bluuebunny/crossref_metadata_2025 huggingface dataset:
Application Research of Virtual Prototype Technology in the Variable Stiffness Suspension Matching of Light Bus
Authors: Fang De Guang , Wei Guo Xin , Shi Wen Ku , Wang Chang Xin
Published: April 2014

In order to meet the ride comfort requirements of the light bus under no load and full-load condition,its rear suspension employs two-level variable stiffness leaf spring. For reasonably matching the two values of the variable stiffness and the damping force curve of the damper, one kind of virtual prototype technology was used. The virtual spring model of two-level variable stiffness was created in Adams-Chassis and the center-curve of the leaves was based at the free-state of the leaf spring. Then the front suspension, the rear suspension, the steering system, the powertrain & drineline system, the braking system, the wheels and bus body were respectively builded in Adams_Car, and they consituted the virtual assembly model of the light bus. So we could use the virtual model to conveniently test the performance of the ride comfort and handling stability under the no load and full-load state. Based on the ISO test standards, the virtual objective evaluation indexes were all calculated. According to these indexes, the two-level variable stiffness and the damping force curve were optimized. At last, the optimization results were verified by testing the optimized light bus. Experimental results shows that virtual optimization technology could play an important role in solving engineering problems.
A Multi-Objective Programming Model of Dynamic Adjusting Flight Traffic
Authors: Zhang Zhao Ning , Hao Zhong Zhou , Gao Zheng
Published: April 2014

To alleviate the conflicts between the current flight traffic demand and the resource constraints of airspace, we need to improve the restrictions of flow allocation caused by the static air traffic flow allocation mode. The author analyzes the optimal allocation problem of dynamic adjusting flight flow and draws the conclusion that the problem should satisfy multiple targets, such as low flight delays, low flight cost and balancing the load of the route. Then consider a variety of limiting factors, such as the capacity of the route, flight planning, emergency situations, etc. Then establish multi-objective programming model of dynamic adjusting flight traffic. The objective function is determined by the flight cost, the flight delays and the value of the load balance. And the value of the load balance was first proposed according to the idea of least squares method. Then solve the model based on linear weighted technique. Finally the numerical result shows that the model can satisfy the multiple objectives and dynamic adjust the flight traffic optimally, that proves the rationality and validity of the model and the algorithm.
Piezoelectric Properties Study of KNN-LS Lead-Free Ceramics Synthesized by Sol-Gel Method
Authors: Jin Xin , Fu Xing Hua , Tao Wen Hong , Hou Yang Lu
Published: April 2014

Morphotropic phase boundary (MPB) composition, KNaNbO3-0.052LiSbO3(KNN-LS) was synthesized by sol-gel method at this experiment. Sb2O3 was used as economic Sb source and the final dried gel was calcined at 650°C for 2h to obtain white nanopowder. The sintering experiment was carried out at the temperature range of 980°C-1130°C, and perovskite phase structure could be observed apparently below 1080°C. When the temperature reached 1080°C and above, the second phase Na3LiNb6O17 appeared meanwhile the piezoelectric coefficient (d33) decreased quickly. Its proven that fine-grained particles and low sintering temperature could be obtained in sol-gel route.
On-Orbit Servicing Task Allocation for Multi-Spacecrafts Using HDPSO
Authors: Zhang Ying , Zhang Qiang
Published: April 2014

By analyzing the key indicators which contain the value of the target spacecrafts, the attrition of servicing spacecrafts and consumption of time and fuel, a mathematical model is formulated. And a hybrid discrete particle swarm optimization (HDPSO) algorithm is proposed. Simulation results show that the algorithm can efficiently solve the multi-spacecrafts task allocation problem under multiple constraints.
Research on Path Planning of Manipulator for Aerial Boom Refueling Test System
Authors: Yuan Dong Li , Zhao Chuang Xin , Xiao Zi Bing
Published: April 2014

According to the characteristic of aerial boom refueling test system which is composed of tanker, drag system, manipulator, refueling boom, the movement of refueling boom is controlled by manipulator in this paper. In order to make the path from one point to another point of the end manipulator become the shortest, this paper gives the caculating methods of the shortest path for the end manipulator and path for the joint B of the manipulator. To realize the movement of the manipulator follow the planned trajectory, the motion strategy of three-step movement is proposed. Simulation results show that the motion strategy is effective.
Research on the Influence Factors for Bus Based on Nonlinear Model
Authors: Yan Yu Guang , Xu Hong Guo , Liu Hong Fei , Ma Bin
Published: April 2014

Improved 5-DOF vehicle which contains nonlinear steering and tire models was established to solve the deficiency of conventional dynamic linear models to analyze coupling characteristics. Based on GPS technology, a developed vehicle handing and steering stability detecting system comprised by Steering Force and Angle Tester, GPS, Gyroscope and high precision Data Collector was introduced. According to Matlab/Simulink platform and vehicle test, the dynamic model was verified. Then some influence factors on bus handing and steering stability such as structure parameters, suspension parameters and tire parameters were analyzed. The results show that the longitudinal position of gravity and the vertical distance of gravity and roll axis have a good effect on vehicle yaw and roll responses. Spring roll stiffness is important parameter for vehicle roll. The pneumatic trail is closely related on steering reversibility and comfort. These researches have direct reference value for bus design.
In-Cylinder Heat Transfer Model for Diesel Engine Based on Improved Woschni Correlation
Authors: Liu Xiao Ri , Li Guo Xiang , Hu Yu Ping , Bai Shu Zhan , Deng Kang Yao
Published: April 2014

