bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of Wear and Backlash on Machined PEEK Polymer Bushes and 7075 Aluminium Alloy Cam Plates Used in Robot Joints
Authors: Koike Hitonobu , Kida Katsuyuki , Kanemasu Kenji , Itakura K. , Saruwatari Kenichi , Rozwadowska Justyna , Uryu Megumi
Published: February 2012

Due to constant exposure to high torque and loads toughness, compressive durability and light weight of joint parts are crucial factors for biped walking humanoid robot parts. When polymer transmission parts are used for the manufacture of humanoid robot joint, wear becomes an important factor in terms of transmission error (backlash) between the input and output axes, ex. between the motor and the robot’s leg joint. In such joint system, a polymer bushes is directly connected to a cam plate, playing an important role in the robot's movement ability. In this work, the influence of wear of reinforced poly-ether-ether-ketone (PEEK) polymer bushes in friction against 7075 aluminium alloy cam plates is investigated in order to establish the application possibilities in transmission parts in humanoid robot’s joint. The PEEK bush surface conditions as well as the input axis-output axis backlash require close examination, so that efficient systems can be built. Sliding wear tests were performed on bushes under 0-50kgfcm loaded torque while the cam plate oscillated. Based on the wear observation, it was found that in a high load range the backlash increased along with number of cycles due to PEEK bush wear. The bush surface roughness also increased during testing. Roughness of PEEK bush surface and the loaded torque for output axis were significantly related to backlash of output axis in robot joint.
Dynamic Simulation of Flow Behavior in a New Spray Granulation Tower
Authors: Liu Mei Li , Mao Yu , Wang Juan , Wang Jiang Yun
Published: February 2012

Aiming to understand the asphalt granulation and separation processes in a new technique of solvent deasphalting, this work performs a detailed numerical study of the gas flow behaviors in a spray granulation tower with array nozzles. The influence of nozzle distances and jet angles on the fluid dynamics of the tower, especially on the double swirling flow, is investigated. The simulation results reveal many interesting phenomena, which include a flow consisting of two distinct regimes, a multistage flow development of jet array and a strong dependence of the velocity distribution on the nozzle arrangement.
Detecting Malicious Fast Flux Domains
Authors: Qassrawi Mahmoud T. , Zhang Hong Li
Published: February 2012

Fast-flux service networks (FFSN) are new emerging phenomenon in the internet. Fast-flux networks use proxy networks of compromised machines to redirect and host scam service to achieve high availability. Such technique helps scam websites to avoid being traced and taken down by security professionals. In this paper, we use alternative decision tree algorithm to identify presence of fast-flux domains by analyzing only one address record (A-record) of DNS lookup, which achieves fast detection.
Analytical Solutions of Deformation for Temperature Dependent Functionally Graded Conical Shells
Authors: Zhang Jing Hua , Li Guang Ze , Li Yan Yan
Published: February 2012

Based on classical linear theory of shell, the deformation of functionally graded truncated conical shell subjected to transverse mechanical load as well as non-uniformly thermal load is studied. In the analysis, material properties of the shell are assumed to be temperature dependent, and graded in the thickness direction according to a simple power law distribution in terms of the volume fractions of the constituents. And then obtain the exact solution of the problem in terms of Bessel functions by using analytic method.
Correlation of Hardness with Mechanical Properties of SPCC Steel Spot Weld
Authors: Nghiem Nguyen Quoc , Hwang Hsiu Ying , Chen Jia Shiun
Published: February 2012

The goal of this paper is to develop a method to determine the mechanical properties of SPCC steel spot weld. The mechanical properties of a resistance spot weld could not easily be obtained due to the size of spot weld, and the non-uniformity around the weld zone. This research used an altered approach to obtain the mechanical properties of spot welds. The study based on the hardness measured on spot welds heat-treated surrogate SPCC specimens with the same hardness for the tensile tests. With the tensile test results and hardness measurement data, the correlation of the hardness and yielding strength and of the hardness and ultimate strength could be obtained. In this study, SPCC sheets with thickness of 0.8 mm were welded, and their hardness around the spot welds was measured. Based on the measured hardness, SPCC specimens were heat-treated to reach the hardness measured at different sub-zones of the spot weld. The mechanical properties and microstructure of sub-zones were studied. The relationship between hardness and other mechanical properties were established. The study provides good understanding of the potential failure in spot-welded structures. The results can also be further utilized for computer simulation of spot welds with failure modes to predict the performance of spot-welded vehicle body structures.
The Simulation of Solder Bridging on TuMR Magnetic Head Connector
Authors: Roajanasiri Reangroaj , Afzulpurkar Nitin , Boonsang Siridech
Published: February 2012

The Hard Disk Drive is the important components in the present computer. The Hard Disk Drive manufacturing need high productivity and cost improvement to support the market needs. Many cost reduction are done on product design, material cost and manufacturing operation. This work shows an idea to improve productivity and also reduce the scrap cost by rework process. The product performance will be considered to prevent the reduction of reliability and degradation.
An Improved Airborne Single Observer Passive Location
Authors: Wang Yong , Huang Chang Qiang , Wang Zheng , Li Wang Xi
Published: February 2012

