bluuebunny/crossref_metadata_2025 huggingface dataset:
Friction Torque Measurement of Servo Mount Based on Stribeck Model
Authors: Liu Wei , Li Yu Xia , Meng Hao Ran
Published: July 2013

In this paper, in order to realize mechanical behavior analysis and friction disturbance accurate compensation. A measurement system of friction with accelerometer is designed. Principle and method of friction measurement are analyzed, and the system is built. The torque ripple has a huge impact on friction measurement. The digital filter is designed for filtering error which is caused by toque ripple, and the virtual value of friction torque can be acquired. The parameter of friction torque can be obtained using nonlinear least squares method. The experiment is carried out on the servo mount. This measurement system and method can effectively and accurately measure friction torque of servo mount, and be used in measurement of friction torque on other mount.
Research on Fuzzy Pid Control System of Temperatuer for Tertiary Air
Authors: Zhang Jun Chao , Jing Shao Hong
Published: July 2013

The introduction of the AQC boiler has complex effects on the temperature of Tertiary air, traditional PID is difficult to achieve the effective control. Combined the method of the conventional PID with the fuzzy control theory, a fuzzy self-tuning PID controller is designed. Compared with traditional PID, results of simulation show that the fuzzy PID controller improves not only the adaptability and robustness of the system, but also the system's static and dynamic performance.
Design of Stepper Motor Control System Based on LM3S2110
Authors: Wang Yong Ming , Zhu Guo Quan , Qiu Xin Yin
Published: July 2013

To improve the reliability of control system and reduce the components, a stepper motor controller is designed. The excogitation also affords corresponding hardware implementation methods and software process. The control system is with LM3S2110 as its core. The stepper motor is driven by DRV8813 and the interfacing technique between CH452 keyboard and LED driver are given. It turned out that the system can simplify the design scheme in a economical and reliable way.
An Improved Software Synchronous Sampling Method in the Electrical Signal Parameters Measurement
Authors: Hyon Gyu O , Wang An Na , Wang Hao
Published: July 2013

Common software synchronous sampling methods have some shortcomings such as sampling synchronization error, sampling interval error accumulation increment and so on, and the impact of this error on the measurement accuracy can not be ignored [1]. In this paper, analysis on synchronization error occurrence reasons was performed, and proposed the synchronization implementation method of asynchronous sampling. This method can track the real-time changes of electrical signal by the zero-cross-over triggering circuit, and reduce the synchronization error by the software method. Simulation analysis of the signal cycle (frequency) and RMS measurement shows that proposed method improves accuracy of the electrical signal parameters measurement based on microprocessor technology.
Research on the Simulation Model for Lateral Control Channel of FCS Based on PC
Authors: Li Qing , Yang Wei , Zhou Jie , Ye Xiao Nan
Published: July 2013

According to the analysis of control structures of the two typical control modes-tilt control and course control, the simplified control rules for the two special control systems are presented. Under the condition of enduring the real-time property and fidelity, the classical control theory is applied to study the control parameters selecting of the flight control system (FCS) based on PC modeling traits. The selecting process of control parameters of lateral control channel is analyzed and the simulation resources are simplified. The simulation model is achieved. The steps are summarized for the simulation modeling of lateral control channel of the flight control system, and the corresponding flow chart based on PC is also given.
Design and Deployment of Hospital Digital Ward
Authors: Huang Zheng Dong , Song Li Li , Guo Xue Qing , Xiao Fei
Published: July 2013

s. In order to explore the building pattern of digital ward for medical affairs and management, the business process and function of digital ward is discussed. The digital ward building pattern combining multi business system, such as clinical treatment and nursing, logistic support like drugs and equipment, quality surveillance, performance checking, cost auditing and office administrating, is constructed. Based on the methodology of process management, the architecture of digital ward is design and implemented, which is focus on electronic medical records, medical quality and management. The construction of digital ward has implemented the overall process intelligent and automatic management of medical and administration business.
Modeling Constructional Parameters of a Solid Oxide Fuel Cell by Using an Artificial Neural Network
Authors: Milewski Jarosław , Świrski Konrad
Published: July 2013

An Artificial Neural Network (ANN) can predict an objects behavior with no algorithmic solution merely by utilizing available experimental data. The error backpropagation algorithm was used for an ANN training procedure. There are SOFC features mainly architectural in nature that cannot be expressed in numerical form or where numerical expression is difficult to obtain, i.e. electrolyte type, anode type, cathode type etc. In those situations a hybrid model (H-ANN) which contains the ANN model and mathematical expressions can be applied. The H-ANN is able to predict cell voltage with knowledge of minimum physical factors.
An Experimental Investigation on Polypyrrole Films Electro-Polymerized under a High Transverse Electric Field
Authors: Preethichandra D.M.G.
Published: July 2013

