bluuebunny/crossref_metadata_2025 huggingface dataset:
Applying Case-Based Reasoning Approach to Assembly Part Design
Authors: Chang Guang Hsu
Published: September 2013

Experience and knowledge play a very important role in design; however, experts experience and knowledge are difficult to impart effectively and precisely to novices. Artificial intelligence (AI) approaches have been successfully applied to many fields. Among the numerous AI approaches, Case-Based Reasoning (CBR) is an approach that mainly focuses on the reuse of knowledge and experience. However, little work is done on applications of CBR to improve assembly part design. Similarity measures and the weight of different features are crucial in determining the accuracy of retrieving cases from the case base. This research presents a Case-Based Reasoning (CBR) system, CBR-DFA, consisting of a complete CBR cycle to retrieve and evaluate an assembly part design. Experience and knowledge in the form of suggestions include qualitative and quantitative information offered to novices by retrieving and adapting a similar case. Early experimental results indicate that the similar part design is effectively retrieved by these similarity measures.
Effect of Sintering Temperature on the Formability and Pore Closure Behavior of Al-SiC Composites
Authors: Bensam Raj J. , Marimuthu P. , Prabhakar M. , Anandhakrishnan V.
Published: September 2013

The objective of the present work is to study the effect of sintering temperature on the formability and pore closure behavior of the Al-SiC composites. Aluminium matrix composites reinforced by 10% and 20% SiC by weight were produced by powder metallurgy technique and sintered at 605°C in different time duration namely 90, 180 and 270 minutes. A complete cold upsetting test was performed on the as-sintered preforms to evaluate the effects of SiC addition and the sintering temperature on the forming behaviour of the Al-SiC composites. The formability stress index was evaluated and discussed in terms of geometric and matrix work-hardening. It was observed that the formability stress index reaches very high value for higher amount of SiC addition. Also with increasing sintering time the formability stress index increases due to a decreased pore size.
The Research of Method for Line of Sight Stabilization for Electro-Optical Tracking Equipment Based on the Integrated Navigation System
Authors: Qiao Tie Ying , Wang Min , Cai Li Hua
Published: September 2013

This paper studies the stabilization control method of based on the ship rocking information of navigation equipment, analyzes the self-stabilization model,puts forworad a ship rocking data filtering method based on the UKF,designs the LOS stabilization control system of a certain shipborne electro-optical equipment and analyzes the stabilization control system precision and isolation by the simulation method.
Engine Control of Power-Split Hybrid Vehicle
Authors: Wang Guang Ping , Wang Qing Nian , Wang Peng Yu , Wang Wen
Published: September 2013

Planetary power-split hybrid vehicle is a very common structure of hybrid electric vehicle (HEV), which achieves speed and torque double decoupled between engine and wheels. Engine always working on optimal curve is an important reason for low fuel-efficient. Engine speed is controlled by PID, and the optimal loading rate of engine is solved from engine characteristic curves; finally realization of engine working on optimal curve. Offline simulation is used for this algorithm, and comparing with many experimental results demonstrates engine works on operating point; fuel consumption is close to the official fuel consumption of Prius.
Dynamic Coordinate Control of Mode Switch for THS II
Authors: Wang Qing Nian , Wang Wen , Wang Peng Yu , Guo Ming Chen , Li Feng
Published: September 2013

THS II[1-3] is one of the most popular HEV configurations which has three power sources: an engine, an electric motor and a generator. When the engine is started, the dynamic response of engine will cause the vehicle to be power failure or great fluctuation. Therefore, in order to ensure good effect of vehicle dynamic coordination, it is necessary to use the electric motor's torque compensation principle to achieve dynamic coordination control of power sources, during the period of mode switch.
Model-Based Adaptive Sliding Mode Control Design for Magnetostrictive Actuator
Authors: Chang Guang Hui , Zhu Shi Jian , Lou Jing Jun
Published: September 2013

Giant magnetostrictive actuator (GMA) has been used in precise position, active vibration control etc. for its merits of large output force and displacement. At low drive level, GMA presents linear relation between displacement and input current, while nonlinear appears when applied moderate or high drive level. This paper addresses the development of model-based adaptive sliding mode control designs for GMA operating in nonlinear and hysteretic regimes. Homogenized energy model in combination with a quadratic moment rotation model for magnetostriction is adopted in this paper to describe hysteresis of GMA, and its inverse model is employed as a inverse filter before GMA system to compensate the hysteresis and nonlinear. The proposed control law guaranteed global stability of the control system with certain accuracy in tracking desired trajectories. Simulation result verified the correctness and effectiveness of the extracted control method.
Study on the Transfer Function Test Method for Electro-Optical Tracking Servo Control System
Authors: Cai Li Hua
Published: September 2013

The error of gain of servo control system transfer function is larger by the method of frequency measurement, In this paper, By appying voltage on the both ends of the motor, measure DC response of system to tmeasure the DC gain of control object.Experimental results show that the gain accuracy by the measurement method increases 2.5 times than the traditional measurement.
Design of Smart Hotel Lighting Control System Based on ARM
Authors: Guo Xiao Peng , Peng Xi Wei , Geng Qing Bo
Published: September 2013

