bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Peripheral Sound Visualization Using the Improved Ripple Mode
Authors: Xu Bin , Yang Dan , Zhang Yun Yi , Wang Xu
Published: January 2012

In this paper, we proposed a peripheral sound visualization method based on improved ripple mode for the deaf. In proposed mode, we designed the processes of transforming sound intensity and exterminating the locations of sound sources. We used power spectrum function to determine the sound intensity. ARTI neural network was subtly applied to identify which kind of the real-time input sound signals and to display the locations of the sound sources. We present the software that aids the development of peripheral displays and four sample peripheral displays are used to demonstrate our toolkit’s capabilities. The results show that the proposed ripple mode correctly showed the information of combination of the sound intensity and location of the sound source and ART1 neural network made accurate identifications for input audio signals. Moreover, we found that participants in the research were more likely to achieve more information of locations of sound sources.
Signal Denoise Method Based on the Higher Order Cumulant and Local Tangent Space Mean Reconstruction
Authors: Wang Guang Bin , Li Xue Jun , Wang Ke
Published: January 2012

In signal denoise method to nonlinear time series based on principle manifold learning, reduction target dimension is chosen at random, which cause low efficiency. Local low dimensional manifold is obtained by the eigenvalue decomposition to the covariance matrix, but covariance belongs to the second order statistics and cannot reflect the nonlinear essential structure of signal, these reduce denoise efficiency and effect. In order to solve these problem, a new denoise algorithm based on the higher order cumulant and local tangent space mean reconstruction is proposed in this reserch. First, the signal's intrinsic dimension is obtained as dimension of reduction targets by maximum likelihood estimation. And then making use of restraining character to colored noise of high order cumulan,covariance matrix is constructed by high order cumulant function instead of second order moment function. The data outside intrinsic dimension space will be regarded as noise signal to be eliminated. Finanly the process of global array by affine transformation will be replaced by mean reconstruction,the data after denoise may be obtained in the inverse process of the phase space reconstruction. The effectiveness of the algorithm is verified through the denoise experiment in fan vibration signal with noise.
Heart Sound Analysis for Discrimination of VSD
Authors: Sun Shu Ping , Jiang Zhong Wei , Wang Hai Bin , Tao Ting
Published: January 2012

A ventricular septal defect (VSD) is the most common congenital heart disease, which can be cured with a high probability if it is detected in an early stage. In our previous researches on heart sounds (HSs) analysis, the detection methods of heart disease using the cardiac sound characteristic waveforms in time domain or in frequency domain were proposed, and have been succeed in discriminating several heart murmurs. In this paper, we are going to apply these methods to detect VSD. Based on analysis results, a new approach by using the feature parameters both in time domain and in frequency domain is proposed to achieve higher discrimination rates.
Research on SVPWM Method and its Neutral Point Potential Control
Authors: Liu Yan , Wang Xu , Xing Yan
Published: January 2012

Neutral-point potential unbalance is an inherent problem of Neutral-point-clamped three-level PWM rectifiers. If the problem of neutral point can’t be controlled appropriately, the harm of input current will increase, and even the dc-link capacitor and switches will be destroyed. Thus domestic and foreign experts have done lots of research on the balance control of Neutral-point-clamed and put forward many effective control methods. This paper proposes a novel SVPWM strategy for the three-level neutral-point-clamped voltage source inverter, based on the particular disposition of all the redundant voltage vectors. The new modulation approach shows superior performance for the harmonic voltage and the control of neutral-point potential compared to the popular eight-stage centered SVPWM and realizes the balancing control of inverter neutral-point potential by modifying redundant small vectors pairs’ distribution factor accurately, only requiring the information of dc-link capacitor voltages and three-phase load currents, which is convenient to apply and is compatible of digital computer realization. The feasibility of the proposed control approach has been verified via simulation and experiment results. In the strategy of software control, domestic and foreign scholars propose numerous neutral point potential control schemes. When carrier modulation is used, the balance control is achieved by injecting zero-sequence component into the three-phase modulated wave. When space vector modulation methods are adopted, they can be divided into three categories: passive control, hysteresis control and active control. there is also a new algorithm based on the intrinsic relationship between SVPWMs for two—level inverters and three．1evel inverters．a novel SVPWM control algorithm is proposed for three．1evel．The dwell time of voltage vector for three-level inverter can be acquired from counterpart for two-level inverter by using a linear transformation．Aiming to analysis the output PWM sequence of three-level inverter, a novel classification standard of voltage vector is proposed．Based on evaluating the PWM sequences, a novel PWM sequence is given，that can reduce the total harmonics distortion of inverter output.
Development of an Autonomous Two-Wheeled Vehicle Robot
Authors: Sasaki Minoru , Tanaka Hidenobu , Ito Satoshi
Published: January 2012

