bluuebunny/crossref_metadata_2025 huggingface dataset:
A New Fatigue Life Calculation Method Based on Non-Linear Cumulative Damage Theory
Authors: Cai Fu Hai , Wang Xin , Zhao Fu Ling
Published: September 2013

Operating characteristics of small and medium tonnage lattice boom crane which withstand fatigue loads was analyzed in this paper. It showed that the lattice boom crane utilization level is in the overlap zone of low cycle fatigue and high cycle fatigue. There may be some plastic deformation in the structure. So the total damage calculated by the Palmgren-Miner rule had a large scatter. Typical operating conditions was analyzed that K-type welded joints of the boom is under axial load and in-plane bending loads. Several critical areas of K-type welded joints were determined by ANSYS finite element calculation software where the stress amplitude was larger on the single side of the lattice boom. A new stress spectrum acquisition method based on the “measured+statistics+compare+simulation” integrated strategy of crane K-type welded joints was proposed. Based on a simplified Huffman non-linear cumulative damage theory, fatigue life of crane K-type welded Joints were calculated based on the strain parameters. They were compared with Palmgren-Miner rule and together with fracture mechanics method. Results showed that although they were all conservative compared with test results, the new method can be applied easily in for engineering applications because it only need amplitude constant amplitude fatigue strain-life data.
Fault Diagnosis of Bearing Based on Selective Ensemble of Multiple Fuzzy ARTMAP Neural Networks
Authors: Xu Zeng Bing , Wu Hong , Shi Tie Lin
Published: September 2013

A novel selective ensemble of multiple fuzzy ARTMAP (FAM) classifiers based on the correlation measure method and Bayesian belief method is proposed to apply to the fault diagnosis of rolling element bearings in this paper. The test results show that the selective ensemble of four optimal FAM classifiers can identify the different fault categories accurately and has a better classification performance compared to the single FAM and ensemble of all FAM classifiers.
The Multi-Model Predictive Control Method Research on the Outlet Temperature Control of Hot-Blast Stove
Authors: Zhang Yin Jun , Su Jian Huan , Lu Zheng Jie
Published: September 2013

It is difficult to establish the precise mathematical model of the outlettemperature of hot-blast stove in the real manufacturing, for the control system ishunting system, with uncertainty, time variation, and coupling. So it will be moredifficult to guarantee the effort of control, based on the control algorithm of precisemathematical model. Aiming at these problems, a new predictive control strategywhich can quickly suppress disturbances has been provided by this paper. Thestrategy is based on the idea of control of dynamic matrix control, and combinesdynamic matrix control and the advantages of both time optimal control. It is proved bythe simulation result that this strategy acts a good effect on the outlet temperaturecontrol of hot-blast stove and will quickly suppress the interference.
Digital Automatic Assembly Technology of Stubble-Cutting Equipment of No-Till Planter
Authors: Bai Xiao Hu , Li Fang , Lin Jing
Published: September 2013

In the process of product design, automatic assembly technology can shorten the time spent on assembling all parts into a virtual assembly. In this paper, a digital automatic assembly technology based on coordinate system constraint was put forward. Appropriate coordinate systems which can ensure the correct location of part were built during the establishment of part model through the datum tool. The naming method of coordinate system was prescribed. All coordinate systems in every part of stubble-cutting equipment were established. The steps of realizing automatic assembly were explained in detail. The functions Pro/Toolkit provides were used to program. The operation results show that the technology can reduce repetitive work, improve design efficiency and provide a convenient tool for the design of stubble-cutting equipment of no-till planter.
Comparison Analysis of Train Derailment between Bridges and Lines
Authors: Cao Su Gong , Chen Rui Lin , Tang Zhang , Xiao Xin Qiang , Hu Hong Bo , Tang Shi Jiang , Liu Yong Qiang , Gao Rui Hong
Published: September 2013

The key factors involved in the train derailment on bridges or lines have been discussed in this paper. Also the statistics of derailment accidents with an upward trend occurred in recent years, all over the world, are listed. Analysis of the reasons for train derailment, geometric criterion and mechanical mechanism of train derailment are discussed. Then the authors make an analysis of difference of train derailment between bridges and lines from five aspects. The conclusions have been drawn from the comparative analysis of train derailment involved in lateral stiffness, derailment time history, flow field, motion equation and resonance. There is no characteristic of time history for a certain distance on line derailment. And the mechanical characteristics of vehicle-bridge system are more complicated than the vehicle-line system under wind loads.
Theoretical Study on Absorption Properties of InxGa1-xAs with Different in Component
Authors: Guo Jing , Yang Ming Zhu , Wang Mei Shan
Published: September 2013

