bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Implementation of the Mining Monitoring System Based on Wi-Fi
Authors: Zheng Yi Lin , Lin Hu , Yu Kai Kai , Su Xian Li
Published: August 2013

According to the requirements of mine safety warning, the current paper designs and implements the mining monitoring system based on Wi-Fi for collecting and uploading the mine environmental data. The specific studies mentioned in this paper include the transmission of personnel and equipment information, the real-time uploading of alarm information and the real-time issuing of instructions from the dispatch center. Experiments show that the system has the stable and reliable communication between the labels and readers. The system which has the good scalability is also convenient for the access of other Wi-Fi support devices.
The Method for Real-Time Length Measurement of Fiber Winding
Authors: Guo Chen Xia , Yang Rui Feng
Published: August 2013

The paper discusess mainly how to accurately measure the real-time length of fiber optic gyroscope sensing coil (fiber coil) in the process of FOG coil winding. First, using the improved moving target detection algorithm to process the fiber images collected by machine vision. Secondly, using software algorithm to calculate the real-time radius of fiber winding. Finaly, combining the incremental optical encoder with real-time radius to calculate real-time winding length of fiber coil.
Study on Improvement Transient Stability of the Large-Scale Wind Farms Integration with STATCOM
Authors: Wu Yan Juan , Li Lin Chuan , Zhang Fang
Published: August 2013

In view of a serious threat for the transient stability of the power system being caused by the large-scale wind farms integration, and combining with advantages of STATCOM which can quickly restore the fault voltage and fastly, flexibly and smoothly compensate the reactive power, a method is proposed using STATCOM controller of to improve transient stability of the power system integrated by large-scale wind farms. The control strategy of the STATCOM controller uses adaptive double loop control. The role of the device to improvement transient stability of the power system is studied under the condition of serious fault. by simulation comparison with the condition without STATCOM controller installed at the same place. The simulation results show that the STATCOM controller can clearly improve transient stability of the power system integrated by large-scale wind farms.
Application of Chaos in Permanent Magnet Synchronous Motor Optimization
Authors: Gao Qiang , Chen Sha Sha , Tan Pan Long , Song Yu
Published: August 2013

Permanent magnet synchronous motor (PMSM) is a system with multi-variable, strong coupling and nonlinear. It is difficult to establish its precise mathematical model, and the parameter optimization method of PMSM control system is subject to many limitations. Aiming at the design of PID tuning of PMSM control system, a chaos optimization method based on Logistic chaotic map is proposed to avoid the complex process of PMSM modeling and parameter optimization analysis. Results have shown that this method is simple and efficient with short response time and small overshoot after the parameter optimization.
Switching Power Supply System in Parallel Based on Master-Slave Current Law
Authors: Li Guo Hong , Meng Fan Yu
Published: August 2013

The design introduces the master-slave current sharing technology as the core, DC-DC converter consists of two parallel systems consisting of digital switching power supply. The design for the master MCU AVR mega16,driven by the IR2105 BUCK circuit composed of power MOSTL084 and TL494 consisting of voltage and current sampling and PWM generation circuit. The achievement of master-slave current-sharing technology, through the collection of the current in branch one and programmable gain to set the current in branch two, to reach the proportional relation of branch one and branch two. After testing, the system stabilizes with high control precision and high efficiency.
Design of Encoder and Decoder for Q-Ary LDPC Codes Based on FPGA
Authors: Wang Zhong Xun , Wang Peng Xiang
Published: August 2013

The scheme of FPGA hardware implementation based on the RA structure of encoder for q-ary LDPC codes as well as the Max-log-BP decoding are designed emphasisly. Form the performance, speed, and resource consumption situation of coder and decoder, this scheme based on FPGA can meet the requirements of the most of communication systems.
Research and Design of the Solar Charging System Based on FPGA
Authors: Cheng Hong Li , Zhang Geng Chuan , Zhang Wei
Published: August 2013

This article introduces an efficient solar charging system based on FPGA. The charging circuit composed of BUCK-BOOST switch converter, realizes the function of maximum power point tracking (MPPT) of solar cells by using high speed controller---FPGA and a new MPPT technology---WVSVH P&O method. This paper explains the design and simulates it. The simulation results show the topology is able to achieve the purpose of charging efficiently.
Emotion Recognition from Speech Signals Using Elicited Data and Fuzzy KDA
Authors: Bao Yong Qiang , Zhao Li , Hang Cheng Wei
Published: August 2013

In this paper we introduced the application of Fuzzy KDA in speech emotion recognition using elicited data. The emotional data induced in a psychology experiment. The acted data is not suitable for developing real world applications and by using more naturalistic data we may build more reliable system. The emotional feature set is then constructed for modeling and recognition. A total of 372 low level acoustic features are used and kernel discriminant analysis is used for emotion recognition. The experimental results show a promising recognition rate.
Voltage Flicker Extraction Based on Wavelet Analysis
Authors: Chai Lin , Sun Jun Ru
Published: August 2013

