bluuebunny/crossref_metadata_2025 huggingface dataset:
The Summary of AGV Guidance Technology
Authors: Long Jing , Zhang Chun Liang
Published: November 2012

AGV is short for automated guided vehicle. AGV is unmanned automated guided carriage car equipped with a non-contact guidance with microcontroller as controlling core and battery as power. The basic functions of the AGV are driving automated, recognizing the site to stop and transfering loads. AGV has been more widely used, because it is a key equipment of flexible manufacturing systems and an important mean of modern logistics systems. Guidance technology is the most critical core technology in AGV system. In this paper the author consult a lot of relevant books and mainly compares principle of a variety of AGV navigation technologies ,analyzes the advantages and disadvantages and forecast the trend of the agv guidance technology development in the future so that relevant researchers can do further research.
The Research and Design of Liquid Level Control System Based on Computer Nerve Network
Authors: Zhang Li , Wang Jian Hui , Zhu Hou Yao
Published: November 2012

This thesis mainly elaborated the PID neural network feed-forward algo-rithm and back propagation algorithm and the structure form of its controller, then make use of MATLAB to simulate the liquid level adjusting system, analysis its control perform-ance and choose appropriate neural network parameters, and compared with the traditional PID control effect, analyzes the advantages of PID neural network. Through the comparison with the conventional PID control, PID neural network is superior to the traditional PID. The traditional PID control tuning parameters has a large number of thumb rules for reference, but the setting out of the parameters is not necessarily good. And sometimes we have to modify the parameters if we wound the better control effect. PID neural network is set up as long as the learning step in accordance with the PID rule set. this paper has show that Liquid Level Control System based on Computer Nerve Network has good control effect of rapid and effective.
A Simple Data Acquisition Software for Serial Devices Based on Excel VBA and its Application in Rotary Kilns
Authors: Yao Jing , Du Qi Liang
Published: November 2012

In order to collect field data of rotary kilns for detailed analysis before automatic control system were designed and implemented, a simple data acquisition software for serial devices on the basis of Excel VBA was introduced in this paper. The serial communication module was coded with MSComm control. Data were presented both in tables and curves by the charting tools of Excel. A modified 53H algorithm was presented for online abnormal value detection while several data filtering functions were provided. Organized workbooks and worksheets were used as storage structures rather than a database system. Its application in a Lithopone rotary kiln proved its effectiveness in data acquisition, storage, query and preprocessing. This kind of simple data acquisition software has advantages in economical efficiency and simplicity, and is suitable for data acquisition applications with low sampling rates.
Simulation Research on the Control Performance of CVT Starting-Clutch
Authors: Liu Jin Gang , Zheng Shao Qing , Chen Jian Wen , Li Shao Yun
Published: November 2012

Aiming at the control problem for starting-clutch of CVT vehicle, the control goals have been analyzed for different stages, for the principle that decrease jerk and friction work, the fuzzy control algorithm have been proposed. The complete vehicle model is modeled combining engine model with clutch dynamic model, clutch hydraulic model, resistance torque model and engagement pressures model. According to the complete vehicle model, different starting simulations are gained by changing the throttle opening and change rate. It can be seen from the simulation results, both the jerk and friction work are restricted within a reasonable range after the fuzzy control algorithm is adopted, which brings relatively smooth startup and enough service life for clutch. The engine has small speed variation during the startup process, which reduces fuel consumption and noise effectively.
Feedback Linearization Control of Pmssm Based on Svpwm
Authors: Wang He Hua , Liu Xiao He , Ma Ming Jie , Yang Cheng
Published: November 2012

In this paper, according to the AC permanent magnet synchronous servo motor of the laboratory, using appropriate method to deal with servo motor makes its physical model be established. The nonlinear dynamic mathematical model of permanent magnet synchronous servo motor is established on the basis of the physical model. Based on nonlinear dynamic mathematical model of the permanent magnet synchronous servo motor, and through the coordinate transformation and state feedback, the input-output linearization is realized and the system decoupling is achieved. According to the system's linear model, a speed tracking controller is designed. The Simulink model of Svpwm is established. The control algorithm and the model of Svpwm are verified based on theMatlab7.6/Simulink & SimPowerSystems toolbox. The simulation results show that the controller designed has a very good control effect while the feedback linearization design is simple.
The Application of Kano Map in the Design of Relay Logic Control Circuits
Authors: Zhou Qing Hong
Published: November 2012

Relay logic control circuit also known as chain control mode as a kind of traditional electric drive control mode, with its low cost, easy to implement, easy to master, strong anti-interference ability, the requirement of environment temperature is not high, easy to repair and other features, that holds a very important position in the industry control domain. This paper gives the new method of using Kano map to designing a relay logic circuit. Firstly, according to the demands of the object, draws the control truth table, writes the logic expression function, carries on the simplification using the Kano map to the logical function, deals with “competition” and “risk”, then the circuit could be got. A practical example is added to explain the designing method and procedure. Hence, give a systematic designing theory of relay logic circuit.
Application of Zero-Vector Control to Three-Phase Inverter
Authors: Chen Jeng Yue , Chen Tsung Cheng , Chen You Sheng , Chiou Gwo Jen
Published: November 2012