The band gaps and the absorption properties of InxGa1-xAs used as the infrared-extension negative electron affinity (NEA) photocathode are discussed based on first principle. The analysis about the band gaps of the InxGa1-xAs with different In component proves that the models and the computational accuracy are reliable. It is found that the absorption peak P1 moves to the high energy region and the absorption coefficient becomes smaller with the increase of the In component x when the photon energy is less than 4 eV. Absorption peak P3 moves to the high energy region and the absorption coefficient becomes bigger with the increase of the In component x when the photon energy is more than 6 eV. The analysis about the absorption property offers a theoretical foundation for the design of the NEA InxGa1-xAs photocathode according to the photoelectric emission mechanism.
Effects of Sintering Temperatures on the Solid-Phase Synthesis of Lithium Vanadium Phosphate for Lithium-Ion Cathode Materials
Authors: Shi Dao Wu Shuang , Wang Wei , Zhang Zheng , Liu Xing Quan
Published: September 2013

Li3V2(PO4)3/C composite cathode material was prepared by carbothermal reduction using LiOHH2O, NH4H2PO4, NH4VO3 as raw material, sucrose as a coated carbon source, respectively. The electrochemical properties of Li3V2(PO4)3/C composite material prepared at different sintering temperature between 750°C and 900°C were investigated. The results demonstrated that by adjusting the sintering temperature, the electrochemical performance of the Li3V2(PO4)3/C material tends to be excellent, and when the temperature reaches 750°C, the Li3V2(PO4)3/C composite cathode material with the best electrochemical properties can be obtained.
Preparation of Chitosan and Epichlorohydrin Cross-Linked Adsorbents and Adsorption Property of Dyes
Authors: Li Chun Guang , Wang Fan , Peng Wei Gong , He Yan Hong
Published: September 2013

Cross-linked chitosan adsorbents were prepared by modification of chitosan with epichlorohydrin under alkaline conditions. It was showed that chitosan had cross-linked with epichlorohydrin by infrared spectrum analysis. Using scanning electron microscopy, it was observed that the roughness increased and granular material exhibited on the cross-linked chitosan adsorbents surface. Using Congo red solution as simulated dye wastewater, the adsorption properties of cross-linked chitosan adsorbent were detected. The results showed that the adsorption capacity of the cross-linked chitosan adsorbents for Congo red was higher than that of chitosan.
Effect of RF Negative Bias on the Structure and Performance of Diamond-Like Carbon Films in ECR Plasma
Authors: Sang Li Jun , Chen Qiang , Liu Zhong Wei , Wang Zheng Duo
Published: September 2013

Diamond-like carbon films (DLC) were deposited on single crystalline silicon surface under different RF negative bias in microwave electron cyclotron resonance (ECR) plasma source. The chemical structure and morphology were characterized by Fourier transformation infrared spectroscopy (FTIR) and atomic force microscopy (AFM). The friction coefficient of films was measured to examine the film property later. The results show that the smooth and compact deposited films were typical hydrogenated diamond-like carbon with CHn stretching vibration in 2800-3000cm-1. It is noticed that with the increase of RF bias on the substrate the peak intensity for C-H stretching vibration in spectrum between 2800cm-1~3000cm-1increased at the beginning and then decreased, which caused the friction coefficient of the film being smaller and then larger in reverse. In 50W RF biased power one can obtain the maximum-CHn peak intensity and the minimum friction coefficient.
Molecular Dynamics Simulations on Melting of Aluminum
Authors: Li Ji Feng , Zhao Xiao Ping , Liu Jian
Published: September 2013

Molecular dynamics simulations were performed to calculate the melting points of perfect crystalline aluminum to high pressures. Under ambientpressure, there exhibits about 20% superheating before melting compared to the experimental melting point. Under high pressures, thecalculated melting temperature increases with the pressure but at a decreasing rate, which agrees well with the Simon's melting equation. Porosity effect was also studied for aluminum crystals with various initial porosity at ambient pressure, which shows that the equilibrium melting point decreases with the initial porosity as experiments expect.
Research of Weak AC Current Accuracy Measurement Based on ADE7816
Authors: Hu Shuo , Yang Qi Hua , Liu Gang Hai
Published: September 2013

Converted current signal by mutual inductance coil is merely microampere level when using current transformers measure milliamps-power currents, the weak signal is too easily be interference by external environment to achieve accurate measurements. For the power current below 6mA, designed a system based on energy metering chip ADE7816. By analyzing the experimental results, proposed schemes to reduce the measurement error for the first time. The results show that, when the load is maintained at 10Ω and the value of PGA is set to 4 from 0, the average relative error of results is reduced to 0.63%; additionally, when the value of PGA is maintained at 0, but the load Increased to 52Ω from10Ω, the average relative error of results is 0.02%.
Trajectory Tracking Controller Design for Mobile Robots with Bounded Input
Authors: Wang Juan , Zhang Xiu Feng
Published: September 2013

In this paper, the robust trajectory tracking problem has been addressed for nonholonomic wheeled mobile robots with dynamic uncertainties, disturbance and actuator constraints. control theory, LMI theory and principle of MPC are utilized to design robust tracking controller. Simulation is performed to highlight the effectiveness of the proposed control law.
The Source Pick-Up Effect of Multi-Finger GDpMOSTs on ESD/LU Immunities in a 3.3V 0.35μm Process
Authors: Chen Shen Li , Lee Min Hua
Published: September 2013

