bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Stepper Motor Control System Based on SOPC and LabVIEW
Authors: Duan Xin Wen , Sun Hao
Published: July 2014

This thesis proposes a design of digital stepper motor control system, with FPGA as control core, communicates with LabVIEW host computer system via RS232 serial port. The host computer control system is programmed in LabVIEW, and can be used to choose working mode, rotation direction, run or stop, steps and angles for rotation. The slave computer system takes EP2C8Q208C8N chip of Altera Corporation’s Cyclone II series as the core, to construct the hardware environment of the system. And it could driver stepper motor correspondingly according to the received commands that sent by host computer. This design provides a new idea for development and application of embedded system, and has a certain reference value for the development of new product.
Mobile Robot Path Planning Based on Artificial Potential Field Method
Authors: Zhang Bao Feng , Wang Ya Chun , Zhang Xiao Ling
Published: July 2014

Various combination optimization algorithms have been designed to solve the problem of robot path planning, but every algorithm has some limitation. The artificial potential field method has superiorities in positive feedback, flexibility and collaboration, which convert it into adapt to the trend of path planning algorithms in the intelligent and bionic direction. Artificial potential field method is advanced in the environment of static grid in this paper. Then the feasibility and practicability of the algorithm are backed by a simulation experiment.
Simulation Research of Asynchronous Motor Direct Torque Control System Based on MATLAB
Authors: Li Guo Hong , Li Yi
Published: July 2014

Compared with vector control, direct torque control (DTC) spurned coupling idea and canceled circumgyration coordinates transform. By detecting motor’s stator voltage and current, along with calculating motor’s flux and torque in virtue of the instantaneous space vector theory, DTC controlled flux and torque directly according to the difference between the detecting value and design value. DTC also reduced calculation amount and overcomed the flaw that the system was disturbed by motor’s parameters easily, which were the problems in the vector control. On the basis approach mentioned above, this paper realized the system simulation using DTC. Simulation shows that asynchronous motor control has favorable ability of speed adjusting, short startup time, excellent stability.
Wind and Electricity Supplementary Actuation Desalination Control System Research
Authors: Ma Chang Xuan , Sun Zhen Ping
Published: July 2014

This article is the windward electricity supplementary actuation desalination control system conducts the research, With the wind directly driven desalination high pressure pump, Complemented by electricity network as a supplementary, When the wind is great, Also may the back coupling electrical network, This system according to the amount of water desalination successively calculated, design, Select vertical-axis wind turbine impeller, the transmission system, desalination system and control system, final Assembly and test.
Research and Improvement of the Step Tracking Technology in the Vehicle On-the-Move System
Authors: Zhang Xiao Dong , Wang Yu
Published: July 2014

In order to improve the performance of the existing On-The-Move system, this paper studied a kind of step tracking technology based on the traditional algorithm. For the contradictions between the capture speed and precision performance on the initial acquisition, re-acquisition and auto tracking and controlling algorithm, this technology improved the initial acquisition stage. In the initial acquisition stage, the beacon AGC is distinguished. When the beacon AGC is below the specific threshold, there is a uniform rotation in the azimuth direction. When the AGC is above the threshold, the system turns to the step tracking stage based on variable step algorithm. Research showed that this technology has faster acquisition speed and higher tracking accuracy, maintains low computational complexity, and improves the system performance.
Research on Technology of On-Line Detection on Key Part of the Deep Sea Oil Facility
Authors: Zhang Hai Tao , Li Wei , Guo Xing Wei , Zhao Lei , Zhang Yu Kun , Zhang Qing
Published: July 2014

The key part of the deep sea product system has high demand for the detecting system. The paper makes deep research in extracting the detection feature information of the facilities, path planning, data processing. Improve the detecting efficiency and the detecting precision.
Hydraulic System Fault Diagnosis Method Based on HPSO AND WP-EE
Authors: You Zhang Ping , Ye Xiao Ping , Zhang Wen Hui
Published: July 2014

A fault diagnosis approach of hydraulic system based on Hybrid Particle Swarm Optimization (HPSO) algorithm and Wavelet Packet Energy Entropy (WP-EE) is presented. A heuristic algorithm is adopted to give a transition from particle swarm search to gradient descending search. A HPSO algorithm is formed with the heuristic algorithm, which is used to optimize BP neural network weights and threshold. Then an application of fault diagnosis with HPSO and WP-EE based on a valve-controlled hydraulic motor system is presented. After wavelet packet decomposition of the acquired hydraulic pressure signal, the WP-EE is extracted; the eigenvector of wavelet packet is constructed. Taking this eigenvector as fault sample, the neural network based on HPSO algorithm is trained to implement the fault diagnosis for the hydraulic system. The test result shows that the fault recognition accuracy and the efficiency in the hydraulic system are improved by this method.
LQR Based Trajectory Tracking Control for Forked AGV
Authors: Li Yang , Wang Xiao Nian , Li Si Jun , Zhu Jin
Published: July 2014