Extracting voltage flicker from the sampling voltage signal is a precondition for management of flicker. Voltage flicker signal is a low frequency time-varying non-stationary signal. The traditional fourier transform has great limitations when analyze the non-stationary signal for not having the time resolution. As wavelet transform has good property of time-frequency localization, it become a powerful tool for analyze this kind of signal. This paper adopts multi-resolution analysis of wavelet to extract voltage flicker signal. Furthermore, according to the characteristics of wavelet function, this paper selects Daubechies wavelet to accomplish the multi-level decomposition and reconstruction of signal, in order to get the frequency and amplitude of voltage flicker signals. Based on the principle of modulus maximum, it can be determined what time the voltage flicker happen and over. The results of MATLAB simulation indicate that voltage flicker signal can be effectively extracted by wavelet multi-resolution analysis. Wavelet multi-resolution analysis is considerably ideal for voltage flicker extraction.
Visual Saliency and Extended Hidden Markov Model Based Approach for Image Splicing Detection
Authors: Li Xiang , Shen Xuan Jing , Lv Ying Da , Chen Hai Peng
Published: August 2013

In order to improve the detection accuracy of spliced images, a new blind detection based on visual saliency was proposed in this paper. Firstly, create the edge conspicuous map by an improved OSF-based method, and extract fixations by visual attention model. Then locate those fixations on conspicuous edges by conspicuous edge positioning method. Accordingly, key feature fragments can be captured. Secondly, extract Extended Hidden Markov Model features, and reduce their dimension by SVM-RFE. Finally, support vector machine was exploited to classify the authentic and spliced images. The experimental results showed that, when testing on the Columbia image splicing detection dataset, the detection accuracy of the proposed method was 96.68%.
Based on Digital Image Processing Ore Appraisal Method Research
Authors: Huang Jiang Tao , Peng Jian , Li Feng Bo
Published: August 2013

with high speed development of the digital image processing technology, and computer image processing technology used in scientific research more and more widely. Mineral, resources and environment, and other fields, image processing technology also has a wide range of applications. This paper is the application of digital image processing techniques to realize to study all the features of ore and automatically recognize ore , pattern recognition method applied to mineral recognition and testing field, so as to achieve the goal of mineral appraisal.
A Semi-Supervised Fuzzy Clustering Algorithm Based on Mahalanobis Distance and Gaussian Kernel
Authors: Li Kai , Zhou Yu Fei , Li Xiao Juan
Published: August 2013

Semi-supervised clustering is a method which can improve clustering performance by introducing partial supervised information. This paper mainly studies the semi-supervised fuzzy clustering which introduces Mahalanobis distance and Gaussian Kernel. And we obtain a new semi-supervised fuzzy clustering objective function. By solving the optimization problem, we propose a semi-supervised fuzzy clustering algorithm F-SCAPC which includes F(M)-SCAPC and F(K)-SCAPC. And we do experimental research for proposed algorithm F-SCAPC using the selected standard data set and the artificial data set. Besides, we compare performance of presented algorithm F-SCAPC with AFFC, KFCM-F and SCAPC algorithms. From the results, we can see that F-SCAPC is effective in the convergence speed and the accuracy.
The Network Management Based Multi-Channel Connection Management of MOST
Authors: Chen Yun Han , Qin Gui He , Nan Yang
Published: August 2013

In order to provide higher available bandwidth, flexible accessing and shared multimedia resource to the application in Media oriented systems transport (MOST) network. This paper proposed an implementation strategy of MOST network management, which is described by finite state mechanism model, discussed the scheme of multiple synchronous audio or video channel connection (SA/VCC) management. These works give an improved solution for MOST, which supports flexible accessing and reliable data transmission for multimedia devices, provides reasonable bandwidth allocation and shared multimedia resource in synchronous channel in practical.
Design of Secure Routing Protocol Based on AODV
Authors: Liu Li , Wang Chun Sheng , Liu Song Tao
Published: August 2013

Existing schemes have been firstly analyzed for secure routing protocol in Ad hoc networks. Then we present a new scheme for secure routing protocol base on AODV. Security features in the routing protocol include threshold authentication mechanism based on elliptic curve cryptosystem algorithm and improved the process of authentication without relying on the availability of a certificate authority center. Furthermore, the neighbor supervising mechanism combining with reputation mechanism are adopted to strengthen the management and supervision to network nodes, make the whole process of routing protocol under administration and supervision.
Study on Best Partner Selection Algorithms in Cooperative Network Coding Systems
Authors: He Mei Rong
Published: August 2013

A best partner selection strategy is proposed in cooperative network coding systems. In the strategy, the cooperated partner set is determined by the basic demand that the partners can decode correctly each other. Then, the best partner is selected from the set, which has the best channel gain among the set. Outage probability is also analyzed, and numerical results show that the proposed scheme can reduce outage probability of cooperative network coding systems effectively.
Semantic-Based Three-Dimensional Modeling of Virtual Reality Scenes
Authors: Xue Li Jun , Wang Li Li
Published: August 2013

