bluuebunny/crossref_metadata_2025 huggingface dataset:
An Efficient Memetic Algorithm for Dynamic Flexible Job Shop Scheduling with Random Job Arrivals
Authors: Zhang Liping , Li Xinyu , Wen Long , Zhang Guohui
Published: October 2013

Much of the research on flexible job shop scheduling problem has ignored dynamic events in dynamic environment where there are complex constraints and a variety of unexpected disruptions. This paper proposes an efficient memetic algorithm to solve the flexible job shop scheduling problem with random job arrivals. Firstly, a periodic policy is presented to update the problem condition and generate the rescheduling point. Secondly, the efficient memetic algorithm with a new local search procedure is proposed to optimize the problem at each rescheduling point. Five kinds of neighborhood structures are presented in the local search. Moreover, the performance measures investigated respectively are: minimization of the makespan and minimization of the mean tardiness. Finally, several experiments have been designed to test and evaluated the performance of the memetic algorithm. The experimental results show that the proposed algorithm is efficient to solve the flexible job shop scheduling problem in dynamic environment.
Simulation of Stress Changes of Shale Reservoirs during Hydraulic Fracturing to Create Fracture Networks
Authors: Zhang G.M. , Liu J.D. , Xiong C.M. , Liu H. , Jin J.
Published: October 2013

Theoretical studies have shown that the generation of hydraulic fractures reduces or even reverses the stress anisotropy between the fractures and results in increasing the complexity of fractures. A finite element model was established in which the pore pressure element was used to simulate the behavior of porous media and the pore pressure cohesive element was adopted to catch the characters of hydraulic fracture. A special fracturing manner was adopted to create complicated fracture networks by reducing or even reversing the stress anisotropy between fractures. The geometries of hydraulic fractures, strains, stresses, pore pressure distributions and fluid pressures within the fractures are obtained. The results of the model are fit well with the corresponding theoretical data. The simulation results show that the stress anisotropy is reduced resulting from the generation of the hydraulic fracture, multiple parallel transverse fractures of horizontal well further reduce or even reverse the stress anisotropy in some place of the reservoir. The simulation results validate the feasibility of the theoretical studies and the expected complex network fractures could be created by adopting the special fracturing manner.
The Higher Order Axis-Directional Crack-Tip Field for Power FGMs Cylindrical Shell with Reissner's Effect
Authors: Dai Yao , Zhang Lei , Chong Xiao
Published: October 2013

The theory for cylindrical shell with Reissners is adopted to analyze the axis-directional crack problem for FGMs cylindrical shell by using the asymptotic expansion method. The eigen-solution of the crack-tip fields for the cylindrical shell are obtained. The results are similar to Williams solution for the plane problems in homogeneous materials, and will be of wider application to engineering structures.
Application of a Discrete Transfer Matrix Method in Analysis of Acoustic Attenuation Performance of Complex Perforated Pipe Mufflers
Authors: Rui Huo , Bei Meng , Lei Zhang
Published: October 2013

The article is about an application of a discrete method for analyzing acoustic attenuation performance of perforated tube mufflers. Acoustic transfer matrix of a tiny perforated tube section which contains one single hole is deduced based on basic hydromechanics equations. Then the work is developed into a general formula for resolving sound transmission loss of one perforated silencer unit consisting of multiple parallel perforated pipes. Result of the calculation formula is compared with that of acoustic finite element method. One more example is presented on influential factors analysis for noise elimination performance of a practical complex perforation muffler.
Maneuvering Target Tracking Algorithm Based on IMMSCKF
Authors: Hu Jian Wang , Zhou Peng , Xie Hao , Luo Le , He Hou Bo
Published: October 2013

Aiming at the tracking filters are liable to diverge and the tracking precision is low when tracking nonlinear maneuvering target, an Interacting Multiple Model Square-root Cubature Kalman Filter (IMMSCKF) is developed by introducing Square-root Cubature Kalman Filter (SCKF) into Interacting Multiple Model (IMM). This method uses SCKF for filtering each model, the weighted sum of the outputs of all parallel SCKF is taken as the output of IMMSCKF. Simulation shows that IMMSCKF has higher precision, quicker model switching speed, and smaller calculation cost compared with IMMUKF.
Accuracy Reliability Sensitivity Analysis of Power Servo Tool Holder
Authors: Li Chang You , Kang Xiao Chen , Wu Nan , Dai Wen Yuan
Published: October 2013

To analyze the effect of the manufacture and assembly errors on the accuracy reliability of power servo tool holder, the accuracy reliability sensitivity is investigated in this work. The accuracy reliability model of power servo tool holder is introduced firstly. The sensitivity analysis theory of the reliability perturbation method is given. Then, the method is applied to the reliability sensitivity of the power servo tool holder of which the type is SFW25 and the importance order of the manufacture and assembly errors for the accuracy reliability is obtained. It offers the guide for improving the accuracy reliability of the considered power servo tool holder.
The Analysis of Stiffness and Stability of Luffing Jib Cranes Based on Theory of Second Order
Authors: Xue Yuan , Li Jun , Lu Nian Li , Wu Da Qi
Published: October 2013

