bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of Reheated Steam Temperature Multi-Model Predictive Control for 1000MW Ultra-Supercritical Unit
Authors: Chen Shi He , Zhang Xi , Yan Wei Wu , Wang Guo Liang
Published: February 2014

In this paper, targeted at reheated steam temperatures large time delay and strong nonlinearity characteristics in power plant, a multi-model predictive control strategy is proposed in light of the nonlinear characteristics of steam temperature control. This strategy utilizes the linearized model of nonlinear process at multiple working points to divide the process into several subspaces. A relatively accurate fixed model can be found in each subspace. Based on this, a global approximation model of complex object could be obtained. Simulation and application results show no matter for stable or load varying process, reheated steam temperature can be maintained in the required control range. It is much superior to the traditional PID control method.
An Overview of Synchronization Methods of Grid Fundamental Signal
Authors: Zhang Zhi Xia , Wang Jiu Long , Liu Chang Liang
Published: February 2014

The synchronization signals of the grid fundamental wave are applied to various fields, such as power protection system, power quality system, and large power grid interconnection. As new problems emerging during the development of the grid, the synchronization methods keep continuous improved. These methods appeared in accordance with the time sequence are zero crossing detection method, the maximum value algorithm, the Fourier transform method, filter method, and phase locked loop method. In this paper, the typical methods are studied and made analysis of their characteristics, which can be used as reference in the practical applications.
A Substation DC System Grounding Fault Analysis and Processing
Authors: Chen Gang , Li Zhong , Li Ping , Liu Lei , Wang Miao , Pang Yan Jun , Li Yan
Published: February 2014

A 220kV substation DC system ground fault detailed analysis and lookup scheme are proposed in this paper. The ground fault was mainly due to the cold weather as well as equipment wiring unreasonable wear the cable jacket rupture, causing 220kV main transformer cooler control box on the 2nd DC grounding occurred. In addition, through this ground fault finding, also found a DC system insulation monitoring device functional shortcomings and DC circuit loop back problems exist, the paper put forward DC circuit loop back detailed solutions, and the insulation monitoring device of the transformation proposal are proposed.
The High-Voltage Reactive Power Compensation Device Applications and Innovations
Authors: Dong Jun , Pang Yan Jun , Zhang Da Lin , Yu Zheng Zhi , Wang Qing Hao , Zhang Chang Bo , Liu Jing
Published: February 2014

This article briefly describes the modern power system of high-voltage reactive power compensation device development status, discusses the high voltage reactive power compensation device applications, with the traditional high-voltage reactive power compensation device matching, demonstration of a new generation SVC (Static Var Compensator) and SVG (STATCOM) advantages and application results. This paper focuses on the innovative technology in the new generation of high-voltage reactive power compensation device in the application, while a new generation of high voltage discussed reactive power compensation device application prospects.
Bayesian Networks in Electric Reliability Assessment of Doubly-Fed Wind Turbine Generator
Authors: Pan Hai Ning , Qin Ming , Zhang Jun , Chang Chao , Lei Pan
Published: February 2014

For the development of large wind turbines, the approach of trial and error is also not adequate for mass produced wind turbines, a reliability-concerned manufacturing must be involved for the future development. An approach which introduces probabilistic reliability assessment which incorporates reliability methods into wind turbine engineering is described. Fault Tree of wind turbine generators electrical components is firstly built. Then it is transformed to the Bayesian network and probabilistic distribution is preceded using Markov chain Monte Carlo inference. Finally a set of qualitative and quantitative reliability is given according to a specific probabilistic input.
Simulation Research of Hydraulic Powerplant Mount Based on Matlab/Simulink
Authors: Yuan Min , Chen Chong , Cui Pin Gan
Published: February 2014