This paper describes a development of an autonomous two-wheeled vehicle robot. The model of the two-wheeled vehicle using steering control is derived. The control systems are designed by linear quadratic regulator and linear quadratic integral method. Stabilization is achieved by measuring roll angle and roll rate and controlling the steering torque. The experimental results and simulation results show stable running control of the two-wheeled vehicle robot and coincident with each other. The approach is validated through these results.
System Development of an Experimental Rocket and an Autonomous Free Falling Mobile Robot
Authors: Mori Yuito , Ogushi Naoki , Nishimura Tokunari , Sasaki Minoru
Published: January 2012

This paper presents the development of a small experimental rocket for the National Launching Campaign held by the DGAEM in France since 2009. The campaign organized by CNES was conducted by the French Association of Planete Sciences. The rocket design was developed by Space Club Gifu and Sasaki Lab at Gifu University. The main mission is the autonomous navigation of a quasi-satellite maneuvering with a parachute and two propellers to a target point using GPS data. The rocket is 2m long, 150mm in diameter, weight 11.4kg and made entirely of CFRP. With a solid rocket motor provided by CNES, the rocket can reach an altitude of 840m. Onboard are a pressure sensor, accelerometer, GPS and two video cameras. The video cameras begin monitoring at launch. The acceleration, velocity and position were recorded for later comparison to simulation data. While the rocket launch and quasi-satellite deployment were successful, strong winds prevented the latter from maneuvering to the target point. All components were recovered intact and all recorded data were available for analysis.
Bipedal Walking Trajectory Generation Using Tchebychev Method
Authors: Kim Yeoun Jae , Lee Joon Yong , Lee Ju Jang
Published: January 2012

It is still important and difficult for a biped robot to optimally generate the stable walking trajectory, because the mechanical limitations of the given biped robot should be also considered carefully. In this paper, we assume that different walking trajectories enable to be generated according to various set of weights of torques loaded in each partial joint (e.g., ankle, knee, and hip joint). We present a method for generating various bipedal walking trajectories corresponding to a set of weighted torques. For this purpose, Tchebychev method and sequential quadratic programming are employed to optimize single cost functions consisting in a set of weight torques. Some notations and constraints introduced in [1] are used and modified in this paper.
Design of Vibrating Signal Acquisition and Processing System Based on Wireless Transducer Network
Authors: Gao Jian Chao , Guo Hai Bao , Hao Li Na , Li Yun Gong
Published: January 2012

This research aims at the problem in the vibration signal monitoring area that few of systems based on wireless sensing technology are developed to deal with the problem of vibration specially. The paper presents a system based on wireless acceleration transducer network, which integrated the function of vibrating signal acquisition and processing. The system is tested in vibration bench. The operation of the system is simple and intuitive. Researchers could achieve the operation of collecting and analyzing signal, setting the parameter of the sensor nodes and monitoring the state of the network. The presented system provides users friendly interface to make it easy to do some researches about vibration signal acquisition, processing and analysis. Additionally, the system provides some program interfaces, with which users can easily do secondary development work and perfect the system.
Design of the AC Motor Speed Regulator Controlled by ARM
Authors: Huang Jing Long , Peng Zhong Zhong , Qing Pan
Published: January 2012

The paper proposes an AC motor speed regulate system based on ARM. The system's hardware core is the LPC2131, in which processor successfully transplanted the μC/OS-II real-time operating system. In the form of task, each functional module of the system can be achieved on the processor LPC2131.The system is simple hardware circuit, software module to realize the complex control algorithms. Experiments show that the multi-task classify program is feasible on the embedded real-time operating system based on LPC2131 and μC / OS-II, it ensures the system's real-time, has good multi-task operating and transferring characteristics and improves the system stability and reliability.
Inverter Control System of Alternating Current Motors Based on ARM and μC/OS-II
Authors: He Kuan Fang , Li Xue Jun , Wu Ji Gang , Huang Jing Long
Published: January 2012

This paper aims to design the inverter control system of alternating current (AC) motors based on Advanced RISC Machines (ARM) and μC/OS-II. The system's hardware core is the LPC2131 in which processor successfully transplanted the μC/OS-II real-time operating system. In the form of task, each functional module of the system is achieved on the processor LPC2131. Testing and experiments show that the multi-task classify program is feasible on the embedded real-time operating system based on LPC2131 and μC/OS-II, it ensures the system's real-time, has good multi-task operating and transferring characteristics and improves the system stability and reliability.
The Design of Combined DCU (Data Concentration Unit) System with Power-Line Communication and DOCSIS Cable Modem for AMR (Auto Meter Reading)
Authors: Jeong Su Mi , Seo Chung Ki , Kim Sang Jin
Published: January 2012

The AMR (Auto Meter Reading) is needs to prepare separate IPs and communication lines for remote communication because DCU (Data Concentration Unit) and wideband modem are identical system required the resource to communication. It is the purpose of the literature to improve system stability and data reliability by means of integrating broadband cable communication part and PLC communication part within DCU. A PLC has some draw-backs in wideband communication because of absences of international standard specifications and the characteristic of power line. We integrated broadband cable modem and PLC modem in DCU. Therefore, the communication system is designed with unified board. PLC modem and broadband cable modem are designed to meet ISO/IEC12139-1 and international specified DOCSIS2.0 standard, respectively.
Design and Implementation of Vehicle Pedestrian Detection System Based on FPGA
Authors: Ma Xue Wen , Ma Shuang , Li Meng Yao , Jin Mei Ling
Published: January 2012