Virtual reality scenes three-dimensional modeling usually is constructed on the basis of learning with virtual data, and learning behavior is too dependent on virtual data.It is difficult to quickly and accurately reflect characteristics of 3D modeling in virtual reality, and learning complexity is higher. In this paper, a method of virtual reality scenes three-dimensional modeling based on semantic was presented on the basis of analysis of the virtual scenes modeling methods. The modeling system architecture using the method is divided into physical model libraries, three-dimensional model semantic knowledge base, semantic-based visual modeling and scene graph automatically generation modules. The experimental results show that the detection performance is better than the results of the three-dimensional modeling based on virtual data, and the system increases flexibility and usability of the three-dimensional modeling,
The Application of Entropy Weighting Ideal Point Method in Electronic Information Equipment System of Systems Construction Decision-Making
Authors: Zhao Zhi Qiang , Wang Zhi Gang
Published: August 2013

The equipment system of systems (ESoS) construction risk analysis is great significance to enhance decision-making and management level of information technology ESoS construction. The concept of "entropy" in the information engineering is using to calculate the entropy, and the entropy weight is used to fix subjective weight, after that Combining ideal point method to evaluate and select the schemes, the best decision of ESoS construction is get. The model is of impersonality and in reason, which provided a simple and practical method for construction risk evaluation of electronic information ESoS.
Development and Application of the Railway Transportation Management Information System
Authors: Wang Hai Qun , Xue Wen Jun
Published: August 2013

The railway transportation management information system regards the control and management of metallurgical enterprise railway transportation as the object, integrates railway signaling computer interlocking, railway transportation dispatching jobs plan, railway logistics tracking management information and other systems, applys the advanced technology of railway transportation informatization management system, to realize remote control of railway signaling in plant, train management, current car management, locomotive management, statistics management, etc. The system realizes the centralized management and control of railway transportation, meets the requirements of production organization and improve the transportation efficiency.
Intelligent Optimization Study of Traveling Salesman Problem
Authors: Wen Ying Ying
Published: August 2013

Ant colony optimization algorithm is a new simulated evolutionary algorithm by simulating the ant routing behavior of the natural world. In this paper, the basic principle of ant colony algorithm is applied to the classic TSP problem. Simulation examples show that the ant colony algorithm has better robustness and can quickly find the optimal solution.
Research on Vehicle Dynamics Random Response to Uneven Road
Authors: Shi Pei Cheng , Sun Yang Min
Published: August 2013

An 8-dof vehicle vibration model with four-wheeled random road inputs was established. The frequency-domain method was applied to researching the random response of linear vehicle dynamic system. The results show that the frequency error calculated by the 8-dof model is small, but the amplitude is slightly large. Hence, it has referential value to use a simple model to estimate the peak frequency of a practical system. The model of vehicle dynamics as well as the method and program of the calculation of its vibration can predict the ride comfort and safety of the vehicle, and can also provide the scientific basis of researching the stability of vehicle and its influential factors.
Analysis and Optimization on the Front Supporter of Concrete Mixer Truck
Authors: Gao Yao Dong , Ma You Zheng , Kong Xiang Gang
Published: August 2013

The finite element software ANSYS is applied to optimize the front supporter of the concrete mixer truck. The main goal of the optimization is to reduce the quality. The statics analysis and the modal analysis of the front supporter are performed in the most dangerous work condition. The results of the two analyses are combined to explore improvement methods. Then, the topology optimization is performed to propose and establish the final shape and parameterization model. Finally, the multi-objective size optimization is performed to obtain the best optimization result. The maximum equivalent stress has reduced by 7.5%, and the quality has reduced by 13%.
Design Study on Skirt Support of Lead-Bismuth-Cooled Fast Reactor Vessel under Seismic Loading
Authors: Huang Mei , Ma Juan , Tang J.N. , Yuan Hao
Published: August 2013

This paper is aimed at analyzing the structural response of reactor vessel for Lead-Bismuth-Cooled fast reactor with cylindrical and conical shell skirt support respectively with a consideration of a fluid-structure interaction in the event of the earthquake. For a seismic design, three kinds of semi-conical apex angles for conical shell skirt support of vessel are analyzed and it is found the conical shell skirt support exhibits the better performance especially when semi-conical apex angle α=15°in the views of the stress intensity and stability.
The Study on Development and Utilization of Coastal Environment
Authors: Li Jing , Chu Yu Juan , Han Xiao Qing , Gao Wei Ming
Published: August 2013

By the statistical data the present situation of development and utilization was analyzed in coastal zone of Hebei Province. The characteristics were that multiple utilization type and integral sea economic system and Development and utilization of regional resources plenty. At the meantime, there were also many problems, such as, degeneration of sea biological resource, the erosion of tourist beach and the worse station of marine ecological environment. The paper proposes some suggestions, enhancing marine environmental protection and improving the quality of the marine environment, enhancing the protection and restoration of coastal wetland ecological system, establishing coastal planning system and optimizing the structure of utilization, enhancing dynamic monitoring and adjusting the planning of coastal development.
Research on Dynamic Load and Static Load Combination Effects on the Railway Bridge and Piers Impact
Authors: Shen Yi Xiu , Ren Gao Feng
Published: August 2013

