bluuebunny/crossref_metadata_2025 huggingface dataset:
Control Techniques to Directly Parallel Line-Side Converters for Wind Energy System
Authors: Benjanarasut Jirawut , Neammanee Bunlung
Published: December 2014

The direct paralleled converters can increase the power rating, reliability, efficiency, as well as decrease the cost and current/voltage ripples which are suitable for high power converters. However, when converters are in direct parallel, the circulating currents will be generated automatically. This will result in high current distortion which causes the line inductors saturation and damage the power switches; and therefore overall performance of the system will be degraded. This paper purposes a zero sequence current control technique to reduce the circulating current in directly parallel line-side converter of the wind energy conversion system. The case studies are carried out on a 2 MW wind turbine to investigate the effects of non-identical line inductors and PWM carrier phase shift of each converter to the circulating current. The simulation results confirm that zero sequence current controllers that can reduce the zero sequence current in any conditions. The dynamic responses of the direct parallel converters and a single converter are nearly the same but the direct parallel converters have better current ripple and THDi.
Dynamic Behavior of Flexible Drive Train Models and Back-to-Back Converter for DFIG Wind Turbines during Voltage Sags
Authors: Sadara Wara , Neammanee Bunlung
Published: December 2014

This paper proposes an accurate complete model of a DFIG wind turbine composed of the flexible drive train model, the DFIG, the back-to-back converter, the protection systems, and the control techniques. The simulations use the Matlab/Simulink program to investigate the dynamic behavior of these parts on the 2 MW wind turbine. The simulations show the complete dynamic behavior of electrical and mechanical under normal operation, and voltage sags. Moreover the control logic of an active crowbar protection during high rotor current, and the control logic of a DC-chopper protection during high DC-bus voltage are presented. It can be seen that both protection schemes can limit the current and DC-bus voltage as well as generator torque. The demagnetization control technique also reduces the high transient rotor current and the generator torque during recovery process.
Study on the Prior Information Credibility Test in Low-Voltage Switchgear Reliability Assessment
Authors: Xu Shu Yu , Wang Jing Qin
Published: December 2014

Reliability Assessment of low-voltage switchgear is of great significance to the safety of power system and its equipment. In this thesis, Bayes theory is introduced into the reliability Assessment of low-voltage switchgear. The main failure modes and failure rate of low-voltage switchgear has been summarized, and the fault arrangement diagram of low voltage switchgear is given in this paper. In view of the low-voltage switchgear with high reliability and relatively large number of samples, a feasible compatibility test method is proposed. Firstly, the distribution type can be tested through engineering experience and Goodness of fit test for weibull distribution. Then a prior information compatibility test is carried out by Wilcoxon rank sum test and Kolmogorov-Smirnov nonparametric test method. Finally, the prior information which is incompatible with credible site information is removed and reliable prior information is obtained. This paper lays a solid foundation for the Low-voltage switchgear reliability assessment based on Bayes theory.
A Dispatch Algorithm for Smart Grid with Wind Generation
Authors: Gao Ming Sheng , Jiang Hui
Published: December 2014

Due to the volatility and intermittence of wind generation, it is challenging to develop an economic dispatch algorithm for smart grids that not only meets the dynamic demand of electric energy, but also maximizes the benefits of energy suppliers using such renewable resource. In this paper, we account for smart grids with two categories of energy users, namely traditional energy users and opportunistic energy users, and address pricing and dispatch at one period of time (e.g., in hours). We model this problem as a stochastic programming problem that can be solved to determine the optimal day-ahead retail price, real-time price and the procurement of electricity energy.
Solar Hybrid PV System for Off-Grid Electrification in Semenyih, Malaysia
Authors: Fahmi M.I. , Rajkumar R. , Arelhi R. , Rajkumar R. , Isa D.
Published: December 2014

A low maintenance solar photovoltaic (PV) system is designed to supply power to households in rural areas that are not connected to grid utility. A 2kWh system was developed in a custom made rural cabin in Semenyih, Malaysia. The system was tested with varying loads by using a programmable load. The programmable load is used as a real time load to test the power usage and efficiency of the system. The results obtained shows that the proposed system can supply sufficient power to rural homes at low maintenance costs. The results obtained from this system can be used for implementation on rural homes without the need for backup power generators such as diesel generators.
Parameters Identification and Simulation of Equivalent Circuit Model of Lead-Acid Battery
Authors: Li Kuang Cheng , Liu Yan , Guo Xiao Ran , Liu Zheng
Published: December 2014

As a complex system, lead-acid batteries are affected by a number of factors, most of the lead-acid battery equivalent circuit models contain a large number of parameters, and the validity and accuracy of the models have a great relationship with the values of these parameters. Therefore, the parameter identification is a very important job of the modeling work. In this paper, we use the 7-HK-182 lead-acid battery for the study, doing charging and discharging experiments of this lead-acid battery, establish an equivalent circuit model, and identifying the parameters of this model, at last, through the simulation, we determine the accuracy of the parameters identification of the equivalent circuit model.
Study of Micro-Mechanical Properties of Alloyed Surface with TiNi Layer Considering Shape Memory Effect
Authors: Blednova Zh.M. , Rusinov P.O. , Myshevsky I.S.
Published: December 2014

