bluuebunny/crossref_metadata_2025 huggingface dataset:
The Method of Dynamic Reserves Prediction for a Constant Volume Gas Reservoir
Authors: Zhang Lei , Zhang Lai Bing , Jiang Bin Quan , Liu Huan
Published: March 2013

The accurate prediction of the dynamic reserves of gas reservoirs is the important research content of the development of dynamic analysis of gas reservoirs. It is of great significance to the stable and safe production and the formulation of scientific and rational development programs of gas reservoirs. The production methods of dynamic reserves of gas reservoirs mainly include material balance method, unit pressure drop of gas production method and elastic two-phase method. To clarify the characteristics of these methods better, in this paper, we took two typeⅠwells of a constant volume gas reservoir as an example, the dynamic reserves of single well controlled were respectively calculated, and the results show that the order of the calculated volume of the dynamic reserves by using different methods is material balance method> unit pressure drop of gas production method >elastic two-phase method. Because the material balance method is a static method, unit pressure drop of gas production method and elastic two-phase method are dynamic methods, therefore, for typeⅠwells of constant volume gas reservoirs, when the gas wells reached the quasi-steady state, the elastic two-phase method is used to calculate the dynamic reserves, and when the gas wells didn’t reach the quasi-steady state, unit pressure drop of gas production method is used to calculate the dynamic reserves. The conclusion has some certain theoretical value for the prediction of dynamic reserves for constant volume gas reservoirs.
Analysis of the Modeling of Single-Phase Flow in a Perforated Pipe with Wall Fluid Influx
Authors: Zhang Quan , Wang Zhi Ming , Wang Xiao Qiu , Zhai Yu Jia , Wei Jian Guang , Gao Qing Chun
Published: March 2013

Over the past two decades, the modeling of flow in a perforated pipe with influx through orifices on the pipe wall has been recognized as an important issue especially in the field of horizontal wells. This article provides a careful analysis of the current models that are all based on laboratory experiments. Results show that the models can be mainly divided into two categories according to the number of openings perforated along the conduit surface . One is developed based on experiments with one single perforation, which includes Asheim model, Yalniz model and Zhou model. This kind of models could not be readily used to calculate the pressure losses of the actual flows such as horizontal wellbore flow without modification and thus has a poor applicability. Another is based on experiments with multiple perforations, which includes Siwon model, Yuan model, Ouyang model, Su model and Wang model. Although these models are appropriate for the pressure losses prediction along the completion, all of them are semi-empirical, which implies the huge complexities of developing accurate ones. In addition, Siwon model and Yuan model are relatively the most comprehensive models which could be used to account for the various factors affecting the flow behaviors in perforated pipes. The equivalent friction factor due to pipe wall perforations of Su model has a more theoretical foundation with more room for improvement. This analysis about the models regarding the pressure drops in perforated pipes indicates that more efforts should be made to acquire a better understanding of the complex flow mechanism and build a unified model which is more theoretical and robust.
An Investigation of a Novel Parallel Computation Scheme Designed for a Simulation of Amino-Acid Leaking Problem inside α-Al2O3 Nano-Channels
Authors: Lu Jun Feng , Zhang Hao , Fan Wei
Published: March 2013

Hemodialysis is a process to clean the metabolic wastes inside human body. Our previous researches on this topic fundamentally used contemporary numerical methods (such as CFD (computational fluid dynamics), MD (molecular dynamics), etc.) to study the ultra-filtration properties and made several progresses. However, our step-forward MD study on amino-acid leaking problem which natively exists during the hemodialysis process makes the numeral calculations more complicated. To control the heavy computation load during MD simulation, in this paper, a novel parallel domain separation scheme is proposed and its optimization method is further discussed. The unique feature of this scheme is that it introduces fibers as well as "compute shaders" into the parallel computation architecture. And the further application of this parallel scheme could form a new concept of MD simulation.
Electrokinetic Flow and Measure Method in Microfluidic
Authors: Gong Lei , Wu Jian Kang , Chen Bo
Published: March 2013

An analytical solution for pressure-driven electrokinetic flows in a narrow capillary is presented based on the Poisson–Boltzmann equation for electrical double layer and the Navier–Stokes equations for incompressible viscous fluid. The analytical solutions indicate that pressure-driven flow of an electrolyte solution in microchannel with charged solid wall induces a streaming potential, which is proportional to the flowrate and induces an electroviscous effect on flow. A device for measuring the electrokinetic flow rate and streaming potential is proposed.
Effect of Continuous Arterial Blood Flow of Intra-Aorta Pump on the Aorta - A Computational Study
Authors: Xuan Yan Jiao , Chang Yu , Gao Bin , Gu Kai Yun
Published: March 2013

