in the project of C919 which could sharply shorten the research cycle and reduce the product cost.
1.5MW Wind Turbine Structural Dynamic Analysis
Authors: Gong Jie Kai , Sun Wen Lei , Wu An
Published: August 2012

In recent decades, the rapidly development of wind energy in China and the increasing of size and complexity of wind turbine have requested the improvement in wind turbine systematic design technology. A reasonable systematic dynamic model is an important part for systematic design of MW-class wind turbine. In structural dynamic model, the flexibility of blade and tower is represented by presumed mode shapes. In this paper, based on presumed mode shape method, the structural dynamic equations of wind turbine were constructed. Along with the wind field model, the wind turbine aeroelastic systematic dynamic model was constructed. Using the model, the deflections and load of blade, low speed shaft torque of a 1.5MW wind turbine have been calculated. Therefore, the construction of wind turbines systematic dynamic model has an important significance for the development of wind systematic design and manufacturing capacity.
Transverse Oscillation of Precise Cable Drive System
Authors: Lu Ya Fei , Hei Mo , Zhang Zhi Yong , Fan Da Peng
Published: August 2012

Precise cable drive has been developed as an alternative transmission element to gearbox, belt and pulleys, chains and sprocket in Electro-Optical Tracking system. Precise cable drive has several significant advantages including backlash free, high stiffness, high efficiency, no lubrication etc. This paper develops analytical methods to predict the transverse oscillation frequency of precise cable drive to enable designers to better assess dynamic performance in the design study phase. Theoretical formulation of transverse oscillation equation for precise cable drive is carried out based on Hamiltons principle taking into account flexural rigidity of cable. Furthermore, the transverse oscillation frequency is obtained from the transverse oscillation equation assuming small and linear vibration. Parametric studies are conducted to evaluate the relationship between the oscillation properties and cable drive parameters.
The Error Analysis about Gauge Visual Detection System between High Signals and Contact Net
Authors: Zhu Xi Lin , Yu Yong , Wei Qiang , Zou Xiang , Huang Chen Jun
Published: August 2012

t is need to experiment to verify the correctness and validity of various stages in system design after gauge visual detection system designing between high signals and contact net. Then it does error analysis from lighting conditions, camera resolution, binocular imaging system installation structure, camera out of synchronized, noise and subsequent image processing operations, etc. It analysis the systematic errors principle and specific impact, then identifies specific improvements.
The Study on Blade Pitch Control of Wind Power with Gain Scheduling
Authors: Hai Ji Zhe , Sun Wen Lei , Hu Guo Yu , Wu An
Published: August 2012

In this paper, we demonstrate the design and simulation of a baseline PID rotor collective pitch controller with a gain scheduling for WindPACT) operation. We use a FAST-Simulink model of the closed-loop system to describe simulating this controller.Through the simulation analysis and comparing the result, control effect with the control strategy of gain scheduling results in better power regulation. At the moment of wind speed make more close to the rated wind speed, the changes of pitch angle is more sensitive, and the output power is larger and more smoothly.
Development of the Control Section for a New Armature Components Assembly Machine and its Application Test
Authors: Li Bin , Shao Dong Xiang , Wang Guang Lin , Wang Hui Feng
Published: August 2012

The armature components are the core component of the electro-hydraulic servo valve [. Its manufacturing and assembly accuracy directly affects the performance of the servo valve. The domestic existing electro-hydraulic servo valve armature assembly pressure equipment is so far behind that it is difficult to meet production requirements. For the needs of a servo valve production firm, authors department developed the armature components automatically press machine. In order to achieve automation and intelligent of press process, this article supports a electronic control system for the press machine to further improve its ability. And on the basis of certain experiments, the author proves the good performance of the pressure machine.
Locating Error Analysis of Dimension and Symmetry of the Keyseat on Shaft and Jig Design with Precision
Authors: Yuan Kai Feng
Published: August 2012