Polypyrrole films were electrodeposited under different high transverse electric fields, and their film morphologies and functionalities were investigated. The surface morphology at the initial polymerization stage was investigated under AFM and the cross sectional morphologies of fully grown films were investigated by SEM. Both these microscopic investigations revealed the film morphology has been influenced by the applied transverse field. The cyclic voltammetry tests illustrate a reduction in the anodic peak voltage with the increase of transverse field. All these results suggest that the polymer electro-polymerized under a transverse high transverse electric field has some degree of pre-orientation compared to the films synthesized without a transverse electric field.
A Design of System for Regional Electromagnetic Monitoring and Signal Identification Based on Virtual Instrument
Authors: Li Shi Jing , Wang Yu Wen
Published: July 2013

At present, quantities of similar spurious signals have been found in the reconnaissance and there are electromagnetic leakage problems when each department of work does scientific experiment using varieties of signals that put forward new challenges to national defense and scientific research information security. Aiming at these situations, a new type of the regional environmental electromagnetic monitoring and signal identity system emerges to meet the practical need of electromagnetic environmental monitoring. This system monitors signals over small areas by using newest mixed domain signal analysis method and combining with virtual instrument, which let the desired research goal more convenient to be realized. The system with the characteristic of accuracy, usability, portability and expansibility can do efficiently electromagnetic environmental monitoring job and are practical and worthy of using abroad.
Radar ECCM Performance Assessment Model
Authors: Cao Fei , Wu Fan , Li Jing
Published: July 2013

The performance of radar anti-jamming (ECCM) to become an important parameter in modern radar, how objective and comprehensive assessment of the performance of radar equipment development and use are of concern, this paper analyzes the radar-jamming environment, build a radar evaluation index systemestablished anti-interference assessment models, the results of the assessment, and finally a brief analysis of the results.
The Cross-Eye Jamming Mathematical Modeling
Authors: Cao Fei , Liu Qing Yun , Wu Fan
Published: July 2013

A rigorous mathematical analysis of cross-eye jamming in a radar system scenario and an expression for the induced angular error due to the cross-eye jammer are presented. The simulation results show that there is a Doppler difference between jamming and target return. The Doppler difference increases with the decrease of the distance between the monopulse radar and the platform protected by cross-eye jammer. When the power of target return is not small enough with respect to the power of jamming transmitted by one of the two sources, maybe the sign of the indicated angle is uncontrollable. The simulation results also show that although the cross-eye gain is maximized if two jamming signals are equal amplitude and antiphase, it is not a reasonable choice.
Processing the Double Channel MGG Signal Based on Independent Component Analysis
Authors: Miao Lei , Xu Bao Lei , Qin Shu Jia , Lee Min Ho
Published: July 2013

Giant Magnetoimpedance (GMI) sensor is the hot research topics in sensor engineering. In this paper we setup a double channel acquisition system for MGG signal. Then FastICA algorithm is applied in the raw data and We get the spectrum after ICA processing. The results show that ICA is powerful tool for MGG signal processing to separate the noise signal.
Active Control Technology of Engine during the Upshifting
Authors: Sun Yong Gang , Liu Bo Lan , Deng Chang Zhen
Published: July 2013

In this study, a light tracked vehicle powertrain plant as a research platform, do simulation and experimental studies for upshift dynamic process of the tracked vehicle, study the effect that using active control strategy for the integration of the tracked vehicle impact on ride comfort and acceleration. The results show that in the upshifting process, active reduction of engine oil control can improve vehicle ride comfort, but the increase by reducing fuel consumption and reduce the reducing time will lead to increase shift smoothness and increase upshift power loss.
Numerical Prediction Method of Resistance Performance of Catamaran Planing Vessels
Authors: Shen Hai Long , Lu Wei , Su Yu Min
Published: July 2013

The classical approaches using CFD software to calculate the hydrodynamic performance of catamaran planing vessel still need to rely on the model test or empirical formula to make sure of the running attitude. So a theoretical calculate method of resistance performance of catamaran planing vessel is proposed in this paper based on RANS equations and the VOF method to couple six degrees of freedom equation of the catamaran planing vessel. Numerical simulation results indicate that using RANS equations can better forecast hydrodynamic performance of catamaran planing vessel at high speed, which provides a practicable numerical method for optimization design of the catamaran planing vessels hull.
An Improvement Measure to AC-BM Pattern Matching Algorithm in Intrusion Defense System
Authors: Xiang Qing Quan , Lv Zhe , Qiao Pei Li
Published: July 2013

Pattern matching algorithm is a key technology of intrusion defense system in computer network. Based on the pattern matching algorithm AC-BM, This paper proposes an structure of binary tree to express the pattern tree , the structure model of binary tree can reduce the time of forming pattern tree, and then through the using of improved BMHS algorithm of bad character, the algorithm can increase moving distance of pattern tree decrease the matching time, and promote the speed of pattern matching. The experimental data show that, through the improvement of AC-BM algorithm, it indeed can improve the matching speed, achieving good time performance.
Wear-Life Models for Angular Contact Spherical Plain Bearing under Different Load Types
Authors: Zhang Xiang Po , Shang Jian Zhong , Chen Xun , Zhang Chun Hua , Wang Ya Shun
Published: July 2013

