bluuebunny/crossref_metadata_2025 huggingface dataset:
Surface Crack Detection in Building Wall Based on Computer Vision
Authors: Fan Jin Zhi
Published: October 2014

the detection technology of surface crack in building wall is studied to improve the accuracy of detection. To detect surface crack in the building wall, there will be a pixel overlap or distorted in the location of image connection if using traditional detection method to make fusion process for the different pixels. due to the accuracy requirements of image pixels in surface crack detection in building wall is relatively high, resulting in too low accuracy rate of surface crack detection in building wall. In order to avoid the above problem, a detection method for surface crack in building wall based on computer vision is proposed. The crack region’s pixel in the image of building wall’s surface is calculated, and thus to provide the basis for surface crack detection in building wall. According to the theory of computer vision, the spatial location of the surface crack region in building wall is obtained. Experiments show that this detection system can improve the accuracy of detection, and achieve satisfactory results.
The Calibration Method of Thermal Heat Flux Sensor Based on Wireless Sensor Networks
Authors: Zheng Xiao Shi , Cheng Guang He , Meng Qing Long , Hao Feng Qi , Xu Xuan Cai , Yang Yu Zhong , Wang Zheng Wei , Tang Ping
Published: October 2014

This paper analyzed the advantages and disadvantages of existing heat flux sensor calibration methods, proposed a calibration method of thermal heat flux sensor based on wireless sensor networks. Experimental results showed that the detection error was reduced from 6% to 2% after calibration. The proposed method has many advantages, such as short calibration time, accurate results, easy installation as well as batching calibration. In a word, this method is available to calibrate heat flux sensors and will have an important significance for accurate measurement of heat flux.
The Research on Fuzzy Clustering Method Based on Differential Evolution Algorithm in Intrusion Detection
Authors: Yang Qi Fan , Wang Li Na
Published: October 2014

Fuzzy C-means clustering algorithm (FCM) is widely applied to the intrusion detection. To acquire a better division for intrusion data, a new method (DEFCM) presented in the paper which combines FCM and differential evolution algorithm (DE) is found application. As a start, several randomly initiated partitions are optimized by FCM, and then the result is provided to differential evolution algorithm. After that, the combined result is sent to FCM again to adjust the partition and obtain the final answer. The method can improve detection performance effectively. The KDDCUP1999 data set is used in the simulation experiment, and the result proves that the DEFCM algorithm has a comparatively high detection rate in intrusion detection.
Vehicle Tracking Based on Fuzzy C-Means Clustering and Grey Model
Authors: Yang Dong He
Published: October 2014

To detect the moving vehicles correctly, we proposed a vehicle tracking method based on background model, fuzzy C-Means clustering and Grey model. In this paper, the background image is updated adaptively to accommodate vehicle detection in variable outer environment. The Grey model is employed to predict the center and number of C-Means clustering, solving the dependency of fuzzy C-Means upon clustering center of initial frame. The result of clustering provides updated data of Grey model for the position of target in the next frame. The experimental results show that, the method proposed improves both of the speed and accuracy of C-Means clustering, and promote the robustness and real-time of vehicle tracking system.
Performances of Proton Exchange Membranes from Sulfonated Polyetheretherketone and Inorganic Compound Blends
Authors: Ma Jun , Su Dong Yun , Jiang Min , Ni Hong Jun , Huang Ming Yu , Wang Xing Xing
Published: October 2014

A variety of modification approaches such as cross-linking and blending have been explored to prepare efficient membranes based on SPEEK. The addition of inorganic filler is also one of the most widely used approaches to modify the SPEEK because inorganic additives can withstand relatively higher temperatures than virgin polymer. Different inorganic fillers are used to alter the properties of neat polymer.
A Novel Vehicle Speed Control Based on Driver’s Vigilance Detection Using EEG and Sparse Representation
Authors: Luo Dian Yuan , Zhang Zu Tao
Published: October 2014

Drowsy driving is deemed to be an important factor in many traffic accidents. Current vigilance detection systems are usually based on the expression of the driver recorded in video. These existing systems can only warning the driver when they are in fatigue and video-based analysis can’t detect the driver’s Pseudo-fatigue. In this paper, we propose a novel vehicle speed control based on driver’s vigilance detection using electroencephalographic (EEG) and Sparse representation. The proposed system consists of the vigilance detection module and the vehicle speed control module. In vigilance detection module, preprocessing and sparse representation classification (SRC), the classification of driver’s vigilance, are implemented in EEG to get the vigilance degree of driver. In vehicle speed control module, the Electronic Control Unit (ECU) control the electronic throttle and Anti-lock Brake System (ABS) so as to make vehicle speed keeping at the original level or down to zero according to the signal of vigilance degree. The last performance evaluation demonstrates the validity of the proposed vehicle speed control based on driver’s vigilance.
Accuracy Measurement and Error Compensation of Three-Axis CNC Milling Machine
Authors: Chen Jin Ying
Published: October 2014