In this study, a computational fluid dynamics (CFD) study based on a finite element method (FEM) was performed for the human aorta with four different flow time patterns (healthy to full intra-aorta pump support). Fully coupled fluid-solid interaction (FSI) simulation was used to investigate the flow profiles in the aortic arch and its branches where the maximum disturbed and non-uniform flow patterns, and the wall shear stress profiles on the same areas. The blood flow was assumed as a homogeneous, incompressible, and Newtonian fluid flow. Flow across four inlets of aortas was derived from a lumped parameter model (LPM). The inlet flow rate waveforms were divided by different blood assist index (BAI), and were calculated with the physiological information of a heart failure patient.
Taylor Series Numerical Method in Transient Heat Conduction Analysis
Authors: Zhao Li Bin , Li Yuan Wei , Liu Feng Rui
Published: March 2013

Taylor series numerical method (TSNM) is extended to the field of transient heat conduction. Theoretical description of TSNM for transient heat conduction problems is presented. Furthermore, the algorithm is realized and embedded in commercial software ANSYS®. If a lumped mass heat capacity matrix provided, the governing equation of transient heat conduction problems, which is a differential equation, will be solved by a series of recursion calculation of Taylor expanding coefficients. A typical transient heat conduction problem with analytical solution was discussed to verify the TSNM. At last, the TSNM is applied in the transient heat analysis of an all-solid fiber optic gyro (FOG).
Wrapping Angle Compensation Model of Cold Rolling Strip Shape Signal
Authors: Yang Li Po , Yu Bing Qiang
Published: March 2013

When wrapping angle of cold strip covering surface of shape detecting roll dynamically changes, online radial pressure of the shape detecting roll is changed too, and it seriously affects online shape detecting precision of cold strip. The cold strip online dynamic wrapping angle compensation model is established, and successfully applied in 1250 mm 6-high cold mill, remarkable results is achieved. The error between calculated values and measured values of total tensions is within 3%.
Dimension Analysis of Dynamic Response of Cylinder Shell under Impact
Authors: Wang Dao Rong , Liu Jia Qi , Li Hong Jie , Zhao Ju Yan
Published: March 2013

Dimension analysis is one of the important methods to study physical problems. Dynamic response of cylinder shell under impact is a pervasive problem in engineering domain. The paper took a cylinder shell as an objective to study the main factors of influence on dynamic response of cylinder shell under impact. Using theorem we obtained several different equations for describing the dynamic response of cylinder shell under different similarity conditions. The relationship of dynamic response of dimensionless independent variables versus dependent variables for cylinder shell is set up in the end.
Research on Vehicle Lifting Jack Structure Failure Trend on Basis of Static Strength Analysis
Authors: Xia Chang Qing , Sun Ying Shi
Published: March 2013

To ensure the safe use of vehicle lifting jack as process equipment for fabricating and producing railway vehicles, this paper analyzes on the working conditions of vehicle lifting jack and makes contact nonlinear finite element analysis on various typical working conditions. Through the analysis result on static strength thereof, the parts easily subject to dangers are located, and the failure trend of parts can be prejudged by locating the weaknesses, which guides for prejudging the failures in actual production and can prevent the occurrence of accidents.
Oscillation of Nonlinear Impulsive Hyperbolic Equations of Neutral Type
Authors: Ma Qing Xia , Zhang Lin Li , Liu An Ping
Published: March 2013

Oscillatory properties of all solutions for nonlinear impulsive hyperbolic equations with delays under the Robin boundary condition are discussed, several criteria are established by the mean method. The results extend the oscillation of impulsive differential equations to impulsive partial differential equations with delays.
Solutions of a Dynamics Nonlinear In-Plane Vibration of Suspended Cable Investigated by the Mixed Averaging Method
Authors: Wang Zhi Qian , Wang Lian Hua , Liu Qi Jian , Zhao Yao Bing
Published: March 2013

In this paper, the continuation technique is used to investigate the non-linear response of a suspended cable under harmonic excitation. A modified iteration procedure is applied to the nonlinear oscillator containing a quadratic term. From the formulated mathematical model of the suspended cable, the solution for the cable is obtained by means of the mixed averaging method. Also we can give the frequency simple with the modified iteration procedure. Moreover, the results obtained by this method and the numerical integration are compared. Also the offset is studied. Finally, the effects of the amplitude of the harmonic excitation on the suspended cable and the stability of the system are investigated.
The NC Power Supply Design of Large Current and Wide Frequency Pulse in Short Electric Arc Machining
Authors: Zhou Jian Ping , Liang Chu Hua , Xu Yan , Zhou Bi Sheng
Published: March 2013

There are a lot of ways to achieve large current pulse power supply, and the more common way is to adopt the inverter switching circuit to achieve pulse power supply. The core of the NC power supply design of large current and wide frequency pulse in SEAM is using two-stage modulation. Combined with inverter technology, DC chopper technology and NC technology, it not only can achieve the adjustability of the output pulse amplitude, but also can realize continuous adjustment of the output pulses and the duty cycle. The front stage of power supply uses DC/DC transformation circuit with the UC3879 integrated control chip as the core. With the microcontroller as the control core, the backward stage uses DC chopper circuit to achieve the NC power supply of multi-parameter adjustable output large current pulse.
The Transient Process Analyse of the Circuit with a Resistance-Capacitance Branch
Authors: Wu Bing , Wang Jian Liang
Published: March 2013

