bluuebunny/crossref_metadata_2025 huggingface dataset:
The Neural Network Control Algorithm Research of Single Crystal Furnace Temperature System
Authors: Song Xin , Li Ming Yu , Li Li , Yang Chao
Published: September 2013

Straight pull single crystal furnaces temperature control system has problem of the long time lag and nonlinearity, so the precise mathematic mode that is hard to build. Advanced control strategies show strong advantages for resolving these problems. This paper use artificial neural network modeling approach to establish single crystal furnace temperatures neural network control BP structure model, use adaptive method to control the temperature of the single crystal furnace.
The Analysis of the First Order Bending Stiffness of Vehicle Body in Different Loading Conditions
Authors: Qiu Fei Li , Zhang Li Min , Zhang Wei Hua , Sun Xian Liang
Published: September 2013

The first order vertical bending mode of vehicle and its stiffness are very important to the dynamic characteristics. A high-speed vehicle body was selected to study on, the differences of the sections stiffness features were considered, with the unknown sections geometry sizes, mass and mass distribution. Under the different load, the first order bending stiffness of the seven sections and the equal bending stiffness of the vehicle body was calculated only using the modal test data. The result was validated by the tested mode frequency. The research showed that the sections upon air-spring have lower stiffness, and the rice loading on the vehicle body would reduce the vehicle body bending stiffness. However, the middle section stiffness would increase with fixed number of passengers on the vehicle.
Study on the Improvement Method of Water Exchange Rate for Shuidong Bay Using Numerical Model
Authors: Yao Shan Shan , Xie Ming Xiao
Published: September 2013

Using a numerical model based on the hydrodynamics and advection-diffusion equation, the water exchange capability of the Shuidong Bay was firstly simulated, then the water exchange rate of three regualation scenarios were calculated through the concentration variation of dissolved conservative tracer. The calculated results show that the water exchange rate of the Shuidong Bay is only about 65% after 30d under current condition.When bay was dredged to bottom elevation-3.0m, the water exchange rate can greatly increase to 88% after 30d. However, the water exchage rate has not significantly increased or even decreased after further dredging. Through comprehensive comparison, it is suggested to dredge the Shuidong Bay, and the dredging bottom elevation of-3.0m is the most suitable.
The Delamination Realize and Simulation Control of War Unit in Operation Simulation Software
Authors: Yu Xue Yong , Zhu Qing Hao , Li Ben Jiang
Published: September 2013

it is the key point in simulation project design that how to delaminate and realize the war units and how to control them, this embodies the structure, the efficiency, the expandability of a system. This article explains a simulation design idea and realize procedure which sort the war units in an efficiency way, and a simulation control method called MAL.
A Blind Watermarking Algorithm for 2D CAD Drawings Based on SVD
Authors: Jiang Xue Mei , Li Bo , Zhang Xiao Mei
Published: September 2013

A blind watermarking algorithm for 2D CAD drawings based on singular value decomposition (SVD) is presented. In this paper, the handles of lines are sorted to rule out additional entities and relative vertex coordinates are divided into small matrixes for larger watermark capacity. Then, quantization modulation is used to embed watermark so it can be extracted without original drawings. The experiments show that the proposed algorithm has good invisibility, larger watermark capacity and is also robustness to various geometric and entity addition attacks.
An Approach to Website Structure Optimization Based on Navigation Cost
Authors: Liu Cong
Published: September 2013

Website structure was described as an un-weighted digraph. The concept of website navigation cost as a measurement scale to evaluate the optimization degree of the website structure was presented. Based on the ideas of semantic similarity and information entropy, a quantification model of the website navigation cost was built up. And an improved Path Tree Spanning Algorithm was proposed to construct all the access paths of the website. Case study shows that the approach introduced in this paper can not only bring the new ideas and methods to the website structure optimization, but also provide further support for the website designers to develop optimization design of the website.
Efficiency of Dynamic GOP Length in Video Stream
Authors: Ling Zi , Jiang Xing Jun , Liu Jian Jun
Published: September 2013

Multiple description codes are designed for multiple path video streaming with channel diversities and an efficient MDC technique based on the applied spatial domain processing features. In this paper, we investigate the performance of multi-path video streaming using a multiple description coding (MDC) technique, especially the impacts of several codec variables, such as different lengths of the Group of Pictures (GOP), and the different startup times of I-frame in each independent MDC sub-streams. The overall performance of the system is evaluated by the frame dropout rate, which indicates the probability of playing back frozen frames of the reconstructed video at the receiver devices. To address dynamic channel conditions for video transmissions, we propose an adaptive coding technique by adjusting the GOP lengths according to the channel condition and combinatorial mathematics optimization in length of GOP adjustment. Different approaches, such as sub-dividing GOPs for a single stream and multiple sub-streams, and an adaptive MDC video streaming system, are examined in this paper.
Analysis of the Remote Emergency Care in Wartime
Authors: Zhao Wen Dong , Zhang Feng Quan
Published: September 2013

