bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Mixed Convective Heat Transfer on Interior Helium Temperature of High-Altitude-Cruising Airships
Authors: Yang Yong Qiang , Ma Yun Peng , Wu Zhe
Published: December 2013

This paper aims to establish a thermal analysis model for stratospheric airships. Mixed convective heat transfer between envelope and air has been specially considered. Thermal analysis of HAB on the summer solstice was carried out in this paper, results show that forced convective heat transfer coefficient increases obviously as the air speed decreasing, which will enhance the heat transfer between envelope and atmospheric. The pressure difference decreases obviously as air speed increasing during the whole day. Therefore HAB(high altitude balloon) should increase the air speed to reduce the pressure difference, which will enhance the safety of HAB.
The Cutting Tool Wear of the Cutting Tool Part of the Cast Iron GTW 35-04 during Drilling
Authors: Jurko Jozef
Published: December 2013

The basic hypothesis of this article focuses on the study changes in the tool wear during drilling of cast iron GTW 35-04. The problem of drilling holes with diameter D=5 to 10 mm resides in the fact that 40 % of these holes do not comply with prescribed requested requirements. This article presents the results of experiments focusing on the study of the damage process in helical drills with diameter d=10.0 mm when drilling into the cast iron GTW 35-04.
Study on Application of the Mine Anti-Impact and Energy-Absorption Device
Authors: Ma Xiao , Pan Yi Shan , Xiao Yong Hui
Published: December 2013

This article touches on the problem that the shock occurs on support at the time of violent vibration and deformation failure of the surrounding rocks. According to the buckling principle, a thin-walled energy-absorption component is designed with special shape applied to a new roadway anti-impact and energy-absorbing hydraulic support in order to relieve excess load impact and injuring and damage by itself and the traits abdicating deformation process and when impact of surrounding rock occurring suddenly, thus preventing support system from the serious damage caused by rock burst. In the theory, simplified energy-absorbing component capacity and energy-absorption formula are obtained by the theory analysis, the effect of energy-absorption curve and the buckling deformation mode are obtained in the quasi-static compression test, results are almost the same with simulation and provide certain reference for the optimization design of support.
Preparation and Performance Research of the PBC / PLA Biodegradable Film
Authors: Gu Xiao Hua , Xu Bao Yun , Zeng Peng , Zhang Xi Wei , Liu Xi Jun
Published: December 2013

This paper mainly describes a novel biodegradable material poly (butylene carbonate) (PBC) to blending toughing modification for polylactic acid (PLA), and prepared the PBC/PLA biodegradable film) of improved toughness. To research the effect of thermol performance and mechanical properties (tensile strength and breaking elongation rate) through Fourier transform infrared spectroscopy (FTIR), differential thermal scanning calorimetry analysis (DSC) and tensile testing to expound different ratio of PBC and additive plasticizer, (lubricant and chain extender) .
Research on the Technology of Two-Axis Synchronization Control Based on Fuzzy PID
Authors: Lin Ning , Wang Wei Jun , Gu Xing , Shin Dong Ik
Published: December 2013

In this paper an technology of two-axis synchronization control based on Fuzzy PID is presented. With a hardware platform constructed by Linux EMC2 and MESA 5i20 motion controller, a two-axis synchronization control system is built up to study the synchronize precision and dynamic feature by adapting Fuzzy PID controller. The result of the experiment shows that the Fuzzy PID controller works well in the two-axis synchronization control system, and will become a reliable reference to the technology of two-axis synchronization control.
Application of Nondestructive Testing in Quality Controlling of High-Density Polyethylene Silicore Plastic Duct
Authors: Gong Bai Yan , Lu Yu Hong , Ren Juan
Published: December 2013

Some key quality problems has been exposed in several years of quality supervision sampling inspection of industry products for HDPE silicore plastic duct, such as dimension, breaking elongation, performance of falling weight impact and ring stiffness. Quality consistency is an important indicator in evaluating product quality. Nondestructive testing can be used to evaluate the quality of the whole pan and batch of silicore plastic duct, and it will play important role in product quality controlling.
The Methods for Increasing of the Efficiency in the Intelligent Assembly Cell
Authors: Holubek Radovan , Ružarovský Roman
Published: December 2013

Efficiency of industrial production lines is crucial as it results in an improved production and utilization of available resources. Industry companies are constantly looking for new ways to improve workplace efficiency. Manufacturing industry trends to employ more flexible assembly cells with changes in programs and configurations for robots, and to achieve a high manufacturing efficiency. The various problems inherent in current mechanized product assembly are outlined, and potential organizational, technological, and engineering measures aimed at increasing the efficiency of product assembly are examined. Future developments in automated assembly are predicted. In order to improve the effectiveness of the cell, it is important to recognize measure and reduce losses in the assembly cell. The most effective method is to analyze the OEE (Overall Equipment Effectiveness) of the cell. It is developed design of assembly system under the project an intelligent assembly cell at the Institute of Production Systems and Applied Mechanics where after process running and debugging, based on the process analysis was evaluated, it is necessary to increase the efficiency of the cell. Deployment of monitoring, visualization and simulation are predicted defects that reduce overall system effectiveness. The project is aiming to develop an efficient intelligent manufacturing system integrating real time data collection, simulation, optimization and synthesis.
Research on Software Programming Automatically from Movement Sequence Based on Multi-Node System
Authors: Wen Jin Hua , Zou Kun , Shi Ruo Chen
Published: December 2013

