bluuebunny/crossref_metadata_2025 huggingface dataset:
Creep Behavior and Mechanical Properties of Carbon Fiber Nano-Composites
Authors: Li Yi Luen , Shen Ming Yuan , Chen Wei Jen , Chiang Chin Lung , Yip Ming Chuen
Published: September 2011

In recent years, it has been observed that surface modification of carbon nanotubes（CNTs）influences on CNT’s distribution among epoxy resin and affects the mechanical properties of CNTs. Accordingly, the treatment of CNTs to with organic acids to oxidize them generates functional groups on the surface of CNTs. This investigation studies the consequent enhancement of the mechanical properties of CNTs. The influence of adding various proportions of CNTs to the epoxy resin on the mechanical properties of the composites thus formed is investigated, and the strength of the material is tested at different temperatures. The creep behaviors of carbon fiber (CF) /epoxy resin thermosetting composites and CNTs/CF/ epoxy resin composites were tested and analyzed at different stresses, orientations of fiber, temperatures and humidities. The creep exhibits only two stages- primary creep and steady-state creep. The effects of creep stress, creep time, and humidity on the creep of composites that contain various proportion of CNTs were investigated at various temperatures. Additionally, increasing the number of cycles in cyclic creep tests at room temperature resulted in a decrease in creep strain even at a high temperature of 55°C. Possible room temperature creep mechanisms have been proposed and discussed. With increasing number of creep tests, the creep strain decreased due to strain hardening which occurred during creep. Creep strain is believed to increase with applied stress, creep time, humidity, temperature and degree of the angle θ between the orientation of fiber and the direction of the applied stress. Moreover, the test results of creep strain of CF/epoxy resin composites and CNTs/CF/epoxy resin composites tested under various conditions can be smoothly fitted by the fitting curves of Findley power law. Finally, the test results also indicate that mechanical strength increase with the amount of CNTs added to the composites. Different coefficients of expansion of the matrix, fiber and CNTs, are such that overexpansion of the matrix at high temperature results in cracking in it. An SEM image of the fracture surface reveals debonding and the pulling out of longitudinal fibers because of poor interfacial bonding between fiber and matrix, which reduce overall strength.
Technical Study on the Key Parts of Combine Harvester Operating Virtual Test Based on ADAMS
Authors: Yang Zi Dong , Peng Li Fang
Published: September 2011

According to the purpose and requirements of a virtual test, the complex mechanism of the combine harvester was abstracted and simplified to some extent during modeling, but in order to guarantee the closeness between simulation result and the reality, attention was paid to keeping the total mass of all components close to the actual mass of the combine harvester and reducing workload during modeling. The vibration test of the cutting platform includes horizontal vibration and vertical vibration. The test conditions are that: the combine harvester is still and has no load and only the engine runs, or the engine and the cutting knife run simultaneously. Three horizontal vibration testing points and three vertical vibration testing points were arranged on the side of the cutter rack of the cutting platform, the side of the shield of the cutting platform and the side of the gap bridge.
The Research on Discrete Element of Blade Part In Powder Injection Molding
Authors: Liu Yu , Li Yi Min , Xia Qing Kun , He Hao , Wang Guang Yao
Published: September 2011

The 3D injection discrete element model of blade injection part is constructed. PFC3D is used to program for filling simulation and analysis. The simulation result shows that there is anisotropy and filling in injection direction first. There is difference between results by discrete element and by Moldflow software. There is large contact stress in reverse direction in sharp angle region and it is filled at last. The injection test result shows that the injection discrete element model is feasible.
The Steady-State Thermal Characteristics Analysis of Precise Composite Grinding Machine
Authors: Zhao Hong Lin , Chen Rui , Huang Yu Mei , Zhang Guang Peng , Wang Bo , Mu Dong Hui
Published: September 2011

It is commonly used method to analyze the overall thermal characteristics of mechanical structure without considering the thermal contact resistance of components. But in terms of precision composite grinding machine, the impact of thermal contact resistance can not be ignored. On the basic of thermal contact resistance characteristics, this article gives the concept and empirical value of the equivalent area factor. By calculating the equivalent contact coefficient, the thermal contact resistance characteristics were integrated into the grinder simulation. According to the structure and processing characteristics of grinder, grinding machine was analyzed in two parts respectively to get the pattern of temperature rise and thermal deformation. Analysis shows the impact that thermal deformation has on working accuracy, so as to provide basis to the compensation of numerical control system to improve the working accuracy.
Optimum Design of Engine Test Bench Based on Finite Element Analysis
Authors: Wen Shao Bo
Published: September 2011

A test bench of vehicle engine is designed and the three-dimensional solid model is established in UG software. Then the model is imported into ANSYS software to conduct static stress analysis, the stress and deformation distribution of test bench are obtained, referenced the results and the bracket are optimized to improve support ability, the maximum stress and the maximum displacement of test bench decreased 66.9% and 76.9%, respectively. Lastly modal analysis of test bench is performed, the chassis base is strengthen design according to the first-order mode shape, then the first natural vibration frequency is heightened 91.0%, it is far away from the engine excitation frequency range, the stability of test bench is enhanced.
Mathematical Consideration on a Robustness Index for Adjustable Control Factors
Authors: Kato Takeo , Kimura Suguru , Matsuoka Yoshiyuki
Published: September 2011

