bluuebunny/crossref_metadata_2025 huggingface dataset:
Development Trends and Future Prospects of Cut-to-Length Machinery
Authors: Gerasimov Yuri , Sokolov Anton , Syunev Vladimir
Published: June 2013

Over 30 years of cut-to-length harvesting machines experience have demonstrated their effectiveness to logging companies in the countries of the boreal forest zone; i.e. better labour conditions in terms of ergonomics and safety, and less environmental damage and reliability in combination with convenient operation and maintenance. The introduction of fully mechanized cut-to-length technology in Russia shows a number of challenges that reduces cut-to-length effectiveness. These include a lower productivity of harvester-forwarder chains and higher roundwood losses in comparison with the Nordic countries due to a number of objective and subjective reasons (service, training, forest management, motivation, etc). Wood harvesting machinery has developted in the Nordic countries in recent years. The major changes were in integrating the harvesting of logging residues and stumps into the traditional system. Future prospects of cut-to-length technology require the development of forest logistics and forest bioenergy, and better environmental compatibility of wheeled vehicles with forest loam and clay soils.
Study on the Key Technology for Large-Scale High-Performance CNC Vertical Broaching Machine
Authors: Chen Guo Jin , Ni Jing , Liu Ting Ting , Xu Ming , Lin Lu Gao
Published: June 2013

For the general broaching machines problems of structure bulkiness, poor cylinder synchronization, lack of optimization design, low-grade control system, low efficiency and operational reliability, the paper studied the structural optimization technology of the large-scale high-performance CNC vertical broaching machine, designed the new 360-degree high-load lateral rotary table, the axial-rotary multi-pass joint of the anti-leakage and the elastic-contact, and the modular slider rails, so as to improve the mechanical performance, the working stability and reliability. The remote network intelligent monitoring system and the multi-function data acquisition processor for the developed CNC broaching machine, realize the enterprise management information, the enterprise resource optimization, and the automation and intelligence of the manufacturing process.
A Summary of Research on the Linux Operating System
Authors: Wang Ya Jun
Published: June 2013

As the fastest growing operating system, Linux is applied in broader areas, and more and more people start to use Linux operating system. In allusion to the hot issues like Linux and UnixLinux and free softwares, Linux kernelLinux DistroLinux and embedded systemLinux and WindowsLinux teaching, the research results have been summarized in the article.
A New Method of Time Series Piecewise Linear Representation
Authors: Wang Qiang
Published: June 2013

To meet requirements of time data dynamic growth , and reflect the different effect to the different segment of time series over time, a new method of piecewise linear representation, called tangent piecewise aggregate approximation (TPAA) is proposed based on hyperbolic tangent function. The method can not only meet requirements of time data dynamic growth, but also reflect time property of the time series. Compared with the existing methods, TPAA method can effectively query time series online.
Pulse Exposure Timing Control Mechanism of X-Ray Machine
Authors: Xiao Han , Cheng Jing Hai
Published: June 2013

The paper analyses the basic exposure signal and types of X-ray machine, then propose a reusable pulse exposure timing control mechanism for X-ray machine, using of SCM program. It completes synchronization of X-ray machine pulse exposure and image capture.
Research on Siemens PLC Pulse Control
Authors: Wang Li Xia , Feng Zhan Rong , Zhang Ran Yang
Published: June 2013

In order to apply the PTO pulse function of Siemens PLC in a more systematic, convenient and effective way, this thesis adopts the position control wizard to generate envelop and control subroutine. The thesis also makes detailed descriptions and case discussions on the four subroutines of PTO0_CTRL, PTO0_RUN, PTO0_MAN, PTO0_LDPOS, and the results show that using the position control wizard can not only generate envelop and control subroutine conveniently but also bring convenience to the application of the subroutine. Especially, the parameters of the four subroutines interact both independently and mutually. If we make a deeper research on the parameters, we can master their relations further more and apply them more proficiently.
A Design Scheme of Operating System to Run Windows' Application Programs on Linux Platform
Authors: Wang Ya Jun
Published: June 2013

The realization of interoperability between Linux and Windows is beneficial to the development of operating system technology in depth and breadth. From such aspects as architecture, kernel module, user module,system call,device driver module and so on, this paper elaborates a design scheme of operating system to run Windows' application programs on Linux platform.
Time-Dependent Behavior of High Performance Fiber-Reinforced Concrete
Authors: Sprince Andina , Korjakins Aleksandrs , Pakrastinsh Leonids
Published: June 2013

This research deals with experimentally studied time-dependent deformations of polyvinyl alcohol (PVA) fiber reinforced high performance concrete (HPFRC). The creep in compression and crack propagation of the new concrete compositions were determined. Several kind of concrete mixes adding microsilica and nanosilica have been made. For each composition cylinders with dimensions 190x47mm and Compact Tension (CT) specimens with dimensions 150x150x12mm were prepared. Concrete specimens were tested in a controlled constant temperature and with a constant level of moisture. Creep specimens were put into a creep lever test stand and subjected to a uniform, constant compressive load but CT specimens were subjected to a tension load. Deformations and crack mouth opening displacements were measured with extensometers. The compression strength and modulus of elasticity also were determined. The results have shown that nanosilica dont have significant influence on the high performance fiber reinforced concrete time-dependent behavior.
Dynamic Analysis of Steel and Dural Drill Rods
Authors: Khajiyeva Lelya , Sergaliyev Almaz , Umbetkulova Aliya
Published: June 2013

