bluuebunny/crossref_metadata_2025 huggingface dataset:
A Rotor Time Constant Identification Method with Compensation Algorithm
Authors: Bian Chun Yuan , Cao Rui Xia , Man Yong Kui , Song Chong Hui
Published: October 2011

In the vector control the time constant of rotor changes will affect the system, generally required online identification. This paper puts forward a identification method based on model reference adaptive, using popov exceed stable to design a adaptive rate. Analyses identification system by torque effects, and proposes a kind of compensation algorithm, to improve the system robustness. Under the MATLAB/Simulink environment build simulation model to verify the correctness of the algorithm, and points out the advantages of compensation algorithm.
Chance Constrained Model Predictive Control Based on Set-Valued Optimal Algorithm
Authors: Cao Yan , Wu Jun
Published: October 2011

This paper adopts one kind of classical predictive control, namely model algorithmic control, to control the distillation process. Due to finite cognition degree for the distillation system and existence noise in the chemical industry, we present a chance constrained model predictive control algorithm to eliminate the effect of parameter pertubation and noise. In view of the linear impulse response model, we introduce set-valued optimal algorithm and orthogonal standardization method to transform the chance constrained model predictive control to a general model predictive control problem. For the determinate MPC, efficient quadratic programming exsits to solve such problem. Applying such controller to a distillation system, output constraint condition will be satisfied with a predefined probability.
Based on Atmege 16 Mixed Hybrid Automobile Demonstration System Design
Authors: He Tao , Bai Ya Shuang , Xu Wen Juan
Published: October 2011

Hybrid automobile is pointed as the automobile with two kinds of power sources which include fossil energy supply and battery power source. According to the throttle sensor and wheel speed sensor, the working of the mixed hybrid automobile is divided into several conditions as follows : starting , working at low and moderate speed, working at high speed ,working at full speed and acceleration, braking with energy regeneration. In this paper the mixed hybrid vehicle demonstration system is designed. And it mainly concerns the structure and principle of the mixed hybrid vehicle demonstration system,and discusses how to design the hardware and software system based on atmege16, the results of circuit simulation shows that the demonstration system can effectively show the working of the mixed hybrid vehicles through three order flows of the LEDS.
The Search on Ethanol Fuelling for Compression Ignition Engine
Authors: He Tao , Zhao Qiu Fang , Zang Ji Song
Published: October 2011

Along with the rapid economic development in China, productions and sales of automobiles are growing at a high speed .The rapid development of the car market and the large increase of auto possession brought a huge demand of oil resources .The high external dependence has affected our country's energy security. The application of diesel blended the ethanol can ease the oil shortage, reduces atmospheric environment pollution and helps to realize sustainable development strategy of our country. This paper mainly conducts the research on diesel engine with ethanol fuelling, experimentally studied and analyzed the influence of ethanol blended diesel on the dynamic performance, economy performance and emission performance. The results show that Ethanol blended diesel can partially substitute diesel and effectively reduce the harmful pollutants while keeping the same power and economy.
External Gear Pump Model and Simulation
Authors: Wang Hui , Du Sha Sha
Published: October 2011

This paper describes the development of gear pumps and the main causes of noise,and establish the overall dynamic model of external gear pump,mainly including the trapped oil model,the gear mesh model and the shell model and then go on with simulation analysis and research.Through establishment the gear pump model,it is benefit for predicting the gear pump trapped oil pressure and studying the impact of parameter changes on the pressure,and getting the natural frequencies and model shapes of the gear pump structural system,so that we can analysis external gear pump vibration and assess gear pump design optimization,while helping to find the effective measures to control gear pump noise and ease trapped oil phenomenon.
Research of Thermal Analysis Collaboratively Using ANSYS Workbench and SolidWorks Simulation
Authors: Peng Ying
Published: October 2011

This paper introduces the basic theory of thermal analysis and the use of SolidWorks Simulation and ANSYS Workbench to complete the steady-state thermal analysis about related models, thus getting steady temperature distribution of the model. By comparing the differences between SolidWorks Simulation and ANSYS Workbench, we can finally work out the optimal method for product design and simulation .
Analysis and Improvement of the Diesel High Pressure Oil Pipe Based on ANSYS
Authors: Zhao Qiu Fang , Xing Jian Qiang , He Tao , He Ao
Published: October 2011

The rupture of high pressure oil pipe is a typical fault of six-cylinder diesel engine. In this paper, the influence of the size of oil pipe corner and the application of pipe clamp on the vibration are studied. An improved design is proposed through modeling based on ANSYS. The result shows that the improvement obviously decreases the amplitude and average of vibration and enhances the anti-fatigue property and the reliability.
Mechanical Product Analogy Design Method Based on Structure Similarity
Authors: Nan Peng Cheng , Xu Jing
Published: October 2011