Using phase difference change rate’s augmentation to angular velocity, an improved passive location is developed,which solves the high precision parameter measurement problem of angular velocity in passive location and tracking via spatial-frequency domain information. The simulation shows that this method can reduce the difficulties of parameter measurement. The ranging error is mainly affected by the measurement error of phase difference change rate and doppler frequency change rate. Compared with the original method, it has higher passive location precision.
Comprehensive Line Selection Method Based on the Relative Intensity of Transient Signal
Authors: Shang Li Qun , Zhao Jia Jia , Wang Jiang Ning
Published: February 2012

When single-phase to ground fault happens in non-effectively earthed systems, in order to select the fault line more accurately, this paper puts forward the concept that relative intensity of the transient signal (Q). And based on this, a new method processing nonlinear and the non-stationary single named Hilbert-Huang transform (HHT) was combined with the steady-state zero sequence current method, named a new line selection method which synthesized the transient and steady state quantity. The method makes full use of transient and steady-state line information, to make up for the shortage of the previous method which using single criterion to detect fault line. At last, it was showed that this method is not affected by the fault initial phase Angle and grounding resistance by MATLAB, and also its accuracy and feasibility have been verified.
Failure Analysis of Reinforced Concrete Columns after High Temperature
Authors: Bai Li Li , Song Tao
Published: February 2012

Mechanics models of RC(reinforced concrete) columns is established, after the limit state equation was formed, the failure modes of RC eccentric compression columns after high temperature is analyzed under considering various failure paths. Analysis results indicates that failure analysis is not safe under considering single failure mode, so comprehensive considering failure modes is more matching the true situation than only considering single factor when evaluate reliability of RC eccentric compression columns post-fire
A Revised Clustering Algorithm Based RBF Neural Network Approach for Modeling of an Electro-Hydraulic Servo System
Authors: Chen Ji Lin , Qian Jin , Tong Zhong Zhi , Hou Yuan Long
Published: February 2012

The paper presents an approach to model the electro-hydraulic system of a certain explosive mine sweeping device using the Radial Basis Function (RBF) neural network. In order to obtain accurate and simple RBF neural network, a revised clustering method is used to train the hidden node centers of the neural network, in which the subtractive clustering(SC) algorithm was used to determine the initial centers and the fuzzy C – Means(FCM) clustering algorithm to further determined the centers data set. The spread factors and the weights of the neural network are calculated by the modified recursive least squares (MRLS) algorithm for relieving computational burden. The proposed algorithm is verified by its application to the modeling of an electro-hydraulic system, simulation and experiment results clearly indicate the obtained RBF network can model the electro-hydraulic system satisfactorily and comparison results also show that the proposed algorithm performs better than the other methods.
Development of Centrifuge for Multi-Parameter Combined Environmental Test
Authors: Rong Zuo Chao , He Wen , Shen Run Jie
Published: February 2012

The centrifugal acceleration generated by centrifuge is used to simulate the linear acceleration in multi-parameter combined environmental test. To resolve the problems of current centrifuges, such as difficulty to maintain the balance of their arm and difficulty to install many devices on their arm, as their arm was cantilevered, a disc centrifuge which had large capacity of its arm was developed in this paper. The structure of the centrifuge was described in detail. To perform as a platform for other environmental test devices, power and compressed air for the devices on the centrifuge arm were supplied by slip ring and swivel joint respectively. Finite element analysis on the key parts of the centrifuge was performed to ensure their stiffness to meet the requirements. The control system and the precision of the centrifuge were also analyzed. Experimental results show that the centrifuge is slow to start and stop, and works smoothly, and that the acceleration generated by the centrifuge is stable, and that there is little influence on the power network when the centrifuge starts. The linear acceleration is simulated by the centrifuge quite well.
Design and Implementation of Trajectory Tracking for 3-Axis Servo Table Using UMAC Based on Optimal Preview Controller
Authors: All Bail Mohammed M. Saleh , Tan Yue Gang
Published: February 2012

This paper deals with the use of Programmable Multi-Axis Controller (UMAC) based on preview control method to give good trajectory tracking performance of 3-axis servo table. The paper consists of mathematical modeling, simulation, and an experimental work. Adopt the position coordinate method of three-dimensional space trajectory tracking. In this paper, based on previous research, it gives a trajectory tracking control algorithm, constructs an experimental system used to implement trajectory tracking, establishes its mathematical model, then uses the control algorithm to carry out simulation analysis, and finally uses the simulation results to carry out experimental study. In this paper, the experimental system, which decomposes object trajectory to various axes for tacking, is effective. It takes the best motion controller as the core, and takes servo motor as driving mechanism to drive precision positioning platform. It possesses of powerful real time and linkage performance, and the powerful hardware and software function enable it to have a wide range of applications.
Numerical Simulation and Experimental Study on Bonding Tool Design of Thermosonic Transducer for Flip-Chip Bonding
Authors: Huang Yi Cheng , Li Kun Yang
Published: February 2012

