bluuebunny/crossref_metadata_2025 huggingface dataset:
Non-Parametric Model of Magneto-Rheological (MR) Damper Based on Adaptive Neuro-Fuzzy Inference System (ANFIS)
Authors: Zheng Ling , Liu Fei , Zhou Zhong Yong
Published: January 2012

Magneto-rheological (MR) damper is a typical non-linear actuator. The nonlinear relationship between the input and the output of MR damper should be characterized accurately in order to produce a required control action supplied by MR damper. The challenges of the conventional parametric model are the time-consuming and the requirement of complex parameter identification for MR damper. In this paper, a non-parametric model of MR damper based on the adaptive neuro-fuzzy system theory is presented to overcome the drawbacks of the conventional parametric model. This non-parametric model is developed by means of two adaptive neural fuzzy sub-systems which are designed to describe the nonlinear relationship in MR damper successfully. One sub-system is used to characterize the dependence of the damping force on velocity and acceleration, the other sub-system is used to characterize the dependence of the damping force level on the control voltage. The proposed non-parametric model is identified by experimental results. Furthermore, the accuracy of the model is investigated and evaluated. The model supplies a key technical support to achieve excellent control performances for semi-active suspension systems with MR dampers in vehicle.
Virtual Design and Visual Simulation of Cathode Target on Magnetron Sputtering Coater
Authors: Zhang Yi Chen , Li Can Lun , Li Xin Ying , Li Hui
Published: January 2012

In order to solve the traditional problems such as long designing cycle and high designing cost, the research applies the virtual simulation technology to the design of cathode target on magnetron sputtering vacuum coater. Through analyzing, modeling and simulating, the process model of a typical cathode target on magnetron sputtering coater is proposed. The virtual design of cathode target framework based on distributed collaborative simulation is constructed, which provides a theorial basis for the research of virtual design on cathode target.Using Solidworks software, parts modeling and assembly modeling of cathode target are realized. Using ADAMS, the movements of charged particles in magnetic field and high frequency alternating electric field are simulated, and the visual animation simulation of particles movement is achieved. The research demonstrates the feasibility of virtual simulation technology on vacuum coater design.
Improvement of Zero Suspension Force Performance Using a Special Magnet for a Magnetic Suspension Device
Authors: Sun Feng , Oka Koichi , Jin Jun Jie
Published: January 2012

This paper proposes an improvement method of zero suspension force performance using a special permanent magnet for a magnetic suspension device. The zero suspension force of a permanent magnetic suspension device is indispensable for floating off when the suspended object is stuck on accidentally. Generally, the magnetic suspension system using permanent magnet is difficult to realize the zero suspension force, since the permanent magnet cannot make its attractive force zero. However, the proposed magnetic suspension device has realized the semi-zero power suspension and semi-zero suspension force, which mainly consists of a disk-shape permanent magnet, two “F” shape iron cores, a suspended object, and an actuator. In the magnetic suspension device, since there is magnetic leakage, the suspension force could not be made exact zero. Therefore, in this paper, the zero suspension force will be improved using a special shape permanent magnet. The comparison results indicate that the zero suspension force is decreased about 80 percent.
Design and Implementation of Sensor Network Device Control System with AR Technology
Authors: Sakamoto Naoya , Shimada Hideki , Sato Kenya
Published: January 2012

Sensor networks, which can immediately detect events and situations and automatically control actuators, are expected to proliferate in the future, even though their visualization of sensor networks has not been emphasized. Identifying broken nodes in real environments remains difficult using a traditional visualization tool that plots the virtual diagram on which sensor nodes are put. In this paper, we propose and implement a control system of sensor network devices with AR technology. Our proposed system displays sensor data and network information such as the link status, the packet data, and the traffic in the sensor network on an AR interface. In addition, we control the sensor devices through the AR interface. Our proposed system allows users to intuitively acquire the status of sensor networks. We can also control the devices through the AR interface.
Simulation Analysis on Cymbal Transducer
Authors: Yang Qing Feng , Wang Peng , Wang Yu Hong , Zhang Kai
Published: January 2012

The resonance frequency of the cymbal transducer ranges from 2kHz to 40kHz and its effective electromechanical coupling factor is around 20%. Finite element analysis has been performed to ascertain how the transducer’s makeup affect the transducer’s performance parameters. Two-dimensional axisymmetric model of the cymbal transducer was founded by finite element software-ANSYS, the application of the element type was discussed and the FEM models were built up under the far field condition. Eight groups of cymbal transducers of resonance frequency around 3kHz with different structural dimensions were designed. It was better for choosing the cymbal transducer of the 8mm cavity coping diameter, 20.8mm cavity bottom diameter and 26.8mm piezoelectric ceramic wafer diameter than others for reducing distortion degree of the signal and improving communication turnover in the researched cymbal transducers. It was appropriate for choosing the cymbal transducer of the 8mm cavity coping diameter, 22.4mm cavity bottom diameter and 26.4mm piezoelectric ceramic wafer diameter in order to improve the free-field voltage sensitivity and transmission efficient.
Study of Method of Denoising for Triaxial Flight Simulation Turntable Based on Generalized Minimum Variance
Authors: Luo Yun Lin , Sun Hong Qiang
Published: January 2012