Through the methods using combination ball-bar with laser interferometer, we carry on accuracy measurement and error compensation of three-axis CNC milling machine. We finally find out the main factors affecting the machining accuracy of machine tool. In the meantime we can improve repeatability of positioning accuracy and the machine's positioning and meet the processing needs by means of the existing error compensation of the CNC machine tools.
Analysis and Simulation of Dynamic Characteristics of Helical Gears
Authors: Zhu Lin Long
Published: October 2014

To solve noise and vibration problem and other problems of helical gears, to improve its reliability and safety, this paper uses transmission of helical gear as the research object and makes an analysis of dynamic characteristics of time-varying contact wire and time-varying friction after giving the length of the contact wire, time-varying friction and fast Algorithm for the friction torque. The results of experiment show that the fluctuations of time-varying contact wire is an important cause of tooth surface friction and tooth surface friction torque fluctuations. Time-varying contact wire length, tooth surface friction and friction torque fluctuations are smallest at twenty centigrade degrees, which provide a theoretical basis for the parameter design of gears and engineering optimization.
Application of ANFIS in Engine Fault Prediction
Authors: Zhang Hong Bin , Huang Yan Fang , Sun Shi Xia , Zhao Yang
Published: October 2014

Application of Adaptive Neuro-Fuzzy Inference System (ANFIS) in engine fault prediction is introduced in this paper. For insuring the engine safety and reliability, the fault of engine must be predicted, and the fault can be terminated in time. So, the fault prediction theory and the method of ANFIS are studied. The fault prediction sets, the structure and parameters for ANFIS are given in the course of fault prediction. It has made very pleased result through experiment of certain type engine fault prediction, and it is important to engine maintenance. The application of ANFIS has a good reference to engine fault prediction researching.
Design of Distributed Control System of Liquid Fermentation Based on S7-300 PLC and WinCC
Authors: Zhang Wei , Li Xuan , Yang Fang , Wang Jiao Jiao
Published: October 2014

In order to improve the automation level for the control system of liquid fermentation of a company in Hubei province, and combine with the requirements of the company, a distributed control system of liquid fermentation is designed. The control system is composed of host computer based on WinCC, and the slave computer is S7-300 PLC of SIEMENS. The fermentation parameters, including rotation speed, temperature, pH, DO, O2, CO2, can be real-time online collected, and realize the frequency control of motor and precise control of temperature. The experiment result shows that the system runs stably and credibly, the parameters can be collected accurately and the temperature control accuracy has been achieved to be ±0.1°C.
Fault Diagnosis of Induction Motor Based on Multi-Sensor Data Fusion
Authors: Li Shu Ying , Tian Mu Qin , Xue Lei
Published: October 2014

For the conclusions of single parameter fault feature diagnosis has some uncertainty, in induction motor early fault, we proposed the use of multi-sensor data fusion technology, acted signal processing to the collected current, vibration and temperature, extracted feature information failure, fused the evidence independent with each other using D-S evidence fusion rules. According to the final combination results of all the evidence, combined with intermediate results of the evidence combination, we achieved the accurate identification of induction motor rotor early failures and composite fault. The diagnosis examples show that the use of multi-sensor data fusion technology can significantly improve the accuracy and reliability of early fault diagnosis.
Finite Element Analysis of Car's Sub-Frame
Authors: Tang Pei , Xia Ji Sheng
Published: October 2014

This paper studied the sub-frame of car. To optimize the design of the sub-frame of car, the finite element analysis was applied to the sub-frame.Through the static analysis, it found that the yield maximum stress is greater than the vice stress of frame material. The result showed that the static strength of sub-frame met the requirements.The rationality of the design of the side frame was verified. The twelve order modal parameters of sub-frame were analyzed.
Finite Element Analysis of Engine Fixed Parts Assembling Process
Authors: Ling You Lin , Liu Yan , Zhang Jian , Tang Wen Xian
Published: October 2014

In order to select the best design method for stay bolts in the diesel engine assembling process, main fixed parts of some MAN low-speed marine diesel engine were analyzed based on finite element analysis software Hyperworks. The mechanical performance of bottom, frame and cylinder under the effect of the four kinds of assembling methods was investigated. Ultimately, the best assembling process was confirmed. Results indicated that the finite element analysis model was reliable and exactly. The middle to both sides assembly was the best among the four methods.
Flow Resistance Coefficient Identification of Chilled Water System Based on Multi-Objective Optimization and Experiment Validation
Authors: Hou Zhi Jian , Qu Ming , Wang Zhi Rui
Published: October 2014

Hydraulic resistance coefficient (HRC) is a fundamental parameter that characterizes the hydraulic state of a water pipeline and significantly determines the efficiency of the water-transport process. To estimate HRC and diagnose hydraulic process fault in building air conditioning system, a novel method called multi-objective optimization (MBO) strategy was developed in the research effort. MBO is concerned with mathematical optimization problems involving more than one objective function to be optimized simultaneously. In this paper, first, the basic principle of the approach is presented. Then several experiments are conducted to identify the HRC in a real air conditioning system. And the water flow rate of each air handling terminal unit is estimated by the flow rate of primary pipe and identified HRC. The experiment results show that the model can accurately estimate HRCs. The HRCs of each pipe and terminal unit were obtained by the flow rate and the pressure difference of primary pipe without requiring geometric specifications, which is very convenient in real engineering application.
Helicopter Reliability Researching Based on Neural Networks
Authors: Zhang Hong Bin , Ju Yan Qiu , Cao Xue Feng , Qi Chi
Published: October 2014