The smart hotel lighting control system is the essential feature of every hotel in the future. In order to improve the performance of the system and make it easy to unified manage a large number of rooms, a design of smart hotel lighting control system based on ARM is put forward. The system uses STM32F107 which is an ARM chip based on the Cortex-M3 architecture as the main controller. The system can use switchs to control lighting, it also transplants LwIP protocol stack to achieve Ethernet remote management. This paper will make a detailed introduction of the system through both hardware and software aspects.
Design of a New Impedance Controller for a Time Delay Teleoperation System
Authors: Chang Young Won , Kostiyukova Olga , Chong Kil To
Published: September 2013

Bilateral teleoperation systems connected to computer networks such as the internet have to deal with varying time delays depending on several factors such as congestion, bandwidth, or distance. Such systems can easily become unstable due to irregular or varying time delays. A passivity concept has been used as the framework to solve the stability problem in bilateral control of teleoperation systems and we demonstrate in this paper how to recover both passivity and tracking performance using a novel control architecture that incorporates time varying gains into the transmission path, feedforward, and feedback position control. Simulation results for a single-degree of freedom master/ slave system are presented which demonstrates the performance of the resulting control architecture.
GSPN-Based Reliability Model of Wireless Control System
Authors: Xu Yi Xin , Bai Yan , Wang Ren Shu
Published: September 2013

It is difficult to model and solve the reliability of complicated dynamic system in the traditional reliability modeling method. A new reliability modeling method based on generalized stochastic petri net (GSPN) is proposed to analyze the wireless control system (WCS). After studying the common faults of the WCS, a dynamic fault tree is constructed to analyze the system, and it is transformed into formalization definition of GSPN. Finally, a certain type of WCS is selected to validate the proposed method. This method has important value to other WCS design and analysis.
DC/AC Converter Based on Buck Regulator
Authors: Chen Rong , Zhang Jia Sheng
Published: September 2013

The introduction of DC/AC converter based on buck regulator is firstly shown, and the analysis of the converters working principle is taken. The control method applied for DC/AC converter based on buck regulator is studied also. The control effect of the open-loop proportional-differential control and closed-loop proportional-integral control are compared by using PSIM software. The parameters adopted in the realistic simulation, waveforms such as voltage of modulation reference and load were given. The simulation results proved that adopting the DC/AC converter could achieve a good performance and can gain a line frequency as 50Hz and the correctness of theoretical analysis.
Nonlinear Dynamics of Peak-Current-Controlled Superbuck Converter
Authors: Bi Chuang , Xiang Yong , Zhang Qian , Lu Hua
Published: September 2013

Superbuck converter is a high-order converter, which has the unique advantage of the continuous input current, but increases the complexity of nonlinear phenomena of the system. This paper applies sample-data model to analyze the nonlinear dynamics of Superbuck converter with peak current control. The Jacobian matrix of the sample-data model is acquired to analyze the stability of the converter. On the other hand, the bifurcation analysis is carried out with the reference current as a bifurcation parameter based on the sample-data model. Several representative waveforms are captured from simulation, which verify the analytical results.
Effect of Oblique Misalignment in a 9GHz Open Coaxial Resonator
Authors: Xie Yong Chao , Liu Tong
Published: September 2013

The effect of inner-rod oblique misalignment in a 9-GHz open coaxial resonator is studied by means of the software CST microwave studio. Results show that the oblique eccentric between the inner rod and outer wall have substantial influences on the field profile, resonant frequency, and Q factors of an open coaxial resonator. And the oblique misalignment has more serious effect than the parallel misalignment. So in the practical of engineering applications, we should try to avoid the occurrence of eccentric between the inner rod and outer wall during to technological factors.
Modeling and Simulation of Doubly-Fed Wind Power Generators Based on PSCAD/EMTDC
Authors: Wang Le , Guan Lin , Fan Xin Ming
Published: September 2013

This paper builds the mathematical model of a doubly-fed wind power generator (DFIG) which is widely used in wind power generation. Based on stator magnetic field orientation vector technique, active and reactive power decoupling control strategy is constructed. Based on the software package PSCAD/EMTDC, the grid-connected system of DFIG is modeled, and the dynamic response characteristics of generators active and reactive power on ramp change of wind speed conditions is simulated and analyzed. The simulation results show that the variable pitch DFIG has good operating characteristics and the model is correct.
FPGA Implementation of Three Dimensional SVPWM
Authors: Rajagopal S. , Charles Sheba , Vedula Priyanka , Bharatiraja C. , Dash S.S.
Published: September 2013

In this paper includes an approach to implement Three Dimensional Space Vector Pulse width Modulation (3D-SVPWM) for multilevel inverter/Converter. The Proposed 3D-SVM scheme finds the reference vector by using simple mathematical equations for selecting switching states without redundant switching vectors. Moreover, the proposed PWM strategy satisfies the constraint that the output voltage vector should be only changed by one switching action. Not requiring extra hardware, the NPC inverter with the proposed PWM results are remarkable. The proposed algorithm is simulated by MATLAB and Implemented by FPGA-DSP Processor.
A Study on the Effect of SiC Reinforcement on the Surface and Tribological Behavior on Al-Metal Matrix Composites
Authors: Rameshkumar K.A. , Balamurugan K. , Gnanaraj D. , Ilangovan S.
Published: September 2013