The paper is dedicated to applied problems of dynamic stability of deformable systems. Dynamics of boring columns for shallow drilling (up to 500 m) applied in oil-gas extractive industry is considered. The purpose is investigation of influence of the drill rod's material properties of amplitude-frequency characteristic and stability of movement. Deformation of the drill rod is assumed finite. A model of a compressed-torsioned drill rod is considered within the nonlinear theory of finite deformations of V.V. Novozhilov. Dynamic of elastic movement for steel and dural drill rods applied in the extractive industry, resonant vibration modes and instability zone are investigated. The resonant vibrations of drill rods on the basic and higher (third) frequencies and their stability are calculated.
Sliding Mode Nonlinear Observer Design for Underwater Vehicle Control System
Authors: Deng Chun Nan , Ge Tong
Published: June 2013

The ocean current and cable will affect the ROV(remotely operated vehicle) when ROV is working under the sea. Current velocity and umbilical cable disturbing are hard to measure by sensors, which has to be estimated by observer. In order to improve the precision of observer, we present reasonable models for ocean current and umbilical cable disturbance, and design a sliding mode observer which has the same robustness as sliding mode controller. An upper bound of estimation error is derived by using Lyapunov stability criterion. Performance of the observer is verified using numerical simulation.Algorithm is very easy to complie,could meet the engineering needs.
Study on Pilot Transfer Function Model Gain of Closed-Loop Pilot-Vehicle System
Authors: Li Lin , Xu Jun , Zheng Fu Lei
Published: June 2013

Based on the analysis of pilot handling behavior characteristics, this paper establishes the pilot transfer function model. According to the characteristics of closed-loop pilot-vehicle system and the relationship between pilot and flight quality, the specific calculation method of pilot model steady state gain was given. Take the aircraft roll angle manipulation for example, and simulate the pilot's manipulation of aircraft of dynamic process. The results show that: the pilot model steady state gain calculation method is simple and feasible, and have a certain reference value for the analysis of closed-loop pilot-vehicle system.
A New Method Based on Position Sensitive Detectors to Measure Four-Degree-of-Freedom Geometric Errors of Linear Guide Rails
Authors: Song Qing , Wang Hong Ping
Published: June 2013

A novel method adopting position sensitive detector (PSD) and laser collimation technique to measure four-degree-of-freedom of linear guide rails is presented in this paper. The yaw and pitch errors can be obtained based on the relationship between output coordinates of horizontal PSD and angle of the mirror. Meanwhile, the horizontal and vertical straightness errors can be calculated by the relationship between output coordinates of vertical PSD and position of sampling points. Besides, BP neural network algorithm is used to correct the nonlinearity between actual and ideal output of PSD. The method is analysed theoretically in detail. The experimental results show that the four-degree-of-freedom of linear guide rails can be measured with high accuracy.
Experimental Study for Biogas Upgrading by Water Scrubbing with Adsorption Materials Used for Scrubber Packing
Authors: Huang Li , Hu Jian Jun , Jiao You Zhou , Lei Ting Zhou , Zhang Quan Guo
Published: June 2013

China have the biggest biogas yield in the world, but biogas quality is low and the utilizations of biogas are monotonous now, the shorting of appropriate upgrading technologies is impeding the developing and high quality using of biogas. With analog biogas as raw material, this study investigated biogas upgrading by water scrubbing with adsorption materials used for scrubber picking. Three sorts of packing-plastic hollow sphere, clay ring and zeolite pellet were chosen for the test and the experiments were operated under various pressures (0.65MPa、0.5MPa and 0.3MPa). The results showed that the adsorption packing could improve biogas upgrading effect, the removal rate of CO2 were better when use zeolite pellet( which have better adsorption) as packing compared with conventional plastic hollow sphere, and the results of clay ring(which have little adsorption) experiments were between the above two.
Design of Machine Tool Setting and Parameter Optimization
Authors: Xu Xiu Fen
Published: June 2013

To solve the existing problems in the NC machining process, the optimization design of cutting parameters in NC milling machine with genetic algorithm. With the maximum production efficiency as the optimization objective, the spindle speed, feed speed, milling width, depth and other parameters as optimal variables, establishes the optimization mathematical model of machine tool. The optimization results show that: parameters optimization can significantly improve the processing efficiency, and bring economic benefits for enterprises
Analysis on Characteristics of Minor Cycle Errors in Process of Grinding Involute Gears on Worm Wheel Gear Grinding Machine
Authors: Li Wen Long , Wei Li , Hu Hong Ying , Liu Jian
Published: June 2013

Usually, there are serious tooth-period errors in the process of grinding Involute gears on a worm wheel gear grinding machine. Being based on the process characteristics of grinding involute gears using a worm grinding wheel, radial errors and tangential errors of worm wheel gear grinding machine are analyzed. And conclusions for profile errors to be effected are given.
Design and Optimization of Dual-Redundancy Transmission System
Authors: Yu Bi Qiang , Zhang Ming , Wang Wen Rui
Published: June 2013