Based on the Woschni correlation, a three dimensional in-cylinder heat transfer model is proposed, which develops Woschni correlation from zero dimension to three dimension. Characteristic parameters are proposed as transient flow and heat transfer parameters from in-cylinder CFD simulation, with further consideration of the influence of thermal conductivity, viscosity and Prandtl number. According to test data, the new correlation can be regressed. The new model costs little more calculation time, and it can satisfy the engineering demand.
Research on Linear Motor in Deep Exploration Based on Experiment
Authors: Yan Zhian , Wang Kang , You Song Chao , Xiao Jing Ping , Cheng Shao Hua
Published: April 2014

Linear motor is applied in the seismic source system of deep well seismic wave exploration, which belongs to international cutting-edge techniques of the exploration industry. Compared to traditional blasting techniques, the technique has better safety performance and lower cost. It is concluded that the setting basic frequency is a critical factor for start-up force of the linear motor in the seismic source system based on the experiment and relative data. The concept of practical efficiency is proposed. In addition, the performance of the linear motor was improved significantly by analyzing relative data curves between inverter output frequencies, line voltage of the linear motor and the start-up force of the linear motor.
Design of a Compact UWB Antenna Using Two Modified U-Shaped Slots for Satellite Frequency Rejection in C-Band and X-Band
Authors: Li Li , Zhao Zhang Zhuo , Yin Xiao Li
Published: April 2014

A novel printed microstrip-fed monopole antenna with a dual band notched characteristic has been designed and analyzed. The antenna has a rather compact structure with total size of 18×12×1.6mm3. Band notched has been created by inserting slot on the radiating patch and on the microstrip. Wide impendence bandwidth is produced by modify the ground plane. Good radiation performance is achieved in the frequency band of 3 to over 13 GHz with dual band notched of 3.7-4.2 and 7.0-8.0 GHz.
Satellite Module Layout Design Based on Adaptive Bee Evolutionary Genetic Algorithm
Authors: Su Jian Jiang , Che Chao , Zhang Qiang , Wei Xiao Peng
Published: April 2014

The main problems for Genetic Algorithm (GA) to deal with the complex layout design of satellite module lie in easily trapping into local optimality and large amount of consuming time. To solve these problems, the Bee Evolutionary Genetic Algorithm (BEGA) and the adaptive genetic algorithm (AGA) are introduced. The crossover operation of BEGA algorithm effectively reinforces the information exploitation of the genetic algorithm, and introducing random individuals in BEGA enhance the exploration capability and avoid the premature convergence of BEGA. These two features enable to accelerate the evolution of the algorithm and maintain excellent solutions. At the same time, AGA is adopted to improve the crossover and mutation probability, which enhances the escaping capability from local optimal solution. Finally, satellite module layout design based on Adaptive Bee Evolutionary Genetic Algorithm (ABEGA) is proposed. Numerical experiments of the satellite module layout optimization show that: ABEGA outperforms SGA and AGA in terms of the overall layout scheme, enveloping circle radius, the moment of inertia and success rate.
Research of Real-Time Fault Diagnosis Platform of Aero-Engine’s Fuel Flow Sensors
Authors: Sun Zhao Rong , Sun Yi Gang
Published: April 2014

The purpose of the research is to put up a fault diagnosis algorithm of the aero-engine’s fuel flow sensors and verify the platform through simulation based on the QAR (Quick Access Recorder) data. By analyzing the correlations of the parameters that affect the conditions of the engine, a three-layer BP network model is established. Then, in order to solve the influences to the BP model in the full envelope due to the fluctuations of transition between different flight phases, a region partition method is used to divide the whole flight envelop into several regions and corresponding BP model is established. Finally, the QAR data are used as the training samples to build the BP network for different regions, then, the real-time data are used as the inputs to verify the platform. The simulation results show that the region partition method can effectively detect the fault of the fuel flow sensors.
Research of Stitching Scraps Automatically Based on Cluster Analysis
Authors: Cao Cheng Sha
Published: April 2014

Artificial shredding splicing technology is high accuracy but low efficient. This paper applies the computer automatically stitching method and builds a new model to improve the efficiency. In the process of solving the model, firstly, do the cluster analysis according to a principle, whether there is handwriting at the top or the bottom of the fragments. Secondly, increase the feature information weight of the dense points to get the best image stitching of each row. Finally, match each line of the debris with the principle of maximum matching degree to get the optimal matching results.
Key Technologies for Health Management and Applications of Aero-Engine Based on Principal Component Analysis
Authors: Cui Jian Guo , Zhao Xu , Li Jun , Cui Bo , Jiang Li Ying , Shi Jian Qiang
Published: April 2014