Neural networks application in helicopter reliability researching is introduced in this paper. Because of high cost and long collected time, the collecting of helicopter reliability data is difficult, so it is difficult to establish the reliability data distribution model, predict the reliability and allocate the reliability of helicopter. By using the neural networks, the reliability data of helicopter is extended. The reliability data distribution model can be established, the reliability prediction can also be done accurately. It is proved by the instance that the reliability prediction accuracy is improved 98.4% by using the fuzzy neural networks. The application of neural networks has a good reference to helicopter reliability researching.
Mechanical and Electrical Integration in the Application of the Excavator
Authors: Lv Gen Lai
Published: October 2014

Mechanical and electrical integration, also known as mechanical, electronics is an interdisciplinary comprehensive high technology, is made up of microelectronics technology, computer technology, information technology, automatic control technology, mechanical technology, hydraulic technology and other technology cross mutual fusion and become an independent discipline. This article mainly discusses the mechanical and electrical integration in the application of all kinds of excavator.
Research on Friction Wear Characters and Microcosmic Mechanism of Galvanized Sheets
Authors: Wang Lei Gang , Zhou Jian Fen , Huang Yao , Sun Xian Ping
Published: October 2014

Wear tester UMT-2 was used to study the friction wear characters of galvanized sheets under dry friction and oil lubrication. Three-dimensional morphology instrument WYKONT11 was used to observe the width and maximum depth of wear scars, surface roughness and surface topography. Energy Dispersive Spectroscopy (EDS) analysis of zinc coating compositions and tests of micro hardness were carried out. Then, the friction wear mechanism of galvanized sheets was preliminary discussed. The experimental results indicate that, under dry friction, galvanized sheets experience three stages: run-in wear, abrasive wear and adhesive wear. Meanwhile, zinc coatings exfoliate until they lose efficacy. Good lubrication is propitious to protect zinc coatings and it can reduce friction wear. The research results can provide guidance for formability analysis and mold design of galvanized sheets.
Multistage Self-Priming Pump Performance Simulation & Test Research
Authors: Liang Gao Feng , Gao Qiang
Published: October 2014

Currently the application of traditional centrifugal pump design theory to develop the multi-stage centrifugal pumps is very mature, but the factor of affecting hydraulic performance of centrifugal self-priming pump is still unclear. In this paper, using CFD method to simulate the hydraulic performance of the multistage self-priming pump in different operating conditions, and get the performance prediction curve. The simulation results were compared with experimental data, the result shows that simulation method can accurately predict the performance and internal flow characteristics of multi-stage self-priming pump. The impact on the hydraulic performance by water-keeper chamber and the gas-liquid separation chamber is very limited. The self-priming components can provide a better hydraulic performance. This will be as a reference for the design of self-priming pump.
Nursing Robot Design Based on the Concept of Industrial Design
Authors: Zhu Yan , Wang Ting Jun , Zhang Huan Huan
Published: October 2014

The objective of this paper is to propose a method applied in designing nursing robot which can provide life support for the elderly living alone. The overall industrial design needs to abide by the design principle based on human beings. The proposed method is put forward from four aspects of form, color, material and human computer interaction and the final innovative design is proved to be better than other similar designs and promotes the industrialization of the nursing robot in China. Under the situation of there is still a big gap in study of the nursing robot between China and other countries, our efforts will make a positive contribution to Chinese research of industrial design of nursing robot.
Reliability Analysis of the Home and Abroad CNC Equipment Used in Automobile Parts Industry
Authors: Ma Bin , Luo Min , Chen Zhi Chu , Cao Li Xin
Published: October 2014

Through analyzing fault information of the home and abroad CNC equipment used in the same auto parts production, the fault data fitting were implemented in this paper. Assuming time between failure probability density function and the empirical distribution function follow the Weibull distribution, A reliability statistical model was built using the least squares method and a linear parameter distribution model regression method. The linear correlation test and the Weibull distribution fault interval obtained show the fact that both the home and abroad equipment are subject to the two parameter Weibull distribution, and after calculating the three indexes of reliability assessment, a conclusion can be made that the reliability of domestic equipment in the study is slightly lower than that of foreign equipment.
Research of Modeling and Control Method for Electromagnetic Levitation System
Authors: Zheng Jian Guo , Zou Zhi Gang , Zeng Hui , He Tian Peng
Published: October 2014

There has been wide interest in the control scheme of the electromagnetic levitation system due to its disadvantages of nonlinearity and open-loop uncertainty. A typical coil-ball levitation system is used in research. The forces of the ball are analyzed and a dynamic model of the whole electromagnetic levitation system is established. Based on the nonlinear state-space model, the coil-ball system is linearized and then a LQR control approach is proposed. Simulation results show that, compared with conventional pole assignment scheme, the electromagnetic levitation system under the proposed control approach gets a better performance, including smaller overshot and faster response.
Research on Reliability Analysis of Plane Power Supplying System Based Bayesian Fusion
Authors: Xu Jiang Jun , Xiao Zhi Jian
Published: October 2014