By use of function-behavior-structure-shape model, an analogy design method for mechanical products based on structure similarity is presented. Structure model includes qualitative models of symbol part structure and product assembly structure. It is an information carrier to connect conceptual design and detail design. The main aim to set up structure model is to realize design reuse. By use of the structure similarity between source design and target design the product design is picked-up. The 16 types of design processes based on analogy are present. Finally structure design modeling is divided into three levels, namely symbol modeling, structure modeling and feature modeling. The structure hierarchical modeling method is discussed.
Simulation of Disc Cutter Loads Based on ANSYS/LS-DYNA
Authors: Li Xiao Huo , Du Wei , Huang Zhi Long , Fu Wei Li
Published: October 2011

In order to solve serious damage of pick on part-face tunnel machine during hard rock cutting, explore the applicability of disc cutter on the machine, the structure of disc cutter was designed, a model of dist cutter was built with Pro/E software, finite element model was established in ANSYS/LS-DYNA, the vertical force and rolling force of a disc cutter were obtained by simulation of cutter cutting. Analysis shows that the disc cutter can cut granite whose hardness is 106.2MPa, so the disc cutter can cut hard rock. The vertical force and rolling force agreed with common prediction formula of disc cutter forces which showed that modeling method is correct and feasible, this paper lays the foundation for the design and development of a cutting head of hard rock roadheader.
Finite Strain Analysis of Crack Tip Fields in Yeoh-Model-Based Rubber-Like Materials which Are Loaded in Plane Stress
Authors: Wang Zhi Yu
Published: October 2011

The dominant asymptotic stress feild near the tip of a Mode-I crack of Yeoh-model-based rubber-like materials is determined. The analysis bases on the fully nonlinear equilibrium theory of incompressible hyperelastic solids. First, The nonlinear PDE (partial differential equation) governig the leading behavior of y2 is transformed to a linear PDE. Then the linear PDE is solved and the solution of y2 is obtained. With the solution of y2 and boundery conditions the numerical solution of y1 is obtained,too.Finally,the analysis solution in polar coordinate of the first Kirchhoff Stress in plane stress state is obtained .
The Research of the Power Supply System of Embedded Portable Devices
Authors: Cheng Wei
Published: October 2011

Portable devices are mostly powered by battery. With the products tending to the direction of light, thin, short and multi-functional integration, the power requirements of portable devices are increasing all the time, but the energy density of battery is far behind the speed, the improvement of performance relies heavily on the power management technology. Therefore, it’s needed that manage the power of whole system with the integrated viewpoint to reduce power consumption and extend the system work time. After the analysis and research for power management technologies, one kind of a combination of hardware and software power management solution is proposed. The power management IC with embedded Linux operating system's Dynamic Power Management technology, better to reduce system power consumption, meets the requirements of the power system supplied by portable equipment.
An Analysis of the Effect of Feedstock on Continuous Extrusion Forming Process
Authors: Chen Li , Song Bao Yun , Liu Yuan Wen
Published: October 2011

Continuous extrusion is an advanced process for manufacturing copper strip. Its successfully industrial application is to manufacture copper strip. Based on finite element method (FEM), using the Deform-3D software, this paper simulates continuous extrusion forming process for copper strip, and analyzes the effect of different feedstock diameter on metal flowing temperature, effective stress, velocity, rotating torque. The results show that: feedstock diameter greatly affects the continuous extrusion forming process; Under the same rotating speed, as feedstock diameter increases, the metal flowing velocity increases. It is benefit to enhance the productivity; As feedstock diameter increases, the temperature of the billet and tooling increases, and the torque of extrusion wheel increases, which leads to tooling wear seriously.
Using Ontology and Rule-Based Reasoning for Supporting Automatic Process Plan for Milling Prismatic Parts
Authors: Vang Tran Anh , Jiang Ping Yu
Published: October 2011

Nowadays, the manufacturing enterprises are in a highly dynamic environment because of the continuous changes of market. Therefore, the integration of product’s data and manufacturing data are paid much attention of researchers due to its role in improving the reliability and flexibility of manufacturing process. In this paper, we present a new approach of using ontology and rule-based reasoning to support this integration. Contributions of this research consist of establishing an architecture of semantic CAPP system (s-CAPP), using OWL (Web Ontology Language) and SWRL (Semantic Web Rule Language) to describe the information of machining parts and manufacturing equipments, presenting the definition of feasible process plan through rule-based reasoning with SWRL and JESS, and giving a case study on s-CAPP system.
A “Flow” Based Method for Knowledge Mining and Visualization of Patents
Authors: Sheng Qing , Hou Wen Jun , Wang Xi Meng
Published: October 2011

Patent knowledge mining and reusing have become one of the shortcuts during the conceptual design. However, in fact, it is difficult to obtain the deep function and principle knowledge which are the most important part for conceptual design through the existing knowledge mining method. Therefore, this paper established a method of knowledge mining and visualization of patents based on the "Flow", through which the designer can improve the efficiency of knowledge acquisition, find the hidden principle of innovation, and promote innovation finally.
Knowledge-Based Classification Method for Urban Area Objects Feature Extraction Based on LIDAR Points
Authors: Xu Hong Gen , Li Ting , Wu Fang
Published: October 2011

