bluuebunny/crossref_metadata_2025 huggingface dataset:
The Fundamental Characteristics on Particle Size Distribution of Drilling Rock-Cuttings
Authors: Yi Song Lin , Wang Zhi Ming , Yi Xian Zhong , Chang Wei
Published: March 2013

The properties of particle size distribution of rock cuttings and its shape characteristics are the most important parameters to petroleum drilling engineering. The samples of rock drill-cuttings are collected from 7 wells within the depths of 3500 m in Liaohe Oilfield of China. The particle size distribution laws of these rock samples with the average diameter over 74 μm are analyzed. The result shows that the drill cuttings feature obvious sheet shape and the size distribution curve of the particles is mainly related to the formation rocks and drilling bits. While drilling at the well depths of between 0 and 2000m by the cone bits, particle size distribution of drill cuttings has a form of approximately power function, the probability particle diameter being 8.50～9.27 mm. Drilling at the depths of between 2000 and 2800 m by the cone bits, the size distribution of cuttings has a form of nearly function, the probability particle diameter being 3.04～4.67 mm. Drilling at the depths under 2800m by PDC bits, the size distribution has a form of nearly the Rayleigh distribution, the probability rock diameter being 0.91～0.94 mm.
Flue Gas Turbine Fault Analysis and Improvement Measures
Authors: Cao Hui , Liu Yan , Lin Chang Ji
Published: March 2013

The flue gas turbine discussed in this article have relatively backward pneumatic design, low operating efficiency, as well as problems of vibration, catalyst accumulation and fouling etc. It cannot realize better generating power effect because of short running cycle, high failure rate, and low recovery of heat and pressure energy generated of high temperature flue gas. To solve the above problems, this article proposes failure analysis. Flue gas turbine problems appear for the main reasons: the steam of the regeneration standpipe reach the regenerator, lead to catalyst breaking and give rise to a large number of catalyst fines, which causes the third cyclone separator blocked and the flue gas turbine fouled. Then, repair the leakage point of regeneration standpipe, maintain smooth operation,and transform leaf type of flue gas turbine. The flue gas turbine restored power generation status after overhaul. achieve the purpose of high efficiency and long-term stable operation.
Based on the Ant Colony Algorithm TSP Optimization Simulation
Authors: Deng Lei Lei
Published: March 2013

Ant colony algorithm ( ant colony algorithm, ACA ), Also known as ant algorithm, is a diagram used to find the probability of path optimization algorithm. Ant colony algorithm is a novel simulated evolutionary algorithm , A preliminary study shows that the algorithm has many good properties. Currently a number of ant colony algorithm has been optimized combination of problems, such as TSP, QAP, JSP, VRP and other issues demonstrated its outstanding prospect. This paper is trying to optimize the existing combination of ant colony algorithm based on the reality of defects, from the pheromone update useless to achieve repetition rate of the control nodes, thereby enhancing the ant colony algorithm in the iterative process of updating optimum capacity. For the same number of iterations to find the path shorter, less costly rules. And in VC++ program to validate the optimal solution of TSP to solve practical problems.
Existence and Stability of Periodic Solution for Impulsive Hopfield Cellular Neural Networks with Distributed Delays
Authors: Zhang Lin Li , Fan Rui Li , Liu An Ping , Xiao Li
Published: March 2013

As an important tool to study practical problems of biology, engineering and image processing, the cellular neural networks (CNNs) has caused more and more attention. Some interesting results about the existence of solution for cellular neural networks have been obtained. In this paper, by means of iterative analysis, the existence of periodic solution and the uniform stability of the equilibrium point of impulsive Hopfield cellular neural networks with distributed delays are considered. Some new results are obtained.
The Analysis and Improvement of Inverse Problem Simulated Annealing Algorithm about Concrete Temperature Field
Authors: Wang Lun Yan , Guo Lei , Yuan Hui Min
Published: March 2013

The thermodynamic parameters and boundary conditions is one of the important factors affecting the simulation precision of concrete temperature control, and through the test way obtaining these parameters demands high cost, and often works with practical mismatch. This paper introduces the simulated annealing method, analyse and improve the simulated annealing method . The results show that, the improved of simulated annealing algorithm can be used for the study of concrete temperature field inverse.
Three-Dimensional Modeling of Open-Pit Based on AutoCAD and its Application
Authors: Liu Guang Wei , Zhao Hao , Fu En San
Published: March 2013

Three-dimensional geological model of open-pit is an information platform in the construction of digital mine, which plays a significant role in the engineering design and manufacturing management of open-pit. In the AutoCAD platform, take an open-pit for example, it is required to construct a geological database, to construct fault wire-frame model according to the ore body lines, to construct a terrain model according to the present situation map of stope and topographic contour map, to construct coal solid model according to the borehole data and interpolation points, and realize a visible display of a three-dimensional geological model for the open-pit; to construct a block model according to the coal & rock solid model, and add the attribute and assign to it, and then apply it to the calculation of stripping and mining quantities of open-pit. Compared with traditional calculation method, this method is simple in operation, which enhances its calculation speed and precision.
Three Remodeling of the Optical Nerve Head Including Retinal Blood Vessel Based on Live Animal Experiment
Authors: Qian Xiu Qing , Zhang Kun Ya , Liu Zi Hang , Liu Zhi Cheng
Published: March 2013