Al matrix composites (Al-MMC) were reinforced with SiC and flyash particulate. The effects on the variation of SiC (5 %, 10 % and 15 %) were investigated by dry sliding method, whereas the flyash content was maintained at 14 %. Effect on the SiC on the mechanical and tribology was discussed in detail. Friction wear properties SiC reinforced was investigated. Coefficient of friction was estimated and is discussed for the various SiC compositions. Powder X-ray diffraction (XRD) was carried out to identify the homogeneous formation of the composites. Surface morphology was investigated by the use of optical microscope and scanning electron microscopic probe. Hardness of the prepared samples was subjected to Vickers microhardness test.
Improvement of Two-Phase Flow Distribution in Compact Heat Exchangers by Using Ultrasound
Authors: Tingaud Florian , Ferrouillat Sébastien , Colasson Stéphane , Bulliard-Sauret Odin , Bontemps André
Published: September 2013

In this communication we present a new active method to modify two-phase flow distribution in a heat exchanger, when it is in operation, by using ultrasound generators which can be activated when necessary. An experimental study has been carried out to validate the concept and to evaluate the effects of ultrasound on the flow distribution. An experimental test rig was built to measure the flow distribution in realistic manifold and parallel channel geometry. The test section is composed of a manifold feeding 10 channels with air-water mixture. In front of each channel a piezoelectric generator is placed to emit ultrasonic waves which can interact with liquid flows. Comparison was made between two-phase flows with and without ultrasound. It was demonstrated that, in most cases, uneven distribution was improved by using ultrasound.
The Application of Shunt Capacitor in Short-Circuit Test System of Transformer under Variable Frequency Power Supply
Authors: Wang Li Di , Zhang Yue , Han Chun Cheng , Li Zhe
Published: September 2013

The short-circuit test is an important topic on the study of transformer features. With the shunt capacitor paralleled to the tested transformer, the test current can be reduced by the resonant of the capacitor and the inductance of transformer winding. Furthermore, using the high frequency power supply, the capacitor can be reduced in the resonant point because the high frequency values. In this work, the simulation model of short-circuit test of transformer with different frequency power supply is designed. Under variable frequency power supply, which are 50Hz,100Hz and 150Hz, the shunt capacitors value is given. From the simulation results, the application of the shunt capacitor takes a role in the short-circuit test of transformer. This has a significance role in transformer test research and engineering application field.
A Hardware-in-the-Loop Platform for a Typical Construction Machinery Real-Time Test
Authors: Gong Wen , Yu Zhong Jian
Published: September 2013

In order to supply a reliable and low-cost method for construction machinery real-time test, take a hydraulic excavator for example. Especially for testing controllers and evaluating the performance of strategies, a hardware-in-the loop platform has been developed based on the xPC real-time system. The hardware-in-the-loop system, including dynamic model of the excavator and an 3D real-time display subsystem, is presented in this paper. The simulation results are also described at the end of the paper.
Application of Extreme Learning Machine in Transient Stability Assessment of Power Systems
Authors: Li Yang , Gu Xue Ping
Published: September 2013

This paper presents a new method for transient stability assessment (TSA) of power systems using kernel fuzzy rough sets and extreme learning machine (ELM). Considering the possible real-time information provided by phasor measurement units, a group of system-level classification features were firstly extracted from the power system operation condition to construct the original feature set. Then kernelized fuzzy rough sets were used to reduce the dimension of input space, and ELM was employed to build a TSA model. The effectiveness of the proposed method is validated by the simulation results on the New England 39-bus test system.
Soft-Switch Technology Application of Electric Power Communication Network
Authors: Zhang Jun Liu , Tang Hong , Wang Gang , Feng Shao Hui , Xiong Li Juan , Li Qiang
Published: September 2013

In China, more and more power communication network soft-switch transformation is proposed. In this context, the article analyzes the principle of the introduction of the soft-switch technology. Detailed design methods and strategies for the introduction of soft-switch technology. and compare these rehabilitation programs. Analysis application of soft-switch in Huizhou and Xianning.
Research on China's First Residential Grid-Connected Photovoltaic System
Authors: Dai Yan Jie , Sun Chun Yan , Wang Xiao Yong , Yang Wei Hua
Published: September 2013

Along with the continuous expansion of photovoltaic (PV) power generation, different capacity of grid connected PV system is gradually increased. China's first residential grid-connected PV system has interconnected successfully in QingDao and operated normally. This document analyzed electrical connected diagram of grid-connected PV system. Using power quality analyzer, the online power quality is monitored and analyzed. When PV power generation is low efficiency of operating state, harmonic current is over distortion limits. Monitoring data was simulated through electrical power standard source. To ensure power metering accuracy under harmonic, the watt-second method is proposed. Testing results show that smart electrical meter can meter accurately within 20 times harmonics.
Research on Optimal Control in Hybrid Energy Storage Systems
Authors: Lu Yun , Zhao Yong Lai
Published: September 2013