Laser scanning technology can quickly capture a large area of high-precise 3D spatial data, and get the information of buildings, roads, vegetation and other urban objects from raw data. Based on this information general frame of these objects can be modelling. In this paper, an object-based classification method is proposed for urban objects based on LIDAR points: determine the contents of the objects contained in the scene; extract inherent features of different objects; establish objects feature knowledge database; combine and compare objects’ features and distribution of LIDAR points; derive a set of rule to express the point cloud classification which can be received by computer through fuzzy judgement. The method has been applied to LIDAR points by LYNX. The experiment results show that the proposed classification method is promising and usable.
Modeling and Simulation of a Novel Hydraulic Disc Brake for Truck-Mounted Drilling Rig
Authors: Wu Xiu De , Liu Wei
Published: October 2011

Hydraulic disc brake is essential for meeting the requirements of safety and economic efficiency during drilling and work-over procedure. To address this need, we have developed a programmable logic controller controlled novel hydraulic disc brake system with capability to apply control strategy similar to anti-lock braking system for hoisting system of truck-mounted drilling rig. This paper is to investigate the complicated interaction between the work clamp and the hydraulic control system. So designers can use this model to decide which control strategies are more suitable for the disc brake. This is demonstrated by modeling the advanced hydraulic system and simulating influential factors on dynamic characteristics of hoisting system disc brake, with the application of the Advanced Modeling Environment for Simulations of Engineering Systems. The method of modeling and simulation provides a simple, effective approach to studying hydraulic disc brake for hoisting system.
Simulation and Analysis on Vehicle Frontal Crash Based on Virtual Proving Ground
Authors: Chen Ke , Tong Xue Feng , Wang Xin Fang
Published: October 2011

Based on the vehicle crash finite element theory and the virtual proving ground (VPG), vehicle frontal crash is simulated. Under the VPG environment, the unit element meshes are determined for the entire vehicle CAD model, whereas the element types and material parameters, together with welding nodes, contacts and constraints are defined. According to the ECER94 safety regulations, a rigid wall model, along with initial crash conditions is established. By calling the LS-DYNA, the simulation model is calculated and the stress distribution, vehicle body aberration nephogram, energy and acceleration curves are attained. Afterwards, the vehicle crash safety performance is obtained through simulation. Therefore, this approach sets a reference for vehicle mass assessment.
Eye Statement Recognition for Driver Fatigue Detection Based on Gabor Wavelet and HMM
Authors: Yang Hai Yan , Jiang Xin Hua , Wang Lei , Zhang Yong Hui
Published: October 2011

Eye statement is one of the most important factors reflecting driver fatigue. A novel eye statement recognition method for driver fatigue detection based on Gabor transformation and Hidden Markov Model is proposed in this paper, in which, the eye detection algorithm is borrowed from Zafer Savas' TrackEye software, and Gabor features, i.e. the eye state features, of the eye are extracted by using Gabor wavelet. After that, by using these features, the classifier is trained by HMM (Hidden Markov Model) to distinguish the eye states including fatigue and alert, then the consecutive five frames are considered to judge whether there exists driver fatigue or not. Simulation results show that the new method has good accuracy and effectiveness.
The End-Point Ingredient Prediction of Low Carbon Ferrochrome Smelt Based on the Working Condition
Authors: Zhang Niao Na , Liu Ke Wei , Zhang Bao Dong
Published: October 2011

Construct the model of the end-point ingredient prediction of low carbon ferrochrome smelt based on the working condition of electrothermal silicon method using the method of multi-scale support vector machiness information fusion, where the best decomposition scale information is according to different smelt working conditions using Levenberg-Marquart algorithm to optimize the design, smelt working condition is judged by Bayesian classifier. Researches have proved that this method can improve the precision of prediction and make the prediction result more accurate, reasonable and practical.
The Principal Component Analysis of Signal Characteristic Parameters
Authors: Li Guang Hui , Pei Zheng , Chen Ran , Hu Da Li
Published: October 2011

With the development of wireless communication, the automatic modulation recognition technology of communicational signals becomes an important theme. In this paper, based on multivariate statistical principal component analysis, we select characteristics of the signal, and use radio monitoring equipment mined measurement data to do some processing and analysis, which provided technical support to automatic modulation recognition of the radio signal.
Design and Implementation of a Simulation System for Armored Communication Countermeasure Training
Authors: Wang Zhen Nan , Gao Qiang , Wei Xin , Yin Shao Hui
Published: October 2011

Aiming at those problems faced by armored force which carried out real communication countermeasure training under complex electromagnetic environment, a simulation system was developed. Based on the analysis about threats faced by armored communication and the process of armored communication countermeasure, the system function and the federation member structure were designed, and the system was realized in the end by the distributed simulation technology of HLA. This system showed good performance of scalability and reusability, so it is suitable for the training of armored force.
Experimental Research of Solar Wall in Building Application
Authors: Qiu Lin , Zou Yue , Huang Li , Ren Geng
Published: October 2011

