bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Study on Reinforced Concrete Beam and Composite Column Joint with Square Steel Cage
Authors: Aravind Raj Ponsubbiah S. , Joanna Philip Saratha
Published: August 2014

For the optimum performance of the structural members, the joint of the beam and column has a significant role. This paper presents the behavior of encased steel column and reinforced concrete beam with an improved connection system. In this connection, the steel tube which interrupts the longitudinal reinforcement in the beam is made continuous in the joint zone. This is done by providing square steel cage inside the concrete casing at the joint. This system is easier for casting and tube filling when compared to the conventional method of in-situ welding and hole-drilling. Experiments were conducted on eight specimens with two specimens in each series which included four control specimens. Number of tiers and the number of concentric rings were the variables among the specimens. The specimens were tested under a constant axial load and reversed lateral loading. Experimental results indicate a significant increase in the lateral strength capacity and ductility ratio of the beam-column when the joint is provided with the square steel cage inside the concrete casing.
A Modified Single Phase H-Bridge Inverter for High Power Applications with Power Quality Improvement
Authors: Suresh S. , Kannan S. , Sundaravel S. Ponnayira
Published: August 2014

Various multilevel inverter topologies are widely being used for real power exchange, reactive power compensation, harmonic current mitigation on grid and industrial drive applications with fundamental frequency switching mode of gate control. Still so many topologies are being currently developed with reduced number of switches, improved waveform for power quality improvement with fundamental frequency switching and pwm switching gate control mode. This paper presents the performance analysis of modified H-bridge single phase inverter for high voltage and high power applications. The switching method has been selected to operate the inverter at fundamental frequency switching mode of gate control to be free from lower order harmonics. The inverter has the modulation technique with pre calculated switching angles to generate the required fundamental voltage with reduced Total Harmonic Distortion (THD). So, the switching losses have been reduced hence the efficiency is improved with Power Quality (PQ) improvement in voltage-current waveform. The DC input power is feed to the inverter from DC capacitor voltage divider source, contributed to give various dc voltage levels during fundamental frequency switching of different switching combinations for the generation of stepping output voltage. During dynamic load condition, the magnitude of input dc voltage level across each capacitor has not undergone through big swing to feed the power to the load without affecting generated output ac voltage. The performance of the proposed inverter has been analyzed for dynamic reactive load and induction motor. The MATLAB based simulations have been presented to validate the inverter operation for dynamic reactive load and industrial drive applications with pre calculated THD reduced switching conduction angles for PQ improvement in waveform.
Soft Computing Techniques for Identification of an Asynchronous Machine Parameters
Authors: Sridevi R. , Kumar C. , Iswarya N. , Gopikaramanan R.
Published: August 2014

This manuscript discusses about the Parameter estimation of Induction motor by utilizing the soft computing methodologies that is by using evolutionary algorithms such as Genetic algorithm, Particle swarm optimization, Artificial immune algorithm to overcome the difficulties in the conventional method where we calculating the per phase equivalent circuit parameters from the No load test and Blocked rotor test which compromises in result in terms of accuracy of the result and also evaluated the accuracy of the different algorithm in estimating the parameters of the induction motor.
PSO Tuned PID-Based Model Reference Adaptive Controller for Coupled Tank System
Authors: Auxillia D. Jeraldin , Anitta T.
Published: August 2014

In process industries control of nonlinear processes like level process is a common problem. For these nonlinear processes, to have a good performance even in the presence of environmental changes, the controller must have the ability to adopt changes in plant dynamics. So a Model Reference Adaptive Control (MRAC) based on PID controller is designed. Main objective of this work is to design PID-MRAC to include adaptiveness and to give good steady-state and transient performance for coupled tank system both with interaction and without interaction. A Particle Swarm Optimization (PSO) algorithm is used to fine tune the PID controller parameters. Simulations are done to show the effective performance of PID-MRAC compared to simple MRAC applied to couple tank system.
Generation Unit Capacity Expansion Planning Analysis: Approach Using Real Coded Improved Genetic Algorithm
Authors: Ahila M. Jeraldin , Jawhar S. Joseph , Singh N. Albert
Published: August 2014

This paper provides information about the development of an algorithm called Real Coded Improved Genetic Algorithm (RCIGA). And it leads to a plan for generating units of power with minimum cost and that plan is called as Generation Unit Expansion Planning (GUEP) problem. GUEP is a fully forced non linear system. And this can be solved by technique called genetic algorithm. RCIGA helps in providing faster speed and the space which helps in searching also is increased. RCIGA helps in calculating the combination of units through which the minimum cost can be obtained and units of power should meet out the conditions of the forecasted demands.
A Novel Design of UPQC with Kalman Filter for Mitigation of Voltage and Current Disturbances
Authors: Williams A. Subanth , Malar R. Suja Mani
Published: August 2014