Due to increased diversity of user needs and market globalization, use application and environment of the products have diversified. This causes the products are difficult to be designed. In other words, it is difficult for designers to find a unique design parameter value (a unique design solution) which assures the fluctuant products performance to be satisfied the design requirements. In such cases, the designers derive several values (range) of design parameters which can be adjusted by users or manufacturers and enable to satisfy the product performance by the adjustment. Unfortunately, the kind of design problems have not discussed sufficiently in the conventional robust design researches. This paper describes a robustness index which is applicable to such design problems and a mathematical consideration on a calculating method of the index using the Monte Carlo method.
Three-Dimensional Manifold Checking Based on VB.NET
Authors: Zhang Zhi Wei , Xin Yang Gui , Zhang Wei , Song Jin Chun
Published: September 2011

This paper describes SolidWorks secondary development based on VB.NET and focuses on introducing design process of automatic checking of three-dimensional hydraulic manifold block. The auto-checking process achieves automatic checking, establishes an excel table automatically and writes oil hole information, intersecting hole numbers, and phase interferential holes into the excel table successfully.
A Method of Interactive Surface Free-Form Deformation Based on Control Point and Neighborhood Constraints
Authors: Peng Chao Hua , Liu Fei , Li Li
Published: September 2011

In view of the problem that it’s hard to determine the control points and morphing is not intuitionistic in traditional surface free-form deformation technology, an interactive surface free-form deformation method is proposed in this paper. Using this method, the user no longer needs to dynamically set constraint points outside the model. The point picked up by the user according to the desired deformation is used as a control point, and the neighborhood range of deformation or the deformation shape is controlled by deformation function. The designer can interactively deform the model simply by setting control parameters. The experiment results by applying the method to face modeling show that the proposed method is feasible and effective, providing a convenient way for the local modification of three-dimensional models.
A New Approach to Fatigue Damage Modeling of Composite Laminates
Authors: Mu Peng Gang , Wan Xiao Peng , Zhao Mei Ying
Published: September 2011

Fatigue damage of composites can be described by the residual stiffness and residual strength, and the same damage state can be described by the two mechanical parameters equivalently. Based on this assumption, a new pair of fatigue damage accumulation models are established to simulate fatigue behavior and predict the fatigue life of composites. Each of two equations contains three parameters and has the similar form, and the power function relationships between the two damage indices are constructed. The proposed model, combining with constant life diagrams and failure criteria are used to estimate the fatigue life of composites, and good agreement is observed between the present model and experimental results.
Optimal Control of Error Performance of Planar 3-DOF Parallel Mechanism
Authors: Lu Kai Jiang , Shi Jun Ping , Zhang Feng Tao
Published: September 2011

Abstract. The optimal control strategy is introduced to improve the motion accuracy of planar 3-DOF parallel mechanism. The optimal control of error performance of mechanism is achieved by structuring and quantizing the quadratic form index of the error performance, and taking into account both the system response and energy control in state space, so we study the problem which can be boil down to solve two-point boundary value problem of differential equation. The simulation results show that the actual motion of mechanism keep the better tracking accuracy with the global motion while dynamics parameters is changing, and the controller is ease to accomplishment in the industrial due to the simply structure and the stable change of control energy.
Investigation on Dynamic Mechanical Properties of Tungsten Fiber Reinforced Metallic Glass Composite
Authors: Chen Gang , Chen Xiao Wei , Pan Xiao Xia
Published: September 2011

Recently developed bulk metallic glass (BMG) alloys have attractive mechanical properties for structural applications, and tungsten fiber reinforced bulk metallic glass matrix composite(BMGC) would further improve the properties compared to un-reinforced BMG. With INSTRON1196 test machine system and SHPB experimental system, quasi-static and dynamic compression experiments on tungsten fiber reinforced bulk metallic glass matrix composite were carried out. The material flow stress is about 2200MPa in quasi-static, and the dynamic flow stress of the material is around 2800MPa with strain rate of 740 s-1. The specimen fails with the form of axial cracks
Extraction of Machine Fault Signal Based on Discrete Wavelet Transform
Authors: Yang Xian Zhao , Cheng Geng Guo
Published: September 2011

The impact signal is contained in the fault signals of some pivotal components such as bearings and gears. Extracting weensy impact information is an important method to diagnose equipment. With the combination of discrete wavelet transform and spectrum analysis, extracting the nonstationary signals from vibrating signal in machine is a practically effective means of diagnosing the fault signals and their types so as to anticipate machine faults. It is very effective to extract impact information in application by utlizing the discrete wavelet transform.
Test Methods for Rheological Properties of Self-Compacting Concrete Pastes
Authors: Ma Bao Guo , Wang Hui Xian , Huang Jian , Song Liu Qing
Published: September 2011