Mechanical tests of alloyed TiNi compounds with shape memory effect were performed. Low-cycle tests of alloyed compounds showed that an increase in the number of cycles to failure doubled. Studies conducted using the indentation showed shape recovery of print on material of alloyed weld within 0.7-1.2%.
Efficient Vehicle Tracking for Automated Power Line Surveillance System
Authors: Cheng Wei Zhen , Xu Man Tao , Cheng Wu Chao
Published: December 2014

One of the major threats to the safe and normal operation of the power transmission lines is the external force or intrusion incurred by construction trucks. Especially for the urban area, construction of truck cranes is increasingly becoming a leading cause to the damages of power transmission lines. However, the conventional monitoring method for protecting power transmission lines is to conduct a routine inspection or patrol on the transmission line network periodically, which is time-consuming and laborious. In this paper we propose a video surveillance system for automatic tracking the dangerous strength such as construction cranes. The criterion of context formation aims to detect the jib of crane and compute its extension angle. Once the crane is parked over a certain period of time, or the jib extension angle exceeds predefined thresholds, warning messages will be sent to power line supervisors. The experiments show that the system is able to achieve automatic detection of truck cranes and protect transmission lines from their careless constructions.
The Interference Study of Green-House Gases for an Ammonia Sensor
Authors: Manap Hadi , Lewis Elfed
Published: December 2014

This paper describes a preliminary study of the possibility for greenhouse interference during ammonia measurement in the 200nm-230 nm region. An absorption spectrum for ammonia was compared with the greenhouse gases absorption lines to theoretically justify that there were no discernible interference effects during the ammonia concentration measurements. It was theoretically found that the primary greenhouse gases namely ozone, methane and nitrous oxide have no significant interference for ammonia sensing in the 200nm-210 nmregion.
An Integrated Fault Detection and Diagnosis Using Kaman Filter and Eigen Structure Assignment - Application to Three Tank System
Authors: Aarthi R. , Natarajan R. Ananda
Published: December 2014

An integrated fault detection and diagnosis approach against partial actuator failure for discrete-time stochastic systems has been proposed. When the dynamics of the process under control are changed due to the component (actuator) faults, the performance of the system degrades. The aim of proposed scheme is to detect and diagnoses the fault present and also to predict the effectiveness of the actuator. The scheme is based on a kalman filter for the parameter estimation via the Eigen structure assignment. This method also guarantees the stability of the system by analyzing the cost effectiveness factor of the actuator. The proposed approach it is demonstrated in a three tank benchmark system and the result illustrates its robustness.
Deformation Monitoring Model of Jinping-I Hydropower Station Based on NACA-BP Neural Network
Authors: Cai De Wen , Shao Chen Fei , Wang Di Kai , Zhao Er Feng , Yang Meng
Published: December 2014

Back Propagation (BP) neural network can learn and store a large number of input-output model nonlinear relationships with simple structure. Niche ant colony algorithm (NACA) combines the ant colony algorithm (ACA) with the niche technology in order to add its local search ability to ACA with preserving the intelligent search ability and robustness of ACA. To optimize predicting model establishment of the dam monitoring data, NACA and BP neural network modeling method are combined to establish a prediction model of horizontal displacement monitoring data. The traditional BP neural network prediction model is established to make a comparison with the NACA. The results show that NACA-BP neural network method can speed up the convergence rate of BP neural network and enhance local search ability and prediction accuracy.
State Feedback Controller - An Alternative Approach Applied to Unmanned Aerial Vehicle
Authors: Aguiar Renato A. , Leonardi Fabrizio
Published: December 2014

The primary goal of this work is to propose an alternative methodology as a first approach in the design of control systems by means of a feedback state gain. The proposed method is detailed and an application is presented. The results show relevant aspects regarding the state feedback gain, especially in regard to variation in the parameters of the plant.
Design and Implementation of Web Based Mobile Robot Control Platform for Robotics Education
Authors: Erdemir Gokhan , Kuzucuoglu Ahmet Emin , Kaplanoglu Erkan , El-Kahlout Yasser
Published: December 2014

In this paper, we present a particular case of a dynamic, real-time and efficient web-based mobile robot experiment platform (WEB.MREP) design for mobile robotic applications. The design and construction of a multipurpose and WEB.MREP for the application of different path planning and tracking, simultaneous localization and mapping (SLAM) and robot vision techniques for mobile robotic system is the main purpose of this study. The designed and constructed experiment platform consists of five main components: Festo Robotino mobile robot sets, a designed experimental area, a server software, web interfaces (user interfaces) and security measures. The designed platform provides monitoring, real-time controlling and programming of mobile robots for experimental studies and, it helps the users to achieve these studies through a standard web browser without any additional supportive software.
Application of RF MEMS Switch for Reconfiguring Micromachined Antennas
Authors: Rajmohan Jija , Baiju M.R.
Published: December 2014