In this project proposed a new concept of optimal utilization of a unified power quality conditioner. The series inverter of the UPQC is controlled to perform simultaneous voltage sag/swell compensation and load reactive power sharing with the shunt inverter. Kalman filter is designed to remove the harmonic components of the supply voltage and load current. The proposed method operates both in the time and frequency domains allowing the selective compensation of voltage and current harmonics with fast dynamical responses. The simulation is conducted by using MATLAB/SIMULINK. The simulation result shows the proposed UPQC has a good effect in the mitigation of the voltage sag.
Fuzzy Logic Based Load Frequency Control of Two Area Power System in Deregulated Environment
Authors: Priyadarsini Ajitha S. , Mary P. Melba , Singh N. Albert
Published: August 2014

In this paper fuzzy logic based load frequency control (LFC) of two area power system in deregulated environment was studied. A two area system is considered in which all areas are interconnected by normal AC tie-lines. In the proposed system the effects of bilateral contracts between DISCOs and GENCOs are also considered. The performance of the fuzzy logic controller is tested on a deregulated two area load frequency control system for different operating conditions using MATLAB Simulink tool.
A Novel Compression Technique for Compound Images Using Parallel Lempel-Ziv-Welch Algorithm
Authors: King G.R. Gnana , Seldev C. Christopher , Singh N. Albert
Published: August 2014

Compound image is a combination of natural images, text, and graphics.This paper presents a compression technique for improving coding efficiency. The algorithm first decomposes the compound images by using 3 level biorthogonal wavelet transform and then the transformed image was further compressed by Parallel dictionary based LZW algorithm called PDLZW.In PDLZW algorithm instead of using a unique fixed word width dictionary a hierarchical variable word width dictionary set containing several dictionaries of small address space and increases the word widths used for compression and decompression algorithms. The experimental results show that the PSNR value is increased and the Mean Square error value was improved.
Intelligent Computer Aided Detection of Tumor in MRI Brain Images Using Cascaded Correlation Neural Network Classifier
Authors: Amsaveni V. , Singh N. Albert , Dheeba J.
Published: August 2014

In this paper, a Computer aided classification approach using Cascaded Correlation Neural Network for detection of brain tumor from MRI is proposed. Cascaded Correlation Neural Network is a nonlinear classifier which is formulated as a supervised learning problem and the classifier was applied to determine at each pixel location in the MRI if the tumor is present or not. Gabor texture features are taken from the image Region of interest (ROI). The extracted Gabor features from MRI is given as input to the proposed classifier. The method was applied to real time images from the collected from diagnostic centers. Based on the analysis the performance of the proposed cascaded correlation neural network classifier is superior when compared with other classification approaches.
Induction Motor Conditional Monitoring Using Wireless Sensor Network
Authors: Shoba P. , Arivuselvam B.
Published: August 2014

This system is used for monitoring the speed, torque, efficiency, voltage & current by employing ZigBee based wireless sensor network. Embedded system is used for acquiring electrical signals from the motors in a non-invasive way. The speed and torque estimation is done locally. An embedded system is used to control the speed of the motor the values calculated by the embedded system are transmitted to the monitoring unit through ZigBee based wireless sensor network and it can be monitored locally in PC. The main advantages of using ZigBee are low maintenance cost, security, reliability and through output. Using simulation, the characteristic graph for speed, torque, output voltage and output current can be obtained.
Surface Morphology and Deformation Mechanism of Single Crystal Copper Treated by Laser Shock Peening
Authors: Liu Yuan Xun , Wang Xi , Wu Xian Qian , Huang Chen Guang
Published: August 2014

To study the relation between surface morphology and deformation mechanism of the target material under the shock, a flexible boundary loading, in laser shock peening (LSP), the macroscopic and microscopic surface morphology of a single crystal copper treated by LSP was investigated. The optical profilometer shows a 200-μm-deep pit forms on the shocked surface under LSP. The optical microscopy shows a set of parallel slip bands appear at the center of the shocked region and many vertical cross slip bands appear at the edge of shocked region. This indicates a large plastic deformation occurs by means of slip for the single crystal copper under LSP and the distributing features of slip bands correspond to the spatial distribution of the shock pressure. The results confirm that the surface morphology of materials under LSP can reflect the deformation mechanism and it can be a new method of studying the deformation mechanism of materials under LSP.
Study on Water Cushion Belt Conveyor
Authors: Liu Xian Wei , Wang Jia Sheng , Wu Lan Tao , Zhang Xin , Cheng Hua
Published: August 2014

Based on air cushion belt conveyor, a new type of belt conveyor named water cushion belt conveyor is proposed. It has a wide scope of applications for its features such as stability and reliability, capability of full load start-up, and environment-friendliness. This paper studies the working mechanism and lubricating mechanism of the water cushion belt conveyor. The basic lubrication equation of the water cushion is deduced from the universal form of the Reynolds equation used to study the pressure film properties of the water cushion. The design of the key part of the water cushion device is described in details. The research can be taken as a reference in practical applications.
Comparison of Analytical Models of Force Prediction during Dynamic Bending Stage for 3-Roller Conical Bending Process
Authors: Chudasama Mahesh , Raval Harit K.
Published: August 2014