Using modal analysis to train and bridges and piers for dynamics analysis, we got a theoretical solution. Using wireless sensor network architecture monitoring system for Bridges and piers of the acceleration and the settlement monitoring, in considering static load loading situation, through contrast train before and after the settlement of piers the quantity change and Bridges and piers acceleration size, draw piers vertical stiffness of the bridge vibration impact is not significant. Study of the bridge piers and transverse vibration characteristics, it is concluded that the piers lateral stiffness is far less than that of the vertical stiffness, piers and bridges in transverse have larger dynamic response to produce.
Effect of Longyangxia Reservoir on the Variation of Water and Sediment
Authors: Hou Su Zhen , Guo Yan , Wang Ping
Published: August 2013

Longyangxia reservoir is the key project for the upper reaches of the Yellow River by possessing the interannual regulation capability. This paper analyzes the runoff sediment characteristics since the operation of the reservoir on the basis of the hydrological data before and after the operation of Longyangxia reservoir. The study result indicates that the variation characteristics of water and sediment after the operation of the reservoir mainly include sharply-reduced peak discharge, varied annual runoff distributions, reduced annual runoff coefficient of variation, obviously-reduced quantity of sediment, varied sediment runoff relation; the operation characteristics namely annual storage in flood period, level period discharge high-flow year water storage and low-flow year water supplement of Longyangxia reservoir are the key affecting factors for the variation of water and sediment.
Multi-Scale Analysis for Tensile Mechanical Properties of Carbon Nanotube Fibers by In Situ Raman Spectroscopy
Authors: Li Qiu , Kang Yi Lan , Qiu Wei
Published: August 2013

This paper presents an experimental study on the tensile mechanical properties of carbon nanotube (CNT) fibers by in situ Raman spectroscopy. The comprehensive spectral information, such as Raman shift, width and intensity, are recorded during the whole loading–unloading–reloading procedures of CNT fibers. Based on the experimental results, the elastic-plastic deformation evolution of CNT fibers are analyzed at multi-scale levels. It is found that the elastic deformation of the fiber is mainly attributable to the elastic stretching of the CNTs inside the bundles. And the plastic deformation is caused mainly by the slippages at the interfaces among CNTs inside the bundles. Meanwhile, the CNTs deform elastically during the whole loading–unloading–reloading procedures.
Information Extraction Method of SO2 Using Differential Optical Absorption Spectroscopy
Authors: Gao Ya Juan , Gao Ya Ni
Published: August 2013

The measuring principle of SO2, which is the main gaseous contaminants in flue gas, is given based on the differential optical absorption spectroscopy (DOAS). And the structure and composition of the measurement system are introduced. In the aspect of obtaining the absorption feature of measured gas, an information extraction method using statistics is presented for measuring the concentration of SO2. The nonlinear calibration and the temperature compensation for the system were executed. In the lab, the full scale error of the retrieving concentration is less than 0.5%FS. And the measuring result is-9.47mg/m3during the concentration of SO2is zero.
The Design and Implementation of Cable Condition Monitoring System
Authors: Yue Ling Ping , Zhang Hao , Gong Hao , Wei Fei Xiang
Published: August 2013

This paper describes the detail of design and implementation of cable condition monitoring system, including accessing and sharing of monitoring data, visualization, query, analysis and device management.
Performance Monitoring and Analysis of the Process Compressor
Authors: Xing Xue , Xing Wan Kun
Published: August 2013

This paper introduces the principles and methods of process performance of the compressor online test. The proposed monitoring system consisting of a computer and test analysis software, intuitive, real-time display the cylinder of transient pressure curve, and the curve real-time analysis of the performance of the machine and fault diagnosis.
Fault Diagnosis of Metro Vehicle Auxiliary Inverter Based on PSO-KPCM Algorithm
Authors: Ma Zeng Tao , Gao Jun Wei , Qin Yong , Yao De Chen , Zhang Bin
Published: August 2013

In this paper, the principle of kernel-based possibilistic clustering algorithm and particle swarm optimization algorithm are introduced and the application of the algorithms in fault diagnosis of auxiliary inverter is studied. Several common fault types are simulated by MATALB software. By initializing clustering center of samples based on PSO algorithm, calculating the final membership matrix and the final clustering center matrix based on the KPCM algorithm, the fault samples can be classified finally. The simulation results show that the PSO-KPCM algorithm can be used in the field of fault diagnosis. The PSO-KPCM algorithm even has better results and faster convergence rate than FCM algorithm.
Application of Multi-Sensor Information Fusion Technology in the Fault Diagnosis of Transformer
Authors: Ye Han Min , Xiao Zun Ding
Published: August 2013

The information fusion method is introduced into the transformer fault diagnosis. Through the sensor acquire transformer in operation of each state parameter, using two parallel BP neural networks to local diagnosis, with D-S evidence theory to global fuse the local diagnostic results. It realized the accurate diagnosis when transformer comes out one or a variety of faults at the same time. The experiments demonstrate that the credibility of diagnosis results are improved significantly, uncertainties are obviously reduced, which fully shows that the method is effective.
Robot Stereo Vision Guidance System Based on Attention Mechanism
Authors: Yang Long , Xiao Nan Feng
Published: August 2013