The paper investigated the efficient model of solar wall and the operation modes of solar wall system on buildings application, The construction of efficient solar wall was devised and experiment studied the operation effect. In order to find out the relationship between solar radiation and outlet air temperature, the air temperature change per unit solar radiation intensity (▽) was introduced. Study given: the system function or use of shade structures and architecture integration measures, relative to the building directly by the sun exposure, the surface temperature of building with the efficient solar wall can be achieved a more substantial cooling; the same time the system can be improved through natural convection air-conditioned room air quality will not result in excessive waste of energy. Solar radiation is the decisive factor in the process of heating air. to meet the requirement of indoor heating, the reasonable range of ▽ is 5.63-6.35, the optimum system wind velocity would be 3 m/s-7m/s.
The Research of Spectral-Line Monitoring of Transformer Vibration
Authors: Ding Qiao Lin , Chen Jian , Liu Li Qing
Published: October 2011

This paper presents the using vibration spectrum of transformer operational status with online monitoring methods, analyzes and discusses the transformer vibration spectrum about the producing mechanism and extraction scheme . At the same time, it also discusses the feasibility and necessity of using vibration spectrum methods to monitor the transformer fault .Some vibration spectrum methods ,relating to the transformer research contents and key technical breakthrough direction, are summarized in detail. Finally, it put forward a new immune from organization antibody network model and antibody generating algorithm that is used for vibration spectrum power transformer fault diagnosis.
The Research of Subsea Electronic Module for Subsea BOP
Authors: Cai Bao Ping , Liu Yong Hong , Liu Zeng Kai , Tian Xiao Jie
Published: October 2011

In the deepwater semi-submersible platform, the multiplexed electro-hydraulic (MUX) control system is typically used in the deepwater subsea blowout preventer (BOP) stack. In this paper the system architecture and the subsea electronic module (SEM) spatial layout for the MUX control system are presented, and the SEM housing is designed and the finite element model of the housing is built by using ANSYS software. The analysis results show the designed SEM housing can work well under 30MPa external hydrostatic pressure.
A Recognition Algorithm for M-QAM Based on Amplitude Distribution
Authors: Tan Lu Yuan , Wang Qian , Yan Xiao , Qin Kai Yu
Published: October 2011

An automatic recognition algorithm for M-QAM based on the amplitude distribution is proposed. This algorithm uses the normalized amplitude distribution to achieve automatic recognition for M-QAM signals, and enhances the correct recognition rate through the nonlinear amplification. Compared with the recognition algorithm based on amplitude moment, this algorithm does not need those prior conditions, such as carrier frequency offset, code element rate, amplitude factor and so on. The simulation confirmed that, when SNR≥16dB the correct recognition rate of this algorithm is greater than 90%.
Study on Driving Characteristics of Discrete Rod by Different Initiation Styles
Authors: Wei Ji Feng , Li Yuan , Wang Shu Shan
Published: October 2011

Initiation style can affect detonation wave, with which the movement and shape of rod is controlled deeply. The driving characteristic of discrete rod is investigated numerically by finite element code. Four initiation styles are chosen to analyze the driving rule of the shape and velocity of discrete rod. According to those investigating results, side one-point initiation is the optimal style. In this condition, higher velocity and lower velocity margin are obtained, as well. Compared with other initiation styles, side one-point initiation can improve the damage ability about 10% for the certain requirement.
Study on Four Parameters Estimation’s Methods of Time-Series Model in Modeling the Signal of a Quartz Flex Accelerometer
Authors: Zhong Xin , Zhao Chi Hang , He Jie
Published: October 2011

Box-Jenkins method of time series in modeling the signal of quartz flex accelerometer is studied in the paper. Firstly, a JSD-I/A quartz flex accelerometer is placed on a level test bench, and the output signal of the JSD-I/A quartz flex accelerometer is acquired. Secondly, the acquired signal of the JSD-I/A quartz flex accelerometer is preprocessed by Db3 wavelet denoising, trend items exacting, and standardized processing. Thirdly, The statistical characteristics of autocorrelation function (ACF) and partial autocorrelation function (PACF) of the processed time series data are analyzed, and the results show that ACF presents tailing characteristic and PACF presents censoring characteristic after 12th order. So AR(12) model is suitable for modeling the processed data of the JSD-I/A quartz flex accelerometer. Fourthly, the AR(12) model’s parameters are estimated by four methods, named least square method (LSM), Yule-Walker method, LUD method and Burg method, respectively. The fitting effects by residuals sum of squares (RSS) of the above estimation methods are compared and the results show that LSM outperforms the other three estimation methods.
ADAMS-Based Dynamic Simulation on Driving Axle Gear Meshing
Authors: Wang Ying
Published: October 2011

In the transmission system of drive axle, the gears' transmission performance of final drive and differential is the key to transmission system. Based on Automatic Dynamic Analysis of Mechanical System (ADAMS), the virtual gear meshing prototype of final drive and differential were established. Based on the Hertz elasticity impact theory, the contact forces between gears were built. The real-time dynamic simulation of gear meshing was achieved. The gears’ transmission of final drive and differential in drive axle was simulated under limit conditions by imposing different torque in driving gear of final drive and differential gears. The curves of meshing force and angular speed of differential gears and driving gears of final drive are obtained. The theoretical reference is provided to the study of the dynamic characteristics in gear transmission system.
Contact Analysis of Sealing Rings for Welding Bellows Mechanical Seal
Authors: Shavkat Asiye , Ahmat Mutellip , Ismayil Kaysar , Gheni Mamtimin
Published: October 2011

