bluuebunny/crossref_metadata_2025 huggingface dataset:
Constructing the Frequency-Energy Plot of Nonlinear Vibratory Systems via the Modified Lindstedt-Poincaré Method
Authors: Zhang Xin Hua
Published: March 2013

The frequency-energy plot(FEP) of nonlinear vibration systems is a powerful tool for investigating the energy transfer phenomena related wiht the internal resonances occured in multi-digreeof- freedom(Multi-DOF) nonlinear vibration systems. In this paper, the modified Lindstedt-Poincare method is employed for constructing the FEP of a two-DOF nonlinear vibrating systems. First, the original vibartion equations are modified for the application of the modified Linstedt-Poincaré method. Then, by using the modified Linstedt-Poincaé method, the nonlinear normal modes(NNMs) of the system are obtained. Finally, the frequency-energy plot of the system is constructed analytically. Numerical results show that the method adopted in this paper is effective and accurate.
Forced Vibration of Rotor Suppressed by a Automatic Ball Balancer (Nonlinear Principal Resonances)
Authors: Zhang Xiao Long , Dong Ya Bin , He Yu Min , Tong Mei Juan
Published: March 2013

The automatic ball balancer is equipment used to balance the rotor system online and control its forced vibration. Although the rotor system is a nonlinear system actually, especially the occurrence of the nonlinear elastic restoring force in the support of rolling elements bearings, many researches still focus on the linear rotor systems at present. The Jeffcott rotor acted by unsymmetrical nonlinear restoring force is studied in this paper. Through the resolving theoretically and simulating numerically, the principal resonance respond of the rotor system controlled by the balancer with two balls and its stability are studied, while the vibration characteristics and movement laws of the rotor and balls in every rotary speed region are analyzed. The results showed that the balancer can suppress the principal vibration of the nonlinear rotor system in high speed region very well.
Vibro-Acoustics Characteristics of Non-Uniform Ring Stiffened Cylindrical Shells Using Wave Propagation Approach
Authors: Li Bing Ru , Jiang Yue Peng , Wang Xuan Yin , Ge Hui Liang
Published: March 2013

Based on Donnell’s thin shell theory and basic equations, the wave propagation method is discussed here in detail, which is used to investigate the vibration and sound radiation characteristics of non-uniform ring stiffened cylindrical shells under various boundary conditions. The structure damp effects of cylindrical shells are investigated and the ring ribs were considered very narrow, and the rib forces are considered in radial direction. The conclusion are drawn that with the structural loss factor changing large, the whole pressure level are changed little, but the peak of resonance are slacking down obviously; The shell’s resonance frequency can be changed with irregular ring stiffened cylindrical shell .The work will give some guidelines for noise reduction of this kind of shell.
Optimal Design of Modified Cylindrical Gear Based on Minimum Flash Temperature of Tooth Surfaces
Authors: Jiang Jin Ke , Fang Zong De , Peng Xian Long
Published: March 2013

Considering the gap of the contact line of modified involute cylindrical gears influencing on loads, oil film thickness, the friction coefficient was determined on the basis theory of TCA、 LTCA and EHL. so oil film thickness and friction coefficient corresponded with loads on contact line were dispersed, which was used to computed discrete temperature according to the Blok flash temperature formula. and an approach of modified tooth surface optimum design based on the minimum flash temperature was proposed: the modified tooth surfaces was defined as a sum of theoretical tooth and cubic B-spline fit surface based on the uniform grid points created by double parabolas and a straight line and whose normal vector was deduced, besides, used genetic algorithm to optimize the parameter of curve, and get the best modified gear tooth surfaces. the results shows that oil film is thicker in engaging-out, coefficient of friction is contrary, which is responsible for lower flash temperature in engaging-in, besides the flash temperature has little changes in the single tooth meshing zone, and helical gear has a lower flash temperature than spur gear due to higher overlap ratio.
The Research of High Precision FA45-29 Prototype Design and Process
Authors: Xuan Liang , Guan Tian Min , Lei Lei , Lv Chang Xiu
Published: March 2013

The machining accuracy grade of cycloid gear in high precision two teeth difference cycloid-pin gear planetary transmission is different to general gear, so it can’t be designed according to the requirement of universal transmission accuracy, this paper presents the design precision grade requirements of high precision cycloid. In the traditional process the two teeth difference profile need gear grinding three times include fixing addendum, which will affect the accuracy of cycloid-pin tooth profile. This paper puts forward the process route of molding grinding. In order to detect the accuracy of two teeth difference cycloid gear tooth profile timely when processing, this paper takes double rod measuring method gives the testing size of cycloid gear tooth profile. This paper adopts the method that the three piece of cycloid gear as a whole to process, which will guarantee the consistency and the same performance of the three pieces of cycloid gear.
A Carrying Platform of Spilled Oil Recovery System Used on Unmanned Surface Vehicle
Authors: Cai Kun , Wang Jian Hua , Yang Yong Sheng
Published: March 2013