This paper presents an evaluation of source N+ pick-up influence on ESD/LU immunities for the 0.35μm 3.3V low-voltage pMOSFET devices. It is found that when the stripe number of source N+ pick-up increased, the trigger voltage (Vt1) and holding voltage (Vh) values will be increased, too. Finally, the It2 value of DUTPick-up×5 as compared with a DUTWo pick-up(reference group) is decreased by 10%. Therefore, it can be concluded that the contribution of source N+ pick-up for It2 was not remarkable and recommended in this 0.35μm 3.3V process. Additionally, the Vh value of DUTPick-up×5 as compared with a DUTWo pick-up(reference group) is increased by 9.4%, the source N+ pick-up process can effectively strengthen the latch-up immunity.
Indirect Evaluation of TS-FNN Model Network Structure Based on ETPEM
Authors: Deng Yao Hua , Jin Ling Ling , Chen Si Cheng , Wu Li Ming , Zhang Qiao Fen , Chen Jia Yuan
Published: September 2013

In FWP processing, since the workpiece deformation parameters change with movement and the lag of processing compensation, ETPEM method is taken during the process. This article will establish FWP (flexible workpiece trajectory) processing performance indicators matter-element and TS-FNN model network matter-element to achieve the TS-FNN model network structure goodness evaluation method indirectly on the basis of deep study of ETEPM relevant theories.
Real Three-Dimensional Image Projection System Based on the Volumetric 3D Display Principles and the WPF Framework
Authors: Ping Guo
Published: September 2013

The real projection system image of 3D Rotating cones based on the Volumetric 3D revelation principle and WPF platform is the true image. Compared with conventional 3D display, this system has the naked eye 3D display, so the viewer is no need to wear 3D glasses and 3D display can be achieved .At the same time, this system has a 360-degree holographic image display. The system is designed by using WPF 3D image, which makes it easy to produce 3D images.
Bayesian Network Structure Learning Based on Probability Density Kernel Estimation
Authors: Han Shao Jin , Li Jian Xun
Published: September 2013

The traditional structure learning algorithms are mainly faced with a large sample dataset. But the sample dataset practically is small. Based on it, we introduce the Probability Density Kernel Estimation (PDKE), which would achieve the expansion of the original sample sets. Then, the K2 algorithm is used to learn the Bayesian network structure. By optimizing the kernel function and window width, PDKE achieves the effective expansion of the original dataset. After the confirm of variable order based on mutual information, a small sample set of Bayesian structure learning algorithm would be established. Finally, simulation results confirm that the new algorithm is effective and practical.
An Optimization Designing Method of Fractionated Spacecraft
Authors: Ning Xin , Li Yi Fei , Yue Xiao Kui
Published: September 2013

This article systematically illustrates the concept of the fractionated spacecraft and analyzes the project evaluation and the optimized designs of fractionated spacecraft system from domestic and foreign scholars, then based on those, they presented a new index that random task cycle costs should be regarded as a comprehensive assessment criterion. Next, through modeling the uncertain cost of module development, launch/deployment and full task cycle of Monte Carlo simulation, it provides random task cycle cost of every configuration scheme. Lastly, it establishes the partitioning criteria and partitioning method system for fractionated spacecraft, with further modules' partitioning road map based on pedigree clustering method. The optimized designs are determined according to classification level combined with the actual situations.
Plane Reflection in the Application of Virtual Reality System
Authors: Pu Ke Ming , Wu Feng , Jiang Hong Bin , Sun Dan Lv
Published: September 2013

Real-time plane reflection is shown by adding a mirror camera. Roaming scene, capture the mirror image of the scene and the mirror image map to the reflection plane by projection. The multi-layer superimposed image is processed on the reflection plane, by different of superposition algorithms, different results obtained, that displays the effect of different plane reflection.
Facial Expression Recognition Based on Gabor Filter Performance Analysis
Authors: Shi Dong Cheng , Cai Fang , Shi Xiao Ding
Published: September 2013

This paper extracts the Gabor phase feature information to classify facial expression. First, preprocessing the image for obtaining the normalization image of pure expression, Gabor transform has good space-frequency localized and multi-directional selectivity, so uses Gabor filter with five frequencies and eight directions to filter the pure expression image. By changing the filter's center frequency, get the optimal image after filtering, and then extract the phase features, carry on the dimension reduction. Finally, with nearest neighbor classifier to classify, a better experimental result had shown in JAFFE database.
An New Method for Multi-Object Tracking Using Energy Minimization-Based Data Association
Authors: Wang Zhen Hai , Hong Ki Cheon
Published: September 2013

multiple object tracking is an active and important research topic. It faces many challenging problems. Object extraction and data association are two most key steps in multiple object tracking. To improve tracking performance, this paper proposed a tracking method which combines Kalman filter and energy minimization-based data association. Moving objects are segmented through frame difference. Its can be consider as the vertex. All detections in adjacent frames are be used to construct a graph. The energy is finally minimized with a graph cuts optimization. Data association can be consider as multiple labeling problems. Object corresponding can be obtained through energy minimization. Experiment results demonstrate this method can be accurately tracking two moving objects.
Improved LLE Algorithm Based on Supervision
Authors: Gan Li Li , Chen Si Si , Cao Juan Juan , Wu Zhong Yong
Published: September 2013