In this research, the FEM models of sealing rings for welding bellows mechanical seals were established by applying both isolation and integral contact method, and the displacement and stress of sealing ring’s were calculated. The result shows that a wedge-shaped was appeared on the seal face under the medium pressure and spring force. It can be seen that the integral contact analysis effectively illustrated that the convergence and divergence of the wedge-shaped deformation will be occurred in the contact face. The researching results provide a theoretical basis for the furthermore analysis of the deformation and frictional wear and structure optimization of sealing rings for welding bellows mechanical seal.
An Energy-Balanced Clustering Routing Protocol for Wireless Sensor Networks
Authors: Xiao Ping Ping , Tian Yan Tao , Chen Wen Ling
Published: October 2011

Wireless Sensor Networks have many limited capacities such as battery power, computation and communication bandwidth, how to balance the energy dissipation and prolong the network lifetime is a key problem. Based on the extensive analysis of LEACH algorithm, EBCP algorithm is proposed. It considers the nodes’ energy when clustering, and takes the nodes’ energy as a factor of the cluster head election: Increasing the probability to be cluster head of the higher-level energy nodes, and decreasing the probability to be cluster head of the lower-level energy nodes, so the nodes can adjust their probability to be cluster head as to their energy. Simulation results show that the modified algorithm can balance the energy distribution of the network and achieve better performance than LEACH in terms of the network lifetime.
Design and Application of a Measuring and Diagnosing System Based on Networked Virtual Instrument
Authors: Chen Guo Shun , Niu Gang , Ma Sa Sa
Published: October 2011

With the rapid development of virtual instrument technology and network technology, the networked virtual instruments appear great potential in remote measuring and diagnosing field. This paper first presents a measuring and diagnosing system for complicated electric equipments based on PXI/VXI networked virtual instruments, then analyze the architecture of the network and the hardware, software configurations. Currently, the system has been successfully implemented in a large, complicated electric equipment for measuring and diagnosing, and achieved good results.
Inter-Pulse Spectroscopy Based on Room-Temperature Pulsed Quantum-Cascade Laser for N2O Detection
Authors: Wang Min , Chen Jie , Liu Niu , Wang Ya
Published: October 2011

Mid-infrared lasers are very suitable for high-sensitive trace-gases detection for their wavelengths cover the fundamental absorption lines of most gases. Quantum-cascade (QC) lasers have been demonstrated to be ideal light sources with its special power, tuning and capability of operating in room-temperature. All these merits make it appropriate for the high resolution spectrum analysis. The absorption spectrum monitoring technology based on the QC laser pulsed operating in the room temperature, combining with the strong absorption of the gas molecule in the basic frequency, has become an effective way to monitor the trace gas with the characteristic of high sensitivity, good selectivity and fast response. In this paper, the inter-pulse spectroscopy based on a room-temperature distributed-feedback pulsed QC laser was introduced. Our approach to trace gas monitoring with QC lasers relies on short current pulses which are designed to produce even shorter light pulses. Each pulse corresponds to a single point in a spectrum. The N2O absorption spectrum centered at 2178.2cm-1was also obtained.
Measurement and Analysis of the Circuit Delay of CEI System
Authors: Tang Ge Shi , Li Li , Zeng Liang , Chen Lue , Zhou Lv
Published: October 2011

By using a four port Vector Network Analyzer (VNA), a caesium clock, a time-interval counter and a signal source to measure the delay of CEI system segmentally. Design measuring methods respectively for three segments of the circuit. When measure the delay, it is found that, delay of antenna’s amplifier output port to the input port of down converter (DC) is stable; the fluctuation of DC’s delay is less than 2ns; the cable delay’s standard deviation is stable at 0.1ns; we get a nanosecond accuracy for whole system. The methods of time delay measurement and the design of CEI system will provide a foundation and primary data for future deep space missions.
Multi-Node Spectrum Sensing Based on a Novel Dempster-Shafer Theory
Authors: Yin Zhen Dong , He Shan
Published: October 2011

In this paper, a novel and efficient Dempster-Shafer (D-S) evidence theory multi-node spectrum sensing based on double threshold judgment is proposed. A specific coordinate operation of D-S theory and double threshold judgment is discussed. It defines the uncertain area in double threshold detection, controls the application range of D-S theory and obtains the final detection results by drawing a clear line between data decision and information fusion. A better performance and higher sensing efficiency in a low signal-to-noise ratio is resulted according to the simulations.
Online Temperature Detecting System in Hot Machining Process
Authors: Zhao Li Min , Hou Zhen , Jia Dan Ping , Wei Quan Kang
Published: October 2011