This paper concerns trajectory tracking control of AGV. The model of forked AGV was simplified from a three-wheeled vehicle model to a “bicycle” model. The dynamic model of vehicle lateral motion was built depending on Newtown’s second law and the analysis of lateral tire forces. The optimal control linear quadratic regulator was applied to achieve trajectory tracking control. Use the MATLAB and CarSim to simulate. The satisfied results proved that the control algorithm was effective and could make the system stable.
A Key Strategy for Controlling the High-Power Photovoltaic Inverter
Authors: Zhou Jing Hua , Cui An Wei , Zhang Xiao Wei
Published: July 2014

In this paper, a systematic control strategy has been proposed for specific problems with the various key performance indicators of the high-power photovoltaic (PV) inverter when it connects to the grid. it proposes fast and accurate variable-step-size perturbation and observation combined with power prediction as a Maximum Power Point Tracking-based (MPPT) control strategy. To meet the requirements for low voltage ride through (LVRT), it proposes a strategy for LVRT control. It adopts an active method used for anti-islanding detection of reactive power disturbance so as to realize anti-islanding detection quickly. Finally, it carries out testing on the control strategy by means of an experimental platform with a 500 kW PV inverter to prove the effectiveness of the proposed control strategy.
An Improved Electromagnetic Band Gap Structure for Overcoming the Simultaneous Switching Noise
Authors: Wang Yue , Yang Shu Hui , Geng Peng , Chen Ying Chao
Published: July 2014

In order to decrease the signal integrity problems caused by Simultaneous Switching Noise (SSN) in the high speed circuit, it has designed an improved planar electromagnetic band-gap (EBG) structure, which based on metamaterials. We want to model and simulate the stop-band characteristics by using the electromagnetic simulation software HFSS. The results show that, compared with the traditional UC-EBG structure, when the inhibition of depth is-30 dB, the bandwidth of this new type EBG of inhibition is 3.7 GHz, the upper cut-off frequency is 4.7 GHz, the lower cut-off frequency is 1 GHz, relative bandwidth is 130%.Compared with the traditional UC-EBG structure relative bandwidth increase 15%.
Full Power Experiment Method of Single-Phase PWM Back-to-Back Converter
Authors: Zhou Jing Hua , Zeng Peng , Zhang Xiao Wei
Published: July 2014

Based on the single-phase H-H power unit topology in the novel co-phase power supply system, with the back-to-back grid-connected operation method, this paper aimed at solving the problem that in experiment, system capacity constraints caused the failure to achieve unit full power output and proposed the strategy of rectifier voltage, current double closed loop and full disturbance feed-forward control. Finally, based on the digital signal processor (DSP) and complex programmable logic device (CPLD), this study constructed a hardware platform of the power unit control system. Experimental results show that the system is stable, achieving two-way flow of energy.
Research on the SVPWM Technology Used in PMSM Speed Regulation System
Authors: Meng Ting , Wang Yu
Published: July 2014

Principle of space vector PWM was established, modulation function of load phase voltages were computed, correlation between space vector PWM and sinusoidal PWM methods was reexamined in this paper. Theory and simulation results shows SVPWM has an advantage of higher utilization of DC voltage, lower torque ripple and so on in PMSM speed regulation system.
Partial Discharge Pattern Recognition for Cast Resin Current Transformer Using Fuzzy Neural Network
Authors: Chang Wen Yeau
Published: July 2014

This paper proposes a pattern recognition approach based on the fuzzy neural network for identifying insulation defects of cast resin current transformer (CRCT) arising from partial discharge (PD). Pattern recognition of PD is used for identifying defects causing the PD, such as internal discharge, external discharge, corona, etc. This information is vital for estimating the harmfulness of the discharge in the insulation. The PD patterns are collected by a PD detecting system in the laboratory. Several statistical methods are used on the phase related distributions in this paper to extract the features for recognition. A set of features, used as operators, for each PD pattern is extracted through statistical methods. To verify the proposed approach, experiments were conducted to demonstrate the field-test PD pattern recognition of CRCT models with artificial defects are purposely created to produce the common PD activities of insulators by using feature vectors of field-test PD patterns. The experimental data are found to be in close agreement with the recognized data. The test results show that the proposed approach may achieve quite satisfactory recognition of PD patterns.
Diagnostic Analysis of Boiler Make-Up Water Treatment System in Taishan Power Plant
Authors: Zhao Jun Ming , Liu Sen , Li Mao Dong , Yang Bo , Chen Ying Tong , Guo Si Xue , Zhu Zhi Ping
Published: July 2014

The boiler make-up water pretreatment system and desalination system of 2×1000MW units in Taishan power plant were investigated and analyzed,and their corrosion risk were assessed . The results showed that the change of seasons had no effect on the dosage of coagulate in boiler make-up water pretreatment system and the system had advantages of economic operation, simple maintenance, however, corrosion risk might exist in equipment; for desalination system, carbon remover could be omitted and it had a large cycle water production, and the water quality of the mixed bed is good, however, the effect of iron removal and high efficiency filter backwashing is poor, In addition, corrosion existed in both acid and alkali regeneration system as well as in drainage system, steam turbine and effluent treatment equipment.
Profile Loss Correlations for Variable Incidences
Authors: Yuan Zhen Wei , Zhang Jun , Zhu Dong Shuai
Published: July 2014

