bluuebunny/crossref_metadata_2025 huggingface dataset:
The Research on the Model for Calculating Relative Acoustical Amplitude on Interface I Based on Attenuation Theory of Acoustic Wave
Authors: Ai Chi , Meng Xiang , Hao Ming , Zhao Wan Chun , Zhao Hui Zhi
Published: November 2012

Acoustic wave can cause particle vibration in the process of transmission and the energy consumption gradually, and the acoustic wave amplitude will attenuation. Through analysising the propagation path of acoustic wave in the layer media in the process of well cementation., according to the theory of acoustic wave attenuation, the model for calculating the relative acoustical amplitude of well cementation on interfaceⅠ. And on this basis, to discuss the influence factors of relative acoustic on interfaceⅠ
Solar Straight Thermal Circumfluence Closed-End Seawater Desalination System Analysis
Authors: Dong Hui Xu , Li Na , Fan Mei Chen , Wen Yu , Dai Jia Qi
Published: November 2012

This paper studies a small prototype of solar desalination device, using the method of directly heating sea water and a double negative pressure evaporation room in the desalination operation. The system uses common sea water, it is cost-effective and can make full use of low-grade solar energy. More over, and the wind power can provide energy for the whole electrical control system, realizing the full closed automation. Through testing and analyzing, the relationship between the main parameters of the system is confirmed; this lays the theoretical foundation for matching each parameter of the whole system, and helps to determine the optimal desalination method.
The Design on the Improvement of the Electric Scooptram’s Cable Arrangement Device
Authors: Han Ying Ye , Zhang Zhao Gang , Zhu Ke Gang
Published: November 2012

Proceeding with eliminating or reducing the faults occurring during the operation of the cable arrangement device for electric scooptrams, this article analyses the fault causes, makes analysis and calculations on the tip relief radius of the screw thread, the shape and abrasive resistance of the spindle shaped block, puts forward the measures on improving the abrasive resistance of the spindle shaped block and meets the operational need of the cable arrangement device.
Study on Geological Structural Characteristics in Zhaoguan Mine Field
Authors: Qiu Mei , Shi Long Qing , Wang Guo Rui , Xu Dong Jing , Sun Qi
Published: November 2012

Based on a great deal of geological data, we analyzed the geological tectonic features of Zhaoguan mine field. On the basis of the analytical method of traditional geology, the paper revealed the general development mechanism of geological structures of this research area. Combined with the fractal theory, and taking the calculation chart of reserve in coal seam as the foundation drawing, the faults and folds can be deeply studied to obtain their fractal characteristics with geological structure complexity in this area quantificationally evaluated.
Using Dbcupe Topology for NoCs
Authors: Mosafaie Razieh , Sabbaghi-Nadooshan Reza
Published: November 2012

In this paper, we introduced dbcube topology for Network-on Chips(NoC). We predicted the dbcube topology has high power and low latency comparing to other topologies, and in particular mesh topology. By using xmulator simulator,we compared power and latency of this topologyto mesh topology. Finally, it is demonstrated that the network has higher power and lower latency than the mesh topology.
Group Technology Utilization inside New Software Application
Authors: Monkova Katarina , Monka Peter
Published: November 2012

The article deals with the utilization of group technology inside new software. This software aids the multivariant manufacturing process plans creation and consequently it supported the processing of information in several versions. It can be used for optimization according to the selected criteria, for the generation of technological documentation and NC programs on the basis of hybrid approach. NC program, as one of process plans form, can be for individual parts generated automatically on the basis of group representative that is created as 3D model in CAD/CAM system. The output of CAM module – CL data – is imported into new software application as the basis of NC program. System was called Individual Application system – IAS.
Hyperelastic Analysis of High Density Polyethylene under Monotonic Compressive Load
Authors: Khalajmasoumi M. , Koloor S.S.R. , Arefnia A. , Ibrahim I.S. , Yatim J. Mohd
Published: November 2012

In the past few decades, design development of high performance machines and devices encouraged industries to utilize advanced materials such as polymers. Special mechanical features of polymer materials such as high strength to weight ratio and etc have increased scientists demands to investigate the nonlinear behaviour of polymers. One of the challenges in mechanic of polymers is to introducing a model that is competent to predict hyperelastic deformations based on long-strain behaviour of polymers. In this study, a comprehensive research is performed on introduced mechanical models for polymer materials. The major attempt was on introducing an appropriate model among the existing models, capable enough to predict mechanical behaviour of high density polyethylene under monotonic compressive load. The procedures of simulation and experimental tests are performed to examine the load capability of the model for high density polyethylene. Several compression tests are performed on High Density Polyethylene cubic specimens to extract the full stress-strain response of the high density polyethylene. Moreover, strain gauge is used in experimental tensile test to determine Poisson’s ratio. Simulation procedure is performed using ABAQUS 6.9EF for a comprehensive analysis and discussion on hyperelastic deformation. The simulation procedure is confirmed and verified perfectly by experimental data. The comparison between experimental result of compression test under monotonic load and finite element simulation of this test is remarkable to know about behaviour of HDPE to use in other structural and mechanical application.
Research for the Turning Vehicles ESP Control Performances on the Yaw Elastic Restriction Vehicle System
Authors: Wang Guo Ye , Zhang Lu , Chen Guo Yan , Zhang Zhong Fu
Published: November 2012