The vehicle pedestrian detection system is a kind of solution to car driver assistance. The system can detect pedestrian in dangerous and send early warning to drivers automatically. Therefore, it has practical significance to develop a robust、real-time and stability pedestrian detection system which can reduce and avoid pedestrian accidents effectively. This article completes the vehicle pedestrian detection system based on FPGA. It used the cyclone II EP2C70 DSP development board provided by the Altera Corporation. By testing, the system can determine a size of 320 × 240 grayscale image takes about 723ms at the clock frequency in the 100MHZ. It achieves the desired functionality. The system has better real-time and reliability. At the same time, it has small size, easy to control and the most important is that it has broad application prospects.
Path Following Control for a Class of Electro-Mechanical Systems and its Application
Authors: Taniguchi Mitsuru , Fujimoto Kenji
Published: January 2012

This paper is devoted to path following control for electro-mechanical systems described by the port-Hamiltonian form. Path following control is investigated mainly for mechanical systems since the desired path is characterized by its ‘position’. Therefore, most of the existing results use the nature of second order differential equations since mechanical systems are described by them. The present paper proposes a new path following controller for 3rd order differential equations described by the port-Hamiltonian form. This is done by generalizing the authors’ former result on passive velocity field control for mechanical systems.
MSC ADAMS Based Simulation of a Test-Bed for Cell Injecting Using IPMC
Authors: Hao Li Na , Liu Hong Tao , Gao Jian Chao , Zhang Peng
Published: January 2012

The research is aimed at finishing the dynamic simulation of test-bed for cell injecting using IPMC (Ionic Polymer Metal Composites) based on MSC ADAMS. By changing experiment data of the simulation in ADAMS, researchers choose optimization data as the initial parameters of test-bed for cell injecting. A multi-rigid-body system dynamics model of the test-bed for cell injecting is established through analyzing the system dynamic parameters and applying a mechanical dynamic analysis software ADAMS. The optimal PID parameters of microscope’s focusing system are confirmed. Thus relevant actuating motor can control microscope’s lens rapidly and exactly by these parameters. The realization of ordinal simulation provides accurate recognition of experiment system’s initial position and running time. This research finishes dynamic simulation and analysis of a test-bed for cell injecting using ADAMS software. Optimal parameters are chosen for the control system according to simulation and analysis. The theoretical analysis and experimental results can be widely referred by the multi-rigid-body physical prototype manufacture.
A Stenciling Delay System for Steel Plate Ultrasonic Flaw Detection Process
Authors: Wang Geng Zhu
Published: January 2012

In the process of steel plate ultrasonic flaw detection, once the instrumentation discovers the flaw, a sign is stenciled in the vertical direction of the flaw, because there is a distance between the detector and stenciling, an effective method must be applied to reasonably control the stenciling, in order to achieve the precise stenciling. Based on characteristics of the steel plate flaw detection process, the delay distance between each group of detectors and stenciling has been analyzed, simultaneously based on the flaw detection speed, stenciling delay data has obtained. Stenciling delay structure is developed using the computer software technique, instead of hardware control mode, software algorithm is carried out to design, which has achieved the goal of convenience application and precise orientation.
Welding Seam Turbulent Tracking Technique for Spiral Welded Pipe Ultrasonic Flaw Detection
Authors: Zhang Wen Jie
Published: January 2012

In the process of spiral submerged-arc welding automatic flaw detection, the weld edge reflection echo is very close to the back edge of the detection gate (generally around 3Ls, is equal to steel transversal wave approximately 4.5mm); therefore once the detector approaches the welding seam, the edge refection echo will enter in the gate, which causes the false alarming. In the past, the mechanical cam tracking, approaching switches tracking and photograph tracking methods were applied, but the mechanical cam tracking and the approaching switches tracking method have low precision, the result is not good. Although photograph tracking method has high measure precision, because of the light scattering of the water flow on the surface of the steel pipe, which will affect the precision. Both photograph tracking and stepping motor-driven methods is commonly used national wide, the effect is not good. Base on the above situation, the electromagnetic welding seam tracking and servo control electromechanical system with functions of electromagnetic tracking and servo control is developed.
Vibration Control and Dynamical Model of a Thermal-Electrical-Mechanical Coupled Smart Cantilevered Beam
Authors: Zhang Ting , Li H.G. , Zhao J.J.
Published: January 2012