Keyseat on the shaft is an important geometry and is increasingly required for the dimension and symmetry with strict tolerance. However, the routine milling operation for the keyseat is done with the shaft located on V block, with relatively low accuracy. In the current study, based on analysis of the influencing factors of the locating errors for three types of design, a special jig is designed that mey supply high locating accuracy with ease in operation. The jig is composed of the base, assembly of position parts, supporting plate and V block, linkage-clamping mechanism. Positioning errors and clamping force are insighted. Thus, theoretically-zero-locating error jig is created with efficiency and ease in operation.
Simulation Study on Dynamic Characteristics of Electrical Control Type Water Distributor Based on ADAMS
Authors: Guo Shu Jun , Fan Jun , Dong Ping , Xu De Fu
Published: August 2012

There is a difficult technology problem of high-pressure differential multi-layer separate injection, which had given birth to after using the technology of water injection in the process of oil extraction, the electrical control type water distributor has been designed for the solving of this difficult technology problem. The dynamic characteristics for the executive body of electrical control water type distributor had been studied based on the technology of virtual prototyping and the theories of multi-rigid-body kinematics and modal analysis. The three-dimensional model and dynamics model had been established firstly using UG software, then the kinematics analysis and modal analysis of its key components had been simulated using ADAMS software, its kinematics discipline and natural frequencies and vibration modes have been simulated at last. Therefore, the simulation results provide theory data for its structural optimization design.
Analysis of the Pressure and Carrying Capacity of the Friction Pair Fluid-Film for the High Parameter Bellows Mechanical Seal
Authors: Gao Qiang , Ahmat Mutellip , Ren Li Chao , Luo Jing
Published: August 2012

In this research, by based on the computational fluid dynamics (CFD) numerical theory, using the Standard-Turbulence model and the Standard-Wall function, the fluid-film between the clearance of the sealing ring friction pair for the bellows mechanical seal under such the high-temperature, high-pressure, high-speed as complex working conditions was numerically simulated, the pressure fluid and the relationship of the carrying-capacity of the fluid-film between the pressure inlet of seal cavity and the width of the fluid-film, and the results of the numerical analysis was compared with the theoretical value. The researching results provide the scientific basis for the optimization designing of the high parameter bellows mechanical seals.
Effect of Extreme Temperature on the Performance of Wind Turbine Blade
Authors: Yang Jia , Qi Wen Jun
Published: August 2012

According to the Dabancheng wing farm weather conditions from 1971 to 2000, and its extreme temperature conditions, the performance change of 750KW wind turbine blade with them was researched in the article. Import UG Modeling to ANSYS, then achieve the static structural analysis and the heat-structure interaction analysis respectively. The results show that comparing aerodynamic-temperature loads with aerodynamic loads, the stress, strain and displacement of the blade is increased by 13.89%, 10.29% and 0.20%. Therefore, temperature changes have a certain impact on the blade performance. In the future, the temperature will be a necessary consideration during design of blade structure.
Research on RecurDyn Based Simulation Method for the Brake Shoe Eccentric Wear in Railway Freight Cars
Authors: Lu Bi Hong , Zhang Yu , Qu Bao Zhang , Huang Jian Song , Liu Yu
Published: August 2012

The foundation brake rigging is an important part of the railway freight cars, as it is an actuator of the rolling stock for deceleration and stop to ensure essential device for running safety. The mechanism clearance of the foundation brake rigging has a great influence on the brake shoe eccentric wear in the braking and releasing process. Especially during the braking process, the contact area between the brake shoe and the wheel tread is very small, resulting in the contact area with high stress. Actual operation manifests that on the upper side of the brake shoe wear severely. In order to build and analyze the model of the mechanism with clearance, the foundation brake rigging for the rigid-flexible coupling and multi-body dynamics simulation is carried out with the RecurDyn software, which provides the flexible body analysis module-FFlex. The method of resolving the problem is proposed, which includes the original model format conversion, the model preprocessing, constructing the rigid-flexible coupling dynamics model and analyzing the simulation results, and then providing the theoretical and technical support to improve the foundation brake system for railway freight cars by analyzing the main factors of influencing brake shoe eccentric wear.
Analysis and Study on Surface Quality of Workpiece of Short Electric Arc Machining Process
Authors: Zhou Jian Ping , Xu Yan , Zhang Jun Ze , Ma Bo
Published: August 2012

