bluuebunny/crossref_metadata_2025 huggingface dataset:
A Semi-Analytical Model for Buckling of Laminated Plates with the NKQ Method
Authors: Khandan Rasoul , Noroozi Siamak , Vinney John , Sewell Philip , Koohgilani Mehran
Published: November 2012

A semi-analytical approach for analysis of laminated plates with general boundary conditions under a general distribution of loads is developed. The non-linear equations are solved by the Newton-Kantorovich-Quadrature (NKQ) method which is a combination of well-known Newton-Kantorovich method and the Quadrature method. This method attempts to solve a sequence of linear integral equations. In this paper this method is used to propose a semi-analytical model for buckling of laminated plates. The convergence of the proposed method is investigated and the validation of the method is explored through numerical examples and the results compared with finite element method (FEM). There is a good agreement between the NKQ model and FEM results.
Modal Stress Intensity Factor Using Extended Finite Element Method
Authors: Abdelkader Benmessaoud , Mohamed Badaoui , El-Khalil Hachi Brahim , Khaira Nehar Camellia , Mohamed Guesmi
Published: November 2012

The aim of this paper is the determination of the evolution of the modal stress intensity factor (MSIF) for a non-propagating crack subjected to dynamic loading using the extended finite element method (X-FEM). The main advantage of this method coupled with the modal analysis is its capability in modeling cracks independently of the mesh and in a reduced computational time compared to the finite element method coupled with dynamic iterative method. The proposed procedure is applied to a reference problem (cracked plate). The MSIFs obtained agree well with those found by indirect boundary element (IBEM), weight function and Newmark’s explicit methods.
Stress of a Rocket Turbine under Different Loads Using Finite Element Modeling
Authors: Amr Elhefny , Liang Guo Zhu
Published: November 2012

Turbopump unit is a key component of the liquid rocket engine assembly and in this paper stresses of a turbopump turbine are investigated using finite element (FE) analysis. Three-dimensional solid modeling of a group of blades and a sector of the disc was first created on CAD software and subsequently exported to a FE package for analysis. The FE results reveals that the maximum stresses in the blades result from rotational and thermal loads owing to the relatively high operating speed and temperature of the turbine and they are located at the root of the blades. Also, the maximum stresses in the disc result from rotational and thermal loads, but with higher values than those in the blades and they are located at the center of the disc. The result of this study may serve as a guideline in the selection of the materials for both the disc and blades.
Dynamic Stress Intensity Factor Computation by Using Xfem Formulation
Authors: Mohamed Guesmi , Elkhalil Hachi Brahim , Mohamed Badaoui , Sayah Goual Mohamed , Abdelkader Benmessaoud
Published: November 2012

In this paper, we present a modeling of planar structures under dynamic loading containing stationary cracks in order to determine the dynamic stress intensity factor (DSIF). This parameter will be evaluated by using the eXtended Finite Element Method (XFEM) coupled with two different techniques, namely the technique of displacement jump and that of interaction integral. A comparison between the two approaches is discussed. Moreover, the effects of crack orientation and damping material on the DSIF variation are tested. The good correlation of the obtained results for the treated examples with the literature ones demonstrates the effectiveness, accuracy and robustness of the computer software developed in this study.
Study of Induction Heating Process Applied to Internal Gear Using 3D Model
Authors: Barka Noureddine , Ouafi Abderrazak El , Chebak Ahmed , Bocher Philippe , Brousseau Jean
Published: November 2012

The current paper is principally dedicated to the study of geometry and frequency effects for internal spur gears heated by induction. The overall work is realized by the simulation efforts performed on Comsol multi-physics software. The 3D model used during this study is built basing on coupling between Maxwell’s and heat transfer equations. This model is used to calculate the temperature profile in the gear in function of machine parameters. The module and the frequency are varied to determinate their effects. In fact, two gears having the same external diameter but different modules are exploited during this study and the frequency is varied from low to high level. The obtained results allow understanding the effect of module and frequency on the final temperature distribution. Finally, the optimal frequency value permitting to have the best temperature profile is found.
Sensitivity Study of Temperature Profile of 4340 Spur Gear Heated by Induction Process Using 3D Model
Authors: Barka Noureddine , Chebak Ahmed , Ouafi Abderrazak El , Bocher Philippe , Brousseau Jean
Published: November 2012

This paper presentsa sensitivity study using a Comsol3D model simulation for spur gear heated by induction process. Based on an adequate formulation and taking into account the material properties, a multi-physics 3D model is built to calculate the final temperature distribution determinate according the machine parameters and some geometrical factors (coil width and gap between coil and gear). Since the hardness profile is affected by thermal historic during heating, the surface temperatures are deeply analyzed versus the initial current density and the heating time using medium (MF) and high frequencies (HF). Finally, the sensitivity of hardness profile with the machine parameters variation isinvestigated using various statistical tools applied to the obtained results. The obtained results exhibits the main machine parameters and theirs effects on the hardness profile.
The Design of the Pre-Heater of Gas-Operated Hot-Water Heater
Authors: Yang Tung Sheng , Ke Meng Wei , Yeh Jen Chuan
Published: November 2012