To meet the demand of wear-life calculation of spherical plain bearing (SPB), the wear-life models for angular contact spherical plain bearing (ACSPB) under different types of load were created based on the joint wear calculation method (JWCM). By integrating the friction wear laws of materials, specific configuration & mating characteristics of the SPB, and function requirement, the new models were more theoretical and had a good applicability and pertinence compared to the empirical models used at present.
Aeroelastic Modeling and Analysis of a Horizontal Axis Wind Turbine
Authors: Zhang Xin Tan , Wu Zhi Gang , Yang Chao
Published: July 2013

Dynamics of the horizontal axis wind turbine is investigated in this paper. The wind turbine rotor modelling is based on the nonlinear Eular beam model, the generalized dynamic wake model and the Beddoes-Leishman dynamic stall model are used to predict the aerodynamic loads. The Newton-Rafson iteration is adopted to get the solution in each time step and the second-order backward difference is used in time marching. A horizontal axis wind turbine is analysed in fixed rotor speed and the structural responses in rated conditions and critical wind conditions are obtained. The critical wind velocity is acquired from simulation. The influences of the rotor speed and yaw angle on the critical wind velocity of the rotor are reserched.
Prediction of Crack Initiation of Rail Rolling Contact Fatigue
Authors: Deng Tie Song , Zhao Xin , Wu Bing , Li Wei , Wen Ze Feng , Jin Xue Song
Published: July 2013

A plain-strain finite element (FE) model of the rail is developed by ABAQUS. The 1070 rail steel is considered in the model by Jiang and Sehitoglu's cyclic plastic constitutive equation. The wheel-rail rolling contact is represented by a moving load applied on the contact surface. Based on the FE results the initiation of rolling contact fatigue (RCF) crack is further evaluated by Jiang's fatigue model. Effects of the rail material inner defect and the friction coefficient are also investigated. The results show that the stress-strain state of the rail surface material becomes stable after about thirty passages. The maximum residual stress and strain are located in the subsurface. The life of a defected rail can be as low as 1/27~1/17 of a qualified rail, and the most probable location for crack initiation is highly dependent on the inner defect. The fatigue life is found to considerably decrease with the friction coefficient, while the location of crack initiation and its direction of propagation are less affected.
Out-of-Plane Mechanical Property Test on Titanium Honeycomb Cores
Authors: Xie Zong Hong , Liu Xiao Yu , Yue Xi Shan , Yan Qun , Sun Jun Feng , Jing Yong Juan
Published: July 2013

As a typical cellular solid, the honeycomb core shows an orthotropic behavior in its mechanical properties. Engineering analysis often adopts a homogeneity assumption that honeycomb core is equivalent to an anisotropic continuum. Currently available cellular solid model cannot predict the physical properties of titanium honeycomb core with acceptable accuracy. Therefore, mechanical test must be carried out to obtain the mechanical properties of metallic honeycomb structures. This paper introduces the work on flatwise compression test and out-of-plane shear test on titanium honeycomb core structures in accordance to ASTM C 365-03and ASTM C 273-00. The out-of-plane stiffness and strength for titanium honeycomb cores with incircle diameter of 4.8mm and wall thickness of 0.05mm were obtained.
Effects of Impressed-Current on Sensitivity of Adiabatic Shear of TC6 Titanium Alloy
Authors: Sun Kun , Yue Kai Hua , Xu Yuan , Xiang Wen Li , Zhong Wei
Published: July 2013

Dynamic compression test on TC6 titanium alloy samples have been done by using a split Hopkinson bar process and extra circuit under conditions of room temperature and high strain-rate. The effect of impressed-current on sensitivity of adiabatic shear of TC6 titanium alloy has been studied. It is shown that the impressed-current can reduce the sensitivity of adiabatic shear of TC6 titanium alloy under the condition of high strain-rate. Free electron in the samples will do direct move and take heat away from high localized area to decrease the effect of the heat. The result will help to delay formation of the adiabatic shear band. So, that is reducing the sensitivity of adiabatic shear of TC6 titanium alloy.
Pressure-Velocity Model for In-Pipe MFL Detector in Gas Pipeline
Authors: Quan Kai , Zhao Yang , Liu Si Liang , Gao Song Wei
Published: July 2013

The accuracy of the data detection can be affected by speed of in-pipeline MFL detector during non-destructive testing of gas pipeline. So speed regulation of in-pipeline MFL detector is researched in this paper. Speed regulation of in-pipeline MFL detector can be seen as change of speed under different steady state. In-pipeline MFL detector and up-down stream gas are regarded as a particle. According to principles of fluid mechanics, the relationship of pressure of pipeline and speed of in-pipeline detector is analyzed and pressure-speed model of in-pipeline detector is built. The speed of in-pipeline detector is calculated under different steady state based on pressure-speed model for the purpose of speed adjustment. The results of simulation in the Second West-East natural gas pipeline show that the speed of in-pipeline detector can be accurately calculated and effectively adjusted.
Quantification of Sulphate in Ambient Aerosols by FTIR Spectroscopy
Authors: Wei Xiu Li , Gao Min Guang , Liu Jian Guo , Xu Liang
Published: July 2013