It focuses on locally linear embedding algorithm into LLE proposed supervised locally linear embedding algorithm (SLLE). That supervised manifold learning algorithm, which introduced adjustable parameters to effectively use the classification information, so as to make the SLLE have a stronger effect for classification problems. Finally, through a series of experiments to fully illustrate the proposed improvement of the effectiveness of the algorithm, the proposed oversight of the manifold learning algorithm can more effectively enhance manifold learning algorithms for classification problems proficiency.
Effect of Several Parameters on Pitch Perception of Unresolved Harmonics
Authors: Wang Jian , Guan Tian , Ye Da Tian , Chen Zhi Peng
Published: September 2013

This paper studied the effect of several parameters on pitch perception of unresolved harmonics by measuring fundamental frequency difference limens. The parameters included roving fundamental frequency or not, type of background noise, and cutoff frequency of lowpass pink noise. Results found that performance was significantly worse when the fundamental frequency was roved than the constant case, lowpass pink noise had similar ability to mask combination tones as threshold equalizing noise, and that combination tones could be masked if the cutoff frequency of the lowpass pink noise was not lower than the frequency of the tenth harmonic. This paper proposed a set of appropriate parameters for experiments of pitch perception, which suggested that roving fundamental frequency, using threshold equalizing noise with the level of about 8-13 dB below the level per component of the stimuli, or using lowpass pink noise with the cutoff frequency not lower than the frequency of the tenth harmonic, can achieve effective performance for pitch perception.
Pseudo-Interference Technique for Reducing the Mutual Coupling Effects in Adaptive Beamformers
Authors: Chu Yi , Horng Wei Yau , Wang Shinn Fwu , Lay Shyh Rong , Liao Yu Pin
Published: September 2013

A robust beamformer with pseudo-interference approach for reducing the effect of mutual coupling is present in this paper. This technique uses injected interference to improve the equivalent interference-to-noise ratio in the diagonally loaded Capon beamformer. The mutual coupling coefficients are estimated for interference correlation matrix reconstruction. The resulted beamformer is insensitive to the mutual coupling effects and angular mismatch.
Trust Transfer in Pervasive Computing
Authors: Xu Kang , Li Wen Jun , Ma Yong , Liu Heng
Published: September 2013

This paper develops new methods for Trust Transfer in sparse environment based on indirectly feedback. Trust relationship between the user and strange service provider was build and adjusted automatically by the other users. We present two techniques, the first one is called Trust initialization algorithm, which is about to initialize trust relationship between user and strange service provider, and the second one is named Trust regulate algorithm based on the dynamic period feedback regulate mechanism. The simulation result demonstrate that this trust transfer method effective.
An Integrated Wireless Communication System for Remote Pastoral Areas in Tibet
Authors: Huang Cao , Guo Xiao Jun , Liu Ze Guo
Published: September 2013

To support mobile communications in remote pastoral areas of Tibet effectively, this paper proposes an integrated wireless communication system including mobile ad hoc network (MANET), wireless senor network (WSN), cellular network and Beidou satellite network. The overall integrated wireless communication system and the relevant elements are described specifically. The proposed system can help to reduce the network deployment cost and provide voice, message and low rate data services.
Connectivity Analysis in Wireless Ad Hoc Network Based on Interference and Fading Channel
Authors: Li Qian , Zhu Qi
Published: September 2013

Connectivity is the fundamental of the Ad Hoc wireless network for end to end data transmissions. It becomes difficult to keep the connectivity when uncertain features increase, such as fading channels and interference in the network. Based on the theory of stochastic geometry, a SIR model is used to calculate the link probability between nodes. We derive a tight explicit expression for the connectivity probability in the present of Rayleigh fading and interference. According to this expression, we can optimize network topology efficiently. Simulation results validate the accuracy of our conclusion.
An Algorithm for Resource Optimum Scheduling for Virtual Machine Services on Clouds
Authors: Dong Yue Li , Guo Quan , Sun Bin
Published: September 2013

Resource optimum scheduling with resource constraints is a complicated optimization problem. In this paper, in order to address complex resource management issues, some optimizations are adopted, such as, making use of the spare time between two subtasks which are on the same node, optimizing the order of executing subtasks, and so on. The algorithm can approximate the optimal solution quickly and stably. The simulation results demonstrate that the algorithm works effectively for this class of problems.
Overview of Chinese Word Segmentation Method
Authors: Liu Shu Xian , Li Xiao Hua
Published: September 2013

This article provides a brief introduction to Natural Language Processing and basic knowledge of Chinese Word Segmentation at first. Chinese Word Segmentation is a process of turning a series of Chinese characters into a series of Chinese words with some rules. As the fundamental component of Chinese information processing, it is wildly used in correlative areas. Accordingly, research on Chinese Word Segmentation has important theoretic and realistic meaning. In this paper, we mainly introduces the challenge in Chinese Word Segmentation, and presented the categories of Chinese Word Segmentation method.
Oriented-Sensor Web Framework Based on Web Services
Authors: Qian Hai Zhong , Cai Li Li
Published: September 2013

