bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Direct Drive Electro-Hydraulic Actuator Based on Internet of Things Technology
Authors: Wang Long Hui , Wang Yong
Published: June 2014

Direct drive electro-hydraulic actuator is a new type of hydraulic transmission with easy maintenance and high efficiency, which has been widely used in municipal engineering (such as water pipe network, gas pipe network), nuclear power plants, and other occasions. For these applications, we designed the electro-hydraulic valve actuator based on Internet of things technology (IOT for short). This paper introduces the mechanical structure and the working principle of the direct-drive electro-hydraulic valve actuator, analyzes IOT architecture. Detailed design was carried on according to the IOT architecture and related experiments have been done. The actuator can automatically, accurately control valve opening, be monitored by PC remotely, display device real-time information through LCD and be operated by touch screen.
Finite Element Analysis of Worm Auger in Meat Grinder
Authors: Li Shi Long , Lu Jun
Published: June 2014

The worm auger contributes to the pressures generated at the grinder plate face during grinding of meat. The axial pressure distribution along the worm auger during grinding was discussed. The pressure almost increased linearly along axial direction from feeding end to discharge end. The 3D model of the worm auger created in Pro/E software were imported into ANSYS 9.0 software and a linear static finite element analysis was performed. The visual deflection patterns the part experiences under "real world" loading conditions were obtained so as to complete the security check of strength. The results showed that the yield strength was largely improved with thread root radius increasing from 2 mm to 5 mm. Hence, this method can be applied to rapidly and correctly find those dangerous positions and existing imperfections of its structure, thus providing valuable data to judge its structural rationality before practical manufacture, so as to make further improvements and optimizations for its structural design.
A Control Strategy for Continuously Adjusting Attack Angle in Wind Tunnel Experiments
Authors: Zhang Shuang Xi , Gai Wen , Chu Wei Hua , Liu Nian
Published: June 2014

In wind tunnel experiments, in order to adjust the attack angle continuously, the support mechanism movement should be steady and smooth. However, the electro-hydraulic servo system is a typical nonlinear, time-varying and uncertainty system, and the wind tunnel environment is very complicated. To address these problems, an on-line identification and generalized predictive control (GPC) strategy is proposed in this study. Firstly, the Labview and AMESim are integrated to build an electro-hydraulic system simulation model. Secondly, the controlled auto-regressive moving average (CARIMA) model of the electro-hydraulic system is developed. Thirdly, the influence on the system performance owing to the control parameters, model parameters, and external disturbance are widely discussed and deeply analyzed. At last, a test platform is constructed with the National Instruments (NI) embedded real time technology. The proposed control strategy is tested and verified on this test platform. The experimental results show that the angular velocity control precision reaches 0.01°/s. It implies that this control strategy has a good performance for nonlinear velocity control. Thus it satisfies the requirement of the continuously adjusting attack angle in wind tunnel experiments.
Study and Analysis of Electronic Throttle Control System Applied in Hybrid Electric Vehicle
Authors: Wan Mao Song , Wu Zhi Min , Li Bing Lin , Lv Li Ya , Sun Ning , Ge Wei Lin
Published: June 2014

The composition and working principles of the constructed Hybrid Electric Vehicle’s Electronic Throttle Control System are introduced. This paper presents the control strategy, and implements the Electronic Throttle Control System based on Fuzzy PID algorithm. It analyzes the resolution, react characteristics and dynamic tracking performance of the control system, and also discusses the anti-jamming measures under the automotive complex operation condition. The real vehicle test results demonstrate that this electronic throttle control system features better tracking and robustness.
Research on Contouring Control of Dual Linear Motors
Authors: Wang Li Mei , Zheng Hao
Published: June 2014

In dual-axis contouring motion, contouring error is a more important performance index than tracking error. Considering direct drive XY table control accuracy, the influence of load disturbance and the velocity mismatch between X and Y axis are great. As a result, the position tracking iterative learning controller based on DOB controller is adopted at single axis, it can overcome the influence of the load disturbance, and ensure the robustness of the system; For the velocity mismatch between X and Y axis, a control strategy based on hybrid error iterative learning control (HILC) and the real-time contour error model was proposed. Simulation results show that the designed control system of XY table has strong robustness, high contour accuracy and simple structure.
Simulation and Analysis for Cooling System of High-Speed Motorized Spindle
Authors: Lei Chun Li , Rui Zhi Yuan , Zhou Yin Cheng
Published: June 2014

In order to improve the manufacturing accuracy of NC machine tool, it is crucial to reducing the temperature rise of high-speed motorized spindle. The cooling effect and temperature distribution of water-cooling system are simulated and analyzed based on thermodynamics, heat transfer theory and computational fluid dynamics in this paper. The results show that the cooling system has fine cooling effect; the temperature of cooling liquid is changed from low to high and then to decrease, the highest temperature is at the roundabout of helical water channel and the reason for this phenomenon is found out. The results provide the theory basis for the structure optimization for water-cooling system.
Numerical Control for Multifunction Machining Based on Dual MCU
Authors: Shen Can Duo , Zhang Xiang Hong
Published: June 2014

