bluuebunny/crossref_metadata_2025 huggingface dataset:
The Studies on Numerical Simulation of Unidirectional Solidification Process in 23t Steel Ingot
Authors: Ao Guang Wu , Shen Ming Gang , Zhang Zhen Shan , Hong Li Li
Published: April 2012

In this paper, by using the commercial finite-element software of ProCAST, unidirectional solidification processes in 23t steel ingot were simulated. Emphasis is placed on analysis of required time for complete solidification of steel ingot and temperature distribution about ingot and side wall during the solidification process. By comparing simulation values and measured values of side wall during the solidification process, the simulated results conclusively demonstrate that our developed model is feasible and valuable.
Influence of Material Thickness to the Dynamic Mechanical Properties of Bioprosthetic Heart Valve
Authors: Huang Xu , Yuan Quan , Cong Hua , Ma Hai Bo , Ye Xin
Published: April 2012

The paper constructs one type of bioprosthetic valve leaflets’ parametric model via computer aided design, a series of accurate parameters of the bioproshtetic heart valve, such as radius of the sutural ring, height of the supporting stent and inclination of the supporting stent, are determined. Numerical simulation is used to determine the effect of one shape design on the mechanical performance of the bioprosthetic valve leaflet. The stress with a shape under the same load is analysed and the thickness of the leaflets 0.5mm and 0.6mm is compared by us. We creat a ellipsoidal surface in accordance with geometrical features. The experimental results of the finite element analysis show that stress distribution of the same bioprosthetic heart valve leaflets with different thickness is different. The maximal primary stress with the thickness of 0.5mm is lower than the others. This work is very helpful to manufacture reasonable shaped valvular leaflets and to prolong the lifetime of the bioprosthetic heart valve.
Study on Friction Reduction and Wear Resistance Process and Composition of FeS Solid Lubrication Duplex Layer
Authors: Hu Chun Hua , Zou Jia Ping , Qian Jiu Juan , Jin Ding Yun , Sun Xiao Feng
Published: April 2012

The composition of FeS solid lubrication duplex layer on 45 steel surface was studied by using SEM, EDS, AES and XPS. The results show that the sulphurized surface layer of FeS solid lubrication duplex is composed of the sulphide aggradation layer deposited on the nitrocarburized sub-surface layer and the sulphide diffusion layer formed by some S element infiltrating the nitrocarburized surface. The sulphide aggradation layer is mainly composed of FeS and FeS2, the key composition of the sulphide diffusion layer is FeS, and Fe(2/3/4)N is the key composition of the nitrocarburized sub-surface layer. The result of friction reduction and wear resistance test combined with the composition of FeS solid lubrication duplex layer explains that the friction coefficient and wear volume of the duplex layer are lower than those of the plain surface, which attribute to the relatively softer sulphurized surface layer provided self-lubricating property while the harder nitrocarburized sub-surface layer provided sufficient load bearing capacity in view of resistance to plastic deformation, so that spallation failure of the sulphurized surface layer can be effectively avoided, and they exert excellent friction reduction and wear resistance functions in different moments during rubbing process respectively.
Researched on Dielectric Properties of Alumina Substrate Material
Authors: Guo Chen Jie , Zhang Chang Song
Published: April 2012

In this paper, Al2O3-Bi2O3was choosed as chip fuse matrix material. Composition of Al2O3-Bi2O3ceramics samples in different sintering temperature was studied by X-ray diffraction, and dielectric properties of samples under different frequency was measured. The results show that the mixture of Bi2O3in Al2O3ceramics can improve the sintering activity of Al2O3ceramics, and thus greatly reduced the ceramic sintering temperature. It is concluded that the main crystalline phase is pure α-Al2O3without miscellaneous phase distribution. The distribution of fracture morphology is uniform without the existence of apparent stomatal, the dielectric constant and dielectric loss was studied.
Study on Temperature Sensibility of Nano-Copper/Paraffin Materials
Authors: Lou Bai Yang , Ma Qiong Tong , Kong Shui Long , Xu Bin , Dong Fang Liang
Published: April 2012

In this paper, nano-copper/paraffin thermosensitive composite materials were prepared by high-energy ball milling, and pressed into the glass cylindrical tube by hot press molding. The micro-morphology and particle shape and microstructure of composite particles were observed by SEM, FI-IR, etc, the temperature sensibility of thermosensitive composite materials were tested by self-manufactured thermosensitive testing device. It shows that the way by which high-energy ball milling are prepared, the composite particle coated with good results, dense arrangement of particles, copper particles on the paraffin structure does not produce damage. With copper mass ratio increasing, the thermal conductivity of temperature sensitive composite is improved.
Calculation and Analysis of Drive Torque of Axial Magnetic Drive Mechanism
Authors: Xu Qiao , Mei Shun Qi , Li Gang Yin
Published: April 2012

The magnetic circuit parameter design problem was proposed aiming at axial magnetic drive mechanism driving torque. Analyzed axial magnetic drive mechanism driving principle .According to the mathematics model of the magnetic coupling torque that was established based on the equivalent magnetic charge theory, analyzed magnetic circuit design, included material selection, magnetic circuit type, the working air gap of magnetic circuit, magnet and the thickness of the magnets and resistive magnets. The basis was provided for the rational design of high-performance axial magnetic drive mechanism.
Temperature Field Analysis on the Hydrodynamic Retarder of Heavy Vehicle
Authors: Yuan Zhe , Ma Wen Xing , Cai Wei , Fan Li Dan , Song Jian Jun
Published: April 2012

