bluuebunny/crossref_metadata_2025 huggingface dataset:
Properties of the Lower Bohl Exponents of Diagonal Discrete Linear Time-Varying Systems
Authors: Niezabitowski Michał
Published: September 2015

The Bohl exponents, similarly as Lyapunov exponents, are one of the most important numerical characteristics of dynamical systems used in control theory. Properties of the Lyapunov characteristics are well described in the literature. Properties of the second above-mentioned exponents are much less investigated in the literature. In this paper we show an example of two-dimensional discrete time-varying linear system with bounded coefficients for which the number of lower Bohl exponents of solutions may be greater than dimension of the system.
The Dipole Magnets Temperature Monitoring and Interlocking Protection System of HIRFL-CSRm
Authors: Yin Jia , Li Li Li , Wang Yan Yu
Published: September 2015

HIRFL-CSRm is a heavy ion synchrotron, named the main Cooling Storage Ring of Heavy Ion Research Facility of Lanzhou. Its role is to cool and accumulate the injected low energy ion beam, and then accelerate to high energy and extract. So, requirements for performance and safety of the magnet which directly affect the intensity and stability of ion beam is very high. This paper mainly state temperature monitoring and interlocking protection for the dipole magnets of HIRFL-CSRm to protect magnets, reduce the economic loss, and ultimately ensure safe running of HIRFL.
Development of a Cloud Based Remote Mobile Monitoring and Control System for Manufacturing
Authors: Yao Albert W.L. , Lin R.T.
Published: September 2015

The purpose of this study is to develop a remote mobile monitoring and control system for manufacturing factory by using the cloud computing technology and information and communication (ICT) technology. In conjunction with the cloud and ICT technologies and mobile devices, modern manufacturing systems can be integrated to promote competitive strength to transmit the information and control commands toward the remote monitoring systems instantly via mobile devices. In such a way, this remote system could enhance the efficiency of information flow and the competitive strength and add unknown value to industries. This study adopts the cloud and ICT technologies as the main communication media to develop a remote monitoring and control system with smart mobile devices. The results of this study show the successful integration of the intelligent mobile devices and cloud networks for manufacturing system.
On PID-Controller Parameters Neural Tuner Usage for Nonlinear Plants Control
Authors: Eremenko Yuri , Poleshchenko Dmitry , Glushchenko Anton , Fomin Andrey
Published: September 2015

The problem of a control system efficiency increasing for nonlinear plant control is considered. It is shown that proposed neural tuner based on neural networks is an efficient approach to solve the problem of PID-controller parameters online tuning. The backpropagation method is used to train the network. This method is modified by adding a rule base containing conditions on choosing learning rate for neurons. Experiments are made for plant models with various parameters values (with a time constant about 103 seconds and 101 seconds). The required quality for each transient is determined. The system with the neural tuner allows to achieve 10% decreasing of the amount of time and 9% of energy-savings in comparison with the conventional PID-controller.
Application of Taguchi Method Machining to CuA1
Authors: Ibrahim M.R. , Abdullah Aznizam , Ab Kadir A.R. , Sulaiman S.
Published: September 2015

This paper is to study the application of Taguchi Method when experimental cutting on Copper (CuA1) generated by a milling machine. The respone of this study is surface roughness while machining with varying machining parameters such as cutting speed, feed rate and depth of cut. This experiment is using end mill HSS Ø16mm with uncoated and 2 flute with sequences of experiment base on the Taguchi Orthogonal array L934 which carry out with 9 of experiments. The signal-to-noise (S/N) ratio, the analysis of variance (ANOVA) and confirmation tests with the optimal levels of machining parameters are carried out in order to illustrate the effectiveness of the Taguchi optimization method.
Investigation of Wind around Buildings of Different Heights Using an Environmental Wind Tunnel
Authors: Elhakeem Mohamed , Sattar Ahmed M.A.
Published: September 2015

This study presents experiments conducted in an environmental wind tunnel using physical models to quantify the airflow field around array of buildings of two different heights. A complex airflow pattern was developed around the buildings. In addition, the tall buildings increased the turbulence level around the short buildings. Combining short and tall buildings increased the spatially averaged velocity and standard deviation around the short buildings by 25% compared to the velocity and standard deviation around buildings of the same height. Thus, the proposed buildings arrangement and spacing proved to be effective in improving the wind environment around the buildings.
Evaluation of the Use of a Solar Source for Air Conditioning for Home in Algeria
Authors: Rebah N. , Benyoucef B.
Published: September 2015