Piezoelectric actuators used in vibration control and high precision control have been known widely in recent years. Especially in aeronautics and MEMS systems, their use is spread from vibration suppression to position control. In this paper, a finite element model (FEM) of a piezoelectric actuator and cantilever in thermal environment is presented to suppress vibration effectively. In other words, the finite element model is namely thermal-electrical-mechanical coupled FEM. Based on a 8-node plane finite element, the modal analysis, the harmonic analysis and the transient analysis have been obtained in the current work. Therefore a transfer function model will be attained through the harmonic analysis by identification method in order to control vibration by control law. In addition, the controller will be designed with the adaptive pole placement control (APPC). Finally, through simulation, the thermal influence is considerable for natural frequencies, harmonic response and free vibration. Moreover, the APPC is a significant plan to vibration control in the paper.
The Optical Network Design Using Availability Models to Accept Additional Nodes
Authors: Eun Jong Boo , Park Gyou Tae , Ahn Gwang Hoon , Kim Hie Sik
Published: January 2012

It is so obvious that we have to consider factors of costs, the QoS (Quality of Service), and performance analysis for the design of an optical network. The models of Traffic and availability are significant factors for achieving the performance analysis from the initial step to deploying network. But current traffic models are solely used by a single segment. Whole networks are extended from a sing traffic model. On the other hand an availability model is just used to find the rate of hardware failures. In this paper, we implemented an availability model with regional conformance by inversely analyzing the definition of availability. Also, we computed the number of nodes and links to configure the logical topology of optical networks by using our designed availability. Furthermore, we proposed a method to design an optical network by using our novel availability model.
Design and Simulation of PEM Control System for Reactive Sputtering Coating
Authors: Huang Ying , Zhao Jin Yan , Chen Cai Hong , Zhang Yi Chen
Published: January 2012

During the reactive sputtering process, due to the hysteresis effect, the sputtering state should be maintained in the transition region of the hysteresis curve which can used to obtain stoichiometric compound films at a high deposition rate. If sputtering state changes, it is impossible to make the sputtering state step back to the original point by manually control the process parameters, because the hysteresis is irreversible. Thus it requires a method of fast feedback to control the sputtering power and the reaction gas flow rate into the chamber. In this paper the PEM (plasma emission monitor) control system and the single neuron self-adaptive PID algorithm have been designed to maintain the sputtering state in proper condition, namely preventing the target from poisoned in the reactive sputtering. The signal acquisition and the controller design were the major parts of the PEM system. The signal acquisition was realized by the optical emission spectrometer. And the single neuron self-adaptive PID controller has been designed in the paper. Using the MATLAB software, the simulation experiments have been done. The output waveforms showed that using traditional non-adaptive PID control algorithm, the overshoot is over 6% and the regulation time is over 1.8s, but using single neuron self-adaptive PID algorithm the overshoot 0 and regulation time 0.5s. Monitoring the target spectral intensity at various reaction gas flow rate, several conclusions could be obtained. The overshoot 6% indicated that the reactive gas flow into the chamber was excessive, the target was poisoned and the sputtering state in chemical mode. And while the overshoot was zero which indicated that the target poisoned was avoided and the reaction ran in defined condition. The PEM using the single neuron self-adaptive PID algorithm responded faster than that using the traditional PID algorithm. The PEM system designed in the paper can effectively avoid the target poisoned and make the reactive sputtering maintain at an ideal state.
A Game Theory Based Approach for Routing in Wireless Sensor Networks
Authors: Li Feng Yun , Gao Fu Xiang , Yao Lan , Chang Gui Ran
Published: January 2012

Aiming at the limited resources and the security issues in wireless sensor networks, a routing approach is proposed. In this approach, the factors of reputation, remaining energy, and the distance to the destination are taken into considered while searching a routing path from an original sender node to the destination. A reputation-based mechanism is also proposed, and a node’s reputation depends on its behaviors. The malicious behaviors nodes will be punished and isolated, and the cooperative ones will be rewarded. Simulation results show that our proposed routing scheme can prolong the lifetime of the network and can offers a relatively high throughput than other routing protocols even when there are malicious nodes in the networks.
Identification of Damping Ratio for a Rotor-Bearing System Using a Magnetic Bearing Exciter
Authors: Zhu Yong Jiang , Zhang Ya , Wang Wei Min , Yao Jian Fei
Published: January 2012

A magnetic bearing exciter is attached to the rotor-bearing system, to exert an asynchronously rotating force on the rotor to excite the first forward mode. And the half-power point method is developed on the basis of displacement response function, where displacement response data is needed only to identify the frequency and damping. The simulation results show that the method can effectively identify the damping with speed and white noise interference. The experiment results show that the damping radio decreases with increasing rotational speed. It has a good engineering application prospects.
Gas Turbine Condition Monitoring and Prognosis: A Review
Authors: Wang Sha Sha , Wang Wei Min , Shi Yong Qiang , Zhang Ya
Published: January 2012

Gas-turbine engines are critical to the operation of most industrial plants, aircraft and heavy vehicles. Condition monitoring is essential to mastering mechanical system running status, improving operation reliability, and reducing maintenance cost. This paper reviews state-of-the-art gas turbine condition monitoring, puts forward the pending problems and predicts future development in the field. Three main advanced methods are introduced briefly in the end.
Effects of Shroud Curvature on the Performance of Centrifugal Compressor Blade
Authors: Hao Kai Yuan , Wang Wei Min , Shi Yong Qiang , Wang Sha Sha
Published: January 2012