The control strategy of energy storage system will have a direct impact on their economic performance and technical performance. Based on the complementary functional for the Super-capacitors and Batteries composed of hybrid energy storage system . Established energy storage system mathematical model by the state average method, which uses fuzzy adaptive PID and conventional PID control method to control and simulation the output power of energy storage device, voltage loop and current loop of the energy storage system, and comparative analysis it. The results show that fuzzy adaptive PID control system has a better dynamic response performance and stability.
Improvement of Piezoelectric Property of Poly(Vinylidene Fluoride) Nanocomposites Using Multi-Walled Carbon Nanotubes
Authors: Hu Bin , Wu Liang Ke , Ning Hui Ming , Hu Ning
Published: September 2013

We improved the piezoelectric property of poly (vinylidene fluoride) (PVDF) by employing multi-walled carbon nanotube (MWCNT) as nanofillers. The MWCNT/PVDF nanocomposite was prepared by the solution casting method with MWCNT contents ranging from 0.0 wt.% to 0.3 wt.%. To induce the piezoelectric β-phase crystal structure, the nanocomposite films were drawn lengthwise with a ratio of 4 ~ 5 and polarized by step-wise poling method. To evaluate the piezoelectric property, the output voltages of the nanocomposite films were measured through extensive experimental vibration tests. The experimental results show that the nanocomposite films with 0.05 wt.% MWCNT possess the highest output voltage, i.e., around 2 times as that of pure PVDF films. The main reason is that more β-crystalline phase can be formed at this content, as confirmed by X-ray diffraction.
A New Smart Substation Structure with Single Net and Single Equipment
Authors: Qin Li Jun , Guo Ning Hui
Published: September 2013

a new generation of single equipment and single network structure of intelligent substation is proposed in this paper on the basis of the current three layers two network smart substation, the key technology of this kind of new intelligent substation needs are also proposed in this paper, such as port mirroring, VLANs and IEEE1588. Examples of key technologies are presented,using industrial Ethernet switch, providing reference for engineering applications of new smart substation .
Evaluate Pumped-Storage Unit in Power System with Multi-Type Units
Authors: Wang Xiao Hui , Zhang Li Zi , Sun Zhuo Xin , Cheng Shi Jun
Published: September 2013

This paper proposed an approach to evaluate the economics of pumped-storage unit from the perspective of the power system. An MIP-based unit commitment model with multi-type units was established, which integrated thermal, CCGT, hydro, wind, nuclear and pumped-storage units. Based on the model the net present value of pumped-storage per megawatt was calculated and compared with the capital cost per megawatt, which produce the economic result of pumped-storage. The case study proved the feasibility of the above model and approach. Furthermore, the change of economic result of pumped-storage over system variables like nuclear capacity, wind capacity and regulating capacity of thermal unit was analyzed. The case study showed that with the increase of nuclear capacity, wind capacity and minimum output of thermal units, the economics of pumped-storage was improved.
Comparative Study of the Units Serial and Parallel Recovery Strategy after Blackout
Authors: Zhao Wei Xing , Ma Tan Feng , Tian Lian Jie , Wang Ping , Qiu Xiao Yan , Liu Nian , Cui Wei
Published: September 2013

After the regional blackout, the power system is to find stable black start power units since the launch of the grid as soon as possible to restore, while in select the start unit enforcement serial recovery or parallel recovery, there is no specific guidance method until the present. In this paper, comparative study the serial recovery strategy which concern to optimize the period of time the unit power generation for the target and parallel recovery strategy for first divide power system into several subsystems, then this subsystems start at the same time. Finally, the 10-machine 39-bus system is used to illustrate these recovery methods.
Optimal Design of Passive Filter Groups Based on Three Kinds of Operation Modes
Authors: Wang Kai Liang , Zeng Jiang
Published: September 2013

Parameters of passive filter (PF) group are usually designed according to single operating mode, in general the maximum operation mode. When power system is being operated in other operation mode, it is impossible to meet the requirement of power system in reactive power compensation and harmonic elimination simultaneously when whichever filter group is out of service. For this reason, based on three kinds of typical operation mode, namely the maximum, average and minimum mode, the optimization design of PF group is performed and reasonable parameters are determined to achieve the optimal matching between harmonic elimination and reactive power compensation by the lowest investment cost. The feasibility of the proposed method is verified by simulation results.
Design and Implementation of the Medium and Long-Term Time Scale System Frequency Fluctuations Simulation Platform
Authors: Yu Ting , Jin Zhao Yu , Sun Ying Yun , Lin Jing Huai , Pu Tian Jiao
Published: September 2013

Large-scale wind power integrates in the grid to provide clean energy; however, it has a negative impact on the stable operation of the grid. To analysis the effect of wind power on frequency control, we need the help of simulation software. But, there has no frequency control mathematical model of wind farm in simulation software available for the user to choose. So this paper designs and establishes a frequency simulation platform, which provides the frequency control mathematical model of wind farms, hydroelectric power plants and thermal power plants. It can not only evaluate the impact of wind power fluctuations on frequency control, but also can quantitatively analysis of the system reserve capacity, as well as AGC performance monitoring function.
Computing the Singular Solution of Power Flow System
Authors: Ji Zhen Yi , Wu Wen Yuan , Li Yi , Feng Yong
Published: September 2013