Today's global environmental problems, such as global warming, destruction of the ozone layer, degradation of air quality and their implications for human health have become a major concern for the environment, residential areas as well as our living conditions. Numerous research studies were devoted to address these topics due to their crucial importance. The purpose of this study is to develop and improve the bioclimatic architecture of residential housing according to the Algerian energy policy. We have calculated the reduction of housing energy consumption for air conditioning and hot water by replacing the system which is based on fossil fuels (oil and gas) by the newly proposed architecture which is based on renewable solar energy. This is being conducted for three different sites within Algeria. We carried out an explorative economic comparison of the two systems. Based on experimental results, the proposed system proved to be able to cover more than 55% of the total electricity needs for air conditioning. Therefore, this shows the potency of reducing the electricity utility bill up to a half with much better expected results for southern regions of Algeria.
Heating or Cooling Buildings with PV Walls in Reunion Island
Authors: Bigot Dimitri , Miranville Frédéric , Guichard Stéphane , Lebon Edouard , Jean Aurélien
Published: September 2015

In Reunion Island, many buildings have been equipped with PV panels on their roofs in order to produce electricity. These PV systems were built to increase the penetration of renewable energies in the public electricity grid and so reduce greenhouse effect gases emissions. This type of installation was designed just in order to produce electricity but many works have shown that PV systems integrated to walls can also cool or heat the buildings. This paper presents how PV systems integrated to building can be used to help meeting energy needs in two microclimates of the island by cooling or heating the building where it is installed. To show this, a building simulation code able to model BIPV buildings is used.
Applying P-Diagram in Product Development Process: An Approach towards Design for Six Sigma
Authors: Enoch Olalere Folasayo , Shuaib Ab. Aziz , bin Hasbullah Abu Hassan
Published: September 2015

Successful business enterprises are to a great extent determined by strong sales and overall low operational cost; as a result, improving quality and reducing cost have been one of the important tasks for any business enterprise. These will help in achieving high quality products at reasonable price. Thus, due to the effectiveness of Six Sigma in improving quality and reducing cost, it has become an excellent initiative that is gaining momentum in the business world. However, academics have conducted little research regarding this phenomenon, especially on it applicability in manufacturing industries. Therefore, this paper seeks the knowledge regarding how P-Diagram Model (Taguchi Method) can be applied in product development stage to achieve Design for Six Sigma (DFSS). The paper illuminates on “Process” as the basic unit for Six Sigma and how production process can be enhanced using P-diagram. Following this understanding, the paper demonstrates how P-diagram can be applied in conceptualizing and developing product ideas that put into consideration users intent (User-centred design), reduce variations and thus, lower the risk of product failing.
Design of Experiment – An Integration of Fisher, Taguchi and Shainin DOE Methodology
Authors: Kowang Tan Owee , Long Choi Sang
Published: September 2015

Design of experiment (DOE) is the focal collective of quality technique and is widely used in Research and Development (R&D) organization to optimize product design parameters. There are three main DOE approaches that commonly adopted by R&D companies, which are the classical Fisher’s DOE, Taguchi DOE and Shainin DOE. This paper explores how these three main DOE approaches could be integrated to optimize product design parameters in a Research and Development company. The paper starts with enlightenment of the common DOE steps, follows by discussion of issues faced by the Research and Development company during the implementation of the three DOE approaches in product design. The paper subsequently illustrates how the three DOE approaches could be integrated as a new methodology for optimization of product design parameters. The integrated DOE methodology presented in this paper offers an alternative and effective way to conduct DOE in a dynamic product design and development environment.
Rapid Prototyping Technology: The Next Keystone for Small and Medium Ceramic Industry
Authors: Shuaib Ab. Aziz , Olalere Folasayo Enoch , bin Mat Daud Khairul Azhar
Published: September 2015

Many manufacturers believe building of physical prototypes is a bottleneck that slows down production process and increase production cost. However, since the quest for reality ends up with making real objects, physical prototypes cannot be out-rightly eliminated in product development process. With the advent of rapid prototyping technology (3D printer), manufacturing is now possible at any scale, from units of one to millions, large or small batches. Thus, rapid prototyping is seen as a possible technology for enhancing product development process; especially in small and medium industries that relies on manual production techniques. Hence, this paper investigates the viability of rapid prototyping technology in small and medium industries. With particular reference to ceramic industry, the paper demonstrates how the contemporary technology (Rapid prototyping) can be harmoniously merged with conventional techniques, so as to enhance product quality and reduce development time and cost.
A Productivity Improvement of a Packing Line
Authors: Jitchaiyaphum Peeyapach , Prombanpong Suksan
Published: September 2015

The purpose of this paper is to demonstrate a productivity improvement through waste reduction and line balancing. One of the obstacles of a manual assembly line nowadays is an awkward line design with over manpower, a lot of wastes, and low balance efficiency. As a result, the production line may not satisfy customer demand and ends up with low production line efficiency. This is due to the fact that this type of production line is operated by human and the customer demand or requirements are frequently fluctuated. Human workers are prone to make mistakes, inefficient, and unorganized. Thus, the major causes of production line down time are discussed with suggestion of remedy actions to improve the productivity. In addition, calculation of line balancing is demonstrated. One of the actual manual assembly lines will be used as a case study. It is found that after improvement line balance efficiency is increased from 46.49 to 86.66 percent with the productivity improvement of 159 percent.
Modeling of Order Oriented Planning for Printed Circuit Board Assembly Line
Authors: Saif Ullah , Guan Zai Lin , He Zong Dong , He Cong , Jun Cao
Published: September 2015

