bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Simulation Optimization of Casting Process for Aluminum Alloy Engine Cylinder Head
Authors: Pan Xiu Xiu , Yang Yi , Yang Gang , Yin De Qiang , Zhou Yu
Published: February 2014

The liquid metal filling and solidification process of aluminum engine cylinder head in different gating system during casting process was simulated by casting simulation software MAGMAsoft. The simulation results showed that the best pouring process contains the bottom note type casting and the placement of combustion chamber side, so that we could obtain a simple modeling process, and significantly shorten the trial production cycle, as well as the trial cost of the piston, and improve the quality of the cylinder head.
Design and FEM Analysis of a Large Turning Table
Authors: Wang Wei Shun , Zhang Qing , Ma Hong Liang , Hong Cheng Dong , Wang Jin Liang , Bai Guang Yong , Liu Yin Feng
Published: February 2014

Introducing the design of a large turning table. The table structure is combined with three-body, double-ring hydrostatic guide-way consists of inner and outer rings, it has the advanced features of high carrying capacity, high rigidity, high precision and good holding of the second fitting precision. Table rigidity and former six-stage modal shape are resulted by the finite element analysis, the result proves the rationality of the design. The design has been applied to the 25m vertical lathe successfully and obtained a good effect. The design solved lots of questions such as casting and machining and transport of a large table, it has reduced the cost greatly.
Optimal Design of Heavy Load Hydrostatic Center Rest
Authors: Wang Wei Shun , Dong Xue Zhe , Wu Ying , Yun Tong Shu , Bu Ming Zhu , Chen Dong Liang , Ma Wei Ming
Published: February 2014

In order to solve the lubrication problem of the hydrostatic center rest, a optimal design concerning structure of hydrostatic center rest is studied. ANSYS has been used to compute three-dimensional stress and deformation fields of hydrostatic center rest. This research analyzes the stress and deformation of hydrostatic center rest, and it has revealed its stress and deformation distribution law. Results indicate that a characteristic will be improved by optimal design and the reliability of a hydrostatic center rest can be predicted through this method.
Active Control Methods of Cutting Burr in Precision and Ultra-Precision Machining
Authors: Huang Juan , Zhu Yun Ming , Li Qin Feng , Wang Gui Cheng
Published: February 2014

The burr formation and control is one key technology of achieving precision and ultra-precision machining and automatic machining. Based on the theory of system engineering, the metal cutting burr formation, control and removal technology system are constructed in the paper. Then, the basic principles of burr control are presented. Combined with precision and ultra-precision machining and automatic machining, the active control methods and technologies of burr are presented. They are the modified design of parts structure, the option of tool geometry parameters, the adjustment of cutting data and processing technologies optimization etc. So, these methods lay a solid foundation on achieving minimum burrs.
Characteristic of Residual Stress Distributions at Workpiece Surface in Grind-Hardening
Authors: Wang Gui Cheng , Hua Chong Lue , Zou Jun Feng , Pei Hong Jie , Huang Juan
Published: February 2014

The grinding process is currently used for machining the parts requiring for good precision. However, the apparition of some damage related to this process is still uncontrolled, in which the major deterioration is from the residual stress. Through grinding and hardening test, the residual stress distributions under different grinding speeds are obtained, and then numerical simulation for thermal stress of the workpiece surface is carried out by finite element software ANSYS to deduce the distribution of phase transformation stress under different grinding speed.
Characterization Method and Evaluation System of Surface Integrity in Precision Machining
Authors: Huang Juan , Zhu Yun Ming , Pei Hong Jie , Wang Gui Cheng
Published: February 2014

The importance of the surface integrity in modern machining is represented. Based on the notion of the surface integrity that was put forward by Michael Field, a new method of surface integrity characterization is presented in this paper. This method consists of surface quality, surficial coat quality and the edge quality. Then an evaluation system of surface integrity based metrology is constructed and has been applied in a machining process of nickel-base alloy turbine disk. The manufacturing time decreased by approximately 10%. In all, this characterization and the evaluation system of surface integrity are rational and efficient. This work let us be capable of breaking through in the systematical evaluation of present machining surface.
Wind-Induced Vibration of the Rear-View Mirrors of Car at High Speed
Authors: Xiong Cheng Chen , Chen Hao Yan , Fan Zhou
Published: February 2014

Rear-view mirrors vibration that was dangerous when the car is moving at high speed poses a serious threat to traffic safety. The wind-induced vibration has been one of the urgent issues in rear-view mirror system. The air power generated when the car is fast moving and inertia force generated when the rear-view mirror vibrates, constitute a feedback process in the form of a closed loop, so that the amplitude will increase with time. A gas excitation model coupled rearview mirror with air flow vibration was established. CAE analysis method was adopted to prove the theoretical methods.
Research of Resonant Machine Nonlinear Vibrating Characteristics
Authors: Wang Hua Kai
Published: February 2014