This paper provides a general study on cement paste flow which derived from self- compacting concretes. Rheometer, Marsh cone and mini-slump cone were used to evaluate fluidity of cement pastes containing superplasticizers of different types and dosages and loss of fluidity over time. There is a superplasticizer saturation dosage beyond which no significant fluidity increase can be found. This paper evaluated the effect of these three methods using rheometer as control and the optimum superplasticizer type for the preparation of self-compacting concrete was suggested.
Shock Analysis on Dual-Mass Silicon Micro-Gyroscope
Authors: Ni Yun Fang , Li Hong Sheng , Huang Li Bin , Yang Bo
Published: September 2011

Survivability in shock environment is an important reliability index of silicon micro-gyroscope. Shock response of dual-mass silicon micro-gyroscope is investigated in this paper. A lumped mass model was established for the micro-gyroscope based on the characteristics of the dual-mass structure. Analytic solution to the response of the structure under shock load in a half-sine acceleration form was then acquired. The analytic solution was applied to calculate the shock response of a well designed dual-mass silicon micro-gyroscope in our laboratory, while the correctness of it was verified with finite element method (FEM) in ANSYS. The analytic solution is serviceable in reliability prediction of dual-mass silicon micro-gyroscope in shock environment.
Research on Energy-Saving Technology Based on Optimization of Mechatronic System for Coal Mine
Authors: Zeng Qing Liang , Wang Xi Wei , Zhao Ping Qiang
Published: September 2011

In this paper, in view of the energy consumption problems of coal enterprises ,the overall technical framework of high efficiency and energy-saving for coal mines is proposed, and staged structure optimization model and network matching optimization model of mechatronic systems for coal mine are established ,which provide a theoretical basis for optimizations of mechatronic systems and promote the development of energy-saving technologies of coal mines.
The Sensitivity Analysis of Engine Mounting System’s Inertial Parameters Based on the Orthogonal Test
Authors: Lei Fang Hua , Sun Ning , Tang Wei Lin
Published: September 2011

This paper analyze the variation of the inertial parameters of the powertrain based on the orthogonal test, and their effect on the vibration characteristics of the system. Then the paper designs a test plan of the two levels orthogonal test with 6 facts by establishing a mathematical model of 6-dof in engine-mount system. We spend 8 times having done the orthogonal computation with MATLAB. The experiment results bring us the average of the changes of two levels decoupling owned by the mounting system's 6 rank inherent characteristics on each direction .And this changes are caused by the fluctuating of inertial parameters. Finally, we analyze the variation of the rotational inertial and the inertial integrated parameters, and their influence on the quality level of the sensitivity on the all decoupling parameters in engine-mounting system on each direction. Combined with the calculation examples in the thesis, we discuss the individual inertial parameters of the engine-mounting system ，which is the crucial design parameters of sensitivity analysis, and have provided a parameter basis for the design of engine-mounting system.
Study on the Accuracy of Web Offset Press’s Fold Mechanism
Authors: Yuan Ying Cai , Li Yan , Wang Yi Ming
Published: September 2011

The cutter’s lateral displacement along the paper’s movement is the main reason which causes the folding accuracy problem. The folding stem is deformed in actual working condition, which causes the cutter emerge lateral displacement. The structure of folding stem is complex, it needs the combination of mechanics and finite element analysis to get the fitting formula relation of the folder’s deformation and the loadings. By the dynamic coefficients, which express the relation of loadings between the working velocity and clearances, the cutter’s lateral displacement model is established based on studying the relation of the cutter’s lateral displacement and the folder stem’s deformation. By the model, the folding accuracy is studied in different working velocities and conditions.
The Application of Single Point Incremental Forming Technology of Sheet Metal in Bus Prototyping
Authors: Liu Gang
Published: September 2011

First of all, the theory, advantages and application of the Single Point Incremental Forming (SPIF) technology of sheet metal are introduced at the beginning of this paper; second, the traditional forming technologies of bus’s face and back in Chinese bus industry are compared; third, The advantages of the SPIF Technology of Sheet Metal in Bus Prototyping are analyzed; finally, the steps and methods of bus’s face design and prototyping with SPIF technology are elaborated through a real business case.
Study on Simulation of Dynamic Meshing Force of High Speed Gear System Based on ADAMS
Authors: Wu Li Mei , Yin Tu Bang , Su Fu Lian
Published: September 2011

Based on 3d modeling software Pro/E, gear system solid model was built by using parametric modeling method. The virtual prototyping model of the gear system was established based on ADAMS. Then the dynamic meshing force of gear was simulated. The ruler and magnitude of mesh force was researched while the gear transmission system worked in the situation of high speed and great torque, and the numerical simulation of the gear dynamic meshing force has been realized, which provide accurate data for the strength and fatigue analysis of gear system.
Dynamic Characteristic Analysis of CNC Machine Tool Frame
Authors: Sun Lei , Wang Ming Hai , Li Xiao Peng , Sun Yue
Published: September 2011