According to the working characteristics of the hydrodynamic retarder, the hydrodynamic retarder D300 is chosen in this research. Based on three-dimensional flow theory, the internal temperature fields of hydrodynamic retarder with different liquid-filled ratios of 100%, 75%, 50%, 25% are numerically simulated. The standard k-ε model is chosen as turbulent model for calculation. The SIMPLEC algorithm is chosen as velocity-pressure coupling algorithm and the second order upwind scheme is used as discrete method. The mixture multiphase model is used to calculate the unsteady gas-liquid two-phase flow in the condition of partial charging. Through simulating and analyzing, it provides an important theoretical basis for the heat exchange of the hydrodynamic retarder at different gears.
Study and Simulation of the Model about High-Speed Maglev Drive Needles
Authors: Wu Xiao Guang , Kong Ling Xue , Zhu Li , Fu Jun , Yang Yi Min
Published: April 2012

Based on the magnetic suspension theory, this paper has proposed a kind of suspension-type jacquard needle driving principle, and designed its 3-dimension model method. By making finite element analysis on suspension-type needles, analyzing the experimental data and designing the structure, we can get the relationship among related parameters under conditions of different permanent-magnet thickness and air gaps, which can provide criteria in theory and application for designing on new needle driving principle, control system and needle.
Based on the Deep Hole Processing System Resonance Test Design of the Device
Authors: Shu Liu Yan , Feng Liu Zhan
Published: April 2012

Deep hole processing system resonance test devices can accurately and quickly find the whole system resonance frequency, for use of negative pressure device system to processing components provided a convenient, makes the precision of parts is further improved.
Electric Vehicle Tire Slip Identification Method Based on Self-Adaptive Kalman Filter
Authors: Zhou Si Jia , Long Jiang Qi , Xia Jing Yan , Su Zhong Gen
Published: April 2012

Based on the traits of the four-wheel drive EV, a self-adaptive Kalman filter was applied to gain the information of vehicle velocity and traction forces on four wheels. With the estimated vehicle velocity and the driving forces on four wheels, the slope k of the curves of adhesion coefficient versus slip rate could be calculated and consequently the road adhesion condition could be accurately identified. Through calculating the difference between the estimated slope k with the optimized slope k as a control reference, the output torques of the motors were adjusted instantaneously to improve the using rate of the adhesion as well as the rationality of the traction control strategy. Simulation results illustrate that whether on high adhesion or low adhesion roads the vehicle is passing, the strategy can estimate the k effectively.
Experiment Research and Analysis of Transmission Error of Gears
Authors: Cheng Jun Hong , Liang Mu , Fan Fu Ling
Published: April 2012

Through testing the errors of spur gear and helical gears, transmission error curve of non-grinding gear is drawn. The effect factors on gear transmission error are found. The transmission error effect factors of all kinds of gear high-low frequency are analyzed. It is obtained that gear kinematic error is the evaluating guideline of transmission precision. Experimental results shows that error of gear axial offset and gear frequency period have less effect on gear transmission kinematic error. While gear backlash and face width direction error have more obvious effect on kinematic error. The results provides reasonable theory basis for determining gear cutting precision.
Correlated and Coherent Analysis Based on Vibration Data of Fatigue Life Test Rig for Ball with Three Point Contact
Authors: Zhou Jing Ling , Li Yu Jing , Zuo Wei Ming , Zhu Wei Nan , Ren Ru Song
Published: April 2012

The exciting input signals of the parts in a fatigue life test rig for ball with three point contact and the system’s output signals were analyzed by auto-correlation and cross-correlation with MATLAB software, which eliminated the impact of noise to a certain extent and got the response signals of same frequencies caused by exciting input signals. Finally, the result showed that the text rig was linear by coherent function analysis, which provided the theory basis for modal and dynamic analysis further.
Expermental Research on Compression Strength of Recycled
Authors: Yu Fang , Yin Can Bin , Jiang Min
Published: April 2012

Experimental work for the compressive strength of recycled aggregate concrete was designed. The results indicated that the recycled coarse aggregate (RCA) re-placement ratio has a remarkable influence on the compressive strength of recycled aggregate concrete.the relationships between the compressive strength and themw/mcratio are also different for differentRCA replacement ratios and the developments for the compressive strength of recycled aggregate concrete are not exactly the same as that of normal concrete.
Knowledge Acquisition of Spindle Bearings Fault Based on Rough Sets
Authors: Xie Xiao Zheng , Zhao Rong Zhen , Yang Li , Yao Yun Ping
Published: April 2012