With increasing evidence that vascular risk factors play a role in the development of glaucoma, it is critical to be familiar with factors related to intraocular blood flow. It is important to obtain that the modal of the optical never head including the retinal blood vessel. The images optical never head of a cat using the optical coherence tomography images were obtained. Then, the three modal of the optical never head and the retinal blood vessel were reconstructed using the technology of image process, respectively. The three-dimensional modal of optical nerve head including retinal blood vessel could get using Boolean Operation.
Indicators and Methodologies of Energy Efficiency in China
Authors: Wang Bin , Wu Chun You
Published: March 2013

The inconsensus in the definition and indicators of energy efficiency has caused great difficulty when evaluating energy efficiency. The research, based on a review of literature focused on China’s energy efficiency, discussed the indicators and evaluation models of energy efficiency. Current studies exhibited many input indicators but output indicator focused on GDP, neglecting the environmental outcome. DEA model is proved to be a more reliable and practical model which can illustrate the multiple elements involved in the use of energy. A common limitation found in the previously advocated DEA models in energy efficiency analysis relates to the absence of undesirable output in the production process. The future work should be done in the framework of total-factor analysis taking account of both desirable and undesirable outputs.
Primary Physical-Mechanical Characteristics on Marine Sediments from Zhoushan Seas in Sino Mainland
Authors: Wang Ya Jun , Jin Feng , Zhang Chu Han , Wang Jun
Published: March 2013

Marine sediment laboratory test model was developed by excavation on site and application of GDS triaxial loading system. The grading characteristics on representative soft marine soil from Wushitang (MS1) and Dongsha Seas (MS2) were studied and the key evaluating indicators, i.e., curvature coefficient CC and non-uniform coefficient Cu were analyzed. Based on the systematically physical-mechanical test data, the constitutive model on step deviatonic-stress and strain development was researched. The result shows the exponential mapping relationship is applicable for stress-strain constitution. The fluid-solid coupling non-linear function was established by spatial pore pressure surface fitting. The key consolidation treatment for soft marine sediments was discovered.
Measurement and the Distribution Law of In Situ Stresses of Tingnan Coal Mine
Authors: Wang Jiong , Liu Yang , Guo Zhi Biao , Pang Jie Wen , Liu Bin
Published: March 2013

In order to study the distribution law of in situ stress field of Tingnan coal mine, 4 points of in situ stress measurement were carried out in underground roadways at the -450 m level with the overcoring method. The KX-81 type cell was used to measure the 4 points of in-situ stress. According to the analysis and calculation of the measurement result, the dominant factor of the in situ stress field in Tingnan coal mine at the depth of -450m is horizontal tectonic stress.
Study of Variation of Soil Stress State Based on the Curve of Normalized Strain- Pore Water Pressure
Authors: Yang Gang , Yang Qing , Liu Wen Hua
Published: March 2013

The cyclic behavior of normally consolidated silty clays was investigated by conducting a series of cyclic simple shear tests on one-dimensionally and isotropically consolidated reconstituted samples. The critical cyclic stress ratio was obtained by the normalized axial strain. Based on hysteretic curve of pore water pressure versus strain, dynamic characteristics of silty clay were investigated. The results showed that with increasing of cyclic loading, soil stress state can be divided into steady state, critical state and failure state based on the critical cyclic stress ratio. The hysteresis curve of pore water pressure versus strain was divided into two parts by cross point A. Compared with two parts, the variation law was obtained. When the upper part area was bigger than the lower part area, pore water pressure and axial strain continuously increase with cycle number; when the upper part area was smaller than the lower part area, pore water pressure and axial strain tended to be steady with cycle number.
Evaluation on the Application of Two-Fluid Multiphase Model to Supercavity
Authors: Zhou Jing Jun , Dong Chun Peng , Xiang Qing Rui
Published: March 2013

The lubrication of external liquid with supercavity has been the goals of specialists for many years. Either ventilated cavity or natural cavity is firstly related to multiphase flow. In this paper, in order to quantitatively predict the cavitating flow especially the ventilated supercavity and understand the structure of flow field in the cavity, two kinds of multiphase model including the homogeneous flow model and the two-fluid model were adopted separately. Besides, SST and DES turbulence model are used for steady and unsteady simulations. By comparing the simulating results with experimental results in water tunnel, the two-fluid model was proved to have the high accuracy in predicting the ventilated supercavity including the cavity shape and lift coefficient of the vehicle. On the other hand, for natural cavitation, the mixture model and the two-fluid model have little difference in predicting the pressure coefficient, however, the two-fluid model can give more detailed flow field.
The Zero-Mach Limit of Compressible Euler Equations
Authors: Wang Shu
Published: March 2013