Aerosols are important species in the Earths atmosphere and influence both air quality and climate in many important. In this article the relationship between IR absorption bands and SO42- was discussed. Theν3 band of SO42- in FTIR Spectra was studied when used as Na2SO4 . The results indicated that the peak positions of SO42- were 984 cm-1 and 1133cm-1. And the relation between these peaks aera and the quality of SO42- was well linear. And we give the value of α in band of 900-1300 cm-1. we measured all of the samples on the Ge and not a point, so the quantitive was not been affected by the nonuniform sample on Ge.
Sliding Mode Observer and Controller Design for Nonlinear Supersonic Missile
Authors: Zhao Hong Chao , Shi Xian Jun , Wang Ting
Published: July 2013

The nonlinear equations of motion were constructed for a supersonic anti-warship missile. In order to estimate the unknown angle-of-attack, a sliding mode observer was designed. The convergence capability of the sliding mode observer was analyzed according to the Lyapunov stability theory. A sliding mode controller was designed to drive the missile normal overload output to track its command, based on the output-redefinition approach. In order to confirm the performance of the designed sliding mode observer and controller, a simulation example was carried out for nonlinear missile model. The simulation results show the fast convergence capability of the designed sliding mode observer and controller.
Analysis and Evaluation of One-Way Time Service by Beidou Dual-Frequency Multichannel Receiver
Authors: Yang Fan , Yuan Hai Bo , Dong Shao Wu
Published: July 2013

High precision time plays a key role in technology and economy domain. as the time transmitting carrier, time service restricts timing precision of users. Combined with the characteristics of Beidou navigation system, the paper describes the one-way time service theory, accomplishes Beidou one-way timing algorithm and the software design. Finally, using the satellite data of Beidou dual-frequency multichannel receiver at the National Time Service Center (NTSC), the Chinese Academy of Sciences, the precision of Beidou one-way time service by the different types of satellites-GEO satellites, IGSO satellites, GEO combined with IGSO satellites-is analyzed and evaluated. The experiment result will provide important reference for optimizing the function of Beidou one-way time service.
Stability Simulation Research of Tractor-Semitrailer Braking in a Turn
Authors: Li Chen , Li Xing Hu , Zhou Wei , Zhang Hong Wei
Published: July 2013

A dynamic model of tractor-semitrailer braking in a turn was established in this paper. By comparing the data of tractor-semitrailer test, a high credibility of the simulation model was certified. In this paper, yaw rate gain and folding angle gain were introduced to evaluate the stability of tractor-semitrailer braking in a turn, and the role played by ABS was analyzed. The results show that yaw rate gain and folding angle gain are very comprehensive evaluating indicator, and ABS plays an important role in improving the stability during braking in a turn of tractor-semitrailer.
Automatically Recording of Machining Tasks and Status
Authors: Lin Zu Wen , Yao Bin , Peng Ming Jun , Zhuo Yong , Zhang Dong Sheng , Zhou Bin
Published: July 2013

Record machining tasks and machine status automatically based on one development kit for CNC system. A custom control is developed based on COM component technology to view recorded machining tasks and machine status on the CNC screen real-time. The function of data acquisition implemented by this article, can not only provide the basic data for the MES system, but also facilitate the operators to view the machining tasks and machine status.
Design and Application of Vibration Signal Acquisition System Based on ATmega128 MCU
Authors: Wang Zu Min , Luo Xian Cheng , Sun Hui Lin
Published: July 2013

This paper introduces one method to design a vibration diagnosis device from several sides such as components choosing, circuit designing and soft programming. This device consists of ATmega128 MCU, acceleration transducer, TLC2543 and other peripheral components and it can conveniently acquire and analysis signal. The resource used to test the device was supported by Function Generator and amplified by Power Amplifier. The data was exported to PC and graphed by MatLAB application, and then made a comparison with the theoretical graph to prove the method validity. This design has simple circuit and small codes, but it can capture mechanical working state accurately, so it has preferably practical value and economic benefit.
Optimal Analysis Window Size Investigation in Accord with Number of Edge Direction
Authors: Jeon Gwang Gil
Published: July 2013

The display monitors have been developed rapidly. The traditional broadcasting systems employed interlaced scanning format to hide motion artifacts. The procedure of converting interlaced video into a progressive formatted video called frame rate conversion. However, due to the variety of progressive scanning formats, all interlaced scanned contents must be transformed progressive format. In this paper, we study optimal number of window size for frame format conversion method. The objective and subjective performance are shown in performance analysis section.
Gas Control Technology of Fully Mechanized Caving Face of Hard Desorbing Coal Seam
Authors: Wang Gang , Wang Hai Yang , Zhang Xin Hua
Published: July 2013

Basing on the problems of residual coal in goaf in fully mechanized caving face in hard desorbing coal seam, high content of residual gas, large gas emission, serious gas overrun in return airflow corner and vitiated air, combing the actual situation in 3-219 fully mechanized caving face, the paper has adopted adjacent goaf drainage, drainage in gas drainage technology, formed a low investment cost and effective gas control technology and ensured the safe and efficient production in coal face and has a certain reference to control gas of fully mechanized caving face in hard desorbing coal seam.
A Method of Speed Control during Over-Ground Walking: Using a Digital Light-Emitting Diode Light Strip
Authors: Huang Liang , Zhuang Jie , Zhang Yan Xin
Published: July 2013