This paper firstly describes the medical information with the rapid development of new medical reform, with the popularity of the 3G network, the mobile remote emergency custody has gradually developed in all the country.Then for the usual remote emergency cares business processes were introduced, and describes the function about remote emergency care business in the ambulance, first aid center and the hospital side, leads to the emergence care in the wartimes significance is larger than it in normal. For remote wartime emergency care, analyses from the first aid center, ambulance and first aid scene, the scene PAD terminal and hospital.Finally concluded that need to enhance related functionality and roles of the wartime remote emergency care, for meet the high requirements of wartime emergency care, 3G high-speed networks, telecommunication security encryption, integrated multi-system, data standards harmonization is a highly efficient and reliable for the wartime remote emergency care.
The Application of Internet of Things in Crop Production Management Research
Authors: Sun Kai Meng
Published: September 2013

The composition, solution, method and design idea of crop information acquisition device applying internet of things were introduced. The applications of internet of things in crop production research were explained, and several technological difficulties and methods were discussed. Meanwhile, the effect and significance of applying internet of things in relevant disciplines of agricultural production were demonstrated.
Meter Reading Concentrator Software Design and Implementation Based on Linux
Authors: Hou Si Zu , Zhang Xiao Xu , Wu Hui
Published: September 2013

This article describes a Linux-based meter reading concentrator software design; include software module division and the main task flow. In this paper, the optimization of the concentrator software and Linux systems integration, improve the concentrator software system reliability, portability and scalability.
Network Video Retrieval Technology Analysis and Research
Authors: Wang Kun , Hu Ying
Published: September 2013

On the basis of network application, the content-based video retrieval processes and the relevant algorithms and implementation techniques are analyzed in this paper. According to the characteristics of the network video, the comprehensive color and shape features of retrieval technology is put forward. Then from the perspective of network applications, the distributed video database retrieval system architecture design is given. This paper has carried on the comprehensive analysis at the aspect of the system database structure and the network structure, combined with the three-tie network system structure, in the network application environment, how to realize the content-based video retrieval technology has carried on intensive study and discuss.
Friction Factors of Oilfield Water Injection Network - Calculating Cases Analysis
Authors: Yu Zhong Chen , Ma Dong , Wang Song , Zhang Xue Jiao
Published: September 2013

Firstly, possible pipe combination, that needs to give friction factor value, is found by orthogonal experimental method. Then friction factor sensitivity of pipe section is analyzed in the possible pipe combination by sensitivity analysis, supplementary boundary conditions is gotten, friction factor value of every pipe is given according to solving analogical node equation method. At last, Case study showed that the method is true and better in result matching and convergence rate aspect. The approach is a theoretical guarantee to network design and optimal analysis of oilfield water injection network, and has a specified engineering significance.
The Study on Circular Tool of Ultrasonic Cutting
Authors: Zhang Yun Dian , Fang Liang , Lu Zhi Ping , Yu Jia Ying
Published: September 2013

The ultrasonic cutting of composite materials has the advantages such as high processing efficiency, high precision and non-pollution. The working principle of ultrasonic cutting is studied. The structure of circular tool is designed. The differential equation of tool frequency is established. The resonance frequency of tool is solved. Modal analysis is conducted for circular tool through ANSYS and the results are compared through tests.
Friction Factors of Oilfield Water Injection Network - Research on Solving Approach
Authors: Wang Song , Ma Dong , Yu Zhong Chen , Zhang Xue Jiao
Published: September 2013

Oilfield water injection network is a special network, where all pressure and flow rate of node is known. Using empirical friction factor value formerly leads to great deviation between optimal result of network and fact operating condition, because of small pipe diameter, severe scale and lots of valves, which is difficult to guide Oilfield production. Firstly, possible pipe combination, that needs to give friction factor value, is found by orthogonal experimental method. Then friction factor sensitivity of pipe section is analyzed in the possible pipe combination by sensitivity analysis, supplementary boundary conditions is gotten, friction factor value of every pipe is given according to solving analogical node equation method.
Research on Layered Resource Discovery Model in Grid
Authors: Zhu Bo , Zhong Luo , Yang Li
Published: September 2013

Firstly, a Layered Resource Discovery Model (LRDM) was proposed in this paper according to different resource type in grid. Then all components of LRDM were analyzed and designed in detail with resource discovery module in Globus Tookit4, mainly including resource description, resource information organization and resource request processing. Finally, the model was implemented and proved to have the characteristics high discovery efficiency and scalability because of combining the advantages of both centralized and distributed mechanisms.
The Algorithm of Network User Identification Based on Digitized Persona
Authors: Li Su Duo , Li Ying Xing , He Yan Ping
Published: September 2013