The purpose of this paper is to compute the singular solution of the nonlinear equations arising in power flow system. Based on the approximate null space of the Jacobian matrix, more equations are introduced to the origin system. Meanwhile, the Jacobian matrix of augmented equations at initial value is full rank, then the algorithm recovers quadratic convergence of Newtons iteration. The algorithm in this paper leads to higher accuracy of the singular solution and less iteration steps. In addition, two power flow systems are studied in this paper and the results show this new method has high accuracy and efficiency compared with traditional Newton iteration
Research on Grey Prediction of Electromagnetic Relay Contact Resistance
Authors: Yang Xiao Jing , Yao Fang , Li Zhi Gang , Feng Xue Bo
Published: September 2013

When the relay contacts are switched on the load circuit, contact pairs on-state directly reflects the relays reliability, and it also indirectly reflects machine performance of the relay. Therefore, the static contact resistance is one of the key features of the relays state estimation and failure warning. However, the contact resistance of the relay contact is uncertainty characteristics, small-scale sequence trend model is difficult to obtain an ideal prediction performance, and therefore grey model which based on small-scale sequence for prediction of electrical contact reliability of the relay is drawn on. Using the static contact resistance measurement value of the relay contact resistance as training samples to set up GM (1, 1) model and obtaining development grey numberaand endogenous control grey numberbby least square method, so as to get differential equation of original datas predicted value and then forecast the original data. In order to improve the prediction accuracy and weaken the influence of randomness, sliding smoothing formula to the original data is used to get improved prediction model. By comparing the difference between the accuracy of improved model and not improved model, it concludes that the improved model has possibility and accuracy higher.
Statistic Inference for Inertial Instrumentation Error Model Using Bayesian Network
Authors: Hu Zheng Dong , Zhang Liu Xin , Zhou Fei Yue , Li Zhi Jun
Published: September 2013

For the parameter estimation problem of inertial instrumentation error models, a Bayesian network is founded to fuse the calibration data and make error coefficients statistical inference in this paper. First the fundamental of Bayesian network is stated and then how to establish network for a typical case of inertial instrumentation error coefficients estimation is illustrated. Since the difficult high-dimension integral calculus for model parameter can be avoidable, WinBUGS software based on MCMC method is used for calculation and inference. The simulated results show that using Bayesian network to make statistical inference for inertial instrumentation error model is reasonable and effective.
Maximization of the Signal Impulsiveness Combining Envelope Technique with Minimum Entropy Deconvolution
Authors: de Oliveira Rafael José Gomes , Mathias Mauro Hugo
Published: September 2013

The application of the HFRT (High-Frequency Resonance Technique), a demodulation based technique, is a technique for evaluation the condition of bearings and other components in rotating machinery. Another technique MED (Minimum Entropy Deconvolution) has been the subject of recent developments for application in condition monitoring of gear trains and roller bearings. This article demonstrates the effectiveness of the combined application of the MED technique with HFRT in order to enhance the capacity of HFRT to identify the characteristic fault frequencies of damaged bearings by increasing the signal impulsivity. All tests were done using data collected from an experimental test bench in laboratory. The Kurtosis value is used as an indicator of effectiveness of the combined technique and the results shown an increase of five times the original kurtosis value with the application of MED filter together with the HFRT.
A Study on the Characteristics of a Vibrator Using Flat PCB-Coil
Authors: Kim Hyung Sik , Hong Sang Pyo , Choi Mi Hyun , Kim Hyun Joo , Lee In Hwa , You Na Rae , Yi Jeong Han , Chung Soon Cheol
Published: September 2013

In this study, we developed and evaluateda vibrator using a flat PCB-coil. The flat PCB-coil vibrator was fabricated on a printed circuit board using and etching process. The spiral pattern was etched on a fiberglass cloth with an epoxy resin. To evaluatethe flat PCB-coil vibrator, we generated a sine wave, saw-tooth, and square wave through a custom made wave generator and amplified the waveforms using a power amplifier. A three-axis accelerometer was used to evaluate the performance of the developed vibrator. Even though the developed vibrator is simple, it has a wide range of vibration frequency (50~500 Hz) and vibration amplitude (0~5 V). The vibration amplitude does not change due to frequency change. It is expected that the developed vibrator can be used in a wide variety of applications such as in a tactile stimulator, in elastography, energy harvesting, and in a cooling system.
The Design of Digital and Multi-Function Watt-Hour Meter
Authors: Fu Li Hui , Dai Jun Feng , Li Hua
Published: September 2013