Conical bending process using three rollers with different configurations is a widely used process for manufacturing conical sections and shells in the industries. The process involves static as well dynamic stages. For optimum design of the machine, accurate analytical model of the force prediction is required for static as well dynamic bending stages. In this paper the analytical models considering three different stress conditions have been compared with the experimental results. The observations of the comparison have been reported. It is concluded that for higher bottom roller inclination, the shear stress has to be considered for evaluation of bending force whereas for lower bottom roller inclination it can be neglected.
Taguchi Optimization of Process Parameters in Friction Stir Spot Welding of AA5754 and AA2024 Alloys
Authors: Bozkurt Y. , Bilici Mustafa Kemal
Published: August 2014

The feasibility of friction stir spot welding was studied on AA5754-H22 and AA2024-T3 aluminum alloys which have widespread applications in aircraft and automotive industries. The quality of the joint was evaluated by examining the characteristics of the joint as a result of lap-shear fracture load. Taguchi approach of the parameter design was used as a statistical design of experiment technique to set the optimal welding parameters. The experiments were arranged by using Taguchi’s L9 orthogonal array. The signal-to-noise ratio and the analysis of variance were utilized to obtain the influence of the friction stir spot welding parameters on the lap-shear fracture load. Finally, the results were confirmed by further experiments.
A Simplified Finite Element Riveted Lap Joint Model in Structural Dynamic Analysis
Authors: Dourado Marco Daniel Malheiro , de Meireles José Filipe Bizarro
Published: August 2014

This paper proposes a simplified finite element model to represent a riveted lap joint in structural dynamic analysis field. The rivet is modeled by spring-damper elements. Several numerical models are studied with different quantities of rivets (1, 3 and 5) and spring-damper elements (4, 6, 8, 12, 16 and 20) per rivet. In parallel, samples of two aluminum material plates connected by different quantities of rivets (1, 3 and 5) are built and tested in order to be known its modal characteristics – natural frequencies and mode shapes. The purpose of the different settings is to get the best numerical riveted lap joint representation relatively to the experimental one. For this purpose a finite element model updating methodology is used. An evaluation of the best numerical riveted lap joint is carried out based on comparisons between the numerical model after updating and the experimental one. It is shown that the riveted lap joints composed by eight and twelve spring-damper elements per rivet have the best representation. A stiffness constant value k is obtained for the riveted lap joints in study.
A Game Theoretic Analysis on Cloud Manufacturing Model
Authors: Chen Qi Yu , Wu Zhi Heng , Luo Liang Chuan , Tong Ji Gang
Published: August 2014

As one of the new models of service of integrated manufacturing system, Cloud manufacturing (CM) is a service oriented, customer centric, demand driven manufacturing model.Application providers offer manufacturing services through the network, to make the cooperation among the participants of CM more effective. The behaviors of participants have great effect to the development of CM, especially in the beginning of its application.In this paper, we make analysis on interaction among all the participants of CM based on game theory, and give some suggestions to promote the application of CM.
A Novel Technique for Dynamic Analysis of Beam-Like Structures on Tensionless Elastic Foundations Subjected to Moving Loads
Authors: Attar Mostafa , Karrech Ali , Regenauer-Lieb Klaus
Published: August 2014

In this paper, a novel method is proposed to address the non-linear dynamic response of a beam-like structure supported by a tensionless foundation due to moving loads. A lattice spring model (LSM) is developed to describe the structure as a discrete assembly of particles interacting via shear and rotational springs while the tensionless foundation is simulated using a chain of one-way normal springs connecting the particles to the ground. The total time for the travelling load to traverse the beam is divided into a number of steps and the generalised explicit matrix equation can be solved for each time step to obtain the time-history response of the structure. An iterative procedure is adopted to obtain the correct sign of lateral displacement for all particles at each time step, which determines the lift-off regions throughout the beam.
On-Machine Measurement System Implemented Based on Fanuc CNC System Using a Touch Trigger Probe
Authors: Zhang Rong , Wang Ya Ping
Published: August 2014

This paper aims to implement an OMM (on-machine measurement) system using a touch trigger probe installed on the spindle of the milling machine with Fanuc 0i-mc CNC system. The CNC used in the milling machine is Fanuc 0i-mc system. The hardware system configuration for OMM and its software were both presented. The software is composed of several modules, and the most significant one is for generating measurement program based on CAD model of workpiece. This paper mainly presents the specific construction of the measurement macro for Fanuc system.
Contact Pressure Distribution in Joints Formed by V-Band Clamps
Authors: Barrans Simon , Khodabakhshi Goodarz , Xu Qiang
Published: August 2014

V-band clamps offer an efficient clamping solution in diverse applications including process equipment, exhaust systems and air handling. This paper studies the distribution of interface contact pressure between the V-band and flange when the coupling is established. The determination of the contact area and pressure distribution in a joint is essential information, as it determines the integrity of the coupling. A three dimensional finite element model has been developed for this purpose. Contrary to the previous assumption in developing axisymmetric models, the 3D results showed that the contact pressure is non-uniform around the circumference of V-band with maximum contact pressure near the T-bolt area. This is in agreement with the theory in the literature. The presence and magnitude of friction has a noticeable influence on the form of the interface pressure distribution curve. It is also shown that the diameter of the band interacts with the effect of friction.
Aerodynamic Performance of Blended Wing Body Aircraft with Distributed Propulsion
Authors: Yan Wan Fang , Wu Jiang Hao , Zhang Yan Lai
Published: August 2014