A three-dimensional model of a machine tool frame was established. The modal analysis and harmonic response analysis were done by means of finite element method. Its characteristics of vibration modal were obtained.Then we select one point in the largest deformation area and make the harmonic response analysis. The analysis is conducive to the design of the machine tool frame and it is of great significance for improving the quality of design of machine tools.
The Transient Response Analysis for the Damped Free Vibration of Plywood Box
Authors: Ding Yi , Xiang Ying , Zeng Shan Qi , Yang Yan Bo
Published: September 2011

Aiming at the unreasonable phenomenon of the plywood box′ design in the current market, the mechanics research for the structure design of the plywood box was taken. In this paper, a damping spring-mass system for the plywood box is established by using the finite element analysis software ANSYS. In the case of simulated external pressure, analyzed the transient dynamic response, the relation between displacement and time, stress and time were gained in order to verify the structural reliability of the damped free vibration of plywood box during the carriage. Finally, the reliable basis for the design of plywood box was provided, the certain reference value of the standardized and the serialized production for plywood box was provided, as well as the basis of some analysis for the design of cushioning.
APDL Based Vibration Optimization of a Ship Foundation
Authors: Pang Fu Zhen , Jin Ye Qing , Yao Xiong Liang
Published: September 2011

Based on the structural dynamics optimization theory, a vibration optimization design method of a ship foundation by APDL language is presented in this paper. Structural dynamic optimization design of a ship foundation under the constraint of gross weight of a ship cabin is performed by ANSYS to minimize the vibration of ship hull plating. Optimization shows that the thickness of webs has considerable influence on the vibration isolation performance of ship foundation, while changes of the thickness of base panels and brackets have insignificant influence. Optimal thickness combination of webs, panels and brackets of the foundation is obtained through the optimization. Study also provides reference for practical engineering as well as enriches theories and methodologies of novel vibration isolation for ship foundation design.
Workspace Analysis and Mechanical Innovation of YWZ Dexterous Hand
Authors: Yang Wen Zhen , Zhang Hua , Yu Shi Guang , Chen Wen Hua
Published: September 2011

Degrees of freedom (DOFs) and workspace are important factors to evaluate the flexibility of the dexterous hand. This paper develops an original dexterous hand, which has 20 active DOFs and adjustable thumb. Imitating the human hand bone structure, we design a full driven multi-fingered anthropomorphic robot hand (YWZ dexterous hand). For the thumb of YWZ dexterous hand, we innovatively design a metacarpal phalange mechanical structure to adjust thumb’s assembly position and radial orientation relative the palm. We construct coordinate systems to deduce the finger kinematic equations and analyze the finger workspace. A physical prototype of YWZ dexterous hand was manufactured to test its kinematic characteristics and workspace. Experimental results validate the YWZ dexterous hand has large workspace, excellent operating flexibility.
Research and Design on Smoke Cleaner for City Street
Authors: Yang Li Fang , Fu Yan Ping , Zhao Yue
Published: September 2011

Though the cars make our life more convenient, they are pumping huge amounts of waste gases into the atmosphere. These gases are very harmful, they can cause disease and even death. Through investigation and research, the paper takes forth street cleaner as a solution to the air problem and in the meanwhile, city landscape is incorporated into the design of street cleaner. Considering its feasibility, the cleaner will be proposed to be fixed on pole of street lamp. Through the fixing method, the power supply of cleaner can either rely on the street lamp or wind energy and solar energy. The cleaner can both alleviate the city air pollution and be a city landscape and give a novel idea to control city air pollution.
Tribological Properties of Spherical Plain Bearings with Self-Lubricating PTFE Woven Liners
Authors: Qiu Ming , Gao Zhi Lun , Wang Guo Feng , Chen Long
Published: September 2011

The friction and wear behaviors of three kinds of spherical plain bearings with PTFE fabric composite liners were investigated by a high oscillating frequency and heavy load tribo-tester. Dry sliding tests were carried out at different oscillating frequencies. With the help of SEM and EDS, the differences of worn surfaces of the three spherical bearings were investigated. The results indicate that the fiber woven with PTFE effects the friction and wear characteristics of bearing, the tribological properties of bearing with Kevlar/PTFE fiber woven liner is the best in the three kinds of bearing. The abrasive wear are appeared on the surface of wore liners of bearingⅠ,while bearingⅡappeared normal wear, bearing III showed serious adhesive wear and abrasive wear.
Research on the Complete Dynamical Model of Tilting-Pad Bearings Considering the Coupling Moving of Shaft and Pads with Turbulent Oil Film
Authors: Zhang Zhen Shan , Dai Xu Dong
Published: September 2011

Considering the coupling moving of shaft and pads, a theoretical model for calculating the complete dynamic coefficients of tilting-pad bearing is described in this paper. The model includes the influence of turbulence. Based on this model, the effect of turbulence on journal equilibrium position, pads inclinations, and complete dynamic coefficients is investigated for given load cases. The numerical results indicate that the effect of turbulence is not neglected for higher Reynolds number.
The Movement Analysis and Research of 4R Multi-Joint Manipulator for the Loading and Unloading
Authors: Tao Ke , Chen Ting Ting , Liu Li Ying
Published: September 2011