Printed circuit board (PCB) assembly planning problem has been given lot of attention to efficiently manage the orders of different PCB products. However, little effort has been paid to describe its comprehensive model which can demonstrate all the planning problems collectively considering in the surface mount technology (SMT) lines. A mixed integer model for PCB assembly line which includes the integration of different levels of the planning problems and considered component allocation problem (line balancing), PCB model sequencing problem (mixed model sequencing problem), feeder arrangement problem and component placement sequencing problem on different SMT machines collectively. Current research is significant to solve different planning problems of the PCB assembly line simultaneously to get the overall global solution of the problem in future.
Improving Quality Control Plan of Flexible Printed Circuit
Authors: Nunthaporm Ratchapon , Chutima Parames
Published: September 2015

Smart phone market has been growing larger and larger in recent years. This fact makes enormous competitiveness in its supply chain. Therefore, the product quality is the most importance part to improve business competitiveness, especially a flexible printed circuit which is a main assembly component in smart phones. This paper presents the approach to improve the quality control plan of the flexible printed circuit backend process. Failure Mode Effective Analysis (FMEA) was adopted to prioritize the defective and analyze weak points in the original quality control plan. Then, Statistical Process Control (SPC), optimizing inspection method and working procedure of inspection process, were introduced to improve the detection ability of the quality control plan. The results showed that the implementation of the new quality control plan could reduce escaped defective parts and the expense of escaped defect parts significantly.
Virtual Reality for Manufacturing Engineering in the Factories of the Future
Authors: Bougaa Mohammed , Bornhofen Stefan , Kadima Hubert , Rivière Alain
Published: September 2015

This paper discusses the possibilities of applying Virtual Reality (VR) technologies to Manufacturing Engineering, and in particular assesses its role in the Factory of the Future (FoF). We review, classify and compare the recommendations given by four major European reports on the challenges that have to be met for a successful deployment of the FoF, and we identify the potential contributions of VR to this vision in terms of new technologies, worker-factory relationship, modular infrastructure and production efficiency. We argue that VR can be a key technology to support the FoF at all levels of the Systems Engineering approach, either directly by applying it in standard engineering processes, or indirectly by leveraging other useful technologies.
A Unified Measure to Assess Universally Industrial Products for Ecological Balancing
Authors: Ramadan M.R.
Published: September 2015

Recent literature shows that most safety-related standards are not yet finalized as long as they seem far from assessing a sought level of safety. In addition, the shortened and hasty assessment of the industrial safety depends solely on what directly endangers mankind security and its economic assets. Moreover, well-known quality standards have not yet established a well-defined code to formulate the safety and liability area of the product quality. Owing to the safety-related weak points mentioned above, the present paper puts forth a unified and applicable mathematical model. Moreover, this paper confirms that humanity's engineering willingness of a prospective industrial product (vehicle) along with its manufacturing plants has not to overlook crucial safety instructions for a multi-entity Environmental Closed System (ECS). The suggested environment-related approach is here checked using three commonly applied methods, namely, SPC, FMEA, and Markov Chains of industrial safety estimation for products /plants. Main findings of the present paper conclude that industrial (product/ plant) safety, in its broadened sense, does embrace the gain/loss statistical data of a product's introductory versions and represents a trade–off function of its profits (resource renovation) and its losses (resources drain). In addition, the comprehensive resource-loss trend helps product designers and concerned researchers meet a wide range of customer requirements and more operational regulations.
Modeling the Collaborative Design of the Automotive Powertrain System Based on the Design Structure Matrix
Authors: Nguyen Thanh Cong , Jin Yao
Published: September 2015

This paper examines the application of proposed Design Structure Matrix (DSM) by modeling the collaborative design of the Automotive Powertrain System. A task of the whole design process is divided into several levels and some specific design tasks. Respectively, the flow diagram is set up based on the DSM principle. In order to optimize the design process and to shorten the development cycle, detailed analysis and reconstruction of DSM were performed by eliminating iterative design process.
A Review on Ultrasonic Welding Capability: Breakaway from Traditional Plastic
Authors: Musa Mohd Azam , Wan Saidin Wan Ahmad Najmuddin , Kasim Nazrul Idzham , Ibrahim Mohd Irman , Mohamad Noor Noraishah
Published: September 2015

The joint technology using ultrasonic welding is used to bond plastic material. Currently there are many researches to study the feasibility of using ultrasonic bonding to joint other materials. This paper reviewed the study on using ultrasonic bonding to joint multi metal, surface mount component, and textile material. The process configurations of each material are discussed and the results for each study are also presented. The multi metal materials bonding result shows that these materials bonded well to each other. The ultrasonic bonding strength for SMT components was as good as reflow oven and it was cosmetically accepted. The configuration of textile materials is investigated using vibrating ultrasonic horn and stationary anvil using high mechanical vibration and the result show it can be integrated ultrasonically. With advancement of computer control in ultrasonic welding, this technology can be used for any material in future to achieve world class manufacturing.
An Investigation of Machining Time and Surface Roughness in Wire-EDM for Inconel 800
Authors: Dutta P. , Panja S.C. , Sastry G.R.K.
Published: September 2015