The aim of this paper is to prove that compressible Euler equations in two and three space dimensions converge to incompressible Euler equations in the limit as the Mach number tends to zero. No smallness restrictions are imposed on the initial velocity, or the time interval. We assume instead that the incompressible flows exists and is reasonably smooth on a given time interval, and prove that compressible flows converge uniformly on that time interval.
Research on Aerodynamic Characteristics of a Simplified SUV Model
Authors: Hu Xing Jun , Liao Lei , Wang Jing Yu , Fu Li Min
Published: March 2013

The aerodynamics characteristics of square Mira model were researched by simulation, the drag coefficient and the aerodynamic characteristics around model were achieved with analysis of velocity and pressure distribution. Based on results, the angle of rear wind window, the angle of underbody diffuser and the front transition radius were changed, the drag and lift coefficients were achieved. The conclusions provide reference for how to reduce drag coefficient of SUV
Numerical and Experimental Simulation on Aerodynamic Character of Crescent-Shaped Iced Conductor
Authors: Li Xin Min , Zhu Kuan Jun , Liu Bin
Published: March 2013

The dynamics force of iced-conductor is the driving force of galloping, its variation is depended on the aerodynamic character of iced conductor. The aerodynamic character of iced conductor is the key factor of galloping of iced-conductor, but the result of theoretically analysis and numerical simulation isn’t suited for the requirement of transmission line project. In the paper, basing on the theoretically analysis and numerical simulation, the simulation tests in wind tunnel of crescent-shaped iced conductor is stetted up and put into practice, and then the systemic study is carried into execution. The result of research is indicated that there is a better coherence between the numerical simulation and experiment test, and the result of numerical simulation is the beneficial supplement to the experiment test. The result can not only provide the original date for the galloping analysis, but also validate the affectivity of numerical simulation, support the research of mechanism and control of galloping.
Numerical Simulation on the Dynamics for the Ultrasonic Cavitation Bubble in Chitosan Solution
Authors: Huang Yong Chun , Wu Yu , Yang Feng
Published: March 2013

In order to understand the influencing factors and laws on the ultrasonic cavitation dynamics in chitosan solution, numerical simulation of cavitation bubble motion had been performed based on Rayleigh-Plesset equation and the equation was solved by using 4~5 order Runge–Kutta algorithm. By numerical simulation the effects of frequency and intensity of ultrasonic, ambient pressure, initial bubble radius, concentration and temperature of solution, dual-frequency ultrasonic on the motion of cavitation bubble were discussed. The results show that for improving the effect of cavitation in chitosan solution, ultrasonic cavitation should be under the conditions of lower frequency, lower intensity, lower ambient pressure, smaller initial cavitation bubble, moderate temperature of solution and lower concentration. It is also found that the cavitation intensity due to dual-frequency ultrasonic is stronger than that of single-frequency ultrasonic.
Finite Element Analysis of Thermal Residual Stress in Unidirectional Fiber Reinforced Composite
Authors: Luo Zhi , Wang Xiao Long , Jing Hong Jie , Wu Heng An
Published: March 2013

During the cooling process of composites after curing, thermal residual stress will be produced due to mismatch of the coefficients of thermal expansion between matrix and reinforcement phases. Thermal residual stress is one of the most important factors that affect the mechanical properties of composite materials. The effect of fiber volume fraction on the distribution of thermal residual stress in unidirectional fiber reinforced composite has been investigated with finite element analysis. The results show an inhomogeneous distribution of thermal residual stress in different regions of composites. The longitudinal stress on the interface between matrix and fiber is the main factor resulting in debonding failure of composites. This numerical study can be of great significance in designing new composites with high performance.
Stress and Strain Analysis of SRM Based on Monitored Shipboard Service Environment
Authors: Huang Wei Dong , Zhang Li Ping
Published: March 2013

Shipboard service environment of solid rocket motor (SRM) was monitored. Based on the monitored temperature and vibration data, the effects of temperature and low frequency vibration load on the stress and strain of SRM were analyzed by ABAQUS. It was shown by the results that the stress and strain of gain fluctuated near the initial thermal stress and strain with the low frequency vibration load. It was also found that the variations in stress and strain of the bonding interface were larger than that of the slot.
Research on Failure Trend of Lifter on Basis of Static Strength Analysis
Authors: Xia Chang Qing , Sun Ying Shi
Published: March 2013

To ensure the safe use of lifter as process equipment for fabricating and producing railway vehicles, this paper analyzes on the working conditions of lifter 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.
An Examination of Blade Load Calculations Based on Rigid-Flexible Coupling Model
Authors: Wu Jie , Yang Wei Dong , Yu Zhi Hao
Published: March 2013