Aero-Engine health management generally involves a series of activities over the period from the aerospace breaking down until it returning to normal, including signal processing, monitoring, health assessment, decision supporting, human-computer interaction, and so on. As one of the key technology of Aero-Engine health management, fault diagnosis plays a very important role on the safe operation of Aero-Engine. Currently, for effective challenging Aero-Engine health management, a fault diagnosis of Aero-Engine based on Principal Component Analysis (PCA) s proposed. Firstly, based on a variety of significant parameters of the collected information, principal component analysis model is established. Secondly, the fault diagnosis of engine operating conditions is realized by comparing the T2 statistic and Squared Prediction Error (SPE) statistic as an engine running in good condition threshold limits. Finally, through the variable's cumulative contributions diagram with the behavior of SPE overrun, the fault variables are effectively worked out. Experimental results show that the proposed PCA method can efficiently come true Aero-Engine health management o and has some engineering applications values.
Study on Generating Characteristics of Free-Piston Engine Generator
Authors: Wang Dao Jing , Jiang Yi Tong , Liu Fu Shui
Published: April 2014

In order to increasing the energy efficiency of Free-piston engine generator (FPEG), an experiment was taken on to study the generating characteristics for it is one of the most impressive factors. The results show that: The aptitude of phase voltage is related with velocity of piston and flux of linear generator, phase difference is 120 degree; the piston is not moving in uniform motion; the velocity around TDC and BTD has obviously different; with the work frequency increase, the output phase voltage is increasing; when the external resistor is equal to interal resistor, the output power reaches it maximum.
Performance Analysis of Direct-Driven Permanent Magnet Generator with Output Power of 3MW
Authors: Zhang Yue
Published: April 2014

This paper discusses the effect of pole-slot combination as well as phase number on performance of PM generator direct-driven by wind turbine, on these basis, based on the equivalent circuit model, 3MW and 78poles and 324slots permanent magnet generator direct-driven is designed. The characteristics of the permanent magnet generator direct-driven under condition of no load and rated load are analyzed by means of coupled field-circuit method. The simulation and experiment results show that the designed permanent magnet generator direct-driven is feasible in wind power generation.
Research on Experimental Methods of Evaluating Deterioration Performance of High-Voltage Insulators
Authors: Cheng Jiang Zhou , Wang Si Ying
Published: April 2014

High-voltage insulator is a kind of common and important device in the grid, in the processing of its function, effections of various environmental factors will make its insulation to deterioration and decline, without timely treatment, the accumulated deterioration may lead to surface discharge, and even surface flashover, which will damage the insulation and greatly endanger the safety of power system. A method by accurately testing the ultraviolet intensity of insulators which is under the conditions of different deterioration and filthy is proposed on this basis, and depend on which we can provide evidences for finding early deterioration of insulators.
The Study of LED Linear Dimming with Hysteresis Current Driver and Peak Current Detection Driver
Authors: Chen Gong Bei , Huang Ton Churo , Leu Yih Guang , Hung Kuo Teng
Published: April 2014

This paper studies the characteristics of LED linear dimming using Peak Current Control (PCC) and Hysteretic Current Control (HCC) methods. It presents the PCC and HCC circuit architectures,discusses their strength and weakness with various architectures and experimently compares their dimming range and current control capabilities .
Design of an Intelligent Help System
Authors: Lan Zhen Ping , Wang Yu Ru , Li Ping , Lin Yun Duo , Meng Hui Min , Wang Zhi Sen
Published: April 2014

By researching the usual lose problems of field exploration, this paper puts forward and designs an effective personnel help device for tour pal to send help signal to teammates or rescue people. This device comprises a power supply, a temperature and humidity sensor, a GPS positioning, electronic compass, a 433MHz communication module, an OLED display and a micro controller module. This system uses the STM32 series ARM microcontroller with C language programming. It greatly educes the danger coefficient of the field exploration, and the cost of search work of the human, material and financial resources in the field.
Study on Preparation and Properties of Vitrified Beads-Polystyrene Particles Insulation Mortar
Authors: Chen Yu Peng , Tao Wen Hong , Fu Xing Hua , Dong Li Yuan , Yu Hai Tao
Published: April 2014

Orthogonal testing method was used to study the effects of polystyrene particles, hydrophobic agent, air-entraining agent, polypropylene monofilament fiber on dry density, compressive strength, water absorption and softening coefficient of composite insulation mortar. The optimal ratio was obtained as: 3% of the weight are polystyrene particles, 0.2% is hydrophobic agent, air-entraining agent counts for 0.4wt%，and polypropylene monofilament fiber 0.6%. The main performances of the mortar were recorded as: dry density was 228Kg/m3, 28 day compressive strength after conserved for 28 days was 0.54MPa, and thermal conductivity 0.0596W/(m•K). Microstructure of the composite insulation mortar was analyzed by SEM (scanning electron microscopy) and its function mechanism was studied preliminarily.
Multiple LAMMPS Script of Graphene Crystal Cell
Authors: Hui Zhi Xin
Published: April 2014