According to the special requirements of the redundant input drive system in the aerospace field, a scheme of dual-redundancy transmission system is presented and it meets the requirements that one axis can output movements no matter two input axes are working together or working alone. Based on the analysis of the scheme, structure design scheme is presented, and the matching relationship of gear teeth is derived to meet the requirement of transmission ratio. Then the multidisciplinary design optimization model of the dual-redundancy transmission system is established, in which the system is discomposed into two subsystems: differential gear train and fixed axis gear train. The multidisciplinary variable couple design optimization method of discrete variable is used in the optimal design of dual-redundancy transmission system and the optimal comprehensive scheme is obtained.
Dynamic Modelling and Simulation of Electromechanical Systems Based on Vector Bond Graph
Authors: Wang Zhong Shuang , Zou Hen , Tao Yang Yang
Published: June 2013

For the dynamic modelling and simulation of electromechanical coupling systems, the corresponding vector bond graph procedure is proposed. Based on the kinematic constraint relations of rigid body, the vector bond graph procedure for modelling spacial multibody systems with revolute joint is described. For the difficulties brought by differential causality in the system automatic modeling and simulation, the effective decoupling method is proposed. As a result, the unified modelling and simulation for electromechanical systems are realized, its validity is illustrated by the robot system driven by electrical motors.
Influence on Inertia the Moment of Inertia Matrix of Three Degrees of Freedom Air-Bearing Testbed
Authors: Li Yan Bin , Zou Ren Song , Jiang Tong
Published: June 2013

To improve the accuracy of attitude determination and control stabilization when simulating attitude motion of satellites in the space, the finite element model of the platform of 3-DOF spacecraft attitude control simulator was founded. Gravity field of air bearing testbed and formula for platform’s moment of inertia on the action of gravity was induced The result shows platform’s attitude accuracy error exist because of main principal axis of inertia change of direction.on the action of gravity, The more large value it is, the more error is .Error of inertia main axis changes as sine curve with the change of two horizontal Euler angle.
Intelligent Gear Fault Recognition Method Based on HWP Sample Entropy and Grey Incidence
Authors: Zhang Wen Bin , Su Yan Ping , Zhou Yan Jie , Min Jie
Published: June 2013

In this paper, a novel method to recognize gear fault pattern was approached based on harmonic wavelet package (HWP), sample entropy and grey incidence. At first, the line structure element was selected for rank-order morphological filter to denoise the original signal. Secondly, different gear fault signals were decomposed into eight frequency bands by harmonic wavelet package in three levels; and sample entropy of each band was calculated. Finally, these sample entropies could serve as the feature vectors, the grey incidence of different gear vibration signals was calculated to identify the fault pattern and condition. Practical results show that this method can be used in gear fault diagnosis effectively.
Introducing Digitization into the Continuous Cooling Transformation (CCT) Curves
Authors: Xu Yong , Liu Ke Gao , Fan Xiao Hong , Lei Shi , Xu Bin , Wang Fu Ming , Lin Jun Pin
Published: June 2013

Digitization of CCT curves by systemically using common softwares was studied and practiced to rebuild the digital patterns for teaching purpose. As treated in PC procedure, the CCT images printed in books were transformed into the digital data points, which can be read and record clearly and precisely in computer, extremely changing the appearance and precision of raw images. As the digital data, this digitized CCT curves can be conveniently introduced into the courseware, drawing more attendance and interesting from students than raw images. On the other hand, these digitized data also can be used as the CCT database for industrial applications, which can introduce automation into the thermal treatment industry. That is, the digitization of CCT curves will take great advantage of the improvement of teaching and promote the producing depth.
Magnetic Spring and Experimental Research on its Stiffness Properties
Authors: Xu Xiao Mei , Zeng Cai Min
Published: June 2013

Structure of one hybrid mono-directional magnetic spring was presented. Based on the experiment rig of magnetic spring the stiffness properties and its influencing factors were experimentally studied and analyzed. Research results show that the stiffness of the hybrid magnetic spring composed of the electromagnet and the permanent magnets is adjustable and controllable. As a whole the axial magnetic force of the magnetic spring increases non-linearly with the air gap between magnets decreasing, but within small air gap when there is considerable difference in magnetic flux density between the two magnets the axial magnetic force will decrease with the air gap decreasing, namely the magnetic spring behaves negative stiffness characteristics. The axial magnetic force is decided by the magnet with less magnetic field energy. And the adjusting range of axial magnetic force depends on the two magnets dimensions, their surface magnetic flux density and the magnetic saturation degree of the electromagnet. Furthermore, under same air gap the axial magnetic force of the magnetic spring increases linearly with the excitation coil voltage increasing.
Material Removal Property in Low Energy Ion Beam Etching
Authors: Ji Shu Hua , Li Xiao Zhou , Wang Da Sen , Yu Hua Dong , Wang Chun Yang
Published: June 2013