The purpose of this report was to introduce the design of a portable, inexpensive and programmable digital light-emitting diode (LED) system to control overground walking speed. The system includes a custom-made 10 meters digital LED strip and a digital microcontroller. By controlling the duration time of the power supply to each LED unit, a visible running lights signal can provide a visual cue for speed control. To evaluate this design, five subjects were asked to walk overground while following the LED visual cue at five different target speeds. The actual walking speeds were determined using Vicon motion capture system. The results of this evaluation showed a good match between the actual and desired speeds. The average percent difference was 2.51%, measured over 250 walking trials by the subjects. 98% of trials had an percent difference smaller than 6.5%, which is the maximum tolerated error within the literature. The inter-trial reliability for the LED speed control system ranged from 0.85 to 0.88 for faster speeds (1.6 m/s, 1.4 m/s), and slightly lower ranging from 0.74 to 0.79 at slower speeds (1.2 m/s, 1.0 m/s, 0.8 m/s).
Accuracy Enhancement of CNC Multi-Axis Machine Tools through an On-Line Error Identification and Compensation Strategy
Authors: Ouafi Abderrazak El , Barka Noureddine
Published: July 2013

In order to improve multi-axis machine accuracy, error compensation techniques have been widely applied. However, the lack of reliable methods for direct, global and comprehensive estimation implies that all compensation techniques are based on off-line sequential error components measurement. These measurements provide static results, and cannot reflect the actual machine conditions. Thus, these results are not representative of the real working conditions because of disturbances from thermal distortions and dynamic perturbations. This paper presents an on-line error identification and compensation approach for CNC multi-axis machine tools. Based on the simultaneous measurement of error components, the proposed identification scheme is built to ensure volumetric error prediction for an adaptive error compensation system. Implemented on a moving bridge type CMM, the approach led to a significant improvement of the three-dimensional measurement accuracy.Compared to the conventional off-line error compensation techniques, the proposed identification and compensation approach can further improve the compensation adaptability and efficiency.
Research on Fuel Economy of Hybrid Electric Vehicles
Authors: Li Teng Teng , Qin Kong Jian , Gao Jun Hua , Wang Feng Bin
Published: July 2013

On the road, fuel meter and electric power meter were employed to measure fuel consumption and electricity consumption of two parallel hybrid electric vehicles (PHEVs); Corrected methods recommended by SAE J2711 and GB/T 19754 respectively were used to modify fuel consumption of two vehicles through electricity consumption; According to the result, how total quality and Air-Condition (AC) load affect fuel economy were analyzed. Test results showed that, When K was less than 1%, relative error from calculation results of fuel consumption per 100 km obtained by above two methods was within 0.7%; Compared with AC off condition, fuel consumption per 100 km of PHEVs under AC on condition increased by more than 42%, which caused bad fuel economy, the effect of fuel-saving was decreased by 10% or more accordingly.
Research on the Friction and Wear Test between Dental Prosthetic Materials and Natural Teeth
Authors: Liu Hong Jie , Zheng Kan , Xiao Xing Zhi
Published: July 2013

To study the effects of different oral environment factors on the friction and wear properties between dental prosthetic materials and natural teeth, several comparing experiments were implemented by using a reciprocating friction and wear test machine containing an artificial saliva solution. Three kinds of factors including load, frequency and cycles were investigated on titanium alloy TC4 and zirconia ceramic. The experimental results showed that zirconia ceramic has a better wear resistance and a lower friction. The wear loss of titanium alloy TC4 was 10 times of that of zirconia ceramic under same conditions. A significant positive correlation between three factors and wear loss was also discovered.
Vehicle Rollover Warning System Based on MEMS
Authors: Ge Ru Hai , Guan Jun , Shi Cun Jie
Published: July 2013

An ARM11-based vehicle rollover warning system is designed in this paper in order to prevent vehicle rollover occurred while driving. Monitor the vehicle real-time roll angular velocity and roll angle via sensors and Multi-level Recursive Model is used to predict the vehicle roll attitude. When the predicted roll reach to the limit conditions then trigger the alarm to remind driver to be careful and to take appropriate measures, so as to prevent vehicle rollover accidents. Vehicle rollover warning system software is designed based on VB 2005, Matlab and NI Measurement Studio, results between simulation and real vehicle test show that vehicle rollover warning system can predict vehicle rollover timely and accurately, which can improve vehicle active safety.
Experimental Studies of the Endwall Flow in a Multistage Low-Speed Axial Compressor
Authors: Zhang Chen Kai , Hu Jun , Wang Zhi Qiang , Yu Shi Qi
Published: July 2013