Firstly mechanical model of hydraulic powerplant is established. Then mathematical model of hydraulic powerplant mount is established based on the analysis of mechanical model. And the simulation model is established in Matlab/Simulink. The results of simulation are attained by calculation. On the basis of aforementioned results, the analysis is made. Finally, this paper makes a summary and outlook.
The Decomposition Calculation Method of Large Interconnected Grid Probabilistic Available Transfer Capability
Authors: Zhang Xue Song , Zhao Zhi Qiang , Liu Shi Xin , Gao Chun Cheng , Yang Fei , Wang Hai Xia , Li Wei Dong
Published: February 2014

Concerning the uneven distribution of energy in Chinas regional power grid, power of big energy base should be transmitted through long distance. Therefore, calculating available transfer capability (ATC) of large interconnected grid is necessary. However, it is difficult to collect the needed data, so ATC of the large interconnected grid cannot be calculated directly. To solve these problems, this paper presents a decomposition calculation method to calculate ATC of the large interconnected grid. The basic principles are: According to the executive partition, the large interconnected grid is divided into several subsystems, of which ATC can be calculated directly and easily. Then, according to series or parallel combination between the subsystems, ATC of the large interconnected grid can be calculated indirectly by the obtained ATC of subsystems. The series and parallel ATC probabilistic calculation models are established, used for synthetizing ATC of the subsystems. Illustrations verify the correctness and feasibility of the calculation method.
Dynamic Characteristics Analysis for 1000kV UHV Steel Tubular Tower under Seismic Loading
Authors: An Li Qiang , Liu Yu Chu , Zhang Bing
Published: February 2014

In this paper, the dynamic characteristics of a 1000kV UHV steel tubular tower with double circuit transmission lines on the same tower are analyzed under seismic loading with 8 degrees fortification intensity. Firstly, the finite element model of the tower and simulation of the earthquake are built in ANSYS finite element software. The dynamic characteristics of steel tube tower under Seismic Loads, such as the time-domain curves of displacement, velocity and force of UHV steel tower under Seismic Loads are obtained. The impact of 1000kV UHV transmission tower under nonlinear vibration of simplified conductor model is studied. The results can help to understand the damage forms of UHV steel tower under earthquake, to improve the capabilities to resist earthquake loads and severe damage of environmental loads under various field conditions for UHV steel tower.
Modelling Wind Farm with Doubly Fed Induction Generators Based on Characteristic Fusion
Authors: Wei Dong Ning , Zhang Xue Min , Ye Jian Min
Published: February 2014

In this paper, a novel modelling approach based on characteristic fusion is proposed and used to build a static equivalent model of wind farm. Firstly, the modelling framework based on characteristic fusion is given. Secondly, the basic characteristics of wind farm including characteristic of wind turbine generator (WTG), wind speed spatial distribution and characteristic of wind farm are analyzed according to the framework. Then detailed modelling process is provided utilizing SVR as a fusion tool. This approach combines the advantages of both mechanism and non-mechanism methods with both satisfactory fitting ability and generalization ability. It only requires the maximum and minimum value of wind speed among the wind farm, rather than accurate wake model as mechanism method nor massive measurement data as non-mechanism method. Numerical simulation indicates the effectiveness and robustness of the proposed method. When available data is reduced or includes bad measurement, the proposed method can still keep favorable performance.
Power and Voltage Smooth Control of Doubly Fed Induction Generator
Authors: Ma An Ren , Wang Cai Xia , Zhou Zhi Wen , Wu Tao
Published: February 2014

Doubly-fed induction generator (DFIG) is the leading in wind power technology currently. In this paper, decoupling control of DFIG is studied and a new energy storage device is used in the smooth control of DFIG system’s power and voltage. This new method has a good characteristic on stability of grid-side power and voltage when the wind speed changes rapidly. In this paper, a simulation system based on this method is designed using MATLAB, the experimental results of simulation show that the method is correct and has practical value.
Design and Research of Engine Electronic Fuel Injection Simulation Experimental Platform
Authors: Liao Huan , Sun Yue Dong , Zhou Ping
Published: February 2014