Project the structure of the yaw elastic restriction vehicle system, and set up the system dynamic model. Establish yaw elastic restriction vehicle dynamics simulation system based on Matlab/Simulink aimed at Chery A3 sedan. Adopting the brake driving integration ESP control strategy, analyze and verify the stability control performance of independent vehicle systems and yaw elastic restriction vehicle system respectively in neutral steer, understeer and oversteer three test conditions. The results of the study show that the stability control performance of yaw elastic restriction vehicle system and independent vehicle systems has remarkable consistency. This provides a basis for vehicle driving stability control test.
Comparison of One-Unit Ball-Rod-Spring Balancer with Traditional Ball-Type Automatic Balancer
Authors: Wang Ming Cheng , Lu Chung Jen
Published: November 2012

Ball-type automatic balancers have been applied successfully to suppress unbalance vibrations of a rotor. A traditional ball-type automatic balancer consists of several balls moving along a fixed circular orbit. A new type of balancer, the ball-rod-spring balancer, in which the ball may move in the radial direction as well as in circumferential direction, has been proposed. This study aims to compare the performance of the new type of balancer with the traditional ball-type auto-balancer.
Calculation and Analysis of the Forces Created by Halbach Permanent-Magnet Electrodynamic Suspension
Authors: Chen Yin , Zhang Kun Lun
Published: November 2012

This paper researches on the levitation and drag forces of Halbach permanent-magnet electrodynamic suspension. First, construct an analytical model to calculate the magnetic field in the air gap and the current in the secondary conductor plate, thus deducing analytical expressions of the levitation and drag forces. Second, establish a 2D and a 3D finite element model, using ANSYS. Finally, at different speeds, from 0 to 250 km/h, compare the forces calculating results through the above three methods. Results generating from the 2D-FEM and the analytical algorithm have less than 3% of relative error, but for having not taken the horizontal components of eddy current in the reaction plate into consideration, thus 10% more than the 3D-FEM calculating results.
The Effects Research of Elastic Coupling on Torsional Vibration Test-Bed
Authors: Wu Fei , Liu Huan , Zeng Bing
Published: November 2012

The powertrain of vehicle is actually a multi-freedom torsional vibration system, its torsional vibration directly affect the vehicle’ ride comfort and safety. In this paper, the effects of elastic couplings on the newly built torsional vibration test-bed were researched. Firstly, using the basic principle of equivalent conversion, established the torsional vibration equivalent model. Secondly, analyzed the free torsional vibration of the powertrain by the dynamics analysis software-ADAMS and obtained the torsional vibration characteristic of the powertrain with different elastic couplings. Finally，fitted out the curve of stiffness and natural frequency by the least squares method.
Optimization Design for Crank Arc Guide Bar Gathering Mechanism of Crab Claw Type Loading Machine
Authors: Luo Zhong Hua , Li She Huan
Published: November 2012

This paper conducts a comprehensive study on the optimization design for crank arc guide bar gathering mechanism of crab claw type loading machine. The optimization aim is to make reality locus of gathering claw end-point be as in-accordance as possible with ideal locus, and so on. Formulae are derived for displacement of gathering claw end-point and position angle of the gathering claw. An optimization design model is established for the crank arc guide bar gathering mechanism. The crank arc guide bar gathering mechanism is optimized of crab claw type loading machine with 2100 mm wide, and the optimization result is satisfactory. Compared to the optimized crank straight line guide bar gathering mechanism in literature [2], the locus error function of gathering claw end-point has been largely improved with a reduction of 25.8%.
Hot Compression Simulation of Ti75 Alloy Based on DEFORM-3D
Authors: Fan Jun
Published: November 2012

To obtain the know-how of the deficiency for the filling capability, taking Ti75 alloy as the research object, at the same height of reducing, strain rates during forming as the control objective, the finite element numerical simulation method was used to simulate the hot compression with DEFORM-3D, analyzing the effect of the strain rates on the distribution of strain and stress.
Kinematics and Dynamics Analysis of Planar 3-RRR Parallel Robots
Authors: Zhang Qing Hua , Zhang Xian Min
Published: November 2012

Kinematics and dynamics of planar 3-RRR parallel robots are presented. Firstly, kinematic equations of planar 3-RRR parallel robots are given. Then, dynamic model of the system based on Lagrange equations is obtained. Finally, the change of the drive torque and energy consumption of active joints are analyzed under the different trajectories and different loads of the moving platform is given, the results showed that the mass and trajectory of the moving platform have a critical influence on drive torque and energy consumption of the active joint. These are very important for the optimum design of the manipulator and the excellent design of the dynamic controller.
Development of High Precision Position Stage and its Performance
Authors: Pan Gong Yu
Published: November 2012