Based on the finite rotation hypothesis, a rigid-flexible coupling dynamic model is developed. It introduces three rigid degrees of freedom with respect to classical moderate deflection beam theory. With quasi-steady theory and pre-described wake model, aerodynamic forces are tightly coupled with structural motions. Structural forces and moments are computed while equations of motions are solved. Sectional loads by three load caculation methods are examined by the analysis results of BO105 and the flight test data of the SA349/2 helicopter. Force integration method can handle vast ranges of computation cases. The predictions are relatively good except for the numerical integrating errors. Accuracy of reaction force method depends on the accuracy of response solutions and can not predict the loads at points between nodes. For the articulated rotor, force integration method shows better results than curvature method on retreating side.
Empirical Approaches to Calculate External Blast Load on Structures
Authors: Hu Yu Tao , Lu Fang Yun , Jiang Bang Hai , Zhang Duo
Published: March 2013

Modeling structures response to external blast loads is studied in this paper. A new model is developed based on the experimental data in literature UFC (unified facilities criteria) 3-340-2. The new model differs from the model which is available in LS-DYNA as take into account new abacuses for reflecting coefficients, leading to more precise load especially at great incidence.
The Influence of Void Orientation on Stress and Strain Fields for Nickel-Based Single Crystal Superalloys under Creep Loading
Authors: Yu Qing Min , Wang Li Bin
Published: March 2013

Fracture surface of crept nickel-based single crystal superalloy specimen shows that voids play significant role in creep rupture. In this study, the unit cell model containing two voids was established to study the influence of void orientation on the stress and strain distribution for nickel-based single crystal superalloy under creep loading with the creep constitutive relationship based on the crystal slip theory. Three cases were considered with different angle between the line connecting the centers of two voids and loading axis. The distributions of equivalent Mises stress, maximal resolved shear stress and equivalent creep strain have been given for different creep stages. The results show that the void orientation has remarkable influence on the void growth and the stress and strain distribution during creep.
Strength Calculation of Cubic Hinge Sleeve Based on Ansys
Authors: Sun Xuan
Published: March 2013

Actual model of cubic hinge sleeve was established in Ansys. Strength of cubic hinge sleeve was calculated under high pressure load in realistic condition, which is based on practical processing, results of values of von Mises stress were obtained. It provides a theoretical basis for optimization and reliability design of cubic hinge sleeve. Possible factors which causes fracture of cubic hinge sleeve was analyzed preliminary.
Analysis and Circuit Simulation of New Five Terms Chaotic System
Authors: Huang Guo Qing
Published: March 2013

A new chaotic attractor is reported with only five terms in three simple differential equations. The system is not only studied via theory analysis and numerical simulation, such as Lyapunov exponents, power spectrum and poincaré section and bifurcations diagrams, but also implemented via an electronic circuit designed by Multisim software
Coupling Analysis for a Submerged Ring-Stiffened Cylindrical Shell Treated with Active Constrained Layer Damping
Authors: Yuan Li Yun , Lu Jing
Published: March 2013

Based on the previous study, the coupling analysis for a submerged active constrained layer damping (i.e. ACLD) cylindrical shell with ring ribs is developed in this paper. Firstly, the governing equation for this kind of shell is proposed. Then, a multi-virtual-point-sound-source wave function superposition method combing the transfer matrix method is proposed to obtain the acoustic pressure level. Later, numerical results are given to verify the developed method. Finally, the damping effect for the ACLD treatment on the ring-stiffened cylindrical shell is discussed.
Shaft Instabilities in Two-Stage Gear Systems
Authors: Rao Zhe , Zhou Chun Yan
Published: March 2013

The present paper is focused on the torsional instabilities of the intermediate shaft in a two stage gear system. A theoretical model is established taking account in the torsional flexibility of the intermediate shaft and the meshing time-varying stiffness of the gears. Multiple scale method is applied to analysis the instability areas of the gear system for which the generalized modal coordinate is adopted. The result is certificated by numerical integrals of the dynamic equations by Runge-Kutta Method.
Rolling Bearing Fault Diagnosis Using Sample Entropy and 1.5 Dimension Spectrum Based on EMD
Authors: Zhong Xian You , Zhao Chun Hua , Dong Hai Jiang , Liu Xian Ming , Zeng Liang Cai
Published: March 2013

An approach of fault diagnosis of bearing based on empirical mode decomposition (EMD), sample entropy and 1.5 dimension spectrum was presented. Firstly, the original vibration signal was decomposed into a number of intrinsic mode functions (IMFs) using EMD. Second, the sample entropies of IMFs were calculated to select the sensitive IMF. Finally, the IMF containing fault infor- mation was analyzed with 1.5 dimension spectrum, The experimental results show the method can be used to effectively diagnose faults of rolling bearing.
High-Performance Real-Time Bus in Parallel Processing System
Authors: Cheng Xin , Wu Hua Chun
Published: March 2013

Rapid increases in the complexity of algorithms for real-time signal processing applications have made multi-processors parallel processing technology needed. This paper proposes a design of high-performance real-time bus (RTB), based on which distributed shared memory (DSM) mechanism is established to implement data exchange among multiple processors. Adopting DSM mechanism can reduce the software overhead and improve data processing performance significantly. Definition and implementation details of RTB and data transmission model are discussed. Experimental results show the stable data transmission bandwidth is achieved with performance not affected by the increasing number of processors.
Coherent Demodulation of the Mud Pressure DPSK Signal and Analysis of Noise Impact on the Signal Demodulation
Authors: Shen Yue , Zhang Ling Tan , Cui Shi Li , Su Yi Nao , Sheng Li Min , Li Lin
Published: March 2013