In this paper the auther made deep research on the principle and the transient process of resistance-capacitance over voltage protection circuit in different working condition during the electric locomotive running, and based on the analysis of the Circuit Transient Process, obtained the theoretic expressions of the voltage and the current of the resistance and the expression of the energy absorbed by the resistance during the working process. The research offers theoretical basis for design and improvement of the resistance-capacitance protection circuit.
Ytterbium-Doped Silica Microsphere Laser
Authors: Huang Yang Tang , Guo Chang Lei , Huang Yu , Zhang Pei Jin
Published: March 2013

An experimental of the laser emission in a set of Ytterbium-doped silica microsphere resonator (YMCs) with various concentrations of Yb3+ ions at continuous-wave 980-nm pumping is reported. The Yb-doped silica microsphere is fabricated with single optical tapered fiber, which dipped ytterbium nitrate solution, heating of electrodes discharged.The tapered optical fiber is fabricated by using a hydrogen flame heating and step motor pulling system. The microcavity is pumped with 976 nm continue laser by a tapered optical fiber coupled to the cavity . A multimode laser emission spectrum is observed with the spectral range of laser is 1070–1185nm.
Design and Realization of Universal Radar Signal Processing Software
Authors: Li Xiang , Du Jin Song , Liu Yi Yang , Bi Xin
Published: March 2013

As parallel signal processing tasks are more and more widely used, a universal, efficient and flexible radar signal processing software is urgently needed in the field of radar signal processing. Traditional development of parallel signal processing needs a large number of specialized programs, and must couple with the hardware platform. Therefore, the cost of development and promotion is quite large. The universal radar signal processing software designed in this paper is an integrated development environment to achieve fully graphical, generalized, and modularized development. The software is able to automatically generate codes. This function replaces traditional developing method that needs designers write a large number of programs. The above function significantly shortens the developing cycle and improves the developing efficiency. Besides, the software is of powerful debugging features. Furthermore, the software has excellent generalization and expansibility for hardware platform.
Improved GA-NFS-Based Decision Rule Acquisition in Route Selection for Public Transport Line
Authors: Tang Min An , Wang Xiao Ming , Yuan Shuang
Published: March 2013

Aimed at the difficulty of the route selection of urban public transport line, a new method was proposed for the improved genetic algorithm BP neural fuzzy system model and algorithm. For the problem of route selection, it is required to acquire evolution rule of system status from the changes of multiple environment variable factors. The BP neural fuzzy system model based on Mamdani inference was given, in order to overcome the existing limitations of BP neural network, it puts forward the thought of algorithm improved by GA. The algorithm as the foundation is applied in route selection of urban road public transport line, and the method’s usability is proven through simulation, calculation and analytical investigation of practical problems on the main lines of bus rapid transit the route selection.
Performance Test Functions of Genetic Algorithm
Authors: Yun Wen Xia , Ma Yong Jie , Chen Ying
Published: March 2013

Due to the disadvantages of genetic algorithm such as the weaker ability for local search, premature convergence, random walk and problems related, and so on , the design and improvement of the algorithm is an important research direction of genetic algorithm. And evaluating the performance of algorithm systematically and scientifically is the key to test algorithm whether good or bad .The common method used to evaluate algorithm is test function, however, the existing literature on the optimization algorithm has different methods to evaluate the performance of algorithm, and there is no uniform test criteria. As for those questions above, This paper studies test functions of genetic algorithm, and analyses characteristics of the main test functions, which can be used as the basis of selection algorithm test functions.
The Application Research on Discrete Hopfield Neural Network in Water Quality Evaluation
Authors: Wang Xiang Jun
Published: March 2013

It is difficult to evaluate water quality, because there are lots of influence factors. It presents discrete Hopfield neural network to evaluate water quality in this paper. The criteria of nutrition water quality used as training samples to train discrete Hopfield neural network, which is stored in discrete Hopfield neural network. The data in a monitoring point used as test samples to evaluate water quality. The experimental results show that discrete Hopfield neural network can evaluate water quality effectively. The classification results can be shown directly, and the running speed is faster than BP neural network. This method has important guiding significance and practical application value to other water quality evaluation.
A New Robust Color Image Watermarking Based on DWT and DRT
Authors: Teng Zi , Qiu Xiu Feng , Liu Jian Wei
Published: March 2013

The copyright protection of multimedia information is more and more important in the digital age, digital watermarking is a solution to address the topic. This paper proposes a new robust image watermarking scheme based on discrete ridgelet transform (DRT) and discrete wavelet transform (DWT). The scheme respectively embeds a copy of color image watermark into DWT domain and DRT domain, and uses a conception of semi-watermark. Experiment results demonstrate that the watermark can resist various attacks such as adding Gaussian or Union Distribution Noise, JPEG compression, brightness adjustment, contrast adjustment, altering color balance, lens blur, zooming in or out, cropping and some combined attacks etc.
Morphological Neural Network Based on QGA for Image Restoration
Authors: Ye Zheng Chun , He Chun Mei
Published: March 2013