This paper presents a high precision position stage which has the movement range of 0.4 micrometer and 1 nanometer precision. The piezoelectric actuator stage is composed of vertical position control part and horizontal position control part. With the three vertical piezoelectric actuators and three horizontal piezoelectric actuators, the stage can adjust the position in three directions and three angles around. The simulation and experimental results show that the first natural frequencies of the stage in three directions are bigger than 400Hz with the 600kg load, which means that the system are very strong to satisfy the stiff requirement. To evaluate the performance of the precision stage, vertical and horizontal movement and resolution are experimented with capacitance type displacement sensor whose sensitivity is 0.1V/um. The results show the stage can satisfy the design requirement.
Alloying Element Nb Effect on Microstructure of Co-Al-W Superalloy by Vacuum Arc Melting
Authors: Xu Yang Tao , Xia Tian Dong , Zhao Wen Jun , Wang Xiao Jun
Published: November 2012

Co-Al-W supperalloy used pure element powder, according to the ratio of different atomic percentage composition to make ingredients. It is mixed by planetary ball mill, pressed into blocks after the melting shape. Vacuum arc melting process was prepared by melting, after grinding, polishing, and after a volume of 5% perchloric acid and 95% of the electrolytic etcheing solution prepared in ethanol corrosion observed after analysis of the microstructure and phase composition by XRD analysis .It can be found that Co-Al-W superalloys were mainly composed of cobalt-rich matrix of austenite precipitation of γ phase and coherent with matrix of the L12 structure of γ′-Co3(Al,W) phase. In addition, Nb have effect on grain refinement and refine grain. Rockwell hardness test and analysis, It can be found that Nb can clearly improve the Co-Al-W superalloy hardness.
Study on Efficiency Characteristic of Torque Convertor Transmission System Based on Power Split Principle
Authors: Li Lin , Li Wei
Published: November 2012

High-power pumps and fans consume much energy in operation. Speed control of them is a major energy-saving way, and it has become a hot topic for research especially in power split speed control field. As the most widely used speed control method, fluid coupling has disadvantage in efficiency which leads to much energy losses. In article, a power split speed control system using torque convertor as speed adjust element is proposed due to practical need of reducing losses. The efficiency characteristic of it is discussed by comparative analysis with other methods and promotion of the system efficiency is demonstrated as well.
Shear Ram Speed Characterization for Copper Wire Bond Shear Test
Authors: Sauli Z. , Retnasamy V. , Shapri A. H. M. , Rahman N. A. Z. , Norhaimi W.M.W. , Taniselass S. , Aziz M. H. A.
Published: November 2012

This paper presents the evaluation of the stress and strain response of the copper ball bond during wire bond shear test using finite element analysis. A 3D non-linear finite element model was developed for the simulation. The effects of the shear ram speed on the stress and strain response of the copper ball bond were investigated. A preliminary investigation confirms that shear ram speed has a significant effect on the von mises stress and equivalent strain response of the copper ball bond during wire bond shear test
Defective Casting Diagnosing via an Enhanced Knowledge Hyper-Surface Method
Authors: Mohd Nawi Nazri , Harun Zawati , Wahid Noorhaniza
Published: November 2012

The research on the analysis of cause and effect relationships in castings has always been a centre of attention in the manufacturing industry. An intelligent diagnosis system should be able to diagnose effectively the causal representation and also justify its diagnosis. Recently, a method, known as the Knowledge Hyper-surface method which used Lagrange Interpolation polynomials has gained more popularity in learning cause and effect analysis in casting processes. The current method show that the belief value of the occurrence of cause with respect to the change in the belief value in the occurrence of effect can be modelled by linear, quadratic or cubic relationships and the method retained the advantages of neural networks and overcomes their limitations in learning the input-output mapping function in the presence of noisy, limited and sparse data. However, the methodology was unable to model exponential increase/decrease in belief values in cause and effect relationships. This paper proposed an enhancement to the current Knowledge Hyper-surface method by introducing midpoints in the existing shape formulation which further constrains the shape of the Knowledge hyper-surfaces to model an exponential rise in belief values but without exposing the dataset to the limitations of ‘over fitting’. The ability of the proposed method to capture the exponential change in the belief variation of the cause when the belief in the effect is at its minimum is compared to the current method on real casting data.
Transient Electromagnetic Field Numerical Analysis of Self-Excited Retarder
Authors: Yang Xiao Jun , He Ren , Wang Fan , Feng Yi Zeng
Published: November 2012