This paper presents an experimental investigation on the influences of EDM parameters on machining time and surface roughness for machining Inconel 800.Inconel800is widely used in construction of equipment that must have high strength and resist carburization, oxidation and other harmful effects of high temperature exposure. The selected WEDM parameters are pulsed current (210,220 and 230A), pulse-on time (2,3.25, 4.5, 5.75, 7 and 8.25μs) and pulse-off time (19 and 46μs). It has been observed that surface roughness increases with the increase of pulse-on time and pulse current. Similarly machining time decreases with the increase of pulse current and pulse-on time. Conversely, a decreased value of pulsed current and pulse-on time results in a better surface finish and increased machining time.
Analysis of the Inherent Frequency of Circular Vibrating Screen and Modelling and Simulation of Matlab/Simulink
Authors: He Yong , Gao Quan Jie
Published: September 2015

Based on a company's production of single shaft circle vibrating screen, we set up the mechanical model of two degrees of freedom and the vibration differential equation to get the natural frequency of the system, and compared with the working frequency of vibrating screen, it can be roughly judged whether the system work normally when resonance occur; And establish the system simulation model by using the method of integral module in the Matlab/Simulink module to get its center of mass in motion. The research results can provide theoretical basis for the design of the screening machine.
The Design of the Nozzle for the Nozzle Box Microturbines
Authors: Fershalov Andrey Yu. , Fershalov Mikhail Yu. , Fershalov Yuriy Ya. , Sazonov Timofey V. , Ibragimov Damir I.
Published: September 2015

The paper presents a comparative analysis of existing designs nozzle turbines. The advantages and disadvantages of existing designs nozzles. The description of the new nozzle design for axial microturbines. The analysis of the reasons for reducing the loss of kinetic energy of the flow of the working fluid in the nozzles of the proposed design offers.
Dynamic Analysis for Rotors of a Twin-Screw Compressor with Gas-Induced Cyclic Loads
Authors: Wu Yu Ren , Tran Van The , Hsu Po Hua
Published: September 2015

The effects of dynamic forces and elastic contacts in a pair of intermeshing rotors with the gas-induced cyclic loads based on the multibody dynamics simulation have not investigated yet. The comparison of numerical spectra of time and frequency domains of acceleration with the experimental noise spectrum of an oil-injected twin-screw compressor has not also considered. Therefore, this study proposes a new strategy, which combines the fluctuating torques and forces induced by cyclic gas pressure on the screw rotors to numerically predict vibration response in an oil-injected twin-screw compressor.
Sealing Performance of Thin Corrugated Metal Gasket
Authors: Choiron M. Agus , Purnowidodo Anindito
Published: September 2015

A thin corrugated metal gasket had been developed for low pressure work condition. In this study, thin corrugated metal prototype gasket was tested by using water pressure test. A Kyowa T-150N was used as water pressure tester. The experiment was conducted after ensuring that there was no leakage in each joint part. The leak test can only indicate two conditions of leakage which are leak or no leak. Pressure applied in the water pressure test was 200 psi, with 5 minutes of lapse time. The leakage was determined by the presence of liquid from the flange and the change in pressure gauge. Based on leak test results, it can be denoted that thin corrugated metal gasket can be used for 200 psi working pressure and 2.2 – 3.3 kN tightening load.
Improvement in CAM Shaft Design: An Experimental Application and Recommendation
Authors: Al-Khaldi M.S. , Mohd Ariffin Mohd Khairol Anuar , Sulaiman Sreenivasan , Bahrudind B.T.H. , Aziz N.A.
Published: September 2015

A new design of CAM shaft has been investigated for Campro engine 3.0L V4 engine. The new design adds a modification to Cam profile peak point in the Camshaft to be controllable at different speeds through a hydraulic system. The new design was simulated in CFD for tolerating stresses. The new design promotes Cams to give the exact heights at different engine speed depending on the optimize value valve opening time. At the same time this paper discusses the prediction of power performance of internal combustion engines with the new design. The expected result will significantly improve the engine speed-torque curve, reduce emission gases, and reduce fuel consumption. The new design model predictions need to be tested experimentally for further improvement in the hydraulic system before the commercial use.
Optimal Cantilever Design by Topology and Shape Optimization Methods
Authors: Lee Jin Woo
Published: September 2015