A new numerical control system (CNC) based on ARM9 and STC12C5410 is studied. The ARM9 core microprocessor and Samsung S3C2440A microprocessor, are the main operation cores. It treats the flowing tasks: response to keyboard inputting, display contents on LCD, interpretive the NC codes, output crude interpolations and so on. The secondary CPU, STC12C5410, as the assisting microprocessor is only to realize fine interpolation. The system can be connected an 8-inches display in order to display more information and it has an interface to a four-axis hand wheel. It has a communication interface and can receive CNC codes form other computer. The system can drive four step-servo motors or servo-actuators and realize turning, milling, grinding and combination machining, which making sure the system is a multifunction system.
Research on Optimization of Rotation Angle and Singular Area Handling in Five-Axis Post-Processing
Authors: Fan Qing Xiang , Yan Guang Rong , Liu Ben Gang
Published: June 2014

Post-Processing is the key of the transformation from CL-Data of CAM system to NC program. Since the improper selection of rotation angle will leads to collision between cutter tool and work piece and dramatic change of rotary axis in adjacent cutter-location as well as rotary angle changes rapidly and non-linear error exceeds allowable limits in singular area, We proposed a method which integrates optimization of rotation angle and singular handling in five-axis post-processing. A post–processor was developed with C++ program language based on the method, which inputs the CL-Data of CATIA NC manufacturing module and outputs the NC program. The validity of the method is verified through Vericut simulation.
The Design of Reconfigurable Machine Tools about Lathe and Milling Machine Based on Modularization
Authors: Li Xiao Zhou , Wang Chang Mei , Xu Jin Kai
Published: June 2014

Based on the concept of modularity and reconfiguration, this paper adopts the function— principle—structure modeling approach, shedding light on dividing and reconstructing the modules based on the product function and finally put forward molding scheme. The author also verifies the feasibility of this kind of modeling method with the reconfigurable machine tools in turning and milling as case study.
Establishment and Analysis of Mathematical Model of the Accuracy Identification of Five-Axis CNC Machine Tools
Authors: Shi Rong Bo , Guo Zhi Ping , Song Zhi Yong
Published: June 2014

This paper studies control and motion theory of feed system of the five-axis CNC machine tools, propose the method of establish mathematical model, kinematics model of the feed system, in order to provide a method of theoretical research for accuracy identification of five-axis CNC machine tools.
The Data Acquisition and Processing of Cutting Parameter Database
Authors: Wang Li Ping
Published: June 2014

Appropriate reasonable cutting parameters is one of the important factors to improve the product quality and the efficiency.Based on dynamic simulation optimization function of cutting parameter database through the definitions on the acquisition data standardization, the coefficient of cutting force using Dynacut dynamic test and identification experiment, and through the simulation and optimization and final of Opticut Simucut actual cutting parameters of process validation entry in the database.
A New Method Implementation of Kalman Filter Based on FPGA
Authors: Li Xin , Wang Cong , Zhang Qing Zhen , Zou Xiao Fu
Published: June 2014

Kalman filter is one of the most essential and important computing methods in the fields of control, signal processing and communication. In the past, mostly Kalman filter is implemented by DSP, but the operating speed could not meet the requirement. Therefore, the study will research the implement methods of Kalman filter based on FPGA. MicroBlaze soft core and VHDL (Hardware Description Language) are used to implement Kalman filter. The operating results will be analyzed and compared with each other.
Design and Implementation of Federal Kalman Filter Based on FPGA
Authors: Jia Long , Gao Jian , Wang Cong , Zou Xiao Fu , Zhang Qing Zhen
Published: June 2014

The Federal Kalman filter is a kind of high operational efficiency autoregressive filter, it can estimate the dynamic system status values from measurement data containing noise. This article does some research about how to implement Federal Kalman filter with VHDL language on an FPGA platform. The design successfully loaded into the FPGA platform and operated normally.
Design of Ultrasonic Anemometer Based on ARM
Authors: Zhao Kai
Published: June 2014

The basic principle of ultrasonic with time difference method of wind speed measurement was introduced, the design of ultrasonic anemometer based on ARM+Vxworks and its hardware, software and implementation were given. The system has the advantages of high accuracy, simple operation, intuitive display, scalability etc.
The Systematic Study of Music Spectrum Display Based on FFT
Authors: Jin Lin , Du Qiu Lei
Published: June 2014

Spectrum analysis is the superposition signal intodifferent frequency component and the imaginary indexcomponent, the analysis of signal from the frequency point of view. It is widely used in voice processing, image processing, digital audio, seismic exploration. The FFT algorithm, provides an effective solution forreal-time processing of frequency domain analysis. Music display system based on FFT spectrum, the main work is as follows:First, the fast Fourier transform ideas a brief description, and combined with the specific hardware and software implementations of the algorithm of the system used by the fast Fourier transform is described in detail. Then, describes the main hardware devices used in the system, including STC12C5A60S2 chips, display principle Principle 32 * 64LED dot matrix screen, use 74LS595 and 74LS164's. The system is simple, easy to use, you can use STC12C5A60S2 SCM data processing functions of the sound signal spectrum analysis.
Automated Judgment for Chin-Up Exercises Based on Microsoft Kinect Image System
Authors: Zhao Su Fang , Luo Bing
Published: June 2014