The computer control software is becoming complicate, to simplify the development of software, this paper proposes: the background control module of the control software is built automatically by a compiler according to a text descripting the nodes movement sequence, then the background control module and the interface are linked by shared variables. The method proposed is achieved by LabVIEW in the end.
The Model of Load-Shedding Determined in Power Market
Authors: Cao Yong , Tan Lun Nong
Published: December 2013

In power market environment, the first goal of grid company is to maximize its profits, which is different from the traditional power system. The security and reliability of power system should be subordinate to this goal. This paper proposes that, in power market environment, the power interruption acceptable to both supply and demand sides should be regarded not as damage to secure and reliable operation, but as continuity of power supply. In this point of view, the paper proposes how to use load-shedding in power trade market and reserve capacity to maximize economic benefit. The analysis of the mathematical model and simulated results show that the method is feasible and economic.
Application of the Minimum Cut Sets of System Fault Based on OMA
Authors: Liu Tie Lin , Zhang Cheng
Published: December 2013

Oriented matrix analysis (OMA) method of system reliability is discussed. OMA uses an oriented fault graph instead of traditional fault tree model. By defining the specially logic operation and calculating reachability matrix, the cut sets can be formed directly and the minimum cut sets can be derived easily. An example is proposed at last, which verifies the efficiency of the proposed method.
Model Research of Concrete Reinforcement Corrosion Mechanism and Corrosion Rate under the Corrosion of Chloride Ion
Authors: Hao Bao Hong , Zeng Ding , Li Hang , Cheng Yu Xue , Dou Yan Tao
Published: December 2013

This paper researches law of reinforcement corrosion under chloride environment based on method the simulated accelerated test. Test the self-corrosion current density and electrode potential quantitative index of concrete reinforcement under chloride environment and establish quantitative model of corrosion time and reinforcement corrosion quantity by means of advanced linear polarization method and electrochemical testing method. Corroded reinforcement weight loss ratio under chloride environment is detected in physical way, combined with reinforcement corrosion layer microstructure and composition characteristics detected by scanning electron microscope. Both of the above deeply reveals corrosion mechanism and corrosion characteristics of the reinforcement. Corrosion rate theoretical model and statistical model have been revised. The research results prove that reinforcement corrosion rate has increased by an average of 4-5 times under chloride environment, weight loss ratio has increased by 15% compared with that under no-chloride environment, and due to chlorine’s effect, partial and uneven corrosion rust layer appears on surface of the reinforcement, which will be the direct cause of inducing accelerating corrosion of reinforcement at the later stage.
Influence of Damping on Seismic Strength Reduction Factors: A Study Differentiated by Ground Motion Frequency Bandwidth
Authors: Craifaleanu Iolanda Gabriela
Published: December 2013

Building design codes typically specify seismic forces based on a 5-percent damped elastic design spectrum. To consider the case of structures with damping ratios other than 5%, damping correction factors are used. While these factors are determined for elastic systems, several studies have shown that the effects of damping are different for systems with nonlinear behavior. A study concerning the influence of damping on the nonlinear seismic response of building structures is presented. To separate the influence of nonlinear behavior, spectra of the ratio between the seismic strength demands corresponding to nonlinear and linear behavior, respectively, were computed, for damping ratios ranging between 2% and 10% and various constant ductility values. A database of ground motion records from the three strongest earthquakes that affected Romania during the last four decades was used in the study. The records were grouped into two sets, according to their frequency bandwidth. The spectral values computed for each set were processed statistically and results were expressed with reference to the 5%damped spectra. It was found that, for the analyzed damping range, the influence of this parameter on the nonlinear response is weak to moderate, for both considered types of frequency content.
Analysis on Nonlinear Curvature Deflection for Reinforced Concrete Two-Way Slabs under Uniformly Distributed Load
Authors: Huang Ying , Guo Pan , Tong Zhi Neng
Published: December 2013

Reinforced concrete two-way slabs are widely used in industrial, civil, public buildings. However, the calculation method of curvature of deflection wasn’t clearly put forward in Code for design of concrete structures in China. Considering the nonlinear characteristics of concrete and bidirectional bending the formula of curvature deflection for reinforced concrete two-way slabs was derived based on plate theory in this paper. The iterative method is adopted in order to solve stress and strain of reinforced and concrete in reinforced concrete two-way slabs. The whole calculation process was realized by MATLAB software programming. The correctness of method in this paper was confirmed by comparing the results and the test data of the literature.
Seismic Analysis of a Water Release Integrated Structure Part I: Response Spectrum Analysis of Intake Tower
Authors: Wang Yong , Lin Zhen Ting , Song Chao , Dong Bo Ya
Published: December 2013