A 350-passenger BWB with a distributed propulsion system configuration is carried out and its aerodynamic performance in cruising and taking off are analyzed and discussed. It is shown from computation that the integrated configuration has a commendable aerodynamic performance in cruising and taking off. The cruise lift to drag ratio is reach to 24.0 in cruising. The ingestion effect of the propulsion system leads to a high lift at a low speed. The maximum lift coefficient CLmax is 1.62 when α=20° in taking off. In addition, the ingestion also delays the flow separation on the upper surface of center body, which contributes to a well stall performance of the configuration at large angle of attack.
The Effect of Gust on Blended-Wing-Body Civil Aircraft
Authors: Cai Chen Fang , Wu Jiang Hao , Liang Bin
Published: August 2014

In this paper, aerodynamic properties of Blended Wing Body (BWB) civil aircraft are studied by two models: one calls complete model that is computed by numerical simulation coupling equations of motion with the Navier-Stokes equations, and the other doesn’t consider the equations of motion (without dynamic response). The results show that the model without dynamic response can also correctly predict the trend of the dynamic properties compared with complete model. Nevertheless, there are some quantitative differences existing between the complete model and the model without dynamic response.
Aerodynamic and Performance Analysis of Representatives of One Century of Low Speed Aircraft
Authors: Fragola Barbosa Luciano Magno , de Oliveira Paulo H. Iscold A.
Published: August 2014

This work presents a comparative study of aerodynamic and performance characteristics of relevant examples of low speed aircraft that have been built and flown between 1890 and 1990. As speed is related to aircraft mass and wing loading and power, the aircraft analyzed present low weight, low wing loading and low power. To generate this study a set of tools have been developed, which are specifically aimed to slow and light aircraft. One additional goal of the study is to obtain a consistent reference data basis - by using the developed tools to analyze existing aircraft - prior to use these tools in new designs with the features of low speed, low wing loading and low power.
Building Data Fusion Surrogate Models for Spacecraft Aerodynamic Problems with Incomplete Factorial Design of Experiments
Authors: Belyaev Mikhail , Burnaev Evgeny , Kapushev Ermek , Alestra Stephane , Dormieux Marc , Cavailles Antoine , Chaillot Davy , Ferreira Eugenio
Published: August 2014

This work concerns a construction of surrogate models for a specific aerodynamic data base. This data base is generally available from wind tunnel testing or from CFD aerodynamic simulations and contains aerodynamic coefficients for different flight conditions and configurations (such as Mach number, angle-of-attack, vehicle configuration angle) encountered over different space vehicles mission. The main peculiarity of aerodynamic data base is a specific design of experiment which is a union of grids of low and high fidelity data with considerably different sizes. Universal algorithms can’t approximate accurately such significantly non-uniform data. In this work a fast and accurate algorithm was developed which takes into account different fidelity of the data and special design of experiments.
Estimation Mass of the Aircraft Wing with the Multidisciplinary Process
Authors: Fayssal Hadjez , Brahim Necib
Published: August 2014

The purpose of this project is to study and practice the techniques discussed in multidisciplinary courses aeronautical structure and load calculations to estimate the mass of an aircraft wing. The model studied is the Airbus A320. We first describe the characteristics of the wing of the aircraft. We will then study the aerodynamic forces, their distribution in the wings and aerodynamic load cases. In the next section, we will calculate the stresses induced by the bending of the wing and deduce the thickness of coatings that resist buckling. We also do a sensitivity analysis on the pitch of the ribs and stiffeners. Then, we will model the wing in SolidWorks and we will issue the card with Nastran constraints. Finally, we will provide our comments on the orders of magnitude obtained and the assumptions made the means to implement must be substantial to obtain an accurate result. The challenge of this project is to model the wing sufficiently wise to obtain an order of magnitude closer to reality. We consider an error of 15-20 % compared to the actual weight of the wing is suitable as part of a project like this [1].
Assessment of Real Gas Effects on Approximate and Boundary Layer Equations for Hypersonic Laminar Flow over Axisymmetric Bodies
Authors: Moghadam Ramin Kamali , Hosseini Seyed Amir
Published: August 2014

Two efficient computational procedures based on the boundary layer equations and approximate relations areassessedin prediction of the laminar hypersonic flowfield for both the perfect gas and equilibrium air around the axisymmetric blunt body configurations. For the boundary layer procedure, the boundary layer equationsutilize the integral matrix solution algorithm for the blunt nose and after body region by using a space marching technique. The integral matrix procedure able us to create accurate and smooth results using the minimum grid in the boundary layer and minimize the computational costs. Applying the approximate method creates a robust and efficient code for heating calculations over the blunt bodies which flies in hypersonic regimes. These algorithms are highly appropriate to design of hypersonic reentry vehicles. The effects of real gas on the flowfield characteristics are also studied in two procedures.
CFD Modeling and Design of Wind Boosters for Low Speed Vertical Axis Wind Turbines
Authors: Korprasertsak Natapol , Korprasertsak Nataporn , Leephakpreeda Thananchai
Published: August 2014