Luffing jib cranes are large flexible complex truss structure, and their mechanical property is nonlinearity. So the Precise analysis method for the stiffness and stability problem has been paid attention to by the researchers. To solve this problem, the equivalent mechanical model of luffing jib crane was established by taking the lifting load, counter weight and dead weight into consideration. The stiffness and stability of luffing jib crane was analyzed by using the differential equation of deflection based on second-order effect. The calculating formulas of lateral deflection, amplification factor of deflection and stability was derived. Taking a luffing jib tower crane for example, the lateral stiffness was calculated respectively by the formula given by this paper, the traditional linear method and the finite element method, and show that the result calculated by the formula given by this paper is identical to that by finite element software ANSYS, the error is 1.8%. and the error of traditional method is 7.6%, It is clear that calculation expression of lateral deflection, deflection amplification factor and the stability in this paper are accuracy. This method can be applied to the analysis of calculation of luffing jib tower crane stiffness and stability.
Finite Element Analysis for Wave Spring of Multi-Disc Wet Clutch Based on ANSYS
Authors: Yu Ying , Peng Yao Run , Lan Shi Xin , Zhou Ping
Published: October 2013

Wave spring is a key component of multi-disc wet clutch and the response speed and running quality of multi-disc wet clutch is affected by its characteristics. This paper analyses the theoretical calculation of load-deformation relationship of wave spring. The load-deformation relationship of wave spring is obtained by ANSYS10.0 software according to its structural characteristics and actual boundary condition and compared with the calculated results based on different methods and the measured value, and then study the effect of the wave number on the load-deformation relationship of wave spring. The results show that the calculated value of finite element analysis (FEM) is closer to the measured value and the FEM has more advantages on simulation of the working performance of wave spring.
The Structure Design and Exhaust Mechanism on Hybrid Supercharger
Authors: Xiao Hua Pan , Fang Zi Fan , Fang Jing , Li Hui , He Kong De , Yang Wei Hua
Published: October 2013

Aiming at solving the problem of underwater exhaust for underwater vehicle, a new underwater exhaust scheme is presented with structure and power supercharger, which the structure design is analyzed and studied. Firstly, the fluid characteristic is analyzed in junction between the exhaust pipe of diesel and the pressure pipe of air compressor. The connection type of them is presented and the exhaust mechanism is proved that low pressure gas can exhaust out from exhaust pipe by entrainment. Subsequently, based on the Bernoulli principle, the flow distribution is analyzed in the branch pipe. Finally, taking exhaust performance as optimum target, the parameter optimization design is carried out for branch pipe by using DOE; the optimal structure size is also obtained for exhaust pipe by regression analysis. The research result predicts that a new underwater exhaust scheme and its design theory are presented in this paper.
Research of Mechanism and Experiment of 4LZ-3.0 Self-Propelled Pepper Harvester
Authors: Chen Yong Cheng , Kong Ling Jun , Wang Hao Xiang , Li Jun Jiang , Li Rui Min
Published: October 2013

This paper designed a kind of Self-Propelled Pepper Harvester, it introduced the whole structure and working theory, determined the structural parameters of key parts such as picking device, cleaning device, analysed the Mechanism of picking and cleaning, determined the Suspension speed of pepper and leaf. The experiment proves that while the moving speed is 5.3km/h, the rpm of fillip roller is 210r/min, the space between star discs and star axles is 200-220mm, the rpm of star axle is 210 r/min, the airflow speed is 5-8m/s,the picking ratet is 97.1%, the rate of impurities is 9.8%, the mechanization of the harvesting peppers is achieved.
Study on Threat Assessment Based on Rough Ret and Support Vector Machines for Regression in BVR Air Combat
Authors: Wu Ling Yan , Sun Yong Qin , Ji Jin Yao
Published: October 2013

Aiming at the shortage of existing TA methods in BVR air combat, a new TA method based on RS and SVM for regression is advanced, and advantage functions models are structured. Firstly, Missile scope is introduced as a factor of distance, so advantage function of distance is improved. Moreover, advantage functions such as azimuth, enter angle, energy, efficiency are optimized, and goal campaign value is considered as a factor of TA. Secondly, redundancy information of each advantage function is eliminated by reduction of knowledge based on RS, and the final taxis of TA are realized by SVM for regression. Finally, simulation results show the method is rational and effective.
Normal Force Computation for Axisymmetric Multistage Launch Vehicle
Authors: Abbas Laith K. , Chen Dong Yang , Rui Xiao Ting
Published: October 2013

The increased demand upon the aeroelastician to obtain the distributed aerodynamic normal force loads for arbitrary launch vehicle configurations necessitated accurate method. In this work, computational fluid dynamics (CFD) is used for the determining the distributed aerodynamic loads of an axisymmetric multistage launch vehicle in the linear angle-of-attack range. ICEM-CFD and ANSYS-FLUENT software are implemented for the meshing and computational analysis. About 2750 iterations were used for the simulation purpose. Computational results are compared to available experimental data. In general, a good result within engineering error margins is obtained.
Kinematics Analysis of Multi-Functional 4-DOF Mechanical Arm
Authors: Yu Qiang , Liu Xin Rong
Published: October 2013