Chin-up physical exercises need to be judged regular or foul and counted, the work can be automated finished by computer based on image recognition accurately and objectively. There are two difficulties in this automated system: one is to judge whether chin has been above the bar, the other is to determine whether chin-up arms have moment unbent state during sagging. This paper proposed judging chin above bar by Microsoft Kinect depth image and determining arm unbending by skeletal tracking. Depth image can help image segmentation, and skeletal tracking can position key points of arms. Experimental results showed that the approach could automate judge chin-up rapidly, accurately and practically.
Human Behavior Recognition Based on Motion Decomposition
Authors: Zhu Shao Ping , Chen Yu Hua
Published: June 2014

Human behavior recognition is an active research field in computer vision and image processing. A novel method is proposed for human behavior recognition in video image sequences. First of all, a video sequence is represented by extracting space-time interest points. Then Human behavior is represented by activities through Motion Decomposition. The activity comprises labeled bags that are composed of unlabeled instances comprising to action. Final labeled activities are used to train a strong classifier which is used to predict the labels of unseen behavior bags. Experimental results show the effectiveness of the proposed method in comparison with other related works in the literature and can also tolerate noise and interference conditions.
Key Point Location and Segmentation Method of Automatic Diagnosis System Based on the Palm Images
Authors: Du Hong Wei , Xiong Kai , Liu Jing , Han Zhong Zhi
Published: June 2014

Using the method of image processing, some palm images are collected by scanner. Method of these images' key points' location and segmentation is researched. After proper preprocessing, images of palm's clear borderline can be acquired. A method of calculating distance derivative is used to mark the key points. Through experiments, it can be seen that the marking effect is good. The key points' marking method has positive significance to the development of automatic diagnostician.
A Robust Face Representation Method for Face Recognition
Authors: Li Zhao Kui
Published: June 2014

In this paper, a robust face representation method based on multiple gradient orientations for face recognition is proposed. We introduce multiple gradient orientations and compute multiple orientation images which display different spatial locality and orientation properties. Each orientation image is normalized using the “z-score” method, and all normalized vectors are concatenated into an augmented feature vector. The dimensionality of the augmented feature vector is reduced by linear discriminant analysis to yield a low-dimensional feature vector. Experimental results show that our method achieves state-of-the-art performance for difficult problems such as illumination and occlusion-robust face recognition.
Face Detection Based on the Theory of Fractal Compression
Authors: An Qing Sen , Chen Yue Bin , Fan Jing , Wang Jin Long
Published: June 2014

The face detection has been a very important issue, the use of local and global face similarity between faces can be detected. In this paper, based on fractal image compression theory, we construct a local iterated function systems as a description of the face to detect the face.
Image Capturing and Segmentation Method for Characters Marked on Hot Billets
Authors: Zhao Qi Jie , Cao Peng , Meng Qing Xu
Published: June 2014

Real-time detecting information marked on billets is important for automatically manufacturing and management in steelworks. But due to the tough production environments in steel enterprises, capturing and identifying characters marked on hot billets have many challenges. This paper presents a real-time image capturing and segmenting method with machine vision for characters marked on hot billets, and characters area is located based on color information of images. Furthermore, considering the marked characters are often slant, we proposed a kind of characters skew correction method to adjust the alignment of characters, and then segment characters into singles for recognition. Finally, with the proposed method, we have conducted some experiments in Baosteel Company. The result shows that our method can achieve 97% segmentation rate if we select proper image acquisition device and preprocessing algorithm. Additionally, it provides a new way for steel enterprise real-time capturing and segmenting marked characters image.
Research and Implementation of Real-Time Pedestrian Detection Algorithm
Authors: Xu Mei Hua , Zheng Huai Meng , Xia Chen Jun
Published: June 2014

Pedestrian detection has a broad application prospect in automotive assisting driving system, but the real time performance is very poor in most common used detection methods. This paper presents a fast algorithm to realize the real-time pedestrian detection. The Local Binary Patterns (LBP) is used to describe the local texture information with the feature of less calculation, the HOG classifier to extract a typical feature of pedestrian’s edge, and then SVM to train and classify on the databases of INRIA and MIT. While scanning the images, interest regions are extracted to speed up the detection. Series of experiment results shows that the proposed pedestrian detecting strategy is effective and efficient.
A Novel Vehicle Type Recognition Based on Template Matching
Authors: Li Tao , Li Dong Mei , Dou Yu Min
Published: June 2014

In order to improve the real-time performance and accuracy of the vehicle type recognition in real traffic scenes, a novel method of vehicle type recognition based on template matching is proposed. First, points are adopted with non-uniform sampling based on salient regions in contours of vehicle. Then, parallel template matching is introduced to realize the rapid vehicle type recognition through lookup tables. The results show that the algorithm can recognize vehicle type in traffic scenes efficiently.
People Counting Based on the Analysis of the Mass
Authors: Li Tao , Li Dong Mei , Huang Ren Jie , Zhao Xue Zhu
Published: June 2014