This study developed the pre-heating device which heats the water by using the exhaust gases from gas-operated hot-water heater. Thus the temperature of water is raised at an exit of the pre-heating device. The pre-heated water is then transport to the gas-operated hot-water heater to increase the water temperature which is used for showers. Thus, the thermal performance is enhanced with the pre-heating device. The overall performance of the absorption heater system is analyzed by finite element analysis. The different types of pre-heating devices are simulated for the thermal performance. Other important considerations for producing the pre-heating devices are the bending-tube technology and manufacturing cost. The appropriated design of pre-heating device is selected for producing. Thus the performance and testing of pre-heating devices will be carried out.
Heat Transfer Study in Oil Channels of a Power Transformer Winding ONAN Cooling System with and without Insulating Paper Based on Numerical Modeling
Authors: Salari Sina , Yousefi Amir , Nasrollahzadeh M. Reza , Khalilikhah Mostafa
Published: November 2012

In this study 3 geometry for ONAN cooling system of power transformers are numerically simulated with (Perforated nomex) and without insulating papers (Netting tape). Geometries are A, RA, and R type. The A type has just axial channels. The RA type has radial and axial channels but there are no baffles to drive the flow into radial channels. The R type is like the RA type but with baffles. Insulating paper used in this study has some holes to cause some vortex in flow to increase heat transfer. The CFD code used is Fluent 6.3. To simulate flow in natural convection mode, Boussinesq model and pressure inlet and outlet boundary conditions are used. Results show that the most effective geometry is the one with baffles that drive flow in radial channels in addition to axial channels. Streamlines near the holes in papers show that that height of holes is too small to affect heat transfer and, so, the comparison between geometries with and without paper shows the types without paper have higher heat transfer coefficients.
The Electrochemical Principle of Measuring Underwater Electric Field
Authors: Wang Xiang Jun , Zhang Shu , Liu Yi , Ji Dou
Published: November 2012

Whether electric stealth ship, or ship by ship to achieve the electric field detection, location can’t be separated to provide high-precision measuring equipment field measured data, underwater electric field to discuss the principle of electrochemical measurements and underwater electric field measurement equipment calibration, field measurements of underwater deep understanding of electrochemical principles and calibration of measuring equipment underwater electric field can improve the accuracy of the electric field experiments, and finally according to proposed calibration method, calibration of measuring equipment of a type of electric field.
Fatigue Reliability of Selective Laser Sintered (SLS) Components Using Weibull Analysis
Authors: Naiju C.D. , Annamalai K. , Karthik S. , Goutham Ramaraj
Published: November 2012

Selective laser sintered metallic specimens were tested for fatigue cycles to failure and analyzed for reliability. In this study, Taguchi’s experimental techniques were used to develop a modified L9 orthogonal array. Three different process parameters, laser power, scan spacing and slice thickness were selected for manufacturing the components. Fatigue testing was carried out as per ASTM standards and relationship of the process parameters on the fatigue cycles to failure was investigated. ANOVA method was used to find the dependence of the process parameters and to find the influence of main process parameter on fatigue cycles to failure of the specimens. Laser power was found to be the most significant factor compared to scan speed and slice thickness. Two-parameter Weibull method was used for the reliability studies by which reliability was estimated for different cycles to failure.
Reliability of Fused Deposition Modelling (FDM) Components on Fatigue Cycles to Failure Using Weibull Analysis
Authors: Naiju C.D. , Annamalai K. , Goutham Ramaraj , Karthik S.
Published: November 2012

Application of fused deposition modelling components are gaining popularity in functional application. In order to use these components directly for functional application, reliability in service has to be acheived. A Reliability analysis was caried out on components manufactured by fused deposition modelling. A standard test specimen as per ASTM was prepared and tested for fatigue cycles to failure. Bending stress was calculated prior to the fatigue testing by varying the slice thickness. Fatigue test was carried out with differnt loading condition. Fatigue test results were subjected to weibull analysis to determine the reliability of FDM components. The Weibull design values were calculated and Weibull distribution plot for failure was plotted and analyzed. Estimation of reliabilty for different cycles to failure was also found out.
Mesh Denoising Based on Spherical Wavelets in Reverse Engineering
Authors: Hu Jian Ping , Xie Qi
Published: November 2012

This paper presents an approach for removing noises of 3D meshes using spherical wavelets. An input 3D mesh is firstly transformed into a spherical signal by a fast low distortion spherical parameterization. This spherical signal is then sampled regularly on the sphere and transformed into the wavelet domain where noises of 3D meshes can be removed easily. Experiments are taken with some typical 3D meshes, which reveals that our method can obtain good results.
Adaptive Building Envelope System Using Parametric Camshaft Mechanism for Sustainable Building
Authors: Sjarifudin Firza Utama
Published: November 2012