Based on the mathematical analysis of band transmission signal coherent detection theory and mud pressure DPSK signal modulation process, by establishing the coherent detection mathematical model of mud pressure DPSK signal, this paper studies the practicability of broadband mud pressure DPSK signal coherent detection. By analyzing the noise impact on input signal parameter of demodulation system, based on probabilistic statistics theory and coherent demodulation mathematical model, the bit error rate and antinoise ability of mud pressure DPSK signal is studied. Theoretical analysis and numerical simulation indicate that, by adding arc cosine and derivation segment to basic demodulation process, the coherent demodulation effect of mud pressure DPSK signal is satisfied, but the demodulation process is more complex than conventional communication system. Theoretical analysis shows that mud pressure DPSK signal has the same theatrical bit error rate as conventional communication binary phase shift keying (2PSK) signal, but due to the difference of signal demodulation means, the reconstruction of rotary valve control pulse will be affected seriously by the derivate of vertical component of the noise within frequency band, causing that the antinoise ability of mud pressure DPSK signal demodulation system is far lower than 2PSK signal system, and numerical calculation shows that the actual bit error rate is far higher than latter; so under the condition of large carrier frequency, to obtain relative small actual bit error rate and relative larger information transmission rate, the mud pressure DPSK signal input signal-to-noise ratio should be raised as far as possible.
Decomposition with LMD of Mechanical Fault Signals Based on LabVIEW
Authors: Ma Zi Qin , Yang Wu , Kang Da Li , Zhang Ren
Published: March 2013

The local mean decomposition is able to diagnosis non-stationary signals in mechanical fault, and it has important theoretical meaning and practical value. This paper first introduces the method of local mean decomposition, and then proposes the improved LMD. The improved LMD uses cubic spline interpolation to get the local mean function and envelope estimation function. What’s more, the simulated signal is analyzed by this algorithm with the LabVIEW virtual instrument development platform. The result shows that the computation efficiency of the improved LMD is obviously higher than that of the original. Finally this paper uses improved LMD analyze the rolling bearing with out-race fault, and the result conforms to the reality.
Research on Key Technology of 2D Barcode in Identity Authentication
Authors: Song Qian , Liu Li
Published: March 2013

Two dimensional barcode has widely applied in identity authentication. In this paper, the image processing methods used in PDF417 barcode recognition were researched, and a quick and effective method to calculate the width of the unit module in PDF417 barcode was proposed. The fast and omni bearing recognition and decoding of the PDF417 barcode was realized.
Design of Air-Lock Valve of the Mesh Roller-Type Unginned Cotton and Film Remnant Separator
Authors: An Hong Lei , Zhang Ruo Yu , Kan Za , Li Xiao Liang , Jiang Ying Lan
Published: March 2013

Air-lock valve is an important part of the mesh roller-type unginned cotton and film remnant separator. To improve the structure of the air-lock valve, the cotton flow condition in the separator was analyzed by using high speed imaging technology firstly. Then friction coefficient between unginned cotton and mesh roller was tested by experiment. Meanwhile, some parameters of the air-lock valve were obtained by analyzing different phenomenons that are blockings in the air-lock valve during running of the separator. Finally, the validation test was done, the results indicate that the improved air-lock valve is more reasonable than before, and the blocking can be avoided successfully.
The Training Method of General Regression Neural Network for GDOP Approximation
Authors: Li Xian , Wu Mei Ping , He Xiao Feng , Zhang Kai Dong
Published: March 2013

Aimed at the problem of real-time and accurate Geometry Dilution of Precision (GDOP) approximation, a new method using general regression neural network (GRNN) was proposed firstly, and the training samples selection and normalization method was studied by using spectrum analysis. The computation results show that the symmetrical constellation needs 24 hours continuous samples while the hybrid one needs 72 hours to train the neural network sufficiently. Finally, the performance analysis shows that this new method has excellent performance on temporal and spatial generalization approximation accuracy, when trained GRNN are used, the GDOP computational error is less than 0.25 within 30 days, and the error is less than 0.3 within 10 degrees latitude/longitude area.
Reversible Authentication Scheme of Images Based on Lifting Wavelet Transform
Authors: Yan Yan , Sun Yuan , Wang Hui Qin , Lin Ying , Chen Hai Yan
Published: March 2013

A new reversible watermarking algorithm for image authentication, which embeds authentication information into the sub-band coefficients after lifting wavelet transform by using the difference expansion method, is proposed in this paper. Block map, after quad-tree decomposition, is used to represent the whole characteristic of image content and embed it into the original image as watermark information. Experiments results show that the proposed scheme can restore the image reversibly and has good ability to detect and locate vicious tamper.
A Time-Varying Generalized Minimum Variance Controller for Servo Application
Authors: Li Zheng
Published: March 2013