Add attention mechanism into traditional robot stereo vision system, thus got the possible workpiece position quickly by saliency image, highly accelerate the computing process. First, to get the camera intrinsic matrix and extrinsic matrix, camera stereo calibration needed be done. Then use those parameter matrixes to rectify the newly captured images, disparity map can be got based on the OpenCV library, meanwhile, saliency image was computed by Itti algorithm. Workpiece spatial pose to left camera coordinates can be got with triangulation measurement principal. After a series of coordinates transformation workpiece spatial pose to world coordinates can be got. With the robot inverse solution function, the robot joint rotation angle can be got thus driver the robot to work. At last, experiment results show the effectiveness of this method.
Control System of Low Carbon and Energy-Saving Radiant Heating
Authors: Ding Jin Hua , Hu Yu Jun , Wang De Quan , Gao Teng , Tian Ji , Lei Xiao Jing , Zong Jing Bin
Published: August 2013

According to the characteristics of large space building's heating, the effect in energy saving and environmental protection is analyzed on Radiant heating and Convection heating. Then Radiant heating consists of burners, radiation pipe, reflection plate, vacuum blowers and exhausted pipe. Based on the requirement of the radiation heating system, the radiant heating controller is studied and developed with C8051F340 MCU. The control principle, control hardware, control algorithm and control software process are described. Implementation of HMI is on the touch screen by industrial series RS232 interface.
Control Strategy of the DC Drive Systems Based on the State Error Port-Hamiltonian Theory
Authors: Shan Bing Qiang , Yu Hai Sheng , Teng Zhao Bo , Zhu Ning
Published: August 2013

A novel state error port-controlled Hamiltonian (PCH) system method is presented for speed control the direct current (DC) separately excited motor. The unity power factor regulation of three phase pulse width modulated (PWM) rectifier is also implemented. Then, the state error PCH system control theory, the PCH model of the PWM rectifier and DC motor are proposed. Moreover, the control algorithm of the duty ratio switch function is presented for the PWM rectifier. Theoretical analysis and simulation results show that the controller has good speed tracking and unity power factor control performances.
An Early-Warning Method for Agglomeration Detection in Gas-Solid Fluidized Bed Based on Hydromechanics
Authors: Guo Meng , Lin Wei Guo , Wu Hai Yan , Zhao Zhong , Liu Jin Wei
Published: August 2013

The occurrence of agglomeration in gas-solid fluidized bed can have a very negative impact on the efficiency of reactor operation. In order to overcome the agglomeration problem, an Agglomeration Early-Warning System (AEWS) is proposed. AEWS is able to detect the event of such undesired behavior and make it possible to operate more efficiently. The sensitivity and selectivity of AEWS is illustrated with experimental results. In order to minimize the false alarm, both moving time window method and minimizing value method were analyzed. The experimental results have shown that agglomeration can be recognized 30-60min earlier with AEWS than that with conventional methods based on changes in pressure drop or temperature difference over the bed.
Study on Energy Materials with an Important Source of China's Energy - Kazakhstan Crude Oil Pipeline Transportation
Authors: Liu Guo Ming , Zhang Lei
Published: August 2013

Kazakhstan is one of China's neighboring countries, there are, since the ancient times in an China commercial traffic line there are important geographical location, now China is growing stronger, Kazakhstan is China's friendly neighbors, Kazakhstan in central Asia fastest economic development, political situation is stable, social order relatively good, in mutually beneficial win-win policy under the guidance, and China in economic all aspects unity cooperation, China of Kazakhstan in the oil and gas domain occupies a very important position, at the same time, Kazakhstan has become an China's crude oil imports important channel, therefore, the study Kazakhstan of pipeline transport has very important significance.
Study of Fatigue Properties of PMMA with Typical Damage
Authors: Wang Jia Ying , Zhang Jian Yu , Shi Xin Hong
Published: August 2013

Fatigue properties of canopy PMMA with typical damage, which are two different depth scratches of 0.3mm and 0.4mm, are studied by experimental method. In order to gain the fatigue strength about the depth scratches of 0.3mm in the designated life, experiments based on up and down method had been conducted. The S-N curves of the PMMA about the depth scratches of 0.3mm were acquired based on three-parameter exponential function. Fatigue life of the PMMA with the depth scratches of 0.4mm under different stress levels is obtained by grouping method. Fatigue properties of the canopy PMMA of the two different depth scratches were discussed. The results of analysis showed that compared with the depth scratches of 0.3mm, fatigue properties of canopy PMMA with the depth scratches of 0.4mm decrease significantly.
The Application of Multi-Model Control on Vehicle Chassis Coordination Control
Authors: Li Guo , Zhang Wen Zheng , Hou Yan Jie
Published: August 2013

In this paper, we did research on the control theory of vehicle`s steering and braking systems. We used T-S fuzzy method to design the nonlinear model which is based on the vehicle`s steering and braking models. Then a cooperative controller was designed to coordinate the steering system and the braking system. On this way can effectively enhance the vehicle`s braking performance and steering stability. Finally, the results of simulation prove that the designed system has a satisfying tracking performance and strong system robust in diversified driving conditions.
Steady Motions Performance of an Underwater Glider with Pump on the Vertical Plane
Authors: Li Qi Jie , Gu Jian Nong , Zhang Zhi Hong , Wang Chong , Li Bao Ren , Gao Lei
Published: August 2013