Adaptation is essential to manage the problem of climate change. In order to meet this growing challenge, this paper propose an adaptive building envelope system that can optimize its configuration by responding to environmental changes that could achieve new levels of sustainable performance and energy efficiency. Most of the current adaptive building envelope uses kinetic techniques in order to make its formation transformable. However, with the use of kinetic components such as a large amount of interactive motorized system that require electrical power may also cause further decrease the building energy efficiency. This paper proposes a camshaft mechanism system for adaptive building envelope that uses less motors, controllers, and sensors. This system uses pre-programmed analysis data of daily solar radiation changes to parametrically drive the number of rotation phase and length of nose (Lobe Lift) that generates the shape of camshaft. This camshaft then controls the changing opening and closing values of the building envelope components. The advantages of this system are less energy consumption, less maintenance and lower cost since it uses less motors, controllers and wiring. In conclusion, this paper has developed a prototypical tool that facilitates the new approach to energy efficient kinetic buildings.
Mechanics Analyzing of Suspended Formwork Supporting System and Research of Decision System in Constructing Transfer Storey Structure of Steel Reinforced Concrete
Authors: Li Yang , Cai Jian
Published: November 2012

This article introduced the research of suspended formwork in constructing transfer storey structure of steel reinforced concrete, and the co-working principle of beam and supporting system, and the design theory of suspended formwork method. The author farther founded construction decision system through analytic hierarchy process, and applied in construction site successfully.
Design and Analysis of a Ultrasonic Sliding Platform
Authors: Mou Shann Chyi , Yang Li Hui , Chen Ying Hao
Published: November 2012

This article is meant to perform the simulation behavior of fluctuation and vibration for the ANSYS software against piezoelectric structure. From the relevant analysis, it can be aimed to devise the single-axis ultrasonic sliding platform inclusive of propeller system and sliding mechanism. Within both systems of propeller system and sliding mechanism, they are adopted with the piezoelectric buzzer as the material for driving components. The propeller actuator (propeller system), on the Ni-alloy plate of buzzer, will be divided to the non-axisymmetric structure at the respective angles of 90º, 120º and 150º with the resultantly produced radial vibration to move the platform. Also, the sliding vibrator (sliding mechanism) will be evenly divided into 3 parts of axisymmetric structure at the angle of 120º with its longitudinal vibration to reduce the friction caused by platform movement. In the designing process, it is adopted with the finite element analysis software - ANSYS to perform analysis and simulation for the vibration patterns of actuator and vibrator. By measuring the friction coefficient of sliding platform, it is well verified that the introduction of sliding mechanism will certainly reduce the friction caused by platform movement. The static friction coefficient will be reduced from 0.37 to 0.2 to result in considerably increasing displacement speed of platform.
Influence of pH on Cadmium Removal from Wastewater by SSI
Authors: Li Jun Guo , Shi Yan , Bi Na , Feng Yan Ping
Published: November 2012

Spherical sponge iron (SSI) with high activity and intension could be prepared through direct reduction by hydrogen. pH value in solution increased despite initial pH because a large amount of H+ was depleted along with erosion battery reaction of SSI. It was suggested that initial pH has significant influence on pH value in solution and cadmium removal percentage by SSI. When the initial pH maintained at 2.03, cadmium removal percentages were only 10.17% and 22.00%, respectively, in 10min and 30min. While the initial pH was adjusted to 3.00, cadmium removal percentage could be elevated to 73.10% and 95.46% in similar libration time. Cadmium removal by SSI appeared to be the first-order reaction. When the initial pH was maintained at 2.03, the apparent reaction rate constant of cadmium removal by SSI was only 0.434 and 1.027 h-1, while which could be elevated to 5.882 and 5.249 h-1 when the initial pH was adjusted to 3.00.
Application of High-Linearity Analog Optocoupler in DSP Acquisition Circuit
Authors: Tan Ying Qi , Liu Xiang Yang , Den Bao Qing
Published: November 2012

An applied hardware circuit for detecting the AGC signals isolated with DSP is designed based on a high-linearity analog optocoupler. The problem of narrow measuring scope, low linearity and instability which caused by noisy signals is resolved when collects industrial analog signals into DSP. The practical circuit with proper design of components is designed through repeated experiments. The experiment data are analyzed by the method of least-square. The analyzed results show this circuit has the high accuracy and good linearity.
Sliding Control with Chattering Elimination for Hydraulic Drives
Authors: Schmidt Lasse , Andersen Torben O. , Pedersen Henrik C. , Bech Michael M.
Published: November 2012

This paper presents the development of a sliding mode control scheme with chattering elimination, generally applicable for position tracking control of electro-hydraulic valve-cylinder drives. The proposed control scheme requires only common data sheet information, no knowledge on load characteristics, and employs piston- and valve spool positions- and load- and supply pressure feedback. The main target is to overcome problems with linear controllers deteriorating performance due to the inherent nonlinear nature of such systems. In order to accomplish this task, an integral sliding mode controller is developed for the control derivative based on a reduced order model. Simulation results demonstrate strong robustness when subjected to parameter perturbations and that chattering is eliminated.
The Feature Extraction of Rolling Bearing Fault Based on Wavelet Packet-EMD Energy Distribution
Authors: Wen Cheng , Zhou Chuan De
Published: November 2012