A kind of optical fiber radiation pyrometer based on the theory of color comparison temperature measurement is designed in order to get the precise temperature on the appearance of work pieces during the process of plasma hot machining. In this article, the advantage of temperature measurement by optical fiber, the building of mathematic module for colorimetric temperature measurement, the application of key technology during the process of system building and the methods of reducing the interference is described in detail. The data calibrated and tested in blackbody furnace is given out. The results show that the precision of temperature measurement could reach to 0.5%. It is repetitiveness is well enough.
Portable Fault Testing Device of Electronic Instrument Based on PC 104 Bus
Authors: Feng Ke , Lu Ben Sheng , Li Huan Liang , Han Jun
Published: October 2011

A fault testing device for the electronic instrument of certain type military equipment is developed in this paper. The PC104 bus, modular instrumentation and signal processing technology are integrated in the device. It consists of PC104 bus peripheral system, signal condition circuit, electric distribution cabinet, interface unit, connection cables and peripheral dedicated signal fixture. Based on Windows CE embedded operation system, the application program is implemented with Visual C++ programming language. The device could detect and locate the fault on replaceable unit of modular board and functional block, and could also assist serviceman and technical support personnel in performing quick fault testing and equipment maintenance.
Research on FBG Spectral Optimization with Particle Swarm Optimization Algorithm
Authors: Wu Zhao Xia , Qiao Qian , Wu Fei , Cai Lu Lu
Published: October 2011

Characteristic information of FBG reflection spectra changes because of the existence of demodulation system error in the actual demodulation. The analysis of spectra for FBG under axial uniform force based on particle swarm optimization is given in this paper. Objective function is established and force experiments and numerical simulation of fiber Bragg grating have been made. The characteristic information of FBG reflection spectra under axial uniform force is extracted and theoretically reconstructed. The results show that, the improved particle swarm algorithm in fiber grating reflection spectra analysis is feasible. Also, the method has other characteristics such as high accuracy, good stability and fast convergence speed.
An Improved Method of Mathematical Model on Current Controlled Magnetic Levitation Ball System
Authors: Du Xiao , Zhang Yi Bo
Published: October 2011

This article presented a method to amend the model of magnetic levitation system by adding a current fixed link. It improved the accuracy of math model of magnetic levitation system with current controlled. Finally, simulation and experimental results showed effectiveness of the new model.
The Route Algorithm of Post-Disaster Road Monitoring System
Authors: Sun Xu Guang , He Jing Sha , Sun Xiao Ling , Yang Qiu Ge
Published: October 2011

The post-disaster road monitoring system provides an interesting application area for wireless sensor networks. After the earthquake, roads are subject to be blocked by landslides. The people require a scalable and low-cost technology for getting real-time dynamic data about road available because aftershocks occur continuously. Wireless sensor networks are a promising candidate to fulfill these requirements. Then the post-disaster road monitoring system solution is put forward. In this system, the ordered arrangement of node number greatly reduces the complexity of node location and provides the premise and guarantee for designing efficient route algorithm for the system. The algorithms of route established and route forwarding are designed for the arrangement and transmission characteristics of nodes, then are more efficient than general-purpose route protocol.
A Control Method of Hypersonic Vehicle Based on the Structured Singular Value Theory
Authors: Li Gang , Xu Lin Wei , He Hao , An Xing
Published: October 2011

Firstly, the conception of hypersonic flight and its flight characteristics are introduced in the article. Secondly, a control method based on the structured singular value theory is proposed, and the necessity of this method whether can be applied to design the hypersonic vehicle controller is discussed. And then taking a model for example, the robust controller of hypersonic vehicle is designed. At last, the control effect of this controller is proved better through the simulation result. It also turned out that the controller has excellent command track performance.
A Control System of Binocular Eyes Based on DSP TMS320F2812
Authors: Xie Shao Rong , Miao Jin Song , Li Heng Yu , Zhou Yu Mei , Luo Jun
Published: October 2011

This paper mainly introduces a binocular eyes system which is similar to the human eyes. The whole control system is based on neural network control model of human eyes, while the structure adopts spherical parallel mechanism to mimic the human eye movement. The whole Binocular control system consists of DSP embedded control system and PC platforms, which achieves the movement of the vestibular ocular reflex, convergence and conjugate movement, thus realizing good tracking of moving targets. This control system has compacted configuration and high reliability. A large number of experiments were done to validate the whole excellent system performance.
A Fluid-Driven Path Controllable Drilling Device with 3-DOF Hydraulic Steering System
Authors: Zhou Fang Yuan , Deng Min Sheng , Jin Meng Ren , Li Qin , Fu Xin
Published: October 2011

Drilling along a specified route is required in more and more applications. This paper introduces a path controllable drilling device based on fluid power, which requires no electric power and thus especially suitable for mine rescue. The mechanism design, control method and working mode of the most important part of the device, a 3-DOF hydraulic steering system, are illustrated. An analytical model is also provided to estimate the invisible posture and orientation of the steering system and thus the drilling path of the device as working underground.
Application of Fuzzy PID for the Ventilation and Air Conditioning System of Subway Station
Authors: Wang Jia , Wang Feng , Jiang Yong , Chen Zhi Xin , Yan Shi Tian
Published: October 2011