The purpose of the study described in this paper was to investigate the impact of shroud curvature on the performance of a centrifugal impeller or stage. The paper discusses a computational fluid dynamics (CFD) study done to assess the influence of shroud curvature on impeller performance. The computational fluid dynamics (CFD) and finite element analyses (FEA) methods were used to describe the various designs of the impeller. Aerodynamic and mechanical analysis results are presented for four impellers of varying cover curvature and axial length. The aerodynamic results showed there were clear aerodynamic benefits to decreasing the curvature along the impeller shroud. The mechanical analytical results showed that the impeller with the lowest curvature or longest axial length provided the highest performance; it also yielded the lowest Von Mises stress level. In closing, there are clear aerodynamic benefits to decreasing the curvature along the impeller shroud but these benefits must be weighed against the impact on the rotordynamic considerations Comments are offered regarding the rotordynamic issues that must be considered when increasing the length of impellers.
Model-Based Fault Diagnosis Approach for Rotor System with Unidentified Supporting Parameters
Authors: Yao Hong Liang , Ma Hong Bin , Han Qing Kai , Wen Bang Chun
Published: January 2012

The model based diagnosis method can detect both the fault location and the fault extent of the rotating machinery at the same time as it can combine the dynamics and fault diagnosis method together. However, the modal test of the supporting part is necessary when using the existing model based method, and the precision of the modal test results make a strong impact on the diagnosis results. In order to improve this case, an improved model based diagnosis method is presented herein by combining the fixed-interface modal synthesis method with the traditional model based diagnosis method. The DOF of the unidentified parameter due to the supporting parts are partitioned to interface DOF, and the displacement information of the supporting parts can be measured by the mounted sensors. Therefore, the model based diagnosis method can be carried out by only using the parameters of the rotor without considering the effects from the supporting, which can greatly improve the diagnosis precision and efficiency. This method is fit for the rotor systems with unidentified supporting parameter, and the rotor systems with unknown nonlinear supporting parameter. Both the numerical simulation results and the experiment results in the example proved the efficiency of this method.
A Sun Tracking PV System Equipped Greenhouse Control System for Educational Purpose
Authors: Kim Kee Hwan
Published: January 2012

The greenhouse control system for educational purpose is designed by personal computer. This system should observe and control the growth conditions for crops in both plastic film and glass greenhouses. In this contribution puts emphasis on construction of greenhouse control system by personal computer under the aim of creating safer, more effective and more economical services. This system is developed for the requirements of the intelligent greenhouse control system and is powered by solar energy. A photovoltaic system with sun tracking module is used for the greenhouse control system.
Similitude Analysis on Mechanical Parameters of Thin Walled Shells
Authors: Qin Gao Ming , Duan Hai Yang , Luo Zhong , Han Qing Kai
Published: January 2012

The relationship of the kinetic fundamental parameters for both the prototype and model are derived by employing the finite method. Based on the relations, the scaling laws of the thin walled cylinder for the free vibration are found by applying the similitude transformation to the governing equation. In the absence of the experimental data, the validity of the scaling laws is testified by numerical data. This is done by calculating theoretically the natural frequencies for free vibration of the cylinders. By substituting the model frequencies in the scaling laws, the frequencies of the prototype are obtained. Consequently, the frequencies of the model and prototype are compared. Examples that one end of the thin walled shell is clamped and the other is simply supported show exact agreement.
A Vibration-Isolated Body of Chaotic Prediction
Authors: Gao Yong Yi , Zhan Shi Ping , Li Ban Gyan
Published: January 2012

The nonlinear dynamics equation of passive vibration isolator is established in this paper. According to the nonlinear vibration theory, the average equation of slow-varying primary harmonic in the condition of weak nonlinearity is abstained , and derived a discrete mapping of the harmonic slow variable parameter state equation, then get the analytical conditions of chaos in the passive vibration isolator, the analytical results show that only when the vibration frequency of the groundsill is higher than the inherent frequency of the passive vibration isolator, the chaos can be observed, when the groundsill vibrate with the large amplitude and high frequency vibration, the chaos can’t be observed in the passive vibration isolator system. Finally the analytical prediction is validated by analog simulation experiment, and gets the conclusion that the prediction matches well with the simulation results.
Epoxy-Layered Silicate and Epoxy MWCNTs Nanocomposites
Authors: Stan A. , Dinca I. , Ban C. , Ilina S. , Donescu Dan , Paven H. , Dumitrache L. , Gavrila L. , Voicu I.
Published: January 2012

