bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation into Permeability and Bearing Strength of Plugging Zone Formed by Lost Circulation Materials
Authors: Li Song , Kang Yi Li , You Li Jun , Li Da Qi
Published: July 2012

Mud loss while drilling fractured formations is a major problem for drilling operating. It is a key to successful temporary sealing technology that lost circulation materials (LCM) can quickly form the plugging zone in the fractures. The permeability of plugged zone influences its bearing strength, as drilling fluid can penetrate and break it, causing it destabilizing and then failure of lost circulation controlling. With the soap film flowmeter, designing different LCM under variable confining pressures, considering the matching relationship of grain diameters and fracture width is (0.5～1):1, analyzing the permeability of plugging zones with different materials. The results indicated that permeability of plugging zone with peanut grains is lower than that of calcium carbonate, but its bearing strength is not as good as that of calcium carbonate, while using merely single LCM. Comparing other materials, the ideal plugging zone is formed with the mixture of peanut grains and calcium carbonate, which has the lowest permeability as well as the bearing strength. The mixture of matching calcium carbonate and smaller peanut grains, comparing to the width of fracture could stands 5 MPa of pressure difference at normal temperature, and 3.9 MPa at 80°C temperature in laboratory. To some extent, it can meet the needs of temporary sealing technology and successfully deal with lost circulation, which demands plugged tightly and bilateral pressurization.
Study of Magnetic Performance of Co2Z Hexaferrite Doped with Nd3+
Authors: Yu Li Hua , Yao Jing , Feng Ze Kun , Huang Ai Ping
Published: July 2012

Co2Z type planar hexaferrite doping of Nd3+ 2CoO·3BaO ·xNd2O3·(10.8-x) Fe2O3 is made with common production process of cermet. The paper studies the influence of Nd2O3 doping quantity on microstructure and magnetic performance of Co2Z type planar hexaferrite. The result indicates that Nd3+ doped Co2Z type ferrite still keeps structure of Z type planar hexagonal, when the doping quantity x=0.050, the magnetic performance in ultrahigh frequency will get improved, the initial permeability can grow to 13, and the cut-off frequency will also relatively reduce to the lowest value 2.131GHz.
Cloud Manufacturing-Based Enterprise Platform Architecture and Implementation
Authors: Zhang Feng , Xue Hui Feng
Published: July 2012

To improve the level of enterprise manufacturing information integration, analyzed integrated logical structure of the cloud, and integration challenges facing, Presents a enterprise integration platform based on cloud computing, and add SOA service break in the cloud integration architecture, as a way to establish the Cloud Integration Architecture. The integrated platform encapsulates the complexity of SOA technical details to make SOA-based application system construction, operation and maintenance easier, efficient. Finally, analysis how to use cloud integration to build enterprise systems integration architecture by an example.
A Low Cost Compact Control System for the HIPPO ROV
Authors: Wang Biao , Wu Chao , Ge Tong
Published: July 2012

This paper presents a low cost compact solution for a Remotely Operated Vehicle (ROV) control system. Both hardware architecture and software architecture are discussed. STM32F-1 series MCUs are used for sensor data acquisition [1], output calculation and actuator control. For software, a real-time OS uC/OS-II is embedded in the MCU [2]. The whole control system has been implemented on an observation ROV HIPPO. The result of tank test shows this kind of control system has good performance on maneuverability, stability, reliability and control accuracy. Furthermore, HIPPO has successfully served as a third-party vision provider in the lake trail of another ROV.
A Novel Approach of Thrust Ripple Minimization by Combinational Iron-Cored Primary in Permanent Magnet Linear Synchronous Motor
Authors: Xi Neng , Yang Jia Jun , Liu Wen Wei , Shen Jing Fang , Cheng Yuan Xiong
Published: July 2012

The paper presents a technique of combinational iron-cored primary for thrust ripple-free permanent magnet linear synchronous motor (PMLSM). Due to multiple end sides of primary iron-cores constructed, the low order harmonics of thrust ripple could be directly eliminated. At the same time, each phase of armature windings forms a circulating sequence at side edge, which enables the parameters of the armature windings to be symmetric and constant. Therefore, electromagnetic ripple caused by side effect will be directly removed. The theoretical analysis conducted reveals the basic characteristics of the proposed approach. Numeric simulation of the finite-element method and harmonic analysis verify the correctness of theoretic analysis and direct effects of the approach on eliminating thrust ripple.
An Improved Method for Mobile Robot Localization Based on Passive RFID System
Authors: Yang Qing , Wang Hong Yi , Li Jian Cheng , Shen Rong Jun
Published: July 2012

RFID technology has been widely used in mobile robot positioning system for its unique advantages. RFID tags store their unique positions which are placed on the ceiling or the floor. The mobile robot carries a RFID reader which reads the RFID tags to position itself. In this paper, a new method for mobile robot localization is proposed, and the equations to calculate the position of the mobile robot are given. Finally, the experiment results show that compared to conventional positioning method, the proposed method can effectively improve the positioning accuracy of the mobile robot.
Design and Analysis of a Robot-Assisted Manipulator in Retinal Vascular Bypass Surgery
Authors: Huang Long , Zhang Lei Yu , Yang Yang , Shen Li Jun , Chen Yi Qi
Published: July 2012