In order to improve the accuracy of people counting in video surveillance, the method for people counting based on the analysis of the mass is proposed. The novel algorithm of objects tracking is designed to aim at people counting, and the people counting model is obtained by training a support vector machine (SVM) classifier with the input of the feature of mass. The experimental results show that the accuracy of counting is over 93%.
Technology and Simulation of Image Enhancement Based on Wavelet Threshold
Authors: Lin Bai Lin
Published: June 2014

This paper has stated the theory of wavelet threshold denoising , combining the theory analysis and simulation results,the paper discusses several kinds of factors which affect the denoising capability in a complete denoising algorithm.That provides the date reference of threshold denoising methods in actual image process.
Rock Intelligent Recognition and Measurement of Particle Size
Authors: Luan Li Hua , Guo Lian Jun
Published: June 2014

The technique of wavelet transform is a good method for segmentation of complex image edge. This paper applied Two-B spline wavelet to identify the image edge and removed the false edges better. Based on edge detection,the system implemented the computing on rocks area and perimeter with Pixel statistics arithmetics.
Finite Element Analysis of Different Outlet Diameter on Fluidic Gyroscope Performance
Authors: Chen Jing Bo , Piao Lin Hua , Zhao Jing Jing , Ding Xia
Published: June 2014

In this paper, airflow of two different outlet diameters are analyzed contrastively of fluidic gyroscope. Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of gyroscope, meshing, loads applying and equation solving, and two dimensional airflow distribution of different outlet diameters in sensitive element are calculated. The results show that, velocity at the outlet Vsum=0.53872m/s which diameter of outlet d=3mm, and which is 35.9% of velocity of the inlet, airflow velocity in the outlet increases by 7.4% than d=4mm at the outlet. It accelerates velocity of fluidic beam without any vortex increases in sensitive cavity when d=3mm, and it also increases thermal wires temperature changes and improves the sensitivity of fluidic gyroscope.
Research of Characteristic Extraction Algorithm of Ballistic Missile Hyperspectral Databased on Horizontal Traversing Time
Authors: Liu Shi Hua , Sheng Wen , Zhang Xian Zhi
Published: June 2014

A characteristic extraction algorithm of the ballistic missile hyperspectral data based on the horizontal traversing time is studied. The ballistic missile hyperspectral data of imaging spectrometer based on near-space platform is generated by numerical method. The characteristic of the ballistic missile hyperspectral data is extracted using the characteristic extraction algorithm based on the horizontal traversing time. The simulation result show that the characteristic extraction algorithm is easy to implement and low complexity. The characteristic, which extracted by this algorithm, is enough to represent the speciality of the ballistic missile hyperspectral data. The characteristic is not sensitive to disturbed signal and improve the timeliness of the following object matching and recognition.
The Simulation and Design of a Kind of Fitness Ball Testing Machine
Authors: Tong Bo , Yin Yan Chao , Wu Lei
Published: June 2014

Due to the growing demand for fitness ball in current domestic market, and the demand for different size ball is also on the rise. In this paper, a kind of fitness testing institution has been proposed in this paper. The preliminary design and modeling of the agency were conducted in the Solidworks. In order to validate the correctness of the model design, the motion simulation was proceed by the Adamas. From the data obtained by the simulation, we can know the functions of the machine, which can provide data support for the subsequent design.
Design of the Monitoring System for Valuable Chinese Herbal Medicine Growth Based on CC2430
Authors: Zhu Bi Hua , Zhu Da Qing , Zhu Ying Li
Published: June 2014

Due to lots of the precious Chinese herbal medicines are on the edge of exhaustion, the paper presents a real-time monitoring system based wireless sensor network in order to protect Chinese herbal medicines and do artificial cultivation. Temperature, humidity and light condition is very important to the growth of Chinese herbal medicines growth. How to scientifically adjust the environment parameters is essential, it’s benefit for Chinese herbal medicines to improve the yield and quality. According to herbal medicines environmental characteristics, sensor networks were designed which the data can be accurately collected so as to track and monitor environmental factors of grow influence in real time or continuous. The system gives the hardware design of wireless sensor node and software implementations. Wireless sensor network nodes communication circuit was designed by CC2430, monitor environmental parameters with air temperature and humidity sensors and light intensity sensors. Experimental results show: the sensor network monitoring system can make the artificial cultivation of the medicines more modern, scientific and objective.
Information Fusion and Application of Fiber-Capacitive Sensor
Authors: Song Qing , Meng Gao Jie , Yang Lu , Du Dan Qing , Mao Xue Fei
Published: June 2014