Reliable operation of the aircraft power distribution system is critical to the flight safety of a plane。In this paper,the reliability evaluation model of aircraft power supplying system based on Bayesian fusion is set up。 Calculating reliability indexes by using MATLAB simulation softwaer。Comparing with the traditional Bayes approach,the result shows the method is efficient。
Research on the Calibration Method of Acceleration Sensor’s Data Filtering
Authors: Yin Bo Ya
Published: October 2014

This paper takes the calibration method of acceleration sensor’s data filtering as the research subject. It adopts the modified selective filtering method based on the sigma judgment and the zero-point calibration method with the fluctuating wind as the starting and ending point, to correct the acceleration data ideally and to make the images more realistic. Selective filtering method also can be utilized in the image denosing.
Resistive Gas Sensors Based on MWCNTs-PVP Composite Films
Authors: He Huan , Xie Guang Zhong , Zhou Yong , Tai Hui Ling
Published: October 2014

In this paper, multiple-walled carbon nanotubes (MWCNTs) monolayer film and MWCNTs-polyvinylpyrrolidone (PVP) composite films were fabricated on interdigitated electrodes (IDEs) by airbrush technology, respectively. Response performance of all the sensors to various concentrations of vapors including methanol, ethanol, acetone, tetrahydrofuran, water and 1,2-dichloroethane were investigated. The results showed that a larger sensing response was obtained for the composite films compared with the MWCNTs monolayer film. Moreover, the MWCNTs-PVP composite films had a good selectivity for 1,2-dichloroethane vapor.
Research on the Carrier Frequency Loss Characteristics of Induction Motor Fed with Variable Frequency Power
Authors: Wu Yao Hui , Ji Cheng Fang , Meng Xiu Feng
Published: October 2014

The artical for the consumption problem caused by carrier frequency of motor with variable frequency power supply.According to the principle of frequency conversion,the frequency conversion power model has been established, which applied to finite element model of motor.Then they implement joint simulation calculation. It is concluded that the characteristics relationship between the carrier frequency and loss of motor when variable frequency power supply. The characteristic of relationship between the loss of the motor and the carrier frequency proved by experiment when the carrier frequency inverter power supply.It has reference value for the design of variable frequency motor, frequency conversion application and energy saving.
Research on the Control Method of Bending Mode of AFS System Based on Preview Control
Authors: Li Li Fu , Yang Ming Jun , Zhang Jin Yong
Published: October 2014

The Adaptive Front-lighting System (AFS) has been widely concerned in the area of traffic safety. Firstly, it's an analysis of research achievements about control method and mathematics model of AFS, and the question is focused on the lag of headlamp control system, which means the actual bending angle of AFS always lags behind the steering-wheel angle. Then, a study of how to solve this lag has been proceeded. After the geometrical relations among safety braking distance and the rate of steering-wheel angle and turning radius of the vehicle is analyzed, an mathematics model considered these variables has been set up. In order to improve the road illumination of the bending beginning stage, a preview control method and the control algorithm of preview model, rolling optimization and feedback correction have been set up. Based on this preview control algorithm, a simulation model of the whole AFS has been built as well as the AFS control experiment platform. After a comparison between preview control and servo control, it can be discovered that preview control method is superior to servo control in AFS system.
Signal-Digital Conversion of Stepper Motor Used in Ships
Authors: Yu Hai Xia , Lin Min , Fu Cai Kui , Wang Lu Yun
Published: October 2014

In this paper, we will select and use stepper motor which is comparatively important and widely used in ships for the study. Through the study, we can propose a method that we can use the synchronous repeater compass for the high-precision digital conversion, and then statistics will be put into SCM AT89C52 with the simple handling of circuit conversion, thus, we can take a series of processes, such as data processing, initial value setting, directional displaying and serial port outputting. Foremost, the precision of this converting circuit can reach 0.1°that can ensure the numbers continuously change behind the decimal point one digit. So it is not only inexpensive, but also flexible and convenient in use.
Simulation and Optimization of SCR System for Common-Rail Diesel Engine
Authors: Ruan Guan Qiang , Cheng Jin Run
Published: October 2014

The turbo diesel SCR system has been researched and analyzed in this paper. By using software of CATIA, three-dimensional physical model of SCR system has been established, and with software of AVL-FIRE, the boundary conditions have been set, simulated and optimized. In the process of SCR system optimizing, it mainly optimized the pray angle. Compare the effects of processing NOx to obtain batter optimization results. At last the optimization results are compared by bench test, and the experimental results are quite consistent with simulation.
Study on the Variable Weight Method for Gearbox Fuzzy State Evaluation
Authors: Zheng Huai Liang , Wang Ri Xin , Xu Min Qiang
Published: October 2014