In this paper, the study for the bonding tool position of ultrasonic transducers for thermosonic Flip-Chip LED bonding is presented. Improving the efficiency of ultrasonic transducers plays an important role in the bonding process. To obtain the actual movement of ultrasonic transducer, finite element method ATILA was employed to get more detailed information. To verify the reliability of simulation results, the impedance characteristic and resonance frequency of the transducer mechanical system have been measured using a LCR meter. Moreover, different mounting position of bonding tool on the transducer was studied. Use ATILA to find the best tool position, and vibration amplitude of the tool was measured by Laser Doppeler Vibrometer. Experimental bonding results are verified by in-house shear force test bed.
A High Efficient Variable Cross-Section Compound Ultrasonic Wiredrawing Vibration System
Authors: Shan Xiao Biao , Qi Nai Ming , Wang Li Li , Xie Tao
Published: February 2012

To solve the technical difficult problem of difficult-to-draw materials, this work presented a composite ultrasonic vibration system with variable cross-section rods. The four-terminal network method and the finite element method were used to design the conical, the exponential and the catenary transducers. The finite element results of show that the oval trajectory can effectively improve the friction effect between the wire and the tool head. The experimental result showed that the maximum amplitude was about 60 μm. It was 3 times of that in our previous work. These results demonstrated the design of the composite ultrasonic vibration system was feasible.
Study on Numerical Simulation Method for Motion of Supercavitation Vehicles
Authors: Zhao Jing , Su Yong Yan , Zhao Yan , Wang Guo Yu
Published: February 2012

A calculation method was developed to predict motion of supercavitation vehicles based on the computational fluid dynamics (CFD) model. Control equation of supercavitating flow and motion equations of vehicles are coupling solved through self-made software. This method can directly obtain hydrodynamic data of the vehicle and accurately predict instantaneous motion attitude and trajectory of the vehicle. The simulation results of a supercavitation vehicle motion process show that this method can predict interaction between vehicle and cavity surface and periodic tail beat phenomenon, which accord with experiment results. Furthermore, the periodic variation of vehicle attack angle, which is found in experimental studies, is also caught though simulation. This further proves that the method developed in this paper has an ability to accurately simulate motion of supercavitation vehicles underwater.
Prediction of Residual Life Assesment Using Thermography and Crack Growth Analysis
Authors: Kutin Marina , Vasovic Ivana , Maksimović Mirko , Ristic Marko
Published: February 2012

The most important characteristics for service safety of complex metal structures are those describing crack initiation and growth caused by static or dynamic, variable loading. Crack initiation and growth is subject of numerous investigations by different methods. The paper shows the possibility of applying infrared thermography to the problems of fracture mechanics. The main aim of testing was to qualitative relate the temperature changes of the spacemen measured by infrared thermography with the evaluation of fatigue cracks in steel specimen. Based on the distribution of temperature on the surface of the sample, during the action of force, the spread of plastic zones and crack tip are determined. The increase of temperature produced by the plastic deformation at the crack tip has been measured by infrared camera Thermal CAM SC640, FLIR Systems. SE(B) specimens were tested in three-point bending (TPB), following the procedures of ASTM E1820, on electrical mechanical testing machine with crack tip opening displacement (CTOD) control, at room temperature. Numerical simulation of stress distribution on the same model under same condition is presented, too. The results showed that thermography is a method suitable for monitoring and prediction of crack initiation and growth, as well as critical stress in elastic and elastic-plastic deformations. Fatigue crack growth behaviour of cracked TPB specimen made of S355 J2 G3 steel using Paris relation is considered.
The Comparative Analysis of the Characteristics Drafting with ET and Richforever Clothing CAD Softwares
Authors: Yi Dong Fang , Liu Hui Juan
Published: February 2012

In order to facilitate the users choice and the designers continuous improvements for clothing CAD softwares,the characteristics drafting with ET and Richforever were compared and analyzed through the female top basic block drafting in the paper. The results of the study show either ET or Richforever can satisfy the need drafting,give designers greater freedom to draft and is easy and simple to handle. The function of their intelligent pens is very comprehensive. The characteristics mean that the efficiency will increase and the production cycle will shorten.
Free-Form Two-Dimensional Contour Error Estimation Based on NURBS Interpolation
Authors: Huo Feng , Poo Aun Neow
Published: February 2012

Contouring control is in wide use in the manufacturing industry. To achieve accurate contouring control, accurate control error estimation is necessary. However, for free-form contours, there is a lack of effective algorithms for accurately estimating contour errors. This paper proposes a new algorithm for contour error estimation based on NURBS interpolation (CEEBNI). The reference input points closest to the current position is searched. Based on the NURBS interpolation, certain discrete reference input points are then used to reconstruct the NURBS curve. Finally, the contour error is estimated based on the minimum distance between the current position and this NURBS curve. Simulation results indicate that proposed algorithm gives excellent result in the estimation of the contour error.
Research on PMnN-PZT Ferroelectric Thin Films on Silicon Substrates
Authors: Zhang Tao , Ma Hong Wei , Li Min , Li Bai Hong , Liu Ping
Published: February 2012