Aiming at dealing with the existing noise of triaxial flight simulation turntable, the paper design digital filter low-pass transmitters and generalized minimum variance control filter to process signal for random disturbance, and have test study based on outside box control system of triaxial flight simulation turntable. The test results show that we can get better control effect by adopting generalized minimum variance control rates to denoise for measured signal on triaxial flight simulation turntable, and that is much helpful to improve the noise control accuracy.
A New Extension of the Rank Transform for Stereo Matching
Authors: Zhao Ge , Du Ying Kui , Tang Yan Dong
Published: January 2012

Stereo matching methods often use rank transform to deal with image distortions and brightness differences prior to matching but a pixel in the rank transformed image may look more similar to its neighbor, which would cause matching ambiguity. We tackle this problem with two proposals. Firstly, instead of using two values 0 and 1,we increase the discriminative power of the rank transform by using a linear, smooth transition zone between 0 and 1 for intensities that are close together. Secondly, we propose a new Bayesian stereo matching model by not only considering the similarity between left and right image pixels but also considering the ambiguity level of them in their own image independently. We test our algorithm on both intensity and color images with brightnesss differences. Corresponding 2D disparity maps and 3D reconstruction results verify the effectiveness of our method.
KPCA Feature Extraction Based on Bacterial Foraging Algorithm
Authors: Li Xue Jun , Yang Da Lian , Deng Zong Qun , Jiang Ling Li
Published: January 2012

KPCA is a commonly used method for feature extraction, for the problems of kernel function and its parameters have a great influence on performance of KPCA feature extraction but the optimal parameters are difficult to select. This paper applied the bacterial foraging algorithm on KPCA feature extraction and the method of KPCA feature extraction based on bacterial foraging algorithm was proposed. The experiment of bearing feature extraction shows that the method which proposed in this paper is effective.
A New Open Curve Detection Algorithm for Extracting the Laser Lines on the Road
Authors: Fan Hui Jie , Zhao Li Po , He Si Yuan , Tang Yan Dong
Published: January 2012

This paper proposes a new open curve detection algorithm for recognizing the laser rays on the road to verify the roughness of the road surface by parsing the curvature of the laser rays. The laser line in the image is first enhanced by the bright line enhance filtering to remove the clutters generated by the background. The enhanced line has the characteristics that its gray value is greater than that of background, so the established energy functional in open curve detection process has a gray value constraint to drive the evolution curve to the brightest place in image. The line on the road surface is an open curve throughout the whole image, so we fixed the two endpoints of the evolution curve to maintain it is an open curve in curve evolution. Moreover, we design an edge inhibit operator to restrain the influence of objects edges to ensure the accuracy of the test laser line. We compared our algorithm with the edge detection operators, and the comparison results showed that our method is more accurate and more robustness to the background.
Design of the Control System for Rehabilitation Horse Based on MCU STC89C52
Authors: Qi Hai Tao , Feng Guang Lei , Wang Hong
Published: January 2012

It introduces a design of the control system for rehabilitation horse based on MCU STC89C52. The system’s control core is an 8-bit MCU STC89C52. First, the user input commands through the keyboard, then send commands to the DA conversion chip PCF8591 which can achieve the digital signal to analog signal output after dealing with MCU. Finally, PCF8591 send analog signal to the speed controller of DC motor in order to control the DC motor’s speed. Meanwhile, it builds a human-machine interface (HMI) to display the real-time speed of the horse through LCD.
Design and Analysis of the Bellows Fatigue Test-Bed Based on Electro-Hydraulic Proportional Position Control
Authors: Zhou En Tao , Shi Sheng Long , Wang Wei Ming , Lin Jun Zhe
Published: January 2012

Electro-hydraulic proportional closed control system is designed which fully integrated electrical and hydraulic advantages of both. The dynamic mathematic model of the hydraulic system is built and the dynamic characteristics of the system are analyzed accurately. The advanced PID controller is adopted to correct the system, and have improved the dynamic quality of the system. In this paper, the hydraulic system is simulated on the basis of the Simulink and DSHplus professional hydraulic simulation software and the results of simulation prove that the qualities of the system can satisfy with the requirement much better.
Reducing Interference of Involuntary Movements in EEG Signal Analysis
Authors: Jung Hee Su , Seo Bo Hyeok
Published: January 2012

Electroencephalogram (EEG) signal has conventionally been recorded with some devices, leads, an electrode cap, amplifier units, and A/D converters. The EEG signal can be contaminated by interference or sensor failures. Among the several artifact sources, an involuntary movement of patient is one of the main sources of interference in the EEG recording. The main objective of this study is to find the time of patient’s movement and to reduce noise effects from involuntary movements.
Design and Analysis of a Novel Wall-Climbing Robot Mechanism
Authors: Dong Wei Guang , Wang Hong Guang , Liu Ai Hua , Li Zhen Hui
Published: January 2012