Profile loss is a main part of cascade aerodynamic losses in all breakdown schemes. In previous literature, the well known and mostly accepted correlations for profile loss should be the Kacker and Okapuu design-point and the Benner et al. off-design correlations. However, the two correlations had been devised separately with different form. The present paper is motivated to combine the two correlations to form a universal correlation for all operating conditions. By defining an incidence correction factor, a universal profile loss correlation for all operating conditions is developed. The effects of incidence on the midspan profile loss are examined through numerical simulations and analyses. Beneficial conclusions are obtained in the end.
Low Cost Solar Tracker with High Efficiency in PV Generating System
Authors: Tang Min , Wang Jing , Yang Jin Ming
Published: July 2014

This paper describes a low cost solar tracker with high efficiency in PV generating system. The detecting device adopts two ultraviolet (UV) sensors to detect the sun’s position. The output of detecting device is a series of combination signals. And this output signal is directly used to control DC motor’s deflection to sun. No microcontroller is adopted in this design. The simple structure makes this solar tracker reliable and easy implementation.
Investigation of Signal on Transmission Lines in Power System
Authors: Li Hui , Yuan Liang
Published: July 2014

Single of phasor measurement unit (PMU) in smart grid is analyzed. On the power transmission links, single of voltage and current are measured by kinds of PMUs, messages of PMUs are concentrated to PDC (Phasor data concentrator) and super PDC in power systems. Signal quality is important to power transmission, power utilization and power control for stability a power system. Harmonics, inter-harmonics, decaying DC (direct current) offset, and additive white Gaussian noise are analyzed. Odd-number harmonics and inter-harmonics affect the quality of power signals. Decaying DC offsert components influence current signal of power transmission line whose model is modeled by EMTP (Electromagnetic transient program) worldwide. Noise is generally a negligible factor on power transmission lines, since signal-to-noise (SNR) is always below 40 dB.
Research of Low Voltage Distribution Grid’s Reliability
Authors: Tian Lei , Hong Yuan , Li Wen Yuan , Zhang Qing Feng
Published: July 2014

Management of power supply reliability is not only the quality management of equipment and power supply system, but also the safety management of equipment’s operation and power supply system’s maintenance. In order to analysis the reliability of 10kV distribution grid, on the one hand, this paper analyzed the structure characteristics of 10kV distribution grid and four kinds of wiring patterns, which were the main parts of 10kV distribution grid. On the other hand, it pointed out the reasons, which affected the distribution grid’s reliability and discussed the ways to improve the 10kV distribution grid’s reliability.
Preparation and Properties of MWCNTs/ PBO Membrane by Electrospinning
Authors: Hao Rong Rong , Jin Jun Hong , Yang Sheng Lin
Published: July 2014

Polybenzoxazole (PBO) fiber membranes with submicron-scale diameter were fabricated from the polyhydroxyamide (PHA) precursor by electrospinning and thermal cyclization processes. In order to improve the strength of the membrane MWCNTs was blended with PHA in the mixture solvent of dimethylacetamide (DMAc) and THF. The morphology, thermal stability, mechanical properties and dielectric constant of MWCNTs / PHA and MWCNTs / PBO membranes were characterized. For MWCNTs/PBO membranes, improved mechanical property and low dielectric constant could be achieved.
Design of Hardware of Smart Plant Growth Cabinet
Authors: Cui Shi Gang , Han Shao Long , Wu Xing Li , Liang Fan , Tian Li Guo
Published: July 2014

With the increase of nuclear radiation, soil pollution, water pollution and other man-made pollution, people are increasingly concerned about healthy eating. It gradually becomes a hot spot for scientists to develop a new green planting method. In this context, a design of smart plant growth cabinet based on LED lighting is put forward in this paper. From the analysis of social needs and the user′s analysis, transformation has been made from user requirement to the thinning mapping of product function and performance requirements. The main function and implementation principle of it and the design of the hardware are introduced in detail. This design has simple hardware structure, convenient maintenance, good stability, anti-interference ability and other characteristics. It has broad application prospect and great using value.
Design of Wireless Cage Culture Monitoring System Based on Remote Programme Update
Authors: Chen Dong Dong , Pan Hai Peng , Gu Min Ming , Wang Le
Published: July 2014

Cage culture is one of the major forms of aquaculture now. For ensuring the product quality, it is necessary that the status of water environment is estimated. Aiming at the issues of high cost and the difficulty of arrangement cables, intelligent remote monitoring system based on wireless communication technology is developing, and wireless remote program update technology is brought in for adapting to different aquatic products. The system has advantage of wiring easily and networking conveniently, and has wide market prospects.
Fights Behavior Detection Based on Space-Time Interest Points
Authors: Hu Jing , Qi Xiang , Chen Jian Feng
Published: July 2014

Human action recognition belongs to the senior visual analysis of computer vision, which involves image processing, artificial intelligence, pattern recognition and so on, is becoming one of the most hot research topic in recent years. In this paper, on the basis of comparative analysis and study towards current methods related to human action recognition, we propose a novel fights behavior detection method which is based on spatial-temporal interest point. Since most information of human action in video are indicated by the space-time interest points of video, we combine spatial-temporal features with motion energy image to describe information of video, and local spatial-temporal features are applied to extract fights behavior model by bags of words. Experimental results show that this method can achieve high accuracy and certain practical value.
The Research on Low-Orbit Space Debris Detection Range of Exoatmospheric IR Detector
Authors: Ji Yong , Zhou Tian Qi , Xu Zi Yan
Published: July 2014