Studying the core component of the resonant machine by building the bench test system, utilizing the nonlinear analysis function of Abaqus/Explicit to solve the problem that the rigid-flexible coupling model can`t take the material nonlinearity into adequate consideration. Simulating the nonlinearity of the vibrating beam by doing time integration over the kinematic equation to obtain an accurate and reliable result. Firstly, simplifying the bench testing system to simulating the low frequent vibration; And then, comparing the acceleration root value between the test data and the simulating result on the characteristically point to check the reliability and accuracy of the simulation; By studying the hammer vibrating amplitude curve and shear stress curve changing along the rubber spring thickness, providing a preference for the optimization.
Research on Making Constant Valve Block of Residual Compressive Stress Based on Ultrasonic Testing
Authors: Liu Hai Yang , Xu Chun Guang , Song Wen Tao , Pan Qin Xue , Li Xiao , Meng Fan Wu
Published: February 2014

We proposed a new method of measuring the residual stress for the component based on the acoustoelastic theory and focused on a new technology of making constant value block of residual stress by shot peening in order to solve problems of residual stress testing by ultrasound. Monitored the residual stress value of block by self-developed ultrasonic residual stress measurement system. The results indicate that the value of the test block changes not much, so it can provides a new way to improve the ultrasonic testing of residual stress.
Surface Crack Analysis of TiN Coating in the Sliding Friction Contact Conditions
Authors: Feng Jian Jun , Yang Xiang Fan , Xue Lei
Published: February 2014

In order to reveal the failure mechanism of TiN coating, the simulations of scratch process with finite element method are carried out. Meanwhile, the stress analysis was carried out on the three stages that stylus tip indenting coating surface, slipping on coating surface and rising from coating surface. Through the observation of simulation results and the analysis of the stress shows that there are two ways of forming coating surface cracks. One is that coating interface cracks are firstly induced, thus they are propagated to the coating surface, and finally the surface cracks are formed. Other is that cracks are directly formed in coating surface. Because they are induced by maximum tensile stress, surface cracks are modeI.After stylus tip rising from coating surface, biggish residual stresses remain in the coating. Those analyses will supply the basis of coating design and application.
Effects of Air Resistance on Flight Based on Elastic-Plastic Mechanics
Authors: Liu Jun Qian
Published: February 2014

Basketball skills have the features of difficulty, complexity, demanding, and being more difficult to master. For basketball, the flight trajectory of basketball and its stress analysis have become the hot issues researched by many experts and learners. And throughout the flight, basketball shooting naturally becomes the focus of our study. At present, there are a lot of shooting skills articles, but it mainly focuses on the skills analysis and implementation specification of action, and some evaluation methods of shooting psychology, also it lacks some quantitative theoretical study. Based on the elastic-plastic mechanics theory this paper explores the influence of air on basketball flight, which can provide a theoretical basis for the guidance of basketball this kind of ball sports in the future.
The Error Analysis of Surface Machining on the CNC Machine Tools
Authors: Zheng Dong Xi
Published: February 2014

The surface machining is more and more in modern manufacturing, it is able to machine the high precision surface by CNC machine tools, but there are many cutting errors yet. To reduce the cutting errors in surface machining effectively, the paper analyzed the errors of surface machining by flat milling cutter on theory, it found the main reasons of cutting errors in machining the surface, and got the method to compensate the errors, so it provided the theoretical basis of compensation algorithm of cutting errors in the machining the surfaces.
Thermal Stress Analysis and Structural Optimization of QiRui Exhaust Manifold
Authors: Wang Hong Wei , Zhang Jin , Wei Jian Kang
Published: February 2014

The thermal stress analysis of car exhaust manifold is one of the hot research issues. The finite element model of QiRui exhaust manifold was established. Temperature field was gained by using numerical simulation, by mapping the above result as boundary condition of exhaust manifold; the distribution regularity of the thermal stress of QiRui exhaust manifold was gained. The analysis result shown that there serious stress concentration between the reinforced rib and exhaust tube, the maximum stress reached to 330Mpa, which is high enough to destroy the tube. By improving the rib structure, the maximum stress can drop to 280Mpa, and the stress distribution also smoother than the original.
Organizational Field Forecast during Heavy Rail Quenching Process by Air Cooling
Authors: Li Xin Can
Published: February 2014

Organizational field is a vital parameter in quenching process. the phase changing temperature of steel U71Mn was got based on its CCT curves. Through cooling curves of several key points, the cooling rate at phase transition point was calculated. By comparing with every microstructures critical cooling rate, the final cooling microstructure was predicted. Relative tests showed that the prediction was reasonable.
Research and Development of Multi Section Floating Mechanical Wave Energy Power Generation Device
Authors: Fang Zi Fan , Ma Zhen Hao , Fang Jing , Gao Shu , He Kong De
Published: February 2014