In some dangerous water and shoal area, we need unmanned surface vehicle to recover the spilled oil for safety. After comparing with the present spilled oil recovery machine, we design a carrying platform to carry the spilled oil recovery machine for unmanned surface vehicle. This carrying platform is installed on the front of unmanned surface vehicle, and carrying the spilled oil recovery machine. When unmanned surface vehicle reach the destination, it put spilled oil recovery machine on the water surface, until the end of the work, it recover spilled oil recovery machine to the unmanned surface vehicle.
Raising Torque Calculation System Design for Single-Arm Pantograph
Authors: Guan Tian Min , Liu Xiaojun , Xuan Liang
Published: March 2013

Abstract. Raising torque is one of the import parameters when we design pantograph. how we can calculate raising torque accurately and effectively is what this paper studies on. This article describes the structure of single-arm pantograph briefly , analyses the influen of contact pressure between pantograph and catenary on pantograph’s work, calculates one single arm pantograph’s raising torque by virtual work principle based on establishing mathematical computational geometry model of pantograph, finally, designs the raising torque calculation system using programming language.
Numerical Analysis of the Vibration of Pipes Conveying Fluid under the Influence of Vertical Branch
Authors: Wang Xiao Yang , Zhou Zheng , Liu Xing Pei
Published: March 2013

Nonlinear vibration damage of pipes conveying fluid is a major problem in today’s production and life. Enormous economic loses and safety hazards were caused by nonlinear vibration. Pipes conveying fluid with various branches are very common in actual engineering. Their mechanical properties and vibration mechanism is quite different from that of pipes conveying fluid without branches. This paper showed the nonlinear vibration mechanism of pipes conveying fluid with vertical branches and nonlinear vibration damage factors. Nonlinear vibration theory was used to check the pipeline and some reference data for the rational selection of working parameters were provided.
Analysis on Circumferential Clearance of Four-Ball-Pin Constant Velocity Joint
Authors: Yang Hong Xing , Guo Chang Ning , Shi Bao Shu
Published: March 2013

By using Matlab, the circumferential clearance changing law with any swing angle and rotating angle of four-ball-pin CVJ was obtained, the results show that, under the same size specification and machining accuracy, four-ball-pin CVJ has a roughly similar vibration amplitude with traditional tripod CVJ, when the CVJ rotates one circle at any swing angle, there are four fluctuations of circumferential angle in four-ball-pin CVJ, but there six fluctuations in tripod CVJ, so the former one fluctuate less and has much more slight impact on the vibration and noise during traveling. These results provide a theoretical basis for development and application of this new structural form of four-ball-pin CVJ.
Catastrophe Theory Applied in Structure by Vibration Gauge
Authors: Zhang Ye Min , Zhou Chuan Lu , Song Tao
Published: March 2013

This paper mainly make the experiment object vibration through some incentives. Pass the measured vibration measurement instrument output and the system vibration response characteristics, and get the system modal characteristics. Use frequency converter to control motor speed, to structure resonance, sealed by the experiment is feasible. The technology has been the state utility model patents. This structure for two hours of resonance, masonry structure were not see the destruction of the obvious that when energy limited, even resonance also cannot destroy the temporary masonry structure, but when weaken the structure stiffness later, masonry structure crack.
Analysis of Traction Characteristics of Grease-Lubricated Sliding Bearing
Authors: Yang Bo Yuan , Yan Xiaofan , Su Bing
Published: March 2013

Adopting the test rig of traction characteristics of grease-lubricated sliding bearing, the practical condition of sliding bearing was simulated and the traction coefficient of DGG Grease under different temperature, velocity and load was tested. Besides, the traction characteristics of the grease were also elaborated. The results indicate that the traction coefficient increases when the temperature gradually rises from room temperature while it gradually decreases when the temperature exceeds 85°C. Under the condition of high temperature and high pressure, the extreme pressure additive has obvious effects, the traction coefficient reducing and maintaining constant, so a better lubrication effect is realized.
Test and Analysis of Steel Cable Isolator for Medical Equipments in Field Vehicle
Authors: Su Wei Hua , Sun Jing Gong , Niu Fu
Published: March 2013

Medical equipment systems are precision system. There are some vibrations and impact in field vehicles from road or field environments. Therefore, shock absorber is significant in protection of medical equipment in moving vehicles. The objective of this paper is to provide a systematic investigation to design or evaluation of a shock absorber for protection of medical equipment system in harsh vibration-impact environment. A novel wireless damping shock absorber is designed and manufactured through coupling friction and spring. The physical mechanism of a prototype shock absorber is systematically investigated by dynamic test. A nonlinear dynamic model for the shock absorber is presented by analyzing the internal frictional dynamic phenomenon with respect to the prototype. Comparisons between experimental data confirm the validity of the model. In the meantime, evaluation of the importance of some key factors by using the mathematical model for designing is discussed. It shows amplitude and frequency of excitation, as well as ratio of damping area are the key factors to ensure the performances of the shock absorber. The change of these factors will change the working characteristics and performances of the shock absorber.
A Spatial-Temporal Correlation Based Novel Clustering Algorithm for Wireless Sensor Networks
Authors: Wang Lei Chun , Zhou Guo Yu
Published: March 2013