In order to reduce the complexity of the mechanical arms positive and inverse kinematics equations solving process, find the closed analytical solutions of the inverse kinematics equation quickly and accurately, establish four degrees of freedom mechanical arm positive and inverse kinematics equations based on the four degree of freedom mechanical arms analysis theory and the theory of homogeneous transformation matrices. The kinematics equation gives the relationship of space and posture position between the mechanical arms motion artifacts and the end executor, enabling robotic mission movement according to the predetermined position sequence. In this paper, with a kind of multi-functional mechanical arm as an example, describes the way of building the kinematics model of the articulated robot, which have important reference value to the development of this type of robot system.
Designing and Realization of Differential Pressure Densimeter for Heavy Medium Coal Preparation Based on MCU
Authors: Cao Yi , Zhang Lin , Liu Yi Wen , Zhang Wei
Published: October 2013

The density of heavy-medium coal slurry is a very important parameter and guideposts in coal preparation technique. According to heavy-medium coal preparation processing, the paper designs a differential pressure density meter. It introduces the design principle of the densimeter, the primary instrument and the hardware design of the secondary instrument. But else, it gives an experiences temperature compensation formula and calibration method.
Axial Vibration Analysis of Stepped Bar by Differential Transformation Method
Authors: Wang Zhen Gang
Published: October 2013

Stepped distributed dynamic systems are widely used in the engineering fields, and the dynamic characteristics analysis of them is very important. In this paper, the axial vibration of a stepped bar consisting of two uniform sections is studied, in order to solve the dynamic equation, the differential transformation method is used, the governing differential equation and the boundary conditions of the bar become simple algebraic equations. Doing some simple algebraic operations for these equations, the closed form solution of natural frequency, mode shape and the dynamic response can be obtained. Comparison the results obtained by the differential transformation method and finite element method, excellent agreement is achieved, and the effects of the stiffness of spring is discussed in this paper.
Development of New Type of Visualizer for Point Contact and its Flow Field Analysis
Authors: Song Bao Yu , Sui Tian Yi , Zhang Feng
Published: October 2013

In this article, a new type of visualizer for point contact flow field has been developed. The principle, constitution and application are introduced in details. The flow field of point contact area are captured and analyzed.
Study on Laser Rapid Prototyping of High Thin-Walled Revolved Parts with Variable Diameters Based on Inside-Laser Coaxial Powder Feeding
Authors: Tian Mei Ling , Shi Shi Hong , Fu Ge Yan , Yu Liang Liang
Published: October 2013

The article firstly puts forward an experiment scheme for the study according to the laser rapid prototyping of high-level revolved body accumulate based on inside-laser coaxial powder feeding. And the changes of Z-axis feeding and power regulation in the progress are observed by high speed CCD technology. Then the organization and performance of laser cladding rapid prototyping parts are analyzed. The study shows that the microstructure of the parts is fine and has the characteristics of directional solidification and rapid solidification. The hardness of the parts is better than that of the castings and the ordinary steel parts after heat treatment. The hardness of cladding layers is floated , but there are little differences between each layer.
Numerical Analysis on the Electrical Performance of Microstructured Environmentally-Friendly Electrical Contact Material Ag/SnO2
Authors: Wang Lei , Liu Wei Li , Chen Le Sheng
Published: October 2013

The paper analyzes the influence of structural parameters on the electrical performance of the microstructured environmentally-friendly electrical contact material Ag/SnO2 by using numerical simulation method.The numerical results show that the reisitivity of fiber-like electrical contact material Ag/SnO2 is significantly reduced compared with the resistivity of Ag/SnO2 adding reinforcing nanoparticles in the traditional way.So the fiber-like electrical contact material Ag/SnO2 exhibits higher conductivity in macro. On further analysis, we learn that the resistivity of fibrous electrical contact materials is related to weight percent of reinforced phase, and micro-structural parameter of length to diameter ratio. The resistivity increases as weight percent of reinforced phase increases,and decreases non-linearly with micro-structural parameter of length to diameter ratio increasing.This demonstrates that numerical simulation is one of effective methods for analysis of the electrical performance of the microstructured electrical contact material.
Development of Cast Steel for Brake Disc of High-Speed Train
Authors: Li Ji Shan , Li He Ping , Jiao Biao Qiang , Lv Bao Jia , Chen De Feng , Gu Lei Lei
Published: October 2013

In this paper, based the actual application condition of domestic and international brake disc for high-speed train, the low-alloy cast steel of the brake disc for high-speed train is developed. The chemical composition, melting and casting processes as well as heat treatment technology of disc material are studied. The new low-alloy cast steel has the ideal metallographic microstructure, proper physical and mechanical properties. The tensile strength is more than 1100Mpa in 20°C condition, the impact energy value (Aku2) is more than 8J in-60°C condition. The test results show the new low-alloy cast steel developed can meet the brake disc performance requirements for 380km/h high-speed train.
Research Progress of the Preparation and Application of Low Dielectric Materials
Authors: Wang Ping , Cheng Li Hua , Liang Chao Lin , Zhao Jian Qing , Jiang Zhi Jie
Published: October 2013