In order to achieve the vision of sensor web, an oriented sensor web framework based on web services is presented in this paper. It provides a mechanism that varied sensor networks or devices can be connected to the framework. End-users can access sensor networks and integrate the sensor to their special applications through a stack of Internet standard protocols.
Parts Information Extraction and Storage of 3D-CAPP System Oriented Virtual Manufacturing
Authors: Sui Xiu Lin , Zhang Guang Lei , Wang Qing , Sun Quan Ying , Zhang Xue Wei
Published: September 2013

Integration of CAD and CAPP system is always a difficult problem in the research, the reason is that the information expression is not consistent. As the output of the CAD system, STEP standard can provide a unified interface to the CAPP system information extraction. In this paper, based on STEP neutral file part feature information extraction and recognition technology, the output from the CAD geometry STEP neutral file includes geometric characteristics information and manufacturing information, the STEP information was transformed into a format recognized by CAPP system. Based on the above research, the process design system was developed based on the information extraction and storage of parts of STEP system, and the system feasibility was proved.
User Passwords Sniffing and Defense in LANs
Authors: Zhang Shu Guang , Sun Qiao Yun
Published: September 2013

In this paper, the network security of LANs and the data sniffing theory is discussed. The sniffing and intercepting process of FTP and Telnet login usernames and passwords is described. Its not safe to transmit data in a network without encrypting any data. In order to keep important information safe, it is necessary to encrypt those important data before transmission, especially login usernames and passwords. SSH is a secure protocol used to make up for the defect of traditional TCP/IP protocols. By using SSH, the important messages such as login usernames and passwords can be encrypted. It is very difficult for a network attacker to retrieve the important messages even if he has captured those encrypted messages.
Research and Implementation of IPSEC Based on TD-LTE System
Authors: Huang Lian Fen , Liu Hang
Published: September 2013

With the rapid development of Internet technology, network and information security has become increasingly important. After studying the principle of IPSEC(IP Security) and VPN (Virtual Private Network) technology, this paper designs a network architecture which is called S1 in the TD-LTE communication system. The specific packet is securely encrypted by using IPSEC technology between the base station and security gateway. After a lot of tests, the technical solution to achieve IPSEC is proved to be realized and to have a highly efficient and stable characteristic.
Research and Design of Superscalar Pipeline Processor Based on CPLD Technology
Authors: Yan Chang Qin , Yu Yan Yan , Huang Qian , Yang Jun
Published: September 2013

Superscalar pipelining is to improve instruction-level parallelism and advanced technology, and is widely used in the computer's central processor and graphic accelerator. In this paper, we made use of advantage of CPLD devicesinherent flexibility, usability, predictability and so on, to achieve superscalar pipelining, designed and constructed a processor model superscalar pipeline machine based on RISC instruction set. Using EDA technology with top-down design methods, and gave the processor model hardware verification and performance test results, and had explored the use of EDA technology processor design ideas and methods.
Characteristic Analysis for the Internal Flow Field of CVT Torque Converter Based on FLUENT
Authors: Liu Jin Gang , Xiong Le , Tan Yuan Qiang
Published: September 2013

According to the issue of CVT torque converter internal flow field such as the complexity and not easy to calculate, the channel model of torque converter is established by UG, the grid of channel model is generated by GAMBIT, the internal flow field of torque converter is simulated based on FLUENT while the pressure and velocity distribution of flow field are calculated under three different conditions. The results show that analyzing the flow field of torque converter by FLUENT has certain guiding significance for the design and optimization of torque converter.
Investigation of the Flow in Valveless Pumps
Authors: Bai Lan , Guan Li Na , Luo Yue Gang
Published: September 2013

An investigation of flow in valveless micropumps is presented. Numerical simulations are done using ANSYS. It is found that both laminar flow and turbulence phenomena would occurs in the diffuser/nozzle element. And SST (shear stress transport) turbulence model is chosen to be the most appropriate turbulence model,The simulations show when the opening angel gets bigger, the flow in the micropump, especially in the diffuser/nozzle becomes unsteady. When separation flow of fluid appears, pressure loss coefficient decreases rapidly.
Applicability Research for Masonry Mortar Compressive Strength Curve Using Penetration Resistance Method
Authors: Zhao Xiao Li , Bai Yu , Zhou Li Chao , Shi Jiao , Kuang Hao Wei
Published: September 2013

This paper mainly introduces the strength curve of Yunnan regional standard for Technical specification for testing Compressive Strength of Masonry Mortar by Penetration Resistance Method. Furthermore, it researches the distinction in applicability and the accuracy between Yunnan regional and the national specification.
A Novel Power Reserve Operating Scheme of DFIG
Authors: Tian Xin Shou , Han Zhong Xu , Tian Jian Feng
Published: September 2013