Detailed flowfield measurements are made in the end-wall region of a four-stage low-speed large-scare axial compressor test rig. Two ten-hole survey boundary layer probes, one four-hole pneumatic probe, and six dynamic pressure probes each bedded with a high-frequence response Kulite sensor, are designed and manufactured to aid the test. Boundary layer region and mainflow region can be clearly distinguished from the boundary layer measurement results. A few parameters, including boundary layer thickness, displace thickness, momentum loss thickness, energy loss thickness and blockage coefficient are calculated based on the measurements. Results from turbulent boundary layer empirical formula of plate are in good agreement with the mesurements, indicating a way of boundary layer effect estimation. The evolution trajectory of TCV is identified evidently by dynamic pressure measurements. The maximum aerodynamic load point on the blade moves from the trailing to the leading edge as flowrate decreases, which leads to the forward movement of the tip clearance vortex inception point.
Effects of Different Surface Structures on Vibration of Friction Coefficient between Cylinder Liner and Piston Ring
Authors: Qu Sheng Guan , Hu Yong , Li Bin , Wang Guang Hong , Li Xiao Qiang
Published: July 2013

nfluential degree of different surface structures on stable output power of diesel engines under continuing work condition was evaluated, and relatively comprehensive reference optimizing micro-geometric morphology structure on cylinder liner surface was provided, through performing friction and wear experiments of cylinder liner and piston ring with three kinds of different surface structures: honing textured surface, no textured surface, and crater-grooved surface on an Optimal SRV IV oscillating friction and wear tester respectively, and analyzing effects of different surface structures on vibration of friction coefficient with power spectrum density. Results show that crater-grooved surface structure has smaller vibration value of friction coefficient under low loads and fluid lubrication state, while roughness determines vibration of friction coefficient under high loads and boundary lubrication state.
CFD Analysis of Clutch and Improvement
Authors: Zhu Mao Tao , Lu Feng , Liu Xue Lai , Chen Jing
Published: July 2013

Establish the simplified model of 215 clutch. Then made grid division and apply the boundary conditions to the model to do CFD analysis in ANSYS CFX module. According to the results, a new pressure plates structure is suggested. The gap between the supporting platforms against the diaphragm spring is designed into bevel and the number of the supporting platform is increased from 6 to 9. The result of the new structure shows that the air flows quickly than the original one. In other words, the convection between the air and the pressure plate is improved, and it contributes to reduce the temperature rise.
Design and Analysis of One Kind of Preliminary Storage Centrifugal Action Mechanism Applied to Submunition Fuze
Authors: Xu Sheng Gang , Wu Yan Xuan , Fan Ning Jun , Cheng Dong Qing , Qin Dong Ze
Published: July 2013

According to the requirement of the U.N. for the rate and function of dud, this paper proposes a project to improve mechanical structure of original submunition combing with the development status of submunition in China. With the characteristics of submunition fuzes structure and working environment, one kind of preliminary storage centrifugal action mechanism is designed in the paper. The principle and process of action are also elaborated. The paper makes calculation of reliability and does dynamic simulation by stages according to working process of submunition. Calculation and simulation results demonstrate that preliminary storage centrifugal action mechanism can be reliable and achieves the aim of design.
Measurement Investigation of Complex Eddy Viscosity Model in Non-Equilibrium Wavy Wall Turbulence with TRPIV
Authors: Zhang An Tong , Jiang Nan
Published: July 2013

The spatial flow fields of turbulent boundary layer over a wavy wall were measured by TRPIV at three different Reynolds numbers in a water channel, the mean streamwise and wall-normal velocities near the wall were calculated from the time series of instantaneous spatial 2D-2C flow fields of turbulent boundary layer, and the periodic distributions of the streamwise and wall-normal velocity in streamwise direction influenced by the wavy wall were found. The spatial distributions of Reynolds stress and mean velocity strain rate were obtained by ensemble average. Using the spatial cross-correlation technique, the spatial phase relationship in streamwise direction between mean velocity strain rate and Reynolds stress was investigated. It is found that there exist spatial phase differences between Reynolds stress components and mean velocity strain rate components, the phase differences increase gradually after decrease gradually from zero away from the wavy wall in wall-normal direction and reach a minimum at 0.4~0.5 times the wavelength of wavy wall, and in a certain range the effect of the Reynolds number on the phase differences is very small. The reasonability of the complex eddy viscosity model is confirmed by these experimental evidences in order to forecast non-equilibrium turbulence accurately.
Optimal Vacuum Calculation and Analysis of Composite-Cycle Air-Cooling System
Authors: Wang Sheng Long , Li Wen Hao , Ge Yin Hai
Published: July 2013

In this paper, the research object is composite-cycle air-cooling system. First,gave a brief introduction of the system structure and the working principle in power plant. Then the optimal vacuum calculation model was established with the analysis of performance indicators and the amount of equipment production, consumption power of system. Analyze the impact of the ambient temperature to system optimal vacuum in variable conditions. Lastly, combining the climatic conditions of example, which can be drawn is that when the annual best vacuum is 4.8kPa, the running annual earnings is the highest. This article provides guiding significance for correct understanding and engineering applications of composite-cycle air-cooling systems, also further confirm the feasibility of composite-cycle air-cooling system.
Sliding Mode Control of Brushless DC Motor with Feed-Forward Exponential Reaching Law
Authors: Huang Zeng Fu , Xiao Jian Mei , Wang Xi Huai
Published: July 2013