The new signal analysis method based on the combination of wavelet packet and empirical mode decomposition (EMD) energy distribution was proposed for rolling bearing vibration signal presenting modulating characteristic, non-stationary characteristics and containing a lot of noise characteristics. In this method, initial vibration signal was decomposed first by wavelet packet to extract the resonance signal with obvious modulating characteristics. Then the resonance signal was decomposed by EMD method and energy distribution of each Intrinsic Mode Function (IMF) was obtained. Finally the IMF component, which can reflect the vibration condition, was processed by Hilbert envelope demodulation to extract rolling bearing fault characteristics information. The application analysis of the simulation signal and fault signal of inner race, outer race and rolling element of rolling bearing shows that this method can effectively analyze rolling bearing fault information and realize the fault diagnosis.
Investigation of Pantograph Effect on High-Speed Train Noise
Authors: Zhang Xiao Feng , Xiao You Gang , Deng He Lian , Huang Jian Feng
Published: November 2012

Using microphone and removable planar microphone array, the exterior and interior vehicle noise near pantograph were investigated when the train ran at 250-350km/h, the noise spectrum characters of these areas were obtained. The results show that at the pantograph seat and in the vehicle below pantograph, the noise spectrum show a broad band distribution, and the noise energy is mainly concentrated within the range of 100Hz-2kHz. Interior vehicle noise below pantograph is a non-uniform reverberant sound field, the regions with larger sound pressure level (SPL) are distributed near the roof, the floor, the side wall below the luggage. For reducing interior vehicle noise below pantograph, such measures as using low noise pantograph, adding sound insulation pad, filling sound absorption materials and improving sealing performance should be taken, and these measures should be effective at 100Hz-2kHz.
Test and Analysis on Motorcycle Noise by Synthesized Transmission Route Method
Authors: Huang Qi , Wen Tong , Liu Cheng Kei , He Zeng Long
Published: November 2012

The noise sources were tested and analyzed by SQLab II system on one typical motorcycle. The states of sound pressure levels are predicted by the synthesized transmission route method on different noise sources which are located at the standard position. Compared with different shield states, the results show that noise from the exhaust system is the main source and noise in high-frequency not only makes great contribution to all noises about sound quality, but also has bad influence on people’s subjective judgment.
Finite Element Analysis for Mechanical Characteristics of Resistance Spot Welding Process with Three Sheets Assemblies
Authors: Lei Zhen Zhen , Kang Hong Tae , Wang Jiu Hua , Ren Lian Cheng , Liu Yong Gang
Published: November 2012

This project is focused on the finite element (FE) analysis for mechanical characteristics of resistance spot welding (RSW) process with three sheets stack up instead of conventional two sheets assemblies because of its wide application in automobile industry. It is proved that the protuberances region localized in the nugget area induced in the welding process are more inclined to have fatigue failure such as cracks and fracture. Local stress and strain distributions for three sheets stack up under quasi-static tension load are investigated by both experiments and FE analysis with commercial software code ANSYS and NASTRAN. The high stress/strain value is concentrated at the edges of nugget instead of nugget center from cross section view and stress/strain distribution at the center region of the weld nugget is relatively low. The FE analysis has effectively verification with the experiments results.
Study on the Safety Design of Main Arm Mechanism in Slag Pot Carrier
Authors: Guo Rui , Zhao Jing Yi , Han De Cai , Wang Yong Chang
Published: November 2012

According to the new kind of the upper arm mechanism of the slag pot carrier, optimization design, simulation and experimental research are carried out, in which the combination of conventional design, three dimensional virtual design and experimental study are applied. The motion law of multi-segment arc slide way of main arm is given by means of researching the motion process of slag ladle in the main arm slide way. The functional relationship among the internal parameters of the arm mechanism, and between load force and arm movement is revealed by studying kinematics of mechanism and dynamics law of the upper arm mechanism. The finite element analysis of the upper arm mechanism is carried out to get the weak links of structure strength, and then the improvement solution is proposed. After experiments, the method correctness of optimization and design of upper arm mechanism is testified by the coincidence of the trial results and experimentation results.
Three Dimensional Simulation and Repair of Skull Maxilla and Dentition Based on CT Scanning and Laser Sintering Technologies
Authors: Wang Xiao Rong , Chen Shi Wei
Published: November 2012

Obtain a prosthesis and carry out maxillofacial repair by rapid prototyping technology on the basis of three dimensional finite element model of maxilla skull and dentition which is obtained through preliminary restoration done on a skull exemplar as modeling material and through spiral CT scanning and three dimensional imaging technologies. Thus, a vivid restored three dimensional biomechanical model and prosthesis of maxilla skull and dentition is obtained, based on which, the form and functions can be restored well after repair. Individual defect model and prosthesis model can be built according to different plans designed for different patients. By which, a complete idea for maxilla and dentition repair can be achieved with pleasing in appearance on patients, low cost and less post-operative complications.
Theoretical and Experimental Analysis of the Influence of Abrasives on Nozzle in Pre-Mixed Abrasive Water Jet
Authors: Jiang Yu Ying , Gong Lie Hang , Wang Hai Tao , Gong Cong Cong , Xu Xin Lin
Published: November 2012