This paper is about the preparation of polymer/hollow silica spheres composites with outstanding performances such as high thermal conductivity, low dielectric constant, low dielectric loss, thermal stability ,etc. And the obtained composites are mainly used in high-frequency circuit substrate, packaging materials and connector materials and so on. Research the preparation technology of a new high-stability low-loss dielectric polymer nano-composite materials, get the experience of design and characterization of materials and explore the law of structure and dielectric properties of materials, it is great value for the development of the new polymer materials and new products in electronic information industry.
The Preparation and Characteristic of PNIPAAm/ Hydrogel Nanocompounds by Radiation Techniqus for Bone Filling Materials and its Cytoxicity
Authors: Wu Te Hsing , Lin Hong Ru , Shen Lie Han
Published: October 2013

In the paper, high strengthened poly (acrylic acid) NMBA poly (N-isopropylacylamide) (PAA-NMBA-PNIPAAm ) hydrogels were prepared by UV light or γ-ray irradiation method for scaffold material use and application. And the double network (DN) hydrogel can be used as a substitute for nucleus pulposus. The absorption peaks on FTIR show the evidence for the successfulgrafting of PAA-NMBA-PNIPAAm hydrogel material through radiation co-polymerization.The mechanical property assay indicate that the maximum compressive strength of this hydrogel was significantly increased to ~22 MPa when PAA incorporated with both PNIPAAm and NMBA. We also studied the cytoxicity of hydrogels. The results obtained that these composites are more compatible and they they are fitted to appling for biomedical materials.
Similar Constructing Method for Solving the Model of the Plane Radial Flow of Dual Permeability Reservoir
Authors: Fan Cong Yin , Li Shun Chu , Gui Dong Dong , Hu Ming , Li Hui Chun
Published: October 2013

A seepage model of producing at a constant rate, based on the three outer boundary (infinite, closed, constant value) conditions and regardless of the well-bore storage and skin effects, is established for the problem of the plane radial flow of dual permeability reservoirs. Firstly, we get dimensionless model by introducing the dimensionless variables. Second, we obtain a boundary value problem of ordinary differential equation in the Laplace space by using the Laplace transformation. Finally, we prove that the solution to the boundary value problem has similar structural formula. Therefore a new method for solving such seepage model is obtainedSimilar Constructive Method (shortened as SCM). And then, according to the modified numerical inversion formula of Stehfest, we draw the curves of bottom-hole under the three kinds of outer boundary conditions by using MATLAB.
Visualization of Mach 3.0/3.8 Flow around Blunt Cone with Supersonic Film Cooling
Authors: Zhu Yang Zhu , Yi Shi He , Tian Li Feng , He Lin , Chen Zhi
Published: October 2013

Fine instantaneous flow structures of different scales around a blunt cone with or without supersonic film cooling were visualized via nanotracer planar laser scattering (NPLS), which has a high spatiotemporal resolution. The Mach number of the freestream is 3.0 and 3.8 respectively and the air injection is at Mach 2.5. Lots of typical flow structures were visible clearly, such as shock wave, expansion fan, shear layer, mixing layer, K-H vortices and turbulent boundary layer. With injection, the model wall surface can be covered by a thin film layer. While no injection, the flow is similar to the supersonic flow over a backward-facing step and the structures are simpler relatively and there is a longer laminar region. Flow structures with or without film cooling at Mach 3.0 and 3.8 were compared.
Fisher Discriminant Analysis Predicted Model of Criticality of Karst Water Disasters from Coal Seam Floor and its Application
Authors: Qiao Wei
Published: October 2013

Based on Fisher discriminant theory, the Fisher discriminant analysis (FDA) model was estabilished for forecasting the criticality of karst water disasters from coal seam floor. Five factors were selected such as mining level, digging length, hydraulic pressure, thickness of water-resisting layer and fault throw as the discriminant factors of the FDA model. A series of experimental data of water inrush from coal floor were taken as the training and testing samples, then some other practical data were used to verify this model. The results show that the FDA model is a simple, feasible and high accurate prediction method. It can provide a new way for mine water prevention and control to predict water disaster.
Typical Errors Analysis in Frequency Response Function Measurement
Authors: Zhou Jun Wei , He Lin , Xu Rong Wu
Published: October 2013

FRF measurements can suffer from various errors. The effect of deterministic errors become more prominent compared to random errors in FRF measurement. Excitation and sensor misalignment is the most common source of deterministic error, so mathematic model is established and the effect on FRF estimation was analyzed for senor and excitation misalignment situations. Finite element model simulation reveals that misalignment error can have the least effect on the dominant FRFs and a stronger effect on lesser FRFs, beside that it also results in the appearance of false peaks in the measured FRFs.
Optimal Design of Grinding Temperature Measurement Platform Based on Improved Thermocouple in Production
Authors: Li Rong Bin , Cui Can
Published: October 2013