Droplet analysis technology is very important in the field of liquid detection. Optical fiber method is comparatively mature, but it is susceptible to the fluid velocity, volatility and other uncertain factors. Capacitive method is easy to be influenced by the environmental temperature. Above condition limit the practicability of droplet sensor to some extent. The multi-sensor information fusion technology is put forward in this paper to combine the optical fiber method and the capacitive method. The fiber-capacitive droplet sensor is especially designed, so that the data acquired from different sensors are integrated and complementary. Experimental results show that the reproducibility of the measurement and the comparability of the liquid drop fingerprints among different samples are improved.
Research on Signal Detection Method of High Precision Based on Bayesian Fusion of Multisensory System
Authors: Chen Cheng , Wang Hong Hua
Published: June 2014

Faced
to low detection rate
and low credibility of single sensor
because of noise
, this paper proposes Bayesian fusion based on multisensory system, whose detec
tion rate and credibility are discussed.
After simulation
,
it is concluded that
the Bayesian fusion
is a
feasible
detection method
with
high precision
that
improves detection rate and credibility.
Analysis of Force Transducer Calibration Accuracy Based on Different Influence Factors
Authors: Zhao Yan Zhi , Li Gui Tao , Niu Zhi , Weng Da Cheng
Published: June 2014

The actual use conditions of force transducer is differences between the factory verification conditions, so based on the structure and working principles, this article is aimed at accurate calibration and proper use of force transducer. Through the CAE simulations and calibration experiments in actual working conditions which are the installation pre-tightening force, structure of fittings and pedestal’s hardness, analyses the output signals of force transducer. Force standard machine was carried out on the calibration experiment to verify the correctness of the numerical simulation. And then the outcomes obtained by numerical simulations and the calibration experiments, it studies the differences of every output performance index of force transducers in different working conditions above-mentioned.
Classification Moving Vehicle Based on Multisensor Data Using Fusion of Multi-Class SVMs Methods
Authors: Chen Xiao Yun , Chen Xian Fu , Zhang Shao Quan , Zhang Wen Bin
Published: June 2014

In this paper, we propose a special Multi-class SVMs (MSVM) data fusion strategy which is applied to classify vehicle based on multiple pavement structural strain time histories. The centralized and distributed fusion strategies are applied to combine information from several data sources. In the centralized strategy, all information from several data sources is centralized and combined to construct an input space. Then a MSVM classifier is trained. In distributed schemes, the individual data sources are processed separately and modeled by using the MSVM. Then new data fusion strategies are used to combine the information from the individual MSVM to acquire the final classification outputs. Two popular Multi-class SVMs algorithms (One-against-all OAA, One-against-one OAO) are used to construct classifier based on aforementioned two fusion strategies, respectively. The results are compared between SVM-based fusion approach and single data source SVM using two MSVM algorithms, respectively. The result shows this SVM-based fusion approach significantly improves the results of classification accuracy and robustness. The proposed Multisensor data fusion methods can also be applied in other fields.
Design of the Chemical Reaction Tank Temperature Acquisition System Based on Wireless Sensor Networks
Authors: Wang Ming Wei , Yao Zhan , Guo Wen Qiang , Li Qiang Hua , Li Qin Jun
Published: June 2014

In the chemical industry, it is necessary to detect the chemical reaction temperature in the tank online and real-time to ensure the chemical reactions normally and prevent accidents. A chemical reaction tank temperature acquisition system based on ZigBee technology is proposed. The hardware and software architecture of the new designed system is described in details in this paper. The new designed system overcomes the disadvantages of manual detection or wired method. The field experiments show that the system has the advantages of high precision, flexibility, anti-interference, real-time, and Multi-point, etc.
Evaluation of Optoelectronic Performance of Four Organic Photo Detectors Structures
Authors: Wang Li , Niu Qun Feng , Camacho Javier Soriano , Dong Tao
Published: June 2014

Organic photosensor made of poly [N-9′′-heptadecanyl-2,7-carbazole-alt-5,5-(4′, 7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) are promising candidates for bio-sensing applications. This paper investigates the optoelectronic characteristics of 4 different structures through simulation, utilizing PCDTBT as the active absorption layer. The scheme 1 is formed by placing the PCDTBT layer on top of a SiO2layer, and then interdigitated electrodes made of aluminium are placed onto PCDTBT. As to the scheme 2, the semiconductor layer is placed between an aluminium layer (bottom) and glass (top) layer coated with thick transparent interdigitated electrodes made of indium tin oxide (ITO). Regarding to scheme 3, layers from bottom to top are SiO2, cathode, PCDTBT and anode. Cathode has the same area as SiO2and PCDTBT layers, but anode covers only partial of the semiconductor. Finally, in the scheme 4, the semiconductor layer is also placed over SiO2layer but here the anode and cathode are limiting the PCDTBT layer sides, having the same area for both sides. All schemes have same volume of semiconductor. The simulations have been realized in dark conditions and under light intensities 100 mW/cm2in the wavelength range of 400-550 nm. The best results were obtained for scheme 2, organic photoconductor with Metal-Semiconductor-Metal structure. For in this scheme which is under the conditions of 2 V bias, 500 nm wavelength and 100 mW/cm2illumination, the photocurrent, the internal and external quantum efficiency obtained were 8.53 μA, 88% and 45% respectively. As a conclusion, the scheme 2 Glass/PCDTBT/Aluminium with transparent electrodes has reached high performance desirable for bio-sensing.
Frequency Characteristics Analysis of High Frequency Current Transformers
Authors: Dong Yue , Chen Xiao Xin , Li Yan Ran , Zhang Yi Ming , Wei Chong
Published: June 2014