This paper introduces the influence of the shape, grain size, density and hardness of abrasives particles on nozzle wear. Different parameters of abrasive hardness are investigated through theoretic and experimental analysis. The results show that the ratio of abrasive hardness to nozzle material hardness governs the wear rate Ca.
Effect of Viscosity on the Separation Ability of a Hydrocyclone
Authors: Ren Lian Cheng , Meng Jiang , Lei Zhen Zhen , Wang Jiu Hua
Published: November 2012

On bases of numerical simulation and theoretical analysis, two cases of media, water and slurry (a kind of pseudoplastic power-law fluids), were used in the same hydrocyclone under the same operating condition. The Compare results show that the effect of the medium viscosity on the radial-velocity profile is slight; on the other hand, the effect of the media viscosity on the tangential-velocity profiles is important. The increase of the media viscosity produces not only the increase of the viscous resistance but also the steep reducing of the peak value of tangential-velocity profiles, which means that the inward viscous force loading upon the particles are enforced, on the other hand , the outward centrifugal force loading on the particles reduces greatly. The increase of the media viscosity leads to the great decrease of the separation ability of a hydrocyclone.
Influence and Utilisation of Pressure Propagation in Pipelines for Secondary Controlled Discrete Displacement Cylinders
Authors: Hansen Rico H. , Hansen Anders , Andersen Torben O.
Published: November 2012

Efficient discrete force control of cylinders may be realised by having multi-chambered cylinders, where the pressure of the chambers are shifted between fixed pressure levels of a secondary controlled system. However, the pressure shifting on a volume where the dynamics of pressure propagation is negligible have been be proven to have an unavoidable minimum loss due to the compressibility of the fluid. This paper investigates the effect of the pressure propagation in the connection and concludes that except more complex shifting schemes are introduced, the minimum loss remains unchanged. The paper analysis however also demonstrates and suggests, that with a clever valve control and shifting scheme, increased efficiency of a shift is obtainable by utilising the pipeline inductance.
Design and Analysis of Nut Crimping Machines
Authors: Wei Zhou Ling , Fu Bo
Published: November 2012

In view of the growing market demand for self-locking nuts and the relative backward processing technology, a nut crimping machine was studied. According to the working principle of nut crimping and performance requirements, the body structure of the nut crimping machine was designed. The stress analysis of the main stressed components was performed using simulation Xpress function of SolidWorks. Results show that body structure has high strength and rigidity. Based on electro-hydraulic proportional technology, the hydraulic control circuit was developed. The design results improve the control precision on speed and pressure of the nut crimping machine and ensure the quality of self-lucking nuts.
Analysis of Internal Flow Field for Centrifugal Fan in Series
Authors: Fan Ya Jun , Xu Zhang , Wensi Ding
Published: November 2012

Centrifugal fan in series with high wind pressure is the key facility of pneumatic transport equipment. To consider the impact of changed conditions on performance of centrifugal fan, internal flow of three-stage centrifugal fan at rated speed in different total pressure conditions is analyzed by CFD software FLUENT6.3 in this paper. Flow characteristics are obtained and the differences of total pressure and velocity distribution in each impeller are analyzed under different conditions, velocity distribution on the meridian plane and section of wind guide plates are compared. Finally, curves of P-Q and P-η at 4600 r/min are forecasted through the analysis of the data, which provide references for reducing impact that condition alteration on fan performance and improving the efficiency of the fan.
Multi-Objective Optimization of Filament Wound Composite Pressure Vessels Based on Weight and Matrix Cracking/ Burst Pressure Using Imperialist Competitive Algorithm
Authors: Abdi Behzad , Ismail Yob Saed Bin , Amran Ayob , Abdullah R.A. , bin Yahya Mohd Yazid
Published: November 2012

The most important concern in design of filament-wound composite pressure vessels reflects on the determination of the optimum shape and optimum laminate stacking sequence of composite vessels based on the matrix cracking pressure and burst pressure of composite laminates. In this study the Imperialist Competitive Algorithm (ICA) is used to find the optimum laminate stacking sequence of composite vessels that the design considerations are stability and strength constraints. the matrix cracking pressure of filament-wound composite pressure vessels made of different number of helical layers and different layers of Circumferential layers was calculated by using orthotropic material formulae and then, the burst pressure of composite vessels was calculated by using netting analysis. The optimum laminate stacking sequence of filament winding composite was found to maximize the matrix cracking pressure and the burst pressure by using Imperialist Competitive algorithm.
Effect of Aluminium Alloy and Mild Steel on the Productivity in Sheet Metal Forming Processes
Authors: Kumar C.N. Ashok , Deivanathan R.
Published: November 2012