Exoatmospheric IR detector is an effective means of space debris detection. In order to achieve the goal of an effective detection for low-orbit space debris, study the detection range for exoatmospheric IR detector. Studied the infrared detection technology, as well as the specific characteristics of the low-orbit space debris and other related aspects. First of all, introduce the method of detection process and determine the characteristic parameters of the space debris and infrared detectors. Then, calculate the space debris’ own infrared radiation energy and the background radiation energy. Then, by the infrared detector receives the photon number, refer to the engineering practice, the detecting range for exoatmospheric IR detector enhanced in evidence. The ground-based experiment demonstrates the calculation is preciseness and credibility. The space debris’ orbital height is 550KM and its size is 8m × 1.2m × 0.025m. Under such conditions, the detecting range for exoatmospheric IR detector is 48KM .This method can provide a certain referential significance for pace debris detection, imaging, and attacks.
The Catalyzed Synthesis of Prenyl Alcohol
Authors: Ruan Fu Xian , He Zhi Peng , Song Hong Lang , Huang Ke Lin , Hu Jing , Peng Xiao Yu , Yu Hui Qun , Liao Dan Kui , Sun Guo Song , Huang Shi Yong , Wei Zhi Ming
Published: July 2014

In this paper, the prenyl alcohol was catalyzed synthesized by using isoprene and dichloroacetic acid as raw material and sodium dichloroacetate as catalyst. The obtained product was mainly characterized by FT-IR and GC. Furthermore, the olefine acid ratio, reaction time, amount of catalyst, saponification time, NaOH concentration and distilled water consumption were systematically investigated during the work. The optimum reaction conditions were as follows: the olefine acid ratio was 1:2, reaction time was 2h, amount of catalyst was 1.5g, saponification time was 2h, NaOH concentration was 4mol/L and amount of distilled water was 0.2mL, the yield of prenyl alcohol was 26%
Simulation Study of Tuber Electrical Resistance Tomography System
Authors: Deng Xiang , Chen Lu , Dong Zhao , Liu Hao
Published: July 2014

The fast non-destructive inspection of plant tubers or roots is a big problem in the plant accurate cultivation. With the characteristic of non-invasion, low cost, no radiation and visualization, the electrical resistance tomography technology is applied to the research of agriculture field; therefore it can be used in the tuber growth status monitoring, new varieties nurturing and fine cultivation of plants. The main research contents include: establish the sensitive model and simulate by using COMSOL software; the affects brought by different positions and sizes of one tuber are studied in detail and the research of effects of tuber number on electrical properties is carried out. The research has crucial guidance for the further study of the TERT technology.
Polar Ocean Observation Buoys Seal Failure Research Based on ARMA Theory
Authors: Wang Shi Ming , Li Qing , Ren Zhun
Published: July 2014

Due to the special conditions of the Arctic climate, ocean observation buoys long-term work in harsh environments, such as seawater corrosion, temperature, pressure and other factors to buoy a higher sealing requirements, ocean snorkeling standard sealing system status monitoring and fault diagnosis mechanism analysis using autoregressive-moving average ARMA model for pressure measurement error problem buoy mathematical modeling can be applied to solve the pressure seal failure buoy measurement problems caused errors.
Co-Gasification Characteristic and Kinetic Analysis of Spent Mushroom Compost and Bituminous Coal
Authors: Wu Zhi Qiang , Wang Shu Zhong , Zhao Jun , Chen Lin , Meng Hai Yu
Published: July 2014

Co-gasification of biomass and coal is increasingly considered as a promising technology for sustainable utilization of coal and large-scale use of biomass. Co-gasification characteristic and kinetic analysis are the basic and essential information for the application of this technology. In this paper, co-gasification behavior of a typical bituminous coal from western China and spent mushroom compost (SMC) was investigated through thermogravimetric analyzer. The temperature interval was from ambient temperature to 1000 ○C with various heating rates (10, 20, 40 ○C•min-1) under carbon dioxide atmosphere. Kinetic parameter was solved through Distribution Activation Energy Model (DAEM). The results indicated that he maximum decomposition rates of the mixture and SMC were higher than that of coal except 25% SMC. Slightly synergistic effect during the co-gasification was found. The average values of the activation energy were 25.07 kJ•mol-1 for bituminous coal, 204.47 kJ•mol-1 for 25% SMC, 123.14 kJ•mol-1 for 50% SMC, 144.05 kJ•mol-1 for 75% SMC and 227.50 kJ•mol-1 for SMC, respectively.
Design of a High Resolution and Dual-Path Optical Water Turbidimeter
Authors: Fei Xia , Yao Jun , Li Wei , Xue Wei Qiang , Zhang Shao Hua
Published: July 2014