The PZT-based ferroelectric thin films own excellent properties, such as good ferroelectricity and excellent piezoelectricity, and the ternary compound PZT-based thin films especially own more excellent properties, which are available to be widely applied in the fabrications of electromechanical devices. However, how to deposit multi-composition PZT-based thin films is a difficult technology. In this paper, the Pb(Mn1/3,Nb2/3)O3-PbZrO3- PbTiO3((PMnN-PZT)) ternary compound thin films are studied on, The thin films are deposited on Si substrates by the magnetron sputtering method, in which the same ratio of PZ/PT=52:48(PZT(52/48)) and the heterostructure substrates of SrRuO3(SRO)/Pt(111)/Ti /SiO2/Si(100) are adopted, and the quench method is always used after the depositions for the post heat treatments. The lattice structures, the surface and the ferroelectricity of thin films are characterized. The results show that the doping of PMnN with 6% mol percent is proper to obtain excellent PMnN-PZT ferroelectric thin films, and the doping of PMnN effectively improve the ferroelectricity of PZT thin films.
Research on Home Appliance Lifecycle Information Management System Based on RFID
Authors: Zhang Qing Hua , Tang Ni , Cheng Guo Quan , Wang Zhuan
Published: February 2012

There are two main aspects of problems in home appliance product lifecycle information management. One is the loss of information and unable to share information in time. The other is the existing bar code and other information recording methods are easy to wear or deface, resulting in low efficiency in information collection and high error rate, even cannot be read. This paper established a home appliance product lifecycle information management system based on RFID. RFID is used to collect and store data. Under such information sharing circumstance, not only integrity and instantaneity of product information are improved, but also the information management of home appliance product lifecycle is strengthened.
The Experimental Study on Friction and Wear Characteristics of 25Cr12Ni5Mo Hot Work Die Steels at High Temperature
Authors: Wang Xing Guo , Xu Jiu Jun
Published: February 2012

High temperature pin-on-disk tester heated by middle frequency induction was designed. Friction test of hot work die steels with the same composition treated under three different heat treatment conditions was carried out by the pin-on-disk tester at high temperature. The experimental temperature were 200°C、300°C、400°C、500°C, applied loads were 1kg、1.5kg、2kg、2.5kg, respectively, pin-on-disk circumrotating speed was 1000r/min for all the experiments. Morphology of worn surface and sub-surface structure were observed by optical microscope. Experimental results indicat that wear loss decrease with temperature increasing. Meanwhile, there are various growing rule under different loads, wear loss increase slightly under low load, but increase rapidly with load increasing, especially increment become larger at low temperature. Morphology of worn surface show that the two-body abrasive wear are mainly mechanism under low temperature and low load condition, oxidation wear and adherence abrasive wear are mainly mechanism under high temperature and high load condition.
Free Vibration of Functionally Graded Material Beams in a Uniform Electric Field
Authors: Yu Shu Rong , De Su Hou , Fan Jian Ling
Published: February 2012

Free vibration of thermal post-buckled functionally graded material (FGM) beams in a uniform electric field subjected to both temperature rise and voltage is studied. Voltage has a great influence on the deformation of the beam, and Thermo-electric post-buckling equilibrium paths and characteristic curves of the first three natural frequencies versus the temperature, the electricity and the material gradient parameters are plotted. It is found that the three lowest frequencies of the pre-buckled beam decrease with an increase in the temperature, but those of a buckled beam increase monotonically with the temperature rise. The results also show that the tensional force produced in the piezoelectric layers by the voltage can efficiently increase the critical buckling temperature and the natural frequency.
NC Post-Processor for 5-Axis Milling Machine of Non-Orthogonal Type
Authors: Li Yu Wei , Sun You Song
Published: February 2012

It is important in practices and engineering applications to study the post-processor of 5-axis milling machines with non-orthogonal structure. A special type of 5-axis milling machines was studied in this paper, in which the axis of the rotary table is fixed at 45° to the spindle. Based on analysis of its structure and kinemics, the post processing algorithms were deduced in detail, including calculation of the table rotary angle and the motion coordinates of the spindle. The post processing algorithms provide the mathematic foundation for development of the CAD/CAM soft ware.
Control of Multivariable Coupling System Based on Improved PID Neural Networks
Authors: Kang Jun , Meng Wen Jun
Published: February 2012

The paper analyzes the characteristics and the situation of the control of multivariable coupling system, combining improved PID neural networks with PSO algorithm, and finally designs a suitable controller model. To achieve a controller model, an initial structure of PID neural networks is established in the first place. Then weights in the network is initialized by PSO algorithm and optimized by improved gradient descent algorithm. A simulation, MIMO coupling system, prove this controller has such characteristics with short time and high precision. The research of the paper provides a new idea and approach for control of complex coupling system.
A Cooperative Search Strategy for Moving Targets Using UAV Swarms
Authors: Wu Wen Chao , Huang Chang Qiang , Li Wang Xi , Xuan Yong Bo , Wang Yong
Published: February 2012