The system equivalent rotary inertia and frequency control capability are decreased with growing continuously of wind power penetration, because the doubly fed induction generator (DFIG) is decoupled from system frequency, which will bring a new challenge to the large wind power integration. On the basic of analyzing power-speed characteristic of DFIG which operates at different wind speeds, the de-load operating strategy of DFIG based on coordinated controlling of over-speed and changing pitch was proposed, at the same time the de-load operating curve of DFIG was given through calculating, and the enhancing of kinetic energy was proved by theoretical analysis. And the power reserve capacity of system is enhanced.
Flow Field and Static Pressure Analysis of Adsorption Principle of Wall-Climbing Robot
Authors: Ma Yi Tong , Li Fang Xing , Gao Xue Shan , Bo Wei Jie
Published: September 2013

The impeller is key element that brings about negative pressure adsorption. The efficiency of the impeller will determine the adsorption capacity of robot. In this paper, physical model is built based on the theory of fluid dynamics by taking a common high speed rotation of impeller as a research object. The basic parameters and boundary conditions are set and a 3D fluid dynamic simulation is done based on FloEFD. The factors such as blade curve, rotational speed and air inlet velocity which have effect on surface flow field impeller are investigated. Then the results are shown by figures and the study analysis is carried on.
A 5 Bit to 6 Bit Reconfigurable Delay Line ADC Implemented with Changing the Length of Delay Line for Digital DC-DC
Authors: Wang Chuang , Zhao Li Juan , Li Zun Chao , Zhang Zhi Yun
Published: September 2013

This paper implements a 5 bit to 6 bit reconfigurable delay line ADC implemented with changing the length of delay line for digital DC-DC. The comparator, 33 delay cells and the decoder of the ADC is shared to reduce the area and power when this ADC works and changes accuracy. A detect and control logic is designed to change the input offset current of every delay cell to protect the delay line work correctly when the accuracy of ADC is reconstructed. Circuit performance is analyzed theoretically and simulated under CSMC 0.5um process. This paper designs a window delay line ADC whose voltage sensing range is 1.352V to 1.448V, LSB is 3mV or 1.5mV and sampling frequency is 4Mhz.
Design of Interface Connecting PC/104 Based Electro-Hydraulic Servo Actuator & CAN Bus
Authors: Xu Bing , Wang Hong Li , Liu Fu Li , Zheng Yuan
Published: September 2013

In order to connect electro-hydraulic servo actuator to CAN network, one interface is designed for connecting electro-hydraulic servo actuator to CAN network. In this article, the author expounds design thinking and realization method for interface hardware and software. The card is applied in practice, and the practice proves the feasibility of the design method.
Characteristics of Real-Time Imitation Control for Biped Robot: Communication Time Analysis
Authors: Cui Yi Feng , Shon Su Goog , Byun Hee Jung
Published: September 2013

To realizing the imitation control of the biped humanoid robot, synchronous question is the core problem. Falling time of the robot and reflecting time of the operator both are the components which to real-time control of the robot. If the robot can walk well in limited time, between the two parts time questions, communication time need us to analyze. Based on the imitation control structure of our robot control system, characters of control model and communication system were studied and conclusions show that synchronous control for a robot by a human is difficult to realize and some other stable control methods need to add in the research.
The Internal Fixator Principle Applied to Proximal Tibial Fractures - An Early Gait Analysis Study
Authors: Crisan Dan , Stoia Dan Ioan , Prejbeanu Radu , Vermeşan Dinu , Hărăgus Horia
Published: September 2013

The internal fixator principle is a novel, minimally invasive approach to epiphyseal fractures of the long bones. It has been advocated to provide a stable fixation of fracture fragments with the preservation of the osseous blood supply due to the lack of periosteal decortication. The aim of this minimally invasive technique is to allow for early rehabilitation, so in theory patients that went trough minimally invasive internal fixation osteosynthesis should have better clinical results with higher scores than patients that had classic ORIF technique. We investigated a number of 18 tibial plateau fractures in 18 patients that were matched by fracture classification and patient sex and age, 9 were treated by conventional plating techniques and the other 9 were treated by using an internal fixator. The patients were evaluated pre and postoperatively by conventional radiographic means and by CT scanning with 3D reconstruction, they were evaluated with the KOOS score at 3 and 6 months postoperative. Gait analysis was performed in the lab using a Zebris FDM System and a Zebris CMS 10 3D Movement Analysis System. Gait analysis was performed based on patient availability as soon as ambulation was possible and permitted without auxiliary support (crutches). KOOS scores increased from 3 to 6 months, the initial evaluation showed a mean value of 27,5 (19,7 to 39,4) for the ORIF group and a value of 33,9 (24,1 to 42,4) for the internal fixator group at 3 months, and increased to 64,8 (55,3 to 73,1) for the ORIF group and 69,8 (59,7 to 82,7) for the internal fixator group. The difference between stance and swing times, knee flexion angles and was found not to be statistically significant (p<0.05) at either 3 or 6 months postoperatively. The data shows no clear advantage in using an internal fixator over the classic plating methods at 6 months postoperatively. The minimally invasive technique provided for faster wound healing with better KOOS scores at 3 months but there was no statistically significant difference at 6 months postoperative. Limitations of the current study are the relatively small number of matched patients and the heterogeneity in patient physical characteristics such as patient weight and height and the level of preoperative fitness.
Approximate Solutions to a Cantilever Beam Using Optimal Homotopy Asymptotic Method
Authors: Marinca Vasile , Herisanu Nicolae , Marinca Traian
Published: September 2013