We have designed a high resolution and dule-path optical turbidimeter. The right angle scatted light turbidimeter is mainly for water in low turbidity levels, especially for drinking water. Mechanical design of the optoelectronic receiving room and the realizing circuit for modulation and demodulation are described in detail. To achieve good linearity in the measuring range from 0 to 5 NTU, pulse width modulation (PWM) and demodulation techniques are proposed, in this way, low temperature-drift and good anti-jamming ability can be obtained without the interference of background light. To improve the precision, the ratio algorithm which measures the ratio of the scattered light and reflected light is introduced in a dule-path optical system so that the interference of light emission can be eliminated effectively. Through the analysis and comparison of the experimental results, the linearity is improved by the ratio algorithm with a correlation coefficient for about 0.99932.
Research of Laser Method for Measuring One Type of Ammunition Assembly Angle
Authors: Xu Ai Guo , Jiang Zhi Bao , Jia Li Xin , Ming Zhao He
Published: July 2014

In order to meet the measuring performance requirement of both high accuracy and large range when measuring the large-scale space angle formed by non-uniplanar lines quantitatively based on the engineering background of ammunition assembly angle test, we propose a measurement method that uses line structured laser as a common measurement reference and combined with vision inspection technique to achieve the measurement of large-scale space angle formed by non-uniplanar axes. Ammunition assembly angle have been measured accurately by using this method which provides a scientific approach for quality evaluation of that type of ammunition.
The Field Experiments for Mixed Vehicle-Carrying Signals Acquisition Based on the Compact RIO
Authors: Zhang Yun Lei , Wu Xing , Pan Nan , Wang Xu
Published: July 2014

The usability and reliability of conventional vehicle carrying system is not always satisfy when customers were using it, bugs occur occasionally. To solve the problem, this paper presented a series of field experiment plan to find and modify bugs so that its stability and usability would be guarantee. This paper introduced from the sensor calibration, Static floor check, vibrate test, braking test, long trip test to signal analysis, the high reliability of vehicle carrying system based on Compactrio is proved.
A New Algorithm of Range and DOA Estimation of Near Field Sources Based on FLOS-ESPRIT
Authors: Wang Li Guo
Published: July 2014

A new algorithm based on fractional lower order statistics (FLOS) is presented to joint estimate the range and direction of arrival (DOA) parameters of near-field sources. The proposed algorithm adopts centra-symmetric uniform linear array, and constructs three fractional lower order statistics matrixes by the received array data, and utilizes TLS method to estimate the two dimension parameters, the algorithm has high estimation accuracy, only need a parameters pairing easily. The performance of proposed method is verified by computer simulations.
A Robust Hybrid HLLC-FORCE Scheme for Curing Numerical Shock Instability
Authors: Hu Li Jun , Yuan Li
Published: July 2014

HLLC is a monotonous high resolution scheme, which can capture shock, contact discontinuity and rarefaction wave accurately. But when we use it to calculate the multidimensional problem, the phenomenon of shock instability will appear near the strong shock. Compared with the HLLC, the FORCE scheme can present a good stability near the strong shock, and the dissipation is lower than HLL. This paper analyzes the stability of HLLC and FORCE, and proposes a hybrid scheme which can not only present good stability but also retain the high resolution of HLLC.
Analysis on High-Energy Physical Problems in Monte Carlo Simulation
Authors: Sun Bao Guang , Wang Xiao Feng
Published: July 2014

This paper analyzes the data got in two Monte Carlo simulations, namely, extensive air shower simulation and detector simulation. Then, based on the data from experimental arrays, some physical problems have been analyzed and illustrated. Those problems include the distribution of energy spectrum of secondary particles, the distribution of zenith angle, of azimuths, of background noises, and that of strip pattern, as well as the atmospheric absorption.
Auto Focusing in Digital Holography to Study Marine Microorganism
Authors: Tang Chun Ming , Liu Yu Cui
Published: July 2014

Auto-focus is an important technique for auto reconstruction of digital holograms, and works by focusing criterion function which influences the effect of the autofocus greatly. Aiming at Marine Microorganism holograms, this paper proposes a new focused criterion function established according to characteristics of detail discrete degree in reconstruction image changing with FD. Simulation results illustrate that, the proposed method, compared with several existing methods, has better single peak, higher sensibility and higher signal to noise ratio (SNR). The new method can realize autofocus of reconstruction distance to implement auto reconstruction of holograms.
Kalman Filter and Complementary Filter in Attitude Estimation of APM
Authors: Lin Feng , Miao Xi Lan , Qu Xiao Guang
Published: July 2014

This paper presents the results of a quaternion based extend Kalman filter (EKF) and complementary filter for ArduPilotMega (APM) attitude estimation. In addition, a new method to get the measurement noise covariance matrix R is proposed. Experimental results show that the two algorithms can meet the requirements, but the complementary filter can yield better performance than EKF.
Matlab-Based Formant Estimation
Authors: Luo Jiao Yan , Sun Xiang E
Published: July 2014

In the study of speech digital signal processing, the resonance peak is the major characteristics in reflecting track resonant. In order to be more conducive to the future development of speech signal processing techniques, three methods of the formant estimation are introduced in the article, namely, Short-time Fourier Transform method, Cepstrum, LPC estimation method. These methods are compared and analyzed by means of MATLAB programming, and it is concluded that LPC method is the best method, which can estimate the formant peaks more accurate.
The HIS_MSR Algorithm for Foggy Image Enhancement
Authors: Li Zhong Hai , Kou Xing Yuan , Cao Hong Yan , Man Xiang
Published: July 2014