A generalized minimum variance controller is developed for linear time-varying systems for servo applications. The plants to be controlled is described using a SISO CARMA model and the control objective is to minimize a generalized minimum variance performance index, where the output tracking error variance is penalized by squared incremental of plant input in order to reduce fluctuation in plant input and attenuate process disturbances.
Research on Adaptive Power Control System of Working Machinery
Authors: Chen Guo Jin , Liu Ting Ting , Ni Jing , Xu Ming , Feng Huo Qing
Published: March 2013

The load changes of working machinery in the running process will certainly result in poor matches in the characteristics of the transmission system. For the issue, this paper studies the adaptive power control model and algorithm. The adaptive power control system is developed using the adaptive power control technology based on the load identification, and is applied in the full AC electric forklift and the CNC band sawing machine. The variable frequency system and intelligent control method based on the integration of the load characteristic recognition and control proposed in this paper, adaptively adjust the parameters of the PID controller according to the load characteristic parameters identified real-timely for the transmission system of the working machinery, so as to achieve the best performance matches, the highest effectiveness and lowest energy consumption of the entire transmission system.
Control Analysis of Point-to-Point Positioning Based on Macro-Micro Stage
Authors: Fang Ji Wen , Long Zhi Li , Zhang Lu Fan , Cai Jian Dong , Nian Long Sheng
Published: March 2013

Macro-micro stage can achieve large travel range and high precision positioning. The macro stage is driven by voice coil motor (VCM). The micro stage is actuated by the piezoelectric (PZT). The positioning theory of macro-micro stage is described. In this paper, the compensating method of point-to-point (PTP) positioning is divided into two types: compensation before steady state (CBS) and compensation after steady state (CAS). The different control strategies are applied to meet CAS and CBS. Because of the structure of macro-micro stage and the saturation of micro stage, switching control plays an important role in realizing high precision PTP motion. When the error of the macro stage is less than the threshold and also the system meets the switching conditions, the compensation signal is sent to the PZT control loop for high resolution compensation. Finally, the numerical simulation results show that the positioning accuracy of dual stage is higher than single macro stage and can reach nanometer scale.
Consensus Problem of Singular Multi-Agent Systems with Continuous-Time and Fixed Topology
Authors: Jiang Tong Qiang , He Jia Wei , Gao Yan Ping
Published: March 2013

The consensus problems of two situations for singular multi-agent systems with fixed topology are discussed: directed graph without spanning tree and the disconnected undirected graph. A sufficient and necessary condition is obtained by applying the stability theory and the system is reachable asymptotically. But for normal systems, this can’t occur in upper two situations. Finally a simulation example is provided to verify the effectiveness of our theoretical result.
The Development of Carpet Sampling Machine
Authors: Chen Yi Hong , Yan Ru Zhong , Dai Hui Liang , Yang Yan Zhu
Published: March 2013

In order to meet the market demand for carpet sampling, designed a NC control system by analyzing the working principle of Axminster loom, the upper computer program could extract, analyze and process the pixel information from image and to communicate with the lower system instantaneity via Ethernet and send the information of the picture to the lower system. The lower system combines with the Servo control and motion control program, making each part of the system move precisely and coordinately. The system can make carpet sample more efficiently with high quality. The result showed that this control system has practical application value.
Design and Implementation of Video Conference System Based on SIP
Authors: Zhang Xiao Jing , Yao Deng Ju , Zhan Xiao Juan , Yue Ya Jie
Published: March 2013

A video conference system based on SIP is introduced in this paper. It elaborates the structure and design of the system's functionality. The meeting control center of core part of this system is introduced in detail, and the specific implementation methods and control flow is mentioned. The system uses a hierarchical design idea. It is an extension of a strong multi-party video conferencing system solution which utilizes more mature network technology and encryption technology to ensure t real-time and safety of the system.
On E-Commerce Development Strategies of Pearl River Delta Region
Authors: Hu Yu Ping , Yin Hua , Wang Zhi Jian
Published: March 2013

The development of e-commerce in the Pearl River Delta Region has benefited from its sound environment. It is one of the important measures to develop e-commerce forward a new industrial road, which can promote IT-based industrialization, change the mode of economic development and improve the quality and efficiency of the national economy. This paper presents the current situation of e-commerce development in the Pearl River Delta region, analyzes its development advantages and tendency, and concludes with some existed problems and the further development countermeasures of the Pearl River Delta Region e-commerce.
Research on Knowledge Base System of Straightness Verification Base on Ontology
Authors: Xu Ben Sheng , Wang Can , Zhong Yan Ru
Published: March 2013

To realize the management and reuse of the knowledge of straightness verification, the ontology theory is applied in the knowledge base system of straightness verification. The system is divided into three layers: domain layer, inference layer and application layer. The ontology of the straightness verification is established for formal description of the conceptions of straightness verification and the relationship among these conceptions. Related axioms, rules of straightness measurement are given out according to related standard documents. Finally, an application platform is provided for the digitized realization of the straightness verification.
Secure Access Scheme Research and Design Based on the Internet of Things
Authors: Liu Wei , Zhong Jing , Lin Jun
Published: March 2013