This paper studies the problem of multi-joint robot with four degrees of freedom that is used in the process of loading and unloading, the method of homogeneous coordinate transformation is used to achieve the exchange between the implementation end of the space coordinate and the joint angle. Providing the theoretical reference and a basis of calculating for the follow-up study, and ultimately meeting the actual needs of production.
Automated Assembly of Ship Panels Using an Integrated Robotic Tool
Authors: Shafiee Kamran , Pan Zeng Xi , van Duin Stephen , Larkin Nathan
Published: September 2011

In this paper we developed a novel and cost effective automated system for use in the Australian shipbuilding industry. We began by investigating current shipbuilding processes and determining the most feasible area where automation could be further developed. Then we designed an automation concept with the objective of developing a highly flexible system. A prototype of the integrated tool was developed for preliminary testing in a simulated industry assembly process, the results of which were benchmarked against a manually fabricated assembly. The outcomes from the benchmarking showed the feasibility of such a system and allowed us to determine the future direction for further development of the integrated tool.
3D Reconstruction Based on Binocular Stereo Vision of Robot
Authors: Niu Zhi Gang , Li Li Jun , Wang Tie
Published: September 2011

In order to meet the need of identifying obstacles and navigating for the Coal Mine Detection Robot which is used to rescue life and detect environment from coal mine disaster, binocular stereo vision is researched and 3D model of objects around the robot is reconstructed by means of two cameras of visual system built in the robot. The two cameras are calibrated and two projection matrices of them are obtained. Then, two images of the same scene are obtained by the two cameras. The matching points of two-dimensional coordinate are got through Harris corner extraction and stereo matching. According to the principle of binocular vision, equations are obtained and solved by least square method, which can calculated the discrete points of 3D coordinate.
Gasoline Engine Idle Speed Control Based on PID Fuzzy Algorithm
Authors: Zhang Cui Ping , Sun Li Ping , Yue Zhi Ying
Published: September 2011

According to the characteristics of operating procedures of gasoline engine idle speed; a fuzzy control method is developed to control idle speed of gasoline engine. A novel controller is designed. The controller, which combines fuzzy logic algorithm with traditional PID algorithm, improves steady and dynamic performances of idle speed control. The method has the advantage of not requiring a precise mathematical model of the controlled object. By using SIMULINK simulation software of MATLAB, the simulation results obtained with the PID fuzzy controller show that the PID fuzzy controller has better controlled performances and robustness. It provides some reference values for further practical application.
Research of Technology of Cutting Hardened Steel in HSM
Authors: Zhu Xiao Jun , Xia Wen Sheng
Published: September 2011

The key technology of the cutter that cutting hardened steel was researched by high speed milling machining method. At first ,three cutting elements of high speed milling machining was narratived, and we can obtain the principle of selection of parameters of cutting velocity, feed per tooth, longitudinal cutting depth and cutting width of axial, etc. With HSM ,we discussed the performance and selection points of tool material of coated cemented carbide, ceramic, cubic boron nitride , synthetic diamond and so on, and obtained the effect of the main tool geometry for the cutting process in HSM. The second, it analysised type and reason of damage of high speed cutting tools, and introduced three detection methods of tools. Finally, it was summarized and concluded.
Modeling and Simulation the Semiconductor Lasers Diode Temperature Controlling
Authors: Xing Xue Feng , Li Hong Zuo
Published: September 2011

A semiconductor Laser Diode (LD) temperature control system based on Ziegler-Nichols tuning PID was introduced. According to the requirement of temperature stability in the LD system, the parameter auto-tuning Ziegler-Nichols algorithm and analog circuit was adopted to carry on the control of temperature.
Study on Cutting Forces of Mg-6Nd-4Gd-3Y Magnesium Alloy in High-Speed Milling
Authors: Wang Zhen Hua , Yuan Jun Tang
Published: September 2011

In this paper, 24full factorial design and homogeneous design were applied to the high-speed milling experiments for Mg-6Nd-4Gd-3Y magnesium alloy. According to the experimental results of cutting force, the effect of cutting parameters (cutting speed, feed per tooth, depth of cut, and width of cut) on cutting force was discussed, and the nonlinear polynomial regression models of cutting forces based on the cutting parameters were presented by the partial least-square regression.
Development of Adjustable Signal Generation System for Uniform Droplets Spray
Authors: Gao Sheng Dong , Wang Yang , Wu Yan , Li Wen Bin
Published: September 2011

The generation of uniform droplets in the size of hundred microns was described in this paper. An experimental device capable of producing uniform droplet has been developed. For the purpose of adjusting the signal generator for both continuous droplets spray and drop-on-demand, the piezoelectric driving signal was set up with a PC and software of Labview. With the signal generation system, Flexible signal adjustment appears to be more suitable than simple signal generator to generate uniform droplets.
Flying Referencing System for an Autonomous Mobile Robot
Authors: Yu Ying , Mao Yan Fen , Wiedmann Hans , Wang Yu
Published: September 2011