An identification method of spindle bearing fault based on rough sets theory is proposed in the article. By collecting bearing’s typical fault signal and using signal information processing techniques, vibration fault data is obtained. Then, equidistant clustering analysis method is introduced into discretization of experimental data of continuous attributes. In this way, vibration fault data table meets the requirement of rough sets data analysis. Besides, attribute importance algorithm is used in order to realize the reduction of condition attribute in the decision table. Thus, fault information which hidden in huge signal data is extracted. Therefore, simple and clear fault pattern rules are acquired. The result indicates that the method can realize fault pattern identification of spindle’s bearings and it is of great application value in practical fault pattern identification.
Fracture Energy of Refractories
Authors: Qian Fan , Li Hong Xia , Liu Guo Qi , Yang Wen Gang , Yang Jin Song , Yu Jian Bin , Ma Tian Fei
Published: April 2012

This paper introduce the relationship between fracture energy of refractories and its thermal shock resistance, and research status about fracture energy of refractories. It shows that investigation on fracture energy of refractories at high temperature is positive significance for evaluation of thermal shock resistance, and wedge splitting method for fracture energy of refractories is an effective method.
Study on the Error of Four-Position North Seeking System Based on the Single Axis Fiber Optic Gyroscope
Authors: Duan Ke Ke , Li Deng Hua , Pei Ren Zhong
Published: April 2012

The method to analysis the influence of error sources on the fiber optic gyroscope north seeker is presented in this paper. The influence of various error sources of the north seeker are investigated comprehensively. The simulation results indicate that the precision of gyroscope is the most important influence factor; the influence of the position rotation error and mounting error are greater than that of the inclination angle measurement error. Based on the analysis, the advisable scheme to improve the accuracy of the four-position north seeker is proposed. The experimental results met the accuracy requirement well, which proved that the compensation and error analysis method in this paper are effective and feasible.
An External-Electrode Flat-Panel Lamp for LCD Back-Lighting
Authors: Wang Qi Guan , Cang Xiang Hui , Wang Su Min , Li Jian Ping , Chen Wei Xing
Published: April 2012

In this paper, a flat back-light in which has no electrodes was developed. This back-light was fabricated by two flat glasses in which the pure Xe (at pressure of 150 Torr) was sealed, with a layer of commercial water on the out surfaces of the glasses as the external electrodes, where the glass with thickness of 1.2 mm was used as the dielectric barrier. The white light was available by exciting the phosphor layer with the plasmas introduced by high-frequency voltage, whose luminance was 4000 cd/m2, accompanied with the lighting homogeneity over than 92 %. The effects of driving voltage and the discharge space in the samples on the lighting characteristics of the back-light were comprehensively evaluated.
Investigation into Normal Pressure during Electrorheological Fluid-Assisted Polishing
Authors: Zhao Yun Wei , Zhang Lei , Yang Zhuo
Published: April 2012

The normal pressure in polishing area is investigated in electrorheological (ER) fluid-assisted polishing process. Under the influence of the non-uniform electric field, the dielectric particles in the ER polishing fluid are polarized to form the rigid core attached to the tool electrode due to the ER effect. In this work, the rigid core generated by the gathered mass of ER polishing fluid on the tip of tool electrode with the applied electric field is analyzed. The material is removed by abrasive particles under the effect of normal pressure and velocity. Based on the theory of hydrodynamic lubrication, a mathematical model taking into account the normal pressure is derived. Further experiments about the normal pressure experiments changing with the applied voltage, spindle rotational speed and working gap are conducted and the experimental results are compared with the theoretical results, which confirm the validity of the presented model
Research on Calculating Methods of Jacking Force with High Temperature Closure for Continuous Rigid-Frame Bridge
Authors: Yin Can Bin , Yu Fang , Jiang Min
Published: April 2012

When the continuous rigid frame bridge’s actual closure temperature is higher than the design closure temperature, the closure temperature’s difference will cause horizontal displacement at top of pier , and cause the structure to have the temperature intennal force. A horizontal jacking force is exerted to eliminate the adverse effect of closure temperature’s difference. One calculating method of jacking force is proposed in this paper: Eliminating the horizontal displacement at top of pier method. Taking the Longtan River Bridge as a practice example, the high closure temperature’s horizontal jacking force is calculated according to the method separately in this paper.
Time Effect of Vacuum Treatment on Activity Index of Horseradish Peroxidase
Authors: Xu Qiang
Published: April 2012

The time effects of different vacuum treatment on the activity index (RZ=A403/A280) of the horseradish peroxidase (HRP) was investigated experimentally via the ultraviolet-visible spectroscopic techniques. The results have shown that Ultraviolet-Visible (UV-Vis) spectra have been changed obviously. Experimental results indicate that the conformation of HRP can be changed by vacuum. The activity index decrease possibly was caused by the conformation variations of HRP.
Adaptive Control Based on Neural Network for Ship Sterring Autopilot
Authors: Hu Guan Shan
Published: April 2012

The Autopilot is importance for a ship to navigate safely and economically, so we proposes an intelligent reference modeling adaptive controller for ship steering based on neural networks. In order to satisfy the requirements of ship’s course control under various sea status, we used fuzzy logic and neural networks to design the feedback controller, used multilayer perceptron neural network to design the reference model and the identification network. In order to enhance adaptive characteristics of the controller，the parameters of membership functions and connection weights etc were revised online with neural network learning algorithm. The results of simulation shown that the performance of the ship controller is valuable and effective.
Anti-Swing Control of Container Crane Based on CMAC-PID Controller
Authors: Su Ya Li , Wang Xi Huai , Xiao Jian Mei
Published: April 2012