In this paper, a new application of three-phase inverter using zero-vector control is proposed. In order to control the amplitude of output current, the d-q axis coordinate transformation, hysteresis controller and space vector strategy are adopted. Besides, the frequency of output current also can be adjusted by zero-vector control. Therefore, the proposed inverter has lower switching loss, higher system efficiency and better dynamic response. Use VisSim simulation software and TI TMS320F28335 chip to implement the proposed control strategy. The controller has several advantages such as easier to control, smaller circuit size and fully digital design etc. Finally, the experimental results are compared with the proposed theory for verifications.
Workshop Layout Optimization Based on Genetic Algorithm
Authors: Qiao Long , Yu Hong Bin , Sun Jian Jun
Published: November 2012

To shorten the transfer time of workpiece in job shop, it is necessary to optimize the equipment arrangement of job shops based on the technological process of workpiece. The objective function only considers the material handling costs, but it ignores the geometry of the workshop area utilization and so on factors. We propose and take an objective function that considers material handling costs and utilization proposed at the same time. And we set up an optimization model of facility layout is proposed and genetic algorithms is used to solve this mode1. The author brings forward the concept of carry quadrature for the first time. It is good to use this concept for the workshop in which many kinds of workpiece are produced. The result of optimal design is consonant with the desire of actual manufacture.
The Application of RAM Analysis in a CNC System
Authors: Nguyen Tien Long , Wang Yi Qiang , Zhao Yan Hui
Published: November 2012

The reliability, availability and maintainability (RAM) analysis of a computerized numerical control (CNC) system is helpful for performing design modifications that are required to achieve minimum failures or to increase the mean time between failures (MTBF), to plan maintainability requirements, to optimize reliability and to maximize equipment availability. To demonstrate these benefits, this paper presents the application of RAM analysis in a CNC system. The Weibull approach is used to model the CNC system behavior. After determining the steady state solution for the CNC system behavior, the corresponding values of reliability and maintainability are estimated at different mission times. The computed results proved to be helpful for analyzing the CNC system behavior, which enabled a considerable improvement of the system performance by implementing suitable maintenance strategies.
Research on the Application of the Electro-Hydraulic Digital Valve Control in the Lifting Device
Authors: Qu Jin Tao , Wu Zhang Yong , Wang Xian , Duan Zhen Hua , Liu Yun Han , Gao Xiao Yan
Published: November 2012

Aiming at solving the problems existing in a lifting device of electrolytic lead residual anode washing production line, this article proposes an solution on basis of the electro-hydraulic digital valve control system, then simulates the improved system using the software of MATLAB, the results show that the improved system has better repeat precision, simpler operation and maintenance and stronger anti-jamming capability by using the electro-hydraulic digital valve control technology; adopting the hydraulic cylinder as powerplant avoids the impact load during operation and gets a better control accuracy of the anode plate’ velocity and position; the high precision double cylinder synchro-control system is achieved by using the master-slave control strategy.
Study of the Engineering Vehicles of Automatic Transmission Shift Schedule Based on Fuzzy Neural Network
Authors: Huang Yong Jing , Yao Jin , Han Jia Hua , Wu Di
Published: November 2012

By combining the powerful self-learning ability of the neural network and the characteristic that the fuzzy control is designed based on the strategical rules of knowledge and language, this paper put forward the strategy of engineering vehicles' automatic transmission shift. According to a large number of experimental data, as well as the drivers' experience and the experts' profession, this paper put forward the strategy of engineering vehicles’ automatic transmission shift. The neural network model is set up based on Takagi-Sugeno and the factual cases are used to train and exam by MATLB, the simulation result showed that this method is feasible and meet the shift requirement, as it can accelerate effectively the establishment of the rules and reduce the set up time. The shift schedule can reflect precisely the actual out put target gear and meet the shift requirement.
The Decision-Making for Fault Diagnosis Based on Consistent Approximation Space
Authors: Chen Lian , Xiao Ming Qing , Sheng Sheng , Ma Yan Tao
Published: November 2012

Due to vary kinds of factors, test results for a weapon system may be incomplete and hard to make decisions for fault diagnosis. Aimed at the problem of the weapon system inconsistent decision-making for fault diagnosis, introduced the method of consistent approximation space. Firstly the definition of inconsistent decision-making information system was brought forward, and then the consistent approximation space was formed. Attribute reduction for the consistent approximation space and an approach for rule amalgamation were also presented. Finally, a case was used to prove this method; the result shows that the method of consistent approximation space can solve the inconsistent decision-making for fault diagnosis problems effectively.
The Design of Jet Vane of Thrust Vector Control System
Authors: Wang Liu Min , Mo Bo
Published: November 2012

