17 Articles Published

1. VARIATION OF THERMAL CONDUCTIVITY OF POLYSTYRENE INSULATION MATERIAL UNDER DIFFERENT OPERATING TEMPERATURES AND MOISTURE CONTENTS

Authors: MAATOUK KHOUKHI

Abstract: Utilizing thermal insulation in the building envelope, in harsh climates, will considerably reduce the heat gain through the envelope of the building and consequently its energy consumption. The performance of thermal insulation material is mainly determined by its thermal conductivity (k), which describes the ability of heat to flow cross the material in presence of gradient of temperature. In practice, the k-value is normally evaluated at 24°C (i.e., k24) according to relevant ASTM standards. Actually, the thermal insulation materials when used in building envelope are exposed to significant and continuous temperature change. Moreover, the material moisture content, which is influenced by the ambient humidity level, may significantly affect the k-value of the insulation material. The main objective of this paper is to investigate the effect of the operating temperature and the moisture content on the thermal conductivity of various densities of polystyrene insulation material, which

Keywords: component, formatting, style, styling, insert

Pages: 1 - 5 | DOI: 10.15224/978-1-63248-045-3-37

2. FINITE ELEMENT MODELLING OF DIFFERENT 2D RE- ENTRANT STRUCTURES OF AUXETIC MATERIALS

Authors: MOZAFAR SHOKRI RAD , ZAINI AHMAD

Abstract: Auxetic materials exhibit a unique characteristics when subjected to uniaxial loading. Various structures have been used to model these materials. Among most important auxetic structures, re-entrant structures are of interest in this present study. These structures have different shapes in which are known as lozenge grids, sinusoidal ligaments, square grids, double arrowhead, and structurally hexagonal re-entrant honeycomb could be named. In this paper, finite element approach for the abovementioned structures was employed to obtain basic mechanical properties including Poisson’s ratio and elastic modulus. The study aims at investigating the effect of cross sectional geometry on mechanical properties. For each structure, three different cross sectional geometries were numerically examined. It is evident that mechanical properties of the material could be controlled by changing the geometry of the cross section. The primary outcome of the study is the design guideline on the effect of c

Keywords: auxetic; finite element; cross section; re-entrant, Poisson’s ratio, elastic modulus

Pages: 6 - 9 | DOI: 10.15224/978-1-63248-045-3-38

3. INVESTIGATION OF SINGLE SLOTTED CYLINDER PLACED IN A FIN TUBE HEAT EXCHANGER MODEL

Authors: BESIR SAHIN , HUSEYIN AKILLI , SEDAT YAYLA , SUAT ONAL , SULEYMAN TEKSIN

Abstract: The flow characteristics of inline and one slotted cylinder placed in a fin tube heat exchanger model are experimentally investigated using Partical Image Velocimetry (PIV) for Reynolds numbers of 1500 and 4000. In this study, the Reynolds number is calculated based on the cylinder diameter. Qualitative flow visualization was initially employed in order to observe the overall nature of the vortical flow patterns of cylinders. The flow interactions in the streamwise bases of the cylinder with a flat plate surface results in two dimensional vorticity <>, streamline topology <> and velocity vector map behavior.

Keywords: confined flow, vorticity, staggered cylinders, slot cylinders

Pages: 10 - 15 | DOI: 10.15224/978-1-63248-045-3-39

4. KNOWLEDGE-BASED DERIVEN MANUFACTURING SYSTEM (KDMS) FOR INJECTION MOLDING

Authors: CHIA-YAN TSENG , SHIA-CHUNG CHEN , WEN-REN JONG , YUNG-HSIANG CHANG

Abstract: The global manufacturing development faces the new challenges including waste of resources, short delivery time, labor cost increase, short of labor, etc.. As a result, the overall industry environment of plastic materials manufacturing turns to focus on automatic production that enables manufacturing industry entering into the next phase so that production efficiency, man-made errors, and labor shortage can be improved. In this study, a cloud based platform of knowledge-driven manufacturing system integrates science bases and practical experience of injection molding with remote control technology that can enhance traditional production efficiency in several aspects such as production guidance in design/tooling/molding phases, production scheduling for all working members and equipment and processing monitoring via internet. More important is that during each working stage, sufficient knowledge are provided and guiding/driving the design/manufacturing work. The new knowledge/data are