It is the premise and foundation of numerical simulation to build models, because the optimal initial configuration of models can reduce the time of optimization and relaxation, and the ideal simulation results can be obtained. Nevertheless, as far as beginners are concerned, non interface operation of the LAMMPS system makes them more difficult to learn and manipulate, so they have no choice but to study the manual over and over again. Well, at least spend far too long in learning manual on account of less corresponding resources. Firstly, the basic concepts were presented in the paper such as lattice, unit cell, primitive cell, basis vector and lattice constant of crystal. Furthermore, what should be considered when compiling the LAMMPS script of lattice was described. Considering graphene, as material science and other areas of research focus at present, its lattice scripts were compiled respectively in the paper, including different chiralities of zigzag and armchair, different stacking ways of AA and AB. finally, the monolayer graphene models lattice structure of 2×2 and bilayer graphene models lattice structure of 2×2×2 were showed respectively using the VMD visual software, and this will provide beginners with a variety of ideas in modeling.
Effect of Material and Work Status of Vascular Stents on Flexibility Property of Stents
Authors: Shen Xiang , Zhou Xiao , Ge Tao
Published: April 2014

Flexibility is an important mechanical property of stent. The primary aim of this investigation is to evaluate the effect of material and work status of vascular stent on the flexibility of stent using finite element method (FEM). Uniform bending moment was applied to unit models of stents with the help of multipoint constraint element. The results show that the flexibility of biodegradable pure iron stent is better than one of stainless steel stent. Among three work statuses of stents, the flexibility of expanded stent is the worst, while the flexibility of crimped stent is the best. In conclusion, FEM can quantify stent mechanical behaviors related to flexibility and help surgeons to select favorable stents and help designers to pretest and improve flexibility of new stents.
Measurement of Cutting Speed of Mechanical Excavator
Authors: Hou Ya Juan , Wang Ji Sheng , Li Ai Feng , Gao Su He , Wang Guo Qiang
Published: April 2014

Only when mining at reasonable cutting speed, can a mechanical excavator achieve high efficient and low consumption. The same cutting-angle logarithmic spiral trajectory is initially confirmed for the model of a reasonable excavating trajectory to reduce digging resistance. An analytical expression between hoisting and pushing speed is derived from the mechanism kinematics theory and the constraint equation method. This expression accurately describes the cooperative relationship between these speeds. Virtual prototype kinematics of a large mechanical excavator are simulated and verified through ADAMS. The simulation result is consistent with the theoretical result, and thus validates the analytical expression between hoisting and pushing speed.
The Test System of Submersible Motors Performance Based on LabVIEW
Authors: Zhang Chun Qing
Published: April 2014

This paper introduces testing system of submersible motor that used for oil field based on virtual instruments. The system can detect, analyze, process and acquire data by national instruments’ graphical programming 1anguage，LabVIEW and DAQ board. It has a perfect man-machine interface. Because of its successful application in factory, work efficiency is improved greatly. IntroductionSubmersible motor is the power component of the submersible which performance affects the normal operation of the whole unit. With the development of production, varieties and yield of the machine are increasing and routine testing work is also increasing, but the test means has lagged behind. At present, the testing technology of submersible motor has been perfect in foreign, and able to provide the accurate performance curves to the user at the same time, At home, the dynamometer test of submersible motor is limited to some basic parameters measurement, and can not map the five characteristic curves of the motor accurately. Therefore, developing a set of rodless pump dynamometer system is necessary. The system is based on the NI company Labview software development platform and hardware platform, it can test automation and draw submersible motor performance curve accurately.
Research Status and Trend of On-Board Diagnostics
Authors: Yao Guang Tao , Wu Heng , Guo Zi Rong
Published: April 2014

On-Board Diagnostics System is an Effective means to control vehicle emissions. With the issuance of increasingly stringent emission standards, On-Board Diagnostics System is constantly developed. The On-Board Diagnostics System was analyzed from two perspectives such as research status and trend. The relative standards of On-Board Diagnostics were highlighted. OBD-III was specifically addressed. Finally, some suggestions about OBD of China were put forward based on the analysis of the research status and trend of OBD at home and abroad.
Design of Ultrasonic Ranging Alarm Device Based on SN8P2501B
Authors: Zhang Pan Feng , Ma Ling Kun , Li Hui Zhen
Published: April 2014

Introduced one ultrasonic ranging alarm device based on SN8P2501B microcomputer, it mainly included ultrasonic emission circuit, receiving circuit, keyboard, alarm circuit and the software. Compared with the traditional ranging methods, the system used 555 time-base circuit to produce ultrasonic, and designed a temperature compensation circuit to eliminate effect of sound velocity produced by the environment temperature. The practical application results show that the ranging system is stable , reliable and highly accurate, so the technology and methods adopted in the system are highly practical and worthy of being used abroad.
Application of Timesten on Web-Based Monitoring System
Authors: Bai Wen Ruo , Wang Ning Bo , Zhu Jun Chao , Zhang Bao Feng
Published: April 2014