A new grinding temperature measurement platform based on thermocouple is combined with improved thermocouple in production, data acquisition card and procedures compiled by LabVIEW.Experiments of grinding temperature measurement on 45# steel were done on this platform.The purpose of these experiments is to prove this platform accurate by comparing theoretical temperature with experimental temperature measured according to different parameters.
The Noise Analysis of Fluid Systemsin Solid-State Nanopore Sensors
Authors: Ying Song , Wang Lei , Zhao Wen Yuan
Published: October 2013

The solid-state nanopore sensor offers a versatile platform for the rapid, label-free electrical detection and analysis of single molecules, especially on DNA sequencing. However, the overall signal-to-noise ratio (SNA) is a major challenge in sequencing applications. In our work, two different fluid systems made by metal and plexiglass have been designed to improve the signal to noise ratio of the solid-state nanopore sensor. From the measurements on the noise power spectra with a variety of conditions, it is found that plexiglass fluid system coupled with shielding box produces a good quality of electric signals on nanopore sensors.
Research and Implementation of the Retrieval System Based on Texture and Shape
Authors: Tu Zhong Wen , Wang Ke Min , Dong Yue , Zhao Yu
Published: October 2013

Content Based Video Retrieval (CBVR) is becoming a hot research topic. We lay a strong emphasis on the research of texture and shape character pick-up algorithm and retrieval technology, explain the meaning of the parameter of Gray-Level Co-occurrence Matrix, and compare the result of three algorithmCanny, Laplacian and Sobel. The article selects Canny and Gray-Level Co-occurrence Matrix in this system. The experiments show that the performance of the retrieval system based on texture and shape is related with each other, especially in searching the image with typical texture and shape character.
Finite Element Modeling of Sound Transmission Based on Micro-Computer Tomography for Human Ear
Authors: Tian Jia Bin , Ta Na , Rao Zhu Shi , Xu Li Fu , Huang Xin Sheng
Published: October 2013

An accurate finite element (FE) model of the human ear can help in understanding the physiological mechanismof human ear and facilitate the design of implantable hearing devices. In this paper,a FE modelof the human ear consisting of the external ear canal, middle ear, and cochlea was developed. The geometry of the external ear canal and middle ear model was based on a fresh specimen of human temporal boneviamicro-computer tomography imaging. A harmonic sound pressure of 90 dB SPL was applied in the ear canal and the multi-field coupled FE analysis was conductedamong the ear canal air, cochlea fluid, and middle ear and cochlea structures. The results were compared with the established physiological data. The satisfactory agreements between the model and published experimental measurementsindicate the middle ear and cochlea functions can be well simulated and further application in terms of human ear can be achieved by the model.
Dual-Channel Measurement System for Real-Time Ethernet
Authors: Jin Dong , Zhang Cheng Rui , Hu Tian Liang , Hou Ming Jiang
Published: October 2013

Real-time Ethernet (RTE) is widely used in industrial automation and high performance motion control field. Its minimum cycle time is down to less than 100μs and cycle jitter is less than 1μs, making many existing network and protocol analyzers cant meet the requirements of time accuracy in measurement system for RTE. In this paper, a low-cost and open measurement system is proposed to analyze the time characteristics (cycle time, cycle jitter, end-to-end delay, etc.) and protocol (Ethernet type, length, detailed info, etc.) of real-time Ethernet. The measurement system is consisting of a FPGA-based hardware device and a PC-based monitor station. The hardware device has dual channels that allow detecting two nodes data frame simultaneously. Ethernet data frames through channels are transmitted immediately; at the same time, all data frames will be duplicated and sent to the monitor station with precise timestamp for frame analysis. A prototype of measurement system has been realized to verify feasibility and performance. Result of the experiment shows that the maximal delay time brought in by measuring device is only 120ns and the accuracy of time stamp is down to 5ns; the parser is created in the monitor PC for analysis the time characteristics and protocols of real-time Ethernet.
Research on the Low Velocity Accuracy Control of the Direct Drive Volume Control Electro-Hydraulic Servo System
Authors: Wang Jing Fu , Liang Li Hua , Wang Lu Yang
Published: October 2013

The Direct Drive Volume Control (DDVC) Electro-hydraulic Servo System is a new Electro-hydraulic Servo System. With the development of its application, how to improve the trajectory tracking precision of the DDVC system in low velocity motions becomes more important in the field. So that, the level of the low velocity characteristic impacted the system become to an important subject. In this paper, the mathematical mode of AC asynchronism motor Direct Torque Control was established, and the simulation mode was built. In addition, the idealized model of the DDVC system which based on united simulation of AMEsim/Simulink was established, simulation was executed. In order to make the research available, the low velocity characteristic of the DDVC system was also analyzed, and the low velocity characteristic simulation model was built. Computer simulation validated that the friction is seriously influenced the system performance when the system working on the low velocity mode. An integral back stepping adaptive control law is designed to realize the friction compensation and load disturbance estimation. From the Lyapunov theory, the stability of the closed-loop system is proved. Simulation results show that LuGre friction in servo systems will lead to the effect of limit cycles and stick-slip. Moreover, the proposed compensation method can greatly reduce the effect and improve the system tacking accuracy and robustness.
Hierarchical Intelligent Alignment Control of Air Spring Vibration Isolation System of Ship Propulsion Plant
Authors: Bu Wen Jun , Zhao Ying Long , Shi Liang
Published: October 2013