According to the thrust vector control requirements of fast turn of the missile vertical launching, this design carries out the force analysis of the jet vane which is in the high temperature and high speed jet stream, and calculates the normal force which is generated by the vane, thus calculates the area of the jet vane. At the same time, according to the aerodynamic theory and engineering experience, this design analyzes and calculates the aerodynamic shape of the jet vane. As a result, two types of jet vane are designed. On this basis, through the use of a fluid analysis software FLUENT, both of the two jet vane are simulated and get a jet vane which is more suitable for the practical applications.
A New Control Method of Active Absorption Wave-Maker
Authors: Li Hong Wei , Pang Yong Jie , Zhang Guo Cheng
Published: November 2012

The theory of 2D wave generation with active wave absorption is outlined. A new control method of active absorption wave-maker is established based on the S plane control (SPC) algorithm in this paper. Using SPC, a piston-type 2D numerical wave flume (NWF) simulation program for simultaneous wave generation and active wave absorption is developed with Boundary Element Method (BEM) and Mixed Eulerian-Lagrangian (MEL). The absorbing wave-making contrast simulation tests for regular wave are also carried out in NWF. Simulation results verify that the controller is robust and well effect for absorbing re-reflected wave is obtained in low reflect condition. Meanwhile, stable wave profile can be output by the absorbing wave-maker in a long time when acute reflected waves appear in the terminal of NWF.
Research on Thermal Tactile Perception of Human Fingertips Using Temperature Control Device
Authors: Zhang Guo Hua , Bai Jun Jie
Published: November 2012

The thermal tactile perception principle of human finger was analyzed. Based on STM32 processor, the high-speed, high-precision, adjustable temperature control device was designed. Using the temperature control device, thermal tactile perception characteristics in human fingertips were studied, including maximum temperature, minimum temperature, and comfortable relationship in fingertips, temperature resolution ability, temperature remembrance ability, waveform recognition ability of temperature variation. Experimental results are as follows. The temperature resolution ability is higher near the body temperature in human fingertips, and the temperature resolution ability reduces when the temperature is too high or too low. The perception accuracy of temperature memory can improve effectively after training, and the perception accuracy of continuous touch is higher than discontinuous touch. The recognition rate of square wave is higher than triangle wave in temperature waveform recognition.
Application of PDA Industry Data Acquisition System in Analysis of the Reason of Strip Blocked in Hot Mill
Authors: Hu Su Ying , Yu He Bao
Published: November 2012

PDA, one product from iba AG, is one open progress data acquisition system used for automatic control system. After the simple introduction about the PDA, an application in AISC hot-strip Rolling Mill was shown for analyzing the reason of strip block. The fact showed that the PDA system had many advantage, high sampling rate, highly real-time performance, highly stability, and provide impersonal and accurate evidence for driven system commissioning. Also, this system could record data for fast fault analysis and time sequence analyzing of AUTO control system.
Toyota Prius Control Strategy Experiment Analysis
Authors: Sun Yuan Tao , Zhang Hong Tian , Wang Yun Long
Published: November 2012

After analyzing Toyota prius power assembly’s configuration, operation principle , control system and communication conditions among components, adopting theory analysis and car conditions testing methods, declare the requirement torque of transmission’s input shaft, engine output torque, motor output torque and friction brake torque, do comparative analysis of components’ torque and SOC condition under engine single drive, motor single drive, engine drive together with generator working, engine and motor drive together four drive conditions. Acquiring relation among components torque, building basis for following understanding and analyzing prius control strategy. Describe the phenomenon in the experiment.
A Method of Constructing Electric Power Data Warehouse Based on Cloud Computing
Authors: Wang De Wen , Xiao Kai
Published: November 2012

Hive is a data warehouse architecture in cloud computing. In order to solve the inadequate of massive data storage, query, and computing power in current electric power data warehouse, a method of electric power data warehouse based on Hive is proposed. Combining data analysis demands of electric power entreprises, the integration architecture between Hive and column-oriented storage is designed in electric power data warehouse, and the process of which is also given. At last, electric power equipment condition data is used for experiment on Hadoop cluster, results show that this method can quickly achieve query and analysis in massive multidimensional data set.
Vehicle Active Chassis Integrated Control Based on Multi-Model Intelligent Hierarchical Control
Authors: Zhao Shuen , Li Yu Ling
Published: November 2012

According to the characteristics of the vehicle active chassis system, multi-model system including Electric Power Steering System (EPS), Anti-lock Braking System (ABS) and Semi-active Suspension system (SAS) is established. Then, using the strategy of intelligent hierarchical control, the coordinated controller of active chassis system is designed. The bottom layer controller includes 3 separate controllers, i.e., suspension, steering and braking system controllers. They are used to carry out different control tasks and achieve performance indexes of subsystems. The upper layer coordinated controller is used to judge the vehicle states. At the same time, combined with the vehicle chassis coordinated control logic and the characteristics of feed-back information coming from the bottom controllers, the upper coordinated controller make whole coordination and control decision-making to vehicle active chassis subsystems. The simulation results show that the intelligent hierarchical control can improve the vehicle operational performances effectively.
Comparison on Three Filter Methods in Self-Alignment for SINS of the Carrier Craft
Authors: Wang Yong Jun , Xu Jing Shuo , Song Rui Hua , Gao Yang , Di Ya Zhou
Published: November 2012