This paper designs a cooperative strategy for unmanned aerial vehicles (UAVs) searching for moving and possibly evading targets. By arranging UAVs into an efficient flight configuration, they optimize their integrated sensing capability, and are thus capable of searching smart targets than uncooperative UAVs. If a UAV is shot down, the team adapts to continue the mission with surviving assets. Simulation results show that our proposed strategy can achieve superior search performance.
Research on Dynamic K-Means Clustering Algorithm in Cyanobacteria Blooms Detection
Authors: Yang Xu , Chen Xiao Rong , Li Yi Ting
Published: February 2012

Cyanobacteria blooms are constantly observed in the coastal waters and pose an enormous threat to public health, economy and ecological environment. The characteristics of blue algal bloom images and feature extraction procedures are analyzed in this paper. The pixel value of Cyanobacteria blooms color images has a significant difference from normal coastal waters images, particularly those of Hue and Saturation. A new method is proposed for Cyanobacteria blooms detection using dynamic K-means algorithm. Experimental results demonstrate the excellent practicability of the proposed detection method. Based on the pixel statistics, it can achieve a highly successful probability of detecting bloom images. Therefore, the proposed detection method can be expected to classify and detect Cyanobacteria blooms in monitoring and forecasting systems.
Study of Partial Discharge Ultrasonic Wave Propagation in Generator Stator
Authors: Yang Yong Ming , Duan Xu , Jiang Fan
Published: February 2012

Currently specific discharge point cannot be effectively located using common electrometric methods of generator stator winding partial discharge online monitoring. To solve the problem an electrical-sound joint detection method has been proposed. Since accuracy of location would be heavily affected by time delay of ultrasonic wave propagation, background noise and spectrum of partial discharge ultrasonic signal were analyzed first, and ultrasound field distribution and ultrasonic wave propagation were also stimulated. Moreover, an ultrasonic sensors distribution method was proposed to reduce the delay estimation error. The method was verified by field experiments. Experimental results showed that the theoretical analysis was exact and the sensor distribution method was feasible, thus laying foundation for further realizing large generator partial discharge Ultrasonic wave on line monitoring and location.
The Centroid Wireless Localization Algorithm of Area in Underground Mine Based on TWA
Authors: Jing Shi Gun , Gu Qing Hua
Published: February 2012

In view of the request of wireless accurate position of workers and equipments, the characteristics of wireless signal transmission and position have been analyzed. Based on the Two Way Arrival and Symmetric Double Sides Two Way Arrival, a multi-Access points Centroid wireless Localization algorithm of area was designed in this paper. And The simulation shows that this algorithm performance is stable, reduces the spread and a range of error by NLOS and can improve the degree of wireless Localization accuracy in underground.
Analysis on the Stability of Supercavitation Projectile
Authors: Wei Ping , Hou Jian , Chen Ting Feng
Published: February 2012

Owing to the existence of supercavition affect the trajectory as well as the stability of motion of projectile. So modeling and controle problems for supercavitation prjectile are complicated and important. The paper analysed the hydrodynamic of supercavitation projectile. And the nonlinear dynamics equatioons motion in body coordinates were obtained. Inorder to obtain the excellent stability performances of projectile, the robust pole assignment method was used to controle the attack angle of head(cavitator). And the attack angle of head effect to the stability of supercavitation projectile was obtained based on stability equtaions. Several structure parameters of the cavitator were designed to compared the contrlole efficiency. Simulation results show that projectile can have good navigation stability through controle the cavitator attack angle. The controle method is of engineering signification.
Dial Instrument Calibration by both Automatic and Half-Automatic Methods
Authors: Bai Zhen Long , Li Xiang
Published: February 2012

This paper presents a calibration system by video processing technique. The system can calibrate large number of different types of dial instruments. The system is composed of an automatic recog-nition approach and a half-automatic approach. Both the automatic calibration and half-automatic calibration include four steps: 1st, dial plane circle edge extraction and center identification; 2nd, pointer extraction; 3rd, scale start and end position identification; 4th, result reading. For half-automatic method, the 1st step and 3rd step are manually indentified. By experiments and practical application in industry, it proves that our calibration system is effective for more than hundreds of different types of dial instruments.
Research on the Complete Dynamic Model of Tilting-Pad Journal Bearings Including Fluid Film Temperature Effect
Authors: Zhang Zhen Shan , Dai Xu Dong
Published: February 2012

Considering the coupling moving of shaft and pads, a theoretical model for calculating the complete dynamic coefficients (CDCs) of tilting-pad journal bearing (TPJB) is described in this paper. The model includes the influence of fluid film temperature. Based on this model, the effect of fluid film temperature on journal equilibrium position, pads inclinations, and complete dynamic coefficients is investigated for given load cases. The numerical results indicate that the effect of temperature is not neglected for the dynamic properties of TPJB. The solution will provide useful tool for precise prediction of dynamic behavior of the rotor systems supported by TPJB.
Compressive Behavior of Aluminium Foams Prepared by Powder Metallurgy Method
Authors: Wei Li , Sinka Csaba , Lawes Simon , Han Tao
Published: February 2012