The response of a cantilever beam with a lumped mass attached to its free end subject to harmonical excitation at the base is investigated by means of the Optimal Homotopy Asymptotic Method (OHAM). Approximate accurate analytical expressions for the solutions and for approximate frequency are determined. This method does not require any small parameter in the equation. The obtained results prove that our method is very accurate, effective and simple for investigation of such engineering problems.
Troubleshooting Technics to Identify the Airborne and Structure-Borne Noise Content inside an Electric Vehicle
Authors: Morariu Marius Cristian , Lupea Iulian , Anderson Colin
Published: September 2013

An electric vehicle was subjected to on-road acoustic tests. A specific high frequency tone was perceived in a sound field dominated by wind and road noise. The car was instrumented with microphones which measured the noise inside the passenger compartment and with tachometers to record the motors rotational velocity with respect to time. Waterfall diagrams were generated by tracking the spectrums of noise from fixed time samples against the rpm of the motor. The analysis of the diagrams revealed that high orders, like the 24th and 48th were responsible for the sound. These orders represent the acoustic response of the electromagnetic interaction between the stator and the rotor of the electric motor. To analyze the propagation of noise from the source (motor) to the target (driver), a transfer path analysis (TPA), respectively an airborne source quantification (ASQ) were proposed. The TPA focused on the structure borne noise generated by the forces transmitted into the body through the powertrain supports, and the ASQ, on the airborne noise radiated by the surface of the motor and gearbox casing. The conclusion was that the airborne noise is the main contributor to the total pressure level in the passenger compartment, but at lower speeds a strong structure borne noise content is present.
Some Models of Elastomeric Seismic Isolation Devices
Authors: Iancu Vasile , Gillich Gilbert Rainer , Iavornic Claudiu Mirel , Gillich Nicoleta
Published: September 2013

For the study and design of the elastomeric seismic devices is essential to know the mathematical relation between the horizontal displacement and the force leading it. In this paper we present mathematical models for three types of devices: (i) natural rubber bearings, (ii) lead rubber bearings and (iii) hybrid device combining the two first mentioned bearings. For all devices the specific domains of operation are determined and for each domain the relations connecting horizontal displacement and stiffness is contrived, highlighting the hysteretic behaviour in respect to ground excitation. Finally we present numerical results and a comparison between the three devices, defining the opportunity to involve them in specific applications, in function of the type and nature of the isolated structure.
Effect of Fiber Directions on the Surface Quality of Milling C/SiC Composites
Authors: Bao Yong Jie , Bi Ming Zhi , Gao Hang , Cao Bo
Published: September 2013

ts difficult to guarantee the surface quality when processing the carbon/silicon carbide (C/SiC) composites, and also easy to produce burr defect. So firstly the law of the burrs generated on different direction of fiber was analyzed theoretically. And then we milled the C/SiC composites by electroplating diamond cutting tool with different cutting parameters and fiber directions. The cutting force and the burr area size of the milling surface were also tested. After analyzing the results, the milling burr evaluation method was proposed. Then the burr area size of different fiber directions was analyzed, and the effect on the surface quality of fiber direction during milling process was studied. The result shows that the angle between surface laid carbon fiber direction and cutting direction has a significant influence on the processing quality. Milling surface quality was declined in order as 0°, 45°, 90° and 135°. So in order to improve the quality of the milling surface, the angle between surface laid fabric fiber direction and cutting direction should be less than 45°.
Optimization of Process Parameters Based on Multi-Process and Multi-Evaluation Index for Function Ceramics in CMP
Authors: Hu Zi Hua , Peng Jiao , Gao Man Ke
Published: September 2013

To enhance polishing quality, polishing efficiency and improve the backward state based on single-process way for function ceramics in CMP, a new optimization method of process parameters based on multi-process and multi-evaluation theory is put forward. Firstly, based on experimental data obtained from orthogonal experiment, the optimal combinations of process parameters are got separately in term of surface roughness and material removal rate, which is optimized by Taguchi method in each process. Secondly, combining analysis of evaluation index weight ratio with analysis of variance, the final optimal combination of process parameters is received under the integrated evaluation of surface roughness and material removal rate. Finally, the contrast verification results show that the proposed optimization method is effective.
Surface Quality of Textured Surface on Cylindrical Inner Surface Using Whirling Electrical Discharge Texturing
Authors: Lertphokanont Vitchuda , Sato Takayuki , Ota Minoru , Yamaguchi Keishi , Egashira Kai
Published: September 2013