In CDHAW of Tongji University an autonomous mobile robot system, is actually used for education of Bachelor students in the majors AES (Automotive Engineering & Service) as well as in MT (Mechatronics) and for development and research on different topics of both majors. One such research project is introduced in this paper. It aims to improve the inaccuracy of the robots built-in navigation system based upon odometry by development of a flying referencing system. It is described how the well known raster navigation is extended from a single point raster to a grid of lines which improves navigation correctness much better as by using the single points of the conventional raster navigation method.
T320 Heavy Fell Boring Structure Design and Optimization
Authors: Yang Shun Tian , Zhang Wan You , Cui Da Wei
Published: September 2011

Large weldments, large-sized forging balancing machines are not suitable for general, and the machine's bearing capacity, scope of work and cutting efficiency is a severely restrict, T320 floor type successful development of solving the problem, the main design thought reveals large and super-heavy parts processing features, and the machine's structure design, thermal equilibrium system, the inertia parameters matching and the optimization of many original place, its multi-dimensional large Angle milling head device belongs to universal accessories device, broke through the domestic and foreign various types of special Angle milling head structure form.
Simulation Study on a Controllable Mechanism Type Novel Planar 3-DOF Mechanical Excavator
Authors: Pan Yu Chen , Cai Gan Wei , Wang Hong Zhou , Wang Jian Liang
Published: September 2011

This paper introduces a simulation study on the executive mechanism of a recent invented controllable mechanism type novel planar 3-DOF mechanical excavator using simulation analysis software MSC.ADAMS. A virtual prototype model is established first, based on which the forward kinematics simulation is carried out employing the DIM functions to achieve an output trajectory similar to the excavating process of a flexible hydraulic excavator. Subsequently, an inverse kinematics simulation is performed accomplishing a given V type output trajectory. Angular displacements, velocities and accelerations of the three input variables are obtained. Results of the simulation study may provide some useful references for further researches such as dimensional synthesis, dynamics and design of the controller of the new type of mechanical excavator.
Investigation on Microstructure and Wear Properties of an In Situ Synthesized TiC Gradient Coating
Authors: Xu Liang , Zhao Hai Xia , Hui Li , Ma Shao Hua , Zhou Song , Zhang Ying Ying , Wang Yan
Published: September 2011

An in-situ synthesized TiC gradient coating was prepared on a Ti600 substrate. .Results indicated that the microstructure and chemical compositions of the gradient coating exhibited a continuous gradient distribution. The most outer coating has an excellent comprehensive properties. The gradient coating has a good wear resistance, under dry sliding wear condition. The granular wear is the main way for the coating wear. The hardening mechanism for gradient coating are second phase strengthening, grain refining strengthening and solid solution strengthening.
Effect of Different Fermentation Conditions on the Nitrite Concentration of Carrot-Pickles Fermented by Lactobacillus Preparation
Authors: Li Wen Ting , Che Zhen Ming , Xing Ya Ge , Li Ming Yuan , Xiang Wen Liang , Tang Jie , Zhu Sheng Hua
Published: September 2011

Pickle is normally served as a side dish with the main meal or used as an appetizer and also favored by many Chinese. However, the accumulation of nitrite is a common problem faced during many vegetables fermentations. Effects of different fermentation conditions on the nitrite concentration were investigated during the preparation of lactobacillus pickles by using the modern biological technology. The results showed that the salt, lactobacillus preparation and some accessories could reduce the nitrite content during the carrot-pickles fermentation, and improve the safety of lactobacillus preparation pickles.
A New Measurement Method of Rotary Precision of Lathe Spindle
Authors: Zhang Dan , Wu You De , Wu Xian Wen , Wang Rui
Published: September 2011

Rotary precision of the lathe spindle directly affects accuracy of the machined work-piece. With continuous improvement on requirements of rotary precision of the lathe spindle, a more accurate measurement method is needed to adopt to reflect actual shape precision of unprocessed part. Some advanced measurement principle and methods about rotary precision of the lathe spindle are researched, and also the measurement error is analyzed. The measurement result gotten by sensor concludes two parts, one is eccentric error caused by installation of the base ball, and the other is rotary error of the lathe spindle. The eccentric error is separated by the way of filter, as well as the rotary error is quickly and correctly measured by unidirectional digital measurement. The rotary error is superimposed on a base circle generated by algorithm. The roundness error is assessed by MZC. At last, verifying the feasibility of the new measurement method by means of real experiment.
Research of Sapphire Wafer Scribing by Using UV Laser
Authors: Wang Mao Lu , Qin Lei , Wang Yang , Zhou Ming
Published: September 2011