Productivity is one of the major factors that affect the profit of any industry or any product. In manufacturing industries, the productivity is showing the efficiency of the production unit. It depends on many factors such as technology, machine, method, management, materials etc. In this study, material used is considered and analyzed how it affects the productivity. Productivity is normally expressed as the number of units produced / unit time. Sheet metal forming is one of the major manufacturing processes and used for most of the products. So the selection of material is important for good quality as well as economical production. This article discusses how the material influences the productivity. For this study, a product U Clamp is considered. The materials considered for the study are the aluminum and mild steel. The U clamps are formed by aluminum as well as mild steel by using the same die. Data on operation time, material handling time are collected, analyzed and discussed.
Biomechanical Assessment of Unconstrained Elbow Prosthesis after Total Elbow Replacement: A Finite Element Analysis
Authors: Heidari Milad , Kadir Mohammed Rafiq Abdul , Fallahiarezoodar Ali , Harun Muhamad Noor , Alizadeh Mina , Kashani Jamal
Published: November 2012

Total elbow arthroplasty has shown acceptable results to relieve pain, developing range of motion and treating diseases which cause severe joint destruction. The objective of this study is analysis of the stress distribution on unconstrained elbow prosthesis during the flexion motion along with the analysis of the effect of medial and lateral collateral ligaments. A three dimensional model of elbow joint and unconstrained elbow prosthesis was developed. Flexion active muscles' forces were assigned to the model for two different 30 and 90 flexion. Results show increasing the flexion angles decrease the stress of articular surfaces. Furthermore, results demonstrate the effect of ligaments on stress magnitude and distribution in implant is significant.
Effect of Machining Parameters on Cutting Force when Turning Untreated and Sb-Treated Al-11%Si-1.8%Cu Alloys Using PVD Coated Tools
Authors: Barzani Mohsen Marani , Noordin Mohd Yusof , Farahany Saaed , Ourdjini Ali
Published: November 2012

One of the important aspects of machining is the measurement of the cutting forces acting on the tool. The information of forces is required for evaluation of power requirements, designing tool holder, machine tool elements and fixture. In this research, the effect of cutting condition on cutting force when turning untreated Al-11%Si-1.8%Cu and Sb-treated alloys was investigated. PVD TiN coated insert as cutting tool under oblique dry cutting process utilized. Experiments were conducted at three different cutting speeds of 70, 130 and 250 m/min with feed rates of 0.05, 0.1 and 0.15 mm/rev, whereas depth of cut was kept constant at 0.05 mm. The results revealed that turning of Sb-treated alloys requires higher cutting force in comparison to untreated alloy. The cutting force values increased about four times with increasing feed rate from 0.05 mm/rev to 0.15 mm/rev. Furthermore, the cutting force decreased with increasing cutting speed from 70 m/min to 250 m/min.
Dynamic Nonlinear Analysis of an Hybrid Base Isolation System with Viscous Dampers and Friction Sliders in Parallel
Authors: Cancellara Donato , de Angelis Fabio
Published: November 2012

In the present work we have analyzed a particular base isolation system for the seismic protection of a multi-storey reinforced concrete (RC) building. The viscous dampers and friction sliders are the devices adopted in parallel for realizing the base isolation system.
The base isolation structure has been designed and verified according to European seismic code EC8 and by considering for the friction sliders the influence of the sliding velocity on the value of the friction coefficient. A dynamic nonlinear analysis for a three-dimensional base isolated structure has been performed. Recorded accelerograms for bi-directional ground motions have been used which comply with the requirements imposed by EC8 for the representation of a seismic action in a time history analysis. In this paper a comparative analysis is presented between the base isolated structure with the described hybrid base isolation system and the traditional fixed base structure.
Guaranteed Cost Control of Saturated Time-Varying Delay Systems
Authors: He Han Lin , Wang Xiao Dong , Li Wei Jun
Published: November 2012

This paper mainly considers the control problem of saturated time-varying delay systems. Applying the saturation degree function and the convex hull theory to handle the saturated terms, we put forward the guaranteed cost controller of the system according to the Lyapunov-Krasovskii theorem. Then we make use of Schur complement to convert the QMI (quadratic matrix inequality) to a LMI (linear matrix inequality) and so it can be easily used as controller synthesis. Finally, we apply the guaranteed cost controller to a two dimentional time-varying delay cellular neural networks, and the simulation results show the effectiveness of the proposed controller.
A Remote Intelligent Control Method Based on the Thermal Comfort Model
Authors: Ding Jie Min , Li Zhen Zhong , Li Wei Bo , He Pin
Published: November 2012

In order to improve thermal comfort and avoid manually controlled split air conditioner, this paper proposes a remote intelligent control method based on the thermal comfort model. It first carries out an analysis of the thermal comfort model and simplifies objective function of the thermal comfort model, which contains only the temperature, humidity and the airflow rate of 3 parameters. In order to get the data of the three parameters of the environment the paper designs an intelligent control device with sensors and also provides the artificial immune method to optimize these three parameters. The test results show that the three parameters obtained in this paper are feasible and effective for the split air conditioner intelligent control. And this method can also be used for other similar equipment control system.
Research on the Demand Forcast of Beijing Car Rental Industry Based on System Dynamics
Authors: Wan Feng Jiao
Published: November 2012