Persona is a virtual describe of some similar users. It plays an important role in product development and web design, etc. Persona is always described in narrative form such as words and photos. This paper provides a new method of describing persona with digitization, which is to record and analyze users behavior features in real time through the interaction of browser and server, and calculate the user's persona accordingly. So it will give a rapid and exact estimate in user identification and user clustering, etc.
Key Technologies of Cloud Computing Model
Authors: Hsu Li Fu
Published: September 2013

Could computing is a new type of computing mode, it distributes computation task on the resource pool which consists of massive computers, so the application systems can obtain the computation power, the storage space and software service according to its demand. The understanding of cloud computing is developing and changing constantly, cloud computing still has no unanimous definition. This paper describes three main service forms of cloud computing: SAAS, PAAS, IAAS, compared the definition of cloud computing which is given by Google, Amazon, IBM and other companies, summarized the basic characteristics of cloud computing, and emphasized on the key technologies such as data storage, data management, virtualization and programming model.
WN-LEACH: A Weighted Residual Energy Based Cluster-Heads Selection Algorithm for Wireless Sensor Network
Authors: Bao Xi Rong , Xie Jia Hua , Li Shuang Long
Published: September 2013

This article focused on the energy limit property of Wireless Sensor Network, and proposed a residual energy based algorithm WN-LEACH, with the classic network mode of LEACH routing algorithm. The algorithm combines the proportion of residual energy in the total energy with the cumulative number of the normal nodes supported by the cluster heads as a cluster selection reference. In order to balance the energy consumption of each cluster-head, the algorithm took both the different positions of the base station and the initial energy of the network into consideration, and weighted the two factors to balance the energy consumption between transmitting the signals and data fusion. Simulation results show that the algorithm can promote the lifetime of the uneven energy network and does not impair the effects of the LEACH algorithm.
An Implementation of Ant Colony Optimization Algorithm Using Java
Authors: Xu Long Xi , Qiao Shan Ping
Published: September 2013

Ant colony optimization algorithm is a very important one among swarm intelligence algorithms. Because Java is an advanced object-oriented and platform-independent computer programming language, in order to use this algorithm in a platform-independent and flexible way, this paper introduces a Java-based implementation package of it. This package includes some sub-packages. There are several classes which are all implemented in Java using object-oriented technology in each sub-package. Users can utilize these classes on computers installed the corresponding Java runtime environment to solve some problems. After the test on two travelling salesman problems, these classes performed properly and efficiently, and the good effect was received.
A Webpage Ranking Algorithm Based on Collaborative Recommendation
Authors: Zhang Shao Xuan , Liu Tian
Published: September 2013

In view of the present personalized ranking of search results user interest model construction difficult, relevant calculation imprecise problems, proposes a combination of user interest model and collaborative recommendation algorithm for personalized ranking method. The method from the user search history, including the submit query, click the relevant webpage information to train users interest model, then using collaborative recommendation algorithm to obtain with common interests and neighbor users, on the basis of these neighbors on the webpage and webpage recommendation level associated with the users to sort the search results. Experimental results show that: the algorithm the average minimum precision than general sorting algorithm was increased by about 0.1, with an increase in the number of neighbors of the user, minimum accuracy increased. Compared with other ranking algorithms, using collaborative recommendation algorithm is helpful for improving webpage with the user interest relevance precision, thereby improving the sorting efficiency, help to improve the search experience of the user.
Sensorless Control of PMSG Wind Turbine Using ANFIS
Authors: Janarthanan A.D. , Venkatesan L. , Muruganandam G.
Published: September 2013

This paper deals with the control of permanent-magnet synchronous generator (PMSG) where the rotor position and speed estimation is essentially required to operate it on maximum power points. Here, Adaptive Neuro Fuzzy Inference System Technique (ANFIS) is used to estimate the speed and position of PMSG, where an ANFIS-system is continuously tuned with actual value of PMSG. The proposed system consists of a back-to-back converter, where PMSG side converter has MPPT output and another one is used for grid synchronization. The generator side ANFIS estimator is used to estimate the rotor position and speed accurately over a wide speed range. The purpose of grid side ANFIS estimator is to control and manage the inverter according to the load demand and storage of electricity in battery which is coupled with dc link of back to back converter respectively. The stored electricity in battery is fed back to grid when needed. The proposed system is designed in MATLAB/SIMULINK.
Design and Modeling of Photovoltaic System Fed Brushless DC Motor
Authors: Pandikumar M. , Ramaprabha R. , Muthu Ranganath
Published: September 2013

The objective of this work is to make a study of the photovoltaic generator and converters used to supply a brushless DC machine actuating a centrifugal pump. This will be carried out by modeling and simulation of the various stages that constitute the overall system, which includes the photovoltaic source, the maximum power point tracker and the three-phase inverter with the space vector modulation scheme The simulation has been carried out using MatLab-Simulink and the results are presented for different operating conditions.
Performance Evaluation and Exhaust Emission Analysis of a CI Engine Fuelled with Pongamia Pinnata Biodiesel and its Blends
Authors: Miraculas G. Antony , Bose N.
Published: September 2013