Considering the requirements of energy saving and data aggregation, and the characteristics of spatial-correlation and temporal-correlation in wireless sensor networks (WSN), this paper proposes a spatial-temporal correlation based novel clustering algorithm, STCBCA. In cluster formation phase, STCBCA clusters nodes in the network according to the spatial correlation between nodes and cluster heads. In data gathering phase, STCBCA clusters data sampled by nodes via the criterion of data cluster, and then sends them to the cluster heads. Our results show that STCBCA can reduce data traffic, prolong network lifetime and improve quality of data aggregation against the clustering algorithm DCAM.
SOC Estimation of Traction–Battery for Electric Vehicle Using Rebound Voltage
Authors: Li Bei , Chen Lun Qiong , Zhang Di
Published: March 2013

The thesis studied the monomer power battery, in order to overcome the difficulty in state of charge(SOC) online testing, the thesis put forward a new method to do SOC online estimation. By studying the rebound voltage caused by lead-acid battery when it is offline, with the consideration on elements as discharge rate, depth of discharge, temperature environment and so on, the thesis build a function relation between the rebound voltage and the SOC; with the adoption of 89S51 micro-controller in real-time measurement and calculation, we successfully estimated the SOC of intelligent traction–battery online.
Improvement and Realization of Miniature Flexible Gyro in the Photoelectric Platform
Authors: Wang Ping , Yang Jing , Yao Jun Jun
Published: March 2013

Generally ,it was precession of flexible gyroscopic not gyroscopic nutation which was just considered in engineering design. However, in photoelectric stabilized platform, this nutation characteristics of angular position flexible gyro has been restricting the stabilized accuracy of platform seriously. In this paper, firstly the output characteristics of a miniature flexible gyro was measured by characteristic of gyroscopic motion, four main kinds of frequency components in output characteristics was analysed. The methods were realized in the miniature flexible gyroscope in the laboratory by adopting the two measures of the secondary trap circuit and improvement of torque component.Test results showed that, the improvements made nutation frequency of gyro and envelope at 40Hz converged fastly , and the output noise of gyro angular position was decayed to more than15dB. In the end, the gyro was applied to chariot photoelectric stabilized platform ,the isolation of platform and carrier got improved from 1~2mil to 0.3mil.
Research on Geometric Model for Solving the Displacement of Vane Pump
Authors: Jiang Ben Chi , Wang Jian Bin
Published: March 2013

Displacement is one of the most important parameters of vane pump, but the physical meaning of the pumps’ displacement is relatively difficult to understand. A new approach is presented to simplify the calculation process. On the basis of analyzing the working principle of vane pumps, corresponding visual geometric models were separately built, and then the displacement of vane pump can be directly calculated by those models. This method is applicable not only to single-acting pump but to double-acting pump, it shows a novel vision and is easy to master.
Multi-Channel ARMA Signal Covariance Intersection Fusion Kalman Smoother
Authors: Zhang Peng
Published: March 2013

For the multi-channel ARMA signal with two sensors, by the classical Kalman filtering method and the covariance intersection (CI) fusion method, a covariance intersection fusion steady-state Kalman signal smoother is presented, which is independent of the unknown cross-covariance. It is proved that its accuracy is higher than that of each local Kalman signal smoother, and is lower than that of the optimal signal fuser weighted by matrices. The geometric interpretation of the above accuracy relations are presented based on the covariance ellipses. A simulation example result shows its effectiveness and correctness.
RF Pulse Signal Study in the SAW Delay-Line Sensor
Authors: Li Tian Li , Xu Gang , Fang Li Cun
Published: March 2013

The SAW delay-line sensor can obtain the energy of the RF pulse query signal through the wireless method. The RF pulse echo signal of the SAW delay-line sensor is significant effected by the different query pulse width of the RF pulse query signal, which is directly related to the sensor precision. The size of the IDT and reflectors, the distance between the IDT and reflector, and the distance among the different reflectors can affect the selection of the RF pulse query signal. The selection method of the query pulse width is discussed through the theoretical analysis and experimental analysis according to the SAW delay-line transmission characteristics. The query pulse width can be calculated directly through the design parameters of the SAW sensor.
Signal Process of Gas Monitoring System in Fiber Sensor
Authors: Jia Chun Rong , Di Zhigang , Zhang Jing Xuan
Published: March 2013

Gas monitoring has been the most important project in coal mining, and the main basis of gas is CH4. As a result, it is fatal to develop a safe and highly sensitive CH4 sensing system to detect CH4 concentration real-time. Moreover, signal process system is important for this sensing system. The novel signal process system was proposed in this paper, and phase lock amplifying and signal sampling processing technology was utilized to monitor CH4 concentration steadily and reliably. The experiment results indicated that the steady is 0.4%, and relative error is less than 0.02%. So this signal process system is feasible and effective, and can meet the requirement of technology
A Straight-Line Trajectory Tomography Method with Algebraic Iteration Reconstruction
Authors: Fu Jian , Luo Liang Ming , Tan Ren Bo
Published: March 2013