Power generation performance of a self-excited retarder determines whether the design goal of its braking torque could be achieved. The numerical analysis of transient electromagnetic field took magnetic vector potential as variable and made six reasonable assumptions to simplify calculation. Based on above, definite solution about transient electromagnetic field and the finite element received a detailed description. The external circuit and end effect of the power generation unit were taken into account so as to improve the calculation accuracy. Let the finite element equation and external circuit equation combine to form field-circuit coupled equations and then using Crank Nicolson method established its space-time discrete model. After verification by experiment, theoretical performance of the power generation unit was basically consistent to the experimental result for a 500Nm prototype. This showed that the numerical analysis as well as the model was feasible and the power generation unit could satisfy the requirement of braking unit for excitation current.
Electric Vehicle Charging Station Load Forecasting and Impact of the Load Curve
Authors: Wang Jian , Wu Kui Hua , Wang Feng , Li Zhi Hui , Niu Qing Song , Liu Zhi Zhen
Published: November 2012

With the popularity of electric vehicles, a large number of charging stations connected to the grid, will bring about tremendous influence on the power, voltage and current of grid. This paper briefly introduces several common types of charging mode, and analyzes the characteristics of them. According to statistics, a resistive model of charging stations, simulating the regional power grid with a IEEE34 node model, has been established to forecast the daily load curve, using Monte Carlo simulation. An analysis is performed for a power grid to demonstrate the impacts of the daily load curve considering different power of charging stations, which are under coordinated charging conditions, to indicate the harm of uncoordinated charging and put forward solutions.
The Impact of Electric Vehicles Fast Charging on the Grid Voltage and Current Fluctuations
Authors: Li Zhi Hui , Jian Qing Zhi , Chen Hang , Du Xue Long , Liu Zhi Zhen
Published: November 2012

As the energy crisis becoming more and more serious, electric vehicles has become an important way to solve this problem. The difference of Popularity, type, charge time, charge style and charge characteristics of Electric vehicles make different effect on the Regional power grid, especially quick charge technology. In this paper, through the establishment of regional power grid model and the forecast of quick charge station load curve, we analysis the impact of charge station on voltage of the user side, furthermore, we analysis voltage loss and impulse current when the large power charger connected to the power grid, and verify the analysis by simulation. In order to reduce the impact on the grid, we should rationally plan the charge station and the reactive power compensation, thus enhance stability of power system.
Generation Oscillating Switching Impulse Using Power Transformer
Authors: Wu Xu Tao , Ding Pei , Guo Fei , Liang Jian Feng , Li Jun Hao , Li Yan Ming
Published: November 2012

According to IEC60060-1, IEC60060-2 requirements, on-site tests for the high voltage apparatus can not be achieved due to many external factors such as the huge impulse voltage source and external electrical and magnetic fields, weather condition, etc. Therefore, IEC60060-3 points out the impulse waveforms for the high voltage apparatus during on-site tests, one of the impulse waveforms is the oscillating switching impulse, but the oscillating switching impulse source with high amplitude is a bulky test equipment which is not suitable for the on-site test, consequently the demands for portable oscillating switching impulse source is urgent. This paper presents that the high oscillating switching impulse voltage can be generated by a low oscillating switching impulse voltage with the power transformer which is the test object, the simulation and experiment results show this method can be used for the power transformer during oscillating switching impulse on-site test.
Smart Surveillance System Detection Using PCA- Based Feature Extraction
Authors: Junoh Ahmad Kadri , Mansor Muhammad Naufal , Abu Mohd Shafarudy , Ahmad Wan Zuki Azman Wan , Jaafar Wan Nur Hadani Wan , Mukhtar Azhan Zamire , Fauzi Siti Fazlina , Ismail Siti Haida
Published: November 2012

Perception of vision and motion is a vast interdisciplinary field combining psychology, neurology, physiology, mathematics, computer science, physics, philosophy and more. The issue of the actual mechanism for the visual and computational perception of motion in the human are keep grow for the last decade. Each of the researchers is keep pursuit to find the ideal potion of a robust recognition and detection for video system. Clutches by illumination and pose variations, several compensation techniques were proposed to overcome these issues. However, were successful for face recognition in partly lightened faces and not for facial expression recognition (FER). Attempts were made to implement FER. However these were not focused for intruder face recognition/monitoring. They lack the region of interest (ROI, in this case face detection) while processing, which is crucial for environment such as in a car (a possibility of another person behind/beside the driver). Thus, an Automated Video Surveillance system is presented in this paper. The system aims at tracking an object in motion and classifying it as a human or non-human entity, which would help in subsequent human activity analysis based on PCA based feature extraction.
Comparative Study of Mechanical Properties of Bone Tissue Based on the CT and the µCT Slices
Authors: Prášilová Eva , Marcián Petr , Krpalek David , Řehák Kamil , Malina Radomír , Konečná Veronika
Published: November 2012

This article deals with presentation of data processing obtained from imaging CT (computer tomography) and micro CT devices. These methods enable to perform bone tissue density analysis by non-invasive way. The image processing methods, by which it is possible to determine mechanical properties of bone tissue, are described in this paper. Further, a creation of a computational model with different bone density of cancellous tissue is described and afterwards the stress strain analysis is performed. The mandible segments with different bone density were used as samples. Results show significantly higher stresses are reached in a cancellous bone tissue with worse bone quality.
Design and Development of an Integrated Flight Planning and Rehearsal System Based on GIS and Navigation Database
Authors: Li Da Chuan , Cheng Nong , Cheng Peng , Song Jing Yan
Published: November 2012