The compression behavior of closed cell aluminum foams with different density has been examined. Stress-strain curves were obtained. The microstructure evaluation of cell walls was investigated using X-ray computer tomography. A series of images of internal microstructures were given, the structural deformation evolution was analyzed. The images of cell wall evolution shown that crack appeared in cell wall after a small deformation of elastic deformation. As the compression proceeded, further cracks occur and some of the cell walls fracture. The fracture area become expanded, a part of dislocation on the sample side is formed. As the fracture area spreads, some regions become dense. The stress-strain curves showed brittle characteristics. As the relative density increases, yield strength and elastic modulus of aluminum foams increased. The best fit lines are obtained, where, is 0.97 and 0.2 respectively.
Study on Non-Linear Viscous Elastic-Plastic Creep Model of Mica-Quartzose Schist
Authors: Chen Wen Ling , Zhao Fa Suo
Published: February 2012

Firstly, the creep curves of mica-quartzose schist are obtained through the triaxial creep test, the triaxial creep characteristics are found out by analyzing the creep curves. Secondly, a linear viscoelastic model is established by using model theory, a viscoplastic model is established by using empirical formula, added the above two model, a non–linear viscous elastic-plastic creep model of mica-quartzose schist is obtained. Lastly, the creep model parameters are got by data fitting, the good consistency of the test curves and the theoretical curves show the right and reasonable of the creep model. The non–linear viscous elastic-plastic creep model established can well describe the accelerated creep of mica-quartzose schist.
Research on Volume Measurement Technology for Rail Tanker Based on Computer Vision
Authors: Zhao Ji Bin , Xia Ren Bo , Liu Wei Jun , Fu Tao , Huang Yi Jun , Li Jia Zhi
Published: February 2012

In this paper, a computer vision based volume measurement system for rail tanker is proposed. Considering the complex environment, we propose an accurate identification algorithm of coded point and a precise localization algorithm. By investigating the epipolar geometry among three views, this paper develops a novel method for metric reconstruction of a scene based on the trilinear relations. Through the method of ordering incomplete scattered data presented, we construct a series of cross-section contours for a tanker and achieve a precise reconstruction of the surface of the tanker. Experiments show that, the volume measurement method for rail tanker based on computer vision can be operated with simplicity and high accuracy.
A Design of Software Quality Model for Embedded System
Authors: Jeong Hwa Young , Kim Yoon Ho
Published: February 2012

This research aims to make a quality model for embedded system to consider special environment such as the development of adaptation with each system unit, work of interface between the units, and so on. For this process, we extract the attributes to fit on embedded system from DeLone and McLean’s IS model. Their model is not for embedded system but for information system. Therefore we delete and insert some attributes to correspond embedded system functions from their model. The proposed model has three qualities; system quality, information quality and operation quality in system design part, and we make the quality model to consider the relation of influence with each other.
Computer Fitting of Shielding Effectiveness for Electromagnetic Shielding Clothing
Authors: Wang Xiu Chen , Liu Zhe
Published: February 2012

There are not a effective method to describe the distribution rule of shielding effectiveness for electromagnetic shielding clothing at present. A new analysis method of shielding effectiveness (SE) based on NURBS curve is proposed in this paper. With this method, the SE of the local clothing can be fitted with curve to observe the distribution rule. First, a design method of testing points on local clothing is given. Secondly, some concrete functions and program steps of curve fitting are listed. Finially, distribution image of shielding effectiveness on arm position is drew by some experiments. The results show that this algorithm can draw the 3D SE distribution image of local clothing is more correct and can show the distribution rule of electromagnetic wave in local human body.
The Analysis of Stiffness Condition in Rolling Thin-Walled Ring
Authors: Zuo Zhi Jiang , Han Qin You , Dai Min Min
Published: February 2012

The thin-walled ring rolling, a new rolling process, can produce the thin-walled rings that the traditional methods are difficult to process. It has the advantages of simple equipment, low investment and high productive. According to the mechanics analysis of the multiple rollers rolling, it established a mechanical model of small deflection bending compression rod. After solved the mechanics equations, it obtained the thin-walled ring’s rolling stiffness condition. From the theoretical formula, it could find that the increase of friction coefficient, ring radius, roller radius and feed per rotation were disadvantage for the thin-walled ring rolling stiffness condition. However, the increase of the ring cross sectional inertia was advantage for the stiffness condition. The theoretical formula could provide theoretical basis and guidance for the quantity design of roller pairs in rolling machine, design of ring cross section shape and selection of ring raw material.
The Open Colliery Slope Mechanics Stability Analysis and Forecasting Methods Reasearching
Authors: Jiang Hai Bo , Ji Chang Sheng , Shu Ying Qiu , Li Jiang
Published: February 2012