Retinal vascular bypass surgery (RVBS) is a kind of complicated operation, with high precision and dexterous manipulation limited to small workspace. It is necessary to design a robot-assisted manipulator for performing such a task. The process of RVBS is described according to clinic operation at first. The motion of surgeon and workspace of surgical instruments are analyzed; correspondingly, motions of robot-assisted manipulator are obtained. Then, mechanism of manipulator including remote center of motion (RCM) is proposed through considering constraints induced by pierce points of sclera. Finally, inverse kinematics of the proposed robot-assisted manipulator is done to realize retinal surface motion. The analysis results show the end-effectors of robot-assisted manipulator can reach arbitrary position on the retinal surface.
Design and Experiment of Shock Absorber Electro-Hydraulic Servo-Testing System
Authors: Liu Xue Jun , Liu Cun Xiang , Zhang Er Li
Published: July 2012

Error compensating PID regulation algorithm was applied to design the shock absorber electro-hydraulic servo-testing system, which conforms to national standard QC/T 545-1999,. According to adopt the MTS407 controller, implement indicator diagram testing, speed diagram testing, friction diagram testing, temperature wearing diagram testing, wearing life testing, single and double actuator testing and whole frequency testing are implemented. After the experiment conducted by using shock absorber CA1049, the result shows that the testing system can collect mass data, and is high precision.
Evaluation and Analysis of Temperature Uniformity for Planar Automotive Waste Heat Thermoelectric Generator
Authors: Yuan Xiao Hong , Sun Qiang , Hou Xian Jun , Chen Shu , Liu Zhi En , Deng Ya Dong
Published: July 2012

The present paper discusses temperature distribution of Thermoelectric Generator (TEG) using automotive waste heat , an index to evaluate the temperature uniformity of hot end box surface of TEG is proposed. Three-dimensional heat transfer model is established to simulate the temperature distribution on hot end box surface of TEG with computational fluid dynamic program FLUENT. The simulation result indicates that under the same topology of thermoelectric modules , the internal structure inside the hot end box could effectively improve the heat transfer between waste gas and hot end box, raising the hot end box surface average temperature by 7.2 percent from 534.2K of to 572.6K ; raising the temperature uniformity coefficient by 4.8 percent from 0.83 to 0.87, the result shows that the waste gas could be utilized more efficiently and generate more output.
Linear Octree Represented Tool Swept Volume Modeling on Complex Surface Machining
Authors: Chen Xu Bing , Shan Chen Yu , Xiong You Lun
Published: July 2012

In this paper, a novel approach of linear octree is employed to represent discrete tools and build their swept volumes along machining trajectories. Firstly, a data structure of linear octree is defined as the base of geometrical transformations. The linear octree can be extended into leaf nodes in the deepest level for simplifying homogeneous transformations, and all leaf nodes in the deepest level can also be concentrated into a linear octree for saving storage capacity inversely. Secondly, tool trajectories are interpolated as short lines, and swept volumes between neighbor interpolation points are defined as the Minkowski sum of their cell sets at both locations. Thirdly, equations of the rotation matrix for local coordinate system, roll, pitch and yaw angles of tool orientations are established to define the global rotation motions. Finally, a case of discrete sphere tool and its swept volume modeling are studied to validate the proposed approach.
Design Knowledge Reuse Strategies for Complex Equipment Design
Authors: Zhang Dong Min , Wu Yan Yun , Huang Ye
Published: July 2012

Series products and variant products are the basic strategy for enterprise product development. Product designers reuse the knowledge, experience in the various stages of product development. The design reuse strategies for mechanical products are studied. The concepts of product design reuse level and product design reuse dimensions are presented. The enabling techniques for design reuse are concluded, including CBR, KM/KBE, design reuse modeling. A case-based design tool and a design knowledge management tool are developed based on studying product design reuse strategies.
The Design of Automatic Solar Tracker
Authors: Yu He Jun , Wang You Li , Li Jian Ying , He Xiao Lei
Published: July 2012

The thesis describes the feature and system principle of a new type automatic solar tracker in the Solar Radiation Observing System. The new type automatic solar tracker is absolutely automatic、all-weather and with high precision. The system plans two control modes: orbit tracking mode and sensor tracking mode. In the paper the rationale and the project of the two control modes in the system is elaborated and the smooth switch between the two control modes is discussed.
Design Teaching Machine Tool of Open CNC System on PC
Authors: Lü Yong , Liu Yun Qiang
Published: July 2012