In order to gain high response speed, the paper presents a hybrid Timesten and Oracle database structure. First, the paper creates concepts of real-time database and historical database. It also points out their relationships. Second, it builds a hardware structure which involves an application server, a Timesten database server and an Oracle database server. The structure adopts uninterruptible power supply for data reliability. Last, it presents a software structure of databases. The Timesten acts as the real-time database and the Oracle acts as the historical database. There is a layer in front of the Timesten for data acquiring and an agent layer between the Timesten and the Oracle for data transmission. Experiment shows that the Timesten is about 6.69 times faster than the Oracle disk database.
The Trajectory Planning and Simulation for Industrial Robot Based on Fifth-Order B-Splines
Authors: Gou Zhi Jian , Wang Cheng
Published: April 2014

The trajectory is planned with fifth-order uniform B-splines for the industrial robot aimed to assure the motion is smooth and the trajectory is fourth-order continuous. Under the premise to satisfy the initial kinematic parameters of the robot as zero, its speed, acceleration and jerk are continuous. Based on B-spline theory, process five B-spline curve function is calculated inversely in joint space. Under the robot kinematics parameter constraints, using fifth-order B-spline interpolates to plan robot trajectory when known interpolation points and the kinematic parameters are simulated and validated by the software of ADAMS.So it provides an effective new method for the trajectory planning.
Optical Flow-Based Monocular Vision/INS Integrated Navigation for Mobile Robot Indoors
Authors: Chen Xi Yuan , Gao Jing Peng , Xu Yuan , Li Qing Hua
Published: April 2014

This paper proposed a new algorithm for optical flow-based monocular vision (MV)/ inertial navigation system (INS) integrated navigation. In this mode, a downward-looking camera is used to get the image sequences, which is used to estimate the velocity of the mobile robot by using optical flow algorithm. INS is employed for the yaw variation. In order to evaluate the performance of the proposed method, a real indoor test has done. The result shows that the proposed method has good performance for velocity estimation. It can be applied to the autonomous navigation of mobile robots when the Global Positioning System (GPS) and code wheel is unavailable.
Iterative Learning Control for a Class of Modeling Undesirable Single Degree of Freedom System
Authors: Zhou Wei , Liu Bao Bin
Published: April 2014

A class of modeling undesirable single degree of freedom system is studied by using iterative learning control. The proposed iterative learning algorithm constantly updates the control input according to output error until the desired output occurred. So the system with designed controller can achieve perfect accuracy. We have proved convergence properties in iteration domain and simulation results demonstrate the effectiveness of the presented method.
Study on Key Technology of High and Low Temperature Test System for Flight Control Unit
Authors: Zhou Qiang , Hong Bin Bin
Published: April 2014

According to the engineering requirements of multiple sets of Flight control unit in high and low temperature test, a new test system based on CPCI bus with a signal switching and distribution unit is designed to increase test efficiency. This test system can switch serial test under programming control for multiple sets of flight control unit in a certain temperature gradient, saving the time of temperature change and staying warm, eliminating a lot of tedious manual operations. Theoretical analysis and engineering practice has proved that this test system significantly reduces the testing time in high and low temperature test up to thirty hours (five sets of DUT), namely that relative time efficiency is up to 75.4% (five sets of DUT). It also has some other advantages such as saving hardware resources and flexible use.
Approximate Controllability of Boundary Control Systems with Nonlinear Boundary Conditions
Authors: Wang Lian Wen
Published: April 2014

The paper deals with the approximate controllability of a class of nonlinear delayed control systems in which the control is acted through the boundary of the region and the boundary conditions are nonlinear. The approximate controllability result is established provided the approximate controllability of the corresponding linear systems.
Research on Multi-Speed Control of Variable-Frequency Drive
Authors: Song Xiao Na
Published: April 2014

This paper introduces a noval experimental teaching project. Different from previous experiment, in this project, three-phase motor can operate at multi-speed mode or continuously variable speed mode controlled by PLC and VFD. The obvious characteristic of the experiment is that the VFD is controlled by PLC automatically. The configuration of the experiment including hardware and software is introduced in detail. The results of the execuation of the PLC program reveals that three-phase motor can operate in two modes according to the instructions from PLC. In addition, the speed can be changed with the corresponding parameters seting. Therefore, the knowledge of PLC and VFD are combined in one teaching project, through which student can master more practical technique. The work of this paper is significant for improving the students’ comprehensive capability.
Rotor Orientation Control Strategy of a Linear Arc-Shaped Induction Motor with Multiple Stators
Authors: Di Jun , Fan Yu , Liu Si Jia
Published: April 2014

This paper proposes a rotor orientation control strategy on the large proportion of gyroscopic precession of a linear arc-shaped induction motor with multiple stators, applied to maglev bearings. A physical model of the rotor, considering gravitation, is established via analysis based on rotor dynamics: the kinematic model of the rotor, which is installed vertically, can be simplified as rigid body fixed-point rotation. To complete the dynamic formula, the equivalent circuit of a linear arc-shaped induction motor is transformed into dq0 model by Park transformation, in which the decoupling control of the tangential force and the normal force is determined. Moreover, to realize the control strategy combined air-gap cross feedback with damping method, parameter identification, including no-load test and locked rotor test, is modefied. Therefore, the control strategy, aiming at controlling the speed and guaranteeing the rotor rotating vertically around its axis simultaneously, by adjusting the current of the four stators, can be proved by simulation and experimental platform.
Self-Tuning Weighted Fusion Kalman Filter for ARMA Signals
Authors: Liu Wen Qiang , Tao Gui Li , Han Na
Published: April 2014