A method based on quantum genetic algorithm (QGA) is presented to train and implement morphological neural network (MNN) in this paper. The algorithm adjusts the weights and biases of MNN and the QGA automatically determines the learning rate of the algorithm. Then the trained MNN is applied to image restoration. The image restoration simulation and a comparison with the median filter are shown in the end. We can see that the MNN is a quite good method applied to image restoration.
Motion Control in Laser Automatic Cutting System of Brand Pattern
Authors: Liu Xiang Yan , Wu Shi Lin
Published: March 2013

This article introduced the design of motion controlling module in the brand laser incising automatically system, and discussed how to conform the angle that is used in coordinates transform and the current location of laser head using a LED.This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.
A Precision Control of an Automatic Guided Vehicle Using Double Landmark Recognition in a Crematorium
Authors: Jeon Hye Gyeong , Hong Youn Sik
Published: March 2013

We deal with the problem of moving control of an automatic guided vehicle (AGV) in a specific environment, that is, a crematorium which has a narrow indoor environment. In such an environment, an AGV itself can transport a dead body to a designated furnace safely. A well-known method of burying guided lines under the floor is not proper to such an environment because its floors are made of expensive materials, i.e., marbles, and thus it has no flexibility. In this paper a new method of precision control of the AGV using infrared ray sensors is presented. With this approach, the AGV itself emits infrared rays to the landmarks adheres to the ceiling to obtain a moving direction and then moves to that direction by correctly recognizing them. One of the typical problems in a crematorium is that dead zone and overlapping zone may exist due to radiation and reflection of lights. To resolve this, an algorithm of recognizing double landmarks is applied to reduce its sensing errors. In addition, when the AGV changes its direction to enter the furnace, a precision control of the wheel moving trajectories of the AGV under acceleration and velocity constraints should be needed. Our proposed method formulates and simulates the desired trajectory of the AGV and then modifies it to compensate delay dynamics and vibration. The effectiveness of the proposed method was demonstrated in a real crematorium.
Concise Robust Control for MIMO System Based on Frequency Domain Analysis
Authors: Guan Wei , Su Zuo Jing , Zhang Guo Qing
Published: March 2013

In this paper, a concise nonlinear robust control scheme based on the frequency domain is proposed. Compared with the arbitrary selection of weighting function in classical H∞ mixed sensitivity robust control design procedures, the CGSA methods gives a relatively more straightforward and concise design procedure for MIMO robust control problem. In the simulations, the CGSA is applied to an integrated rudder and fin control loop to indicate that the integrated rudder and fin CGSA control scheme is very feasible for future practical application.
H∞ Controller Design for Networked Control Systems in Multiple-Packet Transmission with Random Delays
Authors: Wen Dan Li , Gao Yuan
Published: March 2013

Discrete-time NCSs in multiple-packet transmission with random delays were discussed. The random delays from the sensors to the controllers and from the controllers to the actuators were considered. A novel random delay model in multiple-packet transmission was proposed and the relationship of the delays and the system performance was studied. The state feedback H∞ controller can be constructed via solving a linear matrix inequality, such that the closed-loop system with random delays exponentially mean-square stable and with a prescribed H∞ performance bound. The result shows that an example presented here illustrates the effectiveness of the proposed method.
Weighted Multiple Model Adaptive PID Control with Crossover Frequency Shift Tuning for a Hydraulic Turbine Plant
Authors: Hamarasheed Chalang , Haris Sallehuddin Mohamed , Mohd Nopiah Zulkifli
Published: March 2013

Hydraulic turbines are known to have complex and highly nonlinear dynamics with some varying parameters, especially in the presence of large or abrupt disturbances. In this study, the weighted multiple model adaptive control scheme was used as a controller for a hydraulic turbine model, with the aim of providing desirable characteristics such as robustness and stability. The system of comprised four candidate plant models with four corresponding candidate PID controllers which were tuned according to the phase shifting method. The plant operation, subjected to both abruptly changing and smoothly changing load conditions, was simulated. From the results, it was found that the proposed controller showed very good performance for both types of disturbance changes.
Fast 3D Path Pre-Planning Method for UAVs
Authors: Li Shi Dong , Liu Song , Ai Qing , Li Jun
Published: March 2013

Path pre-planning generate the feasible conference path between start and destination for UAVs, it relates to restrictions from UAVs itself and environment information. Generally, the path is produced by searching in configuration space with some intelligent searching algorithms, the space is always so huge that it is difficult to obtain high efficiency, even lead to NP hard. We proposed a fast 3D path pre-planning method which plan 2D path firstly and then process height planning based on obtained 2D path, considering typical constraints such as turning angle, climbing/diving angle and static threat avoidance. Fast Marching Method (FMM) and Sparse A-Star (SAS) searching method are used in the course of 2D path planning and height planning respectively, Experiments showed that the proposed method generates path quickly, the obtained path follows terrain and avoids obstacles well.
Determined Key Distribution Protocol Using Orthogonal Product States
Authors: Li Xiao Yu , Zhao Qiu Yu
Published: March 2013