Based on the gearbox as the research object, we discussed the problem: how to confirm every part’s weight when assess gearbox’s state by fuzzy comprehensive evaluation method. Contraposing the main problem of the weight-fixed Analytic Hierarchy Process (AHP) that ignoring every part’s fault degree in the process of evaluation, a variable weight method is proposed base on the rate of fault degree contribution. And to a state known gearbox, the weight of each part in the whole gearbox assessment is confirmed by the AHP and the variable weight method respectively. The comparison of the two assessment results shows that the result get by the variable weight method is more close to the gearbox’s real state, so this method is more accurate. What’s more this method is very simple, and can be used in real project.
The Reliability Analysis of Shipboard Artillery Ammunition Automatic Demolition System
Authors: Wang Jun Sheng , Lei Jun Wei , Wang Yi Dong
Published: October 2014

The past and present situation of shipboard artillery ammunition demolition processing are summarized in this paper. The shipboard artillery ammunition automatic demolition technology is put forward for meeting the needs of modern war in this paper. This technology will greatly improve the rear and factory's comprehensive demolition ability to scrap shipboard artillery ammunition. It ensures the mass demolition processing for scrap shipboard artillery ammunition. Also, it will has a profound influence on our ammunition management.
The Simulation and Experiment Research on the Influence of Crankshaft Flexible Torsion to Diesel Instantaneous Speed
Authors: Sun Yun Ling , Tian Hong Xiang , Li Lin
Published: October 2014

The flexible crankshaft may influence diesel’s instantaneous speed when diesel runs at high speed and load. In this paper the nine-degree crankshaft dynamic model is set up aim at 6-135 type diesels, and studies the instantaneous speed fluctuating rules at different position of crankshaft. The Simulating outcome shows that the obvious difference and rules are exist in instantaneous speed of all degrees: The instantaneous speed waveform corresponding to each cylinder accomplishes a change of several small wave crests to one beg crest gradually from freedom end to flywheel end. At last the simulating outcome are compared to experimental measured instantaneous speed of freedom end and flywheel end, they are in agreement at both wave shape and frequency spectrum sides, then the model’s effect is proved.
The Turbocharger Products and Manufacturing Research
Authors: Xu Su Ying
Published: October 2014

the exhaust turbine supercharger in the process of manufacturing is made up of many enterprises to participate in the production and management. Production organization form of the differences is determined by the scale of production and mode of operation. Parts of casting blank and parts processing has formed a complete industrial chain. Complete parts processing and manufacturing industry chain has failed to form the advantage of the products. Many companies, management can not meet the user's demand. Also can't satisfy the hosts, scale and qualification requirements of production enterprises. Enterprise management has been formed a consortium. Enterprise production scale and qualification of such as to meet the requirement of enterprises for internal combustion engine accessories. The manufacture of parts and exhaust turbocharger parts processing and assembly in production process can be controlled. Is helpful to the enterprise's development and improvement of product quality.
Three Dimensional Localization Technology for Mobile Device Based on WLAN
Authors: Wang Hai Feng , Wen Zhi Gang , Li Hai Lian
Published: October 2014

We present a Three-dimension WLAN based indoor localization system for mobile device. It is based on the RSS of the wireless signal and estimates the target node’s localization. Multi-times measurement and filter will improve the accuracy of the localization. In the end this system achieves the Three-dimension indoor localization system.
The Study of Cavitation Erosion Protection Performance of Heavy-Duty Engine Coolants
Authors: Chen Jin Mao , Leng Guan Jun
Published: October 2014

Ultrasonic vibratory cavitation erosion tests were carried out on studying the cavitation erosion protection performance of different type of heavy-duty engine coolants for cast iron material of wet sleeve cylinder liners. The influence of coolant type, freezing point, corrosion inhibitor content and test duration on anti-cavitation performance were analysed. The experimental results showed that the anti-cavitation erosion performance of organic acid type heavy-duty engine coolants were better than the inorganic salt type heavy-duty engine coolants. For the same formulation coolant, increasing the content of ethylene glycol or corrosion inhibitor can improve the anti-cavitation erosion performance. With the extension of ultrasonic vibration test time, the anti-cavitation erosion protection performance for cast iron was reduced.
Mathematic Analysis and Performance Simulation for Exhaust Muffler Based on Transmission Loss
Authors: Li Xiao Dong , Ma Xin Tan
Published: October 2014

Transmission loss is an important noise reduction parameter of exhaust muffler. Based on the finite element method, transmission loss is calculated, and the influential effect of the fluid is considered in this paper. Through calculation of transmission loss of the single expendable muffler and composite muffler, the results show that expansion ratio affects amplitude of transmission loss, and expansion chamber length affects the attenuation frequency bandwidth. The analysis method and conclusions are instructive to the design parameters of exhaust muffler.
Mathematical Model and Finite Element Analysis of Acoustics Performance of Composite Exhaust Muffler
Authors: Li Xiao Dong , Ma Xin Tan
Published: October 2014

. Since the theory of one-dimensional plane wave is difficult to predict the internal sound field of the complex structure muffler accurately. Mathematical model of the composite muffler is analyzed, and the three-dimensional finite element method is adopted to establish the acoustic model in this paper. Transmission loss and characteristics of internal sound field of the composite muffler are calculated through sound and vibration simulation. Influential effect of the fluid on transmission loss is analyzed. The analysis method and conclusions provide a basis for the design of composite muffler.
Research on Breaking Energy Mechanism of Tunnel Boring Machine Disc Cutter Rock with CSM Model
Authors: Zhao Nan , Song Li Wei
Published: October 2014