For the multisensor single channel autoregressive moving average (ARMA) signal with a white measurement noise and autoregressive (AR) colored measurement noises as common disturbance noises, when model parameters and noise statistics are partially unknown, a self-tuning weighted fusion Kalman filter is presented based on classical Kalman filter method. The local estimates are obtained by applying the recursive instrumental variable (RIV) and correlation method. Then the optimal weighted fusion Kalman filter is obtained by substituting all the fusion estimates into the corresponding optimal Kalman filter. A simulation example shows its effectiveness.
Brush Plating Surface Strengthen of the Cr12MoV Stamping Die
Authors: Li Guang Su , Ding Jie
Published: April 2014

Cr12MoV are grandly utilized in the stamping die for stainless steel processing, the sticking friction will exist between the die and the stainless steel plate, which will seriously influence the quality of the product and the life of the die. In this paper, brush plating was utilized to plant a Ni-P layer on the surface of the die. The results show that the Ni-P layer could effectively stick to the surface of the Cr12MoV stamping die and also have good rigidity and abrasion-resistance after a heat treatment in 400°C.
Image Measurement of Traffic Flow Parameters and its Traffic Congestion Evaluation
Authors: Jia Dong Yao , Hu Po
Published: April 2014

Current evaluation methods on urban traffic congestion are mostly based on traffic flow information. However, the measurement of traffic flow remains to be controversial and difficult for the community. This paper points out an algorithm to acquire traffic parameters and studies the evaluation methods based on it. By extracting multi-color-feature information from image and vehicle shape match algorithm based on fuzzy rules, this method can efficiently distinguish vehicles from each other thus to calculate the traffic state parameters according to the results of this method. Then it can build congestion evaluation model with vehicle delay rate as the critical parameter. The experiment indicates that this method can acquire the accurate real-time road parameters and also proves it is valid to apply this method in urban traffic congestion evaluation in different situations.
Optimization of Control Parameters Based on Multi-Objective Genetic Algorithms for Spacecraft Large Angle Attitude
Authors: Huang Qiang , Zhang Jian Xin , Zhang Qiang , Wei Xiao Peng
Published: April 2014

Based on multi-objective generic algorithms, a novel approach to optimizing control parameters for large angle spacecraft attitude was proposed. The large angle attitude maneuver controller was designed by taking the spacecraft nonlinear dynamics model and Lyapunov method. To optimize the controller parameters, the alterable weight coefficient method was adopted. Optimal value of time and power consumption acted as fitness goals of the algorithm. Simulation results showed that the algorithm proposed in this paper was superior to the traditional single-objective optimization design method.
Human Motion Capture Data Segmentation Based on LLE Algorithm
Authors: Zhang Shu Lu , Zhou Dong Sheng , Zhang Qiang
Published: April 2014

In this paper, we propose the motion sequence segmentation based on LLE (Locally Linear Embedding) algorithm. The method is to reduce the dimension of the high dimension motion sequence to obtain one-dimension feature curve. Then we use the feature curve to achieve motion sequence segmentation. Simulation results demonstrate that this method can achieve motion sequences segmentation and improve the accuracy rate greatly compared with the traditional algorithm.
Study of Intelligent Evidence Management System
Authors: Liu Feng , Wu Xing , Pan Nan , Zhou Jun , Liu Yi
Published: April 2014

Based on the LabVIEW platform and SQL server database, the intelligent management system of physical evidence is developed, which implements the intellectualization and networking and makes the staff in the public security organization manage the evidence more conveniently, safely and efficiently. The key techniques including the design of evidence room, the hardware design and form controls of browsing information were introduced in detail. Finally, reliability, availability and stability of the system were proved through testing by the public security department for a period of time.
The Silicon Plates in Buried Oxide for Enhancement of the Breakdown Voltage in SOI MESFET
Authors: Estakhrian Haghighi Amir Reza , Mohamadi Mojtaba
Published: April 2014

This paper introduces a novel SOI MESFET which enhancement breakdown voltage (VBR) by modifying electric field distribution. To achieve high enhancement of the VBR utilized three Silicon plates in buried oxide of the silicon on insulator metal semiconductor field effect transistor (SOI MESFET). This change in the SOI MESFET structure leads to controlled electric field distribution , increase VBR and Output Resistance (RO). The numerical simulation results show that the VBR of the Silicon Plates SOI MESFET (SP-SOI MESFET) structure improves by 50% compared with that of the conventional SOI MESFET (C-SOI MESFET) structure. As a result, the SP-SOI MESFET structure has superior electrical performances in comparison with the conventional structure.
Parametric Design and Modal Analysis on Oval Gear Based on CATIA
Authors: Huang Zhi Dong , Du Yun Pu , Li Han Xiao , Sun Xiu Li , Wang Yu
Published: April 2014