The paper deals with the rheological properties of epoxy resin additivated with organically modified montmorillonites, carbon nanotubes and nanocarbon. The paper also presents the influence of nanoadditives over composites mechanical properties. The epoxy polymer is diglycidyl ether of bisphenol A (DGEBA) and the curing agent is an aliphatic tetraamine. Organically modified montmorillonites Cloisite 30B and Cloisite 93A, MWCNTs and laser synthesized nanocarbon were used to synthesize nanocomposites by dispersing each in an epoxy resin. The dispersion was achieved through mechanical and sonic methods. The epoxy resin additivated with nanosized fillers was rheologically tested to study the dispersion influence. The sonic dispersion of nanoadditives is observed to drastically influence the rheological behavior of the suspensions. Newtonian fluid behavior disappears as the additive loading increases. The work mentions the influence of nanoadditives on the manufacturing process of epoxy /glass fibre and epoxy/ carbon fibre laminated composites.
Behavior of the Composite Lightweight Concrete
Authors: Bouaziz S. , Ait Tahar Kamal
Published: January 2012

The use of the lightweight concrete in the so wide field of construction currently makes important great strides considering their threshold of mechanical performances. The use of the lightweight materials such as the hemp, the sawdust, the modified polymers increase their applications. This study which wants to be an innovation in the field them construction materials consists in proposing an new approach of realization of polypropylene grains coated to thwart the lightweight phenomenon of increase of the grains in the matrix concrete of the cylinder. This technique makes it possible in addition to ensure the homogeneity of the matrix concrete and to thus increase the mechanical resistances. This study comprises a packed experimental investigation and a mathematical modeling of the thermal phenomena. The obtained results put forward the advantages of this technique which fulfil the requirements of sustainable development.
Effect of Al2O3 Powder on Properties of Fumed Silica Thermal Insulating Composites Using Mechanofusion Technique
Authors: Han Lu , Yuan Lei , Liu Jia Zhan , Yu Jing Kun
Published: January 2012

This study describes the manufacturing process of thermal insulating composites which made from fumed silica powder, reinforcing fibre and other additives using advanced mechanofusion technique. The research focuses on the effect and mechanism of Al2O3powder on thermal insulating composites, which using as high temperature shrinkage inhibitors to restrain sintering in fumed silica compacts at high temperatures. The results show that nanosize Al2O3powder can effectively improve the volume stability of the compacts above 800°C, but which has little influence on thermal conductivity at higher temperatures. The compacts prepared in this study exhibit fracture strength of 0.26 MPa at room temperature, thermal conductivity of 0.0336 W/(m•K) at 1000°C and tiny volume shrinkage about 1.1% at 1000°C for 12h.
The Design of Well Logging Data Acquisition Based on FPGA
Authors: Li Yong Hua
Published: January 2012

A novel kind of logging data acquisition is designed based on FPGA.In this paper, the hardware and software are described in detail. Experiment results show that the designed circuit and program are reasonable and reliable by the logging signal simulator, which can meet the logging requirement of oil field.
The Application of Signal Processing Techniques in Improving Spectrometer Detection Limit
Authors: Wu Zhi Ying , Zhang Yi , Shen Zuo Yuan
Published: January 2012

Improving spectrometer detection limit using statistical principle and signal-processing technique are described simply in this work. In the detection of gas photoacoustic(PA) signal, accurate partitions of the sampled data affect on the detection limit to some extent although Lock-in amplification technique with high SNR and microphone sensor with high sensitivity have been used. A model and the resulting algorithm are proposed from PA-signal samples. The techniques are validated at ppb level on PA spectrometer for NH3 breath detection in high concentration of CO2 and H2O based on tunable erbium-doped fiber laser (TEDFL) or for multicomponent trace gas detection based on waveguide CO2 laser or on other laser source.
Effective Stress Parameter for Unsaturated Soils under Drying and Wetting Processes
Authors: Voottipruex Panich , Uchaipichat Anuchit , Man Koksung Ekachai
Published: January 2012

This paper presents a variation of effective stress parameter with matric suction for unsaturated soils using a comprehensive data set of suctioned-controlled shear tests under drying and wetting processes. The effective stress parameter is determined by assuming that the slope of the critical state line in the plane of deviator stress against mean effective stress is independent of matric suction. This study shows a different in relationship between the effective stress parameter and matric suction for drying and wetting processes. The values of effective stress parameter obtained from the experiments were compared with those obtained from the expressions proposed in literature.
Research on Parallel Scheduling of Maximize the Number of Task Processing under Time Constraints- an Example to De-Icing Operation
Authors: Li Bing , Fu Xin Yue , Su Dan , Jiang Gui Song
Published: January 2012

Under the context of airplane deicing, this paper aims to do a research on the unrelated parallel scheduling of service resources with flexible time window. To deal with more tasks, minimizing delay time is chosen to be the objective of the mathematical model and a modified ant colony algorithm is given. With full consideration of the practical problem and constraints, update policy of pheromone and settings of heuristic factors are suggested. The feasibility and rationality are proved by a simulation example. The modified ant colony algorithm outperforms FIFO method and could be well applied in the unrelated parallel scheduling issues with flexible time window.
Fuzzy Techniques in Biometric IBE without Random Oracles
Authors: Wu Qing
Published: January 2012