Alignment control of propulsion plant air spring vibration isolation system is a complicated Multi objects control problem. In this paper a new hierarchical intelligent control method of alignment control is brought out. Known from current hierarchical intelligent control methods with three layers, this method consists of task layout layer, control decision-making layer, control layout layer and control executive layer. The complicated alignment control task is decomposed into four hierarchical layers to reduce complexity. The control system has good control convergence capability and fast convergence speed. Test results validate the feasibility of this method.
Gantry Crane Dynamic Modeling and Motion Control
Authors: Du Wen Zheng , Xie Zheng , Lu Fei , Cao Yuan
Published: October 2013

In this paper, a new anti-swing control scheme is proposed for a three dimensional gantry crane. The proposed control is based on linear two optimum output regulation technology. The proposed control guarantees not only prompt suppression of load swing but also accurate control of crane position for simultaneous travel, traverse, and hoisting motions of the crane. Furthermore, the proposed control provides practical gain tuning criteria for easy application. The effectiveness of the proposed control is shown by simulation with a three-dimensional gantry crane.
Research on the ECAS System Model and Control Strategy
Authors: Zhang Xi Jin , Li Hong Yan , Fang Zong De , Wang Mao Ting , Pan Jing Wen , Li Chao
Published: October 2013

Tractor SX4187NT361K, which is manufactured by the Shaanxi Automobile Group Limited Corporation, is regarded as a prototype vehicle. This paper investigates an 1/4 car model with air springs for the tractor and a working model of air spring. A height PID control method for ECAS is designed, and its digital simulation is conducted. An ECAS test-bed is designed, and hardware of a measurement and control system for the test-bed is designed with DSPACE system, its softwares are also designed with Simulink and ControlDesk. Finally, active and passive tests of the ECAS are conducted through changing frequencies and desired heights, simulation and test results show that the PID height control method for ECAS is feasible.
The Study of Wireless Network Communication in the Monitoring System of Stage Hydraulic System
Authors: Gao Xia , Tu Zhong Wen , Dong Yue , Wang Ke Min
Published: October 2013

The article firstly discusses the stage of the hydraulic system of monitoring and control system of wireless sensor network application system research, this topic mainly studies based on the development of radio frequency chip CC2530 suite ZigBee2007 wireless sensor network technology and the based on the Z-Stack. Monitoring of hydraulic system of hydraulic pressure and flow in the system and measure the pressure of their joint sensors This topic also studied the mobile terminal on the PC hardware acquisition data software monitoring platform, has realized the pressure and flow rate data, real-time display and data of the dynamic curve drawing, more intuitive, and when the pressure and flow rate is in excess of the normal range, an alarm to remind staff to handle in time, to prevent the accident, to ensure the safety of stage hydraulic system's normal use.
The Design of Hopping Angle Control by Using PID and LQR Techniques
Authors: Samo Saifullah , Ma Shu Yuan , Sameh Bdran
Published: October 2013

It is very difficult for hopping robots to follow the trajectory without controlling hopping angle. A hopping angle controller is designed for combustion piston type hopping robot to adjust the angle of hop which is required to achieve a desired distance or height. So, the controller adds functionality to hopping robot for altering the hopping angle during operation according to obstacle height and obstacle distance. A proportional Integrated Derivative (PID) and Linear Quadratic Regulator (LQR) are designed and compared for adjusting hopping angle by using MATLAB / SIMULINK environment. As result, both controllers are capable to control hopping angle but PID gives better performance. An implementation of PID controller for the hopping angle control is given by using a DC motor. The experiment also carried out on prototype by using PID controller and found satisfactory results.
Temperature Rise Model of Drum Brake
Authors: Guo Ying Shi , Wang Chang
Published: October 2013

In order to analysis the temperature rising rules of vehicle, road conditions and vehicle running state were considered. Process of friction heat generation, radiation heat and convection current exchange during drum brake working process was researched, and temperature rising model of drum brake was established. Under the guidance of similarity theory and dimension analysis theory, convection current heat exchange test of drum brake was carried out, and the solution equation of convection current heat exchange was obtained. Real road test results shows that the temperature rising curves between calculations and test are basically identical and the maximum inaccuracy variables approximately 20%.
Adaptive Fuzzy PID Controller of a Master-Slave Robotic Catheter System in Minimally Invasive Surgery
Authors: Zhao Xi Mei , Jiang Ming Ming , Li Hong Yi , Liu Hao
Published: October 2013