A straight-line trajectory tomography method, based on multiple tilted X-ray cone-beams formed by multiple sources and detectors, is investigated. In this method, multiple cone-beams are fixed and tilted at different positions and only the object translates along a straight-line trajectory. This kind of imaging method may have potential applications in industry testing and security inspections. As is known, projection data from a straight-line trajectory based on single cone-beam are incomplete and their reconstruction suffers from a limited-angle problem. The proposed straight-line trajectory tomography method based on multiple tilted X-ray cone-beams can be used to compensate these deficiencies. To reconstruct images, algebraic reconstruction technique (ART) algorithm is deduced. Numerical simulations validate our method.
Design of an Appearance Evaluation System for Porcelain Ware
Authors: Cao Li Gang , Feng Hao
Published: March 2013

To improve the efficiency and accuracy of porcelain appearance evaluation, a kind of automatic evaluation system was presented, which composed with industrial cameras, USB(Universal Serial Bus) data acquisition card and step motor etc. The software was mainly developed with C# language. Modules such as image pre-processing and evaluation algorism etc, were developed with matlab program language. Communication between C# program and matlab program was implemented with component technology. Experiments with bowls show that the system can conveniently evaluate the porcelain by its appearance and the result is accurate.
Measuring Theory Research on the Automobile Steering Angle Automatic Measuring System
Authors: Fu Hu Dai , Wang Zheng Zhong
Published: March 2013

It is studied that a great proportion of traffic problems lies in vehicles’ steering system, and the maximum steering angle decides their steering capability and their minimum turning radius. The measuring principle of rapid measuring system, and the automatic tracking principle of measurement system have been analyzed in the paper. Also, the infrared tracking, the measuring plate positioning, the calculation of minimum turning radius, and the processing method of the test results have been described in detail. It is proved that the automatic automobile steering angle detecting system has reached the general requirements both in detection resolution and the measuring accuracy.
Research on Flow Divider of High Pressure Water-Jet Target Material Detection Device
Authors: Yang Hong Tao , Zhang Jing , Zhang Wei
Published: March 2013

In order to identify target material and physical dimension quickly and effectively by utilizing high pressure water-jet, the equal eigenvalues of reflected sound signal is required when high pressure water-jet impulse the same target through array nozzles. It is necessary to research the reasonable structure for flow divider to ensure that pressure and flow of every nozzle are identical. According to the device structure size, basic structure of flow divider and pipeline connection request, structure parameters of flow divider were acquired and introduced in this paper. The required initial parameters were calculated on demand, and the inside fluid state of flow divider was also judged. The governing equations are developed by combining incompressible viscous fluid continuity equation with N-S equation and standard k-ε turbulence model. Structure parameters were optimized by combining fluent with the orthogonal experiment. Through the comparison of pressure and flow data acquired in the analysis of the inside flow field of the flow divider, maximum relative pressure deviation of nine channels that based on the optimal size is 0.0243% and maximum relative deviation of the mass flow is 0.0000187%. The requirements of pressure and flow uniformity for identifying target material by using high pressure water-jet and multiple nozzles can be met perfectively.
Intelligentized Soft X-Ray Picosecond Framing Camera Control System Design
Authors: Yu Hao
Published: March 2013

In order to meet the demand of diagnostic equipment on the intelligent network testing for inertial confinement fusion (ICF) research, an intelligent X-ray framing camera system is designed and implemented. Embedded PC/104 bus masters the whole system and realizes human-machine communication and networking. The self-designed multifunction interface card can realize the camera work point setting, mode switching and environment monitoring. The specialized software and hardware make the camera has the ability of self-diagnosis and automatically adjust work point. The system improves the stability, reliability, consistency and precision of the camera. It is significant for furthering analysis the ICF issue.
Research on Positioning System of Insulator String Flashover in High Voltage Transmission Line
Authors: Lin Yi Feng , Jin Hong Yang , Ding Ke
Published: March 2013

Considering that insulator flashover accident frequently occurs in high voltage transmission line, a kind of insulator string flashover positioning system is designed. The positioning system is on based on the fact that ultrasonic and ultraviolet energy is released when flashover occurs. To make sure whether a flashover accident occurred, sensors are used to detect ultrasonic and ultraviolet waves near the insulators in real time. The detecting results and accident position information will be uploaded to the monitoring center wirelessly using GSM/GPRS (Global System of Mobile communication / General Packet Radio Service), which can make it easy and fast for operating personnel to locate the accident, reduce troubleshooting work and quickly recovery power transmission. The experiment shows that the system has lots of advantages such as high sensitivity, high positioning accuracy, more stable and so on.
The Research on Locating License Plate of Vehicle Based on Color Conversion and Projection
Authors: Wang Chuan Qi , Zhang Jian , Wang Wei Rong , Gu Xue Jing
Published: March 2013