In this paper, a multi-function watt-hour meter which has the function of time-sharing charging, remote meter reading and IC pre-payment is put forward.ADE7755 is the heart of measurement circuit which can sample the voltage and current of the usercircuit,calculate the instantaneous power,real time clock chip DS1302 in the system which can provide accurate standard of time for time-sharing charging, the nonvolatile memory AT24C04 is used to store the electric power bill information and other working parameters, the infrared communication interface is used remote meter reading. The whole watt-hour meter is a pure electronic measuring instrument without any mechanical part, it is working reliably, simple and flexible in use.
The Transformer Tangled Winding Joints Open Welding Diagnostic Methods
Authors: Zhang Yun Shan , Wang Qing Hao , Zhao Chuan Zong , Wang Yi , Bai Jia Tian
Published: September 2013

Through analysis of 66KV, 31500 KVA transformer tangled winding connector open welding faults, the coordination of Oil chromatographic analysis and electrical test can be used to find the defect and the location. It clarified the tangled windings of the transformer joint diagnosis of full open welding process in detail, and pointed out the direction for the future to find and the troubleshooting.
A Harmonic Detecting Scheme Based on BP Neural Network
Authors: Liu Yun Yun , Zeng Jiang , Wang Kai Liang
Published: September 2013

General harmonic detecting scheme is using the Fast Fourier Transform (FFT) for detection of all the harmonics (such as 1 to 50 times). While power units often do not care about the specific values of all the harmonics, but is only concerned with some key harmonics or several overall indicators. For the above reason, a new harmonic detecting scheme based on the algorithm of BP neural network is presented in this paper. It does not need to calculate all the harmonics, when the detection of individual indicators or overall indicators which are concerned by users can be achieved,and to achieve the above-mentioned detection target, by the analysis of computation of BP, DFT and FFT algorithm, the superiority of the scheme in terms of computation is proved. After the simulation of the scheme using a set of measured harmonic data, the results validate that the above scheme is simple and feasible, and its detecting accuracy is close to which of FFT.
The Simultaneous Acquisition of the Mixed Vehicle-Carrying Signals Based on the CompactRIO
Authors: Zhang Yun Lei , Xing Wu , Pan Nan , Wang Xu
Published: September 2013

In order to realize a simultaneous acquisition of the mixed vehicle-carrying signals, this paper put forwards a new acquisition system that synchronous controls the digital IO module, the vibration-and-noise module, the electrical pressure module, the temperature-measuring module, as well as the CAN module, under the mode of FPGA, which is based on the embedded platform CompacRIO, and it could also be controlled by both PC and PDA. The operating procedures of this system are highly reliable and compatible, specifically designed to be people-oriented. This paper gives a full introductions to how the multi-mixed signals are simultaneously collected, the deepening of the FIFO on FPGA, and how it could be controlled by PDA. Finally, the efficiency and stability of the system would be proved through the practical pressure tests of data-acquisition.
Research the Measurement Method of Software Aging in Cloud
Authors: Liu Fang , Cao Jing , Guo Jun , Zhang Bin
Published: September 2013

Although SaaS is a new application model, the phenomenon of software aging still exists, which will cause service performance decline ceaselessly, even worse, service failure. In order to ensure SaaS performance, we need to estimate the degree of software aging accurately, so as to provide a basis to the resource allocation strategy. In this paper we describe the process of calculating software aging degree, and build a performance metrics system according to gray correlation degree analysis, then calculate SaaS software aging degree based on fuzzy evaluation. Finally, we verify the effectiveness of our measurement method of software aging in cloud by experiments.
Development of a Manual Metal Arc Welding Flux from Local Raw Materials in Nigeria
Authors: Adekunle Oyawale Festus , Oyakhobo Odior Andrew , Akii Ibhadode
Published: September 2013

It is generally believed that raw materials for the manufacture of welding electrodes are not available in Nigeria. As a result, completely manufactured electrodes are imported and where they are produced locally, all the components are imported from the home countries of the technical partners. The aim of this research therefore is to produce a welding flux formulation from local materials. Various minerals were beneficiated, pulverized and mixed in various ratios using sodium silicate as binder. The welding flux developed yielded results comparable with ISO2560: E432R11
Application of Multi-Sensors Data Fusion Technology in the Theodolite Tracking System
Authors: Ge Bing , Yu Yi
Published: September 2013

The task of multi-sensors data fusion technology is to obtain more precise estimate of object state and light path than single sensor through dealing with the information from different sensors. The paper puts forward the ideal of applying the data fusion theory to O-E theodolite system, based on the data fusion theory and Kalman filter and estimate theory. At the condition of losing and covering object, the theodolite tracks object normally. The theory of multi-sensors data fusion is validated improving acquiring and tracking ability of the theodolite effectively in practice.
Boundary Points De-Noising and Simplification Based on Spatial Connectivity
Authors: Zhu Wei , Di Fang , Li Jian Li , Tian Li
Published: September 2013

A de-noising and simplification approach based on spatial connectivity is proposed which is applied to deal with the boundary points of point cloud. First, grid method is used to represent the spatial topology relationship of the scattered point cloud and calculate the k-nearest neighbors for each data point. Then boundary points are extracted according to uniform distribution of point cloud. And next, an algorithm for boundary points simplification of point cloud is presented to further simplify boundary points. Consequently, not only the details characteristics are reserved well, but also the boundary points are simplified. The experimental result shows that the proposed approach can not only reserve characteristics of both details and boundaries but also realize de-noising and simplification of point cloud.
Design of an Efficient Combined Unsigned and 2’s Complement Squarer
Authors: Cho Kyung Ju , Chung Jin Gyun
Published: September 2013