The stress, deformation and stability for the intake tower of a water release integrated structure under the normal storage water level and operational basis earthquake load case are investigated using the three dimensional finite element method. The response spectrum analysis is adopted to study the seismic response of the intake tower. Special attention is paid to the weak zones of the structure and foundation. The safety evaluation of the intake tower is performed based on the computational results.
Hemisphere-Shaped Iron Joint between PHC Pile and Steel Reinforced Concrete Column. Part II: Experiment
Authors: Lee Yeun Seung , Oh Jin Tak , Ju Young K.
Published: December 2013

In Part I, to have an environmental-friendly, highly durable, cost saving, and easily constructible method in top-down construction, one prototype of a joint of PHC pile to column was suggested on the basis of analytical studies. In this paper, structural performance of such joint of PHC pile to column is experimentally analyzed with regard to axial strength and strains.
Discussion of Method for Computing Temperature Load during Operation Period on High Arch Dam
Authors: Wang Zhi Qiang , Wu Xiao Bin
Published: December 2013

According to the existing arch dam design specification, the temperature load is obtained based on analytic solution of infinite long free plate, it only considers the average temperature and the equivalent linear temperature difference of dam section in operation period, the influence of non-linear temperature difference has not been considered. This kind of simplification has some approximation; especially it can not reflect spatial effect of larger temperature gradient changes in the upstream and downstream water level change area. This paper first takes the free plate as an example, has calculated the temperature field corresponding to analytical method, finite element method, standard method, explains the rationality of using written program to carry on finite element analysis. On this basis, take Xiluodu arch dam as an example, the dam temperature load and temperature stress has been analyzed by using finite element method and standard method, the difference between both has been discussed
Trenchless Repair Technology and Application of Urban Sewer System
Authors: Li Jun , Zhou Ming , Si Ya Nan , Li Jia Jia
Published: December 2013

With the constant expansion of urban construction, the rapid development of urban underground pipeline becomes complex. Due to disrepair, improper maintenance and management and other factors, the urban sewer appears varying degrees of damage phenomenon. Therefore, the urban underground sewer repair becomes an urgent problem. This article introduces the methods of trenchless pipe rehabilitation technology and developments at home and abroad. It also elaborates the technology design points of stainless steel foam cylinder repair, combining with engineering examples.
Basic Investigation of the Acoustic Environments in Hospital Waiting Areas
Authors: Din Nazli Bin Che , Ngoh Wong Shiang , Ismail Puteri Sharina
Published: December 2013

In this study, the investigations of the acoustic environments in the waiting areas in hospitals were conducted. The investigations were aimed on clarifying the actual conditions in two waiting areas in two hospitals in Kuala Lumpur. The investigations consist of both noise level measurements and questionnaire surveys, i.e. both physical and psychological aspects. Generally, physical aspects for both hospitals are strongly influenced by noise produced during general activities in waiting areas. Sound pressures data were collected approximately eight hours period in daytime and converted into different levels (LAeq and Leq, max). It was found that the maximum permissible sound level LAeq in all waiting areas measured exceeded the guideline for community noise recommended by World Health Organization (WHO). In psychological aspects, respondents were interviewed in the course of a questionnaires survey dealing with nuisance occasioned by noise at actual conditions. Accumulate measured data is important for the further discussions and developments to overcome the problem. This paper gives a fundamental data for the help of future refinements.
Unattended Noise Monitoring: How to Fulfill IEC 61672 Sound Level Meter Standard for 0 Degree and 90 Degree Reference Directions with the Same Device
Authors: Pischedda Patrice , Aflalo Erik
Published: December 2013

Unattended noise measurements are more and more common for noise assessment in the environment. Multiple sources are usually measured with a random position with respect to the measurement point. Noise generated by ground transportation, leisure activities, construction sites is coming from all directions, although mainly the horizontal direction. Placed vertically and configured for a reference direction of 90° from its axis, the goal is to meet the requirements of the IEC 61672 standard on sound level meters taking into account noise incidence from the horizontal direction. The main technical difficulty is the criterion for the maximum level difference allowed between two random incidence angles (directivity). The objective can be fulfilled using a cone-shaped device on top of the microphone. When measuring attended noise with the instrument in hand, the sound level meter must be pointed at the source according to standard IEC 60651. The purpose of the paper is to describe the different research & development phases to fulfill IEC 61672 sound level meter standard for 0° and 90° reference directions with the same device.
A Preliminary Study on Motorcyclists' Perceptions of Fatigue Risk Factors
Authors: Khamis N.K. , Deros Baba M. , Nuawi Mohd Zaki
Published: December 2013