For mobile and wireless applications where the size of the system has to be minimized, antenna and RF components are to be integrated on to the same substrate. The contradicting requirements of the substrate with respect to the antenna and the RF circuit can be resolved by using micromachined antennas. If the principle of reconfigurability is applied to the micromachined antenna, it increases the versatality of the system. This paper proposes reconfigurability of micromachined antennas using RF MEMS switches. In the case of micromachined antennas, which involve low voltage signals, RF MEMS switches with low actuation voltage are required for achieving reconfigurability. In this paper an RF MEMS capacitive switch operating at a low actuation voltage of 1 Volt is presented
Efficiency Improvement of Hybrid Solar Cells Using Solvent Modified PEDOT:PSS Hole Conducting Layer
Authors: Yu Ming Hung , Sun Kien Wen
Published: December 2014

This work aims to enhance the power conversion efficiency of PEDOT:PSS/Si hybrid solar cells by reducing the resistance of PEDOT:PSS of hybrid solar cells using simple solvent treatment. A noticeable decrease in resistance of PEDOT:PSS layer was found after treating with DMSO and methanol using the dipping method or the mixing method. The combinations of these two methods allow us to greatly enhance the fill factor and power conversion efficiency of hybrid solar cells due to the significant reduction in Rs.
Development of Miniature Electromagnetic Devices Combined with Silicon and Magnetic Ceramic
Authors: Takato Minami , Endo Hiroaki , Maezumi Kazuaki , Yokozeki Yuji , Saito Ken , Uchikoba Fumio
Published: December 2014

As portable devices become smaller and more convenient, they increasingly require miniaturized batteries that preserve the light weight of the device while delivering sufficient power. However, miniaturization of conventional magnetic devices is precluded by the magnetic material and helical structure of the coil. To solve this problem, we introduce a multilayer ceramic technology that realizes three-dimensional miniature magnetic devices. The miniature components are fabricated by micro-electro-mechanical systems (MEMS) technology. This paper describes an electromagnetic motor and an electromagnetic induction type air turbine generator developed through MEMS and multilayer ceramic technologies. The fabricated motor is 4.2 [mm] in diameter and 6.0 [mm] in height, runs at 1080 rpm, and has a consumption power of 0.11 [W]. The air turbine generator is 10.6 [mm] long, 10.6 [mm] wide, and 3.6 [mm] high. Connected to a 4 [Ω] load resistor, its output power is 195 [μVA] at a rotational speed of 9000 rpm.
Design of Robust Nonlinear Optimal Controller for Underwater Vehicle to Move in Depth Channel Using Gradient Descent Method with Systematic Step Selection
Authors: Ahmadi Marzieh , Niasar Abolfazl Halvaei , Faraji Alireza , Moghbeli Hassan
Published: December 2014

This paper proposes the design of a robust nonlinear optimal controller to move the underwater vehicle in the depth channel using gradient descent method. A nonlinear model with six degrees of freedom (6-DOF) has been extracted for the underwater vehicle. To selection of the model and design of controller, conventional assumptions used for other controllers have not been considered and the developed controller can be implemented via at least assumptions. In presented control method, systematic step selection for solving of the algorithm has increased the rate of convergence significantly. The performances of the proposed robust controller for moving in depth channel with considering of parametric uncertainty for the model have been confirmed via some simulations. The results show the desirable performance of developed controller.
Optimized FOPID Control of a Single Link Flexible Manipulator (SLFM) Using Genetic Algorithm
Authors: Bensenouci Ahmed , Shehata Mohamed
Published: December 2014

This paper implements Fractional Order PID (FOPID) controller to control the rotate angle of a Single Link Flexible Manipulator (SLFM). The optimum parameters were found using Genetic Algorithm where a cost function based on the Integral Sqarred Error, ISE, index (cost/objective function) was minimized. The basic model is presented and the operating principle of the device is discussed. A control scheme to increase the system damping and improve the system response is proposed where a FOPID controller is used. To show the effectiveness of the designed controller, its responses, following divers tests, were compared to those obtained using an optimized PID with GA and using the same cost function. The results show encouragement to pursue further this research axis.
New Sliding Mode Controller Based on Second Order Reachability Law
Authors: Shehata Mohamed Ghazy
Published: December 2014

Sliding mode control systems provide robust and simple means for controlling linear and nonlinear plants whose parameters may vary within known boundaries. The existence of an ideal sliding mode requires fast switching, which induces chattering in the system, may excite high frequency plant dynamics and consequently affect the stability of the system. This paper proposes a new simple sliding mode controller based on second order reachability law. The reachability condition in this paper is based not only on the first derivative of the switching function but also on its second derivative. The proposed controller alleviates chattering, guarantees zero steady state error, and offers smooth transients for the system states. To demonstrate the validity of the proposed controller, a second order system is used as a workbench example. The simulation results of the workbench example using MATLAB illustrate the feasibility and efficacy of the proposed controller.
Control Laws Design of a Turboprop Engine
Authors: Le Brun C. , Godoy E. , Beauvois D. , Liacu B. , Noguera R.
Published: December 2014