In order to study the principle of wave power generation, a multi section floating mechanical wave energy power generation device and a rectifier voltage regulator circuit are designed. The device consists of multi cylinder buoys, direction changing and speed-up mechanism, generator, rectifier voltage regulator circuit and other components. According to the certain regulation of wave movement, the structure and parameters of the wave energy capture device are designed; based on the movement characteristics of wave energy capture device, the direction changing and speed-up mechanism is designed, including crank-rocker mechanism and gear mechanism. The rectifier voltage regulator circuit is designed by the law of generator output. The experiment research shows that the efficiency of wave energy power generation device is up to 45.8% under the condition of prescribed test wave.
Timing Belt Module Analysis of LED Placement Machine Based on Virtual Prototyping
Authors: Xiao Yong Shan , Zhao Zhen Yu , Zhou Yong Quan
Published: February 2014

Based on MSC.ADAMS, the virtual prototype of two design schemes is built in the timing belt of LED placement machine, and simulation analysis of two design schemes of timing belt module is made. Simulation results show that, the timing belt model in the motor-middle-driven design is better than the motor-side-driven model in the synchronization performance. Based on the method, the performance of timing belt can be obtained before the prototype manufacturing, and the result can guide the timing belt design in LED placement machine.
Optimization and Numerical Simulation of Locking Mechanism
Authors: Cai De Yong , Liu Fu Jun , Tang Gong Min
Published: February 2014

The mechanical model of a new spring locking mechanism was established. The optimum spring parameters of the locking mechanism which meet the design requirements were provided by optimization. Using the finite element method, numerical simulation of working process of the locking mechanism was carried out. The rationality of optimization result was verified by simulation results of numerical simulation.
Rapid Calculation of Trimming Line for Panel Flanging Forming
Authors: Di Chi
Published: February 2014

Calculating the trimming line is an important step for the panel flanging. In this paper, we use the one step inverse finite element method to calculate the trimming line for auto panels flanging, the finite element model of flanging forming is established and completed the iterative solution of the equation, using the reverse deformation method to establish the linear elastic balance equation to solve the iterative initial value, and thus get the trimming line accurately and rapidly. Through the calculation of the trimming line of some flange part verified the effectiveness of the algorithm.
Numerical Simulation of Air Distribution Plate at the Inlet of Wet Electrostatic Precipitator
Authors: Zhang Jin Feng , Li Zai Xing , Li Wei , Gao Ying , Li Qiang
Published: February 2014

The air distribution uniformity of electrostatic precipitator is one of the key factors to affect the efficiency of dust collector. A layer of air distribution plate was set in precipitator and its opening rate of distribution plate was adjusted to explore the optimal allocation of air distribution in the precipitator. With the design requirements, we used the Fluent to simulate the airflow distribution in the precipitator. The results show that it can obtain more uniform air distribution to adjust the hole shape and the opening rate of air distribution plate, and the efficiency is ideal when the opening rate is 30%.
Computer Aided Assembly for Modular Fixture by Introduce Library of Fictitious Subassembly
Authors: Liu Ping , Li Ning
Published: February 2014

Computer Aided Assembly for Modular fixture based on UG is proposed. In it, the fictitious subassemblies, for example locating and guiding fictitious subassembly, is introduced. Thus it is come true that assemble is up to down for modular fixture. The efficiency of computer aided assembly for modular fixture is largely enhanced.
Defects Detection of Printed Circuit Board Based on the Machine Vision Method
Authors: Wang Wen Bin , Liu Dao Yuan , Yao Yu Qin
Published: February 2014

The processing of target image using image processing technology, can realize the non-contact online detecting circuit board, thus greatly improve the detection efficiency, reducing the defective rate. This paper provides the detection system based on the methods of pre-processing the standard circuit board image and the circuit board image to be detected, two value segmentation, morphological image processing, image registration and poor shadow detection processing, among them ,image registration is the key. In order to improve the processing speed to achieve real-time processing, image registration using rapid processing algorithm. Analysis of the experimental results, the method can detect the defects on the circuit board to be detected accurately, and can achieve the automatic real-time detection purposes.
Volume Measurement Method for Irregular Objects Based on Shape from Shading
Authors: Dang Hong She , Guo Chu Jia
Published: February 2014

In this paper, we propose a volume measurement method for irregular objects. And three cameras were used in the image acquisition system. In order to reduce the intensity level and be more coincident with the 3D reconstruction method, a method called Histogram Acceleration has been used. Instead of using the regular shape from shading method, the relation between intensity and the missed 3D information was found. This method is valid within a certain error range. Its showed by experiment that this method has a good performance when dealing with objects with a smooth and convex surface.
Research on Web-Based Elevator Failure Remote Monitoring System
Authors: Liu Xiu Kuan , Chen Yao , Yu Hai Ning
Published: February 2014

Recently, elevator failure arose frequently, and has been gradually increasing. An elevator failure remote monitoring system is indispensable to enhance security of and maximize the total facilities efficiency. We reuse existing web technologies and standards to design a web-based elevator failure remote monitoring system which is independent of elevator manufacturers own monitors and complies with the REST architectural style to provide a universal API. We also propose nine types of detectable failure and their detection methods.
Study on Photovoltaic Array Design for Solar Energy Vehicle
Authors: Chen Ding Yue , Chen Li Hao , Tian Feng , Yang Cheng , Xu Dong
Published: February 2014