Fuzzy adaptive filter and H∞ filter are introduced to solve the problem of low filter performance, which comes from uncertain noise caused by seawave and high frequence vibrancy. First, basic principles of the fuzzy adaptive filter and H∞ filter are formulated. Second, state space model of self-alignment for SINS of the carrier craft is built. Finally, according to each character, a comparison on results that Kalman filter, fuzzy adaptive filter and H∞ filter are applied to alignment for SINS of the carrier craft is made. Simulation results show that although Kalman filter has definite robustness to external uncertainty noise, weak anti-jamming ability and bad filter performance make self-alignment failed. Fuzzy adaptive filter and H∞ filter have strong ability to suppress external uncertain noise and can obtain good filtering accuracy. They both can complete self-alignment. Filtering accuracy and rapidity of fuzzy adaptive filter are better than those of H∞ filter, while robustness and curve smoothness of H∞ filter are stronger than those of other filters.
Novel Label-Free Cells Structure Detection Method Study Based on Mie Scattering Principle
Authors: Zhang Lu , Li Zong Yao , Zhao Hong , Chen Wei , Yuan Li , Yao Nian Ling
Published: November 2012

Cell health situation relates to its inter structures closely. Cell scattering measurement can be a non-invasive measurement method to obtain cells structure information. But normal scattering detection by original scattering spectrum can not identify cells inner structure changing, such as nucleus radii difference. Traditional scattering spectrum analysis method for identifying cells is to plot the forward scattering (FS) light intensity against side scattering (SS) light intensity. Overlapping phenomenon always occurs which leads to serious error or even mistakes in cells identification results. The Novel even scattering angle superposition algorithm and even incident angle superposition algorithm are put forward herein. In this way, the same kind of cells with different inner structures can be effectively distinguished. The rapid, convenient and label-free cells assorting and detecting can be therefore well accomplished, and these novel methods could be a kind of important diagnostic tool in cancer or other malignant cells diagnosis.
Initial Alignment on Moving Base for GPS/INS Integration with the Effect of Time Asynchronous
Authors: Wu You Long , Wang Xiao Ming , Cao Peng
Published: November 2012

To improve the accuracy of the navigation system, the effect of GPS measurement delay on initial alignment of GPS/INS is analyzed and the GPS/INS integrated navigation error models are presented in this paper. The H filter is adopted in designing the in-motion alignment scheme realized by velocity matching, where the disturbances in measurements are not fully known. To improve the alignment accuracy on moving base with the GPS measure delay, a H∞ filter approach based on minimax criterion is presented. To validate the proposed robust algorithm, the simulation under the two typical vehicle maneuver trajectories is carried out. The simulation results demonstrate that the proposed H∞ filter approach can achieve the initial alignment more quickly and more accurately comparing with the conventional Kalman filter approach.
Road Edges Detection of a Novel Travel Aid for Visual Impaired People
Authors: Ying Jie , Xu Shan Shan
Published: November 2012

A road edges detection method of a novel electronic travel aid for the blind was proposed. Road edges extraction was realized by Canny filter and Hough line transfer. Multiple lines detected by Hough transfer were processed into one edge line. Road deviation judgment method was proposed to determine if the user has deviated from the road by judging the position and angle of the edge lines. Experiments showed that the correct extraction rate of road edges was 93%, and the road deviation judgment method was effective and fast. Experiments were done using the consecutive stereo image sequences captured on road.
Study on Investigation of Underground Metal Object with Transient Pulse Electromagnetic Method
Authors: Lang Jian Jun , Jiang Qi Gang , Cui Han Wen
Published: November 2012

In recent years the transient electromagnetic pulse method theory has been developed rapidly in the world. In this paper, we focus on an electric probe method, it has many advantages to penetrate the high resistance ability, small effecting of the random manual source of disturbances, easy construction, simple measured, high efficiency and low geological affects. Currently Transient electromagnetic pulse method is one of best means to detect underground metal. Measured by the secondary field theory [1] after the power turn off at the primary field has widely used in resource exploration and engineering investigations. So far, the transient electromagnetic pulse method has been developed rapidly and ready to be used in geophysical exploration method field.
Development of Signal Conditioning Circuit of a New Strain-Crack Detecting System
Authors: Wang Hao , Zhang Yi Shan , Yuan Shen Fang
Published: November 2012