Fatigue can be defined as a feeling of drowsiness or sleepiness, tiredness, boredom, or an inability to focus and a mental sluggishness. The aim of the present study is to discover the general perceptions on fatigue risk factor of teenage motorcycle riders in an urban city in Klang Valley, Malaysia. Respondents provided feedback through questionnaires that were developed based on the Motorcycling Fatigue Model and other practices in existing empirical studies. In addition, the questionnaire highlights 18 statements that cover two main components, namely, vehicle or environment factors and rider factors. All the 60 respondents in this study habitually ride various types of motorcycles as their main transportation from and to their homes and offices. Findings indicate that poor road design is the primary contributor to fatigue, whereas driving early in the morning was the least contributor. Although the sample is quite small, the results of this study coincide with those of previous literature.
Preventing Drum Brake Squeal through Lining Modifications
Authors: Abd Rahman Muhammad Ridhwan , Vernin Gregory , Bakar Abd Rahim Abu
Published: December 2013

Drum brake squeal is one of the most common and annoying types of brake noise and it usually falls in the frequency range between 0.5-16 kHz. Brake squeal continues to confront vehicle manufacturers where it not only leads to significant increase in the warranty costs but also may affect customers perception on quality of the vehicle. Thus this paper attempts to prevent drum brake squeal by means of lining modifications. In doing so, finite element method is first employed and squeal noise will be then predicted using complex eigenvalue (CE) analysis. A good lining modification should be able to stabilize the drum brake assembly by shifting or reducing positive real parts toward zero or negative real parts in the eigenvalue analysis. Finally, laboratory squeal tests are conducted on the four proposed modifications to verify its effectiveness against squeal.
I-KazTM-Based Analysis of Cutting Force Signals for Tool Condition Monitoring in Turning Process
Authors: Rizal Muhammad , Ghani Jaharah A. , Nuawi Mohd Zaki , Che Haron Che Hassan
Published: December 2013

Cutting force is an important signal in machining process and has been widely used for tool condition monitoring. Monitoring the condition of the cutting tool in the machining process is very important to maintain the machined surface quality and consequently reduce inspection costs and increase productivity. This paper utilizes I-kaz-based analysis of cutting force signal to monitor the status of tool wear. The cutting force signals are measured by two channels of strain gauge that were mounted on the surface of tool holder. Experiments were carried out by turning hardened carbon steel and cutting force signals were analyzed using I-kazTM technique by integrating two component of signals (I-kaz 2D, Z2), I-kaz of cutting force (Z of Fy), and I-kaz of feed force (Z of Fx). The results show that I-kaz of feed force can be effectively used to monitor tool wear progression during turning operation.
Experimental Investigation of Low Speed Disc Brake Judder Vibration
Authors: Ishak Mohd Razmi , Abu Bakar Abd Rahim , Shamsudin Subki , Maskak Muhammad Husaini , Hamid Mohd Kameil Abdul
Published: December 2013

Brake judder is defined as disc or drum deformation-induced vibration which typically occurs at frequency less than 200 Hz. There are two types of brake judder namely, low speed (cold) judder and high speed (hot) judder. These two types of judder are often causing the brake pedal, steering wheel, suspension or chassis to vibrate. Consequently, it will affect comfort level of the driver and passengers. This paper focuses on the experimental investigation of low speed brake judder. In doing so, a laboratory test rig consists of disc brake unit, steering and suspension systems was used to assess level of brake judder vibration at different wheel turning angles. It was found that brake judder generated slightly high vibration at the steering wheel in the axial direction which led to a little uncomfortable feeling to the driver.
Modelling the Effect of Flexural Vibration on Sound Absorption of a Micro-Perforated Panel Using Wave Propagation Method
Authors: Putra Azma , Sajidin Py Muhammad , Salleh Norliana
Published: December 2013

Micro-perforated panel (MPP) is well known as the alternative green sound absorbing material replacing the synthetic porous absorber. Several works have been established which model the sound absorption performance of the MPP with various arrangements. However, most existing models are for MPP with rigid condition and rarely discuss the effect of vibration due to the impinging sound. In this paper, a simple approach using wave propagation technique is proposed to take into account the effect of flexural wave in the MPP on its sound absorption. The model begins with an MPP coupled with a solid panel separated by an air gap. The impedance of the back solid panel can then be adjusted to a very large value to simulate a rigid wall.
Passive Damping Treatment on Aircraft's Non-Flush Patch Repair Scheme
Authors: Tahir Mohd Salleh Bin Mohd , Manar Gunasilan , Koslan Md. Fuad Shah , Abdullah Shohaimi , Ahmad Mujahid Ahmad Zaidi
Published: December 2013