To complete experimental platform for electronic fuel injection simulation, an electronic control system has been built. The system, which can control the fuel injection of engine precisely, connects the sensors, ECU, and the actuator device with buses. After testing the electronic fuel injection simulation experimental platform, we make the MAP with the data of experiment. The data is reliable, which can prove correctness of the control system, and the system can control the engines fuel injection.
The Research of Microgrid Optimized Dispatching Method Based on MEA
Authors: Wang Bao Yi , Wei Chen , Zhang Shao Min
Published: February 2014

Integration of large scale renewable energy sources and electric cars into power grid will bring new opportunities and challenges to the operation, control of the power grid and the power market .The microgrid , which integration the distributed generation systems, energy storage element and loads ,has been seen as one effective way to solve the problems. This paper proposed a MEA-based scheduling algorithm, and studied a microgrid that contains 32 nodes and 50 electric cars. Both the MEA algorithm and mixed integer nonlinear programming algorithm (MINLP) can solve the energy resource scheduling problem,but the results of our simulation shows that the total cost of MEA is higher than that of the MINLP,but there is a significant improvement in the efficiency of execution.The results shows that we can use MEA to achieve optimal scheduling,it also verify the effectiveness of the algorithm.
Study of Multi-Angle Optimal Load Distribution Based on Adaptive Immune Vaccine Algorithm
Authors: Yuan Gui Li , Xue Yan Guang , Yu Tong
Published: February 2014

Based on genetic algorithm (GA) and immune algorithm, adaptive immune vaccine algorithm (AIVA) takes advantage of immune memory and immune vaccines operator of immune algorithm, while using adaptive crossover and mutation operators of improved genetic algorithm. The algorithm can effectively overcome the shortcomings, such as the premature convergence of the basic genetic algorithm, the poor ability of local search and reduction of diversity. At the same time, it ensured the algorithm convergence and effectively prevented the degradation of the population. It also improved the convergence stability and convergence speed, shortened the searching time and improved operating efficiency. AIVA was applied for multi-angle plant level load optimal distribution considering the economy, environmental protection and speediness.
Design and Implementation of Grounding Line Intelligent Management System
Authors: Wang De Hai , Xu Jia Hao
Published: February 2014

In order to prevent improper connection between charged equipment and ground wires and fatal accidents of transmission error and improve the safety of the transmission line, this article introduces the design and implementation of grounding line intelligent management system based on the technology of RFID, GSM and GPS. This article describes the framework of the grounding line intelligent management system, software and hardware's design and implementation of the PDA terminals, server-side software design of PC and data transfer protocol between PDA and PC in detail. This system can do real-time monitoring job to the state information, connecting position and the task types of the ground wire all over the work area. It is well applied in some Power Supply Bureau.
A Novel Transmission Line Vulnerability Evaluation Method Based on Complex Network Theory
Authors: Du Zhi , Wang Gang , You Da Hai , Chen Wei Hua , Wang Ke , Zou Yang
Published: February 2014

As further development on the applications of CN (complex network) theory, evaluation of transmission line vulnerability requires the consideration of physical attributes of power system, instead of simply considering its topology features, which helps to deduce more precise predictions for the stability of power system. This paper introduces a novel and efficient evaluation method based on CN theory to evaluate influence of line faults to the static stability of power system, comprehensively considering the factors of system load level, power capacity utilization rate of transmission lines and worldlet features. The method is illustrated in the IEEE118 bus system.
Structural Analysis of a Tractor Chassis via FEM
Authors: Yang Can , Ke Jian Feng
Published: February 2014

This paper conducted a research to analyze the chassis of the tractor by finite element method. The four working condition of the chassis was analyzed in ANSYS and finally the stress and displacement nephogram was obtained. The research provided a way to improve the performance of the tractor chassis.
The Application of Wireless Sensor Networks in Power Engineering
Authors: Mu Rui Hui
Published: February 2014