Crack and strain detecting is an important part of Structure Health Monitoring for aircrafts in fatigue environment. A signal conditioning circuit of a new strain-crack detecting system is developed in this paper. This circuit can deal with both intelligent coating sensor and strain gage, which have a great different original resistance between the two kinds of sensors. Comparing to the Wheatstone Bridge, when the strain is being detected, the new circuit gets rid of the influences of the lead-wires and decreases the wires’ number. The principle and the constitution of the circuit are introduced. And the circuit’s performances are demonstrated by a series of experiments. The linearity error is small and the stability is good.
Study on Multi-Parameter Monitoring Instrument Based on GSM Network
Authors: Chen Ge Hua , Liu Yi Zheng
Published: November 2012

A wireless real-time detection instrument for human health status based on GSM Network is presented. It can real-time monitor the ECG, pulse rate, oxygen saturation, body temperature and other parameters of human body. It has its own characteristics in being small and easy to carry with. Since the coverage of GSM network is broad and inexpensive, the real-time monitoring data of this instrument will be sent to the hospital or ambulance station. If there are any anomalies, the automatic SMS will be sent to patient’s family members, and an emergency telephone will be dialed to win the valuable time of the rescue. The high-end products with GPS positioning function can automatically inform the specific location of the patient, and the patient can be helped in the shortest time for emergency treatment in the case of his loss of active consciousness.
Application in Deformation Monitoring Signal Based on Wavelet Modular Maximum Algorithm
Authors: He Yong Hong , Wen Hong Yan , Jin Peng Wei
Published: November 2012

In the deformation monitor data, the noise exists inevitably. According to the different dissemination characteristic of the signal and the noise in the different scale, Wavelet modular maximum de-nosing algorithm combines the method of threshold de-noising with scale trading theory by Witkin, and picks out modular maximum value of the noise, makes use of Modular Maximum value of the signal to recover the coefficients of different scale efficiently, until recovers the signal. Contrast to the traditional threshold value and translation invariance, the processing result shows de-nosing method based on wavelet modular maximum can pick out the noise in the deformation data, protect the original information, have a better effect on de-noising, enforce the signal to noise ratio,Wavelet modular maximum de-nosing algorithm is a effective method in the deformation monitor data processing.
3D Solid Finite Element Modeling and Rotordynamics of Large Rotating Machines: Application to an Industrial Turbo Engine
Authors: Ma Wei Meng , Wang Jian Jun
Published: November 2012

An industrial turbo engine is modeled and meshed in ANSYS using solid elements. A rotordynamic analysis of the selected parts of the turbo engine is performed. For the unbalance response prediction, a novel method for modeling unbalance in 3D solid rotor model is presented and validated using a simple rotor model. In order to reduce the model order degree, transfer functions of the casing and bearings are generated and incorporated into the rotor-bearing system to account for the influence of elastic support stiffness on the rotor system. Modal and unbalance response analysis is performed on the 3D solid finite element rotor-bearing model using the unbalance modeling method presented in this paper. The results obtained from modal and unbalance analysis are compared and discussed.
The Spectral Leakage Minimization of Spectrum for Motor Fault Analysis Using Adaptive Multi-Taper Method
Authors: Treetrong Juggrapong
Published: November 2012

This paper proposes a new method of motor fault detection. Adaptive MTM is proposed as a key technique for motor fault analysis. Standard spectrum has always processed a time-signal into frequency domain with spectral leakage contamination. The leakage results important small harmonics to be invisible which makes the spectrum difficult to analyze the motor faults. The spectrum from the Adaptive MTM is introduced to minimize the leakages. The method is tested on 3 different motor conditions: healthy, stator fault, and rotor fault motor at full load condition. Based on several sets of the experiments, the spectrum from the adaptive MTM can show all the harmonics clearly which make the method more powerful for fault analysis.
Optimal Design of Vehicle Power-Train Mounting System Based on Improved Particle Swarm Optimization
Authors: Pan Dao Yuan , Gao Xiang , Xia Chang Gao , Ding Hua
Published: November 2012

Applying the multi-dynamic theory, a dynamic model of the power-train mounting system of motor vehicles is established. An optimization model for the power-train mounting system is constructed, in which decoupling efficiency of six freedom vibrations is selected as objective function, and the natural frequency distribution of system as constraint condition, the stiffness and installing angles as design variables of optimization. Based on improved particle swarm optimization, as an example, isolation characteristics of a truck power-train mounting system are analyzed. The comparison between the optimal and original design shows that distribution of both the modal kinetic energy and the system natural frequency are more reasonable, that means NVH of the power-train mount system can be improved using the optimal design.
A Method for Sheath Flow Forming, Controlling and Detecting
Authors: Li Zong Yao , Zhang Lu , Zhao Hong , Kong Bing , Yao Nian Ling
Published: November 2012

An elaborated mechanism for sheath flow forming includes flow cell, vacuum pool, sample pool, syringes, valves, and tubes. Firstly the sample is drawn into the sample inlet of flow cell through vacuum generated with one syringe. Then, the sample and buffer are driven to pass the flow cell to form sheath flow by other two syringes. To visualize and evaluate the sheath flow, black ink is used as sample, and optical imaging system is adopted to capture the formed sheath flow. Sheath flows with sample width of 21μm and 37μm in diameter are formed in a flow cell with micro-square hole of the size 0.2mm×0.2mm when the syringes run in different speed.
Adaptation of Gershgorin Disk for Motor Fault Analysis
Authors: Treetrong Juggrapong
Published: November 2012