The majority of aircrafts structure cracks due to fatigue are thin gage metallic structures and secondary support structures. Beside lower fatigue strength, they may also occur due to mechanical defects, especially at weak area and for areas exposed to high repetitive force such as vibration, friction, acoustic load and tensile force. Normally, the Original Equipment Manufacturer (OEM) recommended the aircraft operator to repair the crack by typical patch or doublers repair technique which is formally known as Non-Flush Patch RepairScheme. However, the crack tends to reappear and tend to be more severe. The natural frequency and damping ratio of a structure which is treated with Typical Non-Flush Patch Repair, with and without Passive Damping Treatment (PDT) are studied using impulse based technique. Experimental data are presented to demonstrate the difference of damping ratio (ζ) among the test specimens. The cracked structure which has been treated with PDT on Non-Flush Repair Scheme has a better damping ratio and resonates at a different natural frequency. The experiment data generated from this study can be used as a basis to further the study on aircrafts structural repair scheme.
Application of In Situ Method for Measuring Sound Absorption Coefficient of Direct Piercing Carved Wood Panel with Daun sireh Motif
Authors: Jusoh Mohd Zamri Bin , Dimon Mohamad Ngasri , Din Nazli Bin Che , Otsuru Toru , Yeow You Kok
Published: December 2013

An application of In-Situ method of measuring sound absorption coefficient on the surface of direct piercing carved wood panel using the concept of ensemble averaged is discussed. The method offer an easier way to measure the absorption performance for each individual aperture of carved wood panel with floral pattern which was replicated from one of the oldest mosque, namely Masjid Abidin located in Terengganu, Malaysia. Two pieces of 20 mm thick of cengal wood (Neobalanocarpus heimii) with 30% and 40% perforation ratio were respectively measured in a reverberation room in order to determine the value of . At lower frequencies (0.1 kHz-1.5 kHz), the measured values of for both direct piercing carved wood panel with floral pattern (Daun Sireh motif) are shown that the sound absoption for both direct piercing carved wood panel are in perform level. From the measurements, clearly, the installation of the direct piercing carved wood panel with floral pattern (Daun Sireh motif) in the Masjid Abidin can provide better air circulation and additional natural sunlight, as well as better sound intelligibility inside the building.
The Effect of Direct Field Component on a Statistical Energy Analysis (SEA) Model
Authors: Putra Azma , Munawir Al , Mohamad W.M.F.W. , Mohammad J.I.
Published: December 2013

Statistical Energy Analysis (SEA) is a well-known method to analyze the flow of acoustic and vibration energy in a complex structure. The structure is divided into subsystems where the energy in each of the subsystem is assumed to be reverberant. This study investigates the application of SEA model in a 'damped' acoustic space where the direct field component from the sound source dominates the total sound field rather than a diffuse field in a reverberant space which the SEA model assumption is based on. A measurement was conducted in a scaled room divided into two acoustic spaces separated by a partition with an opening. Absorbent materials were installed on the room walls and the power injection technique was implemented to obtain the coupling loss factor (CLF) of the system. It is found that correction of the direct field component from the subsystem energy improves the prediction of the CLF of the system.
Fatigue Crack Growth Analysis of Semielliptical Surface Crack
Authors: Akramin M.R.M. , Ariffin Ahmad Kamal , Kikuchi Masanori , Abdullah S. , Nik Abdullah N.
Published: December 2013

The aim of this paper is to present the simulation technique and experimental work for surface crack in a structure. For the sake of test apparatuss feasibility, a semielliptical surface crack in a structure was converted into small specimen size. The specimens represented semielliptical surface crack problem in real application of engineering structure. The specimens with semielliptical surface crack were tested by experiment and simulation. The S-version Finite Element Model (S-FEM) was implemented in simulation, and verification was performed through experimental works. The S-FEM consists of virtual crack closure method and Paris law as a crack growth criterion for 3-dimensional problem with hexahedron elements was used. Auto-mesh generation technique with a fully automatic crack growth simulation system was employed in S-FEM simulation. Specimens with 0oof crack surface angle were prepared and analysed for the modeIloading. A four-point bending fatigue test was conducted and simulated in order to gain crack path, fatigue crack growth and stress intensity factors value. Results from simulation and experiment showed good agreement with a certain condition. The implications from the results were discussed through the analysis of fatigue crack growth.
Probabilistic Model of Surface Crack on the Lumbar Vertebra
Authors: Zulkifli A. , Ariffin Ahmad K. , Akramin M.R.M.
Published: December 2013

The objectives of this study are to determine the stress intensity factor (SIF) for different surface crack size of the lumbar vertebra and the probability of failure associated with finite element method. In this work, all the model components were meshed using the tetrahedral solid element. In order to simplify the model, all the spinal components were modeled as an isotropic and elastic material. Monte Carlo Simulation (MCS) technique was performed to conduct the probabilistic analysis using a probabilistic module in ANSYS with attempt for 100 trials. The results are observed that the maximum SIF were found in the end of crack path with 0.53 MPa.m1/2 and the corresponding probability of failure for the model is 1.22%. Sensitivity analysis had been revealed that the crack size was sensitive to the maximum stress and maximum SIF output parameters with correlation 0.989 and 0.811 respectively. The current probabilistic study is useful as a tool to understand the inherent uncertainties and variations in biological models.
Tyre Cavity Coupling Resonance and Countermeasures
Authors: Mohamed Zamri , Egab Laith , Wang Xu
Published: December 2013