The ventilation and air conditioning system in the public area of subway station is a complex system which possesses a problem by once setting parameters of PID is difficult to ensure excellent control effect. Therefore this paper proposed an algorithm to adopt parameter tuning that could adjust the PID parameters on real time to ensure good quality of control system. It combined fuzzy logic control with conventional PID control algorithm, with the help of fuzzy tuning of PID parameters on line to change the control effect. By simulation, fuzzy PID controller could get better in control effect, higher in control accuracy, stronger in robustness than before.
Electric Vehicle Forecasting for China from 2011 to 2050 Based on Scenario Analysis
Authors: Fu Shi Jun , Ren Yu Long
Published: October 2011

With climate change being growing concerns, the development of EV (Electric Vehicles) has taken on an accelerated pace. This paper is to forecast China’s EV stock from 2011 to 2050 based on the double species growth model. We elaborate two orbits according to two scenarios: with vehicle stock being 200 and 300 per thousand people at 2050. These orbits reveals that, China’s EVs development has a golden stage which will last 10 to 11 years; And before this booming stage, there is a slowly growth period which will last 7 to 8 years. Furthermore, under each scenario, the difference between EVs and ICEVs (Internal Combustion Engine Vehicles) stock at 2030 is 4.69% to 6.77%, which confirms that China’s ambitious EVs program may be realized if government sets strong policy supports on this new industry persistently.
FPGA-Based Design of Resource-Efficient Digital down Converter
Authors: Cui Shu Lin , Li Xu
Published: October 2011

Digital down converter (DDC) is based on the theory of Software Defined Radio (SDR) and multirate signal processing, extensively applied in digital receivers of communications systems. An improved resource-efficient DDC with polyphase architecture and distributed arithmetic (DA) is presented in this paper. The design based on Xilinx FPGA Virtex-5 has more flexible characters and higher precision computation with less resource consumption.
Fuzzy Immune PID Control for 6-DOF Parallel Platform
Authors: Zhu De Quan , Xie Wen Hua , Sun Lei
Published: October 2011

To improve the control precision of six degree-of-freedom parallel platform, a fuzzy immune PID control method was presented based on the immune feedback mechanism and fuzzy control theory, and the parameters of PID controller was optimized with hybrid algorithm. First, least square algorithm was used for off-line optimization to form immune feedback control system. Then, genetic algorithm was used for on-line optimization to get the optimal performance parameters of immune PID control system and the optimal fuzzy proportional parameters. Simulation results demonstrated that the control method designed gets tracking effect with high precision and speed.
Nonlinear Behaviors of Giant Magnetostrictive High Power Ultrasonic Transducer
Authors: Zeng Hai Quan , Zeng Geng Xin
Published: October 2011

GMHPUT has a wide range of potential application in industrial. However, nonlinearity between exciting current and output displacement spoils GMHPUT’s performance. To explore the nonlinearity behaviors of GMHPUT, a nonlinear dynamic model was established. The bifurcation diagrams, phase portrait, Poincaré mapping diagrams, amplitude spectrum, Lyapunov exponent, etc. which demonstrate dynamical characteristics of the system were obtained by numerical integration. Analysis indicates: Nonlinearity of response could be improved by increasing of damping coefficient. Chaos would appear when stiffness of the system is low. At last experiments were done to verify the model. Calculation results and experimental results show a good agreement.
Controllability of Discrete-Time Multi-Agent Systems with Leaders via Switching Topology
Authors: Liu Bo , Hu Wei Na , Zhang Jie
Published: October 2011

This paper investigates the controllability of discrete-time multi-agent systems with leaders via switching topology. The results show that a multi-agent system can be switching controllable even if each of its subsystem is not controllable, by appropriately selecting some agents as the leaders and suitably designing the neighbor-interaction rules via a switching topology. Meanwhile, the controllability of systems can be only determined by the information from the leaders to the followers. Example and simulations are given to illustrate the theoretical results.
Petroleum Instrument Fault Analysis Based on the Data Mining Fault Dictionary Method
Authors: Jia Hui Qin
Published: October 2011

Oil plays an important role in national economy, and petroleum instrument is used to detect or acquire oil. But because now the functions of instrument are too complex, only which have work experience in this area more years can use it skillfully. Once the instrument is fault in work state, often using phone, but usually, the fault is difficult to describe, and so the work efficiency is influenced. A fault dictionary method is used to solve the problems about oil petroleum instrument and the knowledge organization and representation methods and relevant reasoning for fault diagnosis is presented in this paper. And the fault classification method uses Data Mining-method, which can easily classify the fault. And the above design method is realized using virtual instrument technology under the LabVIEW platform, and all the fault information is stored in the database, which uses the SQL server 2005 platform. Now this system uses in the field, when the instrument maintenance engineer input the fault keywords, then the information about the petroleum instrument such as fault phenomenon, solving method and fault place is disappeared in the list table. These systems uses very convenient, which are an auxiliary method to instrument maintenance engineer, and help them quickly locate the fault place.
Research for CAN Node Fault Rapid Detection Based on OSEK Network Management
Authors: Zhao Hai Xu , Wei Da , Qu Liang Dong , Chen Dong , Hao Bo
Published: October 2011