The solar energy reserve is huge, distribution of a wide range, clean and safe. This article mainly from the basic principle of solar cell start, described the solar energy vehicle generation electricity mode and the structure of photovoltaic array system, discussed its structure and process characteristics, puts forward a new design method of the solar photovoltaic cell array, calculation model of solar energy vehicle photovoltaic cell array were established based on maximum output power and dimension, research results on the solar energy vehicle photovoltaic cell array are briefly presented in this paper lastly. The reference for the development and use of solar energy vehicle are provided.
Analog Circuit Fault Diagnosis Based on Principal Component Analysis of Pretreatment and Particle Swarm Hybrid Neural Network
Authors: Huang Guo , Han Bao Ru
Published: February 2014

With the rapid development of electronic technology, the system reliability and economic requirements of the importance of the analog circuit fault diagnosis has become increasingly prominent. Aiming at the shortcomings of traditional diagnosis method, the paper presents an analog circuit fault diagnosis method based on principal component analysis of pretreatment and particle swarm hybrid neural network. The method adopts hybrid algorithm to adjust the network weights and thresholds to avoid falling into the local minimum value, which uses principal component pretreatment effectively reduce the complexity of calculation. Simulation results show that the diagnostic method can be used for tolerance analog circuit fault diagnosis, has better application prospect.
Parallel Fault Diagnosis of Power Transformer Based on MapReduce and K-Means
Authors: Wang De Wen , Liu Xiao Jian
Published: February 2014

Fault diagnosis can insure the power transformer safety and economic operation, and the data mining is the key technology of fault diagnosis for power transformer. In order to achieve the fast parallel fault diagnosis for power transformer, we need to put cloud computing technology into the smart grid. We give a parallel method of K-means based on MapReduce framework on the Hadoop distributed systems cluster to diagnose operation state of power transformer. Finally, through transformer fault diagnosis experimentations of massive DGA data, the results indicate closely linear speedup with an increasing number of node computers.
The Engine Oil Sump Radiated Noise Optimization Design
Authors: Wang Liang , Sun Xiao
Published: February 2014

This paper introduces the meaning of reducing the radiated noise of oil sump. By using Hyperworks and Nastran, the modal analysis and optimization design of engine oil sump are finished. This paper aims at avoiding the actual measured inherent frequency by increasing modal frequency to reduce the radiated noise. At the same time, the optimum quality allocation of oil sump can be achieved. The result of optimization design can be proved through the test.
A Method of Calculation on Balance Resistance of Measuring Bridge in Strain Test
Authors: Wang Yong Qiang , Li Wei Hong
Published: February 2014

Considering the scattering difference in resistance of the strain gauge which will cause the bridge unbalance, the designers of strain measurement instrument have to add bridge-balance circuit into the design of measuring bridge in order to eliminate the problem of a DC component output caused by the unbalance. Thus, in the design of the bridge-balance circuit, the selection of balance resistances is of great significance. In this paper, through calculation analysis of the balance bridge, we obtained a couple of ideal values of balance resistances and tested them by experiments. In this condition, the experimental results have shown that the circuit has a great ability of regulation equilibrium. In brief, this paper provides the designers an effective method of choosing the balance resistances.
Study on Influence of Array Number to PD Direction Finding Accuracy
Authors: Xie Qing , Liao Feng , Yang Hai Tao , Hu Wei Tao
Published: February 2014

Transformer partial discharge ultrasonic array detection method is a new method with high signal-to-noise ratio and high reliability. But the influence of array number to the direction finding accuracy needs to be further studied. Simulation of direction finding angle with the 15 kinds of sensor array (-arrangement) under two conditions of the acute azimuth and obtuse azimuth , study of change rule of direction finding accuracy of the different array number, for example of the square planar array sensor, based on an improved MUSIC(Multiple Signal Classification) algorithm. The results show that the direction finding accuracy increases as the array number rises, and The specific error ranges of array sensors of different array number by simulating have some degree of guiding significance in the selection of transformer partial discharge ultrasonic array sensor in the field environment.
HIRFL Water Pressure Monitoring System Research and Design
Authors: Li Yun Jie , Wang Yan Yu , Zhou De Tai , Yin Jia , Su Jian Jun , Ma Xiao Li
Published: February 2014

The HIRFL system is the most advanced heavy ion research equipment in China. Every year, we use it to do a lot of important scientific experiments, so it is very important to ensure it safe operation, which is the responsibility Institute of Modern Physics Chinese Academy of sciences. In the HIRFL system, many of the magnet and power need water for cooling, so the water system plays an important role. This paper designs a water pressure monitoring system in order to guarantee the normal operation of the water system and provide chain protection. It can monitor the water pressure throughout to the HIRFL system in time, and intuitive computer display in the control room. This paper gives the theory design, and the concrete practice, and evaluates the effect after the field operation.
Heterogeneous PLC Control Communications and Fault Intelligent Diagnosis
Authors: Lv Dong Mei , Han Jiang , Yang Liu Qing
Published: February 2014