Biodiesel usage is gradually becoming popular around the world because of their low environmental pollutants. The properties of biodiesel and its blend were compared with that of diesel. The study reviled that the performance of the engine with 20% PPME gives better performance than that of diesel at part load. The performance for other blends where slightly lesser than that that of diesel. The BSFC of biodiesel was slightly higher than that of diesel due to its lower calorific value. CO and HC emissions were found lesser for biodiesel and its blend compared with that of diesel, whereas NOx emission was found somewhat higher than that of diesel.
Investigation of PMSG Fed Diode-Clamped Multilevel Inverter for Wind Energy System
Authors: Sankar A. Bharathi , Seyezhai R.
Published: September 2013

Wind energy has drawn worldwide attention because of its simple structure, high efficiency and stable operation. Recently, variable speed constant frequency (VSCF) direct-drive wind power generation system using permanent magnet synchronous generator (PMSG) has gained popularity. This paper focuses on the simulation of PMSG fed diode clamped MultiLevel Inverter (MLI) for wind applications. A three-level MLI with phase disposition PWM technique has been proposed. Simulation studies on the proposed scheme have been carried out in MATLAB and spectral quality of the output has been investigated.
Experimental Investigation of Nano Particles Blended with Water on Solar Flat Plate Collector
Authors: Sivakumar P. , Raj W. Christ , Malathi N. Jaya , Balamurugan R.
Published: September 2013

Heating of water for domestic purpose by making use of solar energy is essential and it is one of the effective ways of utilizing solar energy. Initial cost of solar water heating (SWH) system is high, but the operation cost is zero. This paper discusses on improving the performance of a flat plate solar energy collector by changing the design parameters of the number of riser tubes and the arrangement of riser tubes in zig-zag pattern from the existing flat plate collector system (FPC) and using the different working nanoparticles with base fluids like aluminium oxide mixed with water. Experiments were conducted using copper tube in headers and risers with two different configurations and maintain the same dimensions. The performance comparison was made for all the two types of collectors in closed loop. The performance shows that the efficiency of FPC with zig-zag arrangement of tubes (Z-Configuration) is higher than that of conventional FPC. Thus the newly presented FPCs system produces higher efficiency than the existing conventional flat plate collector system.
Spray Characteristics of Diesel and Biodiesel in Direct Injection Diesel Engine
Authors: Raghu P. , Thilagan K. , Thirumoorthy M. , Lokachari Siddharth , Nallusamy N.
Published: September 2013

Alternative fuels for diesel engines are becoming important due to the decrease of petroleum reservoirs and the increase of environment pollution problems. The biodiesel is technically competitive with conventional petroleum-derived diesel fuel and requires no changes in the fuel distribution system. Injection process of biodiesel influences the atomization and dispersion of fuel in the combustion chamber. In diesel Engine different tests have been performed to improve the efficiency in cycle, power, less emission, speed, etc. There are various methods of visualizing the combustion chamber in a Diesel engine. For visualizing spray characteristics of combustion chamber in Diesel engine the window of 10mm diameter hole, transparent quartz glass materials are used, which can with-stand 1500°C temperature and pressure of about 1000 bar and engine is hand cranked for conducting the experiments. Spray characteristics of palm oil methyl ester (POME) and diesel were studied experimentally. Spray penetration and spray angle were measured in a combustion chamber of DI diesel engine by employing high definition video camera and image processing technique. The study shows the POME gives longer spray tip penetration and spray angle are smaller than those of diesel fuels. This is due to the viscosity and density of biodiesel.
Experimental Study on the Spray Characteristics of Diesel and Biodiesel (Jatropha Oil) in a Spray Chamber
Authors: Raghu P. , Mukilan Michael S. , Viswanath R. Bharath , Krishna S. Audithya , Nallusamy N.
Published: September 2013