This work presents the framework to optimally design a cantilever for torsion mode frequency maximization. A cantilever design problem is formulated by topology and shape optimization methods. The torsion mode frequency is selected as an objective function, and the volume of the cantilever and the first bending mode frequency are constrained. Two optimization problems are defined and sequentially solved for the specific values. A new idea in this work is using a final topology obtained in the topology optimization problem as an initial shape in the shape optimization problem. The torsional mode frequency of the optimized cantilever is well improved in comparison with a nominal cantilever.
Simulation Analysis of Planetary Gears Train of Semi-Direct Drive Wind Turbine Based on ADAMS
Authors: Cheng Yan Li , Xiao Zheng Ming , Huan Li Rong , Chen Fu
Published: September 2015

The speed increasing gearbox is the key part of the wind turbine and its role is to transmit power which is generated by wind turbines to the generator through the gear system. The single-stage planetary gears train system is commonly used in the semi-direct drive wind turbines. In this paper Pro/E is used to establish the three-dimensional model of the speed increasing planetary gear system of the semi-direct drive wind turbine. Motion pairs, drive and load of the model are added by ADAMS. Angular velocity change rule of the parts is obtained. The change rules of the mesh force of the planetary gears, ring and sun gear can be obtained through the dynamic simulation and analysis using the contact algorithm. These are useful to study the vibration and noise of the system.
Reliability of a Hydrodynamic Journal Bearing
Authors: Diop Khadim , Charki Abdérafi , Champmartin Stéphane , Ambari Abdelhak
Published: September 2015

Journal fluid bearings are widely used in industry due to their static and dynamic behavior and their very low coefficient of friction. The technical requirements to improve the new technologies design are increasingly focused on the indicators of dependability of systems and machines. Then, it is necessary to develop a methodology to study the reliability of bearings in order to improve and to evaluate their design quality. Few works are referenced in literature concerning the estimation of the reliability of fluid journal bearings. This paper deals with a methodology to study the failure probability of a hydrodynamic journal bearing. An analytical approach is proposed to calculate static characteristics in using the Reynolds equation. The commonly methods used in structural reliability such as FORM (First Order Reliability Method), SORM (Second Order Reliability Method) and Monte Carlo are developed to estimate the failure probability. The function of performance bounding two domains (domain of safety and domain of failure) is estimated for several geometrical configurations of a hydrodynamic journal bearing (long journal bearings with the hypotheses of Sommerfeld, Gümbel and Reynolds, and a short journal bearing with the hypothesis of Gümbel).
Study on the Dimensionless Model of High-Speed Penetration Efficiency
Authors: Song Mei Li , Wang Xiao Ming , Li Wen Bin
Published: September 2015

Penetration efficiency reflects high speed projectile penetration ability with the impact velocity (>800m/s) variation. To further study the penetration efficiency engineering model, the physical and mechanical parameters that affect the penetration efficiency of high-speed projectiles penetrating into concrete target are analyzed, penetration efficiency dimensionless quantities are determined, such as projectile’s length to diameter ratio, projectile and target strength ratio, etc. The dimensionless equation of penetration efficiency is got by using the homogeneous principles of the laws of physics dimensionless. According to experimental data, a function of dimensionless penetration efficiency and dimensionless projectile speed is fitted. Finally, the model is verified by test, and the model calculations and experiment results agree well. The model obtained in this paper can estimate the projectile’s impact velocity when the penetration efficiency reaches the maximum, it would be a theoretical guidance for high speed penetration effects experiments.
Innovative Design and Manufacturing Technology of High Temperature Air Combustion (HTAC) Municipal Solid Waste Incinerator
Authors: Kerdsuwan Somrat
Published: September 2015

Incineration is a Thermal Treatment Technology (3Ts) that could be expressed as the way to get rid of waste effectively with the reduction of its mass and volume. However, to control the combustion process efficiently, especially combustion temperature, with low energy content in Municipal Solid Waste (MSW), an additional fuel is needed and leads to increase of operating cost compared with other disposal option. High Temperature Air Combustion (HTAC) has been successfully demonstrated in a lab-scale incinerator for energy saving and pollutant reduction, especially NOx. This article has the objective to design and manufacture the prototype scale High Temperature Air Incinerator with a capacity to treat MSW of 12 Ton per day. The system consists of an automatic feeding machine to feed the waste into the primary combustion chamber (PCC) where the combustion takes place. The push ram is used to push the burning waste and fall down to the lower hearth. Primary combustion air is supplied into PCC at the amount lower than the stoichiometric requirement to produce the combustible gas which is flown into the Secondary Combustion Chamber (SCC) located above PCC. Secondary combustion air is injected to react with combustible gas to convert to the product of complete combustion. A part of hot flue gas which is flew out from SCC is reverted and mixed with fresh air, in order to reduce oxygen concentration, before passing through the heat exchanger tube bundle which is placed inside SCC in order to exchange heat with hot flue gas. To manufacture the designed incinerator, the detail of materials used as well as the frabication method is explained. It has been shown that HTAC can be applied for thermal destruction of waste successfully, in term of energy saving and pollutant free. Benefits of this research work will promote the using of thermal treatment technology of dispose of MSW with lower operating cost and lower pollutants.
Failure Analysis of Composite Thin Walled Multi-Cell Closed Cross Section Beams with Multi-Tapered Configuration
Authors: Ahmed Sohail , Ayub Sanam
Published: September 2015