In this paper, the equivalent model of high frequency current transformers (HFCT) for partial discharge online monitoring and its major parameters’ influence on amplitude-and phase frequency characteristics are derived. An optimized design for HFCT for partial discharge online monitoring is summarized.
The Application of Oxygen Indicator in Food Packaging
Authors: Xie Si Yuan , Liu Xing Hai , Li Hou Bin , Huang Chi
Published: June 2014

Oxygen indicator can monitor the quality and safety of the food that transport from producers to consumers by perceiving the oxygen concentration in packaging, and then inform the consumer about the product’s safety, shelf life and availability by sensing the visually physical change, which will widely used for modified atmosphere packaging in food packaging.
The Measuring Machine Designing for Detection Iron Tower Component
Authors: Li Wei , Liu Jin Gang , Pan Chun Xiang , Qin Lin Jing
Published: June 2014

In this paper, iron tower component is taken as measuring object, online automatic detection is aimed to achieve, and the system frame is constructed to carry out electro-optic automatic detection of the iron tower component, then designing of large size examination machine will be accomplished, which will set up the foundation of theory and the technology for large size examination machine development.
A Novel Harmonic Detection Method Based on Wavelet Analysis
Authors: Wu Lei , Gao Ya Zhou
Published: June 2014

Active power filter (APF) is a new power electronic device used for reactive power compensation and dynamic harmonic suppression. Its performance depends on the highly precise detection of harmonic and reactive current. In view of the low pass filters defection in traditional ip-iq method, this paper proposes a wavelet filter based on wavelet analysis. This algorithm could attain higher detection precision with lower cost. The simulate results illustrate the efficiency and accuracy of it.
Application of the OPC Technology in the No-Load Test Platform of the Metro Bogie
Authors: Ren Guang Sheng , Gai Lei , Yin Xiao Qing
Published: June 2014

The generation of the OPC technology makes each data source communicate flexibly in the industrial control environment. This paper takes the no-load test platform of the metro bogie as an example to design a lower and upper computer measurement and control system which is consist of IPC and PLC by the OPC technology. The OPC client is developed based on the platform of Visual Basic. By using the different communication mode, it is realized to access the OPC server data.
Accuracy Analysis of Point Cloud Registration Based on Mark Point
Authors: Liang Xin He , Liu Jian Wei
Published: June 2014

When optical 3D shape measurement equipment works, they gather dense point cloud using mark points as artificial feature for the purpose of global registration; as a result, rough registration error of multiple scans depends primarily on the location accuracy of these mark points. This paper analyses the 3D measuring error distribution law of the mark points in difference direction, proposes that the measurement error in z direction varies as positive proportion with z square, and inversely proportion with distance between two cameras.
Research on Ranging Method Based on Binocular Stereo Vision
Authors: Lv Xue Zhi , Wang Mei Ting , Qi Yong Feng , Zhao Xue Mei , Dong Hao
Published: June 2014

Binocular stereo vision ranging method taking contour boundary center of measurement object as matching features was investigated. And experimental platform for binocular stereo vision ranging system was built up. The stereo vision ranging system comprised four modules: camera calibration, stereo calibration, stereo rectification and features extraction. Firstly, the intrinsic parameters of single camera were obtained by camera calibration and relative pose of two cameras was obtained by stereo calibration. Then the left and right images were rectified into a frontal parallel arrangement by Bouguet’s method. The edge pixels of contours were detected by image processing. Then the disparity and the distance was calculated taking contour center as matching features. Finally, measurement error analysis was performed to verify the proposed method with good practicability.
Research of Armored Anti-Riot Vehicles Repair Based on Virtual Maintenance Technology
Authors: Zhan Ren Jun , Ma Chao Zu , Wang Song
Published: June 2014

Virtual maintenance technology is a major innovation in the equipment maintenance field in recent years, the armored anti-riot vehicles play a vital role in the tasks of the duty, conflict, terrorism of the armed police force. In order to apply the virtual maintenance technology in armored anti-riot vehicles better, the article introduced the virtual maintenance technology and its key technologies, and gave the importance of virtual maintenance technology. It established the virtual maintenance process model of armored anti-riot vehicles. At last, it gave the prospect of the technology and made some suggestions.
Improvement of Waveform Analysis Method Based on Polynomial Fitting for Liquid Drop Fingerprint
Authors: Song Qing , Du Dan Qing , Yang Lu , Meng Gao Jie , Mao Xue Fei
Published: June 2014