The increasing industrialization and motorization of the world has led to a steep rise for the demand of petroleum-based fuels. Petroleum based fuels are obtained from limited reserves highly concentrated in certain regions of the world i.e. those countries that lack these resources are facing energy crisis. Hence it is necessary to look for alternative fuels which can be produced from resources available locally within the country such as biodiesel, alcohol and vegetable oil. The biodiesel is technically competitive with conventional petroleum derived diesel fuel and requires no changes in the fuel distribution system. For this reason and its biodegradability, use of biodiesel is considered a good alternative of fossil fuels. Injection process of biodiesel influences the atomization and dispersion of fuel in the combustion chamber. In this research work the influence of biodiesel on injection process and their impact on the air-fuel mixture preparation are studied. Spray characteristics of biodiesel (Jatropha oil) and diesel under various injection pressures were studied experimentally. Spray penetration and spray angle were measured in a spray vessel using a high speed video camera. The study shows the biodiesel gives longer spray tip penetration and spray angle are smaller than those of diesel fuels. The parameters like break up time and break up velocity were for biodiesel and diesel at various injection pressures. It was found that breakup time for biodiesel increases and breakup velocity decreases. Breakup velocity of biodiesel is less than diesel, this is due to higher sound velocity, density, viscosity and bulk modulus of biodiesel. High viscosity fuel suppresses the instabilities required for fuel jet to breakup and thus delays atomization and reduces fuel losses during injection. With the increase in fuel injection pressure, the breakup time for biodiesel is more than diesel, this is due its larger surface area of the spray and larger mixing time of biodiesel than diesel.
Performance and Emission Characteristics of Low Heat Rejection Diesel Engine Fuelled with Rice Bran Oil Biodiesel
Authors: Arunkumar G. , Santhoshkumar A. , Vivek M. , Raman L. Anantha , Sankaranarayanan G. , Dhanesh C.
Published: September 2013

In this study, the performance and exhaust emissions of a biodiesel fuelled low heat rejection (LHR) direct injection Diesel engine have been investigated experimentally and compared with the results of standard diesel engine without any coatings. Piston, cylinder head, exhaust and inlet valve of test engine were coated with 0.5 mm thickness of zirconia through plasma spray method. Biodiesel used in the testing was prepared from rice bran oil through transesterification process.
Estimation of Energy and Carbon Saving Potential in Industrial Lighting System
Authors: Ganesan P. , Rajakarunakaran S. , Thirugnanasambandam M. , Devaraj D.
Published: September 2013

A targeted energy analysis was carried out in a textile industry focusing on lighting system. It is observed from the study that the industry can replace the existing TL-D 36 W/54 fluorescent tube lights with energy efficient TL-5 28 W/865 fluorescent tube lights with electronic ballast. This has resulted in energy saving of 206388 kWh per annum. The corresponding CO2 mitigation is estimated at 167.174 t CO2/annum. An experiment was conducted to identify the exact light intensity of the proposed lighting system. The result shows that the light intensity has reduced by 11.1 % which is insignificant compared to energy saving and CO2 mitigation. The investment for the new lighting fixtures is estimated at INR 0.468 million with cost saving of INR 1.65 million which has return on investment of just 3.3 months.
Mitigation of Power Quality Problems Using DSTATCOM with Reduced DC Link Voltage
Authors: Saranya T.L. , Ezhilarasan G. , Dash Subhransu Sekhar
Published: September 2013

This paper mainly presents the DSTATCOM (Distribution Static Compensator) and its control methodology of DC capacitor voltage. Generally, the dc capacitor voltage is regulated using a PI controller where various control algorithms are used for load compensation. Whenever there is a change in load there is considerable variation in dc capacitor voltage which might affect compensation. In this work, a supervisory method is proposed to reduce the dc link rating. The reduction in dc link voltage leads to the reduction in switching frequency and hence switching losses A considerable reduction in the in dc link capacitor voltage is obtained without compromising the compensating capability. The major power quality issues discussed in this work are harmonics and power factor reduction. The performance of the proposed strategy is proved using the detailed MATLAB simulation studies.
Mitigation of Power Quality Issues by Adaptive Current Hysteresis Band Controller Based Shunt Active Filter
Authors: Chellammal N. , Velmurugan V. , Dash Subhransu Sekar , Abirami R.
Published: September 2013

This paper proposes a shunt active filter to mitigate the power quality issues like unbalanced load current during nonlinear load. The proposed shunt active filter is constructed with the combination of cascaded H-Bridge multilevel inverter for achieving reduced %THD along with multiband hysteresis controller for accurate tracking of the reference signal followed by switching pulse generation for the MLI. The time domain based SRF controller is utilized for precise estimation of the reference signal. To authenticate the dynamic performance of the proposed shunt active filter, a test system is modeled in MATLAB / Simulink.
Speed Control of Induction Motor via Pic Controller Using Lab View
Authors: Venkatesan L. , Janarthanan A.D. , Aarthi P.R. , Arulmozhiyal R.
Published: September 2013

This paper gives an overview on Speed control of Induction Motor via Pic Controller using Lab VIEW. For Monitoring and controlling the Induction motor speed we can use the Lab View Simulation software. Lab VIEW Software can be used for continuous monitoring in an Real Time System applications. Most of the Industrial Automation control process are done by Lab VIEW software only. Lab VIEW Software plays major role in Industrial Monitoring and control systems. There are various types of controller used in Drive control systems in order to perform some actions such as Speed control, Run Motor in both forward and reverse direction. Here we have used Pic Controller for speed control process. From Lab VIEW software we can send Signals to Pic Controller to Run Induction Motor in either Forward/Reverse Direction and we can set the Speed of the Motor.
Transient Stability Improvement with Unified Power Flow Controller Using Fuzzy Logic and ANFIS Approach
Authors: Latha S. , Rani C. Kala
Published: September 2013