The goal of this paper is to describe a full approach of a decentralized control strategy applied on an industrial multivariable application: a turboprop engine. A first step consists in the linearization of the turboprop engine model around different operating points. After noting strong interactions, decoupling methods are tested in order to reduce the coupling effects. A decentralized strategy is then set up, and PID controllers are further designed. The control laws are finally implemented in order to command a non-linear model of a turboprop engine.
Multiobjective Optimization of Multiloop Fractional Order PID Controller Tuned Using Bat Algorithm for Two Interacting Conical Tank Process
Authors: Lakshmanaprabu S.K. , Sabura Banu U.
Published: December 2014

Multiloop fractional order PID controller is tuned using Bat algorithm for two interacting conical tank process. Two interacting conical tank process is modelled using mass balance equations. Two Interacting Conical Tank process is a complex system involving tedious interaction. Straight forward multiloop PID controller design involves various steps to design the controller. Due to easy implementation and quick convergence, Bat algorithm is used in recent past for solving continuous non-linear optimization problems to achieve global optimal solution. Bat algorithm, a swarm intelligence technique will be attempted to tune the multiloop fractional order PID controller for two interacting conical tank process. The multi objective optimized multiloop fractional PID controller is tested for tracking, disturbance rejection for minimum Integral time absolute error.
Modular Design Approach for Model-Based Drive Control Systems on Reconfigurable Logic
Authors: Frick Florian , Zahn Peter , Lechler Armin , Verl Alexander
Published: December 2014

Architectures based on reconfigurable hardware, notably FPGAs, are an emerging trend in signal processing applications. For industrial control systems, the benefits of this technology, real parallelization combined with flexibility, offer a great potential. Regarding drive controls, reconfigurable hardware can be used to implement sophisticated control loops for which state of the art processor-based platforms are not performant enough. This capability was verified using FPGA-based prototyping systems, providing easy to use development processes.However, to date, no standard industrial drive control utilizes and benefits from this technology. A key factor for this is that besides the design of the control loop itself, its integration into a drive control system is crucial for industrial use, including functional, process, communication and safety aspects. While available tools are focused on the control loop implementation, the latter requirements are not currently fulfilled.In the context of the presented research, a new module-based approach was developed, providing a holistic solution for all the requirements. Thereby, the design of a control loop is based on basic blocks which not only provide the mathematical functionality, but also features to fit into a drive control system. Furthermore, a drive control architecture providing a flexible design space is presented, in which the modular approach can be used.
Acoustic Noise Reduction of BLDC Motor Drive Using One-Cycle Current Control Strategy
Authors: Moghbelli Hassan , Niasar Abolfazl Halvaei , Kashani Ehsan Boloor
Published: December 2014

Torque ripple and resulted acoustic noise and vibration are the main disadvantages of brushless DC (BLDC) motor drives. In this study, One-Cycle Control (OCC) is developed for current regulation of brushless DC (BLDC) motor drive as a unified constant-frequency integration control strategy. Employing one-cycle control strategy reduces high frequency torque ripple of conventional hysteresis current controllers leading to lower acoustic noise and vibration in the drive. To enhance reliability and reducing drive cost, an improved rotor position estimation technique is implemented. OCC strategy and sensorless method are realized using a low-cost general-purpose AVR microcontroller (Atmega8). It is shown that torque ripple, acoustic noise and vibration are reduced via OCC method comparing to conventional hysteresis control strategy. Computer simulations and experimental results with a 375W, 16 poles BLDC motor, demonstrate improved behavior of developed sensorless BLDC drive operation.
The Effect of Induced Vibration on Thermoplastic Composite System
Authors: Al Ghamedi Mohammed , Kjerengtroen Lidvin , Kellar Jon J. , Cross William M. , Thomas Selvin P.
Published: December 2014

Thermoplastic composite manufacturing is often difficult due to high viscosity of the matrix materials. Coupling a high level of mechanical properties with simple, low-cost processing technique is a difficult subject, but an important task for any state-of-the-art impregnation processes. In this paper, Thermoplastic Prepreg Fabrication Technology is utilized to prepare thermoplastic tapes and the technology's effect on strain energy absorption was investigated. The tape was prepared under three categories: first, with induced vibration and no fiber preheat (NV), second, without vibration and fiber preheat (HN) and last, with both fiber preheat and vibration (HV). For the purpose of comparison, all other variables such as pulling speed, fiber tension, fiber preheat and processing temperature were kept constant. The HV category showed improvement in the strain energy absorption by 10 and 23% when compared to HN and NV, respectively. In addition, HV had better wetting, fiber spread and dispersion. Fiber preheating is important as it worked well with vibration possibly due to good fiber spread on the HV category (widest tape). Also, HV had the least fiber volume fraction as it takes more matrix volume when exiting the die plate.
A Cost Effective Implementation of a Voice Assisted Home Automation System
Authors: Bharathi B. , Chatterjee Sidhartha
Published: December 2014