Full face rock tunnel boring machine in construction process, disc cutter put pressure on rock breaking, actually belongs to the process of energy transfer, from the point of view of energy analysis the energy transfer rules in the process of disc cutter rock breaking, based on CSM force prediction model, analysis disc cutter energy input and rock mass energy output efficiency ratio, for excavation with minimum energy efficiency. Taking S-536 Hong Kong water tunnel TBM as an example, When the penetration is 10mm, based on the energy efficiency ratio the optimal disc cutter spacing should be less than 70mm, than the actual average disc cutter spacing is small 2mm, rock mass as a reference the disc cutter rock breaking efficiency mechanism provides certain reference value for the cutter layout.
Theoretical Study of Solar Energy Aided Auxiliary Steam System
Authors: Wang Meng Jiao , Hou Hong Juan , Yang Yong Ping
Published: October 2014

This paper proposed using solar energy as the auxiliary heat source of coal-fired power plants’ auxiliary steam system based on the current status of the coal-fired power generation and solar energy utilization. Taking a 600MW coal-fired power unit as an example to analysis, it is shown that the thermal performance of the integrated system is improved and the coal consumption rate declines, which radically reduces power plants’ emissions of greenhouse gas and pollutants.
Energy Consumption of Turbine Unit with Varying Exhaust Pressure under Off-Designed Conditions
Authors: Wang Ning Ling , Xu Han , Fu Peng , Wu Dian Fa , Yang Zhi Ping , Yang Yong Ping
Published: October 2014

The exhaust pressure affects the economic performance of the whole power unit greatly. Based on the theory of energy specific fuel consumption (ESFC), the changing principle of energy consumption in a power unit was studied. In the turbine unit, the energy-consumption caused by topological factors was also discussed with different exhaust pressure. The results showed that the changing of exhaust pressure makes great effects on topological energy consumption of steam turbine. It makes great reference for the energy-saving diagnosis of the energy consumption for the overall power units.
The Design of Filter Parameters of Dynamic Voltage Restorer in Medium Voltage Network
Authors: Yao Sen Jing , Zhu Zheng Guo , Zhang Hua Ying , Cao Jun Wei , Zhang Guang Yi
Published: October 2014

Dynamic Voltage Compensator (DVR) is able to handle the dynamic power quality problems in distribution network, such as voltage sags and voltage unbalance, and the parameters of the output filter will have important affect on the compensation results. In this paper, the parameter design method of the output filter of a cascaded H-bridge based DVR applied in medium-voltage distribution grid is studied. Through the analysis of the case when filter inductor current has the maximum value, the theoretical expression of the relationship between the low limit of the value of filter inductor and the capability of voltage compensation and power factor is derived. Meanwhile, the method of selecting the filter capacitor value is ​​obtained. The realization of the proposed method are given by taking an engineering project as an example, the correctness and validity of the design method of filter parameters proposed in this paper are verified by simulation.
Effects of Material Parameters on Longitudinal Vibration Band Gaps in Thin Phononic Crystal Plates
Authors: Zhao Hao Jiang , Liu Rong Qiang , Guo Hong Wei
Published: October 2014

The improved plane wave expansion method is used to investigate the effects of material parameters on the longitudinal vibration band gaps in thin phononic crystal plates. Both square lattice and graphite lattice are considered. Results show that the parameters playing the essential roles are the mass density ratio and the Young modulus ratio of the scatterers and the host materials.
Design of a Multi-Arm Robot for Mandible Reconstruction Surgery
Authors: Zhao Hong Hua , Tian Jian Ying , Li Dong Song , Ai Chang Sheng
Published: October 2014

Clinical treatment for mandible defects is Mandible Reconstruction Surgery (MRS) including bone grafts, distraction osteogenesis and bone tissue engineering, however, MRS is operated by doctors without 3D navigation at present which leads to lots of disadvantages such as bad operational control, low positioning accuracy and poor stability. Therefore, a robotic surgical system was designed to assist surgeons on manipulating. For this study, the robot system was given in brief, then mechanical design and control system of the novel three-arm robot.And experiment results in this study show that the robot works stably and accurately. The development of this medical robot system contributes to the promotion and popularization of the MRS in clinics.
Force Ripple Suppression Research for Linear Motor Servo System Based on BP Neural Network
Authors: Peng Rui , Zeng Yue Nan , Tang Jian , Chen Kang Ping
Published: October 2014

For the permanent magnet synchronous linear motor’s (PMSLM) force ripple, the mathematical model of detent force is established in this paper, and presents a suppression strategy based on neural network. By the designing of BP neural network force ripple observer, theoretical analysis shows can effectively restrain the force ripple. Simulation results show the correctness and validity of the suppression strategy.
Speed Sensor-Less Vector Control Used in DFIG Wind Power Generation Based on EKF Algorithm
Authors: Hu Bei , Duan Pan , Feng Shi Cheng , Duan Qi Chang , Mao Ming Xuan
Published: October 2014