Minimally Invasive Surgery (MIS) is a good choice to treat cardiovascular disease. However, the accuracy of catheter manipulation is limited by the doctor, and the X-ray damages the health of the doctors. A master-slave Robotic Catheter System (RCS) can solve the disadvantages of the traditional catheter intervention surgery. PID controller has been widely used in the master-slave RCS. However, Traditional PID controller used in the master-slave RCS will cause large overshoot or poor stability. An adaptive fuzzy PID controller can adjust the PID parameters online, reduce the overshoot, and improve the tracking performance of input signal. In this study, the dynamic model of the axial and rotational motion is presented. An adaptive fuzzy PID controller is proposed to improve the performance of the master-slave RCS. Simulation results show that the proposed controller is more effective than the traditional PID control, and the robustness is also improved.
Zero Phase Robust Control of XY Table Linear Servo System
Authors: Zhao Xi Mei , Jiang Ming Ming , Li Hong Yi , Liu Hao
Published: October 2013

For direct drive XY table servo system, position control is designed. Considering the error which is caused by the disturbance of the system, friction factor and so on. The control method combing the zero phase error tracking controller (ZPETC) with the disturbance observer (DOB) is adopted. The system tracking error is reduced by adopting ZPETC, and through influences of disturbance to the system is diminished by the disturbance observer. Thus the tracking accuracy and robustness of the system are improved. Simulation results show that this control scheme is effective. It can obviously improve the accuracy of the system.
Control Module of 3D Camera Pan Tilt Zoom
Authors: Bao Nan Hai , Liu Yi , Dong Yue , Pan Yue , Xiao Huai Yu , Wang Chun Zhi , Zhao Yu , Zhang Xin Xiang , Xu Liang
Published: October 2013

In order to solve the low precision and difficult to sync, when the manual regulation of 3D Camera PTZ (Pan Tilt Zoom).The paper studies a 3D camera design (dual lens, horizontal support), and realize the remote control of double horizontal movement. The control module of the design based on single-chip stepper motor control theory, which can use the remote wireless remote control to it, and it has the high application value.
Coal Transport Tape Control System Based on Machine Vision
Authors: Yuan Jing , Liu Yin Xia , Shao Shu Hua
Published: October 2013

Coal transport security is one of the important links of mining safety in production chain. Most of Mines use long distance wire rope core belt conveyor transporting coal. By the reason of the load increases, the belt surface scratches and aging etc when the transmission belt in the long run, will cause the wire rope core corrosion, fracture, joint elongation, wire rope core and transmission belt adhesion decreased and finally the joint tensile fault. Once a fault occurs, the transmission security not only endangers mine, even causes the entire production system halted, so the security warning mechanism of coal transport tape proposed must be enforced. Article using machine vision and online transmission detection combined. In the first field observation, using the high accuracy linear array CCD real-time transmission of high-speed operation with the image acquisition and image processing threshold; Though extraction algorithm, simulation experiment and field test; finally comprehensive analysis gives the early warning scheme. The project mainly studies the transmission belt blob spot detection and algorithm with wear, based on digital image, image coding and image enhancement, compared the collected image speckle with set threshold so as to determine which set of real-time image for pre-alarm wear spots, mark the spot coordinates, at the same time to upload data in order to complete the transmission belt warning. The project solves the influence of transmission tape failure of coal production effectively.
Analysis of SKF Linear Actuator Application
Authors: Zuo Wen Tao , Liang Guang Yan , Li Hao
Published: October 2013

In this paper, it introduces the versatile advantage and technical characteristic of SKF linear actuator. It points out that SKF linear actuator is an ideal solution to meet mechatronics application where energy saving, environment protection and precise control are required. The paper also introduces the methods of SKF linear actuators selection and brings inspiration and enlightenment for machine optimized design and trouble free operation.
Formation of Multiple-Robots Using Vision Based Approach
Authors: Baasandorj Bayanjargal , Reyaz Aamir , Battulga Batmunkh , Lee Deok Jin , Chong Kil To
Published: October 2013

Multi-robots system has grown enormously with a large variety of topics being addressed. It is an important research area within the robotics and artificial intelligence. By using the vision based approach this paper deals with the formation of multiple-robots. Three NXT robots were used in the experiment and all the three robots work together as one virtual mobile robot. In addition to these things we also used TCP/IP socket, ArToolKit, NXT robot, Bluetooth communication device. And for programming C++ was used. Results achieved from the experiment were highly successful.
Welding Robot Welding Process Research and Development of Intelligent Technology
Authors: Yi Ji Ming , Han Min
Published: October 2013

The welding direction of robot and existing problems, the groove plate is difficult to realize automatic welding robot problem, methods using laser sensor and a binocular vision system combines, image and depth information extraction plate groove groove, realize accurate 3D reconstruction.
Design of Cooling System for Infrared CCD Camera Used to Monitor Burden Surface of Blast Furnace Based on Thermoelectric Coolers
Authors: Wang Li Qiang , Zhou Li , Fan Hai Tao
Published: October 2013

A temperature control system based on thermoelectric coolers is designed in this paper for infrared CCD camera used to monitor burden surface of blast-furnace. The thermoelectric cooling system consists of a microcontroller module, a temperature sensor, a CCD camera, a thermoelectric cooler, a power amplifier and isolation module. The CCD camera with a temperature sensor is tightly mounted on the TEC cold surface. The microcontroller changes duty ratio of PWM signals with changes of the camera temperature to make working temperature of the CCD camera constant. The experiments show that the cooling system works well in temperature controlling
The Research on Check Calculation of Pipe Supports in Nuclear Power Plant
Authors: Liu Hong Lin , Wang Yan Pu
Published: October 2013