A novel wall-climbing robot mechanism designed for anti-hijacking task is presented. This mechanism consists of a negative pressure adhesion module, a vacuum suction module and a planetary-gear train. The design of biped-wheel hybrid locomotion mechanism, with the advantages of wheeled robots and legged robots, allows the robot to move fast and cross over obstacles easily. This design qualifies the robot for the motion of moving straight, turning in plane and crossing between inclined surfaces. Then the kinematics equations are derived and the locomotion modes are analyzed. Many experiments have been implemented and the results prove that the robot has such characteristics as rapid speed, excellent transition ability between inclined surfaces and curved surface adaptability. Therefore, this novel wall-climbing mechanism could be used for the application of inspection, surveillance and reconnaissance.
Tracking Testing of Dynamic Errors for Linear Guideway Based on Position Sensitive Detector
Authors: Guo Da Zhong , Zou Yuan Yuan , Zhu Si Jun , Zhao Ming Yang
Published: January 2012

The dynamic precision of linear guideway is very important performance for mechatronic equipments. The dynamic errors for the linear guideway of machine tools can reduce machining precision. In according with the advantage of high-speed response, high detection accuracy and non-contact measurement, position sensitive detector (PSD) is widely used in industrial dynamic measurement. In this paper an approach for measuring the motion stability based on PSD is proposed. The measurement system based on PSD is designed and the measurement errors are analyzed. The measurement results show the approach can measure accurately the motion stability of guideway in two dimensions with features of high precision.
A Study on Teleoperation of a Mobile Robot Using Haptic Feedback
Authors: Kim Yun Bae , Choi Gi Sang
Published: January 2012

Haptic feedback force is often suggested to complement visual information through the sense of touch to improve efficiency and safety in the teleoperation of mobile robot. The efficiency and safety of teleoperation are strongly dependent upon how haptic feedback is presented to the operator. In this study a haptic feedback scheme for teleoperation of mobile robot is developed and its effectiveness is experimentally verified. Experimental results show that the developed scheme improves the quality of mobile robot teleoperation in terms of improvement in efficiency and safety.
A Sludge Cleaning Robot for Sulfuric Acid Tank
Authors: Lim Tae Gyoon , Lee Soon Geul
Published: January 2012

This paper presents development of a cleaning robot for the sludge in sulfuric acid tank. The sulfuric acid is made during SOx capturing process, well known as flue gas desulfurization, and it has very strong corrosion characteristics. The cloud of micro dust in the flue gas settles as sediment in the acid tank. Because the fume produced by the sulfuric acid is very toxic, the sulfate sludge must be removed not by a worker but by an underwater robot having anti-corrosion capability. For this purpose, an underwater robot is developed with anti corrosion materials for its elements such as robot body, drive shaft, wheel, waterproofing seal, power cable, slurry pumping tube, etc. A series of experiments of sludge cleaning shows that the developed robot works well in the real sulfuric acid tank.
Human-Robot Interaction System Research for 500kV EHV Power Transmission Line Inspection Robot
Authors: Guo Wei Bin , Wang Hong Guang , Sun Peng , Ling Lie
Published: January 2012

An assisted and secure interaction system is developed for 500kV EHV Power Transmission Line Inspection Robot. The challenges on amenity, assistance and security of interactive operation are emphasized. Due to the unpredictable line structure and the incomplete sensory, the robot is controlled in remote and locally autonomous mode. Based on the Finite State Machine (FSM), the automatic crossing interface is designed for protecting operators from memorizing redundancy sequences. Measures for friendly operating and avoiding errors are concerned. The architectures for fully autonomous are also engaged. The lab and field experiments validated the interaction system reliable and easy to use.
Development of a Wireless Inertial Measurement System for Pitching Motion Analysis
Authors: Kitamura Seiji , Sagawa Koichi , Tsukamoto Toshiaki , Ishibashi Yasuyuki
Published: January 2012

This paper presents a wireless inertial measurement system to analyze three- dimensional (3D) pitching movement of baseball. Developed wireless inertial measurement unit (WIMU) sizes 43.7×45.2×25.7 [mm], weighs 48 [g] including Lithium-Ion battery, and consists of two types of 3D accelerometers, two types of 3D gyroscopes, release sensor, a microcontroller (MCU), flash memory, and an RF module. Synchronization of start and completion of measurement procedure for plural WIMUs are wirelessly controlled by a host computer. Three-dimensional pitching form of upper limb and trunk is produced by the numerical integration of the acceleration and angular velocity. The experimental results show that 3D posture, trajectory and joint torque in overhand and sidearm throwing are successfully estimated using the proposed system.
The Design of Embedded AeroEngine Measurement and Test System Based on ARM and FPGA
Authors: Sha Yun Dong , Han Jia , Zhao Feng Tong
Published: January 2012