Owing to the Poor Surface Quality of Workpiece Processed by SEAM, the Work Used the Design Method of Orthogonal Experiment to Search for the Rules between Process Factors and Surface Quality of Machining. through the Range Analysis of Test Results and the Establishment of Process Regression Equation to Find the Rules between the Surface Quality of Workpiece and Process Factors, the Paper Provided the Test and Theoretical Basis to Achieve the Purpose of Improving the Surface Quality of Workpiece of Short Electric Arc Machining Process.
Optimal Design of Automobile Connecting Rod Basic on Finite Element
Authors: Yang Zhi Bo , Luo Peng Fei
Published: August 2012

The performances of automobiles rely on the engine in high extent, plus connecting rods are the main part of the engine, whose work environment is poorer and pressure is complex. In order to decrease the inertial force and add the span life of the engine, the weight of connecting rods is as litter as possible. Conventional design method is mainly dependent on experience. By means of soft ware of ANSYS, connecting rods are optimized when the structure of connecting rod is simplified, such as big end hole being a whole and taking no account of the interaction between bearing and bush. 45steel is chosen as a material and it must meet tensile strength, lower yield strength, impact toughness, and so on. The new connecting rod can save the material, compared with the conventional connecting rods.
Design for a Novel Mobile Portable Wardrobe
Authors: Tang Jia Wei , Cao Jian Bo , Li Xi Lin , Wu Jiao , Jin Xue
Published: August 2012

For saving the unavailable space in high place of residence reasonably, a new type of mobile portable wardrobe was designed. The whole height of this wardrobe was raised, and its upper cabinet is relatively movable. The improvement made the wardrobe more convenient, efficient and secure for users to obtain or clear up items.
Optimization Design for Automotive Interior Trimmings Based on Moldflow
Authors: Lin Zheng Ying , Hou Wan Li
Published: August 2012

Took the auxiliary fascia console lid of automotive interior trimmings for example, the preliminary plastic was designed by Pro/Engineer, then the Moldflow analysis on the plastic was performed. Those irrational factors of both injection technical parameters and structure of the plastic, which would occur in the injection molding process, were modified after analyzing simulation results. The rational plastic was obtained by repeating simulation and optimization, which indicated that the simulation-based optimization could improve the plastic quality and efficiency of injection molding. Meanwhile, the comparisons of mode locking force and molding time between microcellular foam and non-foam injection molding were also carried out, which showed the significance of numerical value simulation in injection molding processes.
Research and Simulation of LTE Technology in Manufacturing Metal Part
Authors: Fan Hui , Huang Yin Hui
Published: August 2012

Laminated templates electro-deposition (LTE) is a new manufacturing technique aimed at a highly precise and low-cost fabrication of metallic structures through a number of planar template-patterned depositing. The ability to control deposit surface non-uniformity in each planar depositing has been proved a key to this technique. Correspondingly a 3D simulation for electrical field has been modeled using finite-element method in line with the real experimental conditions. The mapped contour of simulating proved the variedly distributed electrical field and basically match with experimental results. Three groups of LTE test by direct current, pulse and double-pulse current are introduced and assessed in term of their effect to improve uniformity. By comparison, pulse application, especially double-pulse offered a better deposit quality with optimized parameters including pulse width, frequency, working time and off time. A bulk of 10-15layers copper parts, section size 20mm×20mm and 4-6mm thick were produced using the modified parameters.
Modal Analysis of the Gantry Crane Based on System
Authors: Si Yao Hua , Cheng Xue Li , An Lin Chao
Published: August 2012

Modal of the gantry crane is developed by system point of view, Simulation model of the gantry crane system based on ANSYS is established, and each mode of the systems natural frequency and vibration mode were obtained. The dynamic characteristics of the system is evaluated, provide an important modal parameters for Gantry crane system architecture to optimize the design and stability analysis.
Reliability Analysis and Engineering Application on Chemical Process Equipment System
Authors: Zhang Ya Xin , Pan Hai Li , Yang Tao
Published: August 2012