As an industrial control computer,PLC has been widely used in industrial automation area. Through the bus interface module or industrial Ethernet interface module, PLC can communicate with the master PLC, and realize fault intelligent diagnosis. There are all numerous types of PLC, they have respective advantages and disadvantages, and can meet the needs of the user, but in shape, form, function, programming, they are not identical. This paper mainly introduces Mitsubishi PLC, Siemens PLC and OMRON PLC, simultaneously researches their respective communication characteristics and method of fault diagnosis, provide users choosing PLC a theoretical reference basis.
Development on Fault Detection and Diagnosis of Unmanned Aerial Vehicles
Authors: Zhang Yi Peng , Cao Ke Cai
Published: February 2014

The reliability of unmanned aerial vehicles (UAVs) has caught the attention of many researchers in the past decades. This paper presents a review on the development and important issues of state-of-the-art researches in the field of fault detection and diagnosis (FDD) techniques. Faults on an individual unmanned aerial vehicle or a group of unmanned aerial vehicles are considered for providing an overall picture of fault detection and diagnosis approaches.
Test Case Generating for Integrated Modular Avionics Software Health Monitoring
Authors: Zhang Hui Nan , Wang Shi Hai , Diao Xiao Xu , Liu Bin
Published: February 2014

Avionics software is safe-critical embedded system and its architecture is evolving from traditional federated architecture to Integrated Modular Avionics (IMA) to improve resource usability. As an architecture widely employed in the avionics industry, supports partitioning concepts. To insure the development of the avionics software constructed on IMA operating system with high reliability and efficiency Health Monitoring (HM) has been shown to be a key step in reducing the life cycle costs for structural maintenance and inspection. In this paper , we propose a model-driven test methodology using Architecture Analysis &Design Language (AADL). It proposes modeling patterns of IMA errors to support the test case generating mechanisms of the HM module, proposing 3 kinds of test cases that can be injected in the HM to stimulate these kinds of errors, and we present the preliminary results that can meet the satisfactory from a ongoing project based on IMA system.
A Non-Invasive Oil Temperature Measurement Technology Based on Heat Transfer Model
Authors: Cai Wei , Xu Wen Hua , Dai Min Qiang , Li Hui
Published: February 2014

Oil temperature plays a key role in state monitoring and fault diagnosis of hydraulic systems. Traditional methods for measuring oil temperature are neither convenient nor safe. In this paper, a non-invasive test technique together with its calculation model for obtaining fluid temperature is proposed by measuring the pipe surface temperature and the ambient temperature. A series of experiments had been carried out on different pressure values, and the oil temperature calculation model proposed was optimized accordingly. Experimental results show that this measurement technique together with the model can provide a fast and accurate way of oil temperature testing non-invasively under different pressure conditions, so it can be introduced to the hydraulic system application.
Design of Insulation Resistance Measurement System for Electrical Steel Sheet Surface Coating
Authors: Liu Kan , Li Jun Yun
Published: February 2014

The surface coating of insulation resistance is one of the key technical indexes of electrical steel sheet, and one of the important parameters of the products of electrical steel sheet. Nowadays the surface coating of insulation resistance device is relatively heavy, measurement error is relatively large, and measurement repeatability is not good. To solve these problems, we design an insulation resistance measurement system based on Infineon XE166 microcontroller. This article analyzes the measuring principle of silicon steel coating surface insulation resistance and includes the three aspects of mechanical, circuit and software. The experimental results validate the feasibility of this system. The measurement system is stable and reliable, high repetition rate, and has a good application prospect.
Detection and Location of Pipeline Leak Based on Multiscale Correlation
Authors: Li Da Hui , Jin Tao
Published: February 2014

In the paper, firstly establishes the pipeline system model based on the principles of correlation analysis, and determines the correlation characteristics of pipeline flow and pressure. Secondly multi-scale analysis is introduced into dynamic system processing. A leak detection method is shown with the multiscale correlation analysis, and is compared to the residual correlation analysis; it overcomes two the mistakes with different nature, such as too much interference or loss of leakage signal details. Finally through the actual data verification, the methods suitable for mutation signal, but slowly changing signals need to find another method.
Nonlinear Dynamic Compensation for Probability Analysis in Fault Diagnosis of Electric Equipment
Authors: Cui Hao Yang , Xu Yong Peng , Wang Jia Lin , Tang Nai Yun , Chu Feng Hong , Yang Jun Jie , Tang Zhong
Published: February 2014