In the research field in automatically recognizing license plate of vehicle, to locate the license plate acts as the key issue. The paper posed the method by graying and binarizing the color image firstly, and then to project the binarized image in both horizontal and vertical directions, as well as to locate the area of license plate according to its geometrical characters maximally. The Test results proved that the method performed well in speed and precision of locating.
Design of Greenhouse Monitoring System Based on Zigbee
Authors: Wang Jun , Wu Cheng Dong , Wang Feng
Published: March 2013

To satisfy the requirement of the control parameters in greenhouse, this paper introduced the design scheme of monitoring and control system based on Zigbee due to its low-cost, simplicity and mobility. We designed the sensor node, control node and gateway node based on CC2430, described the design method of hardware circuit and the flow chart of software. By monitoring the environment factors in real time, such as illumination, temperature, humility and carbon dioxide, the spray system, ventilation fans and lighting lamps were automated controlled to satisfy crop growth requirement. The monitoring system is easy to expand and update, and the program interface is friendly to operate.
The Fault Diagnosis of Car Body Control System Based on the CAN Bus
Authors: Zhang Xuan , Sun Wei
Published: March 2013

A solution to the Car body fault self-diagnostics based on CAN bus is developed. It completes the fault diagnosis communication between the body controller and the diagnostic apparatus by treating the ISO15765-2 as the network layer, and the ISO14229 as the diagnostic application layer. The parameters and services of the two standards are customized to the needs and characteristics of the body control system. Finally, the diagnostic programs of the corresponding body control module and the upper computer are compiled and tested. Satisfactory results are achieved.
Weigh-in-Motion to Estimate Vehicle Weight of Rigid Pavement Strain Signal
Authors: Suo Chun Guang , Zhang Wen Bin , Yang Feng Jie
Published: March 2013

The aim of this research is to investigate the feasibility of developing a traffic load detector system for the purpose of accurate weighing vehicle to aid traffic management systems. The possibility of estimate the velocity, axle and gross weight of a moving vehicle from the surface of pavement tensile strain is investigated. The objective is to develop weigh-in-motion (WIM) technique to estimate the vehicle weight from the pavement responses with fewer disturbances to the vehicle’s vibration and traveling speed, and to provide more reliable and durable WIM systems and sensors. The repeatability, sources of error, and accuracy of weight prediction were discussed.
Methodology of Micro-Accelerometer Reliability
Authors: Jia Yu Bin , Huang Qing Wen
Published: March 2013

The basic analysis methodology of micromachined accelerometer reliability are developed. The reliability of micro-accelerometer system are basically analyzed mathematically based on probability theory, indicating that the fracture strength distribution of accelerometer structure keep to Weibill distribution, and the stress distribution keep to normal distribution. Fracture reliability degree for micromachined accelerometer is defined as the probability that strength is greater than stress. From this, we can predict and evaluate various micro-accelerometer fracture reliability under shock load. The methodology of reliability is also commonly suitable for other MEMS devices.
Fault Diagnosis for Marine Engine System Based on Complex Network Cluster Method
Authors: Zhang Ai Ping , Ren Guang , Jia Bao Zhu
Published: March 2013

Fault diagnosis can be achieved by the cluster analysis process. We give a complete similarity measurement method and a cluster criterion function defined by modularity increment in complex network community detection. An agglomerative cluster method is proposed and the diagnosis rules are extracted to fault diagnosis for the marine engine system. Using the samples collected from self-manufactured marine engine room simulator, fault diagnosis simulation experiment is carried out to verify the algorithm performance. The results show that the method is accurate and less time-consuming, and is able to recognize the fault pattern which does not exist in the fault history data.
Nonequilibrium Charge Carrier Lifetime Testing Equipment for Semiconductor Materials by a Contactless Microwave Phase Method
Authors: Chen Song , Ni Zu Rong , Xiao Fen
Published: March 2013

The accurate measurement of nonequilibrium charge carrier lifetime is of vital significance in research and manufacture of crystalline silicon solar cells. A testing equipment based on a contactless microwave phase method was implemented by being embedded with GPIB, FPGA and a lock-in analyzer. A friendly operation interface was developed, based on the graphic programming language LabVIEW. The virtue of the equipment is achieved by automatic data acquisition and processing, which improves the automatization, efficiency and accuracy of the measurement.
Thermal Design, Analysis and Experimental Verification of Electronic Equipment of a Satellite Borne Microwave Radiometer
Authors: Chen Bo
Published: March 2013

Thermal design, finite element analysis and experiment verification of electronic equipment of a satellite borne microwave radiometer are introduced. Some methods were adopted to help heat conduct and a finite element model was built. The analysis results show that the temperature scopes of the main structures are from 45°C to63.9°C in the digital control equipment and 45°C to 68.7°C in the receiver equipment and all of junction temperatures of the components are lower than the derated maximum junction temperatures themselves and leave enough design margins, which match the requirements of thermal analysis. The experimental results show that the computing values are close to experimental values and the largest error is 10.1°C, which is allowed for engineering application.
The Simulated Calculation of Self-Levitation Force with Different Magnets Core in Ferrofluid Sensor
Authors: Hu Cheng , Li Qiang , Yuan Zuo Bin , Yang Yong Ming
Published: March 2013