In this paper, on the basis of the classical Retinex enhancement algorithm, we propose a MSR (Multi-Scale Retinex) algorithm based on HSI color space for foggy images enhancement. This algorithm can self-adaptively choose the Scale of the filter function, and it can automatically merge the enhancement effect of the multi-scales. The algorithm can highlight the detail characteristics of target while maintaining the background smoothly. In order to improve the brightness and contrast of the image, we use the Weber's law and the characteristics of human visual system to select the scale parameters, which can better realized the foggy images enhancement.
Sub-Optimum Detector Based on Reverbertion-Whiten in FrFT Field
Authors: Li Zhen Gang
Published: July 2014

Target detection in the presence of strong seabed reverberation is a hot research topic nowadays. This kind of target detection method is similar to signal detection with known shape and unknown parameters under non-WGN or coherent signal detection in reverberation. When a LFM signal is choose as transmitted signal, target echo has excellent time-frequency focusing property on a certain rotating angle and reverberation could lose its original linear modulation property. LFM signal can be transformed to a sine signal with some rank FrFT. Since FrFT is a linear transform, interference including reverberation and noise will keep former statistic characteristics. So LFM signal detection is thus equivalent to detection of sine signals in absence of colored noise. The reverberation will be easily erased and target echo will be preserved. Based on the analysis above all, a sub-optimum detector based on reverberation-whiten in FrFT field is advanced. The validity of these conclusions is validated by computer simulations. A satisfying result is achieved.
Active Control Research of SαS Impulse Noise Based on the Nonlinear Transformation
Authors: Li Pei , Zheng Jun , Bai Xue Feng , Song Xiao Na
Published: July 2014

Noise affect people’s all kinds of activities widely, such as sleep and rest, damage to the hearing, and even cause the nervous system, cardiovascular system, digestive system diseases. In practice, we often encounter pulse signals that are extremely harmful to human body health. In this paper, active noise control of symmetric α stable (SαS) distribution impulsive noise is studied. The algorithm based on the nonlinear transformation is proposed. Compared to the previous algorithm, it does not need the parameter selection and thresholds estimation. Results prove the effectiveness of the algorithm.
Pseudorandom Generators Based on One-Way Functions
Authors: Gao Shu Jing , Song Ting Qiang , Zhang Wei
Published: July 2014

Pseudorandom Generators is an important notion of cryptography. A new randomized iterating method of one-way function is proposed, after the analyzing of current research on pseudorandom generators based on one-way function. On the basis of this randomized iteration, a pseudorandom generator with linear seeds length is constructed using general regular one-way function and universal hash function. The output sequence of the proposed PRNG is unpredictable and the length of the seeds is linear to the input length of the one-way function.
A Class of Nonlinear Singular Difference Inequality in Engineering
Authors: Wang Wu Sheng , Hou Zong Yi
Published: July 2014

In this paper, we discuss a class of new nonlinear weakly singular difference inequality. Using change of variable, discrete Jensen inequality, amplification method, the mean-value theorem for integrals and Gamma function, explicit bounds for the unknown functions in the inequality is given clearly. The derived results can be applied in the study of fractional difference equations in Engineering.
230MHz Wireless Communication Network Architecture and Design of Power Consumption Information Collection System Based on WiMAX
Authors: Liu Yan , Zhu En Guo , Liu Xuan , Dong Li Jun
Published: July 2014

To improve the performance of power consumption information collection system and to solve the problem of system capacity small and the problem of low data rate, combined with the characteristics of WiMAX technology, the 230MHz wireless communication network of Power consumption information collection system was proposed based on WiMAX; The function and working methods of the communications network was designed. Implementations applicable to power consumption information collection system's key technologies was proposed such as Time division duplex, carrier aggregation, Software-Defined Radio through experimental verification. The results show that the use of this kind of communication networks can improve the data transfer rate, meet the bandwidth requirement, improve the reliability of data transmission and system Capacity and meet the business requirements of power consumption information collection system.
A Novel Approach for RFID Data Cleansing Based on Bayesian Inference
Authors: Yang Fan , Liu Long Zhang , Lu Xing Jia
Published: July 2014

Radio Frequency Identification (RFID) technologies are used in many applications for data collection. However, raw RFID readings are usually of low quality and may contain many anomalies. The solution should take advantage of the resulting data redundancy for data cleaning. In this paper we propose a Bayesian inference based approach for cleaning RFID raw data. Our approach takes full advantage of data redundancy. To capture the likelihood, we design a 3-state detection model and formally prove this model can maximize the system performance.
An Analysis of the UAV Relay Coverage in Mobile Ad-Hoc Network
Authors: Huo Shuai Ke , Li Yan Wen , Li Hao , Zhu Qui Ming , Zhou Sheng Kui , Chen Wei Zhen , Jiang Zhi Cheng
Published: July 2014