Waveform analysis method is widely used for feature extraction of liquid drop fingerprint, but it is easily affected by noise. To solve this problem, waveform fitting and analysis method based on polynomial fitting is proposed, though which the waveform of liquid drop fingerprint is fitted to be a smooth curve. Experimental results show that waveform fitting and analysis method is able to reduce the standard deviation and maximum difference of eigenvectors from the same kinds of liquid, and thus increase the recognition accuracy rate of 10 kinds of water based on BP neural network from 86.5% to 100%.
Mathematical Model and Simulation for Testing Aspheric Surface Using the Digital Moiré Patterns by Circular Sub-Region Stitching Method
Authors: Man Yu Chun , Zhou Chun Yuan
Published: June 2014

sub-region stitching measurement of asphere by using the combination of digital moire patterns without compensator, auxiliary mirror and other assistant modules. This paper illustrated the principal theory. And use of digital filtering, phase shifting, the least square method and Zernike polynomial fitting to establish the reasonable mathematical model. Meanwhile the computer simulation experiment was carried on. the PV and RMS of the full aperture phase distribution residual error are 0.058λand 0.0087λ After this method processing.
Research on Side Detector by the Finite Element Modeling
Authors: Zhao Xiu Hua , Meng Chun Ling , Li Yang , Liang Tao
Published: June 2014

It has prove to be the essential means to improve the efficiency, shorten the cycle and reduce costs of development by finite element modeling and simulation on side detector.Finite element modeling was studied for the design of profile detector on the basis of theoretical analysis.Verify the validity and reliability of the model combining with the test results,thereby providing the basis for further optimization of product design.
Design of Intelligent Dynamic Weighing Instrument Based on AT89S52
Authors: Sun Zhen Ya
Published: June 2014

This paper describes intelligent dynamic weighing instruments based on AT89S52 , using learning algorithm to replace the traditional debugging methods, due to weighing instruments can accomplish the weighing process at the fastest speed and the highest precision.
Research of pH Value Temperature Compensation Module Based on the Least Squares Method
Authors: Zhao Xue Liang , Shi Yun , Li Kang , Wei Guang Hua
Published: June 2014

The high precise pH automatic monitoring measurement is designed based on MSC1210 MCU and pH sensor. To eliminate the effect of temperature on the measurement results, a pH value temperature compensation module is established using the least Squares Method to analyze the linear relationship between pH and voltage. The results show that, the automatic monitoring measurement possesses broad application prospects with the advantages of ultra-low power consumption, good stability and high precision.
Research on Measuring Key Errors of Plane-Generated Enveloping Hourglass Worm
Authors: Lu Hong , Liu Zhi
Published: June 2014

Plane-generated double enveloping hourglass worm pair has unique characteristics of double contact line; it has the advantages of wide tooth working area, large bearing capacity, and long service life, etc. However, its development has been restricted by such factors as difficulty in measuring, worse processing precision, etc. In this article, a modeling approach is presented in order to obtain the meshing point’s coordinates of the plane–generated enveloping hourglass worm based on theoretic analysis and computer-aided design principle. And a measuring equipment system is designed to measure the meshing point’s coordinates. Key errors of this worm have been discussed and obtained by comparing the theoretic coordinates and the measuring coordinates. Finally, an experimental study has been carried out to validate the modeling method and measuring equipment system.
Fast Calculation Method for the Magnetic Field of Coil above Conductive Plate
Authors: Zhang Si Quan , Qi Chuan , Chen Gang
Published: June 2014

A series expansion calculation model was proposed to compute the change of magnetic induction intensity at the coil center above a conductive plate, based on the Maxwell equations, the magnetic vector potential and solution region truncation. When the truncated solution region radius and the summation terms are chosen properly, the computation time can be reduced considerably and preserve the computational accuracy. The model was compared with finite element method and the results agreed very well, and it confirms the suitability of the proposed model and its application prospect in electromagnetic non-destructive testing.
Redundant Method for Measuring Downhole Posture of the Steering Drilling Tool
Authors: Liu Zi Li , Yan Wei Sheng , Xiao Wei Wei
Published: June 2014

Exact downhole posture measurement of steering drilling tool can provide reliable control parameters for downhole control system, so as to ensure the accurate control of hole trajectory. How to ensure the reliability of the posture measurement system while it works in harsh environment is a key technique in the engineering process of steering drilling system. A redundant measurement method based on multi-accelerometers has been put forward according to the analysis of the working environment and measurement reliability requirements of posture measurement system. Then the posture parameter solution formulas were given. According to the linear relationship between measurement signals, a reconfiguration method of the redundant measurement system was put forward to ensure the fault-tolerant operation of the system.
Study on the Reconstruction and Microscopic Contact of Engineering Surfaces
Authors: Wang Qing Li , Li Pei Lin , Wang Wei , Liu Xiao Wei
Published: June 2014

Aiming at the existence problems of surface fitting on the current surface measurement method of digital characterization of engineering surfaces, the Pro/E software is used to envelope processing on measured data which is reduced noise and volume, and formed of small plane characteristics. Then the small plane is fitted based on bi-cubicB-spline algorithm and generated entity. A finite elements contact model of engineering surface and the rigid plane is established. And then the relationship of real contact area with the change of load with different material parameters is proposed. Generally, comparison between computed and previous studies’ results showed good agreement, which lays a foundation for the next step of study on the influence of the repair assembly performance upon mechanical joint surfaces and has a certain engineering significance.
Applications of Optical Fiber Access Network
Authors: Liu Bao Ming , Zhou Li
Published: June 2014