Present Measurement and test system for aeroengine rig testing is primarily based on DSP and PC104 industrial computer, which have the disadvantages of large volume, high power consumption, single function and less-generic. So it is a valuable job to promote the performance of the system employing the latest methods of collaborative design and embedded hardware and software technology. For designing of the new type improved aeroengine test system, a hardware and software co-design strategy is employed. After a thorough trade-off analysis and comparison among different hardware and software systems, an embedded aeroengine test system based on ARM and FPGA is designed, by using S3C2440A CPU with ARM920T core and FPGA from Xilinx as fundamental hardware data acquisition and process platform, using Linux as real time operating system. The data transmission between ARM and FPGA take the path of dual-port RAM, during which the read-write operation is coordinated by means of interruption. The system uses U-Boot to initialize hardware and load operating system. FPGA is used as foreside of data acquisition system, which sampling parameter setting is loaded by reading configuration file during start-up and read into inner register by SPI bus. Data is exported from flash-chip of test system by means of U-disk or network, and analyzed in PC equipped with specialized software. Strong post-proceeding capacity for multi parameters of aeroengine rig testing can be realized, especially for dynamic signal analysis in time domain, frequency domain. Because of the use of the new platform, a big promotion has been achieved. I) the capacity of data processing increases by 15%. II) The new system allows numbers of the sampling channels to double. III) Abundant functions of software can realize more professional, intelligent and generic tests. IV) Sampling frequencies increases by 20%, meeting the demand of monitoring dynamic random signals such as noise and vibration, on fluctuating pressure with wide frequency band. The embedded aeroengine test system based on ARM and FPGA is successful and the prototype is manufactured and tested. It is found that the performance of the new system is promoted significantly, which shows the effectiveness and reliability of the method employed.
Design of Measuring System of ASC (Acupuncture Spot Current) for Constitutional Diagnosis
Authors: Ji Un Ho , Chun Soon Yong
Published: January 2012

In Sasang Medicine, which is a part of Eastern Traditional Medicine, human body is classified by constitutions for diagnosis and treatment. In this study, a fundamental study on the ways and means of measuring the constitutions is classified in Sasang Medicine. A method of measuring ASC (Acupuncture Spot Current) through acupuncture spots on human body is proposed, together with a way to extract characteristic points of measured signals. Based on the characteristic analysis of the measured ASC, it is able to define the measured signals of experimental targets through classification, and the defined characteristics of ASC were determined to be able to be utilized in developing systems for medical constitutional classification.
Fast Volume Rendering Using a Spherical Index Method for Shading
Authors: Wang Yu , Wang Hong , Huang Lu
Published: January 2012

Volume rendering can be used to exhibit the shape and volumetric properties of 3-D objects. However, it requires a considerable amount of time to process the large volume of data. In this article we present a speed-up method by pre-computing some data of the shading model. We index voxel surface normal by and in spherical coordinate system. Each voxel surface normal is pre-computed and stored in array of values [ ]. Some values of the shading model related to voxel surface normal and light vector are also stored. Each rendering we only need updating these values for shading calculation. We found that our speed-up method can reduce about one fourth of computing time but need less additional memory to store surface normal using this spherical index method.
Device Management System Using Group Information on SNS
Authors: Shirakawa Yusuke , Koita Takahiro
Published: January 2012

Recently, ubiquitous networks have become increasingly popular and many devices are connected to them. Devices owned by individuals will proliferate in the future, and we can obtain much information from them and new services will be generated. To use such services, a device management system is quite important for using and controlling the devices. In this paper, a device management system using SNS information is described, and the basic design of the proposed system is discussed.
A Systematic Framework for Building Trusted Online Transaction Environment: Three Information Infrastructures
Authors: Yu Xiao , Chai Yue Ting , Liu Yi
Published: January 2012

Absence of trusted online transaction environment (TOTE) becomes the biggest obstacle to e-commerce development, which embodies three key problems: unauthentic identity information, false product information and insecure transaction process. In order to present a systematic method to build trusted online transaction environment with identity authentic information, accurate product information and secure transaction process, this article puts forward a framework composed of three information infrastructures: Identity Authentication Service (IAS), Product Information Service (PIS) and Electronic Contracts Service (ECS). They have been implemented in online pharmaceutical transaction field in China, and have facilitated all online transaction participants such as pharmaceutical manufactures, dealers, consumers, online market operators and government regulators.
Backward-Auto-Regressive Model Based Rotor-Bearing System Stability Prediction
Authors: Yang Jia Li , Wang Wei Min , Zhu Yong Jiang , Zhang Ya
Published: January 2012

This paper focus on rotor-bearing system parameter identification with impulse excitation in horizon and vertical which is based on Backward -auto-regressive model. Singular value decomposition is applied to reduce the noise and the proper AR model order and de-noising threshold are selected. In this paper, the damping ratio is identified within the different rotating speed and different impulse excitation, and the error is calculated within the different noise level and different AR model order when compared with the ideal model. Though the theoretical analysis, simulation analysis and experimental research, We can indicate that the BAR model has a good performance in system identification and elimination of false modal.
Time-Frequency Characteristics Analysis on Vibration Signals of a Three-Supported Rotor System with Misalignment
Authors: Qi Xiao Xuan , Wang Mei Ling , Lin Li Jing , Ji Jian Wei , Han Qing Kai
Published: January 2012