Ion beam etching can achieve nanometer size easily, processing in nanometer size, then put forward higher requirements on the workpiece surface. Ion beam etching is based on the Sigmund sputtering principle to remove the material, and the defects such as vacancies and interstitials in substrate material atomic lattice will be produced in this process. When these defects are enough, they lead to material damage. This paper is based on this effect to explore the effect of the processing parameters like Ar ion incident energy and incident angle of plasma beam on the implantation depth and the lattice change, through the SRIM software simulation which Ar ions used to the silica etching, moreover, forecast and put forward the suitable parameters for ion beam etching of nanocrystals on the workpiece, to produce the smaller nanowires damage.
Micro-Vibration Control for Ultra-Precision Isolation Platform of Large Grating Ruling Engine
Authors: Shen Yuan , Ge Xin Fang , Fan Nai Ji , Wang Yi Ying
Published: June 2013

Vibration is one of the key factors affecting the machining precision of ultra-precision grating-ruling machines. In this study a structural model of the ultra-precision two-stage isolation system of a large grating-ruling engine is designed according to the vibration characteristics of the grating-ruling engine, and an active vibration control system adopting the fuzzy adaptive PID controller (FAPIDC) approach combined with an air-springs system is applied to realize high performance in controlling complex micro-vibration. The stability of PID control and the flexibility and adaptability of the fuzzy logic controller (FLC) are both combined for FAPIDC, because the optimal values of PID parameters are obtained by using fuzzy sets. The simulation results confirm that the two-stage vibration control system using fuzzy adaptive PID control strategy has good isolation performance against disturbance. The control system has fast dynamic response, high stabilization precision and strong adaptive robustness.
Numerical Simulation of a Circumferential Cutting Warhead about Anti-Light Armor
Authors: Xu Yong Jie , Wu Guo Dong , Liang Shao Lei , Wang Zhi Jun
Published: June 2013

In order to improve the block area and damage probability to targets, a new type warhead of circumferential cutter is presented. The optimization simulation is designed for the circumferential cutter warhead by using LS-DYNA finite element software. The detonation mode and the liner curvature radius are two important factors, which influence the formation process of circumferential cutting warhead. The result shows that priority should be given to use the upper and lower ends at the same time blasting technique. The shaped charge liner curvature radius and shot elevation ratio should be controlled in between 0.9 and 1.1.The warhead can be envisaged to achieve the desire of circumferential cutting.
Optimization of Supply and Exhaust Stroke of the Electro-Pneumatic Changeover Valve
Authors: Ying Zhi Ding , Chu Yang , Qiu Xian Xiang , Sun Wei , Fang Yu Long
Published: June 2013

To optimize the supply and exhaust stroke of electro-pneumatic changeover valve (EP valve), a basic structure of proportional solenoid which used in the EP valve is designed, and a computational model of proportional solenoid and EP valve simulation model are established based on the AMESim. Then the electric magnetic characteristic curves of proportional electromagnetic valve and EP valve output side air pressure curves of different supply and exhaust stroke are obtained by simulations. Through the analysis of the simulation results to optimize the supply and exhaust stroke of the EP valve.
Research of Voltage Sag Propagation through Transformers
Authors: Li Xi Nian , Wang Yan Wen
Published: June 2013

Voltage sag is one of the most critical power quality problems. This paper calculates voltage sag propagation through YNd11 and Dyn11 winding connected transformers in series using symmetrical components, thus obtaining the voltage transfer matrix. Then the voltage sag propagation of single line-to-ground fault is computed using the transfer matrix. Simulation result proves the correctness of the analytical calculation, providing reference for the further study of voltage sag influence and estimation.
Research on Lifting Capacity of Truck Crane Based on Improved Bicubic Interpolation
Authors: Zhao Rui Xue , Shan Zeng Hai , Zhang Zheng De
Published: June 2013

To accurately compare lifting performance of different wheeled cranes , with discrete original sample data as source data, telescopic boom length and lifting radius as design variables, a surface interpolation mathematical model about crane lifting capacity is built based on improved bicubic interpolation method. On this basis, an analysis is done between a 80 tons truck crane and its upgraded product. The result indicates: under the working conditions of the telescopic boom and maximum counterweight, upgraded product lifting performance is improved significantly, more than 80% of the design points increase above 10%, more than 50% of the design points increase above 20%, and about 10% design points increase less than 7%. The analysis shows that the improved bicubic interpolation method is feasible to predict surface interpolation based on scattered points, it provides accurate data to wheeled cranes lifting performance comparison study.
Research on Nonlinear Vibration and Bend Strength Character of WN Gear Pairs in Meshing
Authors: Chen Dian Hua , Zhang Guo Qing , Chen Xi
Published: June 2013

In order to explore the dynamics performance of WN (Wildhaber-Novikov) gear transmission, according to the WN gear meshing transmission principle and the forced vibration theory with multi-mass and multi-degree of freedom, the nonlinear two degree of freedom forced vibration analysis model of WN gear pairs load meshing was established. Using vibration analysis and experiment, the meshing vibration behavior and tooth root bend strength of WN Gear were synthetically researched. The example calculation and the solution of the motion differential equations were completed by using numerical analysis method. The application foundation is improved for the dynamics design of WN gear transmission.
Secondary Cooling Water Distribution Strategy for Beam Blank Continuous Casting
Authors: Liu Qiang , Xue Wei Feng , Zou Bing Mei , Yan Jian Wu , Peng Xiao Hua , Cao Jian Feng , Chen Deng Fu
Published: June 2013