In this paper we provide a determined key distribution protocol using orthogonal product states in which people can share a predetermined string as the key. The fundamental principles of quantum mechanics guarantee that the protocol is unconditionally secure. There are no entangled states or complex quantum operations needed in our protocol. So it’s easy to carry out in practice and robust against possible noise and attacks.
The Path Planning Algorithm of Triangle Grid Scan for Localization in Wireless Sensor Network
Authors: Lin Yueh Chen , Liu Jing Sin
Published: March 2013

Localization is an important process in wireless sensor networks (WSNs). In this paper, we present a localization algorithm based on triangle grid scan (TGS) method. The objective of this research is to provide an affordable mean for localization using wireless area network Wi-Fi technology with mobile robot. Experimental study reveals that the proposed TGS mechanism effectively guides the mobile anchor to move along an efficient path.
Vehicle Terminal Remote Upgrade Based on GPRS
Authors: You Ning , Zhou Wei , Zhang Jin Ling , Ren Chun Xiao , Li Wen Liang
Published: March 2013

Based on difficulties of software upgrade and maintenance of vehicle terminals, this paper proposes a kind of hardware and software scheme using In Application Programming (IAP) which can realize vehicle terminals remote upgrade. The main function module and the interface circuit of the module with the MCU are designed respectively. Also, the software of the remote upgrade is introduced to realize the upgrading and resume broken transfer. The system controlling software is also designed to ensure the reliability.
Emergency Rescue Platform of Electric Vehicles Based on Natural Selection PSO
Authors: Liu Hua Feng , Chu Yi , Lu Zhi Yuan , Wang Ying Hui
Published: March 2013

Emergency rescue platform of electric vehicles based on natural selection PSO
Application of Text Mining Based on Neural Network Computing
Authors: Zhou Guo Hong
Published: March 2013

Today, numbers of documents that firms must process and with the extensive amounts of information available on the Internet, an automated intelligent method is needed to sort through all available documents or sites. It would be beneficial to start with grouping similar documents or sites together based on similarities. Classifying documents and sorting them into categories could be beneficial since in most cases, no one user would be interested in all the different categories of documents at the same time. Classifying a large number of documents would also make it easier to locate a specific document. In this paper, neural network computing based text mining (TM) and its application will be discussed.
Research of Case Retrieval Strategy in Case-Based Reasoning
Authors: Song Jian Hua , Wang Zheng , Zhang Lei
Published: March 2013

This paper put forward a new retrieval strategy which combines character field matching algorithm with the NNH in Case-Based Reasoning. The new retrieval strategy can reduce the times of symptoms match while streamlining retrieved result, and lower the impact of large symptom value difference in the result. The superiority of the strategy is verified by three target cases.
Design and Application of Risk Early-Warning System of Electric Power Engineering Projects - A Case Study of Combined Heat and Power Project in Western China
Authors: Miao Qing , Xia Zhen Tao
Published: March 2013

Based on the theories of fuzzy set and fuzzy conversion, the method of fuzzy comprehensive appraisal is a decision-making process which combines qualitative analysis and quantitative analysis and can be used to forecast risk of electric power engineering projects. Using the method of AHP to establish risk early-warning indicators system and method of fuzzy comprehensive appraisal to establish risk early-warning model, the paper constitutes risk early-warning system of electric power engineering projects. A case from western China is applied to prove the validity of the risk early-warning system.
Risk Factor Identification and Classification of Flight Safety Based on Fault Tree Approach
Authors: Wu Peng Fei , Duanmu Jing Shun , Du Ji Yong , Yang Ji , Zhang Chao
Published: March 2013

Flight safety is the basis of the Air Force combat effectiveness. We propose a fault tree approach to qualitatively identify risk factors that affect flight safety. Risk factor identification index system of flight safety is established, and the risk coefficient method is developed to identify the risk factors quantitatively. We finally study an example of a Military Region, the risk factors of which are from different sources, and establish the classification system. The results can provide an objective basis for headquarters offices and flight safety management department policy formulation, which can lay the foundation for further development of flight safety risk assessment.
A Synthetic Evaluation Method of Cell Formation Schemes
Authors: Wang Jian Wei , Zhang Jian Ming
Published: March 2013

A decision support system based on scenario for multi-attribute selection of cell formation schemes is developed. The system combines fuzzy set theory and group decision with the AHP to decrease the influence of decision makers’ subjective preferences and control the uncertain and imprecise variations during evaluation process. The importance weights of different criteria and the ratings of various alternatives under different criteria are evaluated in linguistic terms represented by fuzzy numbers. The intangible criteria and criteria weights are determined by group decision which can integrate all decision makers’ subjective opinions based on different scenarios. Besides, fuzzy value of each of the alternatives is computed by making use of standard fuzzy arithmetic. The degree of confidence and risk index are also joined, so that decision makers can adjust them to match real context. Finally, a case of individual selection about cell formation is given, and the results demonstrate the proposed approach is both effective and robust.
Research on Open Numerical Control System Based on Collaborative Design and Development
Authors: Yuan Xiao Ming , Zhao Yan Fang , Shi Shun Yi , Wang Hong Yu
Published: March 2013