This paper aims to investigate the coupling resonance conditions of the tyre, cavity and rim with the attachment of trim layers on the inner surface of tyre to mitigate the resonance effect. In order to validate the mathematical formulation, finite element analysis and experimental modal testing were performed to determine the frequency response function (FRF) for a tyre-wheel assembly with and without the trim layers as well as for separated tyre and rim. It was found that the resonance magnitude has been reduced when the trim layers were added. Couplings of cavity resonance to the tyre and rim were plausible due to the proximity of their resonance frequencies. Trim materials were tested using an impedance tube to suggest the best sound absorbing materials that can be used to mitigate the tyre cavity resonance effect.
Effect of Nitriding Cold Roled and Shot Peening on Automotive Component Fatigue Life
Authors: Kadhim Nawar A. , Nik Abdullah N. , Abdullah S. , Arrifin A.K.
Published: December 2013

The finite element modeling and analysis have been performed to investigate the effects of nitriding, cold rolled and shot peening on fatigue life of an automotive lower suspension arm component which fabricated of SAE1045 steel. The finite element analysis (FEA) results indicate a great effect for all surface finish parameters on fatigue life. It shows that nitriding increased the fatigue life of the component better than shot peening, while cold rolled effect was between them. In a nut shell, nitriding can be considered as the best surface treatment to improve the fatigue life of the automotive lower suspension arm which fabricated of SAE1045 steel.
Life Prediction of SAE 1045 Carbon Steel Using the Acoustic Emission Parameter
Authors: Mohammad M. , Abdullah Shahrum , Jamaludin Nordin , Innayatullah O.
Published: December 2013

The competency of acoustic emission (AE) technique in order to predict the fatigue life of SAE 1045 carbon steel was discussed in this paper. The correlation of the AE parameter and the number of cycles to failure of the tested specimens were established via the statistical approach. In this paper, The AE hits were selected as the functional parameter. The fatigue life values were calculated using the strain-life approach of three models; Coffin-Manson, Smith-Watson Topper and Morrow. Both AE and strain signals used in the analysis were captured using the AE sensor and strain gauge that were attached to the specimen during the fatigue test. The results show that the AE technique has a good potential in assessing the fatigue life with the designed H-N curve (AE hits-number of cycles to failure curve).
Optimization of Resonator Design for Vibration-Based Electromagnetic Energy Harvester
Authors: Seong Tony Ow Koon , Salleh Hanim , Nurashikin Anis
Published: December 2013

This paper presents an optimization on the resonator, which is one of the main components of electromagnetic energy harvester, using static structural analysis, stress analysis and modal analysis. The electromagnetic energy harvester is a vibration-based energy harvesting technology which has emerged as a solution for powering autonomous sensor nodes to increase their life span. Electromagnetic energy harvester acts as a transducer that converts ambient vibration energy to electrical power. An initial design of the resonator is developed and analyzed using ANSYS software. Static structural analysis and stress analysis have been performed to analyze different resonator designs to produce an optimum resonator model. Maximum static deflection under gravitation force was found to be 104.12 μm. Resonance frequency of the resonator was found to be 261.56Hz by using modal analyses. The selected resonator design was further modified to cater for wide-band frequency application as well as to have better performance. Four resonators with different beam lengths were combined in a model in order to operate at a wider frequency range. Five models were generated and the smallest frequency range is from 272 Hz to 299 Hz by model 5110_5410. The maximum power and minimum power that can be generated for this model is 135 μW and 93.9 μW respectively. The model 3910_4210 which has the highest frequency range generated a maximum power of 437 μW and minimum power of 270 μW at a frequency range of 422 Hz to 466 Hz.
Car Cabin Interior Noise Classification Using Temporal Composite Features and Probabilistic Neural Network Model
Authors: Paulraj Paulraj , Melvin Allan Andrew , Sazali Yaacob
Published: December 2013

Determination of vehicle comfort is important because continuous exposure to the noise and vibration leads to health problems for the driver and passengers. In this paper, a vehicle comfort level classification system has been proposed to detect the comfort level in cars using artificial neural network. A database consisting of sound samples obtained from 30 local cars is used. In the stationary condition, the sound pressure level is measured at 1300 RPM, 2000 RPM and 3000 RPM. In the moving condition, the sound is recorded while the car is moving at 30 km/h up to 110 km/h. Subjective test is conducted to find the Jurys evaluation for the specific sound sample. The correlation between the subjective and the objective evaluation is also tested. The relationship between the subjective results and the sound metrics is modelled using Probabilistic Neural Network. It is found from the research that the Temporal Composite Feature gives better classification accuracy for both stationary and moving condition model, 89.51% and 85.61% respectively.
INOD: A Graph-Based Outlier Detection Algorithm
Authors: Yang Li Hua , Li Gui Lin , Zhou Shao Bin , Liao Ming Hong
Published: December 2013