This paper proposes a new method of motor fault analysis. Gershgorin Disk is proposed as a key technique for processing all the 3 stator phase currents. Gershgorin Disk is broadly applied to estimate sources with unknown signal numbers. This paper introduces the technique for motor fault analysis. The method is expected to provide a high accuracy method of fault analysis. The Gershgorin Disk is tested with a source of 3 sinusoidal stator phase currents under different conditions. There are 3 different motor conditions: healthy, stator fault, and rotor fault motor at full load condition. Based on experiments, the method can show differentiation of motor conditions with high accuracy. They seem also to be able to indicate fault severity levels by observing radii and center of among the disks.
The Relationship between Contact Angle Difference and Equivalent Conicity of High-Speed EMU
Authors: Zhang Zhi Bo , Wu Ping Bo , Luo Ren , Gan Feng
Published: November 2012

This paper studied the relationship among the linear model of wheel/rail characteristic parameters, the contact angle difference, the equivalent conicity and roll angle. The standard and worn profiles of S1002CN, XP55 and LMA were matched with 60 kg/m rail separately. The results of the study show that the ratio of contact angle difference to equivalent conicity changes linearly along lateral wheelset displacement within 5mm. Taking rolling angle into consideration, the contact angle difference and equivalent conicity in nominal position (3mm) display a linear relationship. Just considering the contact angle difference and roll angle in the fitting formula for the wheel/rail linear model calculation, the quasi-linear calculation of the critical speed could be more accurate. Therefore, the wheel/rail linear model characteristic parameters roll angle and the contact angle difference in the nominal position have certain effect on vehicle dynamic performance like equivalent conicity.
The Noise Test System and Solution Measures of Vibration Test
Authors: Kong Shi Jia , Li Jin Yao , Yang Ming , Chen Jia Cong
Published: November 2012

The noise of the test system in the vibration test,is an important factor affecting the test results.This paper first introduce the classification of the sources of noise in the vibration test system,and explain the ways of noise interference and how to reduce the noise interference.Then given the specific measures to reduce the noise in the vibration test system,which can improve the precision and reliability of results of vibration test system.The paper has a certain significance in reducing the vibration noise.
Dynamic Responses of Supercavitating Vehicles under Non-Stationary Random Excitation
Authors: Song Xiang Hua , Zou Guang Ping , An Wei Guang
Published: November 2012

When the front end of the supercavitating vehicles subjects to very large axial non-stationary random excitation at high speed motion under water, it is necessary to analyze dynamic responses of supercavitating vehicles under non-stationary random excitation. The dynamical equation of supercavitating vehicles is transformed into the form of state equations. The Simpson integration method is going to calculate the integral term of the general solution of state equation to improve the precise integration method. The explicit expression of dynamic responses of supercavitating vehicles is deduced, the means and variances of structural responses are calculated with operation laws of the first moment and second moment. Under different sailing speeds and different cone-cavitator angles dynamic responses of supercavitating vehicles are given by the examples, and the effectiveness of the method was demonstrated.
Numerical Calculation of Hydrodynamic Interference Coefficients between Hull, Rudder and Propeller
Authors: Wang Xiao , Wu Ming , Ying Rong Rong
Published: November 2012

CFD developed rapidly in capability and practicality during past years. A lot of research works on numerical simulation of viscous flow field around ship were widely carried out in past decades. But the research of interference effect among the hull, rudder and propeller was rarely concerned. In this paper, based on an unsteady Reynolds Averaged Navier–Stokes method, the dynamic mesh methods(6DOF) are adopted to simulate straight line and oblique towing test of ship with twin propellers and twin rudders. And based on the simulation results, the interference coefficients, such as effective weak coefficient ωp, rudder’s effective longitudinal velocity uR, effective attack angle αR, rudder force’s modificatory factor αH for shiphandling derivational transverse force and its dimensionless distance to ship’s gravity point, are calculated. The computed results of this paper agree well with the experimental results carried out in the tower tank of ITTC. It shows that the methods on numerical calculation of Interference Coefficients between hull, rudder and propeller is successful.
Dynamic Parameters Estimation Based on Set Inversion and Interval Analysis Algorithm
Authors: Liu Bai Xi
Published: November 2012

In the paper, an approach, based on bounded-error estimation via interval analysis, is presented to identify viscous damping coefficient and Coulomb friction coefficient of such-rod pumping system of directional well. The approach assumes the error of colleted output data of suck-rod pumping system is bounded. Hence, the problem of parameter estimation can be viewed as that of set inversion, which will be effectively solved via interval analysis. The main advantage of the proposed method in comparison with the traditional estimation methods is that, as it is global, it bypasses the problem of initialization. Moreover, the method avoids amount error due to transformation of measurement output data. An identification example is given to show the correctness and efficiency of the proposed method.
Fault Detection of Electric Motors Application Using ML Estimation Method
Authors: Treetrong Juggrapong
Published: November 2012