In Thailand, the average wind speed is generally quite low (≈ 3 - 4 m/s). Although Vertical Axis Wind Turbines (VAWTs) are designed for low speed wind, standalone VAWTs are still unable to generate power satisfactorily under that practical condition. This study introduces a new design of a wind flow controlling device, called a “wind booster”, by utilizing Computational Fluid Dynamics (CFD). A wind booster is developed for incorporating with a VAWT in order to increase the performance of the VAWT and to overcome the limitation of harvesting energy with low availability at low speed wind. The guiding and throttling effects of the optimal design of the wind booster are able to increase the angular velocity of VAWTs which leads to an increase in power generated from VAWTs.
Investigation of Syngas Combustion at Variable Methane Composition in Can Combustor Using CFD
Authors: Zian Norhaslina Mat , Hasini Hasril , Om Nur Irmawati
Published: August 2014

This paper describes the analysis of the fundamental effect of synthetic gas combustion in a can-type combustor using Computational Fluid Dynamic(CFD). Emphasis is given towards the effect of variation of methane to the flame profile, temperature distribution and heat flux in the combustor. In this study, the composition of hydrogen in the syngas was fixed at 30% while methane and carbon monoxide were varied. Results show that the flame temperature and NOx emissions are highly dependent on the composition of methane in the syngas fuel. Nevertheless, the overall NOx emission for all cases is relatively lower than the conventional pure natural gas combustion.
Investigation of Engine Performance and Emission Characteristics of Si Engine Fuelled with Ethanol Blends by Numerical Simulation
Authors: Ozgur Ceyla , Tosun Erdi , Ozgur Tayfun , Tuccar Gökhan , Aydin Kadi̇r
Published: August 2014

In this study the influences of ethanol addition to gasoline on an spark ignition engine performance and emissions were explored. AVL BOOST software was used to simulate the performance and emission characteristics of different ethanol-gasoline blends. The blended fuels contain 5%, 10% and 15% of ethanol by volume, and indicated as B95E5, B90E10, and B85E15, respectively. The results showed that ethanol addition to gasoline fuel improve combustion process, decrease CO emissions and reduce BSFC of the SI engine.
Design of System Hydrogen Engine Supercharging
Authors: Popelka Josef
Published: August 2014

In this paper I am dealing with a general analysis of problems burning of lean hydrogen mixtures in combustion engines. During burning of very lean mixtures burning procedure is over lasted with characteristic features. They need to be removed or reduced. One of these features is low power of engines operating by lean mixtures, which can be partially removed with the help of supercharging such engines. In the second part of the paper I am dealing with a design of supercharging system for a three-cylinder engine with volume 1,2 dm3.
Numerical Analysis of Tumble, Cross Tumble and Swirl Ratios in a Single Cylinder Research Engine
Authors: Fonseca Leonardo , Coelho Raniro , Braga Raphael , Pena Bruno , Valle Ramon Molina
Published: August 2014

In-cylinder flow such as tumble and swirl has an important role on the engine combustion efficiencies and emission formations. In particular, the tumble flow whichis dominant in current high performance gasoline engines has an important effect on the fuel consumption and exhaust emissions under part load conditions. In this research a numerical analysis on a single cylinder engine using computational fluid dynamics (CFD) is presented. From the results of the commercial code, the tumble, cross-tumble and swirl ratios are calculated for evaluating the flow development through intake and compression strokes. The reliability of the results is accessed through a validation process, which consists of comparing numerical and experimental results for in-cylinder pressure, along with a grid independence study. The results for the in-cylinder pressure show good agreement between numerical and experimental results, and the grid independence is rapidly achieved. The results for rotational ratios around X and Z axis show lower and unstable values, and indicate that the vortex on those plane change its rotation direction. On the other hand, the ratio around Y axis has the greater values, and also keeps its rotation direction.
Optimization Design for Contour of Pintle Nozzle in Solid Rocket Motor Based on Response Surface Method
Authors: Cheng Chen , Bao Fu Ting , Xu Hao
Published: August 2014