In light of the complex and non-stationary characteristics of misalignment vibration signal, this paper proposed a novel method to analyze in time-frequency domain under different working conditions. Firstly, decompose raw misalignment signal into different frequency bands by wavelet packet (WP) and reconstruct it in accordance with the band energy to remove noises. Secondly, employ empirical mode decomposition (EMD) to the reconstructed signal to obtain a certain number of stationary intrinsic mode functions (IMF). Finally, apply further spectrum analysis on the interested IMFs. In this way, weak signal is caught and dominant frequency is picked up for the diagnosis of misalignment fault. Experimental results show that the proposed method is able to detect misalignment fault characteristic frequency effectively.
The Model of Equipment Integrated Maintenance Management Based on MES
Authors: Li Xue Jun , Wang Peng , Huang Xin
Published: January 2012

With the development of information technology and use of intelligent sophisticated equipment. Factory automation has improved continuously, the situation of maintenance surplus and maintenance insufficient had often occurred. Through the application research of MES, in-depth understudied fault diagnosis and maintenance technology. In-depth analyzed the theory of equipment integrated maintenance in MES. Designed implementation program for equipment integrated maintenance management for MES by the thought of integrated. Used the idea of segmentation in time and space to establish the model of decomposition for maintenance target. Extraction state information of equipment and parts. Finally, designed operation framework model for equipment integrated maintenance for MES. Analyzed the mode of operation and the process integration of maintenance management detail. Establish integrated maintenance system for equipment in MES implementation to improve the effectiveness of equipment maintenance.
Parameter Optimization in KPCA for Rotating Machinery Feature Vector Dimensionality Reduction
Authors: Jiang Ling Li , Li Ping , Tang Si Wen
Published: January 2012

This research aims at revealing the rules that the impact of kernel function and its parameters on the performance of kernel principle component analysis (KPCA) for dimensionality reduction. KPCA was performed on nine databases by using different kernel functions and a series of equal space kernel parameters. The relation charters between kernel parameters and the number of kernel principle components were constituted. It found that the Gussian kernel and its parameter above 25 are the best choice for rotating machinery feature vector dimensionality reduction by using KPCA. This study presents a reference and gist for the application of KPCA in rotating machinery fault diagnostic case.
A Character of Rotating Machinery Defined Based on KICA
Authors: Jiang Ling Li , Deng Zong Qun , Tang Si Wen
Published: January 2012

This research aims at defining a character of rotating machinery——KIC, that the typical rolling bearing and gear failure modes can be effectively identified by using the character. Firstly, A correlation coefficient matrix is composed by the correlation coefficient between two-two inde-pendent component derived from kernel independent component (KICA). Then the KIC is defined by the correlation coefficient matrix. Experimental results show that the KIC has a good effect for identifying the bearing and gear fault modes, so it can be used as sensitive character for rotating machinery fault diagnosis.
Research on Numerical Method for Fluid-Structure Interaction in Engine Blades
Authors: Tan Zhen , Zhang Peng , Du Guang Yu , Wen Bang Chun
Published: January 2012

A numerical analysis method for fluid-structure interaction (FSI) to analyze engine blades dynamic response was presented. Fluid-structure interaction is an important research field. It is mostly studies the interaction between the influence upon the fluid by the deformation of the solids, the important characteristic of fluid-solid interaction mechanics is the fluid-solid interaction between the both phase mediums. The solutions of strongly coupling and weakly coupling were discussed firstly in this paper. We compared the advantages and disadvantages of the strongly coupling and weakly coupling. And using numerical analysis method based on weakly coupling, we established a fluid-solid interaction control equation taking solid and fluid as a unified mathematical model. And we study about blades deformation and displacement under the action of air loading in engine. Using computational structural dynamics (CSD) calculate the displacements of blades, and using computational fluidic dynamics (CFD) calculate the pressures of blades, completing the fluid-structure interaction analysis in engine blades by iterating this two values(the displacements and the pressures) until the computational convergence solution is obtained. At the end of this paper, the model of fluid-structure interaction and the simulate procession of the numerical analysis method were presented. Based on the analysis, the simulation result is qualitatively discussed referring to the factual conditions of the engine for validating the feasibility of analysis method.
Modal Analysis of Five-Layer Vertical Structure Platform
Authors: Ma Bei Yi , Song Hua , Yu Cheng Zhong , Liu Qian
Published: January 2012

Using the function of static analysis and modal analysis of ANSYS software, the bearing capacity and vibration condition of high-rise buildings can be simulated and analyzed, and the safety for the design of high-rise steel structure can be ensured. This research is mainly aimed at modal analysis for the overloaded five-layer vertical structure platform, and proves the rationality of the structure design by analyzing the conclusion. The analysis content includes: the stress that structure platform is in the static load, the analysis results include analysis parameters such as stress, torque, strain; modal analysis of structural platform, and the analysis results are respectively outputed in forms and pictures. Through the analysis, it can be proved that the structure platform is designed reasonably, and can satisfy the requirement of actual production.
FE Analysis on Contact Properties between Root- Blade and Slot-Disc
Authors: Wang Bo Ping , Wang Jiao , Li Xing Zhan , Han Qing Kai
Published: January 2012