This paper proposes a new method of motor fault detection. ML Estimation is proposed as a key technique for signal processing. The stator current is used data for motor fault analysis. ML Estimation is generally applied to estimate signals for nonlinear model. The expectation is that the method can provide information for fault analysis. The method is tested on 3 different motor conditions: healthy, stator fault, and rotor fault motor at full load condition. Based on experiments, the method can differentiate conditions clearly and be also able to measure fault severity levels.
Simulation Analysis of Control Strategy for TLT Wheel Coordination Based on Constant Pressure Network
Authors: Zhao Li Jun , Li Na , Fang Tao
Published: November 2012

Hydrostatic transmission with secondary regulation based on constant pressure network (CPN) has the advantages of stepless speedless regulation, high power density, etc. This paper applies it to a Towbarless Tractor (TLT) transmission system and aims to improve its wheel control precision. A control strategy for TLT wheel coordination under driving condition is proposed and simulation is carried out in our facing-backward simulation model. The results show that good control performance can be realized by the control strategy. It can effectively achieve the goal of antislip. Moreover, the simulation analysis provides significant reference values for further development of wheel coordination controllers.
Comparison of Two Two-Equation Turbulence Model Used for the Numerical Simulation of Underwater Ammunition Fuze Turbine Flow Field
Authors: Shen De Zhang , Zhang He , Li Hao Jie
Published: November 2012

To figure out the problem of turbulence simulation of underwater ammunition fuze turbine numerical simulation, respectively, realizable k-ε turbulence model and SST k-ω turbulence model are used for two-phase flow numerical simulation of the turbine rotation. The analysis compared the calculation results of the two turbulence models. The results showed that: the cavitation scale obtained from realizable k-ε turbulence model is shorter than that of SST k-ω turbulence model; turbine surface pressure distribution trends are similar of this two model, the results of realizable k-ε turbulence model are bigger than SST k-ω turbulence model; the turbine axial pressure coefficients using realizable k-ε turbulence model are also bigger than that of SST k-ω turbulence model, and the deviation increases with the speed increase.
The Effects of Ply Angle of Laminated Composite Plates on Wind Induced Vibration
Authors: Li Jin Qiang , Narita Yoshihiro
Published: November 2012

This paper presents an analysis on the effect of ply angle for laminated composite plates on wind induced vibration. With Hamilton’s principle and the Rayleigh-Ritz method, the equation of motion for the wind induced vibration is derived. The displacements in time domain and the mean-square value of the transverse response under wind pressure are studied for laminated plates with different ply angles. From the numerically simulation results it is seen that the ply angle of the laminated plate can significantly affect the wind induced vibration. For different rectangle plate the optimal ply angles of minimum displacement is different. The analytical methodology in this paper can be expanded to other kinds of random vibration such as water flow induced vibration.
Research on Similarities between Abnormal Rotor Model and the Prototype Based on Dynamic Similarity
Authors: Wang Ai Lun , Huang Li Kun
Published: November 2012

The natural frequencies of the reduced scale model are higher than that of the prototype, which make it quite difficult to conduct the experimental research on the dynamic characteristics of the rotor system by using normal rotor model. Aiming at this problem, this paper has deduced the similarity criterion of abnormal rotor model based on equation analysis, and the dynamic similarity conditions between abnormal rotor model and the prototype are also discussed. Next, the mass matrix and flexibility matrix are presented based on the lumped parameter model of the rotor system. Finally, the similarities among normal rotor model, abnormal rotor model and the prototype are comparatively analyzed. The results show that the natural frequencies of abnormal rotor model and that of the prototype are all the same while the radial scaling factor is the square of the axial scaling factor. And it provided the theoretical basis for experimentally studying the dynamic characteristics of the rotor system.
Analysis and Training in Sanda Movement Rotor Inertia Biological Mechanics
Authors: Liu Jin Song , Jing Ying Lu
Published: November 2012

Applying the viewpoints and methods of sport biomechanics, and from the conservation of momentum, we have analysed Sanda rotation technique and elaborated on Sanda movement inertia mechanical characteristics and requirements, to make Sanda coaches and athletes on the basis of these laws of Sanda technique teaching and training, and to achieve the best results of training and sparring competition results.
Research on Balancing Method for Inertia Force of Slider-Crank Mechanism with Small Linkage Ratio
Authors: Yuan Rui , Sun Yu , Fan Wen Hai , Wu Kai , Chen Zheng Jun
Published: November 2012