In a Mobile Ad-Hoc Network (MANET), the optimal placement and movement of relay UAVs and the performance of the relay network are all closely related to the propagation and coverage area of the relay signals. In this paper, on the basis of the geometric model of the relay link and relay signal coverage area, synthetically considering the impact of the propagation path loss, the multipath fading and the shadow fading, we study the coverage area of the relay signals by applying a statistical model based on the coverage of outage probability. The simulation results show that the channel fading has big effects on the radius of coverage area, and the radius of coverage area will increase rapidly with the increase of the outage probability. The results provides valuable recommendations for the placement, the movement strategy and network performance evaluation in the MANET.
Analysis of Broadband Access Solution for Intelligent Community
Authors: Sun Wen Yan , Wang Bu Jiang , Guan Shao Peng
Published: July 2014

The design of broadband access network is a key link in the construction of intelligent community. DSL, FTTx, WLAN and WiMax are the most common kinds of broadband access technologies. In this article, we provide the basis for solving the broadband access problem through the comparative analysis on the advantages and disadvantages of those technologies.
Layered Region Based Flow-Sensitive Demand-Driven Alias Analysis
Authors: Pang Long , Su Xiao Hong , Ma Pei Jun , Zhao Ling Ling
Published: July 2014

The pointer alias is indispensable for program analysis. Comparing to point-to set, it’s more efficient to formulate the alias as the context free language (CFL) reachability problem. However, the precision is limited to flow-insensitivity. To solve this problem, we propose a flow sensitive, demand-driven analysis algorithm for answering may-alias queries. First the partial single static assignment is used to discriminate the address-taken pointers. Then the order of control flow is encoded in the level linearization code to ease comparison. Finally, the query of alias in demand driven is converted into the search of CFL reachability with feasible flows. The experiments demonstrate the effectiveness of the proposed approach.
Research on Spring-Back Simulation and Die Surface Optimization of Automotive Panel Stamping Process
Authors: Song Hao , Bi Da Sen , Li Chao , Guan Xiao , Yang Guang
Published: July 2014

The spring-back phenomenon in automotive panel forming is one of the main quality problems, which may affect the tolerance and final shape of panel products. The stamping and spring-back process simulation for the automotive panel were realized by using the Auto form software, emphasizing on the possibly spring-back quantity forecasted and the die surface was optimized to control spring-back. The reasonability of optimization scheme was proved by comparing the simulation result with the actual part.
Study on a Controlled Splitting Scheme Based on Layer Expanding Graph Algorithm
Authors: Yang Jian , Tang Fei , Liao Qing Fen , Wang Yi Fei
Published: July 2014

Optimal controlled splitting is an emergency strategy to split the power system into several sub-regions based on global electrical information before the collapse of the system which is subject to severe disturbances. How to seek the optimal splitting sections rapidly and accurately is a key problem in controlled splitting field. A controlled splitting scheme based on layer expanding graph algorithm is presented in this paper. Firstly, source nodes of island regions extend out for the formation of the island regions. Secondly, island regions can be combined to make up synchronous sub-regions on the basis of the clustering of generators. At last, the optimal sections can be determined according to the initial and improved adjustment of splitting sections. Moreover, the scheme proposed can be adapt to the change of operation mode of the power system. The accuracy and effectiveness of the scheme is shown by the simulation results of CEPRI 36-bus system.
Coupled Vibration Control of Tuned Mass Damper in Both Horizontal and Torsional Direction
Authors: He Hao Xiang , Han En Zhen , Lv Yong Wei
Published: July 2014

Traditional tuned mass damper (TMD) can reduce the dynamic response of structure under earthquake, but the traditional tuned mass damper is not effective to reduce translation-torsion coupled vibration. A two-directional horizontal and torsional tuned mass damper, which includes tuned mass blocks, torsional blocks and rotation lever, is proposed. The horizontal and torsional response of the building structure is controlled by the movement and the rotation of the multi-dimensional tuned mass damper (MDTMD) in different directions. According to the movement mechanism of the MDTMD, the dynamic equation for the control system considering eccentric torsion effect is established. An eccentric structure with MDTMD is analyzed to verify the control effctive for the horizontal and torsional coupled system under earthquake, and the reduction effect is compared with the traditional TMD. The results show that the coupled response can be reduced effectively by MDTMD and the vibration reduction ration is much higher than traditional TMD.
Design and Experiment of the Frictional Sensor for Underground Structure Monitoring
Authors: Wang Jian , Lian Wei Ping , Hua Hui
Published: July 2014

A type of frictional sensor which can be applied to measure the frictional force between soil and underground structure is invented. The key part of the senor is an elastic beam which has very small axial deformation under axial force but has much larger transverse deformation under same transverse forces, and the frictional force is calculated from the beam deflection. The advantage of the sensor is that it can be easily produced and it has very clear mechanical response under frictional force. Numerical analysis and experiments show that the frictional sensor is stable with high resolution. Moreover, it is almost not influenced by soil pressure normal to the soil-structure interface.
Research for Structural Damage Identification Method Based on Stable Time Series and Principal Component Analysis
Authors: Lu Jing Zhou , Wang Jia Chen , Zhu Xu
Published: July 2014