Transient stability is an important aspect in planning and operation of an electric power system. The application of Fuzzy logic and Adaptive Neuro Fuzzy Inference System (ANFIS) approach to power system problems has received increased attention in recent years. This paper investigates the fuzzy logic based Unified Power Flow Control (UPFC) methods namely in-phase voltage control and quadrature voltage control in improving transient stability of power system using energy function method. The potential of the two control methods in transient stability enhancement is identified in Single Machine Infinite Bus System (SMIB) system. UPFC is connected in SMIB system in middle of the transmission line. Results indicate that significant reductions in the transient swings are obtained with UPFC. The result shows that the transient stability margin is substantially improved with in-phase voltage control higher than the quadrature voltage contro1.
Stability Improvement in Power Systems Using Unified Power Flow Controller (UPFC)
Authors: Gopinath B. , Kumar S. Suresh , Michael Juvan
Published: September 2013

Flexible AC transmission system (FACTS) is a system composed of static equipments used for ac transmission of electric energy to improve the power transfer capability and to enhance controllability of interconnected network. Unified Power Flow Controller (UPFC) is the most widely used FACTS device for providing fast acting reactive power compensation on high voltage electricity transmission network. This paper deals with the designing of Adaptive Neuro Fuzzy Inference controller (ANFIC) and fuzzy based Particle Swarm Optimization (PSO) controller for the performance analysis of UPFC. The controller have been designed and tested for controlling the real and reactive power of UPFC. Fuzzy-PI controller is used to control the shunt part of UPFC. The system response under high short circuit level is tested on 5-bus system and 118-bus system. Computer simulation by MATLAB/SIMULINK has been used to verify proposed control strategies.
Three Input DC-DC Boost Converter for Hybrid Power System with Multilevel Inverter
Authors: Narayan Jagriti , Uthayakumar R. Johnson
Published: September 2013

A new three input DC-DC boost converter fed symmetrical multilevel inverter is proposed. The converter interfaces two unidirectional input power ports and a bidirectional port to battery in a unified structure. This converter uses hybrid alternative energy source such as Photo Voltaic (PV) source, Fuel Cell (FC) source, and Battery. Supplying the output load, charging or discharging the battery can be made by the PV and the FC power sources individually or simultaneously. The proposed structure utilizes only four power switches that are independently controlled with four different duty ratios. Proposed inverter uses two cells for five level output. Boost converter provided hybrid sources to multilevel inverter. Here we promote inverter for attain a pure sinusoidal harmonics free ac application.Key Words-Photovoltaic/fuel cell (PV/FC)/battery hybrid power system, three-input dcdc boost converter.
Design and Simulation of Energy Efficient Fixed Frequency Pulse Controlled Power Converter for Induction Melting Application
Authors: Booma Nagarajan , Reddy S. Rama , Beryl M.
Published: September 2013

This paper discusses the design and simulation of pulse width modulated based circuit for induction melting application. This high frequency inverter topology have the practical advantages of energy saving, clean environment, high output power due to low switching losses, less electromagnetic noise and low total harmonic distortion. This two stage power converter has single phase full bridge rectifier, DC filter, zero voltage switching pulse width modulation controlled high frequency inverter. In this work, the steady state operation and control strategy of pulse width modulated high frequency inverter is analyzed. In order to achieve energy efficiency switching losses are reduced by operating the inverter above resonance frequency. Input side supply harmonics is also reduced using EMI filter. The simulation of the designed high frequency power supply is carried out at a frequency of 20 kHz using MATLAB simulink tool. Simulation results proof the energy saving due to reduction in switching losses of the presented control strategy and reduction in harmonic distortion of the presented power supply for induction heating load.
Effect of Working Pressure on Structural, Electrical and Optical Properties of CIGS Thin Film Deposited by PLD
Authors: Mishra Pradeep Kumar , Gautam Yogendra K. , Prasad J.N. , Choudhary A.K. , Chandra Ramesh
Published: September 2013

CuIn0.8Ga0.2Se2 (CIGS) thin films have been successfully deposited on soda lime glass substrate at different working (Ar gas) pressures by Pulsed laser deposition (PLD). The effect of working pressure on the structural, electrical and optical properties of CIGS thin films has been investigated. All deposited CIGS thin films are found to be polycrystalline in nature with preferred orientation along (112). Crystallinity of CIGS thin films has been improved with decreasing of working pressures in PLD chamber. Stoichiometry of CIGS thin films has been maintained for all working pressures. Optical transmittance and electrical sheet resistance of CIGS thin films have been found to decrease with decrease of working pressure. The results of the present study signify that desired structural, electrical and optical properties of CIGS thin films can be obtained by changing the processing parameter in PLD method.Keywords: CIGS, XRD, Stoichiometry, UV-Vis-NIR spectrophotometer.
Development of Computational Technique for Better Utilization of Renewable Energy
Authors: Kiruba R. Princelyn Jeba , Arulmozhiyal R.
Published: September 2013