This paper establishes the mathematical model of the system of container crane, and then introduced the CMAC and PID compound control principle and characteristics, and PID control of the position of the container crane , CMAC-PID control of the position of the container crane, and CMAC-PID control of container crane's position and angle. The simulation results show that the crane based on the CMAC and PID compound control has a very good positioning and anti-swing effect.
Airport Damage Assessment Based on Uncertain Information
Authors: Chen Xia , Liu Min , Li Lin
Published: April 2012

With respect to airport damage assessment problem, the analysis method is proposed. The airport damage is assessed according to the secondary fuzzy comprehensive evaluation model. Then the evaluation method of target damage level is given by the compare methods of interval numbers. Finally, the example calculations are given to demonstrating the effectiveness of this method.
Design of the Power Parameter Measurement System Based on SOPC
Authors: Tong Zhan Ying , Mao Jing Kui
Published: April 2012

In this paper the SOPC technology is applied to the power parameter measurement in a FPGA chip. The Fast Fourier Transform (FFT) algorithm implemented in the FPGA is the theory basis of the system, and the 32 bit NiosⅡ soft CPU nuclear is embedded in the FPGA, which can realize the functions of power signals samping, data processing, storage, display and so on. The experimental result shows that processing precision meets expectations, and achieving requirements of the real-time system, with advantages of high integration and flexible reconstruction.
Digital Control System Design of Carving Machine Based on DSP
Authors: Ni Zhong Jin , Fang Liang , Chen Mao Jun
Published: April 2012

A digital control system of high-precision carving machine is presented in this paper. According to the requirements of high-precision caving machine, a servo motor controller based on the field orientated control (FOC) strategy is applied. Thus the high-precision control system base on DSP of electronic carving machine is realized. The results of system operation are shown that the control system and the servo motor controllers can run steadily and precisely. The system also represent that inter - connected controls parameters of this system were correct and valid, the control method was proper and effective
Research on Measuring Method of the Thickness of Quartz Bulb Shell Based on Hall Effect
Authors: He Rong Kai , Meng Hu
Published: April 2012

The hall sensor based on Hall Effect is in direct proportional to hall voltage produced under different magnetic field intensity, and the measuring probe designed according to principle of Hall Effect is used to measure the thickness of metal halide lamp arc tube quartz bulb shell. It is required to place magnetic steel ball in the bulb, the distance between the magnetic steel ball and probe is the thickness of bulb shell, which is in direct proportional to hall voltage produced by hall sensor in the magnetic field of magnetic steel ball. It is required to make use of single-chip machine, A/D converter, amplifier and others to constitute as a hardware circuit to conduct collection, data processing and value conversion for hall voltage and use LCD to show the thickness value of bulb shell.
Model Predictive Control of Flight Arrival Interval
Authors: Yang Da Peng , Sun Ping Bo , Hua Ke Qiang
Published: April 2012

In order to achieve the automation of Air Traffic Control (ATC), use system to identify the controlled model of flights arrival process which has been already built, using Model Predictive Control (MPC) of the dynamic matrix contro1 (DMC) to control the ATC process. According to DMC algorithm and the features of ATC, the design parameters of this system can be determined by a lot of simulations. It proves that the system design and parameters selection make the system has the required performance and the robustness even if the parameters be changed in a wide range. The experiment on the ATC Simulation System proves that the MPC method is available, conclusion of the study provides a new idea and method for the engineering implementation of the automation of flights arrival process control and some improvement of airspace utilization.
Robust Fault Detection for Network-Based System with Time-Varying Bounded Delay
Authors: Chen Li Min
Published: April 2012

A robust fault detection approach for network-based system is discussed in this paper. The fault detection problem is converted into fault detection filter design. The network-induced delay is assumed to have both the upper bound and the lower bound, which is more general compared with only considering the upper bound. The Lyapunov-Krasovskii functional and the linear matrix inequality (LMI)-based procedure are adopted to design the filter. And the filter can guarantee that the estimation error satisfies the H∞ constraint. Fault detection filter is designed for a flight control system and the effectiveness is verified by the simulation results.
Family Use Wireless Router Typical Fault Analysis Research
Authors: Peng Hai Shen
Published: April 2012

In view of the family use wireless router in network turning on and the use process common breakdown, this paper systematically analyzes the wireless router causes of network failure, Six methods proposed to solve home wireless network router failure methods and procedures, And wireless network management and maintenance skills of daily, Shows the configuration of the wireless router and network connection troubleshooting typical case, Designed to help users quickly resolve wireless network failure.
Review of 3D Shape Measurement Using Fringe Projection Techniques
Authors: Yu Ming Rang , Zhang Ying Jie , Zhang Ding
Published: April 2012

Optical measurement has been widely used in many fields of science and engineering, such as CAD/CAM, machine vision, quality inspection, reverse engineering, etc, due to its properties of non-contact and high speed. Fringe projection methods have caused much more attentions in full field measurement and insensitive to the change of the objects’ reflectivity. This paper reviews state-of-the art progresses in the 3D shape measuring methods using fringe projection techniques. A comparison of the existing methods is performed with their advantages and drawbacks also are pointed out.
Robust H∞ Filtering for Stochastic Networked Control System with Nonlinearities and Missing Measurements
Authors: Cheng Jun , Zhu Hong , Zhang Yu Ping , Zeng Yong
Published: April 2012