The contact problem between root-blade and slot-disk structure of compressor is of much importance, because there is serious stress concentration in the structure, which is one of the parts with multi faults in aero-engine. First, finite element model for dovetail attachment is established to analyze stress concentration effects. Then, the stress distribution and other parameters such as contact pressure is obtained through contact analysis. In this paper, the finite element method based on contact analysis is used. Calculating results show that equivalent stress, contact pressure of blade-disk structure increase steadily as the rotating speed increases.
The Gyroscopic Effect on Dynamic Characteristics of Dual- Disk Rotor System
Authors: Wang Mei Ling , Han Qing Kai
Published: January 2012

Although the gyroscopic effect on rotor system has been noticed for decades, it is often underestimated and even ignored in the simplified model; moreover the comparing analyses of it on dynamics of rotor system with distributed masses are rarely performed. In this paper, a model of dual-disk rotor system with 8 degree-of-freedoms is developed to show the gyroscopic effects, especially on asymmetric rotor system, in which the polar and transversal moments of inertia of the disks are incorporated. The critical speeds and unbalance responses of such a rotor system are simulated numerically and compared respectively in 4 different asymmetric cases, including 2 cases of position asymmetry and another 2 cases of support stiffness asymmetry. The analysis results clearly show that the gyroscopic effect has obvious influence on the critical speeds and unbalance responses under different asymmetry conditions.
Impact and Sliding Wear Resistance of Hadfield and Rail Steel
Authors: Harzallah R. , Mouftiez A. , Hariri S. , Felder E. , Maujean J.P.
Published: January 2012

Railway networks are subjected to more and more severe loading conditions requiring the use of steels with a high resistance to wear and good fatigue behaviour. The surveys carried out on out of use equipment, such as rails or switches, show that these equipments fail by wear after quite a long period of use, but they can fail by fatigue in a substantially shorter time. In service, crossings are submitted to rolling, impact and sliding stresses. The impact-sliding is the result of the wheel transition from rail wing to crossing nose. Very high contact forces act on the crossing nose while such wheels are passing over it. These large contact forces between wheel and crossing can cause severe damage at crossing nose and wing rail. The influence of contact parameters on the damage of the crossing alloy (Hadfield steel GX120Mn13) in comparison with rail steel (R260) was investigated by impact and impact-sliding tests. The results are described and discussed using weight loss and microhardness measurements, optical and scanning electron microscopy observations of the contact surface. Examination of the results shows large plastic deformation in surface and subsurface of samples. In comparison with impact tests, sliding produces a change in size and shape of the contact area, a higher weight loss and lower hardening. A better impact–sliding wear resistance of Hadfield steel has been confirmed.
Effects of Ageing in Marine Environment on Glass Fibre/Unsaturated Polyester Composite
Authors: Laoubi Khedoudja , Belloul Nabila , Benyahia Ali Ahmed , Sérier Aîcha , Ouali Nourdine
Published: January 2012

The aim of this work is the study of the long term behaviour of a laminated composite made in glass/polyester and aged in seawater at various temperatures. The results obtained show that the immersion in seawater causes ageing of the composite material. This was reflected first by a change in color of the material depending on the temperature of the immersion and the gel-coat loses its brightness. The infrared spectroscopy has confirmed activation of chemical degradation (hydrolysis of the resin and of the fibre/matrix interface, fibre degradation). This chemical degradation could be the cause of decrease in strength and ductility detected by analysing the behaviour of immersed testing specimens. It could also be the cause of the increase of absorption rate recorded for immersions exceeding 22 days.
Symplectic Solutions in Singularity Problems of Anisotropic Beams
Authors: Yang You Zhen
Published: January 2012

Based on the two-dimensional elasticity,the symplectic method is applied to study analytically the stress distributions of anisotropic beam.Using variation principle and introducing separation of variables, dual equations were presented.Then in the symplectic space which consists of the original variables and their dual variables,the problem can be solved via effective mathematical physics methods such as the method of sepatation of variables and eigenfunction vector expansion.So the original problems come down to solve the eigensolutions of zero eigenvalue and non-zeroes eigenvalue that describe the exponentially decaying localized solutions usually ignored by Saint-Venant's principle. Completed numerical examples are newly given to compare with established results.
Temperature Change Influence on Strands Tensile Force in Anchor-Span Suspension Bridge
Authors: Tan Hong Mei , Zeng Yong , Sun Shu Hong
Published: January 2012

Two methods are proposed to study the temperature change influence on strands tensile force in anchor-span suspension bridge, and each force in side-span. The one is based on the relational expression between temperature change and strands force variation; and the other is based on calculation program. Then, take Zhujiang Huangpu Bridge for example. The result shows that: the results of two methods approximate to each other; when the splay saddles are fixed, temperature change generates larger influence of the tensions in anchor span, than the tensions in side-span. The temperature influence coefficient in anchor span reach to -6~-7 kN/°C,while in side-span are -1 kN/°C or so. When the temperature changes exceed ideal temperature range, the force difference between side-span and anchor span will go beyond its maximal friction, so when in construction, measures should be taken to avoid strands sliding. By comparison, when the splay saddles are free, the influence coefficient is much smaller.
Optimization of Released Water from the Dez Dam for Supply of Water Demands in the Downstream of Dam
Authors: Adib Arash , Ahmadeanfar Iman , Salarijazi Meysam , Labibzadeh Mojtaba , Vaghefi Mohammad
Published: January 2012