The Processing advantages of UV laser were discussed in this paper. A series of experiments were carried out, some good results was achieved, which proved UV laser is fit for sapphire wafer processing. Then how processing parameters affects machining quality was discussed, which provides guidance to machining practice. The formation of grooves with good surface quality can be achieved by selecting appropriate laser parameters.
Enhancement of Fluid Mixing in a Double T-Shaped Micromixer by Periodic Disturbances of Pressure
Authors: Chiu Huan Chao , Chen Jerry M
Published: September 2011

This paper presents numerical simulations of mixing phenomena in a double T-shaped micromixer to which periodic pressure disturbances are added to enhance the mixing efficiency. The fluids were brought in contact at the upper T-junction. The pressure disturbances of various frequencies (0-50 Hz) and phase angles were introduced through the side channels of the lower T-structure. The simulations were carried out for microchannels having the same cross-section area but with different aspect ratios (1.6-10) at low Reynolds numbers (2.9-8.8). It is found that the mixing efficiency rapidly increases with an increase of the oscillation frequency in the lower range (0-8 Hz) to reach a maximum and then decreases in the higher frequency range except for the in-phase disturbance. The mixing is enhanced most significantly as the two pressure disturbances oscillate exactly out of phase. The effects due to channel aspect ratio and inlet velocity are also discussed.
Research and Designment of Untouched Phase-Detecting Sensor for High-Voltage Line
Authors: Ji Xi , Zhang Xue Wu , Tang Jia Neng
Published: September 2011

Phase and frequency are two important parameters of the industrial-frequency AC signal in in the high-voltage electric power system. Phase-detecting experiments are more frequently and importantly required at the scenes of completion and commissioning. As the so-called phasing, the detecting experiment mainly includes detecting the phase and phase sequence, which means to measure the phase difference between the two power line. Meanwhile, in the monitor of power system, factors such as power factor , active power P, wattless power Q and electricity consumption are commonly needed to be monitored, and these factors are directly related to the volume of the AC current and voltage phase difference angle . The paper proposed an untouched phase-detecting sensor for the high-voltage power lines. The sensor is developed in the full hardware method based on digital-to-analog circuit and moreover equipped with wireless communication interfaces. Not only facilitating remote transmission of the phase information, it also can be widely applied in the power industry such as measurement of high-voltage wire phase, phase detecting, voltage measurement and electricity detection
Effect of Mold Powder on Faint-Sliver Defect in if Cold-Rolled Steel Sheet
Authors: Wu Guo Rong
Published: September 2011

Mold powder entrapment is one of the affecting factors on faint-sliver defect in IF cold-rolled steel sheet in casting process. Based on the analysis of the defect, the composition of mold powder is adjusted. Otherwise, surface tension and viscosity of mold powder are raised. After taking these measures, mold powder entrapment and casting subcutaneous slag is decreased obviously. In addition, the rate of faint-sliver defect in cold-rolled IF steel sheet has been reduced from 5.21% to below 1.0%.
The Boron Effect on Mechanical Properties of Aged 2024 Aluminum Alloy
Authors: Khatami Neda , Mirdamadi Shamsoddin , Razavizadeh Hekmat
Published: September 2011

2024 Aluminum Alloy is widely used in aeronautical applications. The Alloy's strength is increased by Precipitation Hardening which is the aging and solution of strength and is widely used in T6 state. Bearing in mind the effect of Boron in shorting the aging time, the pure material of B2O3 was used in order to add Boron to 2024 Alloy, so Alloying was done. By testing mechanical properties and microstructure observations, good results were achieved in Boron effect on this alloy's quench in comparison with those alloys lacking Boron. The outcomes depicted that this element addition increases hardness and tensile strength in aging process. In a way that the hardness of the alloy after controlled quench in one hour natural aging was reached to 93HB from 73HB and to 134HB in one hour artificial aging in 110°C. Such difference in hardness amount is due to better distribution of precipitates.
Research on Passive Control of Pressure Swing Adsorption System of Alternating Double Tank
Authors: Chen Kun , Zeng Xiang Wei , Qiu Xiao Ping
Published: September 2011

This paper introduces a new double tank alternative PSA system structure and working principle, the system uses passive control, namely the use of fluid energy to achieve their double tank alternating work and avoid expensive and complex control systems, only two valves instead of the traditional 7-10 valves, greatly simplified the structure, improve system security and reliability. At the same time, the thesis also introduced shuttle-type three-way diffluence regulation valve structure and theory.
Experimental Study of Self-Cleaning Plate Shell Heat Exchanger
Authors: Zhou Yang Min , Li Chao , Xu Li Li , Luo Si Yi , Yi Chui Jie
Published: September 2011

A heating experimental system using waste heat from washing Blast Furnace Slag (BFS) water is designed. The effect of corrugated angle, on the property of self-cleaning plate shell heat exchanger and the system typical working conditions was investigated. The results show that: the corrugated angle, as the key factor for the heat transfer property of self-cleaning plate shell heat exchanger, produces intense turbulent flows. It enhances the heat exchanger efficiency and reduces the scaling on the plate.
Effect of Annealing on Calcium Carbonate Morphology of Mollusk Shell
Authors: Chang Zue Chin , Lin C.B , Ho Jin Sin , Shao Chih Kai
Published: September 2011