The project illustrates an idea of connecting the photovoltaic systems with the Grid, GCPS. In this work, the photovoltaic source of generation, the PVG is connected to the main electric grid via two static electronic stages. The first stage contains a buck-boost dc-dc converter, insuring impedance adaptation between PVG and grid. This converter is controlled by the Fuzzy Sliding Mode controller, FSMC. The controller is used to track the dc reference voltage which is used to satisfy the main grid. The second stage is composed of a dc bus and a three-phase voltage inverter, which serves as an interface to the PVG and the grid utility. The inverter output is regulated by means of suitable filters to inject the high quality Photovoltaic, PV power into the grid. The GCPS has been implemented in the MATLAB. The performances of the fuzzy sliding controller are compared to the results obtained by a sliding mode controller. The satisfactory simulation results, reduces the phenomenon of chattering. The resulting waveforms indicate the robustness of control against variation of the load and the source voltage of the converter.
Numerical Investigations on Cutting of Dual-Phase Sheet Steel with an Emphasis on Material Damage at the Cut Edge
Authors: Peshekhodov Ilya , Schneider Matthias
Published: September 2013

With the help of an explicit finite element analysis, cutting of cold-rolled dual-phase steels for various tool clearances was studied. In the first part of the study, the influence of the element size in the shear zone of the sheet on the predicted cut edge geometry and punch force was assessed and the optimal simulation parameters were identified. In the second part, the fracture description was put into focus of the investigation. It is shown that the used mathematical description of the equivalent plastic strain at fracture as a function of the stress triaxiality does not yield accurate results for FEA-based prediction of the cut edge geometry. A need in a more accurate fracture characterisation and, possibly, a more advanced fracture description of dual-phase sheet steels and the directions of the future research are identified.
Polishing Process of Ceramic Tiles - Variation of Contact Pressure
Authors: Olenburg Anatolij , Salati Marcelo Reami , Sant´Ana Filipe , Sousa Fabio Jose Pinhero
Published: September 2013

The contact pressure is one of the most important parameter in the industrial polishing process of ceramic tiles. The contact pressure is asically a function of the elasticity moduli of both tile and abrasive tool, the applied load, and also the curvature of the abrasive tool. Due to the wear, this curvature decreases during the polishing process, causing an increase in the contact pressure. The purpose of this work is to research the influence of contact pressure on the evolution of gloss and roughness of the polished ceramic tiles and to improve the quality of generated surface. The variation of curvature was replaced with the direct increment of three different normal forces onto the abrasive tool. It is known from literature that for fine abrasive grits higher tool loads increase gloss gain and decrease roughness. However, there are not many works that research the whole sequence of abrasives for different loads and compare the quality of the final surface. Polishing tests on a laboratory scale CNC-Tribometer have been used to study the industrial polishing process for unglazed porcelain ceramic tiles. Tests were carried out for three different tool loads with a sequence of progressively smaller silicon carbide abrasive particles embedded in a magnesia cement matrix. Tile surface quality was evaluated by roughness and optical gloss. The removed work piece material and the used abrasive were measured with a coordinate measuring machine. The distribution of gloss and roughness of the tile was measured before and during the experiments until a saturation of gloss and roughness for each grit number was achieved, respectively. The topography of the tile was measured before and after the polishing process with particularly grit number. The used abrasives show a general trend of increasing gloss and decreasing roughness during the process. The coarse abrasives caused the major effect on surface roughness and almost no effect on gloss. In opposite finer abrasives caused the major gloss enhancement and almost no effect on surface roughness. The results show the evolution of roughness and gloss for each load as a function of abrasive grit number and polishing time, as well as the material removal rate for each grit number and load.
Process Window for Forming of Micro Preforms at Different Temperatures
Authors: Brüning Heiko , Jahn Mischa , Schmidt Alfred
Published: September 2013

Parts, which dimensions do not exceed the micro range are gaining more importance in today´s goods due to miniaturization and function compaction of products. Thus, fabrication methods for these special, very small parts attract notice because whole processes or at least process parameters cannot be transferred into micro range. Nevertheless, this does not necessarily mean, that size-effects are always detrimental as there are some processes which can only be carried out in micro range such as the laser-based micro upsetting process. The basic characteristics of this process are presented in this paper such as its self-aligning capability. Due to the fact that the maximum achievable upset ratio in single stage upsetting decreases with decreasing sample size, the material accumulation represents a very good semi-finished product (preform) being formed in a succeeding upsetting process. A temperature- and time controlled forming unit has been developed which is directly adapted to the laser system which is required to generate the preform. Thus, either a pre-defined temperature of the preform or the down time gives the initial signal to start the forming process. In this paper, a mathematical model is very briefly presented to determine the process window for forming preforms at certain well defined temperatures regarding size-effects.
Sheet-Bulk Metal Forming of Symmetric and Asymmetric Parts
Authors: Salfeld Valerian , Krimm Richard , Hübner Sven , Matthias Thorsten , Vucetic Milan
Published: September 2013