Using a biometric as an identity has the advantage that identities are unique if the underlying biometric is of a good quality, such as fingerprints, faces, irises. Since biometric measurements are noisy, the existing identity-based encryption systems cannot be used directly to construct IBE scheme. The error-tolerance property of Fuzzy-IBE allows for a private key to decrypt a ciphertext encrypted with a slightly different measurement of the same biometric. Based on this property, a new biometric identity based encryption scheme is proposed. Our scheme is constructed in the standard model and achieves a selective identity security. In addition, the security of our scheme is reduced to decision bilinear Diffie-Hellman(BDH) assumption instead of other strong assumptions.
The Establishment and Numerical Calculation of Thin Film Lubrication Model
Authors: Liu De Liang , Sun Ang , Cao Shu Hua
Published: January 2012

Thin film lubrication (TFL) and elasto-hydrodynamic lubrication (EHL) are different lubrication states, their lubrication mechanisms are different, but the transition from EHL to TFL is a continuous process at the aspect of film thickness change, it is important to establish a physical-numerical model that can be suited for both EHL and TFL. Based on rheological, the change of micro thickness is expressed by the change of viscosity, then the micro problem of TFL can be turn to macro problem. The adsorption layer is divided into two parts formatted by static contact and shear force in the calculation. In a given static adsorption film, other oil film parts will be comprehensive consideration, modified formula of the overall average equivalent viscosity is gained by the method of combining numerical calculation and experiment, then numerical model is established for both EHL and TFL. TFL and EHL typical characteristics and the effectiveness of the model can be obviously shown by the results.
Theoretical Analysis for Storage Reliability of Underwater Vehicle
Authors: Xie Yong , Yuan Bing Cheng , Meng Qing Yu
Published: January 2012

For those underwater vehiclees always stored in underwater vehicles-boxes which are filled in nitrogen annoys,the paper provides a formula of calculating storage reliability and relevant cases.Based on this,according to actual launching frequency of trial mission and storage time.It sets up the formulas of each underwater vehicle on launching frequency、maintenance frequency and the frequency of shore-based ohmic exercises.The results of calculation indicate that they are of high practicability and applicability,and can be applied in theoretical analysis on current storage reliability of underwater vehiclees in commission.
Research on the Braking System Control Strategy of Hybrid Electronic Bus
Authors: Liu Ji Shun , Li Jun , Zhang Yong Sheng , Chu Liang , Yao Liang
Published: January 2012

As one of the key technologies of Hybrid Electronic Bus, regenerative braking technology can recover energy without changing the traditional bus braking habit. This is of vital importance in the research of regenerative braking system. Because the braking force distribution relationship between the front and rear axle of the vehicle has a remarkable influence in the braking stability,especially adding the regenerative braking force, the influence is even larger. So the anti-lock braking control strategy for the hybrid electronic vehicle is updated in this paper according to the condition of regenerative braking. The anti-lock braking control and regenerative braking control were integrated in one ECU (Electronic Control Unit) of braking control system, collecting signals of wheel rotate speed, vehicle speed, SOC and brake pedal position by CAN bus. And the output control commands are sent to the execution unit of anti-lock braking system and regenerative braking system. The effectiveness of energy regeneration and the braking stability of this strategy are tested on the off-line simulation platform.
Application of Layered Media as Substrate in Infiltration Treatment System for Municipal Wastewater Treatment
Authors: Zheng Lei , Sun Zong Jian , Ding Ai Zhong
Published: January 2012

In this paper, a layered media was used as substrate in a infiltration treatment system for municipal wastewater treatment. The efficiency of this system on nitrogen removal was compared with that by traditional used gravel and the surface characteristics of the layered media were analyzed using SEM. The results show that the layered media used as substrate in infiltration treatment system for wastewater treatment is more efficient on nitrogen removal than gravel. In the system, artificial soil provides storage for contaminants and bio-ceramics support the living organisms. The alternative running of reactor with 12 hours’ feeding followed by 12 hours’ break may supply changing environments between oxidative and anoxic in the system which is important for nitrogen removal.
Optimization of Processing Parameters for Low VOC Emissions of Wood-Based Panels
Authors: Liu Yu , Shen Jun , Zhu Xiao Dong
Published: January 2012

The influence of hot-pressing parameters on formaldehyde and other volatile organic compounds (VOC) were studied in this paper. The particleboard of larix gmelinii and UF resin were used as main raw materials. Orthogonal design was adopted to analyze the influence of hot-pressing temperature, time, resin and density on the concentration of formaldehyde and other VOC. The results showed that the emission of formaldehyde and other VOC were significantly affected by hot-pressing temperature, time, resin and density. The emission of formaldehyde and other VOC were obviously decreased in usage with the increasing of hot-pressing temperature, press time and the decreasing of density. Taking formaldehyde and other VOC emission into account, the optimized condition was hot-pressing temperature of 180°C, press time of 5 min, resin content of 11%, board density of 0.6g/cm3. The emissions of optimized particleboard satisfied the national standard GB18580-2001.
Effect of Stirrup on Reinforcement Corrosion-Induced Cover Cracking
Authors: Li Qiang , Zhang Xiao Jian , Ding Tian Ting
Published: January 2012