Reliability and availability are important symbols which weigh the reliability of product. Chemical production equipment system is consisted of many single devices. Due to special dangerous, the reliability analysis to whole equipment system is very important to keeping the safety of production process. In this article, to chemical process equipment system, the reliability calculation method, basic principles, basic assumptions and calculation program are described. To a aromatic semi-renewable dehydration process system, by using the reliability calculated method above, the fault tree and reliability block diagram are derived, the system reliability and availability are accounted, the corresponding reliability and availability curves are obtained and the main factors influencing the reliability of the system are analyzed.
The Simulation about the Reliability and Fatigue Analysis of Tower at Connecting Region of Cylinder and Skirt
Authors: Zhang Ya Xin , Gao Qi , Ma Yin Chang , Zhang Xin Jian , Zhao Ting
Published: August 2012

The reliability and fatigue analysis of tower at the connecting region of cylinder and skirt are very significance to tower safety. Because of large size, the common way by experimental analysis is almost impossible to achieve. In this article, to the distillation tower using in some petro-chemical company of Xinjiang, the stress and strain analysis, reliability and fatigue analysis at the connecting region of cylinder and skirt are performed by FEM. Based on the conclusions above, the main parameters which affect reliability are determined and some suggestions about structure optimization are proposed.
Structure Design of a Manual Moving and Lifting Worktable
Authors: Ouyang Xiang Bo , Li Ke Tian , Chen Xin Du , Wen Yao Long , Lin Pu Jin
Published: August 2012

This paper presents a manual moving and lifting worktable. This worktable consists of roof, base,cross frame, wheels, lifting device, wire driving two-way ratchet and parallelogram steering structure. It can do some action such as moving, turning and lifting through the manual operation for the application of warehouse, logistics, and indoor maintenance. The paper analyses the principle and structure of the worktable, especially on the design and work principle of two-way ratchet. The design is satisfied by built a real model.
Development of a New Type of Hydraulic Drilling Car Used in Coal Mine
Authors: Zhang Ming Zhu , Dai Yong , Guo Bo
Published: August 2012

Coal gas accident is the main threat to the safety production in coal mine,it needs a safe and efficient drilling equipment to detection and drainage in the gas area.At present,the equipments detect and drainage in underground coal mines are mainly fission rigs,which move time-consuming, and the efficiency of drilling is low.This paper introduces a new kind of full hydraulic drill car used in coal,it includes the integral design of the car, the structure layout, the drilling arm and the main parts of design ideas.The new drill carriage adopts the caterpillar vehicle structures,full hydraulic pressure drives,it can automatically change the drill rod, prevent bit-stuck device,can freely passage in the narrow roadway,arrived at the reservation of the drilling position and carries on the omni-directional drilling,it can meets various mine construction requirements, and it has a broad market prospect.
Reliability Analysis and Goodness-of-Fit Test of Pen Cylinder
Authors: Jiang Dan , Wang Cong Ling , Yang Ping
Published: August 2012

According to the durability test results of pen cylinders, including failure modes and fatigue life data, life distribution of pen cylinder is studied. The parameters of Weibull distribution of pen cylinder are estimated by least square method. Using Weibull distribution test, the goodness-of-fit test of the pen cylinder life distribution is carried out. Results of goodness-of-fit test show fatigue life distribution of pen cylinder complies with Weibull distribution with two parameters.
Study on Noise in New Roller Chain Drives
Authors: Sun Wei , Liu Xiao Lun , Wang Wen Cheng , He Li Yan , Liu Jia Jun
Published: August 2012

In order to mitigate the impact and the polygon effect of the chain and the sprocket during the meshing process and achieve the purpose of noise reduction, a Hlow noiseH nanostructured metal mesh-polyurethane composite material split roller chain was designed by means of changing structure and material of chain roller. Noise testing and frequency spectrum analysis were conducted, for the new roller chain and the other three kinds of the same specification chains with different structural rollers, on the closed force flow noise test bench researched and developed independently. The results show that the new roller chain can absorb some of the impact energy, and reduce vibration and noise of chain drive. The noise level generated by the new roller chain is significantly lower than the other tested roller chains, especially in high frequency and high speed. The difference in noise level is actually 3-11dB in driving sprocket speed of 1000r/min, and a significant noise reduction is achieved. The results also verify low noise characteristics of the new roller chain and rationality of design method.
Kinetic Analysis on the Level Spindle-Type Cotton Pickers Abstract Drive Spindle Seat
Authors: Si Xue Fu , Sun Wen Lei
Published: August 2012