This paper presents the speed control of brushless dc motor drive employing sliding mode control. In order to improve the dynamic performance of the speed control of a Brushless DC Motor (BLDCM), a strategy of sliding mode control with Feed-forward Exponential Reaching Law, compared with the traditional PID control under Motor mathematical model given, the control performance was improved greatly. The simulation results showed that the control strategy has good performance with fast response, no over-shoot, and improved the robustness of Brushless DC Motor.
Piezoelectric Actuators Used for Helicopter Vibration Reduction
Authors: Zhang Zhu , Yang Wei Dong , Yang Da Lin
Published: July 2013

This paper covers the development of two piezoelectric actuators for trailing edge flap control on mach scaled model helicopter rotors. The design, analysis and bench tests of these two actuators are described. Under different voltages and frequencies, their drive performances are tested and compared. Results showed that these two actuators all can effectively drive and control the flaps with each advantages and disadvantages.
Temperature Researches of Porcelain Insulator
Authors: Zhao Cheng Jun , Li Chuan , Zhang Xu , Zhao Zhen Gang , Li Ying Na , Xie Tao
Published: July 2013

When porcelain insulator operates in a harsh environment for a long time, it will cause leakage current increase, and lead to heating phenomenon. As a result, the temperature of porcelain insulator can be changed, which probably due to crack, breakdown or other factors. In order to reflect the working state of the porcelain insulator, to monitor the temperature of porcelain insulator, optical fiber Bragg grating temperature sensors are installed respectively on the steel cap and the porcelain of porcelain insulator. In the interaction of industrial frequency voltage test of 15kV, thus the temperature of porcelain insulator can be distributed. The temperature of the porcelain insulator affects the center wavelength of optical fiber Bragg grating temperature sensors, which are installed on porcelain insulator. The tests show that in the pure condition, the temperature of porcelain insulator's steel cap and porcelain respectively rise 1.4°C and 1.5°C, in the polluted condition, the temperature of porcelain insulator's steel cap and porcelain respectively rise 5.8°C and 6.3°C, in the pollution level II condition, the temperature of Porcelain insulator's steel cap and porcelain respectively rise 6.8°C and 7.2°C. Therefore, by using optical fiber Bragg grating temperature sensors to monitor the change of porcelain insulator's temperature, combined with the researches of temperature characteristics, can directly reflect the porcelain insulator's working situation and real-time online monitoring.
A Composite Scales Heavy Anti-Corrosion Coatings Use in the Marine Structural Facilities
Authors: Su Man Rong , Huang Fu Chuan , Tang Xing Zhong , Lan Min Xing , Xiao You Cheng , Liang Hui , Li Sheng
Published: July 2013

In this paper, through the study of the marine conditions of structural facilities applications, in order to reduce the corrosion of marine structural facilities, Asked the neural network algorithm combined genetic algorithm to determine the components of the coating to the development of composite scales heavy anti-corrosion coatings, it has interpenetrating polymer network structure (IPN). Experimental results show that the composite scales heavy anti-paint adhesion, excellent corrosion protection, easy to use marine engineering, field operating conditions used, and its sources of raw materials widely,modulation process is simple, easy to mass production and application, can be reduced to some extent marine the cost of structural facilities for anti-corrosion.
Artificial Blasting Vibration Response Test and Analysis Based on Cottage Construction of Brick Structure
Authors: Jia Jing Min
Published: July 2013

The old oilfield in eastern China has conducted several rounds of seismic exploration. Artificial blasting inevitably layout into town and city building dense area. Quaternary alluvial plains in loose sand, the local large brick structure housing affordability study with artificial explosives directly related to the optimization of blasting parameters. On the basis of a large number of focal blasting venue, housing vibration test data, combined with the near-surface structure and brick structure housing construction characteristics. It focused on analysis different explosive source caused by blasting parameters venues and housing vibration displacement, velocity, acceleration amplitude, frequency characteristic parameters, duration, and vibration direction, summed up the venues and housing vibration response, attenuation relationship, housing construction vibration characteristics and seismic performance. The results show that, depth change of the blasting based on the ground, housing peak attenuation impact, not changes in dose. Vibration velocity, acceleration, displacement exists obvious amplification effect at 130m and 230m.
Analysis of Three-Dimensional Numerical Simulationin on Overlying Strata’s Stress Field and Displacement Field in Thick Seam Mining
Authors: Xu Meng Lin , Zhao De Shen
Published: July 2013

It takes the typical coal of mining in S2S9 face of Daping mine, using the 3-D numerical simulation to reveal on its face with the vertical characteristics of the stress field and displacement field .The study showed that the overburden strata migration features during the mining process in in thick seam mining of Daping mine.This research can be a reference for safety and high efficient coal mining of other parts of the soft overburden in extra- thick seam mining technology.
Growth of Highly C-Axis Oriented AlN Films at Water Cooling Condition
Authors: Yang J. , Jiao X.Q. , Zhang R. , Zhong H. , Shi Y. , Du B.
Published: July 2013