This paper investigate the problem of Robust H∞ ﬁltering for stochastic networked control system with nonlinearities and missing measurements. In this paper, missing measurements and nonlinearities are considered. The sufficient conditions for the existence of the ﬁlter are given, thus, guaranteeing the ﬁlter error system exponentially stable in the mean-square sense and the performance satisﬁes a prescribed level by employing the new Lyapunov-Krasovskii functional and linear matrix inequality technique, some new sufficient conditions are obtained.
Measurement and Application of Radiant Energy
Authors: Wang Lin , Wang Hong
Published: April 2012

Based on the application of radiant energy in various fields, the fundamental knowledge about incident radiation, including physical quantities and units, is summarized. Then, the category and principle of radiant energy detector are introduced, i.e. thermal detectors and photodetectors. Also, their application conditions are compared. It is significantly important for users to understand their operation principles and to choose an appropriate radiation measuring detector.
Signal Detection for Process with Unknown Distribution
Authors: Yang Su Fen , C. Arnold Barry
Published: April 2012

Control charts are effective tools for monitoring both manufacturing processes and service processes. Much service data comes from a process with variables having non-normal or unknown distributions. The commonly used Shewhart variable control charts which depend heavily on the normality assumption should not be applied here. Hence, an alternative is desired to handle these types of process data. In this paper, we propose a new Variance Chart based on a simple statistic to monitor process variance shifts. The sampling properties of the new monitoring statistic are explored. A numerical example of service times from a bank service system with a right skewed distribution is used to illustrate the proposed Variance Chart. A comparison with two existing charts is also performed. The Variance Chart showed better ability than those two charts in detecting shifts in the process variance.
Wireless Sensor Node Deployment Research
Authors: Peng Hai Shen
Published: April 2012

In view of static wireless sensor node deployment efficiency low and dynamic wireless sensor node deployment non-uniform question, proposed based on a sensation environment object minute bunch with the motion proxy node gathering data method, effectively solves wireless sensor node deployment energy management and data collection and so on crucial the technical difficult problems, thus enhances the wireless sensor network the application value
Failure Diagnosis of Hydraulic Motor in Amphibious Assault Vehicles Based on Support Vector Machine (SVM)
Authors: Yi Liang Hai , Dong Yu Cai , Qi Zi Wei , Wang Xiao Yan , Fan Ge Hua , Ma Rui Hong , Chen Ping
Published: April 2012

Hydraulic motor is one of the elements with a high occurrence rate of failure in hydraulic system of amphibious assault vehicles. When the motor leakage reaches the limit value allowed, the motor should be renewed or overhauled. Through an analysis of the influencing factors that affect hydraulic motor leakage of amphibious assault vehicles, this article establishes a support vector regression model for motor leakage and gets a maximum relative error of 4.29% between the fitted value and the measured value of motor leakage, which offers more reliable evidence for scientific determination of renewal period or overhaul period of hydraulic motor
Design of Electronic Control System of High-Grade Textile Machine Based on CAN Bus
Authors: Yu Hui Shan , Zhang Shou Hui , Ji Xiao Kua , Liu Xin Jian
Published: April 2012

According to some problems of Low efficiency of the current domestic Textile Machine，Reliability is bad，The operating personnel labor intensity，A single product varieties and so on. Design of electronic control system of high-grade textile machine based on CAN Bus. The system with RENESAS SH7047 chips as the controller chip, Realize the all of the interrupt signal, sensor signal detection, fuzzy PID algorithm and main shaft encoder location, Through the CAN bus transmission way to complete accuracy control ac servo system. The actual operation commissioning proves the electronic control system has the fast response, and robust, more kinds of textile and so on.
Research and Exploit on the Integrated System of Plastic Mold CAD/CAE
Authors: Lu Ya Ping , Wu Lie Qin , Chen Meng
Published: April 2012

An Integrated System of Plastic Mold CAD/CAE for key parts of large scale plastic mold is established, which consists of the three subsystems the CAD subsystems, the CAE subsystems and the materials query subsystem. The functions of the integrated system are realized based on Visual Studio platform, by using SQL Server Database, Pro/E, Pro/TOOLKIT and ANSYS Optimum Design. The integrated system provides seamless integration functionality through sharing and exchange of the same parameters between the CAD subsystem and the CAE subsystem. The parameters of the parts are saved in the SQL Server in the integrated system of plastic mold CAD/CAE. Firstly, the parameters values can be identified by CAD primary design in the CAD subsystem; secondly, The CAE subsystem reads these parameters and gains the material parameters from the materials query subsystem. Then, the remote optimization is conducted in the CAE subsystem; lastly, the CAD subsystem obtains final parameters values from the CAE subsystem, according to the results of remote optimization
Based on the Fractal Technology of Harmonic Detection Method in Power System
Authors: Li Yan Hong , Yu Tian Dong , Li Shu Liang
Published: April 2012