The characteristics of open CNC system and the current several open CNC system models are introduced in this paper. In order to overcome the contradiction between the frequent changes demand and the closure of the traditional system, the open CNC system software and hardware architectures were investigated based on web-collaborative design and development, which improve the system development efficiency. Using the Windows XP operating system as a software platform, the Visual C++ 6.0 object-oriented programming language is adopted to design the CNC drilling control software based on the "PC + NC" the model and modular co-design methods, which improve the openness of the CNC system.
The Calculation and Analysis of the Yacht Engine Cooling Water Jacket Based on the CFD Technology
Authors: Jin Yu Gang , Yang Jing , Li Ke
Published: March 2013

The paper takes a yacht engine as the research object. Build a three dimensional model of one yacht engine cooling water jacket through the Pro/E software. Make analysis of internal flow field of cooling water distribution, pressure loss, and so on, with the computational fluid dynamics software—STAR-CCM+. Find problems in the cooling system, and propose improvements for the engine cooling water jacket and evaluate the program and conduct a comparative analysis of the original program.
The Method of Computing the Thermal Conductivity of Heat-Insulation Oil Pipe Coupling
Authors: Liu Li Jun , Yu Peng , Xu Ying
Published: March 2013

Based on the inverse problem theory of heat conduction, thermal conductivity of heat-insulation oil pipe coupling is researched in the paper. The finite volume method is extended to solve the direct problem, and the 0.618 method is used to solve the inverse problem by optimizing the objective function. The results show that by using the method, taking the outer wall’s temperature as the sample indicators, the thermal conductivity and the temperature distribution of heat-insulation oil pipe coupling and the temperature distribution of heat-insulation oil pipe can be obtained easily and accurately.
Complex Simulation Model of Microturbine Unit
Authors: Kolka Zdenek , Poledno Martin , Biolkova Viera , Biolek Dalibor
Published: March 2013

The paper deals with a mathematical model suitable for the hardware emulator of a microturbine power unit, which serves the design, optimization, and verification of control equipment. The emulator interface signals mimic the operation of a real turbine including the electrical parameters of interfaces. A system of algebraic-differential equations representing the turbine model is formulated such that it allows applying an explicit solver with a predictable amount of operations to obtain the next time step, which is important for the real-time simulation. The model includes the starter motor, generator, gearbox, and single-shaft gas microturbine. In addition to the normal operational performance the instrument allows simulating various faults.
Cage Instabilities in High-Speed Ball Bearings
Authors: Ye Zhen Huan , Wang Li Qin
Published: March 2013

The dynamic model of the cage in high-speed ball bearing was developed according to the geometry and force relationship between bearing elements. Based on this dynamic model, cage instability was researched through mass center whirl. The effect of clearance ratio, load and bearing rotation speed on cage instability were studied by taking type 7004 angular ball bearing as an example. The results shown that the increase of clearance ratio and radial load makes cage stability lowered, and the cage stability could be enhanced by increasing the axial load and bearing rotation speed.
The Simulation Study of a New-Type Frictionless Pneumatic Cylinder
Authors: Zhu Xiao , Tao Guo Liang , Qian Peng Fei , Meng De Yuan , Zuo He
Published: March 2013

A new-type frictionless pneumatic cylinder with an aerostatic bearing as its piston can decrease the friction significantly. The stability and the leakage of this cylinder mostly depend on the radial load carrying capacity(RLCC) and the air consuming of the bearing. In order to make a better use of this cylinder in pneumatic servo systems, a simulation study on the influence of the structural parameters and time-varying surrounding parameters to this cylinder was carried out on the basis of a numerical solution method based on finite element method(FEM) which was constructed to solve Reynolds equations in this paper. Simulation shows that introducing a recess chamber at the end of the orifice hole can increase the RLCC significantly and smooth the sharp distribution of the pressure around the orifices in the air film, which makes the bearing working more stable; the time-varying parameters have a combined effects on the performance characteristics of the bearing.
Investigation of Chelating Agents on Structural and Optical Properties of Mg(Zr0.05Ti0.95)O3 Thin Film on ITO/Glass Substrate
Authors: Tseng Ching Fang , Lee Chih Wen
Published: March 2013

Optical properties and microstructures of Mg(Zr0.05Ti0.95)O3 thin films prepared by sol-gel method on ITO/glass substrates at different amount of chelating agents and annealing temperatures have been investigated. The relative intensity ratio values of the peak Mg(Zr0.05Ti0.95)O3 thin films, secondary phase of MgTi2O5 and grain growth were depended on the amount of chelating agents and annealing temperature. In the optical transmission spectra, the Mg(Zr0.05Ti0.95)O3 thin films present high transparency (over 60%) in the visible region of the spectrum. The dependence of the optical properties and microstructure characteristics on thermal treatment was also investigated.
Controlled Crystallization and Characterization of Li2O-Al2O3-SiO2-P2O5 Glass-Ceramic
Authors: Zhao Na
Published: March 2013

the controlled crystallization and characterization of Li2O-Al2O3-SiO2-P2O5 glass ceramic by XRD and numerical calculus. The results indicate that the controlled model of crystallization is the process though controlling the growing size of crystallization grain by forming residual glass phase with high melting point, and proper high-melting supplement such as Y2O3、Al2O3 can reduce crystal grain size at the same time that does not change nucleation quantity. At last, transparent glass-ceramic with little crystal grain can be obtained by the theorizing analytic model.
Research on Dynamic Response Time of Magnetorheological Fluid Dampers
Authors: Zhang Jin Qiu , Zhang Lei , Yue Jie , Gao Yong Qiang , Peng Zhi Zhao
Published: March 2013