Squaring is an important operation in many algorithms. In this paper, an efficient design approach for the combined squarer, capable of operating on either unsigned or twos complement numbers based on a mode selection signal, is presented. By simulations, it is shown that the proposed combined squarers lead to up to 17% reduction in area, 10% reduction in propagation delay and 9% reduction in power consumption compared with the previous combined squarers.
Rough Set and K-Means Clustering Algorithm Based on Ant Colony Algorithm
Authors: Meng Ying , Luo Ke , Liu Jian Hua
Published: September 2013

Traditional K-means clustering methods have great attachment to the selection of the initial value and easily get into the local extreme value. This paper proposes a synthetic clustering algorithm of rough set and K-means based on Ant colony algorithm. While the rough set theory presents processing method of uncertain boundary objects, Ant colony algorithm is a bionic optimization algorithm, which has strong robustness, easily with other method unifies, solving efficiency higher characteristic.. Therefore, the K-means algorithm based on Ant colony algorithm in this paper combines rough set theory with simulated annealing algorithm and K-means, in which K means cluster number and initial cluster centers can be obtained dynamically with the principle of maximum minimum, and processing boundary objects with upper and lower approximation of rough set theory. Finally, the UCIs Iris set is used to test the algorithm. The experimental results show that the algorithm has higher accuracy rate, faster execution time and more stable performance.
Adaptive Approach to Make a Delayed Complex Network Attain an Inhomogeneous Equilibrium Point
Authors: Qin Bu Zhi , Lu Xin Biao
Published: September 2013

The inhomogeneous equilibrium point of a delayed complex network is investigated. In this letter, a novel local adaptive approach is used to make the delayed network achieve an inhomogeneous equilibrium point, where the whole nodes are divided into several groups; the nodes in the same group achieve one equilibrium point. The coupling strength between nodes varies with the information of the related nodes. By constructing a Lyapunov function, a sufficient condition about the stability of the inhomogeneous equilibrium point is obtained. When the isolated node is chaotic Lorenz system, simulations verify the effectiveness of the strategy.
A Novel Compressive Detector for Impulse UWB Systems
Authors: Zhang Zi Kai , Wang De Qiang , Li Guo Zhu , Li Zhi Yong
Published: September 2013

Recently, compressive sampling (CS) based detector schemes for impulse ultra-wideband (I-UWB) systems have been proposed to bypass the difficulty of Nyquist sampling. These schemes suffer from either low energy capture or implementation complexity. In this paper, we propose a new compressive detector for I-UWB, where the measurement matrix is redesigned to boost the energy capture and meanwhile reduce the implementation complexity. Simulation results show that satisfactory performance can be achieved by using the newly proposed scheme.
An Improved Montgomery Window Algorithm on Modular Exponentiation Secure against Side Channel Attacks
Authors: Han Mu , Zhao Jia , Ma Shi Dian
Published: September 2013

As one of the core algorithms in most public key cryptography, modular exponentiation has a flaw of its efficiency, which often uses the Montgomerys algorithm to realize the fast operation. But the Montgomerys algorithm has the issue of side channel leakage from the final conditional subtraction. Aiming at this problem, this paper presents an improved fast Montgomery window algorithm. The new algorithm generates the remainder table with odd power to reduce the amount of pre-computation, and combines with the improved Montgomerys algorithm to realize modular exponentiation, which can accelerate the speed and reduce the side channel leakage. The new algorithm cant only thwart side channel attacks, but also improve the efficiency.
An Adaptive TDMA Slot Assignment Algorithm for Scalable Wireless Mesh Networks
Authors: Jia Gu , Wang Yu Wen , Meng Fan Ji , Ye Guo Hua , Wang Guo Lin
Published: September 2013

The media access control (MAC) protocol based on fixed slot allocation has low throughput and high delay in high load wireless mesh network. In order to improve the performance of wireless mesh network, we propose a scalable adaptive time division multiple access (TDMA) slot allocation algorithm based on the existing fixed TDMA. The algorithm uses the network structure of clustering and builds a more optimized frame structure, cluster head dynamically allocates time slot according to the packet number of the cluster member sent and the priority level, at the same time taking into account the situation of nodes joining and leaving to improve the scalability of the network The simulation results on OPNET network simulation platform show that the algorithm is superior to fixed TDMA algorithm in both throughput and delay.
Research on Deformation Mechanism of Surrounding Rock during Excavation of Large-Span Shallow-Buried Double-Arch Tunnel
Authors: Sun Shao Rui , Lu Ye Xu , Zhang Shao Hua , Wu Ji Min
Published: September 2013