In modern civil aviation operations, the effective performance of pre-flight flight planning is the key of a safe flight, and the changing air traffic environment often requires modifying the pre-determined flight plan or even en route re-planning. This paper proposes an integrated system framework for the construction, re-planning, rehearsal and evaluation of computerized flight plans (CFP): the flight plan management and rehearsal system (FMRS). It provides interactive, graphic user interface - based ways of constructing flight routes using the navigation database and geographic information system (GIS), and the CFP parameters can be calculated automatically based on real performance data of various types of aircrafts. Simulation models of aircraft dynamics and airborne subsystems including the automatic flight control, navigation sensors and cockpit instruments are also integrated to support the rehearsal and evaluation of flight plans, and assist in analyzing en-route re-planning operations. All subsystems and components are integrated into an overall platform which is based on an inter-communication architecture and can be implemented on either centralized or distributed simulation platforms. Simulation and system evaluation results obtained from actual commercial flight routes demonstrate that the proposed system can effectively facilitate the preparation and evaluation of CFPs, and support the CFP re-planning decision-making process and operations.
Nonlinear Hierarchy-Structured Predictive Control System Design for Hypersonic Flight Vehicle
Authors: Wang Peng , Liu Lu Hua , Wu Jie
Published: November 2012

A hierarchy-structured predictive control(HSPC) method is proposed according to the feature that hypersonic flight vehicle(HFV) model is highly nonlinear, fast-variability, coupling, and with parameters of great uncertainties. This method contains two parts, which are inner-loop nonlinear generable predictive control(NGPC) system and outer-loop NGPC system, respectively. These two NGPC systems are both designed by closed-form optimal generable predictive control(GPC) method. The HSPC system can ensure the longitudinal flight stability under the influence of uncertain parameters. Simulation studies demonstrate that the proposed control method is feasible for hypersonic flight vehicle.
Experimental Investigation on Supersonic Jet Screech Tones
Authors: Li Jia Ming , Hu Chun Bo , Bai Jun Hua
Published: November 2012

In order to investigate the characteristic of the supersonic jet screech tones, an experimental bench of the supersonic jet was designed and a free field noise signal acquisition system was established. Effects of the nozzle size and jet Mach number on jet noise sound field distribution was analyzed, through the result comparison of supersonic jet noise experimental measurement. Results indicate that the field distribution of supersonic jet screech tones is characterized with very strong directivity. Peak value of the screech tones decrease and occurrence frequency of the screech tones increase with the decreasing jet exit Mach number; occurrence frequency of the screech tones decrease with the increasing nozzle size, but the peak value change very less. The experimental measurement of supersonic jet noise provides mechanism research of sound production with data supports and references; and also provides the numerical modeling of supersonic jet noise with validation criteria.
Effect of Wind Directions on the Thermal Performance of Three Aligned NDDCT: Parallel and Perpendicular Directions
Authors: Ghafarigousheh Samad , Golneshan Ali Akbar
Published: November 2012

In this paper a 3-D numerical model is used to investigate the thermal performance of a three aligned unit of NDDCT under crosswind condition. The computed results show that, there are major differences in computed velocity patterns and pressure fields around the cooling tower due to neighboring of a number of cooling towers will result considerable changes in computed flow parameters hence; the thermal performance losses for the single tower under crosswind are superior to those when this towers are incorporated in aligned arrangement. Results also show that the best thermal performance of the three aligned NDDCT is achieved when the crosswind is directed along the towers connection line.
Estimation of Skin Friction Drag on a Model in Hypersonic Shock Tunnel
Authors: Sura J. , Menezes V. , Kirthyvasan A. , Kulkarni V.
Published: November 2012

Viscous drag on the internal surfaces of a notional scramjet engine model has been estimated through Reynolds analogy, using measured wall heat transfer rates, in a shock tunnel at a hypersonic Mach number of 8. The study has been carried out without fuel injection and at zero degree angle of incidence of the model with the freestream. The heat transfer rate measurements were carried out on the upper and lower internal surfaces of the engine employing fast response E-type thermocouples. Application of Reynolds analogy to the wall heat transfer rates yielded the skin friction coefficient, through which the viscous drag on the surfaces could be determined. The measurements predict the salient features of the flow field of the model and are a novel reference on the data to the researchers working in the area of slender-body, hypersonic aerothermodynamics.
Numerical Investigation of Hypersonic Double-Cone Flow
Authors: Kong Wei Xuan , Zhao Rui , Yu Jian , Yan Chao
Published: November 2012