For supplying of water demands in the downstream of dams, optimization of released water from reservoir of dam is necessary. Released water from reservoir is related to discharge of inflow to reservoir, volume of evaporation from reservoir and storage of reservoir. Water demands are includes of drinkable water and agricultural water demand. If released water from reservoir is less than water demands in a month, this month will be a defeat. After a defeat, reservoir must return to normal condition in order to supply of water demands in next months. For minimize the number of defeats and maximize return ability of reservoir to normal condition, a suitable method must be applied for optimization of volume of released water from reservoir. In this research, two optimum methods (SDP method and GA method) were applied for minimize the number of defeats and maximize return ability of reservoir to normal condition. For this purpose, reservoir of the Dez dam was considered in this research. The Dez dam locates in the south-west of Iran on the Dez River. At the end, it is observed that GA method can minimize the number of defeats and maximize return ability of reservoir to normal condition better than SDP method. But SDP method can minimize damage function better than GA method.
Drying (Consolidation) Porous Ceramic by Considering the Microscopic Pore Temperature Gradient
Authors: Harun Zawati , Gethin David
Published: January 2012

In this work, a two-dimensional numerical model of heat and mass transfer for the convective drying process of ceramic material was developed. The governing equations of fully coupled non-linear partial differential was derived from the most comprehensive model with considering the heat, moisture and gas transport along with the influence of microscopic pore temperature gradient. Through validation the distribution of the measured variables and coefficients (diffusivity) show a good agreement with the drying stage in porous material.
The Hydraulics Similarity Criteria of Anaerobic Bio-Fluidized Bed Design
Authors: Wang Xun , Wang Lin , Shi Yong Sheng
Published: January 2012

This paper aims to deduce the hydraulics similarity criteria of the anaerobic bio-fluidized bed scale-up design. Based on the flow characteristics of solid, liquid, and gaseous phases in the fluidized bed, the dimensionless analysis has been used to deduce the similarity criteria and discuss how to follow these criteria during designing.
Study on Seismic Behavior of Steel Frame with Different Brace Patterns
Authors: Zou Yun , Li Tian Qi , Zhang Da Lin , Zhang Peng Fei
Published: January 2012

In order to analyze dynamic characteristics of steel frame with different pattern braces, three structures with brace of X, V and Λ patterns were designed utilizing STS of PKPM software respectively. Sizes of main members were provided through designed. Based on structural design, time history analysis under different earth waves were made by using ANSYS to investigate the effects exerted from different pattern braces on structural stiffness. Results showed that three different braces played an important role in strengthening structural stiffness. Braces with V and Λ patterns had approximate properties. The story drift ratio and the overall torsion of three different braces met the requirements regulated by Chinese design codes. Conclusions might be useful in practical engineering design during structural system selection.
Secondary Reinforcement in Concrete Corbel
Authors: Rezaei Mehdi , Osman S.A. , Shanmugam N.E.
Published: January 2012

This paper is concerned with finite element analysis of corbels. Analyses were carried out on 254 × 405 × 254-mm reinforced concrete corbels. In this study 24 reinforced concrete corbels were considered. Variables considered in this investigation are: number, position, and different arrangement of secondary reinforcement. The results show that arrangement of the secondary reinforcement affects both strength and ductility of corbels.
Preliminary Research on Particle Size Analyses Method of the Quicklime-Stabilized Dredged Material
Authors: Gui Yue , Zhang Qing , Wei Hai , Wang Qi He , Yhang Hua Hai
Published: January 2012

The paper presents a comparative study of particle size analyses of quicklime-stabilized dredged material (LSDM) by combined sieve-hydrometer method (SHM), laser diffraction method (LDM) and sieve method (SM). After analyzed the testing processes and compared the results comprehensively, some conclusions can be conduction. Adopting SHM and LDM to test the particle size of LSDM, not only break the structure unit of soil, but also change its property due to the pure water used as disperser. In addition, the severe flocculation, which attributed to the dissolvable salt in soil introduced by quicklime can’t be drainage effectively, result in the abnormal particle size distribution (PSD) curves produced by the SHM. Therefore, SHM and LDM are not suitable for the particle size analyses of LSDM. SM, without deteriorating the unit structure of aggregates and altering the properties of soil, should be adopted as the most suitable method for LSDM.
Eight Types of HSC
Authors: Yu Rena C. , Saucedo Luis , Ruiz Gonzalo , Zhang Xiao Xin
Published: January 2012