Home Automation Systems are mainly targeted towards people with physical difficulties for movement. The proposed Voice Assisted Home Automation System (VAHAS) enables one to control all electrical equipment and peripheral devices by means of just one’s voice. By means of interfacing the devices (which could include lights, televisions, air conditioners and so on) with the Linux powered main device running our software, via RF enabled switches, the system responds to the user’s voice commands and intelligently activates, deactivates and changes the state of the appliances. The paper elucidates the actual implementation of a low cost device and shows the results produced by the system. Scalability and customer accessibility of the system is also considered during design.
Novel ANFIS Based Control for Solar Energy Heliostats
Authors: Freeman Joshua , Kiranlal E.U. , Dharmana Meher Madhu
Published: December 2014

Solar central receiver or "power tower" thermal energy systems demand high precision heliostat tracking. Large numbers of heliostats in the field need to precisely track their own targets. Such a scenario suggests a hierarchical control architecture in which a model based controller could occupy the supervisory level. A novel two-level control architecture consisting of the NREL SPA (Solar Position Algorithm) and ANFIS (Artificial Neural and Fuzzy Inference System) as supervisory control is presented. The ANFIS system offers reduced complexity and allows for the quick simulation of various heliostat geometries without solving the kinematics. The initial system design, simulation and tracking results using Matlab SimMechanics and Simulink are given here.
A Study of Cross-Sectional Imaging of a Specimen with Gamma Transmission Tomography System
Authors: Kedit J.
Published: December 2014

This paper is a study of cross-sectional imaging of a specimen with gamma transmission tomography system. The aim of this paper is to create the cross-section image of a warhead specimen with the gamma transmission tomography system for inspection the air gaps, cracks find them from the specimen. The compositions of specimen are including cylindrical steel , steel balls ,rubber and plaster. The steel balls are formed in the cylindrical steel and explosive is replaced by plaster. Two holes and a rectangle shape are formed in the plaster. The results from cross-section image from the reconstruction shows holes but the thin rectangle shape is invisible.
Research on Mobile Internet for Smart Power Consumption
Authors: Zhang Su Xiang , Zhang Dong , Li Bo
Published: December 2014

In this paper, research on mobile internet for smart power consumption had been completed; To encourage consumers to participate in peak-shifting, various devices and technologies have been deployed on customer premise, such as interactive terminals, data gathering equipments, load control devices, visualization technology, the interactive service platform and technical support platform etc. These measures have brought out major achievements. In Beijing, Shanghai, Nanchang and Yinchuan, through an empirical study for power consumption in the different cities, experiment showed that mobile internet for smart power consumption could reduce load difference, and smooth load curve, which can improve operation efficiency of power grid and relieve pressure of energy shortage due to the participation of consumers.
Contribution to Bridge Damage Analysis
Authors: Moussaoui Mohammed Lamine , Kibboua Abderrahmane , Chabaat Mohamed
Published: December 2014

Structural damage detection has become an important research area since several works [2] were focused on the crack zones detection in order to foresee the appropriate solutions. The present research aims to carry out the reinforced concrete bridge damage detection with the finite element mathematical model updating method (MMUM). Unknown degrees of freedom dof are expanded from measured ones. The partitioned system of equations has provided a large sub-system of equations which can be solved efficiently by handling sparse matrix algorithms at each time step of the finite time centered space FTCS discretization. A new and efficient method for the calculation of the constant strain tetrahedron shape functions has been developed [1,3,4,5,6]. The topological and analytical geometry of the tetrahedron and its useful formulae enabled us to develop its shape functions and its corresponding finite element matrices. The global finite element matrices and sparse matrix computations have been achieved with a calculus source code. The reinforced concrete mixture has been modeled with the mixture laws [16] which led to its material properties matrix as an orthotropic case with 9 constants and 2 planes of symmetry from the generalizedHooke’slaw [1]. It is noticed that the material is made of steel, cement, gravels, sand and impurities. The data computations have been implemented with optimized cpu time and data storage using vectorial programming of efficient algorithms [11,12]. The sparse matrix algorithms used in this study are: solution of symmetric systems of equations UTDUd=R, multiplication, addition, transposition, permutation of rows and columns, and ordering of the matrices representations. All the sparse matrices are given in row-wise sparse format.
Real-Time Predictive Analytics, Big Data & Energy Market Efficiency: Key to Efficient Markets and Lower Prices for Consumers
Authors: Schmidt Benjamin , Flannery Patrick , DeSantis Mark
Published: December 2014

The combination of evolving deregulation of the US and EU energy markets together with recent advances in data analytics and so called 'Big Data' technologies now offers an unprecedented opportunity for optimal real-time energy pricing for buyers and sellers alike. The main challenge to date for optimal pricing has been optimal real-time bidding and variety of traditional data analysis tools have been applied to this challenge. Yet inefficiencies remain due to the volatile nature of the real-time market. Energy data science is the best solution to protect consumers against the electricity market's inefficiencies. This field is the meeting point between computer programming, machine learning, big data, quantitative analysis and economics. Energy data science is used to help the consumer predict what price they should offer to buy at each hour and closes gaps in the electric markets.
Privacy Preserving Reputation Based Medical Services Scheme Using a Variant of ElGamal
Authors: Angolo Shem Mbandu , Gabriel Kofi Armah , Xu Chun Xiang , Kamenyi Domenic Mutiria
Published: December 2014