Hypersonic flow of Mach number 8 past a 25°-50° double cone geometry is numerically simulated at ReD=4.8E5. Complicated flow structures, including Type V shock-shock interaction, shock-boundary layer interaction, separation and reattachment at the corner are presented and discussed. The surface pressure and heat transfer rate distributions are also calculated and compared with the experimental data. Results show that both the 2nd order MUSCL and 5th order WENO could accurately reproduce the shock structures, while the higher order scheme could predict a more accurate size of separation zone. Generally, the size of the separation zone is underestimated with an overvalued pressure distribution after reattachment employing the full turbulent models. On the other hand, transition induced by the reattachment shock has been calculated using transition model and the results of pressure peak and the size of separation zone show good agreement with the experimental measurements.
Layer Thickness Variation in Two-Phase Flow of a Third Grade Fluid
Authors: Mitkova Maya K. , Siddiqui Abdul M. , Ansari Ali R.
Published: November 2012

In this paper we consider the two-layer flow of a third grade fluid between two horizontal infinite parallel plates. The fluid in both layers is pressure driven in a horizontal direction (Poiseuille flow). We relax the assumption of symmetry and consider layers of variable thickness. To solve the non-linear differential equations describing the motion of a third grade fluid we use the Homotopy Analysis Method and provide a solution which accurate up to the second order. We apply this solution to attain the velocity profile in different cases for different layer thickness, pressure gradient and material constants that describe the non-Newtonian behavior of the fluid.
The Characteristic Features of Composite Materials Specimen’s Static Fracture Investigated by the Acoustic Emission Method
Authors: Urbahs Alexanders , Banov Mukharbiy , Turko Vladislav , Tsaryova Kristine
Published: November 2012

The work is dedicated to the experimental study of micromechanics process of unidirectional composite materials’ specimens under static loading till its fracture using acoustic emission method compared with the strain-load deformation curve. An attempt is made to identify subtle effects of the failure process of the composite material which is impossible using the traditional methods of the strain measurement. The prospect of applying the method of acoustic emission (AE) for the development and improvement of existing methods of model tense- analysis is shown. The characteristic stages of the damage accumulation for unidirectional composites’ specimens and the effect of training on these processes are shown experimentally. It’s shown that the AE-deformation diagram have three stages in contrast to commonly used load-strain deformation curve with one stage. So it become possible to investigate the physical process of composite unit’s fracture under static load.
Theoretical and Experimental Study on Oil-Water Two-Phase Flow in a Downhole Venturi Meter
Authors: Huang Si , Wang Peng , Guan Yu Hui
Published: November 2012

This paper presents a study on an oil-water two-phase flow model in a downhole Venturi meter by theoretical calculation, numerical simulation and experimental testing. The flow field and pressure characteristics with different flow and oil-water ratios in Venturi tube are investigated. It is found that the flow is stratified in the Venturi tube, the water phase accumulates in the tube center and the oil phase concentrates on the wall; the pressure drop is increased with flow; theoretical and numerical results are verified by experimental data.
Effect of Process Parameters on Defect Formation in Friction Stir Processed 6082-T6 Aluminium Alloy
Authors: Akinlabi Esther Titilayo , Akinlabi Stephen A.
Published: November 2012

This paper reports the effects of processing parameters on defects formed during friction stir processing of 6082-T6 Aluminium Alloy. The plates were processed by varying the feed rate between 50 and 250 mm/min, while the rotational speed was varied between 1500 and 3500 rpm to achieve the best result. It was observed that the sheets processed at the highest feed rate considered in this research resulted in wormhole defect. These processed samples with defects were correlated to the tensile results and it was found that the Ultimate Tensile Strength (UTS) of these samples was relatively low compared to other samples without defects.
Mesoporous Activated Carbon Prepared from Bamboo by One-Step CO2 Activation Used for Puerarin Separation
Authors: Guo Jia , Guan Yu Qiong , Wang Xing , Sun Chao , Luo Ye
Published: November 2012

The feasibility of preparing mesoporous activated carbons from bamboo, a fast growing plant in some Asian countries, particularly in China, was investigated. The effects of activation conditions, namely, activation temperature and retention time, on the characteristics of the activated carbons, i.e., specific surface area, pore size distribution and surface chemistry, were studied. The separation performance for Puerarin using the prepared bamboo activated carbon was compared to other adsorbents which included a commercial activated carbon and a macroporous resin. The experimental results showed that it was feasible to prepare mesoporous activated carbon from bamboo and to use it instead of the expensive resins presently used for Puerarin separation.
Fault Diagnosis Method Based on Integration Signed Directed Graph with Quantitative Knowledge
Authors: Yan Zheng , Peng Xiao Hui , Cheng Yu Qiang , Wu Jian Jun
Published: November 2012

Signed Directed Graph (SDG) has been widely applied to model the cause and effect behavior of process systems in recent years. However, SDG-based diagnosis has poorly discriminatory ability, because of the information loss while going from quantitative to qualitative domain. In this paper, a new method combining SDG with quantitative knowledge is presented to improve the discriminatory ability. In the method, a hybrid reasoning (forward and backward) strategy based on assumption and verification was applied to find all the potential fault sources and corresponding consistent paths in SDG model. Then the SDG-based method was modified by integrating governing equation and temporal information of the system, in order to improve the discriminatory ability. The method has been validated by the artificial telemetry data, and the effectiveness of the method has been confirmed. The method proposed can provide important practical value for the development of on-board fault diagnosis system of spacecraft propulsion systems.
A Kinematic Model for Volumetric Error Estimation of a Special Purpose CNC Machine
Authors: Simpson M. , Gorlach I.A.
Published: November 2012