The outlier detection is to select uncommon data from a data set, which can significantly improve the quality of results for the data mining algorithms. A typical feature of the outliers is that they are always far away from a majority of data in the data set. In this paper, we present a graph-based outlier detection algorithm named INOD, which makes use of this feature of the outlier. The DistMean-neighborhood is used to calculate the cumulative in-degree for each data. The data, whose cumulative in-degree is smaller than a threshold, is judged as an outlier candidate. A KNN-based selection algorithm is used to determine the final outlier. Experimental results show that the INOD algorithm can improve the precision 80% higher and decrease the error rate 75% lower than the classical LOF algorithm.
Generation and Identification for F-Recursive Genetic Information
Authors: Li Yu Ying , Zhang Huan Li , Zhang Shi Liang , Chen Wei Rong
Published: December 2013

The P-sets consists of an internal P-set and an outer P-set . It has dynamic characteristics. In order to obtain a new method of generation and identification information, the paper proposes the concepts of-recursive genetic information and-recursive genetic degree by using the dynamic characteristic of the internal P-set. Also the structure and characteristics about-recursive genetic information are given, including the the identification theorems and the identification criterions for the-recursive genetic information. Finally, the application example of the-recursive genetic information is provided. The structure of the-recursive genetic information is a new mathematical tool to process informaiton that has inward contraction characteristic.
Solution Classification for Perspective-Three-Point Problem Base on PST Method
Authors: Li Ming Liang , Tang Jian Liang
Published: December 2013

The perspective-n-point (PnP) problem is originated from camera calibration. It is to determine the position and orientation of the camera with respect to a scene object from n correspondent points. And a new stable algorithm by using a geometric constraint called perspective similar triangle (PST) can give new equations to solve P3P. The PST method achieves high stability in the permutation problem and in presence of image noise. Using the complete discrimination system, we obtain the solution classification of the new equation for the P3P problem. The solution classification gives a set of formulas to determine the number of real solutions to the P3P problem. Based on the formulas, we may know whether the parameters give multiple solutions or not and are critical or not which is very important to present robust algorithm.
On the Monomial Bπ-Character of a Finite π-Separable Group
Authors: Liu Qin Tao , Hai Jin Ke
Published: December 2013

Let π be a set of primes. Isaacs established the π-theory of characters, which generalizes the theory of Brauer module characters. Based on Isaacss work, we introduce the definition of Mπ-groups, and prove that if G=NwrCp is an Mπ-group, where Cp is a cyclic group of order p and pπ, then N is an Mπ-group.
Content-Enhanced Matrix Factorization for Recommender Systems
Authors: Chang Hui Yuan , Li Ding Xia , Liu Qi Dong , Hu Rong Jing , Zhang Rui Sheng
Published: December 2013

Recommender systems are widely employed in many fields to recommend products, services and information to potential customers. As the most successful approach to recommender systems, collaborative filtering (CF) predicts user preferences in item selection based on the known user ratings of items. It can be divided into two main braches - the neighbourhood approach (NB) and latent factor models. Some of the most successful realizations of latent factor models are based on matrix factorization (MF). Accuracy is one of the most important measurement criteria for recommender systems. In this paper, to improve accuracy, we propose an improved MF model. In this model, we not only consider the latent factors describing the user and item, but also incorporate content information directly into MF.Experiments are performed on the Movielens dataset to compare the present approach with the other method. The experiment results indicate that the proposed approach can remarkably improve the recommendation quality.
Innovative Concepts for Newborn Pain Based Systems with Hu Moment and Similar Classifier
Authors: Mansor Muhammad Naufal , Rejab Mohd Nazri
Published: December 2013

Image analysis of infant pain has been proven to be an excellent tool in the area of automatic detection of pathological status of an infant. This paper investigates the application of parameter weighting for invariant moments to provide the robust representation of infant pain images. Two classes of infant images were considered such as normal images, and babies in pain. A Similar Classifier is suggested to classify the infant images into normal and pathological images. Similar Classifier is trained with different spread factor or smoothing parameter to obtain better classification accuracy. The experimental results demonstrate that the suggested features and classification algorithms give very promising classification accuracy of above 89.54% and it expounds that the suggested method can be used to help medical professionals for diagnosing pathological status of an infant from face images.
Neural Network Performance Comparison in Infant Pain Expression Classifications
Authors: Mansor Muhammad Naufal , Rejab Mohd Nazri
Published: December 2013

Infant pain is a non-stationary made by infants in response to certain situations. This infant facial expression can be used to identify physical or psychology status of infant. The aim of this work is to compare the performance of features in infant pain classification. Fast Fourier Transform (FFT), and Singular value Decomposition (SVD) features are computed at different classifier. Two different case studies such as normal and pain are performed. Two different types of radial basis artificial neural networks namely, Probabilistic Neural Network (PNN) and General Regression Neural Network (GRNN) are used to classify the infant pain. The results emphasized that the proposed features and classification algorithms can be used to aid the medical professionals for diagnosing pathological status of infant pain.
Research on the Construction of System Structure in University Cell Phone Library
Authors: Duan Xue Xiang
Published: December 2013