The fast evolution of computer technology, sensor technology, MEMS and modern wireless communication technology has impelled development of wireless sensor networks. Wireless sensor networks are consist of a large number of nodes which can be capable of communicating, computing and cooperation in ad hoc model. In this paper, we study the application of wireless sensor networks in power engineering. A device for remote monitoring of electric towers is designed. This paper proposes the implementations of remote wireless centralized electricity meter reading based on wireless sensor network.
The Construction of Network Maintenance System for Smart Power Utilization District Focusing on Customer Service
Authors: Wang Yong Cai , Song Cai Hua , Yang Qiu Yong , Huang Yu Kui
Published: February 2014

Smart power utilization district is an important constituent of smart grid. Owing to the quantitative and complex of intelligent services, the network for smart power utilization is very complex, and it is very difficult to maintain the network by traditional processes and methods. We construct a network maintenance system focusing on customer service. The core process and module design of the system are based-on ITIL. We design its software system with MVC architecture style, and implement is with J2EE technology. To monitor network flow and devices, we apply network probes to monitor network flow, and apply internet of things technology to monitor the network devices.
Power Quality Signals Classification System Using Time-Frequency Distribution
Authors: Abdullah A.R. , Abidullah N.A. , Shamsudin N.H. , Ahmad N.H.H. , Jopri M.H.
Published: February 2014

Power quality signals are an important issue to electricity consumers. The signals will affect manufacturing process, malfunction of equipment and economic losses. Thus, an automated monitoring system is required to identify and classify the signals for diagnosis purposes. This paper presents the development of power quality signals classification system using time-frequency analysis technique which is spectrogram. From the time-frequency representation (TFR), parameters of the signal are estimated to identify the characteristics of the signals. The signal parameters are instantaneous of RMS voltage, RMS fundamental voltage, total waveform distortion, total harmonic distortion and total non harmonic distortion. In this paper, major power quality signals are focused based on IEEE Std. 1159-2009 such as swell, sag, interruption, harmonic, interharmonic, and transient. An automated signal classification system using spectrogram is developed to identify, classify as well as provide the information of the signal.
1-D Simulation of a Diesel Engines Injection Timing
Authors: Yin Qian Xi , Liu Yu , Feng Guo Dong , Wang Qing Dang , Bian Feng , Hu Hong Tao
Published: February 2014

Using GT-POWER to simulate a diesel engines injection timing, calibrating simulation model has been done according to experimental data. Analysis of the effect on engine power characteristics and emission characteristics caused by different pre-injection timing and main injection timing is the main work. The simulation results show that, the output torque and NOx increased when the injection timing is advanced. In contrast, the soot emission is decreased when the injection timing is advanced.
Technology of Vehicle Detail Parts Monitoring Based on CGI and IPv6
Authors: Song Zhi Peng
Published: February 2014

For the problem of the vehicle parts monitoring in the internet of vehicle, the service technology is proposed to access the detail components through the common gateway interface technology. The information transmission is managed using the common gateway interface and interface parts for docking, and the monitoring of detail parts is made by the bus integration monitoring. IPv6 virtual network address information transmission is used to avoid the hidden dangers of IPv4 address depletion, and the virtual and independent IPv6 address is transferred with the part number in the common gateway interface to achieve a wide geographical access. In order to achieve real-time information exchange and robustness, the real-time transport protocol and real-time transport control protocol is used to assure smaller transmission delay and less packet loss rate. The test results show that the average response time is no more than 85 nanoseconds and the accuracy of information transfer is not less than 98.2%, and the results meets the needs of the most environmental, and the program is viable in practice.
Design of Control System of Eddy Current Retarder Based on BP Neural Network PID Controller
Authors: Jin Fu , Sun Jian Jun , Yu Hong Bin
Published: February 2014