The harmonic pollution is one of the serious problems which impact on power system security and stability. With the development of power electronic technology, harmonic problems become increasingly prominent. Harmonic detection is an important content in the harmonic problems, is the base to solve the problem of harmonic. The harmonic of power system have characteristics of random and nonstationary, not easy to detect, in recent years, a variety of detection methods emerge in an endless stream, this paper introduces a technique of detecting harmonics in power system by using fractal method, this method by calculating the dynamic waveform grid fractal dimension, setting threshold value, and determines the waveform distortion occurring time. After the theoretical analysis and practical measurement, this method can be effectively used on harmonic detection and can meet the requirements in speed and accuracy.
Measuring Model of Dynamic Contact Force
Authors: Sun Zhong Guo , Li Xiang Dong , Wang Wei Dong
Published: April 2012

There are no systematic studies reported on measuring model of dynamic contact force between pantograph and overhead line. Keep this in view, the high-speed measuring model of dynamic contact force between pantograph and overhead line is discussed in details in this article. Based on the analysis of forces acting on the pantograph, measuring model of dynamic contact force is constructed with the mass correction and aerodynamic compensation. The results of verifying running test are given in the end of article to show that the measuring model is effective practically.
Optimization Strategy of Boiler Send-Guide-Air Automatic Control Scheme
Authors: Wu Ping Li , Liu Yu Bin
Published: April 2012

In this paper, we present an optimization control strategy for problems in conventional boilers send-guide-air automatic control system of power plant. We meet optimization of boiler send-guide-air automatic control scheme by means of improving air flow and oxygen content in flue gas measurement, revising control system structure, adopting fuzzy control algorithm, adding protection and other measures.
A New System of Failure Warning and Monitoring Control System for Gas Turbine Compressor (GTC)/Auxiliary Power Unit (APU) of Aircrafts and a Sample Study
Authors: Kushan Melih Cemal , Peng Zhong Xiao , Peng Shu Zhi
Published: April 2012

One of the key elements of servicing the aviation industry is the provision and maintenance of first class equipment. In order to ensure a secure and effective flight of aircrafts in aviation, the ground supporting equipment which enables the planes to get off the ground without delaying the flight plans, has to be kept ready at all times [1].
Application of Ground Penetrating Radar for Quality Detection of Tunnel Lining
Authors: Wang Fang , He Shao Hui , Liu Jun , Qi Fa Lin
Published: April 2012

The Golmud-Lhasa section of Qinghai-Tibet railway is located in the plateau and permafrost region which tunnel lining produces serious diseases in the extremely bad environment. This paper states the application of Ground Penetrating Radar (GPR) for quality detection of tunnel lining and how to choose parameters, sit detection lines, analyze GPR cross section and classify lining diseases in filed investigation. The results suggest that non-destructive testing technology of GPR can be used to detect the tunnel lining diseases mainly including second lining thickness, cavities and backfilling imperfection zones, and the technology is effectively to detect tunnel lining in abominable surroundings. Furthermore, detection results can provide scientific basis to evaluate the tunnel’s safety performance and diseases degree objectively
Robust Controller for Ship Dynamic Positioning Based on H∞
Authors: Wang Xiao Hua , Wang Xi Huai , Xiao Jian Mei
Published: April 2012

This document explains how to design a robust controller for the uncertain model of the ship dynamic positioning based on mixed sensitivity, which include environmental excitations. The computer simulation shows that it validated that the robust control system has a good performance.
Design of a Real-Time Device Monitoring Rubber Materials Compression Stress
Authors: Fu Li Jun , Zhang Wei Fang , Yang Ming Yuan , Ding Mei Li
Published: April 2012

Due to the complex operation of the compression stress relaxation test equipment used in the national standard, the measurement error is great and the uncertainty and instability of the test result is high, This paper proposes the design of a test equipment with the pressure transducer and digital indicator, which can do real-time monitor on the compression stress of rubber materials in accelerated ageing test. The stress range of the test equipment is 0～980 N, and temperature range 0～200°C. With this equipment, the compression stress in 70°C、80°C、90°C and 100°Cwas tested, and thus the curves of the compression stress at different temperature were obtained.
Research on Galvanized Layer Detection and Quality Control System of Tower Materials
Authors: Wang Hui , Jin Huan Xia , Fang Ji Tao
Published: April 2012

At present the coating thickness and uniformity of tower materials provided by the suppliers are tested through the visual method by the power department, the detection precision of this method is low and test results is not reflected objectively to superior departments. Galvanized layer detection and quality control system of tower materials are developed, through coating thickness and uniformity tested, test results are timely reflected to the competent department, the coating quality of the tower materials caused safety issues is effectively avoided.
Ultrasonic Inspection on Concrete Internal Defects of Complex Joints of Steel Reinforced Concrete (SRC) Structure Principle and Application
Authors: Liu Lin , Wang Qiang , Guo Kai , Xu Yan , Jia Shi Long
Published: April 2012