Reputation Based schemes are gaining popularity in all spheres of the service industry. In this paper, we have proposed a privacy preserving secure reputation based medical services system. This system enables Medical Users to get a reputation score of a Medical Service Provider before engaging in any services. This kind of approach ensures that the Medical User has some apriori information of the quality of service to expect from a Medical Service Provider. Our proposed scheme uses a variant of the ElGamal cryptosystem. It is privacy preserving in the sense that both the Medical User making the query and the Medical Service Provider remain anonymous throughout the process. Compared to other reputation based schemes our scheme offers more security services than most existing schemes.
Optimization of District Heating Consumption Using Random Heating Scenario Generator
Authors: Alhaj Hasan Ola , Defer Didier , Shahrour Isam
Published: December 2014

This paper proposes a new method to optimize the control of the heating system of a district in a way that fulfills the thermal regulations and comfort in the whole district from one side and guarantees the minimization of the energy consumption (and bill) from the other side. This new method depends on coupling buildings with different functionalities and needs. A heating plan for the coupled entities will be generated afterwards. This plan makes advantage of the difference in occupation timing of the buildings and has as constraints the thermal comfort of the occupants and the maximum available energy. This heating plan takes into consideration the building inertia to design the supply plan and maintain the constraints.
Experimental Research on Performance of Electrochemical Machining Process on Hard Material (Carbon Steel EN9) and Soft Material (Copper)
Authors: Panchal Ankit , Patel Amit , Sheth S. , Joshi Anand
Published: December 2014

Electrochemical Machining is one of established non-traditional machining process which is widely used in micro machining parts. Purpose of this research paper is to investigate effect of Electrochemical Machining under low voltage and relatively high current rating on concentrated or masked work piece of Copper and Carbon Steel EN9. Developing Machine set up with the help of PLC and SCADA device for Accurate Positioning and reliable data supervising which includes ECM, basic working principle of ECM, selection and development of components, implementation and to analyze the effect of change in the parameters of the process. Selection and development part will cover design of frame, fixture, pump, filter, tool, electrolyte, and work piece material as a mechanical part, selection of electric drive system and PLC. PLC programming and hardware circuit as electrical and programming part.
Wear Behavior in Wire of Wire Cut EDM
Authors: Sen Ruma , Charkraborti P. , Debbarma J.
Published: December 2014

Wire electrical discharge machining (WEDM) is a specialized thermal machining process, capable of accurately machining parts with different hardness, complex shapes and sharp edges that are very difficult to be machined by the traditional machining processes. The practical technology of the WEDM process is based on the conventional EDM sparking phenomenon utilizing the widely accepted noncontact technique of material removal.In this paper, the effects of various process parameters of WEDM like pulse on time (Ton), peak current (IP), wire feed (WF) and wire tension (WT) have been investigated to study their impact on wear of wire of ELECTRONICA SPRINTCUT WEDM machine.It is found that the wear is influenced with increase in pulse on time (Ton) and wire tension.
Estimation of Thermal Effect of Ground Moisture Condensation on Heat Transfer outside Geothermal Borehole
Authors: Vasilyev G.P. , Peskov N.V. , Brodach M.M. , Lichman V.A. , Zakharov P.E. , Yurchenko I.A.
Published: December 2014

This article contains the results of theoretical research carried out with financial support from the Ministry of Education and Science of the Russian Federation (contract ID RFMEFI57914X0026) and demonstrates the need to consider the changes in ground heat transfer properties in geothermal borehole heat modeling, due to moisture condensation/evaporation in the ground pores. In GSHP systems design, the quantity of the boreholes is often overestimated and the associated parameters oversized while the extent of the ground heat transfer is underestimated. This is due to the incorrect assessment of the ground moisture content, which affects the ground heat transfer properties. This article presents the mathematical simulation of the ground pore moisture condensation at the GSHP boreholes. Also presented is numerical data derived from the calculations to assess the effect of the ground pore moisture condensation on the borehole heat transfer efficiency.
Modeling of Droplet Generation by a Modified T-Junction Device Using COMSOL
Authors: Lei Lei , Zhang Hong Bo , Bergstrom Donald J. , Zhang Bing , Zhang Wen Jun
Published: December 2014