The unique process of sheet-bulk metal forming (SBMF) represents a combination of sheet and bulk metal forming by inducing a three-dimensional material flow in sheet metals in a single forming stage. Within this paper two different applications of sheet-bulk metal forming are demonstrated. Hereby two different combined drawing and upsetting processes to realize parts with symmetrically and asymmetrically arranged functional elements are analysed. Finally, this contribution introduces a new machine technique which provides an improvement of the working accuracy of a forming machine and thus has a positive influence on the parts quality. The idea is to use electromagnetic ram guidance to counteract the displacement of the ram due to horizontal forming forces while forming of asymmetric parts.
Competence-Based Communication Design in Factories
Authors: Reinema Christian , Luebkemann Jens
Published: September 2013

Purpose and problem. Today, business organisations are facing turbulent markets that are characterised by an increasing individualisation of products and customer specifications. This desire for individualisation leads to a growing number of complex tasks to fulfil requirements. Those tasks require very different competencies that exceed the competencies and the knowledge of a single person. As a result, many people within the company have to work together to meet the requirements of the market and the customer and to be able to react fast on changes. For that to happen, the employees need to exchange a lot of information efficiently. Additionally the need to communicate effectively increases while working together, so there has to be an environment that supports efficient and effective communication processes.
Linked Energy Systems for Production Sites of the Future
Authors: Beck Martin , Sielaff Tilo
Published: September 2013

Industrial enterprises are increasingly driven to tap the potentials of energy efficiency in existing and future production sites. The challenge is to identify cost-efficient levers for a low energy demand in the linked energy system of production machines and peripheral devices. Considering enabling technologies for energy efficiency and energy recovery in a cascaded energy network with energy storages this paper presents an approach towards energy and cost-efficient system configurations for production sites. An outlook will be given on the research center eta-factory for energy efficient factories at the PTW, TU Darmstadt.
Gamification in Management Decisions: Judging Global Production Networks in a Cyber-Physical Way
Authors: Potente Till , Varandani Rawina , Prote Jan Philipp
Published: September 2013

The judgment of global production networks is facing three major challenges. The complexity, measurable through the huge solution space, as well as the time-consuming preparation of a decision in line with the limited amount of time of the final decision makers – CEOs and upper management. The experience from several industry projects showed the demand to transfer and apply the concept of gamification in a cyber-physical environment to decision-making in Global Footprint Design. Smart IT tools, which support the intuition and practical knowledge of the decision maker but do not finally make the decision for them, are needed. Based on general criteria for successful gamified IT tools three specific requirements for judging global production networks are derived: value creation, ludic goal orientation and autonomous discovery. The major challenges and these specified principles of gamification are addressed within the scope of an IT tool which simplifies and improves complex global footprint decisions by employing elements of gamification. It is analysed to which degree the criteria are already fulfilled, which benefits this prototype of a gamified IT tool can offer and what future research has to be conducted in order to fully let CEOs game their global footprint strategy.
Planning and Simulation of High-Voltage Energy Storage Assembly for Automotive Industry - from Scalable Product Concepts via Assembly Planning and Material Flow Simulation through to Web-Based Assembly Information
Authors: Bönig Jochen , Fischer Christian , Brandmeier Markus , Mersdorf Thorsten , Braun Thomas , Mrugalla Claudia
Published: September 2013

Driven by the demand for green mobility alternatives and the claim to reduce the carbon footprint, technologies for electric mobility are on the advance. Although the idea of using electricity as drive energy came up more than 150 years ago, a considerable potential of development still remains. The automotive industry is in the midst of a time of transition, in which business may change fundamentally in order to meet the upcoming conditions.
A High Resolution Surface Model for the Simulation of Honing Processes
Authors: Joliet Raffael , Kansteiner Michael
Published: September 2013

The demand for highly resistant surfaces is driven by the requirement for resource efficiency and rising environmental concerns. Finishing processes like long-stroke honing for the machining of boreholes of chuck components make it possible to create surfaces with favourable tribological properties. Since variations of process parameter values have complex effects on the resulting workpiece topography and its characteristic values, many experiments might be necessary to achieve certain properties. To avoid this, a simulation-based approach has been developed that relies on a high resolution model of the tool and the workpiece. For its calibration and validation, systematic investigations of a honing process and the machining parameter values have been conducted, and the measured surfaces are compared to the computed workpiece topographies.