In this paper, the self-levitation force of ferrofluid in sensor is simulated calculation under different magnets core in ferrofluid sensor. The relationship between self-levitation force and height under different radius of magnet core, and the relationship between self-levitation height and length of magnet core are obtained.
Hybrid TOA-TDOA Positioning Algorithm in AIS
Authors: Jiang Yi , Hu Qing , Yang Dong Kai
Published: March 2013

Positioning algorithm in automatic identification system (AIS) is being investigated in the literature due to the importance in safety and national security services. Nowadays, position information in AIS originates from the navigational sensors in extern system. In this paper, we introduce a novel algorithm for ship positioning using both time and time difference estimates, which lead to enhanced versions of the time of arrivals and time difference of arrivals positioning method. Moreover, the accuracy of the proposed hybrid positioning algorithm is evaluated. Finally the simulation results have shown the validity of this novel positioning algorithm.
Direct and Indirect Strain Measurement of Flexible Printed Circuit Boards - fPCBs
Authors: Arruda Luciano , Coimbra Cristiano , Andolfatto João Marco
Published: March 2013

This work is related to reliability of strain measurement in flexible printed circuit boards (fPCBs) made with polyimide substrate. It was observed that the fPCBs are very sensitive to strain mounting stiffness. The indirect measurement method will be done employing High Speed Camera (HSP). The direct method will be formulated in two ways: 1) conventional strain gauge glued in an fPCBs; 2) printed strain gauge in a polyimide substrate. This paper will point out mistakes and show advantages when using different method to extract the deformation field of the selected area in a flexible thin film.
Centroid Localization Algorithm Based on Bicubic Interpolation Gray Square Weighted
Authors: Zhou Jing , Chen Xiao Lin , Li Shi Jun , Huang Dong Yan , Ma Guo Ze
Published: March 2013

The 3D coordinates of measured point is embodied in 2D image coordinate of the optical characteristic point via the visual measurement system. Based on the gray square weighted centroid localization algorithm, the paper presents bicubic interpolation gray square weighted centroid localization algorithm, increases the number of effective pixels around the optical characteristic point imaging center, and reduces noise error via the gray square weighted, improves the imaging center location accuracy of optical characteristic point, realizes the accurate location of the optical characteristic points. Results indicate application of the proposed algorithm to location, the standard tolerance along the direction of x is 0.0022 Pixel, the standard tolerance along the direction of y is 0.0023 Pixel, compared with the others, the standard tolerance is minimum and discrete to a lesser degree distancing ideal image point, that is, the proposed algorithm has higher location accuracy. The maximum tolerance along the direction of x is 0.008 Pixel, the one along the direction of y is 0.007 Pixel, compared with the other two algorithms, the maximum tolerance is minimum .Results indicate that the stability of the proposed algorithm is better.
Development of Frequency Difference Lock Based Brillouin Sensor
Authors: Liu Dong Dong , Wan Sheng Peng , Peng Di , Zhao Yi Zhu
Published: March 2013

In the paper, we research frequency difference lock of two lasers. In the optical fiber Brillouin sensor, two beams of laser frequency stability around 11G to achieve stimulated Brillouin scattering or heterodyne detection. Currently, we mainly through the optical delay to implement the locking of the frequency difference in the Brillouin sense. through the electric field amplify circuit to improve lock accuracy and improve the system program.
The Assessment of Line-to-Plane Perpendicularity Error Based on Particle Swarm Optimization
Authors: Bao Jia Ding , Zhao Rui , Xu Bo , Sun Yong Hou
Published: March 2013

Perpendicularity error has great influence on the quality and performance of the geometrical products, and it is of great importance to guarantee the interchangeability. Particle swarm optimization (PSO) is an extraordinarily useful intelligent optimization algorithm with several advantages of fast convergence rate and easy realization for computer in the multidimensional space function optimization and dynamic target optimization. As a result, it is very accurate and is accordant with the requirement of minimum zone method (MZC) using PSO to associate the base plane of perpendicularity error.
Asymmetric Separators and Asymmetric Separator Spaces
Authors: Chen Shao Bai , Tang Wen Qian , Chen Xiao Dan
Published: March 2013

This paper introduces the asymmetric separator, which is a class of binary relation. They can separate and merge things by their properties. It illustrates the operation of asymmetric separator, the asymmetric separator nucleus of general binary relation and the asymmetric separators determined by set or function. Some asymmetric separator spaces constituted by asymmetric separators are studied.
Bacterial Foraging Algorithm Based on PSO with Adaptive Inertia Weigh for Solving Nonlinear Equations Systems
Authors: Mai Xiong Fa , Li Ling
Published: March 2013

Bacterial Foraging Algorithm (BFA) has recently emerged as a very powerful technique for optimization,but it also confronts the problems of slow convergence and premature convergence. To overcome the drawbacks of BFA, This article merge the idea of particle swarm optimization algorithm with adaptive inertia weigh into the bacterial foraging to improve the speed and convergence capabilities of BFA, and according to this a bacterial foraging algorithm based on PSO(APSO-BFA) is presented. Simulation results on five systems of nonlinear equations show that the proposed algorithm is superior to the other two kinds of bacterial foraging algorithm
Robust Optimization Based on an Improved Genetic Algorithm
Authors: Yan Le Wei , Sun Zuo Yu , Mao Ke Yang
Published: March 2013