Keywords: Intelligent, Knowledge-driven, Cloud

Pages: 16 - 20 | DOI: 10.15224/978-1-63248-045-3-40

5. SMALL-HYDRO FLOODGATE AUTOMATION USING INDUCTION GENERATOR IN ISOLATED OPERATION

Authors: ALEXANDRE VIANA BRAGA , ANGELO JOSE JUNQUEIRA REZEK , AUGUSTO NELSON CARVALHO VIANA , EDSON DA COSTA BORTONI , VALBERTO FERREIRA DA SILVA , WALTER DENIS CRUZ SANCHEZ

Abstract: A system designed to protect against generator under-voltage or overvoltage, through the use of an automatic hydraulic floodgate in a micro-hydro power plant, using induction generator in a stand-alone operation, was implemented in a micro-station hydroelectric power 30[kW]. The proposed system uses 24[V] batteries in a circuit and these are always kept ready using a battery charger, designed especially for the microstation operation. The time of descent and the gate rise time, are approximately one minute and a half. Tests were performed for the operation of the gate. The proposed protection system was robust, efficient, simple and reliable.

Keywords: Induction generator; voltage control, ballast load, floodgate automatic operation

Pages: 21 - 25 | DOI: 10.15224/978-1-63248-045-3-41

6. FREQUENCY CONTROL OF INDUCTION GENERATOR IN STANDALONE OPERATION USING BYNARY LOGIC

Authors: ALEXANDRE VIANA BRAGA , ANGELO JOSE JUNQUEIRA REZEK , VALBERTO FERREIRA DA SILVA , DELVIO FRANCO BERNARDES , GETULIO RIBEIRO MARQUES , JOSE CARLOS GRILO RODRIGUES , LUCAS HENRIQUE SIMOES

Abstract: This paper presents a study for the solution to the problem of stability of the steady state frequency of a generator connected to a load, by using a binary logic control. The active power flowing in the load, influences the machine generated voltage frequency. In the present study, an induction motor has been used as generator machine. To ensure that this frequency remains constant against variation of loads, a ballast load will be used, the power of which is controlled by using a binary logic

Keywords: Induction generator, frequency control, binary logic, ballast load

Pages: 26 - 30 | DOI: 10.15224/978-1-63248-045-3-42

7. A FRAMEWORK FOR SIMULATION-DRIVEN ENGINEERING DESIGN

Authors: YOEL TENNE

Abstract: The modern engineering design process often employs computer simulations to evaluate candidate designs. This setup transforms the design process into an optimization problem which involves a computationally-expensive black-box function, namely, which lacks an analytic expression and where each function evaluation requires large computational resources. An additional challenge in such settings is that simulation runs may consistently fail for some specific candidate designs, but with the reason for failure being unknown. To effectively handle such challenging problems this paper proposes an engineering optimization framework which incorporates a classifier whose goal is to predict if a candidate design is likely to result in a failed simulation run. This prediction is then used to dynamically divert the optimization search away from such designs, without sending them to the simulation. Numerical experiments based on an airfoil optimization problem show the effectiveness of the proposed

Keywords: engineering design optimization, computer simulations, metamodels, classifiers

Pages: 31 - 35 | DOI: 10.15224/978-1-63248-045-3-43

8. NUMERICAL AERODYNAMIC ANALYSIS OF A NEW TWIN ENGINE COMMUTER AIRCRAFT LONGITUDINAL AND LATERAL-DIRECTIONAL DERIVATIVES

Authors: AGOSTINO DE MARCO , CORCIONE SALVATORE , DELLA VECCHIA PIERLUIGI , NICOLOSI FABRIZIO

Abstract: This paper deals with numerical investigation about both longitudinal and lateral-directional static aerodynamic characteristics of a new twin-engine commuter aircraft with eleven seats, Tecnam P2012. Numerical analyses have been performed on complete and many partial aircraft configurations in order to evaluate the contribution of each aircraft component and to estimate their mutual interferences. The analyses have been conducted at wind tunnel Reynolds number in order to provide a validation of the numerical investigation. Finally numerical analyses have been also performed at free flight conditions, in order to have an estimation of the Reynolds number effect in especially on the aircraft base drag coefficient and on the wing span loads in both flap up and flap down conditions.