In order to take full account of the various factors in the car rental system, in this paper, the system dynamics method is applied to the car rental industry demand forecast.First, we analyze the main factors of the car rental system and its causal relationship, and then establish the dynamic model of the car rental system .The final model was validated using the Beijing car rental industry statistics .
The Computer Aided Design Intelligent Design System of Threshing Parts of Combined Harvester
Authors: Yu Fei , Feng Tian Yu
Published: November 2012

The TLCADS(The Computer Aided Design Intelligent Design System of Threshing parts of Combined Harvester)which is developed by adopting the principle of expert system, parameterization design method and database technology, can greatly improve the efficiency and quality of the design of Threshing parts of Combined Harvester with the functions of general parameterization design,systematic of components,engineering drawing and computer analysis.
Complex Event Processing Mechanism in Internet of Things and its Application in Logistics
Authors: Wei Chun Mei
Published: November 2012

The data and events from Internet of Things are mass but their semantic information is very simple and can not be utilized in upper applications directly, so we have to analyze lots of data to find out useful business logic in these events. To aggregate these simple basic events into advanced events, a hierarchical model was designed to process RFID data stream, in which a complex events processing (CEP) mechanism was used to analyze atomic events in RFID data. We defined event handling operators in CEP mechanism to process business logics. As an example, the CEP was used in a logistic application, which implemented logistic events aggregation and complex events processing effectively. The result indicates the CEP mechanism is an effective approach to handle data and events in Internet of Things.
Telemedicine Information Demands of Chinese Elderly People in the Future: Examination of Effectiveness in Applications
Authors: Shi Wei Xing , Liu Man Cheng
Published: November 2012

China had embarked several initiatives to take care of its aging population where modern and emerging information and communication technologies (ICT) had been heavily invested so as to use these technologies to enhance the life quality of its elders. By focusing on healthcare information domain, this paper attempted to forecast next generation of elderly information demands in the future, determining the effectiveness of using current & emerging ICT applications as a means to seek information. This was achieved by discussing the co-relationships between these technologies and adoption of elderly where the combined variables will influence the manner of elderly social behavior in receiving and sending information.
Semantic Business Process Integration in Cloud Manufacturing Paradigm
Authors: Zeng Yun Bo
Published: November 2012

Global competition in the manufacturing industry forces to build a cross-organizational business process cooperative environment, in which manufacturers can share and utilize distributed resources and competencies for rapidly and cost-effectively developing products. But the varying manufacturing resources are heterogeneity which limits the business process execution in an automated way. This paper presents an approach for cross-organizational business processes integration in the cloud manufacturing paradigm. The main idea is to encapsulate an organization’s resources and competencies within appropriate interfaces and advertise it as semantic web services, called manufacturing service. An executable business process is achieved by manufacturing services composition. We give a detailed presentation of the cloud manufacturing service model. Semantically description of service not only contains resources’ capability, but also is considered as mediators to bridge the gap between the modeled processes and their implementation. The main integration process is introduced based our approach.
A New Reachability Query Method for Graph-Structured XML Data
Authors: Lu Yan , Ma Fu Ning , Chu Shan Zhong
Published: November 2012

Query processing of graph-structured XML data is a rising topic in XML research field. This paper focuses on reachability query methods of graph-structured XML data. Encoding scheme of CDGX (Coding Directed Graph-structured XML data) is proposed in this paper, which not only can effectively solve the circle problem, but also avoiding a large number of intermediate data and saving storage space. And based on encoding scheme of CDGX, a new reachability query method RJDG (Reachability Judgment on Directed Graph) is put forward to. In RJDG, adjacent nodes in a same graph-structured XML document are got and stored beforehand. RJDG only needs to deal with the adjacent nodes to decide the reachability relationship between XML nodes. Experiments illustrate that RJDG is an efficient reachability query method.
Development of an Instrument for Machine Equipment State Inspection and Safety Evaluation Based on Embedded Technology
Authors: Chen Lei , Han Jie , Li Ling Jun , Hao Wei
Published: November 2012

In modern industry, plant equipment must be maintained effectively to guarantee safety operation. An intelligent instrument for plant equipment state inspection and safety evaluation was developed based on embedded technology. Firstly, the overall structure of the instrument system was introduced. Then the mainboard circuits were designed based on ARM core microprocessor. The control logics of the dynamic machine signals acquisition subsystem were designed by using of a complex programmable logic device. After that, the embedded operating system was transplanted and device drivers were programmed. Finally, the functions of the applications were stated. The designed instrument can meet the needs of the vibration acquisition of the rotating machines satisfactorily and provide effective means for equipment maintenance.
A Threshold-Based Improved Algorithm of PTS
Authors: Zhang Hua Wei , Li Nan
Published: November 2012