The characteristics of oval gear is analyzed. The parameters of oval gear are chosen and calculated. The three-dimensional solid modeling of oval gear is achieved. The dynamic model of oval gear is established by FEM and modal analysis of oval gear is investigated. The natural frequency and major modes of the first six orders are clarified. The method and the result facilitate the dynamic design and dynamic response analysis of oval gear.
A 3D Computation of Fluid-Structure Interaction in a Cyclone Separator
Authors: Zhang Pan , Wang Bei , Guo Zhi Peng , Shen Ya Nan
Published: April 2014

This work presents a 3D computation of fluid-structure interaction in a cyclone separator. The finite volume method was used to simulate the flow field in the cyclone separator. The fluid-structure interaction was conducted by transferring the computational pressure distribution to the corresponding surface of the cyclone shell. The stress and deformation distribution in the cyclone shell was computed by the finite element method. Results obtained show that the maximum equivalent stress and deformation is linearly increases with the increases of the inlet gas velocity.
Thermal Spreading Performance of Copper-Graphite Film Attached on BLM-Reflector
Authors: Lee Chi Chiang , Hsu Hong Te , Huang Ming Chih , Huang Hong Hsin
Published: April 2014

In LEDs Backlight Module, reflector who made by metal and contacts to LEDs possesses higher thermal conductivity. The reflector was expected to dissipate the heat from the LEDs, however, it is not good enough to decrease the LEDs temperature rise. In this study, a copper-graphite film with thickness of 82.5 μm was attached to the back of reflector to increase the heat dissipation. The temperatures along the x, y, and z direction were measured to evaluate the thermal spread performance. Results showed that a 19% temperature rise decrease was found for LEDs and a half temperature increase was also measured along the LEDs bar direction. In addition to that a higher thermal conductivity could spread the heat to the remote end resulting in temperature increasing to enhance the heat dissipation by way of reflector.
Aerodynamic Analysis and Design Numerical Simulation of the Vortex Flow over a Common Research Model with Flying-Wing Configuration
Authors: Li Yong Hong , Huang Yong , Su Ji Chuan
Published: April 2014

Previous wind tunnel study has found that the lift slope of a common research model with flying-wing configuration in a transonic freestream can experience a sudden drop as the angle of attack is increased. A numerical investigation of aerodynamic characteristics of the flying-wing configuration in transonic speed flow is presented with the intend to examine the changes of the flow characteristics in detail. As can been seen from the analysis, at sufficiently high angles of attack the dominant feature of flows over the leeside of the configuration is a pair of counter-rotating vortices. Solving the steady Reynolds-Averaged Navier-Stokes equations , the flow structures were exhibited in different angles and the analysis of total pressure, static pressure and axial velocity through wing vortex cores were presented in order to analyze the flow characteristics for the develop of the vortex. The investigation shows that the numerical method is accurate enough to capture the features of the flow especially the formation and breakdown of the leading-edge vortices. The rapid expansion of the vortex core and adverse pressure gradient the flow encounters in the chordwise direction affect the aerodynamic performance severely.
Transmission Noise Analysis of Gearbox Using Aluminum and Magnesium Cast Alloys Based on Structure-Acoustic Coupling Method
Authors: Wang Lian Sheng , Hao Zhi Yong
Published: April 2014

In order to study the characteristics of manual gearbox transmission noise, the sound insulation performance of gearbox was analyzed with the structure-acoustic coupling method. The constraint modal and sound transmission loss between aluminum alloy (ADC12) and magnesium alloy (AZ91D) material gearbox was compared. At last, analysis results show that magnesium alloy gearbox overall weight fell about 33%, but its sound insulation performance got worse, so it is necessary to improve on the structure design and make its natural frequency to avoid noise peak frequencies. This method provides new ideas for gearbox lightweight design and noise optimization.
Key Technology of FD93-1500 Double-Fed Plateau Wind Turbine with Mechanical Properties
Authors: Sun Hong Mei , Sun Wei Jun , Gao Ming
Published: April 2014

In recent years, with the plateau, low-speed wind farm began to form new wind power development hotspots, influencing factors for the highland areas of low wind speed, low atmospheric pressure, low air density, low temperature, low humidity, high radiation, low temperature in the original double basis fed wind turbine on the impeller diameter by taking increased, optimal control strategy to improve the cooling unit, radiation, anti-corrosion, lightning storms and other key technology capability solutions, designed and developed FD93-1500 plateau double fed wind turbine, the unit has been successful in Golmud, Qinghai 50,000 kilowatts of wind farms to achieve batch installation, became the first application of 93 m rotor diameter 1.5MW wind turbine wind farm projects plateau region, to fill the gap.
Testing Analysis on Load Transfer of Tractor-Semitrailer Steering and Braking
Authors: Gao Hong Bo , Xu Hong Guo , Liu Hong Fei , Zeng Cheng
Published: April 2014