This research reports on error identification and compensation of a special purpose CNC machine. The kinematic model of the machine was developed using rigid body kinematics and small angle approximation of the axes of the machine through homogenous transform matrices, and the equations describing the volumetric errors. The machine was calibrated to measure the axes errors, which were used in the kinematic model in order to determine compensation values. The model was evaluated by means of direct measurements of axis movements using a laser interferometer, as well as in cutting tests, where a large number of holes were drilled in plates and measured with a CMM. The results showed that the developed model achieved an average error reduction of 40%, for the X and Y axes.
Experimental Study of Non-Contact Robot Gripper for Food Industries
Authors: Elango N. , Obianuju Onubogu Nneka , Ragunathan S.
Published: November 2012

A new gripping principle, based on Coanda effect was applied successfully in designing and developing a non contact robot gripper to curb the gripping challenges faced in the food industries. Two designs of the non contact grippers/ejectors which are working on Coanda effect are presented in this paper. The first design was made with one suction head while the second design was made with multiple suction heads. Experiments were carried out on both ejectors to observe their holding force on food materials as a function of mainly the pressure, flow of the primary air and other parameters. Tangible results were derived from the experiments, tabulated and shown in graphical forms; from which relationships between the parameters were derived. When tested on thick bark/packed food materials, they left no suction marks on them.
Overall Mechanical Properties of Particulate Porous Composites Following Two-Step Homogenization Scheme
Authors: Barboura Salma , Ramtani Salah
Published: November 2012

The present work tries to make an attempt to improve previous work which offers a simple but effective way to construct satisfied predicating model. Indeed, recent work due to Peng et al. [13] and dealing with a two-step homogenization scheme is revisited here by introducing an iterative process which allows us to take into account differently the porosity of the elastic media. Several homogenization schemes (dilute, Mori-Tanaka, self-consistent ...) are presented and compared with experimental data. One can say that the current approach provides reasonably accurate predictions for the effective moduli of multiphase composites without using the n parameter as proposed by Peng et al. [13]
The Study of the Effect of the Blade’s Aspect Ratio and Thickness on Rotating Vibration
Authors: Li Hong Wei , Xie Zhen Bo , Jia Ming Ming
Published: November 2012

Study the effect of the blade’s aspect ratio and thickness on rotating vibration according as modulating frequency can reduce the resonance vibration of the blades. Research the modal analysis of the blades of the aero-engine. Apply the software of a finite element method (FEM) to simplify calculating process. Establish three finite element models of the blade. Calculate and analyze the natural frequency and mode of each blade. Analyze the local resonance which is caused by the wake flow exciting force in the different conditions of the engine. The structure of the blades should be right for the engine conditions which make the vibration frequency of the blades out of the resonance vibration scope.
Simulating the Granular Materials Flow in Rotary Kilns
Authors: Khamesi Seyed Sina , Kavandi Pouria , Mohammadi Maryam
Published: November 2012

Granular materials flow is discussed by different models. These models are 2D and each of them includes some special effects of two phase flow. For simulating the 3D flow of granular materials in rotary kilns, a model based on finite volume method (FVM) is presented which includes axial and rotational motion and also all of the effects of two phase flow such as: viscosity effect, particle size, rotating velocity of kiln, kiln tilt, etc. This method is used according to a real kind of rotary kiln and hypothetical clogging inside of kiln. The simulation results in both 2D and 3D views are presented in this article. These results are compared with Kramer’s model and they are acceptable. Also in this simulation, granular flow over the clogging is reviewed by using hypothetical clogging in the rotary cement kiln.
Computational Simulation of Small Punch Test
Authors: Petruška Jindřich , Hůlka Jiří , Petr Kubik
Published: November 2012

The paper deals with numerical simulation of Small Punch Test (SPT). SPT is a penetration test used to determine basic mechanical properties from a tiny piece of material. The testing procedure drew a great interest in the last decade, nevertheless there are no generally accepted standards for this type of testing until now. “Code of Practice” was created as a consequence of the CEN Workshop 2007, recommending both geometry, experiment performance and its basic evaluation. To obtain other mechanical properties like flow curve, yield stress, ductility and ultimate strength, it is necessary to realize a numerical simulation of the test to identify the mentioned material parameters. As the SPT results are generally influenced by many other parameters besides material behaviour, we try to quantify their relevance to make the material identification more rigorous.
The Constant Pressure Gas Supply Control System and Characteristic Simulation to Air Compressors Based on Fuzzy Self-Tuning of PID Parameters
Authors: Wang Hui , Wang Hai Jian
Published: November 2012