Compared with the single carrier systems, orthogonal frequency division multiplexing (OFDM) has many advantages of higher bandwidth efficiency and stronger anti-multi-path ability. However, OFDM technology also has some disadvantages, including the multi-carrier synchronization and higher peak-to-average power ratio. In order to solve the higher peak-to-average power ratio problem, this article combines the double-level optimal search method and Kwon suboptimal method, proposes a threshold-based double-level optimal search algorithm. The method is an improved PTS algorithm and is a linear process. The simulation proves that, with the same optimization grouping parameters and auxiliary information, the new algorithm with a reasonable threshold, which has a smaller loss of reducing PAPR performance, greatly reduces the system complexity.
Comparison and Simulation of Subpixel Imaging Modes for Linear CCD
Authors: Li Ya Peng , He Bin , Liu Ting Yu
Published: November 2012

Subpixel technique of linear CCD is effective to enhance the spatial resolution without increasing the focal length of optics and reducing the pixel size. To compare image quality of two main subpixel imaging modes, quincunx sampling and four-point sampling, a method to quantitatively evaluate image quality of subpixel based on MTF was proposed. The MTF of quincunx and four-point sampling modes were derived. Analytical results shows that theoretical limiting resolution of quincunx sampling and four-point sampling is improved to 1.4 and 1.86 times respectively, and MTF values at Nyquist frequency of two modes are increased by 0.1106 and 0.1679, respectively. MTFA in (0, 0.5) of two subpixel imaging modes were calculated and results illustrates that four-point sampling offers much more improvement with image quality than quincunx sampling, at the cost of double amount of data. A model for simulating subpixel imaging using Matlab was established, and simulation results of spoke target verify the theoretical analysis.
Identifying the Attractive Attributes of the Massively Multiplayer Online Role-Playing Game Designs
Authors: Chen Chun Chih , Lin Han Yu
Published: November 2012

The Massively Multiplayer Online Role-Playing Game (MMORPG) industry is growing rapidly. A MMORPG is composed of many design attributes; therefore, the game developers cannot satisfy all of the design attributes due to the constraint of development resources and the time-to-market pressure of the product. The purpose of this study is to help game developers to make the trade-off decision of where to invest their limited resources to implement critical design attributes. To better understand the relationship between attributes performance and satisfaction, the two-dimensional quality model, Kano model, is applied to identify the key attributes in satisfaction. Results indicated that these design attributes of MMORPGs were classified into different quality categories, including attractive, one-dimensional, must-be and indifferent qualities. By applying the Kano quality classifications, the attractive and important design attributes can be identified. It also can help game designers determine the priority to resolve the trade-offs dilemma in multiple-attribute optimization of satisfaction for MMORPG design.
A New Simple Micro-PSO for High Dimensional Optimization Problem
Authors: Han Wen Hua
Published: November 2012

The particle swarm optimization (PSO) algorithm is a population-based intelligent stochastic search optimization technique, which has already been widely used to various of fields. In this paper, a simple micro-PSO is proposed for high dimensional optimization problem, which is resulted from being introduced escape boundary and perturbation for global optimum. The advantages of the simple micro-PSO are more simple and easily implemented than the previous micro-PSO. Experiments were conducted using Griewank, Rosenbrock, Ackley, Tablets functions. The experimental results demonstrate that the simple micro-PSO are higher optimization precision and faster convergence rate than PSO and robust for the dimension of the optimization problem.
The Parametric Simulation Design Method of Conjugate Cams of Automatic Pin Insertion Machine Based on Creo Parametric Software
Authors: Liu Qing Li , Shen Lei , Tsai Albert , Yao Su Fen , Wang Edmund
Published: November 2012

Cam mechanisms are widely used in automated machines. Conjugate cams have become popular for its eminent kinematics and dynamic performance in research and in industry. As a commonly used cam mechanism in industry, especially in automatic pin insertion machines, conjugate cams have the advantages of being highly efficient, highly accurate and relatively cheap. A parametric simulation method was used to create a conjugate cam profile. This paper describes the steps used to create 3D models of the conjugate cam and the basic principles used to simulate the motion of cam mechanisms. The motion simulations were done with the parametric 3D modeling method using Creo Parametric Software.
A Research Concerning a Distributed Automation Scheme for 10kV Aerial Wire with Grounding Protection
Authors: Shi Xin Li , Ye Jun , Lei Jian , Guo Min Yi , Zhang Zhan Long , He Wei
Published: November 2012

This paper puts forward a distributed automation scheme with grounding protection for 10kV aerial wire, which is based on the outgoing line and feeder circuit breaker in substation, the intelligent column circuit breaker and the intelligent load switch. Though the outgoing line and feeder circuit breaker in substation, the intelligent column circuit breaker and the load switch cooperating with each other, Which could isolate and exclude the aerial wire transient fault automatically, and isolate the permanent fault immediately. Practical application results show that the application of the scheme have reduced the hours of power failure, reduced maintenance time and improved the stability of the system.