After the aragonite nacreous layer and cross section of Periglypta Magnifica mollusk shell were annealed, the influences, including crystallization temperatures, crystallization time and concentrations of calcium chloride aqueous solution on the crystal morphology of annealed shell was studied. These three factors evidently influenced the crystal morphology of calcium carbonate, whose annealed morphology was different from its origin. In addition, the cross section of annealed shell contained three crystallized regions of calcium carbonate.
The Mechanical Properties of Gray Cast Iron and Metallographic Structure Effect on the Chip Shape
Authors: Huang Xiao Bin , Ye Yu Gang , Shen Xing Quan , Chang Xing
Published: September 2011

The cutting tests were carried out on HT200, HT250 and HT300 cast iron. The effects of the strength, hardness, microstructure, chemical composition of cast iron on chip shape were studied. The results show the relationship of different strength, chip thickness and chip deformation of gray cast iron, in the similar cutting conditions.
Steady Rheological Properties and Microstructure of Polycarbonate/Highly Branched Polystyrene Blends
Authors: Li Ai Ying , Chang Jie Yun , Zuo Xiao Bing , Yuan Rong Xin
Published: September 2011

Blends of polycarbonate (PC) and highly branched polystyrene (HBPS) were prepared by melt blending. The steady rheological behavior of them was determined using a capillary rheometer, furthermore, the effect of shear rate, temperature and the blend component on the viscosity of the blends was discussed. The results showed that all the blends exhibit the nature of the pseudo-plastic fluids, and the viscosity of them decreases dramatically with the increase of temperature and does slightly with the increase of shear rate. At a fixed shear stress, the viscosity of the blends is decreased with the increase of the HBPS content. Microstructure studies using SEM showed that all the blends are characteristic of a two-phase morphology, with spherical droplets of the minor HBPS phase dispersed in the continuous PC phase.
Design of Embedded Monitored Control System for Ultrasonic Reaction Kettle
Authors: Wang Bao Qiang , Yang Liang Liang
Published: September 2011

Ultrasonic effect is widely applied in biomaterial treatment and this process will happen in ultrasonic reaction kettle of which physical parameters directly affect the treatment effect. This paper introduces a kind of monitored control system of ultrasonic reaction kettle and mainly presents the realization method of key units. Depending on embedded technology, this system includes three layers control unit: ARM central control layer, PC control layer and bottom CAN intelligent node layer which has sensors and actuators. Linux operating system has been transplanted on ARM processor as the software platform. Through the practical hardware arrangement and software design, it can be proved that this system can effectively and accurately monitored control the parameters of ultrasonic reaction kettle.
Application of Modular Programming Based on Virtual Instruments in Industrial Measurement and Control System
Authors: Lu Qian Qian , Shao Wei , Xia Chun Lin
Published: September 2011

At present, virtual instrument technology has been widely used in all kinds of tests, measurements and automation fields. Test software is the mainstay of virtual instrument, which plays a key role during the process of implementing test task. In order to meet the flexibility of test items and variability of parameters about industrial testing objects, this paper introduces a modular programming idea by using software of virtual instrument. This idea divides all test items into sub-modules due to different function of test items, so as to recombining some sub-modules to satisfy new requirements of different tests. This method is used in an actual software design for industrial test system, practical application shows that this software design method of modular programming is not only realize the flexibility and generality of automation test system, but also provide a good platform for the secondary development of test program.
Development of Air Hammer with Self-Propelled Round Bit and the Contact Analysis of the Key Components
Authors: He Chao , Han Lie Xiang , Chen Xiao Bin , Chen Li
Published: September 2011

Within the vertical section, ROP of the conventional air hammer in gas drilling is several times or even several dozen times than that of underbalanced drilling. Gas screw with conventional air hammer has not been successful in direction gas well, which greatly limits field of application of air hammer, so this paper carries out development of the air hammer with self-propelled round and analyzes the principle of work of air hammer with self-propelled round bit, the contact analysis and design of spiral rod, and spiral nut which are the key components.
Implementation of Lean Manufacturing in Saudi Manufacturing Organisations: An Empirical Study
Authors: Karim M. Azharul , Aljuhani Mubarak , Duplock Ray , Yarlagadda Prasad
Published: September 2011

Abstract: In this paper, the level of lean manufacturing implementation by Saudi manufacturing companies is investigated, the extent of application of lean manufacturing practice is identified and the benefits and barriers of Lean implementation are evaluated. The results reported in this paper are based on data collected from a survey using a standard questionnaire administered to 120 manufacturers in Saudi Arabia. Evidence indicates that large size companies are more likely to implement and gain the advantages of lean manufacturing than small and medium size companies. The most implemented lean manufacturing tools are Computerized Planning Systems, TQM, Maintenance Optimization and CIP. Main barriers against lean manufacturing implementation include the organization culture, lack of management commitment and lack of skilled workers. Results also show that benefits gained from lean manufacturing implementation are significant and are correlated with the level of implementation of lean strategies.