In the light of the problems that mine air compressor’s exhaust pressure instability, large energy consumption in the work process, more waste and so on, the system used PLC as the developing platform of the hardware, using fuzzy PID parameters self-tuning method to control the air compressors, make it possibly that air compressors’ main motor variable frequency speed regulation, ensure air compressors supply air stability, using Matlab/Simulink software to model and simulate and analysis for the control system at the same time, through the field test and the simulation results show that, this system not only improved the automation degree of the air compressors’ system, but also the obviously voltage stabilizing and energy saving effect, it has a greatly applied prospect and practical value.
ADAMS/MATLAB Co-Simulation: Dynamic Systems Analysis and Control Tool
Authors: Ángel L. , Pérez M.P. , Díaz-Quintero C. , Mendoza C.
Published: November 2012

In this paper a dynamic simulation methodology of systems is presented by using ADAMS/MATLAB co-simulation. This methodology allows simulation, development and validation of different control strategiesfor robotic manipulator models in a fast way. It provides a first stage into the design of robotic prototypes for researchers and professionals. Finally, the methodology was validated by constructing a simulation model of a double pendulum and by implementing a PD type control strategy.
Developing a Dynamic Model for Unmanned Aerial Vehicle Motion on Ground during Takeoff Phase
Authors: Essuri M. , Alkurmaji K. , Ghmmam A.
Published: November 2012

Modeling of take-off and landing motion for a fixed wing (UAV) is necessary for developing an automatic take off and landing control system (ATOL). Automatic take off and landing system becomes an important system due to wide spread of unmanned aerial vehicles in different applications ranging from intelligence, surveillance, up to missile firing. Automatic take off and landing system reduces damage to an unmanned aerial vehicle and its payload that may be caused by human pilot errors. Furthermore, training human pilot to a sufficient level of skill and experience for takeoff and landing may take several years and significant cost. A human pilot also may impose additional restrictions for UAV operation especially at night time or dusty desert conditions. Although, ATOL adds complexity to the system, it reduces the long run cost and risk caused by takeoff and landing process, and makes UAV takeoff from different runways and at different atmospheric conditions. A mathematical model for takeoff is successfully developed for a small fixed wing UAV. A Matlab/Simulink simulation model is prepared for the ground roll phase, and some simulation results are also shown.
Surface Quality and Dust Analysis in High Speed Trimming of CFRP
Authors: Haddad Madjid , Zitoune Redouane , Eyma Florent , Castanié Bruno , Bougherara Habiba
Published: November 2012

In this work, high speed trimming of a multi directional carbon fiber reinforced plastic using a tungsten carbide burr tool is studied. The influence of the machining parameters on both the dust size and surface quality is investigated. A high percentage of dust is found under the theoretical chip size and the surface quality is found to be affected by the cutting parameters. The percentage of inhaled dust reaching the pulmonary alveoli is quantified and found to be very high, it is also found that this percentage is affected by the cutting conditions.
The State of the Art in Energy Consumption Model – The Key to Sustainable Machining
Authors: Tao Peng , Xun Xu
Published: November 2012

Development of reliable energy consumption models is the essential step toward sustainable machining. Due to the complex relationship between energy consumption and a large number of contributing factors, obtaining an accurate model is very difficult, if not impossible. This paper aims to review the literature in this field over the last two decades. The research work on energy models is grouped into three categories, i.e. theoretical, experimental and discrete event-based models. It is found that machine tool structure, set-up conditions, and machining parameters have major impacts on energy consumption, suggesting that energy consumption models need to be constructed not only at the process level but also at the system level. Hybrid models that combine more than one approach are considered an option.
Thermoeconomic Approach and Optimization of a Solar Thermal Power Plant
Authors: Baghernejad Ali , Yaghoubi Mahmood
Published: November 2012

In the present study, a specific and simple second law based exergoeconomic model with instant access to the production costs is introduced. The model is generalized for a case study of Shiraz solar thermal power plant with parabolic collectors for nominal power supply of 500 kW. Its applications include the evaluation of utility costs such as products or supplies of production plant, the energy costs between process operations of an energy converter such as production of an industry. Also attempt is made to minimize objective function including investment cost of the equipments and cost of exergy destruction for finding optimum operating condition for such plant.
Elastic and Plastic Stress Analysis of Composite Beams under Distributed Load
Authors: Saber Azad Mohammed Ali
Published: November 2012

An analytical elastic-plastic stress analysis is carried out on metal-matrix composite beams of arbitrary orientation, supported from two ends under a transverse uniformly distributed load. The composite layer consists of stainless steel fiber and aluminum matrix. The material is assumed to be perfectly plastic during the elastic–plastic solution. The intensity of the uniform force is chosen at a small value; therefore, the normal stress component is neglected in the elastic-plastic solution. The expansion of the plastic region and plastic stress component of σx are determined for orientation angles of 0, 30, 45, 60 and 90o. Plastic yielding occurs for 0 o and 90 o orientation angles on the lower and upper surfaces of the beam at the same distances from the mid-point. However, it starts first at the lower surface for 30, 45 and 60 o orientation angles.