In this study, one type of magnetorheological fluid dampers (MRD) used in tracked vehicle is chosen as a research object. Firstly, the dynamic response process is analyzed and the dynamic response time of MRDs is defined. In this study, we consider that the dynamic response time of MRDs includes four components, i.e. the electrical power response time, the electromagnetic response time, the response time of magnetorheological fluid (MRF) and the structure response time. The electrical power response time is tested and the electromagnetic response process and the electromagnetic response time of the MRD are analyzed through the method 3D magnetic finite element analysis. Lastly, the response time of the MRD used in tracked vehicle in various working conditions is tested by MRD response time testing system. With the comparison between testing data and analysis of the electromagnetic response process, we can conclude that the structure response time and the electromagnetic response time occupy the largest proportions of the dynamic response time of the MRD and the feasible methods to shorten the response time is to increase rigidity of the MRD system and reduce the eddy effect.
Simulation of Thermal Conductivity of Sandwich Composite
Authors: Yang Fang Qin , Jin Yang Fu , Qian Xin
Published: March 2013

Heat conductive materials, which are widely used in the fields like electronic information, electrical engineering and aerospace, are required high thermal conductivity, excellent electrical insulation, corrosive resistance, chemical stability and so on. In this paper, steel/unsaturated polyester (UP) sandwich composite is designed to use as heat conductive material. The capacity of composite thermal transmission with steel wire arrangements in longitudinal and transverse directions are analyzed by software ANSYS. Finally, equivalent thermal conductivity of composite is calculated. The results show that capacity of composite’s thermal transmission increases quickly with increasing number of steel wire in the longitudinal direction，but it increases slowly with the increasing number of steel wire in the transverse direction.
Medical Robot in General Surgery: The State of the Art
Authors: Lv Yi , Dong Ding Hui
Published: March 2013

Operation is the most important component in surgical treatment. From the conventional open operation with big incisions, said “Big scar, Big surgeon”, to the small invasive surgery, such as laparoscopy, surgeons always try them best to pursue the fabulous operation for the patients. It means that the sufferer receive the optimized prognosis, while suffering from the smallest invasion. It is not the impossible dream since the combination of surgery and engineering. Due to the interdisciplinary cooperation, the medical robot comes to the vision of current medicine. Since the robotic technology shares the superiorities of stability and accuracy, there is no doubt that the medical robot is the key to help the surgeons to open the fabulous operation’s door. In this paper, we will focus on the application of the medical robot in general surgery.
Research and Application of Vibration Control for Coupled Structures System
Authors: Liu Jian Jun , Zhu Kuan Jun
Published: March 2013

Over the past three decades, coupled structures vibration research has steadily gained momentum from proposed research concepts to actual implementation. Numerous passive and active control strategies have been considered for low- to high-rise buildings. This paper contains a literature review of coupled structures control, and reviewed from the aspects including neural control method, laboratory test, and engineering application. The existing problem and the future developing in application are also summarized respectively.
Analog Circuits Test by Using Principal Component Analysis
Authors: Zhang Chao Jie , Chang Guang Hui
Published: March 2013

In view of the difficulties caused by determining threshold for analog circuits test, a method based on principal component analysis (PCA) of node voltages was proposed to overcome these difficulties. At first, the principal component model of fault-free circuits was constructed. Then the circuits-under-test was compared with the principal component model to calculate the statistic for fault detection. The proposed method was used to test the output signal amplifying circuit, which is used in the ultrasonic liquid sensor. The testing results show that the PCA based method has a higher sensitivity than other test methods. And the proposed method can overcome the difficulties in determining threshold by the expert’s empirical knowledge. These make it a suitable candidate for analog circuits test.
Time-Frequency Analysis System of Rolling Element Bearing Based on Virtual Instrument
Authors: Yu Xian Jun , Guo Yu , Guo Jun , Li Yun
Published: March 2013

Rolling element bearing (REB) is one of important components in the condition monitoring and faults diagnosis of machinery. In this paper, a REB fault diagnosis system is presented, which is developed by using LabVIEW. In the system, vibration signals are picked by acceleration sensors and acquired by NI USB data acquisition card at first. Then, the fault diagnosis can be performed in the time-frequency domain by various time-frequency methods. The experiments show that the presented system can be used to extract the bearing fault features and diagnoses the failures effectively.
Automatic Detection for Defects of Railroad Track Surface
Authors: Guo Long , Zhang Jun , Chen Zhe , Sun Liang , Ge Jia , Lü Kun Lin , Dai Guang Yu
Published: March 2013