Keywords: CFD, Longitudinal and Lateral-Directional Stability, CommuterAaircfra

Pages: 36 - 40 | DOI: 10.15224/978-1-63248-045-3-44

9. ASSESSMENT OF WIND TURBINE GRID CONNECTION REQUIREMENTS IN TURKEY

Authors: B. KEKEZOGLU , M. E. HACIBEKIROGLU

Abstract: The use of distributed power generation systems in power systems is increasing day after day. Despite the contribution they make to the energy needs of these systems, they can also have adverse effects on the grid. Therefore, specific constraints are brought to the grid connection of the distributed energy systems and governments constitute legislations depending on their grids. In this study, available grid connection conditions for the wind turbines in Turkey have been presented and discussed by comparing these criteria with the similar ones around the world.

Keywords: wind power, power systems, grid connections criteria

Pages: 41 - 44 | DOI: 10.15224/978-1-63248-045-3-45

10. VISCOSITY CONTROL FOR EXTRUSION PROCESSES USING RECYCLED POLYMERS

Authors: ALAN CLARKE , BAO KHA NGUYEN , GERARD MCNALLY

Abstract: The aim of this paper is to develop a new extruder control system for recycled materials which has ability to automatically maintain constant a polymer melt viscosity of mixed recycled polymers during extrusion, regardless of variations in the Melt Flow Index (MFI) of recycled mixed grade high density polyethylene (HDPE) feedstock. A closed-loop controller is developed to automatically regulate screw speed and barrel temperature profile to achieve constant viscosity and enable consistent processing of variable grade recycled HDPE materials. The experimental results of real time viscosity measurement and control using a 38mm single screw extruder with different recycled HDPEs with widely different MFIs are reported in this work.

Keywords: viscosity, control, extrusion, recycled polymers

Pages: 45 - 49 | DOI: 10.15224/978-1-63248-045-3-46

11. 1D AND 0D ADVANTAGE MATERIALS APPLICATION ON TCO SURFACE ON DYE SENSITIZED SOLAR CELLS

Authors: HALIL IBRAHIM YAVUZ

Abstract: Semiconductor metal oxide nanowires (SCMONWs) are favorable materials for various quantum devices which have one dimensional interaction and huge surface-to-volume ratio. Growth of these nanowires is commonly performed using expensive techniques requiring high vacuum and high temperature conditions, which also consume some hazardous raw materials. However, the sol-gel technique employed in this study is used primarily for the fabrication of materials including metal oxides beginning from a wet chemical solution, where low temperatures and non-vacuum conditions are utilized. Indium tin oxide (ITO) is generally used as a transparent conducting oxide for solar cells and LCD, touch screens applications. In this work, indium tin oxide (ITO) nanoparticles, nanowires and thin films are prepared on glass substrates by solgel technique and used for the production of nano-crystalline dye-sensitized solar cells (nc-DSSC), which are a relatively new class of low-cost thin film solar cells. Structu

Keywords: Solar cells, Dye, sensitized, solar, cell, Advantage, materials, nanotechnology, nanomaterials, energy

Pages: 50 - 54 | DOI: 10.15224/978-1-63248-045-3-81

12. DIRECT CURRENT TRACTION POWER SYSTEM ANALYSIS IN ELECTRICAL RAILWAY SYSTEMS

Authors: MUGDESEM TANRIOVEN , IBRAHIM SENGOR , YUSUF BASEGMEZ

Abstract: Todays, urban transportation began to get more importance because of increasing rates of urbanization and the traffic problems. Therefore, railway systems have started to play a key role in urban transportation with technological development because of rapid transit, less carbon emission, low ratio between the energy consumption and transport capacity. In this study, the grid and DC traction power supply system of a subway which is the widespread urban electrical railway systems has been modeled by using MatLAB Simulink. Electrical analysis was carried out of the subway line according to the variable load and different line distance.