Wind power generation system is a typical nonlinear system. As wind speed is changing constantly, induction motor with conventional speed sensor-less control method has great estimated error. Wind power generation system with the control method cannot be good at tracking maximum power point. The paper put forward a novel control method that estimates the angular velocity and the rotor flux of the wind turbine based on EKF, As a result, induction motor with double-loop sensor-less Vector Control is realized. Simulation results show that the control scheme is effective.
Design of Permanent Magnet Synchronous Motor Control Chip Based on SOPC
Authors: Chen Peng Fei , Zeng Yue Nan , Peng Zu Qun , Wu Li Zhi
Published: October 2014

This article presents a program for permanent magnet synchronous motor (PMSM) vector control chip design based on SOPC technology. Microprocessor NIOSII and hardware arithmetic unit such as CORDIC and SVPWM, were all integrated in a FPGA by using bus interconnect and IP reuse technology, so that became a dedicated control chip of PMSM. Using hardware and software co-design methods, the chip was designed on Altera's CycloneIII FPGA, chip design flexibility and use small resource. Finally, combined with the power driver board achieved the dual closed-loop control of PMSM. The results show that system have a good performance, which proved that system can be well controlled by the designed IC.
Research on the Control of Distributed Power Grid-Connected Inverter
Authors: Tang Jian , Zeng Yue Nan , Zhou Bin , Liu Jin Hui
Published: October 2014

Based on voltage space vector modulation, a distributed power grid-connected inverter (DPGCI) utilizing double loop control strategy is researched, the system is able to feedback power to grid with constant power and unity power factor. the static and dynamic performance is good. Firstly, a mathematical model of inverter system in two-phase synchronous rotating coordinate is built, based on this, a outer power loop and inner current loop control strategy is proposed, realizing the independent control of active and reactive power. Experimental results show the correctness and validity of the control strategy.
Growth of Tunnels during Aluminum DC Pulse Current Etching
Authors: Liu Dan Lu , Xiao Ren Gui , Zou Teng , Wang Jian Zhong , Cao Jian Xin , Xu Dao Yun
Published: October 2014

High-purity aluminum foil was etched with DC pulse current in acids solutions at first time. Experiments indicated that tunnels morphology was influenced by current density, pulse duty-cycle and frequency of DC pulse current, tunnels began to grow when the current density reached to 0.8A cm-2, and tunnels grew along three directions to form a netlike construction in the surface of aluminum foil, which increased effectually surface areas of aluminum foil. In addition, when aluminum was etched in the solution of 1 N HCl +0.8 N HNO3,tunnels morphology shows that tunnel does not grow continually during DC pulse current etching, so it is a method to study the mechanism of tunnel growth, for example period of tunnel growth, velocity of tunnel growth. The experimental results are discussed according to tunnels morphology.
Optical Fiber Sensor System for Detecting the Steel Ball Surface Quality
Authors: Wang Cheng Lin , Ai Chang Sheng , Li Guo Ping
Published: October 2014

The design of the optical fiber sensor system is used to detect the steel ball surface roughness and defects with displacement change such as cracks, pits, bumps and so on. Experiment results show that the sensor can distinguish between surfaces with different roughness. By establishment of the equivalent evaluation standard for surface quality, the system could detect whether the steel ball surface quality is qualified.
Absorption Parameters Measurement of Methane in υ4 Band Utilizing Quantum Cascade Laser Based Sensing System
Authors: Wang Ling Fang
Published: October 2014

This paper represents the line parameter measuring results base on pulsed DFB quantum cascade laser with tunable in the spectral range of 1248-1257 cm-1. The transition is in the υ4 band and P (8) branch which is lying in the line position of 1253.46436 cm-1based on HITRAN simulation. The calculated line intensity is 1.85×1020 cm-1/cm-2molecule and the pressure broadening parameters in N2and Ar are 0.061± 0.003 cm-1atm-1and 0.086 ± 0.007 cm-1atm-1respectively.
Development of Proposed Bi-Modal Human Motion Classification System
Authors: Yong Ching Yee , Sudirman Rubita , Chew Kim Mey
Published: October 2014

The main objective of this study is to discover and investigate greater levels of human motion activities recognition. The study presents four approaches of human motion data processing to recognize the human activities. Data collection process was performed in two ways: wearable sensor based in signal data and vision based in image data. The proposed approaches used to analyze the signal and image data are: wearable sensor using 3-space sensing with angular velocity and elevation angle as moderators, wearable sensor using statistical nine existing and a proposed developed classifiers as classification learning system, vision based using skeletonization with humerus-radius and horizontal-radius as measuring angle and vision based image-signal histogram using 2D-1D transformation method. The principal contributions of this thesis are the development of the human motion analysis methods with validated evaluation process tested on the proposed systems. The proposed systems achieved more than 98 % for signal processing and 97 % for image processing of accuracy on recognizing human activities.
Signal Processing of Microwave Imaging Brain Tumor Detection Using Superposition Windowing
Authors: Chew Kim Mey , Sudirman Rubita , Seman Norhudah , Yong Ching Yee
Published: October 2014