A new kind of algorithm of controller for eddy current retarder is designed in this paper. The eddy current retarder control system with traditional PID controller can't achieve a perfect performance in the rapid response. Back propagation (BP) neural network is one of artificial neural networks which has a good learning ability with a simple and recurrent structure, so it is suitable for controlling complicated eddy current retarder system. This paper introduces the principle, characteristics and learning algorithm of the BP neural network and designs the control system of eddy current retarder based on BP neural network PID controller by combining BP neural network and traditional PID. Making use of MATLAB, simulate this new kind of controller for eddy current retarder in the rapid response. Simulation results show it can improve the dynamic response performance and enhance the static precision compared to the traditional PID controller.
Dynamic Modeling and Simulation on a Hybrid Power System for Dual-Motor-Drive Electric Tracked Bulldozer
Authors: Wang Hong , Sun Feng Chun
Published: February 2014

Hybrid power systems provide high-performances and high-efficiency power for electric bulldozer. This paper firstly constructs the mathematical model of driving motors system based on the design of dual-motor-driving propulsion system for bulldozer. Secondly, by using the setting values from a bulldozer, simulation work is implemented, and parameters of the hybrid power system are matched, and finally, based on MATLAB/Simulink ,dynamic models for the dual-motor-driving hybrid power system is established, and the simulation results are discussed. Simulation results demonstrate the validity of the hybrid power system model and the matching of the parameters of the hybrid power system is reasonable.
The Virtual Simulation of Electric-Drive Mechanical Transmission
Authors: Shan Wen Jie , Wu Sen , Zhang Cheng Cai
Published: February 2014

This paper studies the electric-drive mechanical transmission-EMT which integrates motor and mechanical transmission system. The system follows the principle of power-train integration, the paper uses the CATIA software for virtual manufacturing and assembling, through the written simulation program, using Matlab software transmission to design module simulation studying of the institution, to verify that the three grades EMT system is better in efficiency and fuel economy performance, to provide theoretical research guidance for the product designing.
Electronic Control Unit Design of Electronically Controlled Air Suspension (ECAS) for Vehicle Based on Freescale Microcontroller
Authors: Liu Xin Qiang , Yan Tian Yi
Published: February 2014

With the development of automotive electronics industry, the car which has electronically controlled air suspension is gained wide application. we designed an electronic control unit of automobile electronically controlled air suspension system (ECAS) including the hardware system which include the speed signal collection and processing circuit, the solenoid valve drive circuit, the CAN communication design, height detection circuit, Freescale microcontroller etc and the control strategy while propose some the basic ideas, based on Freescale microcontroller, after introducing the composition and the principle of electronically controlled air suspension. The ECAS can improve vehicle fuel economy, ride comfort and traffic-ability.
Modeling and Simulation Research on Lithium-Ion Battery in Electric Vehicles Based on Genetic Algorithm
Authors: Lin Cheng , Zhang Xiao Hua
Published: February 2014

Based on the genetic algorithm (GA), a novel type of parameters identification method on battery model was proposed. The battery model parameters were optimized by genetic optimization algorithm and the other parameters were identified through the hybrid pulse power characterization (HPPC) test. Accuracy and efficiency of the battery model were validated with the dynamic stress test (DST). Simulation and experiment results shows that the proposed model of the lithium-ion battery with identified parameters was accurate enough to meet the requirements of the state of charge (SoC) estimation and battery management system.
High Voltage Safety Management System Design Based on Functional Safety
Authors: Zhang Chao , Cui Shu Mei , Xu Shi Ming , Liu Hua Feng
Published: February 2014

High voltage system as power source is applied to electric school buses. In this paper, failures and potential risks of high voltage system are analyzed according to the electric school bus high voltage system configuration, and the high voltage safety management system is designed with ISO26262 as a functional safety standard. The strategies of system diagnostics and safety management are proposed to achieve the safety requirements to electric vehicles, which improve the reliability of electric vehicles and reduce the cost of maintenance.
Design of Power Windows Based on POWERLINK Industrial Ethernet
Authors: Lu Sheng Li , Li Min , Liu Mei Ling
Published: February 2014