The primary aim of research is to improve the speed of underwater glider to overcome the influence of ocean currents. In the paper, an autonomous underwater glider with pump was developed, and its vertical plane motion equations were established. In addition, the glider’s vertical plane motions were simulated. The results show, compared with no thrust, when the amount of volume change is 0.8L and the pump jet thrust is 15N, the glider’s resultant velocity and its horizontal velocity are double. When the pump thrust increases to 40N, the glider’s resultant velocity and its horizontal velocity are triple. It has also been confirmed that there is a best neutral buoyant pitch angle that can make the glider’s horizontal velocity reach the maximum in a different amount of volume change.
Deflecting Features of Gas from Double-Faced Deflector and Structure Optimization of Deflector
Authors: Shi Shao Yan , Jiang Yi , Dong Xiao Tong
Published: August 2013

This paper uses three-dimensional dynamical simulation of gas jet to demonstrate basic deflecting features of the double-faced deflector, during the launch process of the land-based missile with the vehicle-mounted vertically thermal launch. The calculation shows that the deflection of the gas flow is good, reducing knock-on effect and ablative effect on launch device. But wheels of the launch vehicle are still under visible influent from the gas flow. The paper optimizes the double-faced deflector and compares different suggestions in order to find a better deflection.
Study on Simulation and Performance of Open-Type Screw Discharging Structure
Authors: Li You Xiang , Gong Shu Guang , Lu Hai Shan
Published: August 2013

Compared with the closed screw conveyor, the discharging performance of open-type screw structure has a certain degree of uncertainty. The design of open-type screw structure is firstly presented in this paper. A novel open-type screw discharging structure is developed on the base of the requirement of industry, and structural parameters and operation parameters of screw are given. Based on the discrete element method, the simulation model of spiral discharging performance is built. The influence of the angular velocity of on open-type screw discharging performance is discussed. The analysis results show that the angular velocity of screw has a great influence on the discharge performance in the condition that other parameters remain unchanged. The presented method has an important guiding role and theoretical reference value to design of open-type screw discharging structure.
Study of Turbulence Characteristics in Different Advanced Vortex Combustor Structure
Authors: Wang Zhang Jun , Zeng Zhuo Xiong , Tu Guo Hui
Published: August 2013

Based on the idea of single cavity trapped vortex combustor, a advanced vortex combustor which is constitute by three blunt bodies and double concave cavity is proposed. And the interior combustor flow characteristics are analyzed. The results shows that the flow field characteristics changed a lot before and after combustor modification, and D2=20mm, D3=4mm are respectively the best modification scheme on the second and third blunt body.
Induction Motor Direct Torque Control Method of Fuzzy Adaptive
Authors: Fan Cong , Zhang Guo , Liu Yu Ping
Published: August 2013

This paper focus on the instability of asynchronous motor direct torque control system which caused by PID parameter changes. In order to improve the self-tuning capabilitiy of PID countroller, enhance the speed and stability of control system. fuzzy adaptive method was adapted to optimize PID parameter. Simulation results show that: this strategy improved the performance of direct torque control system significantly.
Study on Hydromechanics with Critical Instability Flowrate of Two Ends Supported Pipe Conveying Fluid
Authors: Bao Ri Dong
Published: August 2013

The expression of vertical vibration mode-function of fluid conveying pipe supported elastically on two ends was derived from the boundary conditions of similarly supported beam. The dynamic stability of pipe conveying fluid with the same supporting conditions was invesigated and the expression of its critical instability flowrate was obtained. The effects of fluid pressure and axial force of pipe section on critical instability flowrate were calculated and analyzed based on the eigenequation. The numerical results showed that the critical instability flowrate were proportional to axial drawn force, but proportional conversely to fluid pressure and axial pressed force of pipe section. The critical instability flowrate of fluid conveying pipe varied greatly with its supporting conditions. In order to improve its value at engineering application, the axial pressed force of pipe section should be avoided.
Preliminary Study on the Comparable Flow Pattern between Stented and Non-Stented Aneurysm at Hypertension Condition
Authors: Taib Ishkrizat , Osman Kahar , Hermawan Hendra , Abd Kadir Mohammed Rafiq
Published: August 2013

The presence of the vortex formation associated with high pressure gradient has aggravated the rupture at the aneurismal wall. In order to decrease the possibility of aneurysm to be rupture, device like wire-mesh called stent was inserted at the aneurysm bulge. This study was focused on investigates the hemodynamic factor especially pressure distribution toward the failure of the aneurismal wall. Computational fluid dynamics method has used to identify the influence of the hemodynamic factor at the aneurysm. The results of this study shown the slightly decrease of the pressure distribution after the insertion of the bare metallic stent (BMS). The results on non-stented aneurysm was depicted the strong vortex was dominated the entire region of aneurysm. The strength of the vortex also was seems very weak after the insertion of this stent. The flow visualization between stented and non-stented aneurysm has given a good features in deep understanding of hemodynamic effect on the aneurismal wall. From the observed, the insertion of the stent manages to reduce the stress that exerted to aneurismal wall as well as decreased the strength of the vortex formation.
Performance of Thermoacoustic-Standing Wave as a Power Generator
Authors: Surjosatyo Adi , Sentosa Irawan
Published: August 2013