This paper focus on the water distribution of secondary cooling for beam blank continuous casting process. Analysis of the influencing factors and initial determination method for important parameters of secondary cooling water, including specific water, water ratio in each secondary cooling zoon and the amount of water in outer arc, inner arc and sider at one secondary cooling zoon. After that, according to the simulation heat transfer process of the secondary cooling, to improve the secondary cooling system is given. This work provides a reference to the development of secondary cooling system.
Study on a New Earth-Fault Distance Protection for Four-Circuit Transmission Lines on the same Tower
Authors: Guo Pei Yu , Yu Zhon Gan , Tai Neng Ling , Fan Chun Ju
Published: June 2013

Since the transmission corridors are becoming more and more valuable and the demand for transmission capacity is continually increasing, the four-circuit transmission lines on the same tower have been used more and more in the high-voltage system. For this complex transmission system, there is an unpredictable mutual inductance error when measures the impedance, which will potentially cause the mal-operation of relay. Therefore, it is not feasible to use the traditional earth-fault distance protection in case of the single phase to earth fault. In this paper, twelve-sequence components method is introduced to decouple mutual electromagnetic effect between four-parallel transmission lines. Based on the analysis of the features of each component, the relationship between fault voltage and the current is presented. Furthermore, a new protection criterion for earth-fault distance protection is proposed. The new method has high sensitivity and reliability under different scenarios.
Study on Dynamic Characteristics of Hydraulic Pressure System of MPM Tube Rolling Mill
Authors: Fang Gui Hua , Wang Jian Bo , Zheng Wen Shuai
Published: June 2013

Now MPM mill is widely used in hydraulic servo control technology in the field of seamless steel pipe production. But the hydraulic control system has the defect of complex control, bigger load power, more disturbance factors, higher response speed requirement and so on, which are unfavorable for analyzing the impact of factors of steel rolling precision. The conclusions show that: the system model is conducive to the analysis of the factors that affect the rolling accuracy, and it provides a theoretical basis for study the dynamic characteristics of the system, the optimal design and so on.
The Analysis and Application of Machine Tool Spindle Self-Grinding Method
Authors: Liu Chun Lin
Published: June 2013

The self-grinding method was adapted on the fine grinding machine spindle after the parts of machine tool were assembled, which was easy to guarantee the spindle datum plane geometric accuracy. The Self-grinding is a reliable and economical technology method. The turning accuracy of Machine Tool Spindle and grinding process system were analyzed to guarantee the grinding accuracy and cutting accuracy of the whole machine material.
The Angle Distribution of the Spheroid Particle upon Optical Surface
Authors: Gong Lei , Wu Zhen Sen , Yang Li Hong
Published: June 2013

The angle distribution of the spheroid particle upon optical surface is discussed in this paper. Taking the advantage of the Bobbert-Vlieger (BV) theorem, the scattering model between optical surface and spheroid particles is established. The scattering process is analyzed and the scattering coefficients are derived by using of the vector spherical harmonic function. The differential scattering cross section (DSCS) of a spheroid particle upon the optical surface is calculated which is compared with the Discrete Sources Method (DSM) proved the validity of the method and the influences of the incident angle and scattering angle on the DSCS are analyzed numerically in details. The results show that the influence of the incident angle on the scattering intensity is less at the smaller scattering angle, which can be concluded that the influence of the incident angle is more serious to the back scattering .The polarization effect and back scattering effect become weaker and weaker with the increase of the incident angle, which provide strong theoretical foundation to the nondestructive detector engineer.
The Design of Compound Die for the Drawing Parts with Holes in Flange
Authors: Nie Fu Rong , Wang Xia Bing , Tian Fei
Published: June 2013

Based on analysis and comparison of forming processes of drawing part with flange holes and a bottom hole, a compound die was designed which can blank, draw, punch a bottom hole, punch two flange holes, trim in the same forming-position. This compound die can improve the part precision and productivity. The key design points and the working process of the compound die were also discussed.
The Design of the Integration Intelligent Melting Point Apparatus
Authors: Bai Fang , Li Shan , Cheng Ke Yuan
Published: June 2013

this paper presents the basic operation principle, the hardware structure and software programming of the Integration of smart melting point apparatus, which composed by the microcontroller, temperature sensor, heating system, mixing system, keyboard and LCD display. After conducting repeated experiments, the results emerged: the temperature control accuracy of the instrument reach ± 0.2°C, linear temperature error is less than 0.5%. All indications comply with the national pharmacopoeia standards. With the character of simple hardware structure and scientific software algorithms, the temperature control can be achieved with low cost and high precision.
The Numerical Simulation Analysis of Tuyere's Temperature Field and Stress Field
Authors: Guo Xi Ping , Han Wen Yue
Published: June 2013

Research on the temperature field and stress field of tuyere by numerical modeling and analyse the influence of structure on tuyere's property.
A New Intelligent Fault Recognition Method for Rotating Machinery
Authors: Zhang Wen Bin , Su Yan Ping , Min Jie , Zhou Yan Jie
Published: June 2013