A nonlinear dynamic compensation for probability analysis in fault diagnosis of electric equipment was reported. Because of the limitations of Threshold temperature diagnosis method and the traditional Bayesian theory fault diagnosis method of electric equipment, a nonlinear SGompertz model and quadratic power model were used to compensate the diagnosis results for the influence of equipment aging and running temperature, then the maximum probability principle was adapted to judge whether the equipment is in malfunctioning state. The 3-D simulation results indicates that: (1) there is a strong relationship between the status and equipment aging and running temperature; (2) an obviously difference exists between linear and nonlinear compensational results of the characteristic temperature region. This proposed methodology is testified having important significance in improving the reliability and the information level of power transformers operation.
The Design of the Ground Freezing Monitoring System Based on Zigbee
Authors: Guo Fang , Duan Jia Yong , Zhai Yan Zhong
Published: February 2014

In this paper, one ground freezing monitoring system based on Zigbee is designed. System is divided into four parts: sensor cable based on 1-wire technology, monitoring terminal with a drive circuit based on Zigbee, Zigbee coordinator and monitoring host with the function of network. This paper mainly introduces the network communication system. The system is suitable for the construction site of the engineering test; anti-interference and robustness of system are strong. It implements the project managers and experts operation of real-time control without time and space limits for freezing monitoring system. It provides technical support for the application of freezing engineering.
Research on the Gearbox Fault Signal Relation to the Sensitivity of Variable Working Conditions
Authors: Ren Guo Quan , Zhang Wen Chen , Li Ben
Published: February 2014

Established the gearbox fault model and simulated it at different load conditions view of the problem with gearbox experimental technique research under the variable speed and load conditions. The law between the changes of rotational speed and load with the system vibration signals was investigated and the corresponding optimal test fault condition was given. Based on this, validated the feasibility on fault diagnosis by increasing (decreasing) speed signal and found that the different load will have a different influence on the different fault signal. The different diagnostic purpose should be considered to design load conditions.
Hydraulic Mental Structure Health Diagnosis Weighting Method
Authors: Yang Kun , Yang Guang Ming , Huang Yong , Jing Pan De
Published: February 2014

By means of inductive analysis the health diagnosis weighting methods in engineering, this paper discusses the basic principle, advantages, disadvantages and applicable scope of weighting methods. On the basis, combining with multi-level, multi-standard and multi-factor characteristic of hydraulic metal structures health diagnosis, the methods of AHP, information gain, information diffusion and improved entropy are studied, which are applicable to hydraulic metal structures health diagnosis weighting. Based on fuzzy theory, the fuzzy multi-level comprehensive weighting method is put forward and studied, which combined both subjective and objective method advantages and its complementary. In addition, it provides the necessary theory foundation and new ideas for the development of hydraulic metal structure health diagnosis technology.
Research on Radiation Emission Based on Surgical Power Device
Authors: Guo Yi Jun , He Chun Lan , Fu Min Jie , Chen Yong Hui , He Jian Jun , Li Guo Quan , Lin Jin Zhao , Zhao Zhi Qiang
Published: February 2014

According to the common problem that radiation emission exceeds (one domain of electromagnetic compatibility) of DK-N-MS surgical power device, we use the EMC standard as a guide, understand radiation emission testing mechanism, analyze its radiation exceeding cause, and then take effective rectification measures. Testing experiments show that it meets the EMC requirement, improves devices stability and reliability. Moreover, it provides a guiding design for subsequent devices.
A Circuit Design of Spectrum Signal Acquisition with Low Noise and Wide Dynamic
Authors: Zhang Peng Fei , Cao Peng
Published: February 2014

Using spectrum signal acquires the information of printing colors, it has the advantages of fast response speed, wide color gamut range, high resolution, etc. And it is the key techniques in the print ink control. In this paper, it introduces a broadband and large dynamic spectrum signal acquisition circuit. It uses micro photoelectric diode array spectrum sensors, processing analog spectra signal with broadband low noise amplifier. It realized the low noise large dynamic performance through analog-to-digital converter (A/D), signal preprocessing and the optimal design of power circuit. Its spectral wavelength resolution is 0.3 nm, range from 15 to 400 lumens (lm) illumination spectrum signal acquisition, within the scope of the design of the system signal-to-noise ratio to 45 dB.
Modeling and Analysis of Ultrasonic Phased Array Transmitting Systems
Authors: Wang Li Jiu , Li Shuang
Published: February 2014

The components of the ultrasonic phased array transmitting system is analyzed and theoretical model of ultrasonic phased array transmitting system is developed. The simulation result shows that the model is reasonable.
Parallel Factor Analysis for Gas Sensor Array Signals
Authors: Zhang Wen Na , Qin Guo Jun , Hu Niao Qing
Published: February 2014

Data from sensor array are often arranged in three-dimension as sample × time × sensor. Traditional methods are mainly used for two-dimension data. When such methods are applied, some time-profile information will lost. To acquire the information of samples, sensors and times more exactly, parallel factor analysis (PARAFAC) is investigated to deal with three-way data array. Through the analysis and classification of three kinds of oil odor samples, the performance of PARAFAC in gas sensor array signal analysis is verified and validated.
Incentive Optimization Design of GMI Sensors
Authors: Xiao Jing , Duan Xiu Sheng , Teng Dian Jun
Published: February 2014