This study is relating to analyze performance of thermoacoustic-standing wave. Stirling cycle thermoacoustic engine is developed conventional stirling engine. This system is more efficient than ordinary stirling engine because does not use a moving piston[7]. The engine uses thermal power to generate acoustic power. It consists mainly of three parts: a thermodynamic part consisting of a stack, two heat exchangers, and a thermal buffer tube; an acoustic network consisting of an acoustic compliance and an inertance; and a resonator. When thermodynamic part heated, it will generate sounds. The sounds will flow along cylinder tube. Some aspects can be analiyzed to determine performance of tharmoacoustic-standing wave. The effect of temperature difference, stack geometry, stack position determine performance of the thermoacoustic-standing wave. Some research show that acoustic power will increase with increasing of temperature at hot heat exchanger. And optimal position and geometry of stack will generated optimal acoustic power.
Investigation of Various Mixtures of HC290/HC600 Refrigerants in Adiabatic Capillary Tube Used in Split-Type Air-Conditioner
Authors: Sulaimon Shodiya , Aziz Azhar Abdul , Henry Nasution , Darus Amer Nordin
Published: August 2013

: According to Montreal Protocol, HCFC22 (hydro chlorofluorocarbon), a commonly used refrigerant in domestic refrigeration and air-conditioner, must be phased out owing to its environmental problem. Several natural substances including ammonia, carbon dioxide, water and hydrocarbon (HC) such as propane (HC290) and butane (HC600) and their mixtures have immerged as close substitute. Literature showed that pure HC refrigerant may not be suitable enough because of the difference in operating pressure and volumetric cooling capacity when compared with HCFC22. The main objective of this study is to theoretically investigate different ratios of HC refrigerants HC290/HC600 mixtures flowing through adiabatic capillary tube using homogenous model. In this study, the percentage by volume of HC290 was varied from 30 to 40 % in a step of 5%. The pressure at the two extreme ends and temperature along the capillary tube, using HCFC22 refrigerant, which was used as benchmark, was experimentally determined in the air-conditioning (AC) system. Comparing the model results with the experimental data showed that HC refrigerants HC290/HC600 in ratio 35%/65% gave 2.95% minimum error and thus it can be used as a substitute to HCFC22 in the split-type AC system.
Retrofitting R-22 Split Type Air Conditioning with Hydrocarbon (HCR-22) Refrigerant
Authors: Nasution Henry , Zulkarnain Abdul Latiff , Aziz Azhar Abdul , Mohd Perang Mohd Rozi
Published: August 2013

An experimental study to evaluate the energy consumption of a split type air conditioning is presented. The compressor works with the fluids R-22 and HCR-22 and has been tested varying the internal heat load 0, 500, 700 and 1000 W. The measurements taken during the one hour experimental periods at 10-minutes interval times for temperature setpoint of 20oC. The performance data considered where the evaporator cooling load, the condenser heat rejection, the electrical energy consumption, the refrigeration system temperatures, and the room temperature. And hence the Coefficient of Performance (COP) could be determined. The final results of this study show an overall better energy consumption of the HFC-22 compared with the R-22.
Distribution Optimizing Model of Benefits of Wind Power, Thermal Power Baling Delivery
Authors: Lei Tao , Tan Zhong Fu , Lin Li Qiong , Ju Li Wei
Published: August 2013

Wind energy curtailment to reduce wind power and solving wind power grid connected problem is the key element to increase wind power grid-connected and promote renewable energy development. Firstly, from the perspective of clean energy development ,utilization and increasing in wind farm investment income, this paper has analyzed the reason of wind energy curtailment, and summarized effective policies for the management of wind energy curtailment from all over the world. On this basis, this paper considered the loss of interest of thermal units during wind power peak regulation, in order to enhance the enthusiasm of thermal units to participate wind power and thermal power bale delivery, this paper has established wind power, thermal power bale delivery model of calculation of interest. From the numerical example, we conclude that after wind power and thermal power generation rights trading, the wind turbine will get higher revenue due to higher pool purchase price,while thermal power units are exposed to a loss because the tradeoff price is lower than the stake electrovalence.
Preparation of Mesoporous Hydroxylapatite Ceramics Using Polystyrene Microspheres as Template
Authors: Wen Fu Hua , Wang Feng , Gai Ying , Wang Mei Ting , Lai Qi Hui
Published: August 2013