This paper proposes a design of intelligent control system power windows based on POWERLINK bus by introducing features and advantages of POWERLINK bus technology. The system implements the real-time communication between each control unit and central controller through the POWERLINK bus, largely enhancing the coordination of window lift control, improving security features such as anti-pinch and has good scalability and portability.
Study on the Larger Bus Body Stability of Bend Steering
Authors: Jin Jie , Qin Fu Ming , Zhou Wei , Li Wen Liang
Published: February 2014

When a larger bus steering in the corners, it easily affected by the lateral acceleration so that the vehicle sideslips or rolls over, using the research methods of combining with real vehicle modeling and simulation to ensure the safety and comfort of the passengers. Analyzed and researched systems that affecting vehicles stability performance, including power train, steering system, brake system and the vehicles road model of the system curve .On this basis, compared to the acceleration values which the motorbus body can withstand in different states, proposing the acceleration values when human feel comfortable, uncomfortable and terrible, then conducted simulation tests under different turning radius and speeds. The results showed that: on the premise of ensuring the safety and comfort of vehicle passengers, the allowable speed limit with different bend radius is not the same; then it drew series of limit speeds allowed by series of bend radius, providing a reference and basis for future road construction and motorbus technical improvement.
Sports Biomechanical Research and Exploration on the Tennis Injuries
Authors: Hong Hui Hui , Han Liang
Published: February 2014

Tennis is very popular, but the incorrect action produces sports injuries. The knowledge of sports biomechanics is used in sports injury research on tennis. Two mainly classical research methods on tennis sports biomechanics are theoretical research and experimental study. This paper introduces the technical features of two research methods, theoretical research is mainly based on the model. The experimental study is mainly based on three systems of the kinematics, dynamics and biological measurement. The differences among them are compared in order to provide the overall ideas for study on sports injury of tennis.
A Study on Preparation Process Experiment of a Large Diameter Cylinder with High Precision
Authors: Zeng Hui Fan
Published: February 2014

A large diameter cylinder prepared by thick wall pipe as raw material presents the shortfalls such as high cost, difficulty in procurement, the increasing amount of labour and processing cost. This work proposed a large diameter cylinder with high precision. By conducting process experiments and compared with the preparing process of existing large diameter cylinder, the preparing process of the large diameter cylinder in this work is proved to be practical and economical.
The Summarize of High Power LED Headlamps Cooling Design of Automobile
Authors: Liu Chen Yang , Yin Mo , Cheng Xu Feng , Yin Guo Dong , Zheng Xiao Quan
Published: February 2014

With the luminous flux of highpower white LED has been further improved, LED will gradually replace incandescent lamp and halogen lamp, and become the fourth generation light source of automotive lighting. Now there are still a number of technical difficulties in LED application for automotive headlamp, one more difficult to overcome of which is the heat dissipation problem of LED headlamp. In this paper, the current LED headlamps heat dissipation solutions are introduced; and the future direction of improving the heat dissipation is given.
Preliminary Analysis on Precision Control of Reverse Retrofit Design of the Product
Authors: Fan Jun , Wang Lei Gang
Published: February 2014

The precision control is the key technology for reverse engineering. Focus on analyzing the reasons of the error of reverse retrofit design of the product, the factors, affecting the precision of the retrofit design of the product, through four stages which including product model, development & design, simulation, evaluation & acceptance, is proposed. By the example, through the distribution and control of precision rationally, the accuracy requirement of the reverse retrofit design of the product is met, effectively.
Design and Strength Analysis of the Wheelchair Switching Mechanism
Authors: Li Yu Wen , Wei Jian Kang , Zhang Jin
Published: February 2014