. With the advantages of high sensitivity, good reliability, small size and being good at resisting bad environment, GMI sensors are potential in applications of engineering. Generally speaking, incentive scheme of GMI sensors determines whether the GMI effect can be generated sufficiently, which may have an important effect on the sensors sensitivity and measurement range. The paper analyses current GMI sensors incentive scheme, then proposes two incentive optimization designs. The schemes can fully generate non-magnetic materials GMI effect. Meanwhile, performance of the sensor can be greatly improved.
Research on the Automatic Focusing Technique of Image Precision Measurement Based on Edge Detection
Authors: Cao Zhi , Jin Yan , Li Min
Published: February 2014

Along with the continuous development of image precision measurement technique, in the precision imaging system, automatic focusing technique is becoming more and more intelligent. Automatic focusing technique of image precision measurement based on edge detection has become a hot topic in the current research field. On the basis of edge structure features, this paper firstly analyses the commonly used edge detection technique in the image precise measurement. Based on this, it combines the SUSAN filtering algorithm for different edge image value types to introduce Gauss filter parameter σ to locate the edge, so as to improve automatic focusing function of imaging. The experimental results have shown that the method can obviously filter noise, and has a significant automatic focusing effect.
Vision-Based Industrial X-Ray Film Digitizing and Automatic Identification System
Authors: Gu Chun Qing , Yan Zhi Hong , Liu Qiang , Song Yong Lun
Published: February 2014

In this paper, a set of industrial X-ray film digitizing and automatic identification system is established with machine vision equipment. With this system, the industrial film can be digitalized rapidly and in high space resolution reaching to 860 DPI. The machine vision equipment includes linear CCD, light source, lens, aperture and film-moving machine. The controller is a master-slave mode, which includes a PC as the upper computer and an embedded system as the lower computer. The embedded system is composed by ARM and FPGA modules, which can control four axis motors and transmit an external trigger signals to the CCD in real-time. At last, a series of image processing algorithm is also developed in this paper to identify an industrial film that is captured to test coupling alignment of the casing pipes. The testing accuracy is 0.06mm.
Wireless Data Acquisition System for Vibrating Sensors
Authors: Chen Shuang Rui , Yan Quan Sheng , Chen Shuang Cong
Published: February 2014

In order to overcome the disconnection and high cost and maintenance difficulties of the conventional data collection systems for structure monitoring of long span bridge, we developed a low-cost and effective data acquisition system composed of several wireless communication modules connected to vibrating wire type sensors. This system has the function to change conventional wire-based data collector into wireless one instantly. The prototype of wireless data acquisition system for vibrating sensors is described in this paper. Laboratory tests demonstrate that the wireless data acquisition system is of high accuracy and good stability. In addition, the application of this system to the strain monitoring of a large steel box arch shows the wireless data acquisition system with good performance improve the efficiency of data acquisition and reduces the cost of monitoring.
Real-Time Estimation of System Reliability Integrating Sensor-Driven Prognostic Model with Modular Approach
Authors: Tao Yong Jian
Published: February 2014

Real-time reliability estimation is very significant for system operation safety, particularly in railway transportation system. This paper proposes a method, integrating sensor-driven prognostic model with modular approach, to accurate estimate system real-time reliability. Modular approach is utilized to divide system fault tree into independent subtrees (modulars), and solves system reliability using Binary Decision Diagrams and Bayesian Networks according to their characteristics. Sensor-driven prognostic models use in situ sensor data from system components to compute their failure density functions or reliability functions, and continuously update system reliability. The method for system reliability assessment presented in this paper, integrating sensor-driven prognostic model with modular approach can overcome static characteristics of reliability analysis, and better correspond to practical applications.
The Curing Behavior of Organosilicone Materials for Large-Power LED Packaging
Authors: Yang Ming Shan , Yan Ran , Yan Yu Hong , Liu Yang
Published: February 2014

The organosilicone gel material for large-power LED packaging was prepared through Si-H addition reaction of hydrogen-silicone with vinyl-silicone catalyzed by Pt coordination compound in this paper. The curing behavior was investigated by DSC method, and the curing dynamic parameters were obtained, i.e., the curing activation energy and reaction level of the system were 79.23kJ/mol and 0.8271 respectively, the initial curing temperature, maximum curing temperature and post-curing temperature were 75°C, 90°Cand 120°C, respectively, which supplied the basic data for the preparation and application of organosilicone materials for large-power LED packaging.
Key Performance Information Collection Architecture Based on Cloud Computing
Authors: Chen Bin , Wang Zhi Jian , Qi Rong Zhi , Lv Xin
Published: February 2014