In this paper, we introduce a set of techniques for time series analysis based on principal component analysis (PCA). Firstly, the autoregressive (AR) model is established using acceleration response data, and the root mean squared error (RMSE) of AR model is calculated based on PCA. Then a new damage sensitive feature (DSF) based on the AR coefficients is presented. To test the efficacy of the damage detection and localization methodologies, the algorithm has been tested on the analytical and experimental results of a three-story frame structure model of the Los Alamos National Laboratory. The result of the damage detection indicates that the algorithm is able to identify and localize minor to severe damage as defined for the structure. It shows that the suggested method can lead to less amount of computing time, high suitability and identification accuracy.
Research on Recognition Methods of Crack Damage from Beam Based on the Vibration Modal
Authors: Fang Zhi Hua , Liu Xiang Yang
Published: July 2014

Structural crack damage will degrade its carrying capacity, and affect the security of the structure. Thus early detection of crack damage is a guarantee of the structure safety. Cracks can change the vibration characteristics of the structure, therefore we proposed a method of identifying the crack damage based on the vibration modal. Take both ends fixed beam as an example, through establish the finite element models of crack-free beam and the crack beam with different location and different depth, we calculate the displacement modal parameters of beam before and after the damage, analyze the variation law of displacement modal horizontal component of change and displacement modal Axial displacement difference rate of change varies with crack depth and location, results show that the variation of displacement modal horizontal component and the change rate of displacement modal Axial displacement difference along crack direction are sensitive to cracks location and depth, these can be used as a basis for identification of beam’s crack damage.
Performance-Based Design and Table Test Study on Hybrid Structure Combined with outside Steel Grid and Inner Reinforced Concrete Tube
Authors: Guan Zhi Zhong , Ge Jia Qi , Ma Bo Tao , Zhang Ling , Wang Ming Zhu , Zhang Man Sheng
Published: July 2014

With the hybrid structure including outer steel grids and inner reinforced concrete core tubes (RCCT) as the background, the key problems involved in the performance-based structural design are analyzed and the table test is conducted. Anti-seismic and stability indicators are defined based on the structural characteristics; The research on seismic response is made through elastic-plastic time-history analysis and verified through the table test; The overall stability of the outer steel grids and the anti-collapse capability following the ineffectiveness of some key components are analyzed. Results show that the structure in which the outer steel grids are connected with internal steel frame and RCCT is practicable, and the said three systems can work together effectively; The time-history analysis shows that the structure is weak at the elevation of 5-15m but can still meet the expected anti-seismic target under rare earthquakes. The space steel structure features sound stability and high redundancy, which ensures the structure will not collapse even if several key components are damaged.
Health Monitoring System Design of Coastal High-Piled Wharf
Authors: Liu Hong Biao , Li Hong Nan
Published: July 2014

There is little research on health monitoring technology of coastal ports at present. Based on the characteristics of high-piled wharf in coastal ports and staying in particular environment, the mechanical properties of coastal high-piled wharf is analyzed, and the health monitoring parameters are proposed. Finally, the health monitoring system of coastal high-piled wharf is constructed. And the appropriate structural health monitoring system is designed for standardized front segment of a high-piled wharf in the Tianjin port. The monitoring parameters are proposed, and the sensors and specification parameters are provided to reach the point. The data acquisition and transmission subsystem implementation technology and related indicators are given. This can provide a reference for the long-term health monitoring system construction in coastal high-piled wharf structure.
Optimal Sensor Placement Based on Tabu Search Algorithms
Authors: Zhan Jie Zi , Yu Ling
Published: July 2014

In this study, the Tabu search (TS) algorithm is introduced into the optimal sensor placement (OSP) problem in the field of the structural health monitoring and moving force identification. A TS-based OSP procedure is proposed and further evaluated by some numerical simulations on a 2D planar truss model. The mean values of off-diagonal elements in a modal assurance criterion (MAC) matrix are used as the optimization objective function. Based on the criteria of MAC, determinant of fisher matrix, matrix condition number, and the least mean square error, the TS-based OSP procedure is evaluated through comparing with ones due to both of the energy coefficient-effective independence (ECEFI) and the effective independence (EFI) algorithms. The results show that the proposed TS-based OSP procedure is feasible with a higher accuracy.
Optimization Study of Stepwise Regression and Partial Least Squares Regression Models for Dam Security Monitoring
Authors: Hu Wei Ling , Deng Nian Wu , Liu Qiu Shi
Published: July 2014

Both Stepwise Regression (SR) and Partial Least Squares Regression (PLSR) can be applied in data analysis of dam security monitoring, and achieve in fitting and forecasting. However, SR and PLSR models still can be optimized. A variety of programs are studied and compared based on actual dam security monitoring data. The results show that the optimized-model is better in fitting and forecasting the monitoring data.
Experimental Research of Rebound Detection in Steel Fiber Concrete
Authors: Ye Jian Feng , Chen Hua Yan , Bi Xian Shun
Published: July 2014

For the application into country point highway of Xiamen to Kunming, a series of the C40 concrete with fly ash and slag have been studied by rebound detection and compression strength, the detecting wave of rebound value and compression strength is set up by regression analysis of the testing data. It is shown from the example that the compression strength and rebound value have good relativity, this rebound detection method used in steel fiber concrete is simple and practical.