In this paper, a novel method to recognize rotor fault pattern was proposed based on rank-order morphological filter, harmonic window decomposition, sample entropy and grey incidence. At first, the line structure element was selected for rank-order morphological filter to denoise the original signal. Then, the six feature frequency bands which contain the typical fault information were extracted by harmonic window decomposition that needs not decomposition; and sample entropy of each band was calculated. Finally, these sample entropies could serve as the feature vectors, the grey incidence of different rotor vibration signals was calculated to identify the fault pattern and condition. Practical results show that this method can be used in fault diagnosis of rotating machinery effectively.
A Novel Method to Extract Carrier Mobility and Threshold Voltage in High-Voltage DDD MOSFETs
Authors: Chen Shen Li , Shih Hsin Yang
Published: June 2013

In this work, we apply the Hauser technique and combine a newer inversion layer charge model to extract the effective channel carrier mobility (μeff) and threshold voltage (Vth) of several high-voltage DDD MOSFETs with different dimensions in channel length and width. This paper proposes and demonstrates that our new method is a novel and efficient to extract the carrier mobility and threshold voltage in the DDD MOSFET, meanwhile, the extracted data is well consistent with UT model. And, only the extracted values by our new method and BCV method can clearly reflect the narrow-width effect which results from the so called LOCOS isolation technique. Therefore, it is clearly to see that our extraction technique can exactly reflect the device characteristics in high-voltage DDD MOSFETs.
An Integrated Numerical Model for a PEM Fuel Cell System
Authors: Ding Zhou Bo , He Li Ping , Dong Z. , Gao X.
Published: June 2013

PEM Fuel Cell (PEMFC) system plays an important role in a future hydrogen economy. Numerical modeling is useful to evaluate and optimize PEM fuel cell system. Therefore, this paper developed an integrated numerical model for predicting the power output of PEMFC system and optimizing system operation parameters to achieve the maximal output power. The developed numerical model integrated the models of fuel cell stack itself and its auxiliary systems, which were quantitatively described and analyzed with calculation equations. Furthermore, the newly developed numerical model was applied to a PEMFC powered scooter to estimate the output power a PEMFC system and optimize the operation conditions parameters of its auxiliary systems based on optimization algorithm. This validates that the developed integrated numerical model is useful and reliable for predicting the net output power and achieving maximal net output power through optimizing the operating parameters of a PEMFC system.
Band-Pass Digital Filter Window Function Method Design and Spectrum Leak Analysis Based on MATLAB
Authors: Zhao Xin , Ren Shan
Published: June 2013

In the digital signal processing process, the length of signal that we can get is limited, so should be infinite long time sequence limit in a certain interval, only choose one of the segment signal to carry on the analysis, namely cut off the signal, and this process is equivalent to add a window function to the signal is, using the window function truncation infinite unit sampling response sequence. This article in accordance with the principles of window function design method, based on analysis spectrum of the measured signal, design and analysis that add different window function on filter performance effect while signal intercept, and ultimately chose a suitable window function for the measured signal to the design of filter. Through the MATLAB simulation shows that the choice of window function can meet the measured signal filtering.
Study on Thermal Performance of a New Solar Air Heating Collector
Authors: Zhuang Zhi , Xue Jing , Ye Hai
Published: June 2013

The thermal performance of a new Solar air Collector with Colored Fins (SCCF) used for heating was studied. A macroscopic model was proposed based on the law of mass and energy conservation. The effects of the parameters such as dimensions of SCCF, fin angle and material of the fins on the outlet air temperature, airflow rate, effective energy and thermal efficiency were discussed. The results indicate that thermal performance of SCCF can be obviously improved by the increases of aspect ratio, fin angle and vent size. The air flow rate is the dominated factor affecting effective energy and thermal efficiency of SCCF. All these study can be used for guiding the design of SCCF.
Parameters Study for Composites Forming Infusion from inside and outside at Same Time
Authors: Du Wei Xiao , Shan Zhong De , Liu Feng
Published: June 2013

Potential benefits of advanced composite materials, such as 3D composites, include reduced weight, superior stiffness, and good design flexibility [. 3D composites is weaved the fibers into preform firstly and then impregnated to a part. The impregnation quality is a key factor to the part performance; some imperfections resulting from it affect the integration, which limit its usages in aerospace, national defense and other areas. The infusion from both inside and outside at same time (IIOS) is suggested to improve the quality and increase the filling efficiency.
Research on Application of Intelligence Schedule of City Pubic Traffic Vehicles Based on Genetic Algorithm
Authors: Chen Rui , Fang Liang
Published: June 2013

Giving attention to the benefits of the passengers and agency, this paper adopts the true value of the coding method using the start time as the variable and uses the penalty function method to add a variety of constraints to the objective function when constructing the fitness function,which simplifies the calculation. Finally, the simulation results are obtained by using the improved Genetic Algorithm for solving the non-uniform grid schedule. Results show that the improved Genetic Algorithm can find the approximate best result in the huge search space of optimization, and greatly increased the computational efficiency.
The Power Spectrum Estimation of the AR Model Based on Motor Imagery EEG
Authors: Zhao Li , He Yang
Published: June 2013