In aim to gain the capability of providing variable thrust, the technology of an axial pintle inserted into the nozzle of the solid rocket motor had been used. As the pintle inserted into the nozzle, the loss of specific impulse will increase. In order to reduce the loss of fluid dynamics of the pintle nozzle, considering the interaction of the nozzle contour and the pintle contour, CFD method combined with the response surface method is used to optimize the contour of the pintle nozzle. The central composite design is used to introduce a design point; the Kriging algorithm is used to generate the response surface; and the Nonlinear Programming by Quadratic Lagrangian is used for optimization. After the optimization, the loss of fluid dynamics can be reduced significantly. To study the influence of the key parameters to the loss of specific impulse, the key parameters are optimized independently in this paper. It indicates that the main factor of the loss of specific impulse is the parameters of the nozzle. To reduce the computational consumption, the process of optimization has been improved. And the result shows that when optimizing a pintle nozzle, the nozzle part and the pintle part can be optimized separately. The method that bases on the response surface not only takes into account of the interactive effects of the shape parameters, but also works with less calculation. Additionally it maintains the high accuracy and reliability. It can be used to select the optimal shape parameters of the pintle nozzle quickly, which has certain engineering application value.
Assessment of a General Aviation Pilot Assisting System Influence on the Piloting Performance and Safety of Inexperienced Pilots
Authors: Santana Guilherme A. , de Oliveira Paulo H. Iscold A. , Cimini Carlos A. , Filho Antônio R. da Silva , Ferreira Leonardo De Paula S. , Torres Rodrigo A.
Published: August 2014

The main goal of the present work was to assess and test a pilot assisting technique for light aircraft with inexperienced volunteers. The pilot assisting technique consisted of modified PID controllers with gain scheduling, with features to maintain the pilot authority and flight safety, simplifying the piloting. After the gain adjustment, the controlled model (pilot assistance) was adapted into a simulation platform of the ACS-100 Sora aircraft at CEA-UFMG and volunteers were invited to simulate a flight in a predefined trajectory. It was possible to conclude that inexperienced volunteers were able to improve significantly on this task.
Kinematic Analysis for Hybrid 2-(6-UPU) Manipulator Using Wavelet Neural Network
Authors: Rahmani Arash , Ghanbari Ahmad , Pedrammehr Siamak
Published: August 2014

This paper addresses forward and inverse kinematics of a specific class of serial-parallel manipulators, known as 2(6-UPU) manipulators. This manipulator composed of two modules which consist of elementary manipulators with the parallel structure of Stewart Platform. At first, the Kinematics Model of the hybrid manipulator is obtained. As there is a highly nonlinear relations between joint variables, and position and orientation of the end effectors, the inverse kinematic problem of these manipulators is quite complicated to solve. In this study, wavelet based neural network (WNN) with its inherent learning ability, is used to solve the inverse kinematic problem. Also, proposed wavelet neural network is applied to approximate the paths of mid and upper plates in circle and spiral trajectories. Finally, the results of simulation show high accurate performance of proposed method.
Heat Transfer Enhancement in Turbine Blade Internal Cooling Ducts
Authors: Karaman Mehmet , Özkol Ibrahim , Kömürgöz Güven
Published: August 2014

Gas turbine is a type of rotary engine that consists of compressor, combustion chamber, and turbine sections. This type of engine works in the Brayton Cycle principle that is compression of atmospheric flow, combustion of air-fuel mixture and expanding high temperature combustion flow to generate power output from turbine. The aim of this study is to determine the duct geometry and flow conditions of the gas turbine blades having the internal cooling ducts that acquire highest heat transfer on turbine blades. For different design of internal duct geometries and flow conditions, Fluent solver is used and solutions are validated with Han’s experimental results.
Study on Spring-Back Effect with Various Temperature of Magnesium Alloy in Roll Forming Process
Authors: Kim Dong Hong , Yoon Dae Hwan , Yu Hao , Jung Dong Won
Published: August 2014

AZ31 magnesium alloy sheets are usually performed at high temperatures of 200 to 250°C due to their unusual hexagonal close-packed structure and low ductility at room temperature. In this study, to predict the spring-back of AZ31 magnesium alloy sheets in a roll forming process subjected to high temperatures, so the spring-back phenomenon consider in various temperature using an explicit finite element code. Finally, the roll forming process for a magnesium alloy sheet at high temperatures was performed to verify the spring-back angle, which was then compared with the spring-back angle predictions of the FE simulation.
RETRACTED: Hybrid Hidden Markov Models and Neural Networks Based on Face Recognition
Authors: Wang Ming Qian , Gao Da Bing , Hong Zuo Xin , Gao Qiang
Published: August 2014

Retracted paper: In this paper, the basic principles of HMM, HMM studied three major issues need to be addressed as well as overflow problems in the practical application of how to solve the HMM. Because artificial neural network (ANN) with anti-noise, adaptive, learning ability, recognition speed, etc., taking into account the characteristics of the common features of speech recognition and pattern recognition and artificial neural networks have, this article will get a mixed combination of HMM in ANN model, using ANN to make up for some deficiencies of HMM. Experiments show that the hybrid model recognition rate than the HMM model increased by 4%, but the algorithm still has many defects to be resolved.
Stochastic Models in Preventive Maintenance Policies
Authors: Gölbaşı Onur , Demirel Nuray
Published: August 2014