In this paper, we design the open numerical control system of PC based on embedded motion control card. This open NC teaching machine tool is not only for the removal to meet the teaching requirements of the mechanical design, but also allows users to define instructions, to convert CNC instructions to the control card built-in function on the PC; to export the control information to control machine tool axis movement. This greatly enhances the students’ interest, and helps them to faster formation of the core competencies of the CNC technology.
Research on Distributed Remote Monitoring System for NC Machine Tools
Authors: Han Xing Guo , Wang Bin Wu
Published: July 2012

A whole design scheme of distributed remote monitoring system of NC machine tools is put forward and the middleware technology of combination of CORBA and web service is importantly discussed in this paper.This system is divided into three layers—field layer,middle layer and user layer. Finally, in this system platform, the errors of circular interpolation and linear interpolation are measured.
Stiction of Flexural MEMS Structures
Authors: Liu Yun , Zhang Yin
Published: July 2012

A variational method using the principle of virtual work (PVW) is presented to formulate the problem of the microcantilever stiction. Compared with the Rayleigh–Ritz method using the arc-shaped or S-shaped deflection, which prescribes the boundary conditions and thus the deflection shape of a stuck cantilever beam, the new method uses the matching conditions and constraint condition derived from PVW and minimization of the system free energy to describe the boundary conditions at the contact separation point. The transition of the beam deflection from an arc-shape-like one to an S-shape-like one with the increase of the beam length is shown by the new model. The (real) beam deflection given by this new model deviates more or less from either an arc-shape or an S-shape, which has significant impact on the interpretation of experimental data. The arc-shaped or S-shaped deflection assumption ignores the beam bending energy inside the contact area and the elastic energy due to the beam/substrate contact, which is inappropriate as shown by this study. Furthermore, the arc-shaped or S-shaped deflection only approximately describes the deflection shape of a stuck beam with zero external load and obviously, the external load changes the beam deflection. The Rayleigh–Ritz method using the arc-shaped or S-shaped deflection assumption in essence can only be used to tell approximately whether stiction occurs or not. Rather than assuming a certain deflection shape and by incorporating the external load, the new method offers a more general and accurate study not only on the microcantilever beam stiction but also on its de-adherence.
Implementation of Precision Force Control for an Electro-Hydraulic Servo Press System
Authors: Chen Hong Ming , Shen Chun Sheng , Lee Ting En
Published: July 2012

Based on the fuzzy method, a PC-based precision force control scheme is proposed for the electro-hydraulic servo press system. The main feature of proposed scheme is to develop a composite control of relief valve and flow servo valve. With the feedback of force sensor, the fuzzy-based control system is realized by LabVIEW for achieving the precision force control of hydraulic cylinder. In the experiments, a practical platform of hydraulic servo press system is used to demonstrate the effectiveness of proposed scheme. The testing results indicate the accurate output responses.
Research of H∞ Robust Control for the Giant Die Forging Hydraulic Press’s Synchronous Control System under the Uncertainty Coefficient
Authors: Deng Ying Jian , Liu Zhong Wei
Published: July 2012

The giant hydraulic die press is our country national defense and the infrastructure essential equipment, the synchronous control system is the essential device to the giant forging hydraulic press, its synchronization control performance quality is good or bad will directly determine the quality of the product. This article through the proof of the theorem, gives the specific steps to achieve H∞ robust control algorithm. The simulation results show that: this control strategy has good inhibition to the change of system parameters, robustness is very strong, can well eliminate the system synchronization error.
Endogenous Growth Model for China's Green IT Based on Green Technology and Green Society
Authors: Liu Feng Tao
Published: July 2012

China's green IT development is faced with the unique “IT social risk”. Therefore, the endogenesis of China's green IT development has been challenged. Using the concept of “society greening”, we divide a green IT system into a technology greening sub-system and a society greening sub-system, based on which an endogenous growth model was built. Using an optimal control method to solve the model, we find the long-term equilibrium rate of economic growth, transversality conditions, the relationship between the output flexibilities of the input factors in the two sub-systems, the relationship among the elasticity coefficients of intertemporal substitution in consumption, as well as the optimal conditions for the whole system. The results show that to allow China's green IT to develop, the output elasticity of the society greening sub-system knowledge must be higher than that of the technology greening sub-system. This urgently requires government incentives and other public products to balance the investment efficiency in the two sub-systems.
Structural Finite Element Analysis and Optimization of Underwater High Pressure Valve
Authors: Yi Xian Zhong , Jiang Sheng Zong , Zhang Jun Feng , Feng Ding , Gao De Li
Published: July 2012

Abstract. The ship side flap valve underwater works with high pressure. In this paper, the valve body is analyzed using seamless connection between the finite element analysis software and Pro/E software. In the analysis, multiple load cases applied to the valve body are as follows: open condition, closed condition and seal test. The analysis result shows the maximum stress value occurs when the flap valve is open. Moreover, stress value is approximately 65 percent the range of the minimum yield strength, but the strength requirement of the valve body is satisfied. Finally, this paper presents a method for weakening the stress concentration effect by increasing the internal transitional fillet radius between the two hollow and intersectant cylinders of the valve body.
Constant Power Speed-Adjusting of Shearer Cutting Motor by Single Neuron Self-Adaptive PID Controlling
Authors: Li Xiao Huo , Hu Yan Tao , Chi Qing Di , Bai Shuai Wei
Published: July 2012