The quality criterion and engineering application of defects detection of complex joints of steel reinforced concrete (SRC) structure by ultrasonic method were described, and some problems requiring attention. Besides, how to more effectively apply ultrasonic inspection and other detection techniques by following “TECHNOLOGICAL SPECIFICATION FOR INSPECTION OF CONCRETE DEFECTS BY ULTRASONIC METHOD” [CECS 21:2000] is discussed. It is useful way to control and monitor the quality of Complex joints of steel reinforced concrete (SRC) structure.
Development of Hydroscopic and Fast-Dry Sportswear Fabrics
Authors: Liu Peng , Liu Yan Jun
Published: April 2012

Based on principles of the differential effect and the wicking effect, the coolmax fiber and the cotton fiber were selected as raw materials, and with these materials, a kind of special functional double-sided pique fabric was developed on the double-sided knitting machine. The designing principles of the fabric and the designing methods and technical parameters are mainly introduced in this paper, the machine selection and main matters that need pay more attention to during the producing of the fabric are also pointed out.
A Method of Recycling Waste Solution of Copper Plating Using Cyanidation in Laboratory
Authors: Shi Lei , Zhu De Sheng
Published: April 2012

The method of recycling waste solution of copper plating using cyanidation in laboratory involves the comprehensive utilization of waste solution in the electroplating field. The method includes the following steps: first, add activated carbon into the waste to remove the organic impurities, lower the temperature of the waste with cooling fin and form sediments to remove carbonate salt in it. Add sodium sulfide, alizarin into the waste, and the containing heavy metal element Pb2+, Zn2+ and Cr3+ in it precipitate through chemical reactions. Place the waste solution in the closed container and make cyanide hydrolyze to produce non-toxic sodium formate and ammonia by adding alkali and under heat and pressure conditions. It provides an easy and convenient method, which can effectively recover resources, and reduce pollution for recycling copper cyanide waste solution in laboratory.
Surface Integrity of Sintered NdFeB Permanent Magnet after EDM
Authors: Li Li , Niu Zong Wei , Yin Feng Shi , Liu Yuan Yong
Published: April 2012

In this study, the machining parameters of electrical discharge machining (EDM) are varied to study the effects of electrical discharge energy on material removal rate and surface roughness of NdFeB magnet. Moreover, the micro-cracks on the machined surface induced by EDM are also examined. The experimental results reveal that the MRR increases with the electrical discharge energy. The surface cracks on the machined surface are more serious when the discharge energy is higher. Thus, using EDM process to machine sintered NdFeB magnet depends on setting the machining parameters to prevent surface crack.
A Study on the Test of Rubber Crumb Modified Asphalt Mixture Road Performance
Authors: Wang Xiao Chu , Li Ying , Fu Lei , Wang Yi Peng
Published: April 2012

The article is based on the rubber crumb modified asphalt’s fundamental characteristics, paving a test road. Through test and compacted study of indoor pavement performance and technical index on-site, summarizing relevant experience, providing reference for similar engineering application
A Synthesized Process of Acidic Tin-Plating Waste Solution in Laboratory
Authors: Shi Lei , Zhu De Sheng
Published: April 2012

In the electroplating process of acidic tin-plating in laboratory, temperature is required to control at 5 °C or so, but conditions of the laboratory is limited, the average temperature is above 5 °C, which leads to Sn2+ in the bath hydrolyze, produce Sn(OH)2 impurities, and part of Sn2+ in the anode oxidize to produce metastannic acid. As time goes by, impurities increase gradually and eventually lead to the bath not be recycled. This paper mainly studied on impurities in the waste after electroplating were synthesized after a series of oxidation, filter and reduction, which makes recycled materials recycled to the greatest extent, non-recycling materials buried deep after high-temperature incineration. After the experiment, stannous oxide and distilled water in the waste get recycled, and the purity of stannous oxide gotten recycled is above 99.5%, which can be reused.
A Repeated Loading Triaxial Test Study on Resilient Modulus of Graded Crushed Stone
Authors: Wang Sui Yuan , Luo Zhi Gang
Published: April 2012

To investigate the effect of confining stress, deviation stress, moisture content and gradation type on resilient modulus of graded crushed stones, three types of graded crushed stone with three moisture content levels(optimum moisture content and ±2% of the optimum moisture content, respectively ) were used, and repeated loading triaxial (RLT) tests with twenty five stress levels were carried out. The RLT test results demonstrate that resilient modulus of graded crushed stone remarkably increases with decreasing moisture content and/or increasing confining stress; resilient modulus of graded crushed stone slowly increases, or minor decreases at the beginning and then slowly increases with increasing deviation stress at low stress state. Results also indicate that gradation type has a certain impact on resilient modulus of graded crushed stone.
Aloe Fiber and Pure Yarn Research on Performance
Authors: Meng Jia Guang , Feng Xiao Ting , Bai Juan
Published: April 2012

This article mainly introduced various properties of aloe fiber and yarn. Studies on properties of aloe fiber include the morphological structure, infrared spectrogram, fineness and single fiber strength. Studies on properties of aloe yarn include yarn strength, fineness uniformity, moisture content, yarn hairiness, and acid and alkali resistance.
Study on Platform Based on Windchill
Authors: Gao Li , Meng Xiao Jun
Published: April 2012