The deformation mechanism of surrounding rock during excavation is difficult to stability evaluation for large-span shallow-buried double-arch tunnel. Take Fenghuang mountain tunnel in Suzhou city as an example, the main work and funding are as follow: The measured data in the middle of the tunnel, including settlement on the top of the tunnel and deformation between two lateral walls, were used to calculate mechanical parameters by back analysis method. The obtained parameters were used to calculate the deformation and stress of the main tunnel excavation in the different steps. The rules includes time-space effect during main tunnel excavation, force mechanism of the middle wall and settlement on the ground surface for the surrounding rock in the main tunnel. Finally, the calculated settlement and deformation were compared to the monitoring results. The safety coefficient of surrounding rock for double-arch tunnel was obtained by strength reduction theory.
Influence of the Dispensation of Transfer Bar to the Load Coefficient at Concrete Pavement Seam
Authors: Zhao Fang Ran , Li Ye Ming
Published: September 2013

The airport cement concrete pavement seam is very important to the bearing capacity and Flatness. Considering the importance of seams, a detailed three-dimensional finite element model was used to investigate the state of seams. According the calculation method of load transfer coefficient, the coefficient was obtained. Comparing the different coefficient, the best position of dowel steels, the best diameter of dowel steels, the best buried depth of dowel steels and the best joint width of dowel steels all can be gained best joint width of dowel steels all can be gained.
Design of Aerodynamic Model for Unique Arch Bridge
Authors: Cheng Shou Shan , Huang Hai Xin , Zhang Ying , Qie Yan Hui
Published: September 2013

The model test is an effective means to verify the mechanical performance of the bridge structure and to ensure the structural safety. The accuracy of design and manufacture is the key of model test.For a arch ridge with curved beam and skewed arch, the model test based on the similarity theory is analysized in detail including selecting materials, designing the size of section and calculating the geometrical parameters and so on, and the simulation reults between model and prototype are evaluated.Meanwhile some key technologies and valuable matters for design of aerodynamic model are presented,which provides an important reference value for model design of bridge structures.
Resource Allocation Problem Based on Weighted Cross-Efficiency and Production Capacity
Authors: Cui Yu Quan , Lu Xi , Li Lin Lin
Published: September 2013

In economic development, resource has become increasingly important and the problem of how to allocate resource reasonably has become a hot issue..This paper proposes a new resource allocation mode based on DEA models taking into account production efficiency, input-output elasticity, potential production capacity. We put forwards a new weighted cross-efficiency calculation formula and a new resource allocation weights calculation formula. From the numerical example, the result is satisfactory.
Green/Sustainable Manufacturing — Evaluation of a Soybean-Based Metal Cutting Fluid in Turning Operation
Authors: Zhang Ju Lie , Rao P.N.
Published: September 2013

Green manufacturing is a method in which products are produced by consuming less energy and natural resources and being safe to employees, consumers, environment and society. This paper presents an experimental study that compares the machining characteristics when a soy-based cutting fluid and petroleum-based alternate are used in turning medium and high carbon alloy steels. The result of the study will provide reference for cutting fluid management personnel to make proper decision to substitute traditional cutting fluids with the environment-friendly product.
Analysis on the Environment Risk of the Resource Exhausted Mining Cities
Authors: Zhao Xiao Zhi
Published: September 2013

Due to the objective orientation and background, the development of mining cities has different characteristics compared with the other cities. The mining cities all will face the problems such as resource exhaustion, industry transformation and environment recovery, etc. Through the analysis of a typical example, its realized that many resource exhausted mining cities in our country have great environmental risks such as air pollution, water resource damage, earth degeneration and geological disasters. Scientific and effective measures should be taken to avoid the environmental risk and promote the sustainable development of the resource exhausted mining cities.
Factor Analysis of Liangshuijing Landslide Deformation
Authors: Wu Yi Ping , Ou Guang Zhao , Wang Zhen Shuai
Published: September 2013

The evolution of landslide displacement is affected by many factors. Therefore, it has great significance to find out the factors which play the main role for the landslide dynamic evolution and inducing mechanism. This paper takes Liangshuijing Landslide as an example, combining with the displacement monitoring data, and selects the rainfall of current month, cumulative rainfall of anterior two months, monthly maximum reservoir water level and the monthly average reservoir water level as influencing factors. According to factor analysis, two main factors and rotated component matrix are extracted. And the main influencing factors for the landslide displacement of every year are found. With the comprehensive analysis of the factor loadings in the four factors, we can get the influencing degree order for Liangshuijing Landslide displacement evolution as follows: cumulative rainfall of anterior two months> rainfall of current month> the average reservoir level of current month>reservoir level fluctuation of current month.
Air Quality Monitoring System Based on ZigBeeCC2530
Authors: Chang Bo , Zhang Xin Rong , Zhou Lei , Li Li Hong
Published: September 2013

Aiming at the actual demand of the indoor air quality safety monitoring, an air quality monitoring system was designed based on low-power ZigBee wireless communication technology and micro-controller chip CC2530. By deploying sensor network nodes in monitoring area, the monitoring information, that is, CO, formalin, SO2and benzene, are collected in real time and aggregated to the central monitoring system in order to achieve a unified data management and network routing monitoring functions. The central monitoring computer stores and displays the data sent by ZigBee network, thus achieves real-time monitoring of changes in indoor environmental parameters. The monitoring results have shown that this system is stable, high reliable in data transmission and easy to use, and can be applied to the automatic monitoring of environmental parameters in other areas by slight transformation.