In order to suit better for variations of coal and rock with different properties, solve the problem of big fluctuation of a cutting motor power, and ensure the durable high-efficient, high-energetic working of a shearer, a constant power speed-adjusting system of shearer cutting motor is designed based on the theory and the method of single neuron self-adaptive PID controlling, the system effects constant power function of shearer cutting motor by adjusting continually the shearer’s haulage speed. A systematic simulation model is build by using the Matlab/Simulink, and the experiment shows: the speed-adjusting system of single neuron self-adaptive PID controlling has following advantages by comparing it with a traditional controlling method: adjustment time of haulage speed decreases by 0.6s, overshoot and adjustment time of the cutting motor power lower by 2.4% and 0.27s respectively, which improves the working efficiency of the shearer by a rapid reaction speed and a good controlling property.
Modeling and Simulation of Emulsion Pump Station Pressure Control System Based on Electro-Hydraulic Proportional Relief Valve
Authors: Zhang Chuan , Zhao Si Hai , Guo Ge , Dong Wei Kang
Published: July 2012

The emulsion pump station is the power source of the hydraulic support and the hydraulic props of fully-mechanized mining face. Providing work medium such as high pressure and big flow for the system used liquid such as hydraulic support are its responsibility. This paper put forward a system can control the pressure of the emulsion pump station based on electro-hydraulic proportional relief valve. After applying the electro-hydraulic proportional relief valve technique, this system reconstructed the pipeline of pump station. In order to realize the control of pressure, this system used the PID controller in PLC technique to perform logical operations and finally controlled the unload action of overflow valve. This paper give a detailed design of the system, and then build a mathematical model based on the electro-hydraulic proportional pressure control system hardware and analysis the results of control using simulation software.
Fault Diagnosis to Mid-Size Excavator Bucket Hydraulic System Based on Fault Tree Analysis
Authors: Sun Jiang Hong , Ma Chi , Yi Yuan Lin
Published: July 2012

Analyzes bucket hydraulic system of hydraulic excavator by fault tree analysis. According to logical relationship of hydraulic system structure, draws fault tree, finishes qualitative and quantitative analysis .Divides the minimum cut sets. Calculates the reliability of whole system to find the weakest components. Puts forward ways to increase the reliability on basis of oil pipe.
A Global Fast Integral Operator Terminal Adaptive Sliding-Mode Controller
Authors: Cao Lu , Chen Xiao Qian , Zhao Yong
Published: July 2012

Attitude Control System(ACS); Terminal; Adaptive; Integral operator Abstract: Attitude Control System (ACS) with high performance, high precision, and high reliability is the kernel technology of the research of spacecraft, which directly affects the whole performance of spacecraft. Hence, a global fast integral operator Terminal adaptive sliding-mode controller is proposed to come true the high performance control. The theory of this controller is to introduce the limited time mechanics—Terminal mode to the sliding-mode control and introduce the integral operator to the sliding-mode plane, which can realize the convergence of spacecraft attitude in “limited time” in the condition of serious disturbance , in order to enhance the performance of fast response. At last, the simulation results demonstrate the high reliability and advantages of the control approach.
Accurate Measurement of Photoelasticity Based on Digital Camera
Authors: Wu Hsien Huang P. , Chang Shih Hsin
Published: July 2012

Photoelastic analyses have been successfully conducted by several researchers and many equations based on digital images were presented. Although these equations were all derived using the light intensity emitted from the analyzer, pixel values of the digital image were actually used in the real calculations. In this paper, we proposed that relative light intensity should be used instead for more accurate photoelastic analysis. Real isochromatic images were generated based on relative light intensity as well as pixel value. The analysis showed that the proposed approach can obtain better result than that of the previous method.
Adaptive Interacting Multiple Model Unscented Particle Filter Tracking Algorithm
Authors: Liu Hong Jiang
Published: July 2012

In order to study the tracking problem of maneuvering image sequence target in complex environment with multi-sensor array, the adaptive interacting multiple model unscented particle filter algorithm based on measured residual is proposed. The motion array tracking system dynamic model is established, and initialized probability density function also is defined based on unscented transformation, after that, the measured covariance and state covariance are online adjusted by measured residual and adaptive factor, then the self-adapting capability of filter gain and the real-time capability of posterior probability density function are improved. Finally, the simulation results between different algorithms show the validity and superiority of the presented algorithm in tracking accuracy, stability and real-time capability.
An Amended Harmony Search Algorithm for Unconstrained Optimization Problems
Authors: Li Ruo Ping , Ouyang Hai Bin , Gao Li Qun
Published: July 2012