The cotton picker's work environment is relatively poor, abstract friction between the spindles and the cotton fibers in the cotton picker process make the spindles serious damage. Often appear the failure modes of wear and fracture. This article uses ADAMS to analyze a pair of bevel gears which are parts of abstract drive spindle seat, according to the torque and contact force selecting the appropriate spindles material.
The On-Line Calibration Research of the Picking Robot Binocular Vision System
Authors: Chen Ke Yin , Zou Xiang Jun , Chen Li Juan
Published: August 2012

In the picking robot binocular vision systems research, the camera calibration is often an indispensable step and these basements to locate the target of the object and rebuild the three-dimensional construction based on the robot stereo vision for the follow-up study. So, searching for a high accuracy and simple camera calibration algorithm is of great significance and necessary. However, For most of these camera calibration algorithms, it is necessary to establish a reference object, namely the target, in front of the camera at present, but posing the target is very not convenient or almost impossible in some cases. Therefore, a picking robot online calibration algorithm based on the vision scene was proposed by studying the work environment characteristics of the picking robot binocular vision system and the invariant projective geometry. The experimental results showed that this algorithm’s calibration accuracy and precision good meets to the requirement of the robot binocular vision system camera calibration in the complex environment.
Application of the Two-Dimensional Movement and One-Dimensional Rotation 3 DOF Robot on Riveting System
Authors: Wang Xiao Lin , Wang Xiao Shi , Wei Ai Xiang , Li Ke Tian
Published: August 2012

This paper presents a two-dimensional movement and the one-dimensional rotating 3 DOF robot that can be used to pick up, delivery and place riveting column, thin axis (referred to as riveting column) and other parts, forming the assembly systems of riveting of sheet metal. In addition to the robot, the system also has moving table, clamp, a number of riveting column station and spin riveter etc. Moving table is equipped with the clamp, it can move in the X and Y directions, respectively. The clamp that fixed the sheet metal work-piece can move in Z-direction, which make it easy for assembling the riveting axis into the riveting holes on the work-piece. Robot can move along the Y axis and swing around the Z axis, make the nozzle that is in the end of manipulator move between riveting column stations and spin riveter, which pick up and place the riveting column. A number of riveting column station is used for store riveting column and sorting them. Spin riveter rotates while moving along the Z axis at the same time, by pressure and rotational force it completes the column riveting on sheet metal parts.
A Dichotomy Searching Algorithm for Planar Straightness Error
Authors: Lei Xian Qing , Zhou Jia , Tu Xian Ping , Xue Yu Jun , Ma Wei
Published: August 2012

The evaluation algorithm of planar straightness error is discussed. A new kind of method that named as Dichotomy Searching Algorithm (DSA) is presented to implement the minimum zone tolerance for evaluating planar straightness errors. The algorithm meets the principle of the minimum zone tolerance. The principle of the algorithm is that two special provision points are constructed based on the starting endpoint and end endpoint respectively firstly, then the four presume centerlines can be established by connecting the preset two special provision points of the starting endpoint to the preset two special provision points of the end endpoint in turn, after that, calculate the distances between all the measured points and the supposed centerlines. The minimum zone straightness error is obtained by means of compare, judgment and set the new special provision points repeatedly. This algorithm is substantiated with typical examples and the results show that the algorithm can be used to achieve precise computation of planar straightness errors.
Moment Resisting Performance Analysis and Structure Optimization for Electric Actuator
Authors: Wu Gui Cheng , Liu Yu Hui , Yang Deng Liang , Deng Jian Hui
Published: August 2012

The development of altitude and remote control for aircraft requires larger rudder piece pitch angle, and Electric actuator needs to withstand larger bending moment as the attitude control executive mechanism. Traditional bending moment and torsional moment of Electric actuator rely on output shaft bearing which are difficult to meet the requirement of resisting large moment. Based on a particular type of Electric actuator system, this paper analyzes its moment resisting capacity, proposes an idea of seperating bearing objects of bending and torsional moment for aircraft, and designs an innovative actuator structure. Moment test experiments show that moment resisting capacity of the new Electric actuator is enhanced to 150% more than orginal one.