This paper discusses the selection of window function for signal processing in microwave imaging brain tumor detection. Most of the window functions are non-negative bell-shaped curves. This paper proposed a superposition windowing function for better time series data analyses and enhancement. The performance of the selected five window functions (Hamming, Blackman-Harris, Parzen, Chebyshev and Bartlett-Hanning) and the proposed superposition window were compared and evaluated. The results show the superposition window function is potentially reduce the unwanted noise and preserve important information of the signals.
Technological Process of 500MPa Hot-Rolled Ribbed Steel Bar
Authors: Fu Jian Xun , Li Tao , Zhu Eng Yu , Wu Chang Jin
Published: October 2014

During the state when China’s economy is highly developed and the investing for engineering construction is growing year by year, high strength steel bar has become the most wildly used constructional materials for architecture. 500MPa hot-rolled ribbed steel bar satisfied the requirements for quake-proof and wide-span construction materials for it’s high strength, good ductility and good weldability, 500MPa hot-rolled ribbed steel bar can be produced through different methods, such as micro-alloying, TMCP (thermo mechanical control process), post-rolling residual heat heattreatment. Microalloying process increased the strength and toughness, but the weldability decreased. TMCP and post-rolling residual heat heat-treatment can save the cost of micro-alloying elements, while the demand of equipment is much higher.
A Detection and Compensation Method for Dynamic Routing and Transmission Delay
Authors: Zhuo Yue , Chen Bao Ren , Chu Yin Jun
Published: October 2014

It is an important approach to synchronize time in power communication network that the reference time signal covers whole network by SDH link transmission. Various types of noise of the SDH link transmission delay will affect time synchronization accuracy. This paper studied the change of the one-way delay caused by SDH link protection switching and described a method to detect dynamic routing and compensate transmission delay automatically. Measured in the existing network, time synchronization client using the technology can be adapted to SDH link protection switching, and time synchronization accuracy is not affected.
Storage and Output of Basic Data Types in C
Authors: Yan Bi Bo
Published: October 2014

The paper discusses the basic data types that defined in C and analysis the forms of data storage in memory. Some examples demonstrate how to store data in memory and how to output the different types data by using formatted output character.
Planning Method of the Virtual Disassembly Operation Process Based on Time Petri Net
Authors: Liu Bin , Xu Ting , Jiao Yu Min
Published: October 2014

According to problems of deficiency guidance in the traditional virtual disassembly training, the planning method of disassembly operation process based on Petri-net is presented. By this method, Disassembly Petri-Net (DPN) model process-oriented is built. In this model, constraint relations for the process and generation rule for DPN are studied. At last, by taking the transmission of bulldozer as example, planning method and its solution aimed at timeliness are proposed. The example shows that the planning results can improve training effect significantly, which provides a practical and efficient training platform for trainees.
Research Progress on Vehicle NVH Technology
Authors: Yue Ming Yue , Zhou Yi Dan
Published: October 2014

Vehicle NVH phenomena is one of the most important phenomenaabout vehicle comfort, this paper proposed the existence of vehicle NVH problems, analyzed the causes of vehicle NVH and the transmission paths, IntroducedNVH control methods,and made the futureprospects of NVH.
Research on Drag Reduction Performance of Bionic Shark Gill Jet Surface
Authors: Gang Zhao , Li Fang , Liu Wei Xin , Liu Ming Ming , Bi Hong Shi
Published: October 2014

According to the problem of bionic shark gill jet can reduce friction on shark surface, a model of bionic jet surface was established based on shark surface was analyzed by measurements, and its numerical simulation was processed by using RNG k-ε turbulence model. The results show that: the gill jet can reduce frictional resistance on shark surface, and the best drag reduction can be got when the speed of main field is 5m/s, furthermore the maximum drag reduction rate can be up to 17.15%. The pressure of jet hole upstream is reduced which due to the barrier to the facing fluid by the jet, so that the pressure resistance of jet surface is reduced as well. Besides, jet fluid is blocked in the boundary layer by mainstream fluid, which caused the fluid velocity of jet hole downstream is reduced, the thickness of boundary layer is increased, and the normal velocity gradient of wall is reduced, so as to achieve the effect of drag reduction.
Experimental Research on High Temperature Corrosion Prevention Technology for Water Wall of Opposed Wall Fired Ultra Supercritical Boiler
Authors: Jiang Bo , Liu Fu Guo , Liu Ke , Liu Hao Jie
Published: October 2014

In order to solve the problem of high temperature corrosion to water wall of opposed wall fired ultra supercritical boiler, comprehensive study is carried out by combining theoretical analysis and experimental research, obtaining the variation of flue gas composition before and after introduction of near wall wind and effect of primary air velocity, central air opening, swirl intensity of outer secondary air and inner secondary air opening on composition of flue gas in near wall region. The results show that 1) the introduction of near wall wind significantly improves reducing atmosphere in near wall region; 2) among the four parameters listed above, swirl intensity of outer secondary air and inner secondary air opening have greater influence on composition of near wall flue gas; 3) under the comprehensive effect of swirl intensity of outer secondary air and inner secondary air opening, the volume fraction of CO in near wall flue gas can be controlled below 1500ppm, which effectively disturbs the condition for high temperature corrosion.