Keywords: traction, power, railway, transportation, energy

Pages: 55 - 59 | DOI: 10.15224/978-1-63248-045-3-82

13. DESIGN AND SIMULATION OF AN ELECTROMAGNETIC SHOCK ABSORBER

Authors: JAE-SUNG BAE , JAI-HYUK HWANG

Abstract: The present study proposed an electromagnetic shock-absorber (EMSA) consisting of a copper and steel combined tube, a piston, permanent magnets, and a steel ring. A magnet fixed on the piston moves through the tube when driven by an external shock. This shock energy is partially dissipated by an eddy current damping force and a friction force generated from the relative motion of the magnet and the tube. A part of the energy is stored in a magnetic spring consisting of two magnets. To predict the performance of the proposed EMSA these damping and magnetic forces are simulated and approximated by using an electromagnetic finite element program. The present simulation results are verified by the experimental results.

Keywords: Electromagnetic, Shock, Absorber, (EMSA), Eddy, Current

Pages: 60 - 62 | DOI: 10.15224/978-1-63248-045-3-83

14. CALCULATION OF RECEPTANCE OF A STRUCTURE MODIFIED BY MASS AND GROUNDED SPRING

Authors: ORHAN CAKAR

Abstract: The dynamic properties of an existing structure are altered, when a mass and/or a spring are added to or removed from the structure. Therefore it is important to know dynamic properties of the structure after modification. One way to determine dynamic properties of the structure is the experimental modal analysis which uses measured Frequency Response Functions (FRFs). In the present study, a general and exact method is presented based on the Sherman-Morrison formula in order to calculate FRF of the structure modified by concentrated mass and grounded spring. The method is very effective and uses only a few FRFs related to modification coordinates of the un-modified structure.

Keywords: Structural, modification, frequency, response, function, receptance, natural, frequency, Sherman, Morrison, formula

Pages: 63 - 67 | DOI: 10.15224/978-1-63248-045-3-84

15. MONITORING JOURNAL BEARING USING ACOUSTIC EMISSION (AE) TECHNIQUE

Authors: R.I. RAJA HAMZAH , S.HUSIN

Abstract: This paper presents the measurement procedures and the results of the Acoustic Emission (AE) assessment on ID Fan journal bearings. Vibration data were also acquired in an effort to compare the sensitivity of both techniques in detecting incipient failures. Series of Acoustic Emission (AE) and vibration measurements have been undertaken on the selected journal bearings for ID fan at power plant. AE and vibration statistical parameters were calculated from the collected raw data in an effort to compare the sensitivity of both techniques in detecting incipient failures. The purpose of the measurements is to evaluate the capability of AE system in detecting incipient failures in journal bearing. This report details the measurements procedures undertaken and the results of this assessment.

Keywords: ernational, Conference, Advances, Mechanical, Automation

Pages: 68 - 68 | DOI: 10.15224/978-1-63248-045-3-85

16. PLANNING OF THE EXPERIMENTATION TO EXAM DEVIATIONS IN PARAMETERS OF MACHINE/MECHANICAL TAPS

Authors: DETELINA ANGELOVA , STEFAN KARTUNOV

Abstract: This article is studying the market portfolio analysis of GWG in Gabrovo, Bulgaria. We present the work drawings of taps M4, M6, M8, M10 and their variations, the tolerances of their dimensions We have planned the test of number ofexperimentations and the factors to be examined.

Keywords: Experimentation, machine, taps, dimensions, tolerances.

Pages: 69 - 73 | DOI: 10.15224/978-1-63248-045-3-130

17. DEMAND RESPONSE FOR SMART HOME: AN EVALUATION FROM AN END-USER’S PERSPECTIVE BASED ON A HIGH RESOLUTION POWER DEMAND MODEL

Authors: EFRAIN BERNAL , JIAN XIE , MUSTAFA SUSLU

Abstract: This study investigates customer response to demand response with direct load control at the smart home by implementing home energy management HEM algorithm. An economical evaluation is done to estimated the benefices from the user’s perspective. Initially, this study outlines the development of a high-resolution smart home power demand model with the trends in photovoltaic PV, home automation systems, efficient appliances and battery support, to estimate the potential impacts of demand response programs on the residential load profiles. Finally, the results show highly annual and daily variations on the demand load profile for fixed tariff scenarios up 44% with respect to the current demand profile. Consequently, in the case of TOU rate tariff scenarios, a critical variation for the peak and off-peak transition period was found. This variation goes up 64% with respect to the current demand profile pattern and 80% with respect to the smart home demand profile pattern. Additionally in c

Keywords: home, automation, HEM, smart, home, demand, response.

Pages: 74 - 79 | DOI: 10.15224/978-1-63248-045-3-143