Based on studying the existing electric wheelchairs for disabled are not well adapted to a variety of road conditions, broken through the structure of traditional wheelchairs, a design proposal that can make electric wheelchair achieve the function of climbing stairs and walking was putted forward and a novel mechanism was designed. The mechanism can make the crawler chassis and the wheels of wheelchair switch when needed, and make the wheelchair travel freely and flexible on the ground or on the stairs. The finite element model of the mechanism was built, and the strength analysis was carried out. The strength analysis provide the theoretical basis for the prototype manufacture.
Design and Dynamic Deformation Analysis for Elastic Cutter Fixture of Tool Grasper Mechanism on Disc Type Tool Magazine with Double Loop Cutters
Authors: Jia Zhen Yuan , Zou Jun , Lu Xiao Hong , Ren Zong Jin
Published: February 2014

Double loop cutters arrangement can settle the contradiction between rotational inertia of the tool magazine and the dimension limitation of the cutter head effectively, and increase the store of tools. Disc type tool magazine with double loop cutters arrangement is designed and researched. The spring steel 65Mn is used to manufacture elastic cutter fixture as the holding device for its inner and outer loop tools. The dynamic deformation of elastic cutter fixture is discussed. The entire geometric movement process of elastic cutter fixture from being opened by the tool holder to accomplishing the whole action is analyzed. The effect and trend of inner stress caused by geometric deformation are studied. Furthermore, the force condition in each part of tool fixture can be calculated, thus predicting the motion stability and reliability of the elastic cutter fixture, and providing theory references for the design of elastic cutter fixture.
Research on the Influence of Hot Strip Shape to Ribbing Defect
Authors: Qiu Zeng Shuai , He An Rui , Chen Chao Chao , Peng Jun Ming , Tang Xiao Yong
Published: February 2014

Aim at solving the problem of ribbing defect is found on cold rolling strips which is caused by bad hot strip shape, analyze the reason from the hot rolling process, and study out that there are some reasons such as uneven wear of rolls can lead to ribbing defect. Roll contour, roll shifting model, rolling plan were optimized and got a geart effect: the hot strip shape being better, the production being more stable, the ratio of ribbing defect decreasing obviously (from 2.2% to 0.3%). The quality of their product has been improved a lot.
Design Calculation on Chain Conveyor of Material Storage and Transportation Box of Automatic Loading and Unloading Vehicle
Authors: Zhang Yi Jie , Shu Da Wen , Kong Ling Qiong
Published: February 2014

According to the design requirements of the chain conveyor of the material storage and transportation box of automatic loading and unloading vehicle, the 3D and mechanical models of chain conveyor were created. The strength of bearing square tube of chain conveyor was checked base on both models and the result shows that bearing square tube was strong enough and laid the foundation of following chassis structural design. The needed driving force and driving power of chain conveyor were obtained in working condition of full-load unloading transportation and rapid transportation by built calculation model and mechanical formula of the container material loading unit. The maximum driving force and driving power which are 63.25KN and 4.31KW appeared in working condition of full-load unloading transportation and the result provided important basis for the overall design of the automatic loading and unloading vehicle.
Finite Element Study of Ultrasonic Elliptical Vibration Turning of Ti6Al4V
Authors: Lu Dong , Cai Li Gang , Cheng Qiang
Published: February 2014

Ultrasonic elliptical vibration turning (UEVT) is an advanced machining technique for difficult-to-cut materials, in which with frequency in excess of 20 KHz is superimposed on the cutting tools movement. In order to analyze the effect of vibration frequency on cutting forces and cutting temperature, finite element models of ultrasonic elliptical vibration turning were developed. The cutting forces and the distribution of the temperature on workpiece and cutting tool were predicted. It is observed that the cutting forces and cutting temperature decrease with the increase of the vibration frequency.
Model Development for a Composite Core-Pulling Mechanism
Authors: Yin Yan Fang , Hu Hua Shun
Published: February 2014