With a variety of computer-aided design software and different operating platforms being applied in the enterprise, integration between heterogeneous systems increasingly attracts widespread concern and attention. In this paper, two levels of integration, information integration and application integration, are studied on the basis of system integration. This paper constructs enterprise integration platform based on WindChill to realize integration of information and application. And an example about platform is given and analyzed.
Research on Water Cut of Silicon Steel Plate
Authors: Liu Geng Wu
Published: April 2012

Silicon steel plate is main material of motor and transformer , and was always used die for its production . Through water cutting test , the cutting speed of beeline and arc and water pressure was adjusted , the water cutting technology was mastered . The quality of production such as dimension , burr height was controlled well . The cut area was not rust because of using dry technology and the magnetic conductivity was not affected using water cutting . It will provides a speediness way for silicon steel plate production .
The Effects of Machined Workpiece Surface Integrity on the Fatigue Life of TC21 Titanium Alloy
Authors: Du Dong Xing , Liu Dao Xin , Sun Yu Feng , Tang Jin Gang , Zhang Xiao Hua
Published: April 2012

In this paper, the influence of different machining methods (including rough turning, finish turning, and longitudinal polishing after finish turning) on rotating bending fatigue properties of TC21 which belonged to a new ultra high strength titanium alloy was studied. The influence of machining methods on surface integrity of TC21 titanium alloy was measured by using surface profile measurement, scanning electron microscopy, metallography microscope, micro-hardness instrument and X-ray diffraction residual stress analyzer. And fatigue fractography of specimens was further investigated. Then the mechanism of fatigue resistance which was affected by machining surface integrity was discussed. The results indicated that the fatigue life of finish turning and longitudinal polishing after finish turning was increased 3.96 times and 17.34 times compared with rough turning, respectively. The machining surface integrity had important influence on fatigue property of TC21 titanium alloy, which caused by the differences of surface roughness and texture as the dominant factors, and then the variation in surface micro-hardness, metallographic microstructure and the surface residual stress were not the main factors on three above-mentioned machining methods. By using longitudinal polishing after finish turning processing method for preparation of TC21 titanium alloy parts could ensure good surface integrity and excellent fatigue performance.
The Chemical Compositions of the Lipid Extracted from Fermented Mycelium of Grifola frondosa
Authors: Wang Bao Qin , Xu Ze Ping , Yang Chuan Lun
Published: April 2012

The lipids from fermented mycelium of G. frondosa were extracted using supercritical flow CO2 and analyzed by GC-MS. There were 24 compounds detected in the lipids and the main compositions were octadecadienoic acid, eicosadienoic acid and hexadecanoic acid, with a little terpenoid compounds of cedrene, caryophyllene, isopropenylcarene, squalene, and some ergosterol. The total fatty acid content of the lipid was 89.18%, in which, the unsaturated fatty acid was 71.09%. The main compositions of saturated fatty acid were hexadecanoic acid and the main compositions of unsaturated fatty acid were linoleic acid and eicosadienoic acid (EDA). The contents of linoleic acid and EDA in the lipid from G. frondosa mycelium were 48.65% and 29.91% respectively.
Mechanism of Zinc Phosphating Solution at Low Temperature
Authors: Chen Ze Min , Lu Pin , Jia Yan
Published: April 2012

In our studied phosphating system, the morphology, chemical composition, phase and corrosion resistance of the phosphate film were characterized by EDS, AES, XRD and cathodic polarization curves. Test results indicated that the phosphate coating was made of the two kinds of Zn3(PO4)2•4H2O and Fe2Zn(PO4)2•4H2O crystals composed. On this basis, we came up the film-forming mechanism of low temperature phosphating technology.
The Study on Dynamic Simulation of the Roller Gear Indexing Cam
Authors: Liu Yan Song , He Wei
Published: April 2012

The roller gear indexing cam has irreplaceable superiority in the high-accuracy and high-speed indexing motion, but it can not keep the system’s good dynamic characteristics to improve machining accuracy of cam only. This paper studies the dynamic simulation of the roller gear indexing cam by means of virtual prototype technology, rigid multi-body dynamics, and contact mechanics, and the influences of this system’s parameters on dynamic responds of the mechanism. These works are valuable for designers, makers and users to optimal design, test, and make the mechanism, and give a new method for studying dynamics of roller gear indexing cam.
Effects of Rare Earth Addition on the Inclusions and Mechanical Properties of 2205 Duplex Stainless Steel
Authors: Liu Xiao , Wang Long Mei
Published: April 2012

The effects of rare earth metals on the inclusions and the mechanical properties of 2205 duplex stainless steel were studied by metallographic examination, scanning electron microscope (SEM) and energy spectrum analysis. The results show that the morphologies and sizes of non-metallic inclusions in 2205 duplex stainless steel are changed, and rare earth metals played a very good role of modifying inclusions. The fracture mode of 2205 duplex stainless steel is typical cleavage fracture, but quasi-cleavage and dimple fracture after adding RE into the steel, and the spherical inclusions of rare earth oxysulfide in the dimple are the main factors for this transformation. The transverse impact toughness of 2205 duplex stainless steel is improved obviously by RE. In comparison with 2205 duplex stainless steel without RE, the transverse impact toughness of 2205 duplex stainless steel with RE is increased 20.49% at -40°C, and the room temperature strength are improved, the elongation and reduction of area have been improved 11.67%, 24.55% respectively.