Harmony search (HS) algorithm is a new mate heuristic algorithm, which is conceptualized using the musical improvisation process of searching for a perfect state of harmony. Its own potential and shortage, one of its main disadvantages is that it easily trapped into local optima and converges very slowly. Based on the conception of swarm intelligence, this paper presents an amended harmony search (AHS) algorithm. AHS introduces a novel position updating strategy for generating new solution vectors, which enhances solution accuracy and convergence rate of algorithm. Several standard benchmark optimization functions are to be test and compare the performance of the AHS. The results revealed the superiority of the proposed method to the HS and its three improved algorithms (IHS, GHS and NGHS).
Application of a New Soft Measurement in Xylitol Fermentation Process
Authors: Lin Yuan Yan , Xu Cheng Fu , Wang Bin Wu
Published: July 2012

Owing to Key parameter in Xylitol fermentation process cannot be measured on line, the soft measurement technology is used to estimate the xylitol and the xylosc concentration in this work. The RBF neutral network which is optimized by uniform design method is taken as a new soft measurement model. The genetic simulated annealing algorithm(GASA) is used to optimize the initial parameters of RBF network which is applied to xylitol fermentation process. So the xylitol and xylosc concentration can be measured in real time.
High Speed Dry Cutting Technology Applications in Production
Authors: Li Yun Chao , Zhang Yu Hua , Sun Bo
Published: July 2012

Green cutting processing technology is a kind of full consideration of the environmental and resource issues processing techniques, It requires throughout the process do to the environment pollution to the minimum and the utilization rate of the highest. In the machining process without any cutting fluid of dry cutting is control environmental pollution source of a green manufacturing process, it can have clean scraps, no pollution, save the cutting fluid and the processing of costs, can further reduce the production cost. Therefore, the future direction of the cutting process is not or with as little as you cutting fluids, and energetically develop on the ecological environment and human health negative effects of small, processing the superior performance of cutting fluids, and environmental work to completely harmless green cutting fluid development direction.
Application Research on Haigh Diagram in the Wind Turbine Fatigue Analysis
Authors: Zhao Ping , Yan Hong Wen
Published: July 2012

The influence of mean stress on fatigue has to be considered by means of Haigh diagram, the actual stress range is modified to damage-equivalent range. There are three main methods for creating Haigh diagram, such as experiment and empirical relationships and six points, which has the different application field. The creating and application of Haigh diagram in GL certification for wind turbines is studied, and the solving method for the mean stress sensitivity is given.
Research of Data Processing Methods for Metal Cutting Finite Element Analysis Results
Authors: Cong Ming , Song Jian
Published: July 2012

In this paper, the turning process of 45# steel was simulated and analyzed based on the metal cutting finite element analysis software DEFORM-3D. The analysis result of cutting force was gained. However, due to some reasons of the software itself, there is noise data in analysis results. Thus, it’s needed to filter the data to extract useful information. The selected short-duration and steady-state cutting force data was processed with the use of six-sigma rule through mathematical statistics analysis. As a result, some bad data were rejected. Noise data was filtered out via wavelet analysis and the processed function curve of cutting force that changes with time during the whole cutting course was gained.
Virtual and Optimized Design of Mechanical Arm of Forestry Felling & Cultivation Machine
Authors: Wei Zhan Guo , Deng Min Ya , Liu Jin Hao
Published: July 2012

Forestry Felling &Cultivation Machine is a multi-functional, highly automatic and greatly efficient wood-cutting facility, whose unique advantage can be shown in the field of wood-cutting in the mountainous region. Mechanical arm is a prominent component of Forestry Felling &Cultivation Machine so that its design will have a direct impact on the function and the efficiency of Forestry Felling &Cultivation Machine. The paper aims at realization of hypothesized design of Forestry Felling &Cultivation Machine under the control of computer platform through hypothesized design of computer and simulation technology. Besides, it focuses on the structural analysis of mechanical arms through finite element theory and software of finite element analysis. What’s more, optimized design of structure will be reached according to the result of analysis so that the reliability of the structure can be proved and both development cycle of product and its research and development expense will be reduced.
Analysis of New Type Repulsion Mechanism Performance
Authors: Xu Yong Sheng , Kong Li
Published: July 2012

Using circuit method to analysis equations of circuit and motion of coil-coil Mechanism, numerical simulations were also made. Simple method of experimental verification was proposed. The numerical results show influence of circuit parameter and benefits of multiple series gaps.
Dynamics Analysis of Model 150 Diesel Engine Piston
Authors: Zhai Jian Long , Su Tie Xiong
Published: July 2012

Diesel engine piston has complex force condition and adverse working environment, and its motion state has a significant influence on noise, vibration and power of diesel engine, thermal deformation of the piston and liner, deformation on preload condition should be considered in the dynamics analysis. Dynamics analysis of piston based on the theory of secondary motion has been done in this paper, structure has been evaluated, and it provides reference to the piston further optimization.
Study on Sensor-Based Comprehensive Detector of Conveyor Belt Bearing Surface Tearing
Authors: Xue Yong Jie
Published: July 2012