This article introduces the basic concepts of optical access network, technical characteristics, the next type of optical access network applications, business support capabilities, configuration, structure, selection of future development trends of the optical access network.
Optical System in Laser Inter-Satellites Communication
Authors: Zhou Li
Published: June 2014

We know that Inter-satellites communica-tion is a very important to us.However, real global coverage can only be achieved by satellite systems. Satellites communication is the most important mean of the communication network. The traditional satellites communication and inter-satellites links are built by microwave. Recent years, laser links for inter-satellites communication are becoming more and more important.
Research on the AFEC Algorithm of Active Network in Wireless Environment
Authors: Shang Qi Xing
Published: June 2014

Since fixed Forward Error Correction cannot show a better performance in solving error problems for transmission in wireless network, this paper proposed an AFEC strategy in active network. Simulation and analysis prove that it can not only prompt the redundancy that change adaptively with the network condition, but also not rely on the constancy of the network environment any more and enhance the adaptability and robustness of the FEC algorithm, so that more adapt to the changing wireless environment.
Decoding Algorithm of Circular-Pipes Packing in Multi-Pipe Intersecting Structures
Authors: Huang Shi You , Xu Lei , Ye Zhen Zhen
Published: June 2014

The port section intersecting lines of circular-pipes are complicated space curves in multi-pipe intersecting structures, which makes it is difficult to treat circular-pipes for packing pipe precisely by traditional algorithm. A new decoding algorithm is proposed by dividing and translating points of intersecting lines in pipes’ port sections and calculating the least surrounding boxes of them. Encoding and decoding method and evaluation mode of fitness function are given. And responding packing module based on this decoding algorithm is developed in AutoCAD. It demonstrates that using the decoding algorithm can improve the utilization rate of materials and make programming efficient and easy.
Optimization of Vehicle-Borne Radar Antenna Pedestal Based on Modified NSGA-II
Authors: Zhao De Gao , Li Qiang
Published: June 2014

This paper deals with application of Non-dominated Sorting Genetic Algorithm with elitism (NSGA-II) to solve multi-objective optimization problems of designing a vehicle-borne radar antenna pedestal. Five technical improvements are proposed due to the disadvantages of NSGA-II. They are as follow: (1) presenting a new method to calculate the fitness of individuals in population; (2) renewing the definition of crowding distance; (3) introducing a threshold for choosing elitist; (4) reducing some redundant sorting process; (5) developing a self-adaptive arithmetic cross and mutation probability. The modified algorithm can lead to better population diversity than the original NSGA-II. Simulation results prove rationality and validity of the modified NSGA-II. A uniformly distributed Pareto front can be obtained by using the modified NSGA-II. Finally, a multi-objective problem of designing a vehicle-borne radar antenna pedestal is settled with the modified algorithm.
Research on Blackout Measurement and Communication of Reentry Vehicle
Authors: Zhang Yong Liang , Qu Yuan Xin , Liu Xiao Chun , Cong Bo
Published: June 2014

For measurement and communication interrupt between earth station and reentry vehicle in blackout area, we analyze electromagnetic environment characteristic of plasma sheath. Methods of changing electrical characteristic of plasma medium or changing measurement and communication equipments are researched based on the analysis. Also technology of trajectory reconstruction is presented by using limited measurement data of target. The paper introduces technology status of measurement and communication for blackout area reentry vehicle. Also we analyze properties of common methods and propose key questions to research. It provides reference for related researchers.
Performance Analysis of AF Relaying Systems with Partial Relay Selection
Authors: Zhang Hong , Hao Dong Lai , Ding Hai Yang
Published: June 2014

In this Letter, assuming a Nakagami-m fading scenario, closed-form asymptotic expressions for the average symbol error probability (ASEP) of dual-hop amplify-and-forward (AF) cooperative systems with partial relay selection are derived. Based on these expressions, the diversity order is obtained and insightful conclusions are drawn. Numerical results are plotted and the asymptotic curves match very well in the medium and high signal-to-noise ratio (SNR) regions with those obtained by simulations.
Simulation of a Characteristics Identification Algorithm
Authors: Yang Wen Chuan , Li Rui , Shang Zhi Dong
Published: June 2014

Keystroke rhythm identification, which extracts biometric characteristics through keyboards without additional expensive devices, is a kind of biometric identification technology. The paper proposes a dynamic identity authentication model based on the improved keystroke rhythm algorithm in Rick Joyce model and implement this model in a mobile phone system. The experimental results show that comparing with the original model, the false alarm rate of the improved model decreases a lot in the mobile phone system, and its growth of imposter pass rate is slower than the Rick Joyce models. The improved model is more suitable for small memory systems, and it has better performance in security and dynamic adaptation. This improved model has good application value.