In order to detect the fault of automotive Electronic Control Units. In this paper, we proposed and implemented Controller Area Network (CAN) node management mechanism in the light of CAN technology standards and OSEK / VDX specifications. Besides, the standard protocols for analyzing low-speed CAN network application messages and monitoring network management messages had been developed. We utilized the vehicle network remote fault diagnosis platform and CAN analysis tool ZLGCANTEST to test the CAN data and analyze its real-time monitoring state. The experiment results indicate that CAN node management is capable of rapidly completing node fault detecting and promptly report node fault information for vehicle network remote fault diagnosis.
Research of Dynamic Compensation for Hysteresis Nonlinear
Authors: Wang Xiang Jiang , Tang Ji Song
Published: October 2011

The hysteresis nonlinearity reduces the accuracy of precision instrument..In order to mitigate the effect of the hysteresis, it is necessary to build hysteresis model and compensate hysteresis nonlinearity.The Krasnosel’skii–Pokrovkii （KP） operator is used to build hysteresis model, which the model is divided into linear part and nonlinear part. The KP compensating operator is proposed to compensate nonlinear part of hysteresis model. The Sliding model adaptive control law for the control method is deduced from the Lyapunov stability theorem. The emulational results confirmed the availability of hysteresis nonlinear compensation control.
Eutectic Growth Mode of Al-Si Alloy Solidified under High Pressure
Authors: Li Li Xin , Li Ming , Wang Hui Xin , Yang Zhong Juan
Published: October 2011

The Al-Si eutectic alloy solidified under normal pressure was prepared by vacuum Ar-arc furnace. The alloy solidified under high pressure was prepared by hexahedral anvil equipment. The two heavily etched samples were observed by scanning electron microscope. The experiments show that the eutectic silicon phase solidified under high pressure presents curved and near parallel lamellar crystal, and there is definite spacing between the layers, which was very different from that of solidified under normal pressure. So the eutectic growth mode of Al-Si alloy solidified under high pressure was put forward, which indicate that the growth mode of Si have been changed gradually from facet to non-facet under high pressure.
Fire Fighting of Wind Extinguisher with CO2 Gas Assisted
Authors: Liu Chang Sheng
Published: October 2011

The fire fighting equipments used for fight forest and grassland fire of China are mainly small two-stroke gasoline-powered portable wind fire-extinguishers owing to these areas are located in the more remote and inaccessible, where generally stay away from water. The main drawback of the wind fire-extinguisher is that it would lower the efficiency of power attributed to overheating of the two-stroke gasoline engine in the long process of firefighting, which will lead to decline the output speed and volumetric flow of fire extinguishing wind drived by the turbine when fire ambient temperature is high in the spring and summer. If this situation occurs, it will reduce efficiency of its fire fighting, what is more the adverse effects of wind to help the fire rather than put out the fire because the output of the extinguishing wind speed and volumetric flow is too small. In order to avoid the occurrence of such adverse effects and improve the extinguishing effect of fire extinguishers in the long process of firefighting, a program which use CO2 coordinate with wind fire-extinguisher to put out a fire was proposed in this paper, and the structure, characteristics of operation and precautions of the CO2 fire-extinguisher were described detailly.
The Study of Signal Characteristics of Critical Sensors on a Coal-Bed Gas Engine
Authors: Luo Jun , Teng Qin , An Peng
Published: October 2011

In order to solve the signal processing problems appeared in conventional engine control systems, the Discrete Fourier Transform (DFT) was used for frequency domain analysis, on this basis, it’s possible to make suggestions as to the selection of real-time sampling frequency and sensor signal averaging strategies as well as analog/digital anti-aliasing filter parameters in engine control system. To describe pumping fluctuations existing in model-based engine control system for a coal-bed engine, the pumping fluctuation models of air and fuel gas mass flow rate in intake manifold during steady-state operations were established based on the result of signal frequency domain analysis, thus it’s possible to optimize the conventional Mean Value Engine Model.
A Novel Method of PAPR Reducing for OFDM Systems
Authors: Sun Shan Lin
Published: October 2011

In order to reduce the PAPR of OFDM system, DST is introduced into OFDM systems. DST will not cause BER deterioration and side redundant in OFDM system. In this paper, the performance of DST-OFDM systems is analyzed in theory. The simulation results show that DST method is better than conventional manners in PAPR reducing, system BER performance and implementation complexity.
One-Step Synthesis of Fe3S4 Micro-Crystals and its Facile Transformation to Fe7S8 Micro-Crystals
Authors: Yuan Bin Xia , Fu Hong Hong , Luan Wei Ling
Published: October 2011

A flask solvothermal method was firstly utilized to facile synthesize greigite Fe3S4micro-crystals (MCs). By using iron nitrate, element sulfur as raw materials as well as oleylamine as the solvent, high yield of Fe3S4MCs with hexahedron microstructure was obtained. In addition, it was found that it was easily to achieve transformation between Fe3S4and Fe7S8through changing reaction temperatures and iron-sulfur ratios. The several different morphologies of Fe3S4MCs were obtained by using other sulfur sources. The synthetic approach demonstrated here could be of great potential for the controlled synthesis of other metal chalcogenides.