In this paper, the conveyor belt tearing statistics of Qingdao Port Coal and Mineral Terminal Co. Ltd in 10 years is analyzed to seek two characteristics of conveyor belt after tearing, and also a method of using capacitive approach switch and inductive proximity switch to detect the tearing is proposed.
Large-Diameter Line Pipe Expanding Process
Authors: He Ai Xia , Li Rong Chang
Published: July 2012

Mechanical expanding process for large diameter line pipe, a detailed analysis of factors affecting the quality of the final products of the mechanical expansion and proposed optimization using orthogonal array optimization method, as an indicator of dimensional accuracy and shape accuracy of the products, combination of a variety of specifications of mechanical expanding products, the main process parameters to be optimized. Analysis and discussion of results, revealing the degree of influence of various factors on the quality of the final product, and gives the optimum combination of the results. Experiments show that the combination of optimized process parameters, and more help to improve the accuracy of the size and shape of products.
Numerical Simulation of Flow Field within Mutational Section Pipe
Authors: Zhang Jian Hua , Hu Kun , Xu Yi Fan
Published: July 2012

The section mutation of a pipe affects the interior flow field seriously. Numerical simulation of the two-dimensional steady gas flow field of two types of section mutation pipe was processed. By comparing it with equivalent section pipe’s interior flow field, the effects of section mutation of pipe on pressure distributing and velocity distributing were analyzed. The results are commendably consistent with the theories of one-dimensional adiabatic frictional pipe flow. Ensuring the section of the compressed gas pipe to be coherent and using the bell and spigot joint if necessary are presented.
Hydraulic Sytem for Wave Compensation of Deep-Water Exploration Ship
Authors: Chen Zhi Xin , Liu Shuai
Published: July 2012

In order to reduce the influence of the bench extraction equipment from the working deep-water exploration ship when it has swing or heave movement by wind and waves, according to the work condition and the structural parameters of 3000m deep-water exploration ship, Pump-controlled type and valve-controlled type hydraulic transmission system for waves compensation of deep-water exploration ship bench extraction equipment was researched through analysing and calculating. Wire rope which drags the bench is maintained appropriate tensioning status using this wave compensation system, when bench downs to the bottom of the sea. This system can bind and release wire rope to compensate for heave motion automatically, in order to keep the stability and security of the deep-water exploration ship before bench loading the bottom. Dynamic performance of wave compensation system is improved through controlling supplementation pressure and the accumulator parameters precisely.
Vibration Analysis of Coupled Faults Diagnosis in a Rotor System Using Wavelet De-Noising and KPCA Data Fusion
Authors: Zhu Xiu Mei
Published: July 2012

In a rotor system, simultaneous existence of coupled faults, i.e. a crack couples with a misalignment, is very common. However, the single fault diagnosis has been investigated extensively in previous work while the issue of coupled faults diagnosis (i.e. considering two or more than two faults at a time) has been addressed insufficiently. In order to detect the existence of coupled faults and to prevent a fatigue crack in the rotor shaft, a new method is proposed to analyze the vibration signals using the Wavelet de-nosing and kernel principal component analysis (KPCA) in this work. The Wavelet was firstly used to de-noise the original vibration signals, and then the KPCA was adopted to extract useful fault features for the coupled faults detection. A case study on the coupled fault diagnosis of the rotor system has been implemented. The diagnosis results demonstrate that the proposed method is feasible for the coupled fault diagnosis of rotor systems. The fault detection rate is 91.0%.
Research on Synthesis of Benzoic Acids Intermediates
Authors: Zhang Shu Xin
Published: July 2012

This article briefly describes the development of dye intermediates in China and the research and development situation on synthetic 2 - amino-5 - nitrobenzoic acids. It also tries two more new routes to practice synthesis of them, for which it focuses on speculation of the reaction mechanism of the former route and on research of process conditions of the latter, getting the optimal conditions of the synthetic 5 - nitro-isatin. 2 - Amino - 5 - nitro benzoic acid is a versatile organic intermediate, which is seldom reported both home and abroad, but research on its synthesis method and process conditions are significant to the development of China's fine intermediates industry.
Study on the Properties of MWNTs/Polyethylene Nanocomposites by In Situ Polymerization
Authors: Li Shi Yun , Hu De Sheng
Published: July 2012

Multi–walled carbon nanotubes (MWNTs)/polyethylene (PE) nanocomposites were prepared via in situ polymerization with MWNTs supported Cp2ZrCl2 catalyst. XPS and FESEM results imply that Cp2ZrCl2 catalyst has been immobilized in the surface of the MWNTs supports by a MAO bridge. The efficient dispersion of MWNTs in PE matrix and the strong compressive forces associated with PE on the MWNTs were demonstrated by TEM, FESEM and Raman spectra. With introducing 0.2 wt.-% MWNTs, both the tensile strength and elongation of MWNTs/PE nanocomposite increased by factors of 1.6 (from 29 MPa to 45 MPa) and 1.5 (from 909% to 1360%) comparing with the pure PE, respectively. Morphology observation of fractured surface, in accordance with the Raman results, revealed that the PE firmly adheres to the nanotubes, which is responsible for the significant improvement of the mechanical properties of nanocomposites. Thermal stabilities of the nanocomposites were significantly improved. In addition, the MWNTs/PE nanocomposites show very high UV shielding properties, which could increase photooxidative stability of the PE.
Optimization of the Engine Hood to Reduce the Head Injury during the Vehicle-Human Collision
Authors: Wang Yu Xin , Wang Qing Chun , Fu Jian Rong , Qiao Hong Hai
Published: July 2012