Pipe supports are an important part of the technology system pipeline in nuclear power plant. This paper takes pipe supports of LING AO II nuclear power plant (M310 reactor) as the object, the strength, stiffness calculation of assembly parts in several commonly used pipe support, and the rooting point validation are studied.
Decision Analysis of Lane Change Based on Fuzzy Logic
Authors: Shi Wen , Zhang Ya Ping
Published: October 2013

Aiming at the complexity of lane change process, fuzzy logic analysis method was proposed to analyzing this behavior. By assaying the multi lane change scene that the drivers may choose, influencing factors were quantified. Each indicator factor after quantified was treated as model input. PID models of driver, vehicle and road surface were established in Simulink condition. The road surface model controls whether the lane change process will be conducted, and the driver model will export angle of steering wheel to deciding the efficiency of lane change process. Real road test was conducted and the test result shows that information between human and vehicle can be fused sufficiently.
VA One Applied in the Noise Control Numerical Simulation of an Indoor Substation
Authors: Xu Rui , Mei Zhong Min , Mei Tian Long , Yu Ting Fang , Wu Jing Ping , Fan Hong
Published: October 2013

Due to the city indoor substations have caused serious noise pollution to the environment, a compatible model has been established to simulate the sound field at the main transformer chamber of a substation indoor and outdoor. Appling the software VA One, based on statistical energy analysis method, the sound filed of one 110kv substation transformer chamber in Nan Chang is taken as an example. Make appropriate noise control program according to the simulation results. Found that the sound pressure level, after reforming the inlet position, has met the requirements compared with the one before. The pressure level conforms to the requirements of the Urban Regional Environmental Noise Standards. Verify the rationality and reliability of the model and method.
The Aero-Thermodynamic Effect Simulation Study of Solid Motor Grain
Authors: Pan Wen Geng , Li Tao , Bian Guang Rong , Cao Jin Rong
Published: October 2013

The long-stored missile as a result of environment temperature stress functions and so on, it will cause the missile material aging. For high-speed flight's missile, thermal coefficient of expansion between the different structural and element will be different simultaneously, when the aerodynamic heating will produce, the grain and the thermal insulation layer will also be appeared the crack phenomenon in the influence of expand with heat and contract with cold rules. For the example of some infra-red missile, aero-thermodynamic effect of the missile is carried on the forecast using the ANSYS software simulation, it has the important meaning to analyze the storage performance and failure mechanism of flying missile and so on.
Simulation of Pollutant Transportation in Yinluan Open Channel under the Effects of Wind
Authors: Zhang Chun Xue , Liu Wei , Wang Li Lin , Wang Chao , Yang Shu Yi , You Xue Yi
Published: October 2013

The water diversion project from Luanhe River to Tianjin is a large-scale project eliminating the water shortage of Tianjin city. Because the long water supply open channel along highroads, the traffic emergent incidents bring great potential dangers to the water supply of Tianjin. In this paper, the prediction model of traffic emergent incidents was built and the transportation of pollutants in Yinluan open channel with the effects of wind was simulated by EFDC model. The evolution and affective area of pollutant in Yinluan open channel was obtained. The results showed that the effects of wind on the transportation of pollutant in Yinluan open channel are strong when the wind direction is along the channel.
Mechanism of Debris Flows in Mountain Streams
Authors: Kou Chang Huan , Ma Shih Wei , Lai Meng Wei
Published: October 2013

This paper suggests the mechanism of occurrence of debris flow in mountain streams. It is found that the sliding of the undermined stream banks follows the exponential probability distribution function. This indicates that the major amount of debris is from an intensive sliding in the initial stage of flood flow development. This can be otherwise proved by the viscous flow boundary layer theory such as the shear stresses on the wall are initially very large. Through a relative dimensional analysis, a special dimensionless parameter K is grouped which has a very important effect on the occurrence of the acceleration of the heavy debris by the flow. It interprets, during the flood flow development, the amount of debris on the stream bed can only be accelerated when the kinetic energy of the flow is greater than the apparent work of the debris against the flow. Of course, as a transient behavior, once it starts, the sudden acceleration of a huge amount of debris flow bore will usually cause an unpredictable downstream disaster.
The importance of a patient’s background in formulating a management approach
Authors: Ojha Anil , Shrestha Pawan , Green David A.
Published: October 2013

Peptic ulcer disease is uncommon in childhood, with non-specific clinical features. A tendency to late diagnosis makes it more likely for a patient to present with complications. Here we discuss a child with low socio-economic status from a developing country who presented with severe anemia secondary to a bleeding duodenal ulcer. The case highlights the importance of the patient’s background in the formulation of a management approach. In some cases this may be intuitive to an experienced physician. However, we demonstrate this with a simple mathematical diagnostic model using disease prevalences which are tied to our individual patient’s circumstances. The model shows how the negative predictive value of a test can change according to the patient’s background. We also suggest that the best treatment option will be influenced by the patient’s circumstances. Our patient comes from Nepal, but the principles involved are universally applicable.