By analyzing and extending 802.1X protocol, this paper proposes a scheme of secure terminal access on the internet of things. The scheme consists of three components: an authentication client, a switch supported 802.1X protocol and a radius authentication server. This paper proposes the work flow after explaining these components respectively. The test results show that the scheme satisfies the functional requirements of terminal security access on the internet of things.
Smart Water Monitoring and Management System Based on the Architecture of Internet of Things
Authors: Cui Bo , Meng Qing Hong
Published: March 2013

The groundwater is a kind of necessary and precious resources. Because of continually increasing demand of water resources in various industries and position decentralization of water wells, management of water wells become more and more complicated and important. The conception of “Smart Water” is raised according to “Smart Planet” for the first time. The paper put forward a kind of monitoring and management system based on the architecture of internet of things. The system includes sensor layer, transport layer and application layer. The paper put forward the key technologies of sensors, wireless networking, application platform etc. At last the paper introduces some application of the system in monitoring, calculation, controlling and management.
Research on the Integrated Control Teaching System of Building Based on Fieldbus
Authors: Zhou Qiao Yi , Zhang Zhi Liang , Cui Fu Yi
Published: March 2013

This paper introduced an integrated control teaching system of building completely based on the technique of Lon bus. This system has the typed configuration of IBMS system-two classes network and three layers management (control), and overcomes the limitation of island of information and use protocol conversion gateway in building integration system, it’s a kind of building control integration system with truly open and with standard equivalent system network structure. The system has the characteristic of structure completed, technology.
A Trust Model of P2P in Cloud Computing Environment
Authors: Fei Song , Wang Xiao Jing , Cui Zhe
Published: March 2013

Proposed a new trust model based on P2P technology in the cloud computing environment. The model takes into account more than one cloud computing platform, that is, considering the different cloud computing service provider provide the service of a cross-cloud platform. Such cross-platform cloud (Cross Cloud) can be called the composite cloud computing platform or cloud associated cloud computing platform.The nodes in the cloud computing environment are divided into two categories: customers and providers. According to the different roles of these two nodes, we designed a different trust mechanism, to divide the trust domain with independent single cloud, considered node independence and manageability of domain to process trust choice and trust update, and proposed a new kind of cloud computing service - trust recommendation service.
Design and Realization of the Wind and Solar Power Energy Production State Visualization Intelligent Management Platform
Authors: Li Wei , Gu Long Fei , Dai Zhi Gang , Zhou Zhi Rui
Published: March 2013

This paper designed and realized the wind and solar power energy production state visualization intelligent management platform based on the business requirement of new energy power generation enterprise. It constructed a business integration and data integration new energy power generation enterprise information model through the system function design analysis and main technical features analysis. And on the basis of the information model, it realized the wind and solar power energy production state visualization intelligent management platform. The use of this platform improved the enterprise management level, increased production efficiency, guaranteed a safe stable production, and had great significance on the comprehensive benefit improvement of new energy generation enterprise.
Face Recognition System Based on HWME
Authors: Hu Wei Ping , Deng Hui Wen
Published: March 2013

The limitations of current researches on face recognition is analyzed firstly that the researchers failed to find a compromise between recognition rate and speed. Then open complex giant system and the Hall for Workshop of Meta-synthetic Engineering are introduced. After analyzing features of the face recognition, a new research direction is put forward that face recognition can be treated as an open complex giant problem and can be solved through the Hall for Workshop of Meta-synthetic Engineering (HWME) first designed by Qian Xuesen(Hsueshen Tsien). Finally, a framework of face recognition system based on HWME is proposed and four key points of the system are discussed.
Application of Generalized Regression Neural Network to the Agricultural Machinery Demand Forecasting
Authors: Luo Wei , Fu Zhuo
Published: March 2013

Proposed an agricultural machinery demand forecasting model based on the generalized regression neural network. This model is based on GRNN, using the circulation testing algorithm combined with k-fold cross validation for parameters optimization and network training, and achieves satisfying forecasting precision in the case of small samples. By using the data of total power agricultural machinery and relevant factors from the year 1995 to 2010 in Guangxi province, we tested and verified the effectiveness of the model.
Research on Manufacture Enterprises’ Logistics Costing Account and Control Based on ABC
Authors: Liu Sheng Chun , Gong Ben Gang
Published: March 2013

Activity-Based Costing can identify and remove the invalid cost of the logistics process, and the implementation of the entire logistics process optimization, this method has become the enterprise logistics and control of important tool for cost accounting. With the increasingly fierce market competition, competition between enterprises is not only internal competition but also between supply chains competition. This paper analyzes the influence factor in supplier selection and the supplier selection and evaluation index system; use the AHP to evaluate the suppliers.
The Quantitative Evaluation of Grid Planning Based on Optimized Weighting Method
Authors: Wang Zhi Dong , Liu Zi Fa , Li Jin Chao , You Ziang , Li Hui , Cao Zhi Yong
Published: March 2013