This paper presents a numerical study of the formation of droplets in a novel two-dimensional T-junction device by using a commercial CFD package: COMSOL Multiphysics. Numerical simulations were carried out for different flow conditions. Different flow rates lead to four regimes: continuous flow, droplet generation, detached, and stalled. The capillary number of the cross-flow turns out to be the key factors in the droplet generation process. The simulation results are validated by comparison to the existing experimental data.
Vibration Forecast and Vibration Attenuation Research of the Finished Motorcycle Based on Virtual Analysis
Authors: Meng Zi Qing , Li Ming
Published: December 2014

as the high-speed vehicle, motorcycle vibration has an important influence on driving security, comfort, and handling stability. Therefore, this article builds the finite element analysis model of vibration forecast and damping of the finished motorcycle based on the structural characteristics. The major contents include main part modeling, boundary condition, and the finite element model of the finished motorcycle. In the paper, we build the finite dynamic response equation through analyzing the dynamic response, and research the resonance from different directions that caused by the engine harmonic response. Moreover, this article provides the vibration attenuation plan of the motorcycle structural modification and proves the feasibility through the analog computation and experimental measurement.
Thin-Shell Silk Cocoon (TSC) as a Nitrogen Source of ABE Fermentation by Clostridium acetobutylicum
Authors: Kittithanesuan Natshera , Phisalaphong Muenduen
Published: December 2014

A thin-shell silk cocoon (TSC), a residual from the silk industry, was used as an alternative nitrogen (N-) source in ABE fermentation by Clostridium acetobutyricum ATCC 824. The experimental studies were performed in batch fermentation at 35 °C and pH 5.0. The results were compared with the system using yeast extract (YE) as N-source. It was shown that TSC fragments (TSCf) could be used as a cheap substitute for YE for a certain amount. Under optimum conditions, total solvent of 22.3 g/L (12.7 g/L butanol, 8.0 g/L acetone and 1.5 g/L ethanol) was obtained from the ABE fermentation using the mixture of TSCf and YE as N-sources. The ABE productivity and conversion yield were 0.15 g/L/h and 0.30 g/g sugar consumption, respectively.
Discussion of Modern Machinery Production Technique and High Precision Machining Technology
Authors: Xu Jiu Nan
Published: December 2014

This paper mainly researches the modern machinery production technique and high precision machining technology, which carries out the elaboration to the digital design and manufacturing technology, the advanced production mode and the automated manufacturing systems in the modern machinery manufacturing technology; it also introduces several common high precision machining technology, including: high precision cutting technology, ultra precision grinding technology and molding technology, in order to help promote the development of the modern machinery production technique and improve the high precision machining technology.
Design and Application of Electromechanical Brake System
Authors: Liao Xiao Mei
Published: December 2014

Aim at the brake fluid system cannot protect the automobile security effectively, this article analyzes the electromechanical brake system in details. At first, it introduces the theory and the advantage composition of the electromechanical brake system. Then, this article introduces the hardware of EBS system and evaluates the design of EMB electrical machine and electron pedal. At last, it particularly analyzes the system software. This article has significant meaning to the automobile maintainers and the braking system researchers.
The Parametric Design of Scissors Lifting Platform Based on SolidWorks and Optimization Analysis
Authors: Jiang Wen Chao , Zhao Xiu Yun , Cui Huan Yong , Li Chang Chun
Published: December 2014

In order to achieve parametric design of the various components and parametric assembly of scissor lift platform, this paper describes SolidWorks secondary development technology which is based on C# and application ACCESS database technology which is for parameters storing of various parts. Parametric design is achieved by programming code. Finally, to achieve light-weight design ,we use the finite element method to optimize the size of the model structure.
Simulation Mathematical Model of Heating by a Multichannel СO2-Laser
Authors: Morozov Valentin , Zhdanov Alexey , Shlegel Alexander , Ivanchenko Alexander
Published: December 2014

This article focuses on the development and validation of a mathematical model that describes the interaction between radiation and thermal processes multi-channel СО2-laser with cast iron. The proposed model is based on experimental and numerical results obtained by the authors and allows the selection of rational modes of laser thermo strengthening for multichannel СО2-lasers.
Hardware Design of Bipedal Locomotion Robot
Authors: Sim K.S. , Tso C.P. , Lim G.Y. , Foo M.C.
Published: December 2014

This paper aims to design and develop a control system for the biped robot. The Peripheral Interface Controller (PIC) main controller board is designed to control the servo motor controller board which assures the biped robot to maintain its stability. This robot consists of PIC microcontroller, servo controller, servo motor, and sensors. The bracket parts are fabricated to mount the servo motors by constructing the biped structure. The PIC microcontroller provides interface among the sensors input, servo motor controller, and servo motor. The biped robot is able to walk in a stable motion under a flat plane. The sensors feedbacks enable the controller to adjust the stability of biped robot. The biped robot is able to perform walking steps and crouching action through the configuration of trajectory angle values of the servo motors.
A Study of Kurtosis-Based Dictionary-Diagnosis Method against Switch-Current Circuit Faults
Authors: Zhang Zhen , Duan Zhe Ming , Long Ying
Published: December 2014

For the purpose of solving the problem of diagnosing the Switched current circuits’ fault,a location algorithm based on information kurtosis was proposed.Data acquisition board or ASI-Z software was used to gather the data of the fault circuit output terminal.Then information Kurtosis of the Switched current circuit time domain response was calculated.Finally fault dictionary was built to classify faults.The location algorithm was simulated in a practical circuit.The results show that the location algorithm is use to simplify the structure of fault dictionary,and classify the faults,and it is applicable to diagnosising switch current circuit fault.
Research on the Voltage Sensitivity of Differential Cymbal Piezoelectric Vibration Acceleration Sensor
Authors: Gao Hui , Li Deng Hua , Dong Bi Zheng
Published: December 2014