An improved genetic algorithm is applied to solve the problem of the robust optimization for structures under complicated loading. The objective function is constructed by signal-to-noise ratio of Taguchi target. Numerical examples demonstrated that the improved genetic algorithm combined with the robust design method can effectively solve the problem of the robust optimization for structures under complicated loading with uncertain parameters.
A Kind of Classification Algorithms of Data Mining and Quantitative Analysis
Authors: Zhang Yan Feng , Li Ting Ting
Published: March 2013

C4.5, Bayesian network and Sequential Minimal Optimization (SMO) are three typical classification algorithms in data mining. Using cross-validation method with 10 folds get analysis and calculation results of the experiments for the three classification algorithms in the same training set and test set. The main metrics include accuracy, precision, speed, robustness, scalability and comprehensibility, we use margin curve show these. It provides a theoretical and experimental basis for users to select a proper classification algorithm with different training sets in quality and amount.
Dynamic Modeling of Marine Diesel Propulsion System in All Kind of Running Conditions
Authors: Wang Hai Yan , Chen Lei , An Ji
Published: March 2013

For matching various working condition of ship propulsion system, a modified mean value model of a large-scale low-speed directly reversible marine diesel engine is put forward. A starting and braking torque module is added to the conventional model. A new friction model which considers static friction is adopted. So, the new model can run smoothly across all propulsion working condition, such as starting, running, braking, reversing, etc. The dynamic simulation models of propeller running across four quadrants and ship longitudinal motion are given too. The 5S60MC marine diesel engine equipped on a 76000DWT bulk carrier is taken as an example. The simulation results show that steady data of diesel are in good accordance with test-bed data, and dynamic data match to ship sea trial data in crash stop condition. The best is to read these instructions and follow the outline of this text.
Estimation of Tension Force in Short Hangers Using Added Mass Method
Authors: Shen Yong Gang , Xie Xu , Sun Liang Feng , Huang Sai Hua
Published: March 2013

For short hangers, the influence of flexural rigidities and boundary conditions on tension measuring cannot be neglected. But there has no effective method to precisely calculate hanger tension considering the two parameters. This paper proposes the Added Mass Method (AMM) to simultaneously identify the tension, flexural rigidity and boundary condition of short hangers. In this method, the effect of mass distribution of structure on natural frequencies has been studied to add extra calculation conditions for establishing the eigenvalue equation set. The method of Genetic Algorithm (GA) with adaptive crossover and mutation rate is used to solve the equation set quickly. The results provides that the AMM is a high-accurate field testing technology in tension measurement for short hanger of arch bridge.
The Thermal Hysteresis of the Type I Antifreeze Protein ‘HPLC-6’: The Effect of Small System
Authors: Li Li Fen , Liang Xi Xia
Published: March 2013

According to Hill’s thermodynamics theory for small system, the effect of small system on the thermal hysteresis activity of type I antifreeze protein ‘HPLC-6’ is discussed in this article. We conclude that when the solution is very dilute, the effect is not visible, and as the concentration increases, the effect becomes more visible than before, and the result also shows that the thermal hysteresis temperature becomes larger when the effect of small system is considered.
Research on Plasma Spray Particle Impact Matrix Process Simulation
Authors: Liu Chang Sheng , Zeng Hao Ping
Published: March 2013

Plasma spraying rapid making of functionally graded mold is an effective preparation method. In this paper, finite element method simulation of the plasma spray process a single droplet deformation and matrix effects in the process. Studies have shown that: speed large solidification time is short, more conducive to the formation of the coating; speed large residual thermal stress is small; preheat temperatures are high, the particle flattening effect, The research results will provide theoretic basis for improving spraying coating quality.
Tensile Strength of Cu Sheets Welded by Ultrasonic Metal Welding
Authors: Park Dong Sam , Jang Ho Su , Park Woo Yeol
Published: March 2013

This paper gives a description of an experimental study on the ultrasonic welding of metals. In ultrasonic metal welding, high frequency vibrations are combined with pressure to join two materials together quickly and securely, without generating large amount of heat. Horn, a key part of ultrasonic welding machine, should be designed very accurately to get the natural frequencies and vibration mode required. In this study, a horn is designed and developed for ultrasonic welding of Cu sheets. The tensile strength of welded parts is investigated for evaluation of weldability. Experimental parameters of welding test is set as follows; welding time 0.4s ~ 3.4sec. and vibration amplitude 40%, 60%, 80% and welding pressure 1.5bar, 2.0bar, 2.5bar. Samples are Cu sheets of 0.1mm thickness. Experimental results showed that the tensile strength increase as welding parameters increase, but when welding pressure is excessive, the tensile strength decrease due to fracture of the Cu sheets caused by over-welding. These results could be successfully applied for ultrasonic metal welding in various fields of manufacturing industry.
Slow-Release Carbon Source Composite Materials’ Preparation and Used for Denitrification in Groundwater
Authors: Yang Fan , Wang He Li
Published: March 2013