Cloud Computing has become another buzzword in recent years. Follow the popular research and use of the cloud system the performance become the bottleneck of the Newborn. More and more researches are turning their attention to analyze the performance of the cloud services. However, it is hard to extract accurate information from the different type of the cloud components such as datacenter, host, Virtual Machines (VM) in the cloud. Thus, it is significant to collect sufficient row data of the Cloud systems for the performance analysis. In this paper, we described an analysis framework to evaluate comprehensive performance guideline of cloud computing center. The analysis architecture is built based on the performance agent and server interface method (PASI), which consists of performance client (PMC), performance agent (PMA) and performance server (PMS), and we put forward a mathematical model based on the PASI information and queuing theory to forecast the idle rate and availability of the cloud environment. It is proved that the PASI architecture is correctly and effectively evaluates the performance of the cloud component and whole cloud environment.
Analysis of the Development of Fire Control System
Authors: Ji Yi Guo , Ge Xing Guo , Lan Zhi Huan , Tian Chun Yan , Chen Cui
Published: February 2014

Fire control system has been existed for over 60 years and plays more and more important roles in the war today. The process of development of the avionics system in general and its modification are described. The technique performance and properties of several fire control system seekers are analyzed, and development trend are discussed.
An Interactive and Artistic Monitoring System for Machine Condition
Authors: Luo Lin , Hu Fu Wen , Zhang Nai Song
Published: February 2014

Most machine health monitoring techniques are likely to suffer from ineffective selection of state features, and the increasing redundancy of raw signals. As a new strategy, an interactive and artistic monitoring approach is presented. Its basic concept is to transform raw signals into artistic graphs rather than obscure waveforms. The entire procedure includes three steps: signal acquisition, plotting artistic graphs and interactive diagnosis. In the case of numerical control machine tools, an interactive and artistic monitoring prototype system is developed based on the integration of the open-source Arduino platform and the open-source Processing language. Experimental results indicate that the artistic visualization of measured data facilitates the identifications of machine condition and the diagnosis of observed symptoms.
Research on Closed-Loop Control Algorithm of Pneumatic Clutch Based on Optimizing Engaged - Schedule
Authors: Li Xing Zhong , Lei Yu Long , Sun Shao Hua
Published: February 2014

According to the automatic control system of pneumatic AMT clutch, this paper proposes a novel PID control based on logical switch of clutch engagement index. The PWM control is used to make a control for the solenoid valve. And a controller is established by this control algorithm. The automatic control system of pneumatic AMT clutches modeling using the AMEsim software, related simulation analysis and modifying the control parameters of the controller. It is conducted stand test according to the test scheme for the clutch automatic control system. And the test data is record and made an analysis on. The control algorithm is verified by stand test, greatly improving the bonding quality of the clutch.
Precise Determination of Band Gap Naturally via Absorption/Reflectance/Transmission Spectra
Authors: Liu Ya Jie , Zhu Ning
Published: February 2014

A set of nonlinear equations about the band gap and the indexnof material property with the absorptance, reflectance and transmittance were produced based on Tauc relation. Optimizing fitting the experimental spectroscopy data, such as absorption, reflection and transmission, the band gapand the indexnrelated to the material property could be obtained accurately and reliably. Meanwhile, the experimental data were used as more as possible, and the artificial errors at pre-determining the indexnwere avoided. The lowest correlation coefficient and the largest average relative error between the experimental and the calculated data are 0.9588 and 2.7% in all considered cases respectively. The best results show the band gap obtained from this method is more accurate, easier and faster than traditional extrapolation. Hence, this work would promote the precision and reliability for predicting the band gap and index of materials naturally.
Research on Internal Flow Field Simulation of Hydropower Station Pressure Steel Pipe Based on FLUENT
Authors: Liu Zhi Lin
Published: February 2014

The research object of this paper is one of the pressure steel pipes which is installed in hydropower station of agricultural and animal husbandry college, use the computational fluid dynamics software FLUENT to 3D numerical simulation for internal flow field of this pressure steel pipe, obtain the distribution of internal flow field and flow velocity. At the same time, analyze the bending position, verified the accuracy and rationality of the simulation.
Dragon Boat Straight Road Racing Rowing Technique Mechanical Movement Analysis
Authors: Liu Jian , Li Bing
Published: February 2014

At present the main characteristics of kinematics rowing technique at home and abroad of Dragon Boat: master the time at each stage of a pitch period ratio is an important factor to improve the dragon boat racing results. The time of each phase distribution is paddling rhythm, paddling rhythm time allocation of domestic and international dragon boat teams have a common law. The time of each phase ratio and the displacement ratio corresponding to a proportional relationship, and ultimately affect the total displacement of a propeller or. Paddling rhythm and tempo are two different concepts of mutual influence, interaction. A total displacement and pitch frequency is two important factors affecting the intrinsic speed, contradictory. The stroke length and stroke frequency of collocation, is the foundation to improve athletic performance. The total displacement into the outlet angle and pitch frequency and a relationship between the great. Research and analysis of all kinds of relations is to increase the maximum speed, reduce the speed difference, thus improve the speed.