In this paper we report the composition, mechanical and fracture properties of eight types of performance-designed high strength concrete. The influences of compositions on the material’s brittleness are explained through the calculated reference size of the Fracture Process Zone (FPZ).
Concrete Bridge Durability Design and Maintenance
Authors: Tian Hao , Li Guo Ping , Chen Ai Rong
Published: January 2012

The fundamental approach for solving the durability deficiency is to perform the durability design for planned concrete bridges and the durability maintenance for existing concrete bridges. Most of the existing durability design and maintenance methods, however, are qualitative and contain many subjective factors, which cannot solve the problems such as whether the structure is safe or not throughout the service life. The critical problems, such as the design service life, the environmental parameters, the material degradation process, as well as the lifetime performance assessment method, are found out based on deep insight into the existing concrete bridge durability design and maintenance methods. Finally, the schematics of concrete bridge durability design and maintenance methods that can quantitatively evaluate the degradation process of concrete bridges are proposed and the further research direction is determined.
Electric and Hydraulic Servo Actuator Fault Diagnosis Based on Genetic Optimization Neural Network
Authors: Chen Yin Chao , Yang Wei
Published: January 2012

To resolve the complexity and uncertainty between the fault portent and the causes of electric and hydraulic actuator, a fault diagnosis model base on neural network arithmetic for actuator is designed. The genetic optimization arithmetic is used to initialize the value of weight and bias to improve the search efficiency and global convergence of the network. The simulation result indicate the feasibility and validity of the method based on genetic neural network model to diagnose the faults of electric and hydraulic servo actuator.
A Small Size Environment Monitoring System for Solid Booster
Authors: Huang Wei Dong , Lv Hong , Sui Yu Tang
Published: January 2012

The requirements of environment monitoring system for solid booster of shipboard missile were analyzed, and the scheme of environment monitoring system based on microcontroller and MEMS sensor was present. The hardware units and typical hardware circuits were given. According to the circuits, the PCB board was designed, and the prototype of environment monitoring system was made and tested. It was shown by the test results the designed system can be used for solid booster environment monitoring.
Maximizing Volumetric Efficiency of a Diesel Engine Using an Air Pump to Compress Air-Biogas Mixture into the Engine via Venturi
Authors: Wichettapong Kitti , Bureerat Sujin
Published: January 2012

This paper presents the effect of using a modified air pump to compress the mixture of air and biogas into a single cylinder diesel engine. The crankshafts of both were modified such that two equal size sprockets could be fastened to them. A toothed belt was used to synchronize the crank positions of the pump and diesel engine. By adjusting the angular positions of the crankshaft of the pump at 205 degrees in advance compared to the angular positions of the crankshaft of the diesel engine, the maximum volumetric efficiency of 99.95% could be achieved at 1200 rpm. And when supplementing diesel fuel with biogas via the large venturi, the consumption of 50 cc. of diesel extended to 194.18% at 1200 rpm as compared to running the engine with 50 cc. of diesel alone.
Optimization of LDPC Coded IDMA System
Authors: Zhang Jing Xi
Published: January 2012

The issue of optimization of LDPC Coded IDMA system is studied. The iterative decoding process of LDPC code is called inner iteration, and the iterative process between LDPC code and elementary signal estimator (ESE) is called outer iteration. The performance of the system is shown by BER and the complexity is indicated by iteration number. Check matrix is constructed randomly based on the obtained degree profile and simulations are made. The results show that performance of the system improves as the iteration number increases, either inner or outer iteration number. On the other hand, the performance gain of the system decreases with the increase of iteration number. Besides, the performance can be improved by reasonable setting of iteration number with the same complexity.
Equivalent Viscous Damping Ratio of Steam Turbine Foundation in Nuclear Power Plants
Authors: Zhou Xiang Yang
Published: January 2012

According to the complex damping theory, the formula to calculate equivalent damping ratio of composite structures is derived from damping stiffness matrix by dynamic analysis. The finite element model of a steam turbine foundation is established. The equivalent viscous damping ratio is calculated from natural frequencies, modes and structural stiffness matrix. Due to the vertical stiffness of spring vibration isolator is larger than lateral stiffness of concrete structure, most of free vibration modes of the foundation are movements of concrete structure. Therefore, the equivalent mode damping ratio is close to the one of concrete structure. The dynamic response is overestimated, if the equivalent mode damping ratio is derived from the average of spring vibration isolator and concrete structural ones.
Critical Condition of Dynamic Recrystallization of IN690 Using Strain Hardening Rate
Authors: Wang Zhong Tang , Deng Yong Gang , Zhang Shi Hong , Cheng Ming
Published: January 2012

It had been studied that thermal deformation properties of super-alloy Inconel690(IN690) by thermal simulation on Gleeble 3800 Simulator, which the ranges of temperature was 1000～1200°Cand strain rates was 1.0～80/s. According to the experiment data, the critical conditions of super-alloy Inconel690 had been researched by strain hardening rate. Zener-Hollomn parameters (Z) had been introduced into establish the critical conditions of dynamic recrystallization, such as critical strain and critical stress and peak strain. The results showed that the critical strain model which established using strain hardening rate was in good agreement with that of Sellar’s model.