This paper explicitly highlights the failure analysis and study of thin walled composite beams (multi-cell and multi-tapered) in cantilever configurations when subjected to constrained torsional load, using MSC Patran / Nastran finite element package. Initially, the verification of the model was done with the analytical results in order to ensure the model accuracy. All the multi-tapered beams under examination are composed of closed section and three cell configuration with twisting moment applied at the free end. There is a vivid description of all the effects of different composite material and various stacking sequences on the margin of safety and failure loads. This paper also verifies the influence of various geometrical configurations (Beam lengths, tapered angles and point of variation of tapered angles) of beams on the failure loads. This paper would help in the wing design phase of modern agile and high speed aircraft in which multi-cell closed cross section beams are integral part.
Simulation Research on the Hydraulic and Thermal Operation for Complex District Heating System
Authors: Zhou Zhi Gang , Wang Peng
Published: September 2015

In recent years, complex district heating systems will become the main style in most of big cities of china. How to simulate the hydraulic and thermal operation becomes more and more import. In this paper, the simulation mathematical model and method on the hydraulic and thermal operation for complex district heating system is proposed. By using the optimal of economical operation efficiency of the heating networks as the objective function and thermal balance as boundary conditions, the mathematical model is established. Meanwhile, the simulation software of hydraulic and thermal operation for complex district heating system has been developed. Functions of software involve information compilation, hydraulic calculation analysis, source thermal operation calculation, etc.
Field Evaluation of Five-Level Heat Dissipation Models under PV Array Structure Installed in the Tropics
Authors: Ya’acob M. Effendy , Hizam H. , Hashimoto Y. , Adam B. , Othman N.F.
Published: September 2015

The intermittent drawbacks due to fluctuating temperature factor inside photovoltaic (PV) cells have clearly affected the overall energy performance especially in stochastic weather conditions. Temperature element in the tropical regions is a crucial factor to be determined based on Standard Testing Condition (STC) and Nominal Operating Cell Temperature (NOCT) correlations. Based on the crucial implication of heat dissipation, this study shares some insights of five level heat contour covering the surrounding temperature, PV surface temperature, PV bottom temperature and 2-level of two feet height located under PV array. The field data in real-time approach has been brought up in line to support the energy balance modelling for PV applications with localized heat contour analysis using statistical evaluations. The regression analysis of the 3471 data sampling for the period of 5 days (7AM till 7 PM) produces very good results with correlation coefficient, R2 = 0.97.
The Nonlinear Multi-Fuel Combustion Equation: Comparison between the Model of Heat in SIE for Ethanol-Gasoline Blended and High Order Iteration Method
Authors: Soontornchainacksaeng Thanakom , Juntarakod Paramust
Published: September 2015

A quasi one-dimensional engine cycle, the simulation program was developed to predict the simple heat transfer during combustion stroke in a spark ignition engine (SIE) of ethanol-gasoline blended fuels. A two-zone heat release model was utilized to model the combustion process inside the combustion cylinder by using high order iteration method (HIM) in combustion equation. The fuel, air and burned gas properties throughout the engine cycle were calculated by using variable specific heats. The transient heat flux inside the combustion chamber due to the change in the cylinder gas temperature and pressure during combustion was determined by using the constant of heat rate from enthalpy heat rate coefficient. The program was written in MATLAB. The results of this paper such as the average heat flux cycles of the burned gas during the combustion and showing the emissions of at during the combustion process by high iteration method. Based on these results, it was concluded that the fundamental thermodynamic properties of the fuel, air, and combustion product species were in agreement with previously published results to within the scatter of those results typically less than 1% form references 1%. The combustion products were calculated by the high order iteration methods by around 1% from the old methods.
A Millimeter-Wave SIW Gain Equalizer Using LTCC Technology
Authors: Wang Zhi Gang , Ding Hao
Published: September 2015

This paper presents a novel structure of millimeter-wave amplitude equalization based on low temperature co-fired ceramic (LTCC) technology, which is implemented by substrate integrated waveguide (SIW) resonator, thin film resistor, microstrip-line and metallic via hole probe. It has advantages of compact, easy for integration, low cost, low loss, and mass-producible. The effects of each component for equalizer performance have been analyzed by simulation. In order to validate the new proposed topology, a millimeter-wave gain equalizer is developed and verified by full-wave simulation using 9-layers Ferro A6 substrates. The designed equalizer exhibits excellent performances.
YSr2Fe3-xCoxO8 as a Potential Cathode Materials for SOFCs
Authors: binti Mohd Kamis Auji Afiqah , Zaini Juliana Hj , Abu Bakar Saifullah , Lim Chee Ming , Azad Abul Kalam
Published: September 2015