Four kinds of slow-release carbon source composite materials were prepared and used as carbon source and biofilm attachment carrier for groundwater nitrate pollution bioremediation. Their performances were detected through static and continuous experiments. The results showed that: In the static experiments, HB20 and HB40 had general release carbon ability, their CODMn were 5.42 and 12.83 mg/L respectively; In the continuous experiments, NO3-N removal rate of HLE decreased from 57.9% to 13.1% within 30 days, the denitrification endurance was not good. Organic carbon source can be released continuously by HBE which had the best denitrifying effect. In the operation of 66 days, above 96.0% NO3-N was removed and NO2-N level was below 0.02mg/L when influent NO3-N =30.0mg/L and HRT=24h. HBE was the most suitable carbon source carrier material which was used in groundwater nitrate pollution bioremediation.
Investigation of Honeycomb Sandwich Composite Structure with Pre-Damage under Uniaxial Compression
Authors: Yan Hui Min , Liu Bin , Xu Fei , Liu Ya Ge
Published: March 2013

In this paper, the failure modes of the honeycomb sandwich structure under uniaxial compressions after impact (CAI) are analyzed through experiments and Finite Element Method (FEM). Three cases of impact damage location, two cases of impact damage depth and adhesive properties are investigated by the comparisons of corresponding non-destructive structure. Several conclusions are drawn: the failure modes and the initial damage positions obtained from experiments and FEM simulations are almost the same; the location of impact damage may affect the overall loading capabilities of the sandwich structure, whose decreasing rate peaks when the damage is at the top surface and drops when the damage is at the marginal area; different adhesive layer property of interface may lead to the failure mode change, that is, instead of honeycomb core failure, interlaminar failure will occur when the fracture energy of the adhesive layer is low; the damage level and risky location of the structure will vary relevant to the impact energy.
Explorative Study and Prediction of Overtempering Region of Disc Heated by Induction Process Using 2D Axisymmetric Model and Experimental Tests
Authors: Barka Noureddine , El Ouafi Abderrazak , Bocher Philippe , Brousseau Jean
Published: March 2013

Thanks to many industrial benefits that it exhibits, induction heating process is very promising for its potential application in manufacturing production. To understand the industrial context, it is necessary to investigate the process by focusing on simulation and experimental aspects. In fact, this paper presents an original approach able to predict the overtempering zone with analyzing the temperature curves resulting from simulationand the hardness profile achieved by experimental validation. The proposed approach combines experimental validation and numerical simulation applied to 4340 steel disc in order to investigate the overtempering phenomenonand develop a very simplified and practical model able to predict the hardness curve with a fairly good accuracy. The developed model is validated by experimental tests and is used to evaluate the effect of machine parameters on the overtempering.
Nonlinear Dynamic Modelling of Weld Penetration in Gas Tungsten Arc Welding Process
Authors: Liu Yu Kang , Chen Shu Jun , Zhang Wei Jie , Zhang Yu Ming
Published: March 2013

Skilled welders can estimate and control the weld penetration based on weld pool observation. This implies that an advanced control system could be developed to control the penetration by emulating the decision making process of the human welder. In this paper a nonlinear dynamic model is established to correlate the process inputs (welding current and traveling speed) and weld penetration in Gas Tungsten Arc Welding (GTAW). An innovative 3D vision sensing system capable of measuring the weld pool characteristic parameters in real-time is utilized. Dynamic experiments are conducted under various welding conditions. Dynamic linear model is first constructed and the results are analyzed. The linear model is then improved by incorporating a nonlinear operating point modeled by Adaptive Neuro Fuzzy Inference System (ANFIS). It is found that the penetration state can be better modeled by the proposed ANFIS model.
Effect of Different Concentrations of Nitric Acid on the Conductivity of Single-Walled Carbon Nanotube Transparent Films
Authors: Gao Jing , Wang Wen Yi , Cui Li Jun , Chen Li Ting , Hu Xiao Yan , Li Hu , Geng Hong Zhang
Published: March 2013

Single-walled carbon nanotubes were dispersed in deionized water with sodium dodecyl benzene sulfonate as surfactant. The solutions were sprayed on UV and plasma treated polyethylene terephthalate to achieve transparent conductive films with excellent adhesion. The carbon nanotube films were further treated with different concentrations of nitric acid to improve conductivity. SWCNTs and films were characterized by thermo gravimetric analysis, field-emitting scanning electron microscopy, UV-VIS spectrophotometer, four-point probe method, and Raman spectroscopy. The results demonstrated that the conductivity of carbon nanotube films with high transparency was improved to a greater degree with higher concentration of nitric acid due to effectively removing residual surfactants. The low sheet resistance films of ~100 Ω/sq @ 80T% have widely applications in touch screen, flat panel displays, organic light emitting diode, and etc.