In recent decades, philosophy behind maintenance has varied consistently due to the changes in complexity of designs, advances in automation and mechanization, adaptation to the fast growing market demand, commercial computation in the sectors, and environmental issues. In mid-forties, simplicity of designs, limited maintenance opportunities, and immaturity of trade culture made enough to perform only fix it when it broke approach, i.e. corrective maintenance, after failures. Last quarter of the 21th century made essential to constitute more conservative and preventive maintenance policies in order to ensure safety, reliability, and availability of systems with longer lifetime and cost effectiveness. Preventive maintenance can provide an economic saving more than 18% of operating cost of systems. In this basis, various stochastic models were proposed as a tool to constitute a maintenance policy to measure system availability and to obtain optimal maintenance periods. This paper presents a general perspective on common stochastic models in maintenance planning such as Homogenous Poisson Process, Non-Homogenous Poisson Process, and Imperfect Maintenance. The paper also introduces two common maintenance policies, block and age replacement policy, using these stochastic models.
Infant Pain Recognition with Homomorphic Filter and k-NN Classifier
Authors: Mansor Muhammad Naufal , Junoh Ahmad Kadri , Ahmed Amran , Kamarudin Hussin , Idris Azrini
Published: August 2014

During the previous recent years, non-invasive schemes of facial image studies have been confirmed to be outstanding and dependable instrument to analyze the pain condition. This paper proposes a new feature vector based principal Component Analysis (PCA) for the pain detection. Different Eigen vector are proposed to evaluate the performance of the proposed features. In this work, Infant COPE database is used with illumination added. Homomorphic Filter (HOMO) is applied to remove the shadow. K-NN classifier is employed for testing the proposed features. The experimental outcomes uncover that the suggested features provide very promising results which is higher than 90% for Infant COPE database.
Experimental Research on CuCr Contacts Cathode Spots with Material Properties
Authors: Xu Guo Shun , Wu Guo Lin , Zhuang Jin Wu
Published: August 2014

Vacuum arc is supported by metal vapor which comes from cathode spots, the research on cathode spots can reveal the nature of vacuum arc, this will help improve the breaking capacity of the vacuum switch. This paper constructs the research platform which is based on vacuum arcing chamber, the contact material is CuCr50, through high-speed camera on the cathode spots, analysis found that: cathode spots usually consist of multiple micro spots, these spots stay together and form a micro-spot group; the minimum maintain current of a single micro spot is 7A, and the upper limit current is 25A; the upper limit current of a single cathode spot is 100A; along with the increase of current, the division of the micro-spot group will be more and more obvious, and eventually evolve into multiple independent cathode spots.
Numerical Estimation of Ship Resistance Using CFD with Different Turblence Model
Authors: Abdelkhalek Hany , Han Duan Feng , Gao Liang Tian , Wang Qing
Published: August 2014

As computers and computational methods continue to develop, the possibilities of using Computational Fluid Dynamics (CFD) in the ship design process is rapidly increasing. Potential ﬂow methods, and even simpler methods, are used regularly, whereas viscous calculations, using Reynolds Averaged Navier-Stokes (RANS) models, are rapidly becoming feasible with respect both to the necessary computational resources and the achieved accuracy. Scale-model tests usually provide resistance and powering curves, which are diﬃcult for computations to reproduce, as well as providing detailed data in important regions. Computations provide an overall picture of the ﬂow that can help in its understanding and thus also in the hull development process. A combination of model tests and computations appears to be the best approach to develop novel hull concepts, and should be promoted even further. However, even RANS have limitations, mainly for applications where small-scale and/or unsteady ﬂow phenomena are of interest but also when new, innovative designs are developed, the reliability of RANS may be problematic. This present work, describes the implementation of CFD techniques for determining the calm water resistance of a ship at different speeds. The ship hull flow is analysed for different ship speeds in calm water conditions. The results obtained from CFD analysis are compared with available standard results.
Design and Implementation of AES Key Generator Based on FPGA
Authors: Li Hong Ye , Cai Guang Hui , Sun Hong Chao , Ma Xiao Cong
Published: August 2014

With the continuous development of computer networks, security of data is particularly important. AES algorithm is the new data encryption standard after DES algorithm, which has a higher security and faster running speed. Since the promulgation, it has been widely analyzed and multi used around the world. AES algorithm is iterative algorithm,which needs a key generator to generate the encryption and decryption keys for each round.The key generator mainly designs two modules including S box replacement (SubWord) module and Cycle left shift (RotWord) module. After processing results and Rcon array XOR, the key generator may generate an expanded key. The whole design has a simple circuit structure, less resource-intensive, fast running speed advantages, with good prospects for practical applications.
The Formation of Temperature Controller by PSoC
Authors: Lin Wen Bin , Lu Yi Yu
Published: August 2014

Due to the increasing consumption of energy, the improvement of the cooling system efficiency has become very important. We use programmable system-on-chip (PSoC) to fabricate a temperature control system. These chips include a CPU and mixed-signal arrays of configurable integrated analog and digital peripherals. This system controls the cooling fan speed by temperature detecting. This system uses buzzer and liquid crystal display (LCD) to remind the users. The user can start emergency protection means at once. However, we have designed a controller to control fan speed in according with the difference of measured temperature. This research has the function of power saving and elements protection by reducing to turn on and off a cooling fan. With a simple modification, we can turn any control fan by PSoC control. Today, everybody must use electric appliance. We will use PSoC with temperature-controlled method together to control the cooling device.
Study on Fault Testing System of Photovoltaic Cells
Authors: Jiang Yu Chuan , Yang Fang Quan , Sun Bao Gang
Published: August 2014