The slope, out-dump ,inner-dump and work-slope, is the important part in the open colliery. Slope should bring the huge loss without effective forecast during the work. Many methods have been used in the slope stability analysis to escape the slope. Dffective landslide forecast can improve the early warning system of landslides and mitigate the landslide disasters. In this paper, the methods used in the analysis have been list and forecast reasearch should be discuss. The better method could be get from integrate the multi-method.
Prediction on Transverse Thickness of Hot Rolling Aluminum Strip Based on BP Neural Network
Authors: Wang Hai Yong , Huang Chang Qing , Deng Hua
Published: February 2012

For aluminum hot rolling process with multi-variables, strongly coupling, nonlinear, it is difficult to establish accurate mathematical model to solve transverse thickness distribution. A method based on BP neural network with hot rolling aluminum transverse thickness prediction was proposed; According to multi-channel measurement characteristics of IMS transverse thickness collection system, the BP neural network prediction model for single channel was established; predicting every channel thickness by BP neural network, transverse thickness distribution of aluminum strip was obtained. Simulation results compared with the measured datas, the relative error is less than 2.5%. The results indicate that the BP neural network is suitable for transverse thickness prediction of hot rolling aluminum strip.
Influence of Load Rate on Arching Action of Reinforced Concrete Frame Beams
Authors: Chen Ming Hui , Ni Nan , Song Xiao Sheng , Su You Po
Published: February 2012

The conclusions can be acquired by experimental study and theoretical analysis.Owing to arching action,limit load of reinforced concrete frame beams can be enhanced largely.With the increase of the load rate,the limit carrying capacity of reinforced concrete frame beam and axis force also raise,but the ductility of the components falls.Theory results are basically consistent with experiment results,error is in allow bound.
Research of MEDM Pulse Power Based on the Non-Resonant Natural Oscillation
Authors: Sun Shu Fa , Di Shi Chun , Wei Dong Bo , Li Zhao Long
Published: February 2012

Aiming to discharge feebly, improving the frequency of MEDM power pulse is an ideal choice. But due to the influence of power resistor, capacitor, inductor with stray capacitance and stray inductance, increasing the higher pulse power frequency met bottleneck. Through the analysis of MEDM discharging circuit and routes, this paper puts forward the theory of not using components, but depending on the natural oscillation of MEDM machine tools and connection line to make MEDM pulse power. Through theoretical calculation and simulation, the oscillation period of discharging circuit can be controlled in 1.5ns, and the pulse width can be less than 750 Ps. It provides theoretical support for making picosecond pulse power and nanometer manufacturing with MEDM.
Study on Formation Precision for Metal Wire Bended
Authors: Guo Fei Peng , Yao Bin , Hong Ke
Published: February 2012

In this paper, a finite element analysis is used to predict accurately the elastic-plastic deformation of metal wire in roll-bended process; this method can transform the deflections of required rolling angle into the compensation of the CNC bending wire manufacture. The conclusion shows that the rolling angle keeps a linear relationship with the final forming angle in a certain range. And it has been proved to be correct and precise under certain conditions by the CNC roll-bended manufacture.
Flexible Distributed Workflow Management Systems Design Based on CORBA
Authors: Li Ya , Wang Hai Rui , Tong Xiong , Zhang Li
Published: February 2012

The paper addresses the problem of flexible Workflow Management Systems (WFMS) in distributed environment. Concerning the serious deficiency of flexibility in the current workflow systems, we describe how our workflow system meets the requirements of interoperability, scalability, flexibility, dependability and adaptability. With an additional route engine, the execution path will be adjusted dynamically according to the execution conditions so as to improve the flexibility and dependability of the system. A dynamic register mechanism of domain engines is introduced to improve the scalability and adaptability of the system. The system is general purpose and open: it has been designed and implemented as a set of CORBA services. The system serves as an example of the use of middleware technologies to provide a fault-tolerant execution environment for long running distributed applications. The system also provides a mechanism for communication of distributed components in order to support inter-organizational WFMS.
Performance Assessment of Jumbo Cylinder Pipe Produced by Rotary Expanding Technology TPCO
Authors: Dong Hong Lei , Li Bang Xian , Shou Bin An , Huang Zhong Guo , Zhang Jun Peng , Yuan Qing Hua , Bo Ke
Published: February 2012

The rotary expanding is one of the best pipe rolling processes for tube trailer cylinders. The thesis briefly introduced the manufacturing technology features and key equipment of rotary expanding mill of Tianjin Pipe Corporation. The indexes of technical requirements were put forward according to relative cylinder standards and test results were given by a third party. Material performance assessment was conducted by China Standardization Committee on Boilers and Pressure Vessels. The results show that the technical indexes of cylinder pipe including chemical composition, nonmetallic inclusion grade, grain size, microstructure feature, surface quality, mechanical performance and bending test can meet the requirements with an international advanced level.
Automation of Authentication and Key Distribution Schemes Design Based on Trace Formulae
Authors: Ocenasek Pavel , Michal Lubos
Published: February 2012