In this work, the aluminum nitride (AlN) thin film with highly c-axis orientation was prepared successfully at water cooling condition by RF sputtering. The influence of water cooling on the crystalline quality of AlN thin film is researched. The crystalline characteristics and microstructure of AlN thin films deposited on Si (111) and Mo/Si (111) were researched by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). The results indicated that highly c-axis AlN films can be synthetized at water cooling condition. The AlN film deposited on Mo thin film is titled to the surface, when that is perpendicular to the silicon substrate. Different models are proposed to explain the growth behaviors of AlN thin films on the two kinds of substrates.
An Anti- Occlusion Tracking Algorithm Based on MCD Correlation Matching
Authors: Liu Pu , Wang Chun Ping , Fu Qiang
Published: July 2013

In order to improve the stability of target tracking under occlusion conditions，on the basis of researching some target tracking algorithms, this paper presents an algorithm based on MCD correlation matching, which combines multi sub-templates matching and target movement prediction. Besides, for occlusion characteristics, corresponding template matching criterions and updating methods are put forward. Experimental results show that, comparing with the single template method which updating frame by frame, the proposed algorithm has a certain anti-occlusion ability with better stability and continuity of target tracking under occlusion conditions.
Some Implementation of MATITK on Medical Image Processing
Authors: Wang Yu Wen
Published: July 2013

Medical image processing includes many basic components such as medical image filtering, medical image segmentation and medical image registration, whose advanced algorithms can be found in ITK platform. But the ITK is difficult for the beginners. Only simple function is used to call dozens of image processing algorithms by MATITK . Therefore by using MATITK , the students can master these advanced algorithms and the improved implementation results can be obtained.
A Novel Face Recognition Algorithm
Authors: Zhaxi Cai Rang , Li Yue Guang
Published: July 2013

This paper firstly analyzes the principle of face recognition algorithm, studies feature selection and distance criterion problem, puts forward the defects of PCA face recognition algorithm and LDA face recognition algorithm. According to the deficiencies and shortcomings of PCA face recognition algorithm and LDA face recognition algorithm, this paper proposes a solution -- PCA+LDA. The method uses the PCA method to reduce the dimensionality of feature space, it uses Fisher linear discriminant analysis method to classification, the realization of face recognition. Experiments show that, this method can not only improve the feature extraction speed, but also the recognition rate is better than single PCA method and LDA method.
The Extraction Research of Urban Road Information Based on the High Resolution QuickBird Image
Authors: Wu Wen Huan , Zhao Ying Jun , Lu Dong Hua , Zhang Dong Hui
Published: July 2013

This paper studied the key technology of the extraction of urban road information using high-resolution QuickBird image. And this paper discussed the road information extraction algorithms, K-mean image clustering and segmentation algorithm, lambda-schedule image merging algorithm and the construction of knowledge database using spectral and shape features, from three angles, image segmentation algorithm, image merging algorithm and specific road information extraction algorithm. Studies showed that, after the introduction of the spectral and texture information, road extraction method reached a higher area and shape consistency, and provide a valuable reference for related research in the field.
Research of Measuring High Visibility at Night Based on Dual Light Sources Digital Image
Authors: Dai Pang Da , Zhang Yu Jun , Lu Chang Hua
Published: July 2013

Research on measuring night visibility using digital images mainly focused on low visibility conditions nowadays. Also, the long term observation leads to fluctuations of the single light source, which would undermine the measuring range and precision. In this context, this paper presents the dual light sources measurement method to eliminate the fluctuations of single source and to achieve both high measuring range and precision at night conditions. The source of visibility measuring error is firstly formulated through an error analysis. Then we propose a dual light sources framework that yields two identical beams to measure the visibility, which is advantageous over the single light source method and capable of measuring high visibility. In the experiments, the stability of the dual light sources is firstly tested by a 72-hour running. The average luminance ration of dual light sources is 0.9932 and the average relative error is 0.04%. The relative error of dual light sources luminance ration is only 0.2% when the fluctuations of single source is as high as 2.28%. Then the dual light sources is applied in the digital image night visibility measuring system to evaluate its validity. The result shows that the dual light sources method is capable of measuring the range of 390 times of baseline (40m baseline) with the error less than 15%, which fully meets the meteorological demands.
Fast Pedestrian Detection Based on GPU+CPU
Authors: Liu Heng Li , Zhou Si Yue , Yuan Zheng Peng , Wang Yu Chi
Published: July 2013

Accurate pedestrian detection is required for practical applications such as automotive and security applications. However, the implementation does not have enough performance because the present schemes are not sufficient. In this paper, the authors proposed parallel implementation of HOG-based pedestrian detection on GPU to obtain real-time processing results. By the proposed implementation, the total processing speed becomes 60 times faster than that of original one on frame rate and real-time processing is achieved.
An Algorithm of Schatten ρ-Norm Regularized Least Squares Problems for Video Restoration
Authors: Liu Lu , Huang Wei , Chen Di Rong
Published: July 2013

Minimizing the nuclear norm is recently considered as the convex relaxation of the rank minimization problem and arises in many applications as Netflix challenge. A closest nonconvex relaxation - Schatten norm minimization has been proposed to replace the NP hard rank minimization. In this paper, an algorithm based on Majorization Minimization has be proposed to solve Schatten norm minimization. The numerical experiments show that Schatten norm with recovers low rank matrix from fewer measurements than nuclear norm minimization. The numerical results also indicate that our algorithm give a more accurate reconstruction