An algorithm about tractor-semitrailer longitudinal load and lateral load transfer amount was proposed in order to research the driving stability of tractor-semitrailer steering and braking. A dynamic simulation model of tractor-semitrailer including load transfer was established by using S-Function. The results show that the model including load transfer is more actual than conventional model to describe the driving stability of vehicle Further analyzed the effect of factors on load transfer when tractor-semitrailer steering and braking.
Engineering Mechanics in Whipping Effect of High-Rise Building
Authors: Yang Lu Jiang , Liu De Wen , Guo Zhong Li , Li Jing , Dai Bi Hui
Published: April 2014

When the vertical stiffness is fixed up uneven, and there is some prominence in top, or he vertical stiffness changes suddenly, the amplitudethe and horizontal displacement of the top in high-rise building will increases fiercely, this phenomenon is whipping lash effect. It is harmful to the whipping lash effect in the top of the high-rise building when it is forced, moved and deformed, the phenomenon of whipping lash effect is evident in high-rise building. In order to research the essence of the whipping lash effect and avoid it, firstly the whipping lash effect is introduced, also we have distinguished the whipping lash effect and cantilever structure by analysising the non-statically structure and statically structure. Then we have made three different high-rise building models which are put on the dead load, live load and horizontal seismic load, also we have gotten the maximum displacement, maximum displacement angle, velocity, acceleration, shear force and moment, then we have analysised and compared displacement, movement and force. Finally, we have concluded:“The vertical stiffness should be fixed up consistency and changed uniformly in order to reduce the influence of the whipping lash effect in the high-rise building.
Simulation and Experimental Study of Floating with Engineering Mechanics on Box Girder Steel Interior Formwork Used in the High Speed Railway
Authors: Li Jian Ping , Tan Pin , Huang Jin , Wang Xiang Jun
Published: April 2014

During the construction of high speed railway box girder, the interior formwork’s floating problem is always been a big common quality fault plagued the construction in the process of concrete pouring, this leads to the roof thickness of box girder arising, the harm is great. This paper combined the construction project of Hebang single linear 32 meter interior formwork, according to the actual condition of the construction, proceeding the simulation analysis and experimental study of floating date on box girder interior formwork. Using the solidworks2010 establish the mode of box girder interior formwork, then, import the mode to the workbench14.5 proceeding simulation analysis. The simulation analysis of interior formwork maximal floating date is 10.67 millimeter, while the measured date is 10.63 millimeter, the deviation is 3.2%. The result manifests the feasibility of the simulation analysis of interior formwork floating date, this provide a reference to the structure optimization of the interior formwork used in the high speed railway.
Simulation Study of Dynamic Response on Box Girder Steel Side Formwork Used in the High Speed Railway
Authors: Li Jian Ping , Huang Jin , Ruan Jie , Wang Xiang Jun
Published: April 2014

In the high speed railway box girder construction,for the web is narrow and with a lot of rebar,and furnished with prestressed channels,insert-type Vibrators alone can not fully guarantee compacting concrete. It is easy to cause the phenomenon such as honeycomb, pitting ,surface hole,seriously affect the quality of construction,The plate type vibrator is commonly used for auxiliary vibration at the construction site. This paper combined the construction project of Hebang single linear 32 meter side formwork ,according to the actual situation of the construction, the use of the plate type vibrator are analyzed in the simulation.Using the solidwork2010 established a high speed railway box girder side formwork model,then import the model into workbench 14.5 to do the analysis.Simulation values comply with the relevant standards,provides theoretical support for the plate type vibrator system for use in high speed box girder beams construction.
Engineering Mechanics in High-Rise Building with Irregular Planner
Authors: Yang Lu Jiang , Liu De Wen , Guo Zhong Li , Li Jing , Dai Bi Hui
Published: April 2014

Plane functional layout and total controlling plan of the general plan in the building always are abnormal. Furthermore the floor size and horizontal stiffness in the same floor are different tremendously, otherwise there are many dislocation floor in the same floor, according to different function in the same floor. Irregular plane in the building may happen according to the situation above. It is harmful to the force,, displacement and deformation in irregular plane. In order to research the essence of the irregular plane and avoid it, firstly the irregular plane is introduced, also we have distinguished stretch joint, settlement joint and, seismic joint according to the force theory of structure, and then we have used PKPM structural calculation program to build model, simulating the force in two improved models on the dead load, live load and horizontal seismic load, we have gotten the maximum displacement, maximum displacement angle, velocity, acceleration, shear force and moment, then we have analysised and compared displacement, movement and force. Finally, we have concluded:“Architectural design should be adopted by regular plane designing rule，it should not be adopted by irregular plane designing rule；for the building structure which body is complex and irregular plane，the designer should install the seismic joint in the appropriate parts according to actual needs，make the irregular building structure into several regular unit structure which could resist the horizontal load.”
Analysis and Prevention of Early Commercial Concrete Crack with Material Properties
Authors: Zhang Li Wei
Published: April 2014

Concrete in constant access to technology development, intensification of its early shrinkage cracks caused by problems in the early works become an urgent problem. Early modern concrete easily explained reason for cracking of early age cracking depth analysis of the formation mechanism. And on this basis, the proposed early modern concrete cracks crack control philosophy to early shrinkage of concrete cracking on the goods to instruct the control, service and engineering.