Effect of hard point of the engine hood on the head injury during the vehicle-human collision was studied to improve the design of engine hood. Firstly, the current common model of the engine hood was established with three-dimensional finite element modeling software, and 20 areas were divided, also a standard head finite element model was imported, secondly, each area of the engine hood was clashed by the standard head model, then the impact on the head injure was analyzed and the hard point of the hood area was achieved, thirdly, the optimization of the inside and outside panel materials and the plate structure were carried out to reduce the head damage. The simulation results show that the engine hood after optimization gave less damage to the head, which means the research carried out here is of a good reference to the engine hood optimization design for human protection
Research on YH30 Hydraulic Press Parts’s Model Expression Based on XML
Authors: Wang Qiu Hong , Zhang Tao , Dong Yu De
Published: July 2012

This article is in view of the model data storage the problems in the process of interaction, through the XML data intermediate storage method, of the hydraulic press for each model will be stored in the characteristic dimensions in the XML document, according to the predetermined XML Schema (XML Schema Definition, XSD), more articulate products of various kinds of CAD model design information. In this way the data exchange, this model of data kept the way to avoid inconsistencies, transfer of data volume is small, and not in the different between platform to transmit documents appear data loss, data distortion phenomenon, for the follow-up of CAE/CAM analysis with good books.
Design and Study on Analog Modulation Signal Source Based on AT89C51 Microcontroller
Authors: Zhang Wei Ping
Published: July 2012

At present, the analog signal source in a traditional sense is far away from being sufficient to meet the needs of the modern development. Besides, the emergence of the direct digital synthesis (DDS) technology brings about a new vitality to the electronics technology of the modern times. However, because of the characteristics of the digitization, the direct digital synthesis still has the problems (the limited the output frequency range and the large spurious output). For this reason, it is particularly important to solve these problems currently. In this paper, the author carries out an analysis on the circuit characteristics of the DDS system and the analog modulation signal source system, studies their performances and characteristics, and also makes a design on both software and hardware that are based on the analog circuit and AT89C51 microcontroller system. This system is mainly composed of the microcontroller control module, the frequency synthesis module and the multiplier module. The DDS frequency synthesizer can work stably and is easy to realize. Also, the high resolution of its output frequency can meet the requirements of people in the modern times.
Research on Stochastic Modeling of MEMS Gyroscope
Authors: Ren Ya Fei , Bai Xu Can , Ge Yun Wang
Published: July 2012

The majority of MEMS based gyroscopes currently under development operates in a vibratory mode and measures the angular rate instead of the absolute angle. The paper aims to establish the system dynamics models of the typical MEMS Gyro: Vibration Micro-gyroscope and analyzes the dynamic features. With different precision MEMS Gyros as the example, the detailed Times-series analysis are made of AR (6) and ARMA (2, 1) models, the impact of considering the estimation effective and the precision improved
Experiment on Water Hammer Protection Performances of the Shuttle Check Valve in Multi-Pump Parallel Connection System
Authors: Meng Hai Bo , Liu Yong , Li Yong
Published: July 2012

A suddenly pump stop in multi-pump parallel connection system could induce water hammer which may cause serious accidents. To prevent water hammer harm, comparing experiments was carried out to study the water hammer phenomenon in the lift closing check-valve adopted system and the shuttle check valve adopted system. The result indicates that, the shuttle check valve greatly cuts the peak-value produced by stop-pump water hammer impulsion, and reduces the probability of bringing a devastating water hammer accident.
Research on the 802.1x Authentication Mechanism and Existing Defects
Authors: Wang Xin Gong
Published: July 2012

The IEEE 802.1x protocol inherits the advantage of IEEE802.1x LAN and provides a measure to authenticate and authorize the user(or device) which has connected to the local area network.But there are some defects in existing authentication mode based on 802.1x,to control the illegal users.We analysis the working mechanism of 802.1x and the principle of illegal users to access the network.Then the improved method based on monitoring the online users is proposed.It added a detecting module to the authentication server and make use of the interaction between Radius server and client to ensure the accuracy of the list of online users.It can effectively separate unauthorized users from network and protect tht authentication security of the campus network.
Research on Quality Management of Manufacturing Equipment Welding Technology
Authors: Li Dian Can
Published: July 2012