The authentication and key distribution schemes are widely used for providing safe communication. They are used for creating private communication channels in unsecured area. This paper deals with the concept of design of such schemes (protocols) and their properties. The paper starts with the properties and requirements of designed protocol, followed by the description of the design concept based on the trace formula and the process of its automation within the design library. The presented library supports both the handling of protocol properties and protocol design.
Weak Signal Detection Based on the Nonlinear Dynamic Model
Authors: Liu Xuan Chao , Li Pei Pei
Published: February 2012

In order to obtain new ways of weak signal detection, we analyzed the motion states of nonlinear dynamic model Duffing oscillator in the case of different amplitude of input signals by solving the Duffing equation and expounded the basic principles of weak signal detection based on Duffing oscillator phase-change characteristics, further illustrated the relationship between signal detection accuracy and detection time by the experimental, researched the impact on signal detection coming from Gaussian white noise and also pointed out how to use intermittent chaos state to implement weak signal detection. The results showed that Duffing oscillator can be effectively detect the slight changes of input signal in the strong noises background, so as to achieve the purpose of weak signal detection. Compared with existing methods, it could greatly improve the detection results.
Research on Redress System of Vibration Table in Multi-Parameter Combined Environment Test System
Authors: Wang Chun Yu , He Wen , Shen Run Jie
Published: February 2012

The coupling between vibration and centrifugal field is quite strong in multi-parameter combined environment test system. The motion part of vibration table deviates from its original operation position by the action of centrifugal force, which ends in the stuck of armature and causes damage to vibration table. In order to solve such problem, an air-push-type armature redress system with displacement feedback was proposed, which provided a recovering force to counteract the centrifugal force and pushed the motion component to its designed operation position. Some improvements were also made to enhance its reliability. The result of simulation and test about the armature redress system demonstrates that the system has an excellent performance and meets the requirement of counteracting the centrifugal force, which guarantees that the vibration table could work in centrifugal field and multi-parameter combined environment.
Suture Density Study of the Bioprosthetic Heart Valve
Authors: Zheng Yi Hao , Ye Xin
Published: February 2012

In order to investigate the effect of the suture density on the mechanical properties of bioprosthetic heart valve, we establish the spherical leaflets models via computer aided design. Finite element analysis is used simulate the mechanical performance of bioprosthetic heart valve when leaflet is closed. The analysis results show that suture density has a significant effect to the stress state of valve, which may lead not only to different stress peak values, but also to different stress distributions. High or low density suture isn’t appropriate for long-term durability of the bioprosthetic heart valve. Suture density tests are needed to perform on the valves to find satisfactory suture density for better mechanical properties of the bioprosthetic heart valve.
Simulation on Supporting Characteristics of Heavy Hydrostatic Thrust Bearing
Authors: Zhang Yan Qin , Li Rui , Dai Chun Xi , Shao Jun Peng , Yu Xiao Dong , Qin Bai
Published: February 2012

The pressure field of the clearance oil film of the hydrostatic bearing in varies velocities was simulated based on Finite Volume Method (FVM) by the software of Computational Fluid Dynamics. In this article, a conclusion could be drawn that the viscosity has great influences on the pressure in the heavy hydrostatic bearing and it cannot be neglected especially in high rotating speed. The results of numerical calculations provide internal flow status inside the bearing, which would help the design of the oil cavity structure of the bearing in engineering practice.
The Influence of Grain Size and Grain Size Distribution on Sliding Frictional Contact in Laterally Graded Materials
Authors: Khajehtourian Romik , Adibnazari Saeed , Tashi Samaneh
Published: February 2012

The sliding frictional contact problem for a laterally graded half-plane has been considered. Two finite element (FE) models, in macro and micro scales have been developed to investigate the effective parameters in contact mechanics of laterally graded materials loaded by flat and triangular rigid stamps. In macro scale model, the laterally graded half-plane is discretized by piecewise homogeneous layers for which the material properties are speciﬁed at the centroids by Mori-Tanaka method. In micro scale model, functionally graded material (FGM) structure has been modeled as ideal solid quadrant particles which are spatially distributed in a homogeneous matrix. Boundary conditions and loading is the same in both models. The microstructure has modeled as rearrangement and sizes changing of particles are possible to provide the possibility of crack nucleation investigation in non-singular regions. Analyses and comparison of the results showed that micro and macro scale results are in very good agreement. Also, increasing the grains aspect ratio and using optimum distribution of grains decrease stress distribution roughness on the surface. Therefore, the possibility of surface cracking far from stamp’s edges decreased.
Study on Aerodynamic Properties of Impact Plate
Authors: An Xiao Wei , Zheng Shu Ping , Ji Yu Jie
Published: February 2012

An aero dynamical finite element model on rotary hammering test stand was established in this paper. The external flow field of the model was analyzed by CFD module of ANASYS-FLOTRAN. The distribution of flow velocity and that of flow pressure were obtained, which were analyzed to provide theoretical references for optimum design of impact plate.