This paper designed a photovoltaic cell fault test system to study the design of wireless sensor networks and related technologies in this article, including the two main parts of the data collection and data aggregation node node design, through the design of the circuit to collect voltammetry data by DHT22 digital temperature and humidity sensors and related peripheral circuits to collect temperature, humidity and light intensity data presented content power circuit design serial communication circuit, and anti-jamming measures.
Design of Embedded Control System for Window-Cleaning Robot
Authors: Zhu Chun Jia , Sun Zhi Feng
Published: August 2014

Considering increasing importance of home service robot, the embedded control system based on TI msp430 and μC/OS-II is designed for window-cleaning robot. This paper includes three aspects, i.e., functions, hardware and software design. In the development of the system, the robot can be controlled by smart home system. PID controller is used to control DC motor stably. Meanwhile, a complete coverage path planning is proposed for efficiency.
Applied Technology the Test of Elevator Running Mileage (Dynamic) of Scientific Significance
Authors: Gao Jiong , Teng Yi Fei , Yuan Wei Cheng
Published: August 2014

The dynamic parameters of elevator operation is refer to the service life of the elevator , operation frequency, operation time, operation mileage number. To master the elevator running mileage is the basis of that the management,inspection, elevator maintenance work is changed to the hierarchical, accurate,scientific orientation. At the same time, which is provided the scientific basis to replace parts of elevator and scrap the elevator standards.
Research on Applied-Information Technology with Management Pattern of Multi-Media Devices and Design of RFID System
Authors: Yang Zhi Yuan , Chao Pan Pan , Gao Yi Jiao , Zhao Lian Qing
Published: August 2014

With the extensive development of ways of teaching, multi-media device has become more accessible on campus and its inconveniences of both management and maintenance are also manifested. On the basis of RFID (Radio Frequency Identification) technology, the passage proposes an achievable solution aimed at handling inconveniences with the management and maintenance, including a functional management pattern and a design of RFID system, which uses a two-way authentication and SMS4 encryption algorithm, and moreover, the system adopts CFB pattern to improve its adaptability.
An Improved Initial Clustering Center Selection Method for K-Means Algorithm
Authors: Zhou Hong Bo , Gao Jun Tao
Published: August 2014

Clustering result is easily influenced by the initial clustering centers in the K-means algorithm,an improved algorithm about initial clustering centers selection is presented.The algorithm finds the maximun Euclidean distance of cluster firstly,and then makes the cluster to split by used two data objects which have the maximum distance as new clustering centers,repeat the above steps until the specified number of clustering centers are obtained.Compared to the original algorithm,the improved algorithm can solve the problem of the instability of clustering effect generated by randomness, and its time complexity was also decreased.
The Study of Deformation Monitoring Based on the Ground Three-Dimensional Laser Scanning Technology
Authors: Liang Bin , Yue Chong , Chen Xu Hui , Wang Bing , Sun Xing Kai
Published: August 2014

s: This paper mainly uses the ground three-dimensional laser scanning technology to collect the date of two coal mining deformation point cloud. First of all, according to the distance measurement precision and scanning point spacing scanning scheme is designed; then, focuses on the analysis of scanner splicing error; finally, through three ways : dot, line, face; we do compare analysis to two deformation and obtain the deformation results of the entire mining area. The experimental results show that: three-dimensional laser scanning technology has these advantages: high work efficiency, high data accuracy, obtaining the deformation data of subsidence zone of the whole basin.
Research on Strain Gauge Protecting-Process to Measurement Data Accuracy of Composite Material Structure
Authors: Zuo Jia , Chen Ge , Wang Gang
Published: August 2014

With the extensive application of composite materials in aircraft structure, the test technologies of strain gauge are more important. But the installed strain gauge must to be protected against some influence. Because the protecting-process of strain gauge affected the strain measuring results of composite structure. In this paper, the composite (T700/LT-03A) was selected to made specimens, and the three different protective agents: protective glue, protective grume and protective grummet were adopted. In order to identify influence of the different protecting processes on the measuring data accuracy, comparison of repeatability and linearity before-and-after measured strain data are served as test standard. The compared test results show that the different strain protecting processes adopted in strength test can make different results of the measuring data accuracy.
Application and Realization of Digitization of Traditional Metallographic Microscope
Authors: Huang Song Lin , Cui Jian Zhong
Published: August 2014

Metallographic microscope is an indispensable tool for metallurgical studies, which played an important role in materials science research and experiment. For a long time, metallographic examination results are output in the form of a photosensitive film. This film-based imaging record way has become increasingly unsuited to the study of modern materials science. Digital metallographic microscope is a modern high-tech product, which combines optical microscopy techniques, photovoltaic technology and computer image processing technology. A digitization method is presented for the traditional metallographic microscope in this paper. Experimental results show that the digitization for metallographic microscope is feasible, which meets the requirements of modern materials science research.