In view of the difficult balance of inertia force for the slider-crank mechanism, on the basis of analyzing inertia force of the slider-crank mechanism, a new balancing method of inertia force was proposed for the slider-crank mechanism with small linkage ratio, the rotary mass and the moving mass had replaced the mechanism mass, the inertia force of rotary mass was balanced by rotary weight counterbalance, a spring was disposed by slider, it provided variable elastic force and balanced the inertia force of moving mass. Then the balancing method was analyzed deeply and the theoretical derivation was made, the results show that this balancing method would achieved approximately balance for inertia force of the slider-crank mechanism with small linkage ratio.
Analysis and Control of Vibration Generated by High-Speed Spindle System
Authors: Wu Zhou Ping , Li Bei Zhi , Yang Jian Guo , Xue Peng
Published: November 2012

High speed motorized spindle plays an important role in high speed grinding. However, for high-speed machining, the spindle system usually generates excessive vibration due to the high speed and large mass. The vibration transfers to the bed of grinding machine and affects the precision of machining. To analyze and control the vibration generated by the spindle system, this paper develops a dynamic model for the high-speed spindle system, and further analyzes the eccentricity and the mass of the spindle system which affects the amplitude of the vibration of the bed by producing the impulse. Based on the result of analysis, the vibration is finally controlled by modifying the structure of the shaft. After optimization, the amplitude of the vibration of the bed of reduces significantly to 0.046um, which was 0.056um before. In addition the eccentricity of the spindle is decrease by 0.1um.
Improved EEMD on the Application Research of Signal Trend Analysis
Authors: Zhang Mei Jun , Wang Chuang , Cao Qin , Chen Hao
Published: November 2012

The trend of the measured signal can not only reflect the influence of the external environment, and also reflect the performance of the machine itself mutations. Therefore, removing and extracting tendency item is the necessary link in signal pretreatment.In order to eliminate endpoint effect and modal aliasing phenomenon in EMD and EEMD, based on EEMD,improved EEMD is put forward and the improved EEMD in the application of the signal trend analysis is researched in this paper.In the measured signals to join in a ramp signals,With the improved EEMD decomposition extracted residual items,and the residual items with the original slope signal similarity analysis,the similarity is 0.975.compared to EMD extracted residual items similarity 0.898, EEMD extracted residual items similarity 0.961,the improved EEMD extracted residual item can more accurately reflect the trend of signal.
The Finite Element Simulation of Crack Growth of a Wind Turbine Blade
Authors: Chen Chang Zheng , Zhang Yu , Zhou Bo , Zhang Shi Wei
Published: November 2012

The relationship between stress and crack growth was studied. Applying the software ANSYS, the method of calculating stress intensity factor of composite mode cracks was built. At the same time, the stress intensity factor of mode I crack was calculated and the influence of crack size and loading on the stress intensity factor was studied. The results show that the results of ANSYS are almost the same to analytic results, which proves that the method is feasible. When the crack is quite big or quite small, the result of ANSYS’ error is comparatively obvious, which is due to the problem of the refinement of meshing. When the crack is too big, the dense of meshing is inadequate.
Dynamics Response of Rails for Electromagnetic Launcher with Acceleration Load
Authors: Geng Yan Bo
Published: November 2012

One of the important problems in developing the railgun is design of the rail and the related elements. The evaluation of the loads on rails is an important task. On operation, the armature runs at an acceleration. The acceleration load can cause more complicated dynamic responses of the railgun. Here, the equations for the forced responses of the rail on acceleration load are developed. Using these equations, the dynamic displacement responses of the rail to the running electromagnetic force for various accelerations are investigated. The results show that the maximum dynamic displacement peak of the rail and its position depends on the acceleration of the running armature. The larger is the acceleration, the more obvious is the increase of the dynamic displacements under condition that the armature velocity is above the critical velocity. The results are useful for design and application of the railgun system.
Study on Fault Diagnosis of Rotating Machinery Based on Lyapunov Dimension and Exponent Energy Spectrum
Authors: Wang Bing Cheng , Ren Zhao Hui
Published: November 2012

In connection with the nonlinear dynamic characteristics shown from the performance of fault rotating mechanical system, the authors propose the analysis method of Lyapunov dimension and exponent energy Spectrum to the signal feature of mechanical fault. Using theory of phase space reconstruction, simulating fault signal of rotating machine is reconstructed. In order to reconstruct the phase space which can be adequately reflect the movement characteristics of the system, the time delay and embedding dimension are discussed emphatically, on this basis, calculated the Lyapunov dimension and exponential energy spectrum. From the analysis and calculation on simulation of different fault signals, it shows that under different rotating machinery fault conditions, its Lyapunov dimension and exponential energy are significantly different, which verifies that this two nonlinear feature quantities is effective parameters for fault information
The Current Situation Analysis of Industrial Design and Development Management Proposal Based on Manufacturing in Central Regions
Authors: Wang Li Li
Published: November 2012

With the development of the design industry, industrial design is becoming increasingly significant in manufacturing industry. Under the background of developing the manufacturing industry, industrial design based on the manufacturing industry in the central regions hasn’t been fully accepted or applied. This paper which taken Wuhan city in the central regions for example, analyzes the current development situation of industrial design firstly then provides a development management proposal of industrial design in the central regions based on the analysis above.