This paper uses three common AR model power spectrum estimation algorithms which are the Yule-Walker method, the burg method and the improved covariance method. Taking Matlab as a tool, the corresponding algorithms are used to carry out the power spectrum estimation of motor imagery EEG, the relationships and distinctions between the spectrum charts are compared in order to find the relatively appropriate algorithm for analyzing the EEG, which aims at providing a theoretical guidance for processing the motor imagery EEG and laying a foundation for further research.
Equipment Support Training Level Evaluation Method based on ANFIS
Authors: Zhao Wu Kui , Zhang Cheng , Wang Yi Bo
Published: June 2013

The evaluation of equipment support training is an effective way to improve training efficiency. The main influencing factors of equipment support training are analyzed. Adaptive neural fuzzy inference system (ANFIS) model structure is established and the hybrid-learning algorithm to solve the established model by applying back-propagation and least mean squares procedure is investigated. Then the evaluation model of equipment support training level based on ANFIS is constructed. The training level consistent with the actual training level is achieved by training the proposed model using training data samples, which verifies the correctness and effectiveness of the proposed method. Simulation comparing analysis using the proposed method and BP neutral network is conducted respectively. The superiority of the proposed method is verified by simulation results, which provides an effective method for equipment support training evaluation.
Parametric Design and Automatic Adjustment Technique of Engineering Drawing Based on SolidWorks
Authors: Geng Jian Pu , Cui Hong Bin , Liu Xin Yong , Cao Kan , Cao Peng Xian , Liu Qing Hua
Published: June 2013

Further development of SolidWorks with VB is carried out in this paper. Program and dimension driving methods are utilized for parametric design to realize the automatic generation of three dimension component and engineering drawing in SolidWorks. Intelligent generation of drawing is achieved by adjusting the view scale of engineering drawing, generating view size and cutaway view in order to improve the design efficiency and quality.
Design for Energy Optimization Method Based on Energy Unit
Authors: He Ping , Chen Cong Sheng , Ma Yu Ping , Wu Zhong Wei
Published: June 2013

Design for energy optimization is an efficiency way to improve energy utilization rate and the environmental performance of products. A new design method for energy optimization based on energy unit (EU) is put forward. The method integrates energy property into design process of product, and takes the product as a set of design units and realizes the design for energy optimization process by the design of EU. Based on the introduction of the concept EU, the design for energy optimization process in the utilization stage is analyzed. At last, a product case is given to show the design process.
Preparation and Luminescence Properties of Rare Earth Magnesium Strontium Silicate Luminescent Fiber
Authors: Luo Jun , Liang Chao , Gao Da Hai , Zhang Kai Yan
Published: June 2013

The polypropylene luminescent fiber containing Sr2MgSi2O7: Eu2+, Dy3+ phosphors was prepared by melt-spinning method. Crystal phase structure, spectral features and afterglow properties of the luminescent fiber were tested and analyzed. The results show that the fiber has independent superposition phase features of both Sr2MgSi2O7: Eu2+, Dy3+ and polypropylene; the range of its excitation light wavelength locates among 250~450 nm; it can emit blue light of 460 nm wavelength; its initial luminescent intensity is more than 600 mcd/m2, and afterglow time lasts 7 h; the process of afterglow decay consists of fast stage and slow stage.
Study on Driving Fatigue Based on Ergonomics
Authors: Qi Ji Yan
Published: June 2013

In order to reveal the underlying theoretical reasons for that the traffic accidents are caused by driver fatigue, this paper specifically represents the formation and mechanism of driving fatigue. From the point of Human Factors Engineering, the driver’s physical system of bearing the driving load is constructed based on fatigue theories. In addition, the driving behavior is divided into three stages. Then the fatigue generated by each stage is strictly divided into mental fatigue and physical fatigue. According to the extent of driving fatigue, the status of driver's fatigue is divided into four types, thus, a cumulative mode in driver fatigue is constructed.
Preparation ZnS Quantum Dots via Water-Phase Synthesis Method
Authors: Liu Wei , Chen Xian Lan , Zhang Ju Cheng , Long Yun Hui , Shi Ling , Wu Na
Published: June 2013

With water as the medium, PVP as stabilizer and ammonia as complexing agents and adjusting pH value of the solution, we report an all-aqueous synthesis of highly photoluminescent and stable ZnS quantum dots (QDs) by water-phase synthesis reaction between ZnCl2 and NaS at different temperatures and times. The optimal reaction conditions of PVP-capped ZnS QDs were obtained through experiment as follows: the concentration ZnCl2 and NaS solution both are 1 mM, (PVP):(ZnCl2) = 0.0167 (v/v), (NH3):(ZnCl2)=1:300 (v/v), the optimal reaction temperature is 40 °C, the optimal reaction time is 30 min. With ammonia as complexing agents, Zn(OH)2 can dissolve in ammonia and form to complex ions ((Zn(NH3)4)2+), which make Zn2+ release slowly to control the nucleus growth rate of ZnS, thus obtain small size of nanoparticles. The fluorescence spectra shows that the emission peaks of ZnS QDs around ~395 nm and ~470 nm on the emission spectra, which are consistent with literatures, so nano-ZnS QDs was synthesized successfully in this paper.
Research on Interfacial Assembly of Some Trigonal Schiff Base Amphiphiles in LB Films
Authors: Xiao Yong
Published: June 2013