The composition YSr2Fe3-xCoxO8 (for x = 0.5, 3.0) has been investigated as an alternative cathode material for Solid Oxide Fuel Cells (SOFCs). X-ray diffraction (XRD) pattern shows that the composition YSr2Fe2.5Co0.5O8 crystallizes with cubic symmetry in the space group Pm-3m and YSr2Co3O8 crystallizes with tetragonal symmetry in the space group P4/mmm. Rietveld refinement of XRD data shows the cell parameter of the cubic YSr2Fe2.5Co0.5O8 is a = b = c = 4.1964(2) (Å) and tetragonal YSr2Co3O8 is a = b = 9.8998(9) (Å) and c = 8.9617(6) (Å). Scanning electron microscropy (SEM) images show porous structure for both the samples, which is favourable as a cathode for Solid Oxide Fuel Cells.
Chemiresistor Gas Sensor Array Based on Conducting Polymers for the Discrimination of Virgin Coconut Oil
Authors: Rañola Rey Alfred G. , Santiago Karen S. , Sevilla Fortunato B.
Published: September 2015

An array of chemiresistors based on conducting polymers was assembled for the differentiation of VCO. The chemiresistor sensors were fabricated through the potentiostatic electrodeposition of polyaniline, polypyrrole and poly (3-methylthiophene) on the gap separating two planar gold electrodes set on a Teflon substrate. The electrical resistance of the sensors were measured and observed to change when exposed to the headspace of oil samples. The sensor response was rapid and exhibited good reversibility and reproducibility. Different signals were obtained for each coconut oil sample and pattern recognition techniques were employed for the analysis of the data. The developed E-nose system was able to discriminate VCO from refined, bleached and deodorized coconut oil (RBDCO) and rancid VCO.
Smart Diagnosis Using an On-Board Middleware
Authors: Bouroumine Ayoub , Mustapha Zekraoui , Maach Abdelilah
Published: September 2015

Recent approaches to preventive maintenance have shifted from periodic maintenance based on static parameters to a continuous and a periodic maintenance that deploys high-tech tools to track remotely the “health” of equipments. In this paper, we propose an approach to maintain a high level of reliability and to achieve the maximum efficient use of the working parts within vehicles and machines. This paper marks the use of various techniques in the remote maintenance and diagnostics by means of classical and new methods for monitoring equipments remotely. And hence identifying their failure at earlier stages and preventing their breakdown. The technique relies on an onboard device that monitors and analyses the vibrations of the targeted parts using local knowledge stored within the middleware data base and global knowledge obtained remotely from the server.
An Equivalent Condition Score Method for the Calculation of the Failure Rate for Power Transmission Equipment with Condition Maintenance
Authors: Meng Z.J. , Zhu X.X. , Song X.F.
Published: September 2015

In this paper, we propose a new method, namely equivalent condition score (CS) method, to calculate the failure rate of power transmission equipment with condition maintenance. Through the conversion of the CS evaluated after maintenance, we can investigate the effect of maintenance on the failure rate, and then calculate the failure rate of the equipment. The effectiveness of the proposed method is verified by field maintenance data. As shown in this paper, the equivalent CS method has a simplified calculation process and specific physical meaning.
Fault Detection and Diagnosis in Gears Using Wavelet Analysis Techniques and Comparison on their Diagnostic Capability
Authors: Lokesha M. , Majumder M.C. , Ramachandran K.P.
Published: September 2015

The concept of vibration based condition monitoring technology has been developing at a rapid stage in the recent years suiting to the maintenance of sophisticated and complicated machines. Nowadays, wavelet analysis based signal processing technique is applied as effective tool for condition monitoring. The experimental studies were conducted on the gear testing apparatus to obtain the vibration signal from a healthy gear and an induced faulty gear. In this paper, two different techniques using Laplace wavelet as base function are used to characterize the fault in the gear signals, specifically wavelet enveloped power spectrum and wavelet kurtosis. The wavelet parameters are optimized using genetic algorithm to select most fault related features. A comparative study detailing features of fault characterization is also given in order to understand the effectiveness of both the wavelet based signal processing methods and their fault diagnosis capability.
Solving the Issue of Electronic Breakdown of Hobbing Machine through Kobetsu Kaizen Methodology: A Case Study
Authors: Dave Yash , Sohani Nagendra
Published: September 2015

Today companies are implementing total productive maintenance in order to become world class industries to have a competitive edge over worldwide. In this regard Kobetsu Kaizen (Focused Improvement) pillar having a very significance effect to solve the specific problem. The main aim of this paper is to implement the complete Kobetsu Kaizen methodology of TPM, to solve the issue related with the sudden drop of availability rate of hobbing machine in a gear manufacturing cell. The result of the paper shows the advantage of Kobetsu Kaizen pillar implementation in the sense that breakdown frequency of the machine has been reduced considerably.
Investigation of the Influence of the Wings and Tail in Flight of the Jumping Robot
Authors: Jatsun S.F. , Loktionova O.G. , Vorochaeva L.Yu. , Vorochaev A.V.
Published: September 2015