Whirling Electrical Discharge Texturing (WEDT) was developed to create microstructures. It was thought that textured surface with low surface roughness could reduce friction coefficient on the sliding parts. In this research, surface quality was studied to evaluate the quality of WEDT textured surface. Surface quality was evaluated in terms of the surface roughness and surface integrity which were characterized by microstructure, composition and residual stress of the textured surface. The value of Rp and Rv of textured surface after finishing with improved finishing method were obtained as expected for low surface roughness to reduce friction coefficient. In addition, it was clarified that microstructure and composition of textured surface after texturing with WEDT and finishing with lapping-film depend on feed speed. Furthermore, the compressive residual stress was presented on WEDT textured surface and depended on feed speed. It was confirmed that good surface quality of textured surface could be obtained by WEDT.
Grinding Characteristics of Porous Composite-Bonded CBN Wheels
Authors: Chen Zhen Zhen , Xu Jiu Hua , Ding Wen Feng , Ma Chang Yu
Published: September 2013

Based on the orderly distribution alumina bubbles in working layer the porous composite-bonded CBN wheels were fabricated and grinding experiments of nickel-based alloy were carried out in comparison of the vitrified counterpart. Results show that the grinding force decreases and increases respectively with the increasing wheel velocity and depth of cut. The specific grinding energy reduces graduately from 465 to 93 J/mm3when the maximun underformed chip thickness increases from 0.4 to 1.7 μm. Compared to the vitrified CBN wheel, the grinding forces, temperatures and specific grinding energy of the porous composite-bonded CBN wheel are always lower than that of the vitrified one. Its attributed to the graphite lubricating and alumina bubbles pore-forming effects. The larger chip storage space, sharper grit edge and less adhesion on the wheel surface surpport the advantages of the porous CBN wheel.
Dry Sliding Wear of As-Cast and Thermomechanically Processed Low Chromium White Cast Iron
Authors: Gao Xing Jian , Zhang Qi , Wei Dong Bin , Jiao Si Hai , Jiang Zheng Yi
Published: September 2013

This investigation attempts to improve the wear resistance of low chromium white cast iron (LCCI) by thermomechanical treatment. The thermomechanical treatment of the brittle LCCI with crack-free was successfully carried out by bonding it with a ductile low carbon steel firstly. Afterwards the dry sliding wear behavior of as-cast (LCCI-A) and thermomechanically processed (LCCI-B) samples was studied using a pin-on-disc apparatus under different test conditions. The microstructural examination shows that the refined supercooled austenite and plenty of secondary carbides in LCCI-B replaced the original microstructure of martensite and retained austenite with network carbide in LCCI-A. This significant evolution is beneficial to form and stabilise the oxide layer on the substrate, which makes the oxidational wear rather than abrasive wear or delamination dominating the wear process so that the improvement of the wear resistance of LCCI was achieved by hot working.
Carbon Fiber Reinforcing Frame Joint with Shear Failure of Core Area
Authors: Hu Jun , Yang Zhi Yong
Published: September 2013

Through the undamaged and damaged experimental study on frame joints strengthened with CFRP sheets, analyze and compare with two situations in stiffness, ductility, and energy consumption and etc. The results show that the carbon fiber reinforce damaged frame joint is mainly to change its damaged form, satisfied with strong joints, weak component of the design requirements, meanwhile it improves seismic behavior such as strength and stiffness degradation and energy dissipation.
Simulating the Effect of Current Pulse on Plasticity of the Pure Aluminum 1A99
Authors: Peng Shu Hua , Yang Jun Jie , Li Yao
Published: September 2013

In this paper, pure metals aluminum was used to study the effects of pulse current on their mechanical properties. The results showed that the pulse current caused the tensile strength of metals to decline remarkably. The elongation of metal rose and was enhanced with increasing current density. At the same time during the performance of plastic deformation, pulse current heating effect could change the mechanical property to some extent and can not be ignored.
Use of the Eigenstrain Concept for Residual Stress Analysis
Authors: Luzin Vladimir
Published: September 2013

Problems of residual stress analysis can be formulated in terms of so-called eigenstrain or inelastic strain. Although the concept is almost 100 year old, the use of it by the residual stress community is quite limited, due to complexities of the associated mathematics. When mathematical difficulties are resolved and eigenstrain is reconstructed, the use of it can be beneficial in several ways. Firstly, the eigenstrain is essentially a generator function for residual elastic stress and elastic strain and it can be used, for generation of any stress field in FE models. Furthermore, eigenstrain distributions are frequently localized, even though the elastic stress or strain distributions are not. Both these properties can be used for effective data reduction. Another advantage of the use of the eigenstrain concept is that experimental data may be interpreted in a more meaningful way by using a narrower context, in terms of plastic deformation, thermal expansion/misfit and deformation caused by phase transformation, rather than just residual stress/strain field. The sample geometry and symmetry play an important role in resolving eigenstrain distributions from residual stress and elastic strain fields. Generally the equations are difficult to solve, however for a sample geometry of high symmetry, eigenstrain can be resolved and expressed as a solution of a relatively simple integral equation; which is the Fredholm of the second type with the kernel of the integral operator defined by the sample geometry/symmetry. Several such symmetries are investigated, yielding analytical solutions that are applied and contrasted to experimental data. An important issue for residual stress analysis is the uniqueness of the solution is also discussed.