Some trigonal Schiff base amphiphiles with symmetric aromatic cores and different substituted headgroups were designed and their interfacial assemblies were investigated. When on the metal ions subphases, an in situ coordination can occur for all compounds. The coordinated films could be transferred onto solid substrates and subsequently characterized by morphological characterization with atomic force microscopy measurement. Depending on the trigonal molecular structures and different substituted headgroups, these amphiphiles showed distinct assembly behaviors in the organized molecular films.
Study on Aging Resistance Properties of Natural Rubber Dried by Microwave
Authors: Wang Yong Zhou , Zhang Fu Quan , Huang Mao Fang , Chen Mei , Gui Hong Xing , Zeng Ri Zhong
Published: June 2013

In this work, thermogravimetry (TG) and Wallace plastometer were used to study the thermal-oxidative aging resistance properties of natural rubber (NR) dried by microwave and hot-air. Showed from the results, thermal degradation temperature, primary thermal-oxidative degradation temperature, the value of P0, PRI and VR for NR dried by microwave were higher than those of NR dried by hot-air; the thermal-oxidative aging resistance properties of NR vulcanizes dried by microwave improved significantly, and the rate of change for elongation at break (-26.76%) and tensile strength (-38.6%) of NR vulcanizes dried by microwave before and after aging were apparently higher than those of NR vulcanizes dried by hot-air, which were (-60.29%) and (-82.11), respectively.
Study on the Yield-Thixotropy of Waxy Crude Oil under Uniform Sweeping Rate of Share Rate
Authors: Guo Li Ping , Liu Mo Xiao , Xu Gui Ying
Published: June 2013

Yield-thixotropy is an important time dependent rheological behavior of gelled waxy crude oil. In order to study the yield-thixotropic behavior of gelled waxy crude oil under cyclic shearing of linear increasing and decreasing of shear rate, four different types of waxy crude oil were studied experimentally by using RS150H rheometer. It is found that because the recovery rate of wax crystal structure is slow, study should be focus on the first loop. At a certain temperature, the hysteresis loop moves away from the share rate axis and the area of the loop becomes larger with increased rate of share rate sweep; and vice versa, the loop moves toward the share rate axis and the area of the loop becomes smaller with decreased rate of share rate sweep. And the yield stress is also reduced and the yielding time increased with decreased rate of share rate sweep. In addition, based on the experimental results an empirical correlation is developed to describe the relationship of yielding time and rate of share rate sweep.
The Bioactivity of Gradient Composite Bioceramic Coating with Different Contents of Multiple Rare Earth Deoxide Fabricated by Wide Band Laser Cladding
Authors: Zhang Ling Yan , Liu Qi Bin
Published: June 2013

To improve bonding strength between titanium alloy and coating and to eliminate thermal stress during laser cladding, a gradient coating materials is designed. And the gradient coating with different contents of multiple rare earth deoxide was produced by wide band laser cladding technique. The experimental results indicate that when addition of Sm2O3 is fixed to 0.3wt.%, as addition of Y2O3 increases, the microstructure of bioceramic is different. When addition of Y2O3 reaches 0.4wt.%, the amount of Ca-P based bioactive phases such as HA, α-TCP as well as β-TCP becomes biggest. After soaking the coating with 0.3wt.% Sm2O3 and 0.4wt.% Y2O3 in SBF for 14 days, a large amount of Ca-P white spherical particles can be observed on coating, which demonstrates the bioceramic coating is of best bioactivity.
Characterization of Tri-(1, 4-Butanediol Single-Butyrate) Citrate as a New Plasticizer for Poly(Lactic Acid)
Authors: Wan Tong , Du Tao , Zhang Si
Published: June 2013

Tri-(1, 4-butanediol single-butyrate) citrate (TBBC) was synthesized as a new plasticizer for PLA. The chemical structure of TBBC was characterized by FT-IR. PLA was plasticized with various amount of TBBC. The effects of both temperature and shear rate on the rheologies of PLA/TBBC blends were evaluated by a parallel plate rheometer.
Electrical Transport Properties in Ta-Doped SnO2 Thin Films
Authors: Wu Hai Bin , Gou Bing Ping , Zhang Hai Lian , Han Wan Qiang
Published: June 2013

The structure, carrier concentration and low temperature magnetoresistance of Tantalum-doped Tin oxide thin films prepared by RF magnetron sputtering method have been investigated. Hall coefficient is negative at all measuring temperatures, which confirms the n-type characteristic of the films with metallic characteristic. The low temperature magnetoresistance measurement show negative magnetoresistance at all measured temperatures from 2 to 30 K. However, weak-localization theories can not explain the behavior of the negative magnetoresistance of our samples. We fitted the magnetoresistance data of the samples with semiempirical expression that takes into account the third order sd exchange Hamiltonians. The theory and experiment are in excellent agreement. This strongly suggests that the magnetoresistance in SnO2: Ta film originates from the scattering of conduction electrons due to localized magnetic moments.