Mesoporous hydroxylapatite was prepared by Liquid phase precipitation method, using Polystyrene microspheres as template. Polystyrene microspheres mixed uniformly with the prepared hydroxylapatite slurry, then the mixture dryed and sintered at reasonable temperature, mesoporous hydroxylpatite ceramics were obtained. The phase constituent was analyzed by X-ray diffraction (XRD) and the microstructure was observed under scanning electron microscopy (SEM). The results showed that the prepared mesoporous hydroxylapatite ceramics were of high purity and their pores were evenly distributed, with big pore 0.8-1.0 um and small pore 30-80nm in diameter.
Research on the Ballistic Model and Simulation of a Ejection Cylinder
Authors: Li Jun , Li Ming Jun , Wang Qi , Zhang Yu
Published: August 2013

To analyze the ballistic characteristics of ejection cylinder in falling stage, the dynamic characteristics of ejection cylinder and parachute are analyzed. Based on force bearing analysis, the particle ballistic model of ejection cylinder and parachute in falling stage are built, and the ballistic data is simulated. The results shows that the ballistic model is reasonable and better simulate ballistic characteristics of ejection cylinder in falling stage. The results can be used to ballistic calculation and determinate the fire data.
Study Formation Process of Cement Clinker Minerals by Using Calcium Carbide Slag as Raw Material
Authors: Wang Ya Li , Dong Shi Jie , Liu Lin Lin , Cui Su Ping , Xu Hai Bo
Published: August 2013

Calcium carbide Slag is one kind of industrial wastes from CaC2 hydrolysis reaction that will cause land pollution. In the research, calcium carbide Slag used as a substitute for limestone to produce cement clinker, which with a high portion of CaO content and then an excellent calcium containing raw material. As a kind of industrial wastes, the properties of Calcium carbide slag differentiate from that of natural limestone. The formation process of clinker minerals was studied by means of XRD. The results indicated that clinker minerals formation is similar to that from use of limestone. The generated clinker has a rational mineral composition and well developed mineral phase structure. But, there are many differences in decomposition temperatures between the calcium containing raw materials. Therefore, the carbide slag can be used as a substitute of limestone raw material to produce cement clinker.
Study and Manufacture of Magneto-Rheological Vibration Absorber Based on Internal Resonance
Authors: Deng Yu Chun , Bian Yu Shu , Gao Zhi Hui
Published: August 2013

In order to suppress vibration in flexible manipulators, a model of magneto-rheological vibration absorber based on internal resonance phenomenon between the flexible manipulator and vibration absorber is built. And the structure of magnetic circuit is designed, which is used to provide the applied magnetic field for the magneto-rheological elastomer. The total magnetic flux density in air gap of magnetic circuit is theoretically analyzed and verified via the real measured data. It is proved by frequency shift experiment on the beam structure platform that, the magneto-rheological elastomer has the adaptive ability of shifting its natural frequency as the applied electric current changes. Therefore, the magneto-rheological vibration absorber has a wider vibration absorption frequency.
Liquid Level Detection System for Automatic Pipetting
Authors: Na Yun Xiao , Zhu Lian Qing , Guo Yang Kuan
Published: August 2013

In molecular biology, analytical chemistry and medical tests, liquid level detection is the key to automatic pipetting. In this paper a liquid level detection system for automatic pipetting is studied. Liquid level is detected by capacitor sensor, the pepitting tip capacitor sensor model is proposed. The liquid level detection circuit based on Digital Signal Processor is assembled in automatic ELISA instrument. The experiment demonstrates the effectiveness of this liquid level detection system.
Influence of Revolving Angle Measure Precision and Actuator Performance on Control Force
Authors: Bi Yan Chao , Yao Xiao Xian , Song Xiao Dong
Published: August 2013

A control mathematical model in pitch and yaw direction is presented to apply on missiles controlled by double-channel with style canard. Based on the mathematical model, the influence of deflection angle measurement error and actuator performance on actuator control is analyzed. The results show that the measure error of lean angle and actuator delay will produce control coupling in pitch and yaw direction and that will reduce control efficiency.
An New Modified Automatic Panoramic Image Stitching Model in Fabric Defect Inspecting Area
Authors: Zhang Y.H. , Yuen C.W.M. , Wong W.K. , Kan Chi Wai
Published: August 2013

This paper presents some techniques for constructing panoramic image stitching from sequences of images captured by cameras from different angle in garment defects detecting area. The image stitching representation associates a transformation matrix with each input image. In this paper, we formulate stitching as a multi-image matching problem, and use invariant local features to find matches between all of the images. Our method is insensitive to the ordering, orientation, scale and illumination of the input images. It is also insensitive to noise images that are not part of a panorama, and can recognise multiple panoramas in an unordered image dataset. An improved SIFT(Scale Invariant Feature Transform) algorithm was used to locate the feature points in the scanned images targeting at the problem of automatically stitching of textile images which were scanned in divided pieces. RANSAC (random sample consensus) method is proposed to to estimate image transformation parameters and to find a solution that has the best consensus with the data. Techniques for estimating and rening camera focal lengths are also presented. In order to reduce accumulated registration errors, we apply global alignment (block adjustment) to the whole sequence of images, which results in an optimally registered image stitching. A local alignment technique is also developed which warps each image based on the results of pairwise local image registrations to compensate for small amounts of motion parallax introduced by translations of the camera and other unmodeled distortions.