Rail track surface defects detection is an important part of the monitoring of railroad safety. In this paper, rail track images obtained by detection system of rail track surface image are processed. Firstly, the Hough transform is applied to process the images of the track surface to locate and extract the image of the track surface, which overcomes the influence of incline and unfixed width of track surface images caused by vehicle vibration. Secondly, improved Sobel operator and area filter are used together to extract track surface defects from the original images. Finally, the defects images are classified based on circularity and length-width ratio of minimum enclosing rectangular of defects images.Results of experiments show that the algorithm can identify and classify the defects images of track surface. The minimum detection region in rail track surface is 0.0068 cm2.
Baggage Specification Detection Based on the Binocular Vision
Authors: Gao Qing Ji , Yang Lu
Published: March 2013

To the baggage specification automatically detection problem of self-service bag drop system, a baggage size detection algorithm based on stereo vision is proposed. The algorithm is based on binocular stereo vision measurement principle. Firstly, the canny edges of baggage image are extracted as the feature points. With the disparity gradient constraint and epipolar constraint, Stereo matching algorithm based on edge features is proposed, meanwhile, the two images play a symmetric role to ensure the reliability of matching in the matching process. The coordinates of the three dimensional points are derived with approximation of the middle point of the common perpendicular line in different planes. Experimental results show that the proposed algorithm can detect the baggage specification with appropriate accuracy.
A Compact Plasma System for Experimental Study
Authors: Sahoo Gourishankar , Paikaray Rita , Samantaray Subrata , Patra Dheeren Chandra , Sasini Narayan Chandra , Ghosh Joydeep , Chowdhuri Malay Bikash , Sanyasi Amulya
Published: March 2013

A compact plasma system is set up at Ravenshaw University, India. The plasma system consists of a curved vacuum chamber which is nothing but a part of a toroid (θ=700) having minor radius, r= 0.3 m and major radius, R= 0.5 m, vacuum system, electromagnet, gas injected washer stacked plasma gun to produce plasma blobs/filaments, pulse forming network to energise plasma gun, diagnostic tools like electric probes, magnetic probes, spectrometer, high speed CCD camera, digital pulse/delay generator to synchronise the diagnostic tools. A pair of copper coil is wound over the chamber and capacitive pulse is fed to the coil to produce non-uniform magnetic field inside the chamber. The gas injected washer stacked plasma gun is a mono-anode - multi cathode system having five cathodes made up of brass and an anode made up of copper. The gun impedance is ~ 15 Ω. The pulse forming network (PFN) is Guillemin E type which consists of capacitors having equal capacitance 5.5 μF and inductors having equal inductances 1.5 μH. The pulse width of the PFN is ~ 7.6 μs for a seven stage network, as tested with known resistive circuit. Magnetic probes are designed and calibrated using a Helmholtz coil to map the radial magnetic field profile of the plasma chamber. Electric probes like Langmuir triple probe, velocity probes are designed to measure plasma parameters like blob velocity, density, temperature etc. Emission spectroscopy method is used to identify charged species inside the plasma. High speed CCD camera is used to interpret the structure of the plasma. A digital pulse/trigger generator is used to synchronise the CCD, spectrometer and switching thyristor etc. Preliminary results are also reported.
Fault Diagnosis for Wind Turbine Gearboxes Based on EMD and the Energy Operator
Authors: Zhong Xian You , Zeng Liang Cai , Zhao Chun Hua , Liu Xian Ming , Chen Shi Jun
Published: March 2013

Wind turbine gearbox is subjected to different sorts of failures, which lead to the increasement of the cost. A approach to fault diagnosis of wind turbine gearbox based on empirical mode decomposition (EMD) and teager kaiser energy operator (TKEO) is presented. Firstly, the original vibration signal is decomposed into a number of intrinsic mode functions (IMFs) using EMD. Then the IMF containing fault information is analyzed with TKEO, The experimental results show that EMD and TKEO can be used to effectively diagnose faults of wind turbine gearbox.
Design, Installation, Analysis and Testing of In-Vessel Magnetic Coils on J-TEXT Tokamak
Authors: Li Quan Lin , Ding Yong Hua , Rao Bo
Published: March 2013

In this paper, a set of 12 in-vessel resonant magnetic perturbation coils are designed for the J-TEXT to investigate the interactions between external resonant magnetic perturbations (RMPs) and a tokamak plasma. Since the coils will be fed with AC 10kA/10kHz and mounted inside the vacuum vessel where the pressure is E-7 Pa and the center-line field reaches 3 T, the coils design adopted and installed is a water-cooled hollow copper conductor insulated with polyamide and cured epoxy resin, and then housed inside a welded stainless steel jacket that forms a vacuum boundary. A solution of how the coils are connected to the power supply outside the vacuum in a limited space is also given in this paper. The primary challenge in the design of these coils is dressing the copper conductor with stainless steel jacket by welding without overheating the polyamide and cured epoxy resin insulator.