Cell phone library is a new service system in digital library. Based on wireless network and multimedia technology, readers of cell phone library can access services and resources conveniently and flexibly without any limitation on time and space. Service pattern of cell phone library mainly has SMS service mode and WAP service mode. This paper discusses the architecture model of cell phone library, which includes information system architecture, technical architecture and service architecture. The architecture model has the characteristics of highly openness, flexibility and scalability etc.
Research on Application of Modern Logistics in the Internet of Things
Authors: Zhang Ying
Published: December 2013

Compared the difference and relation between the supply chain and logistics, the paper introduced the key technologies of the Internet of things technology such as RFID, wireless sensor network, intelligent robot and focused on the application of them in modern logistics.
On the Design and Development of Management Information System of Adult Teaching Affairs in College
Authors: Wen Quan
Published: December 2013

Management information system of adult teaching affairs in college has been designed and developed to address the problem that management information system of adult higher education hasnt been fully standardized and informationized. The system has created powerful functions and practicability after detailed design and development of all management processes covering platform construction of correspondence departments, student enrolling and graduation as well as distance education the learning mode in the foreseeable future. Although the system is designed and developed for first-class management mode of adult education, it still has a strong reference to other management modes.
A Novel Constraint Specification of Weakly Hard Real-Time System Based on Fixed Sliding Window
Authors: Zhu Xu Dong , Chang Hui You
Published: December 2013

This paper puts forward a novel constraint specification. By limitations on the maximum of consecutive miss of deadline and the minimum probability of meeting deadline on the fixed sliding window s×m, the novel constraint specification has three contributions to the research of the weakly hard real-time system constraint specification. Firstly, has configurable flexible parameters which can easily realize all hard real-time, soft real-time and weakly hard real-time only by changing the parameters. Secondly, replacing the "fixed sliding window" with the "any" window, the novel constraint specification not only simplify the calculation of real-time, which will reduce the time consume, but also broaden the application scope such as smoothly scheduling. Moreover, the fixed sliding window is helpful to find a schedulable μ-pattern. Thirdly, the novel constraint specification solves the invalidity of some constraint specification when the first invocation of task is lost or missed. Through analysis and experiments, the results demonstrate that our novel constraint specification outperform previous approaches in both calculation methods and application scopes.
Parallel Integration Using OpenMP and GPU to Solve Engineering Problems
Authors: Smirnov Vladimir
Published: December 2013

The paper presents the results of a comparative analysis of parallel integration methods to solve engineering problems. We examine a problem of velocity and displacement data reconstruction from measured acceleration signal. Many engineering tasks such as vibration data acquisition from underground traffic, dwellings vibrations due to wind pressure, earthquake data acquisition, etc. involve field measurements that are mostly performed using accelerometers. For engineering analysis purposes these records are to be integrated to get velocity and displacement. Since some of the measurements are quite long, moreover number of acquisition channels often exceeds dozen, we get a large amount of data to be analyzed fast. The best solution for the problem is parallelization of the integration algorithm, which involves using some modern techniques like OpenMP or GPU computing. This article shows the performance acceleration on different processors for OpenMP technology as well as performance acceleration for different GPU supported devices. Some aspects of algorithm implementations are discussed and future work suggested.
Remote Testing of the UHF Radiation Field Generated by Corona Discharge of the Transmission Lines
Authors: Fan Gao Hui , Wei Ming , Hu Xiao Feng
Published: December 2013

The UHF radiation field generated by corona discharge of the two 500kV AC transmission lines was tested. The influencing factors of radiation field, including climate, bundle conductors number and test distance, were analyzed. Test results indicate that the field continuously arranges from 200MHz to 700MHz, mainly from 200MHz to 500MHz. The maximal measurement distance is 300 meters. The climate and bundled conductors number affect the radiation field obviously. The discharge will become intense when the temperature and humidity increase and bundle conductors number decays. The peak values of the electric field strength which decay rapidly with the distance increasing, can arrive several hundreds uV/m. The test results rich the UHF radiation field data and offer references to testing and evaluating the electromagnetic interference generated by corona discharge of ultra-high voltage transmission lines.
Future Internet Trends Research
Authors: Bao Si Yun , Wu Heng Kui
Published: December 2013

With the development of Internet scale, diversifications of applications and the network virtualization, novel applications emerge, such as search services, stream, social networks, cloud services, e-commerce, big data services and so on. Current Internet cannot afford the diversifying services any more. The network architecture should be improved or a clean slate architecture design is desired. Novel designs of future Internet become a hot topic. IPv6 is the improvement version of IPv4, which solves the address issue of the current Internet, but issues of routing scalability, security, mobility and Quality of Service are still remain. There are two ways to future Internet, improving ones and clean slate designs. The former is based on the current Internet and the latter is novel design without the limitation of the current network architecture. In this paper, we introduce related work of future Internet and summarize the locator/ID separation mechanism, SDN, OpenFlow, NDN and so on. At final, we conclude the paper.