In this paper we will look at a jumping robot, whose controlled gliding is provided by the wings and tail, develop a mathematical model which describes the apparatus’ movement and pay special attention to the interaction of the wings and tail with the surrounding environment.
Development and Validation of the Kinematic Analysis of a Low Low-Cost 4-Link Robot
Authors: Ajayi O. Olatunbosun , Onyemaechi E. Okafor , Obumneme Onwudiwe
Published: September 2015

In this paper, we describe the development and validation of the kinematic analysis of a low low-cost 4-link robot the first of its kind in Nigeria. This study comprises the following key tasks which describe the methodology for the robot development: design and kinematic analysis of the robot mechanism, construction/fabrication and assembly of the robot, system development (computer interface with the robot) and experimental validation of the robot control. The goal of this robot is to pick an object and drop the object in a specified position. The algorithm to control the robot on the computer was coded in Java and simulated in MATLAB/Simulink platform. The robot was experimentally verified and the results are presented in this paper. The experimental results show that robot development is feasible in Nigeria. The contribution of this study will enhance and promote robot control and development in Nigeria and developing third world countries.
A New Method to Solve the Kinematic Problem of Parallel Robots Using an Equivalent Structure
Authors: Trang Thanh Trung , Li Wei Guang , Pham Thanh Long
Published: September 2015

This paper proposed a new method to downgrade the kinematic mathematical model of parallel robots. A technique of complement mathematical models uses constraints to change the form of objective functions. An equivalent structure is used to replace the original structure of investigated robots. The difficulties encountered in solving problems having the transcendental form can be avoided by downgrading formula of the new mathematical model. The original formula which is usually in quaternary order can be downgraded to quadratic form. The main advantages of this method are understandable mathematical basis, high accuracy, and quick convergence. Carrying out solutions for pracitical kinematic problems of parallel robots becomes very promissable.
A Novel Dual-Loop Control Scheme for Payload Anti-Swing and Trolley Position of Industrial Robotic 3DOF Crane
Authors: Faisal Muhammad , Jamil Mohsin , Rashid Usman , Gilani Syed Omer , Ayaz Yasar , Nasir Khan Muhammad
Published: September 2015

In this paper, we propose a novel dual-loop control scheme (DLCS). We did not see such investigation of DLCS in the previous research work. DLCS scheme is a combination of classical PID and advanced state feedback control techniques. The proposed technique is used to control swing angle and trolley position of a 3DOF crane. Extensive simulations have been carried out using MATLAB / Simulink and practically validated on a Quanser 3DOF crane system. Experimental results indicate that the proposed DLCS control scheme improves crane operation by damping the payload oscillations. The scheme also smoothen the trolley motion. Our suggested technique provides better performance in terms of payload oscillations comparing to the classical PID.
The Motion Planning for Spherical Robot with Two Motors
Authors: Wang Xin
Published: September 2015

In this paper, we proposed a spherical robot with two motors in the horizontal and vertical directions which derive the robot to do omni-directionally roll. Based on the structure of the robot, we derived the kinematic model using inertial and moving coordinate system. In order to minimize the energy of the system, an optimization problem with two optimization variables which are the parameters to control the angular velocity of the motors is given. After that, a particle swarm optimization (PSO) algorithm is used to solve the optimization problem. The simulation shows that the motion planning with the algorithm has high precision.
Intelligent Control System Design for a Teleoperated Endoscopic Surgical Robot
Authors: Khalifa Alaa , Ramadan Ahmed
Published: September 2015

This paper concerns with the control system design for a teleoperated endoscopic surgical manipulator system that uses PHANTOM Omni haptic device as the master and a 4-DOF parallel manipulator (2-PUU_2-PUS) as the slave. PID control algorithm was used to achieve the trajectory tracking, but the error in each actuated joint reached 0.6 mm which is not satisfactory in surgical application. The design of a control algorithm for achieving high trajectory tracking is needed. Simulation on the virtual prototype of the 4-DOF parallel manipulator has been achieved by combining MATLAB/Simulink with ADAMS. Fuzzy logic controller is designed and tested using the interface between ADAMS and MATLAB/Simulink. Signal constraint block adjusted the controller parameters for each actuated prismatic joint to eliminate the overshoot in most of position responses. The simulation results illustrate that the fuzzy logic control algorithm can achieve high trajectory tracking. Also, they show that the fuzzy controller has reduced the error by approximately 50 percent.
Effect of Treating Time on Mechanical Properties and Structure of Aramid Fibers during Heat Drawing
Authors: Kong Hai Juan , Yang Peng , Teng Cui Qing , Dawelbeit Ahmed M.S. , Yu Mu Huo
Published: September 2015

High modulus Poly (p-phenyleneterephalamide)(PPTA) fibers was prepared by heat drawing process, in which the fibers rearranged their structures for further improvements in their crystalline perfection, crystal line orientation. The modulus of PPTA fibers could be improved when fibers treated in an appropriate condition. The influences of heat treating time on the structures of the fibers and their properties were investigated by using two-dimensional wide-angle scattering (WAXS).