To improve the quality management and the quality level of products is an important issue related to enterprise survival and development. Through the establishment of the welding quality management system, quality control in welding processes and quality improvement research, this paper analyzes quality control of the welding technology, and illustrates how the enterprise develop quality system to deeper levels after passing the certification of quality management. That means, maintaining and continuously improving the effectiveness of the quality management system is the focus of quality management work after the certification.
The Application of Adaptive Kalman Filter Technology in Aspheric Surface Machining and Detection
Authors: Zhang Xue Chen , Cao Guo Hua , Nie Feng Ming
Published: July 2012

The grinding machining parameters of large-caliber aspherics ultra-precision grinding processing depend on the analysis of online profile accuracy detection data .and the detection data has the second order of non-stationary characteristic . The research of second order of non-stationary data processing technique and isolate and reduce the random error of online detection data is key technology of ensure the precision of aspheric surface grinding accuracy . This paper proposed a parallel recursive identification of improved adaptive kalman filtering method , the simulation analysis and φ500mm aspheric surface element grinding experiment proved this method can real-time process second order of non-stationary data of online detection data , isolate and reduce the random error , make a best estimate of time-varying signal, provide correction parameter of grinding process , processed aspherical face proflie accuracy≤4μm.
Can Law of Conservation of Energy Be Broken?
Authors: Chen Dong Hui
Published: July 2012

The law of conservation of energy is an empirical law of physics. It states that the total amount of energy in an isolated system remains constant over time. And it is impossible to break. However, three of evidence presented in this paper cannot be explained by the Law of conservation of energy. Why is the magnetic potential energy gone when the magnet is antimatter annihilated? Why can the steady direct current (DC) be produced when coils are cutting magnetic lines without any obstruction? Why can’t the induced current hinder the change of temperature and magnetic flux? All of these just suggest that the total amount of energy in an isolated system is not conserved over time—the law of conservation of energy can be broken.
Preliminary Research of Environmentally Friendly Taxi Based on Comprehensive Evaluation in Macau SAR
Authors: Tam Lap Mou , Wong Pak Kin , Lao Hang Yuan , Xie Zheng Chao
Published: July 2012

To promote the green taxis in Macau SAR has being attractive because of the increasingly air pollution caused by vehicles’ emission. In order to improve the air quality and living condition in Macau, this paper shows us some environmentally friendly taxis to replace theconventional ones. In this paper, an overall picture of the current situation and tendency of world’s taxies is firstly presented. Secondly, the vehicle emissions of Macau taxi including environmentally friendly ones are detailedly demonstrated and compared. On the basis of feasibility, cost, safety and regulations related to Macau, the existing vehicle models are also comprehensively elaborated and evaluated. At the end of the paper, it will predict possible directions of the development of taxis in the near future of Macau. The analysis and evaluations of vehicle models are all considerate of what really Macau is.
The Study on Mechanical Design Based on Collaborating Method Using Grid
Authors: Feng Ren Yu , Duan Zhi Jian , Wang Min
Published: July 2012

A Grid-enabled solution in mechanical design is suggested in the paper. In the beginning, a brief introduction of three distinct phases in mechanical design, i.e., Preliminary Design, Structure Verification, and Performance Evaluation, is presented, followed by a typical scenario. This project is currently in progress. More features are expected to add into in the near future to enhance its strength and flexibility. The MEGrid has been proved to have significant practical value for mechanical design and its architecture in this paper highlights an approach for Grid technologies applications in engineering with distributed software packages involved.
The Product Design for Babies or Children in Ergonomics Perspective
Authors: Deng Ming Ming , Yang Wei
Published: July 2012

The product design for babies or children in ergonomics perspective was analyzed. Three aspects were discussed, including the anthropometry application, the design of the man-machine interface and the security. An example of product design for babies was given to explain it. And the perspective of the design of products for babies or children was put forward in the end
A Mathematical Model for Thin-Layer Drying of Litchi Pulp
Authors: Guan Zhi Qiang , Wang Xiu Zhi , Li Min , Jiang Xiao Qiang
Published: July 2012

A drying experiment of litchi pulp was done with a self-built heat-pump drying system. A few commonly-used thin-layer drying models for foods were linearized and fitted with the drying experimental data to select a relatively optimal model of depicting the relationship between moisture ratio and drying time of the heat-pump drying of litchi pulp. It was found that the Page model is relatively optimal. The multivariate linear regression approach was employed to solve for the parameters of the Page model based on experimental data and an experimental verification was conducted; the verification results show that the predicted values of the Page model have a good fitness with the measured values and thus the Page model can predict more accurately the moisture ratio and drying rate of litchi pulp in a heat-pump drying process.
A Mechanical Research on the Factors of Lob Shot of Football
Authors: Li Feng
Published: July 2012

In modern football games, a player's skill to lob for the goal is no less than critical as sometimes it is the difference between victory and defeat. In the process of executing a lob shot, following factors are to determine whether the shot is going to be successful: Distance from ball to goal—a, distance from the player to goal—b, height of the goal—h, maximum height the goalkeeper can reach—h, initial velocity of the ball V0, horizontal angle (emergence angle), air resistance and whether the goalkeeper moves in the process. In search of the ideal position to lob, the thesis has three discussions with models established respectively