To improve the sensor's output voltage sensitivity, two cymbals piezoelectric transducer are employed as the sensitive elements to form a differential cymbal piezoelectric vibration acceleration sensor. The structural features of the sensor are analyzed, second-order system mathematical model is established and the output voltage sensitivity of the sensor is also studied. The experimental results show that output voltage sensitivity of differential cymbals piezoelectric vibration acceleration sensor is two times of that of the sensor with single cymbal transducer. The experimental data agrees well with the theoretical analysis result.
A Reactive Power Control Strategy Based on Power Correction in the Process of Voltage Restoring
Authors: Peng De Hui , Cui Peng Fei , Wang Zhen
Published: December 2014

For the defect Guizhou-Guangdong II ± 500kV HVDC System can not configure filter in accordance with the voltage-mode, which may lead to excessive voltage of AC system, even appear cutting filter due to AC voltage limiting. This paper presents a power adjusting strategy in the process of voltage recovering, based on the character that consume of reactive power converter valve changes with DC voltage. With dynamic functional test and system test, the strategy cuts filter rationally, solving the overvoltage problem of AC system in the process of voltage recovering. It also simplifies the reactive power control strategy.
Calculation of Temperature Rise for High-Voltage Induction Motor with Compact Type in Starting Process
Authors: Meng Da Wei , Zhang Bo Qun , Shi Xiao Xuan
Published: December 2014

Medium-sized high-voltage motor’s starter temperature rising is difficult to accurately calculate. In this paper, the heating and cooling process at the start of the motor windings are analyzed, from the perspective of practical engineering, according to the actual structure of the motor, the motor drag establish a network model and dynamic thermal network diagrams, calculating the electrical heating and cooling conditions. This paper took consideration of the influence to the motor heating from current and impedance changes in the process of starting. Taking the times as the step size and basing on the raw heat and heat capacity of each period to calculate the motor temperature rise of the motor windings. For example the motor of YJKK500-4, 2500kW motor, calculating the motor winding temperature raise, the calculation which achieved with the experimental results, the calculation method has the engineering practicality.
Piezoelectric Beam Length Optimization for Raindrop Energy Harvesting Application
Authors: Wong Chin Hong , Dahari Zuraini , Manaf Asrulnizam Abd , Miskam Muhamad Azman
Published: December 2014

The vibration energy harvesting from raindrop is an interesting and potential approach for future applications. This article presents the piezoelectric based beam length optimization for raindrop energy harvesting application. In this work, polyvinylidene fluoride (PVDF) is selected as piezoelectric material. The characteristics and performances of the beam are experimentally investigated. It includes investigation on the impact of water droplets with 4.3 mm diameter, released from 0.25 m heights at various lengths of PVDF beam. The width and thickness of the beam are fixed to 4 mm and 25 μm respectively. Results showed that the optimized length which is 30 mm is possible to generate peak voltage up to 8.5 V.
Integrated Split Heat Pump System for Building Applications
Authors: Nizetic Sandro , Gizdic Roko , Yadav Ankit , Bugarin Miro
Published: December 2014

In this paper, a design of a specific hybrid energy system is elaborated for small scale applications in building facilities of residential or commercial purpose. The energy system is assembled from existing market available technologies that include implementation of a heat pump technology, photovoltaic system and of a standard accumulation boiler for the preparation of hot water. The developed energy system is assumed to be used in mild climates where a heat pump system can be efficiently used throughout the year. According to the gained experimental results the coefficient of the performance for the cooling mode can be expected between 5.0 and 6.0, which prove that the proposed system is highly energy efficient. The developed energy system can cover both cooling and heating demands and also demands for domestic hot water and it represents a totally renewable energy system.
Vegetalized Complex Partition (VCP): Impact of a Green Roof under a Humid Tropical Climate, Comparison between Hong Kong and Reunion Island
Authors: Jean Aurélien P. , Libelle Teddy , Miranville Frédéric , Medina Mario A.
Published: December 2014

The aim of this paper is to present the experimental results of a specific vegetated complex partition (VCP) and discuss the conclusions found from an interesting study case in Hong Kong, especially the presence of a strong upward heat flux in winter.
The experimented VCP configuration has never been tested in Reunion Island. It is located on a small scale building with a sloped roof covered with steel foil and under a humid tropical climate.
From March to August, the extensive VCP reduced the global average heat flow by 91.61% and the ceiling temperature by 9.3°C, with a maximum average reduction of 18.9°C at noon.
Compares to the results from Hong Kong, three of the four conclusions have been observed or deduced from the experimented VCP's results. The fourth conclusion (about heat flow loss in winter) has not been observed. But, based on the results, a precision of the explanation of its origin is proposed: the evaporation process act like a heat loss amplifier.