It is crucial for the integral future development of the power grid to measure grid planning rationality during the rapid growth period of it. Through the analysis of the evaluation characteristics and influencing factors of China's power grid planning, this paper determined the value orientation of the grid planning assessment and evaluation content based on a quantitative evaluation of the existing power grid planning model, and established comprehensive assessment index system of grid planning covering security, economic, excellence and coordination based on the safe and stable operation of the power grid, and proposed optimize weight assessment methods applicable to the assessment of the overall level of grid planning based on improved particle swarm optimization. Finally this paper provides the rationality and feasibility of the comprehensive evaluation index system and optimized weight assessment method through engineering empirical analysis.
Simulation of the NOX Emissions for a CNG Direct-Injection Engine
Authors: Luo Fu Qiang , Xu Fu Shui , Li Jing Bo , Zou Bo Wen , Kang Qing Ying
Published: March 2013

The distribution of temperature and NOX concentration field under different crank angle of a CNG direct-injection engine converted from a four-valve gasoline vehicle engine are calculated by the computation model of the CNG direct-injection engine work process using CFD software. The results show that the temperature field spreads around the center of the spark plug in initial combustion period. The position of maximum temperature in combustion chamber moves from the spark plug to the wall and temperature tends to uniform distribution as the piston goes down along with the spread of flame front and the completion reaction after the flame. Temperature distribution is vital to the generation of NOX which changes along with high-temperature zone. The change principle of quantity of NOX in the cylinder is that at first, the quantity continues increasing, then declines, and finally remains stable. Besides this, the generation amount of NOX increase along with the speed.
Corrosion Resistance of Ni-ZrO2 Nanocomposite Coating Prepared by Pulse Electrodeposition with Rotating Cathode in an Ultrasonic Field
Authors: Tian Ya Fang , Li Xian Hui , Ao Zheng Hong , Xue Yu Jun
Published: March 2013

The Ni- ZrO2 nanocomposite coatings were prepared by pulse electrodeposition with rotating cathode in an ultrasonic field, and the corrosion resistance of the coatings were studied in 5% H2SO4. The surface morphologies of composite coatings after corrosion were analyzed by scanning electron microscope (SEM). And corrosion rate was tested using an electronic balance. The results shows that, compared with pure Ni coating, pulse current composite coating and pulse current composite coating with ultrasound, the Ni-ZrO2 nanocomposite coating prepared by pulse electrodeposition with rotating cathode in an ultrasonic field has more uniform micro-structure, more compacted grain and lower corrosion rate. Peculiarly, it exhibits excellent corrosion resistance.
Effects of Intensity of Alternating Electromagnetic Field on Microstructure and Property of ZL114A Aluminum Alloy Castings
Authors: Yan Qing Song , Li Yong , Lu Gang , Lu Bai Ping , Xiong Bo Wen , Zhang Shou Yin
Published: March 2013

Through analyzing and testing the microstructure and property of ZL114A aluminum alloy castings under the condition of alternating electromagnetic field, the effects of the intensity of alternating electromagnetic field on the microstructure and property of ZL114A aluminum alloy castings are studied. The results showed the intensity of alternating electromagnetic field had a great influence on the microstructure and property of ZL114A aluminum alloy castings. With the increase of the intensity of alternating electromagnetic field, the grain size of ZL114A aluminum alloy was more and more small, under the 10A current intensity, the grain was the finest. Whereas, with the increase of the intensity of alternating electromagnetic field further, the grain is more and more big. Meanwhile, in a certain rang of current intensity, the mechanical performance of ZL114A aluminum alloy had been improved comprehensively, its tensile intensity was improved 10MPa and the elongation was increased by 30%.
Research on Microstructure and Properties of Cu-Cr-Zr-Zn Alloy
Authors: Yu Rui Ping , Mi Xun Jun , Xie Hao Feng , Li Yan Feng , Yin Xiang Qian , Gao Bao Dong
Published: March 2013

Electrical conductivity and tensile strength of Cu–0.22 wt.%Cr–0.05 wt.% Zr–0.05 wt.% Zn alloy were investigated after cold working and aging treatment. The results show that good combination of the physical and mechanical properties can be obtained after solid solution at 940°C for 1h and aging at 450°C for 2h. Aging precipitation phase was dealt with by transmission electronic microscope (TEM). The fine precipitation of Cr and Cu4Zr is found in copper matrix. The strength and electrical conductivity can reach 463.23MPa and 85.65% IACS, respectively.
Study on Reconstruction of Fractal Rough Surfaces
Authors: Zhang Nan , Wang Li Hua , He Yu Song , Lu Zi
Published: March 2013

The geometric topography of the engineering surfaces play key roles in many issue of engineering and science including the analysis of friction, wear, lubrication, sealing and contact conductivity, especially microcosmic surface contact, thus the characterization of surface is one of the most important topics of tribology. Using the technology of CAD/CAE, a three-dimensional solid model of the fractal surfaces was established and meshed to provide the computer models for microcosmic contact analysis between two rough surfaces in this paper.