Cracking of the cover concrete due to steel corrosion is considered as one of the major issues of durability of reinforced concrete (RC) structures. Numerous models have been developed to predict the time from corrosion initiation to cracking of the cover concrete. However, little work has been done on the effects of stirrup on reinforcement corrosion-induced cover cracking. In this paper, the effects of stirrup on reinforcement corrosion-induced cover cracking are investigated. The results of four short columns (section size 100×100 mm, total length 515 mm) subjected to accelerated corrosion clearly show that stirrups not only can effectively postpone and prevent the longitudinal crack initiation but also can restrict the width of cracks caused by corrosion of reinforcement. Therefore, prediction models should account for the effects of stirrup on reinforcement corrosion-induced cover cracking, and even the effects of load on it.
Modeling and Analysis of Piezoelectric Vibrating Generator of Cantilever
Authors: He Qing , Yan Zhen , Fei Li Kai , Song Bo
Published: January 2012

In order to improve greatly power capacity of cantilever beam piezoelectric generator, output voltage, electric charge and energy of unimorph, bimorph series connection and parallel connection is analyzed by theory models. It can be seen from analytic results that the larger output voltage and electric energy would be obtained if length is increased and width is decreased under the exterior stimulation circumstances. At the same time, bimorph series connection piezoelectric beam should be chosen preferentially.
Bat Algorithm Inspired Algorithm for Solving Numerical Optimization Problems
Authors: Tsai Pei Wei , Pan Jeng Shyang , Liao Bin Yih , Tsai Ming Jer , Istanda Vaci
Published: January 2012

Inspired by Bat Algorithm, a novel algorithm, which is called Evolved Bat Algorithm (EBA), for solving the numerical optimization problem is proposed based on the framework of the original bat algorithm. By reanalyzing the behavior of bats and considering the general characteristics of whole species of bat, we redefine the corresponding operation to the bats’ behaviors. EBA is a new method in the branch of swarm intelligence for solving numerical optimization problems. In order to analyze the improvement on the accuracy of finding the near best solution and the reduction in the computational cost, three well-known and commonly used test functions in the field of swarm intelligence for testing the accuracy and the performance of the algorithm, are used in the experiments. The experimental results indicate that our proposed method improves at least 99.42% on the accuracy of finding the near best solution and reduces 6.07% in average, simultaneously, on the computational time than the original bat algorithm.
Effect of Dynamic Baking on BH Value of Ultra Low-Carbon IF Steel
Authors: Hou Jue , Li Wei Juan , Zhang Li Wen , Dong Xin , Jin Lan
Published: January 2012

In this paper, the ultra-low carbon IF steel was studied by dynamic baking and the influence of dynamic baking process parameters on bake-hardening performance was analysed .The result is: The maximum bake-hardening value occur at 5 min. After 5 min ,the bake-hardening value gradually decreased and stabilized finally. The BH value gradually increases along with the increase of temperature. The BH value reaches to the maximum with the stretch rate of 5.64*10-4mm/s and 0.00169mm/s.The BH value decreases along with the increase of pre-strain increases.
Grid Computing Based Middleware for Labor and Social Security Data Storage Resources Discovery
Authors: Yu Jian
Published: January 2012

Labor and social security social insurance and employment related to large groups of services. The labor security department of information technology often combined with computational grid computing systems. This paper presents a new kind of data grid middleware for data storage resources discovery and dynamic management in labor and social security resources environment. The architecture of grid storage resources discovery and dynamic management is presented for discovering data storage resources from the different computer organizational structure. The middleware can realize the necessary functions for the ultra large-scale application in data grid environment. It could be applied to the ultra large-scale data storage management in grid computing in next generation labor and social security resources environment.
Aircraft Engine Gas Path Fault Diagnosis Based on Neural Network
Authors: Li Chang Zheng , Lei Yong
Published: January 2012

The performance degeneration of components not only reduces the economy of aircraft engine, but also serious threat to the flight safety. Neural network with learning and reasoning abilities is widely used in fault diagnosis. In this paper, a neural network is established with improved BP method. 9 measured parameters of an aircraft engine are selected as features parameters. 21 kinds of gas path failure modes are coded with 5 bits. The data preprocessing methods and the effect of measurement noise are also discussed.
The Study of Technics Behaviors of Micro-Arc Oxidation on Al-Ti Alloys
Authors: Li Shi Jie , Fan Yong Zhe , Liu Li Ya , Du An
Published: January 2012

In this paper, surface morphology and phase constitution of ceramic membrane fabricated via Micro-arc oxidation on Al -Ti alloys was studied .The via Micro-arc oxidation was reacted in phosphate and silicate mixed electrolyte.And by contrasting of phase constitution of the ceramic membrane, the relationships of thickness of the ceramic membrane and time,and the relationships of arcing voltage and time to inquire the features of Micro-arc oxidation on Al -Ti alloys.