The main purpose of this work was to develop a mathematical model and computer programs for design analysis in composite core-pulling mechanism. The injection mould with slanted guide pillar for two-step core-pulling from the side of the product effects significantly the quality and efficiency of plastic part. The study is a one-dimensional analysis of secondaryejector mechanism, based on a forward marching technique of solution for the simple structure and high safety and reliability. Using the simulation analysis of mechanical system based on Pro/E, the mechanism can solve the problem that plastic parts are difficult to side core pulling in different directions by the use of bevel pillar.
Research on Operational Reliability Index of Centrifugal Pump
Authors: Wang Wen Hong
Published: February 2014

the 65Y-100X2 type centrifugal pump is used as the research objective for analyzing the operating principle and structure, so as to improve the reliability of petrochemical pumps in domestic and reduce the distance with the same products in abroad. The reliability index analysis method is used to implement the analysis to the reliability of system, and the reliability of centrifugal pump is improved and the failure rate of system is reduced.
Mechanical Structure Design of the Full-Automatic Coil Strapping Machine
Authors: Zheng Yuan , Xu Bing , Liu Fu Li , Jiang Cheng Peng , Wang Han Bing
Published: February 2014

To develop a kind of automatic coil strapping machine is the object of this paper, which described the entire development process of the machine. This paper discussed some technical difficulties of the design, and presented the solution of the problems based on the existing technical conditions. For example, we solved the problem that how to pinpoint the right position for the different sizes of coils based on the geometric parameter optimization for swinging mechanism; and we solved the problem that the excessive pressing force of the friction wheel causes disruption of the steel strips traveling through the design of voltage switching circuit.
A Study on Brake Noise Using the Complex Modal Analysis Method
Authors: Tao Ye Ying , Su Zhuo Yu , Lu Sheng Bao
Published: February 2014

The paper analyzed the influence of the friction factor theoretically on the brake system to produce noise, through complex modal analysis method, established the finite element model of air disc brake to analyze and forecast the brake noise and get brake noises frequency on a certain test conditions. Through the analysis of multiple sets of brake noise under different friction coefficient, it is concluded that the increase of friction coefficient has a promoting effect on brake noise.
Study on the Positive EDM Based on the Field Emission Theory
Authors: Liu Shu Yang , Han Zhi Hong
Published: February 2014

With different processing parameters, both the machining efficiency and the wear rate of electrode materials are enhanced along with the increase of real discharging power and the valid discharging time. However, the increasing degree of wear rate is far lower than that of machining efficiency.
Test Analysis of the 60 Tons Converter
Authors: Yin Qiang , Li Gong Fa
Published: February 2014

Converter is the main equipment in steel making, and its work reliability decides the security and economy of steel production. Therefore, how to design and test analysis of converter has been an important subject of industry research. Through the static centric calculation of converter, combining independent software, compute dynamic center and dynamic torque of mass in the process of sampling and the tapping of converter. The reliable operation of converter through qualitative analysis are guaranteed by taking necessary measures.
The Research of Fuel Pressure Fluctuations within Diesel Injection Pump Cavity on Cam Shaft Rotate Speed
Authors: Liang Chao , Chu Ya Xu , Zhang Jian
Published: February 2014

Fuel pressure fluctuations in a diesel injection pump cavity can affect the injection quantity balance. Among them, the injection pump rotational speed is a major factor affecting fuel pump fuel pressure fluctuations within the cavity. This article through the use of HYDSIM software for different speeds of volatility in fuel injection pump cavity pressures for Simulation.
Dynamic Propagation Problems of Symmetrical Mode III Crack
Authors: Ji Jin Li , Chen Jing , Shi Chen , Hao Guo Dong
Published: February 2014

By the measures of the theory of complex variable functions, dynamic propagation problems of symmetrical mode III crack were researched. The problems considered can be very facilely translated into Riemann-Hilbert problem by means of self-similar functions, and the analytical solutions of the stress, the displacement and dynamic stress intensity factor under the conditions of motive variational loads Px/t and Pt3/x2 which were applied the surfaces of mode III crack, respectively, were acquired.
The Study on 5-DOF CNC Machine Tool Motion
Authors: Wei Jia Zheng
Published: February 2014

The 5-DOF CNC machine tools motion error, motion space simulation and interference are analyzed. The tool machine dynamic and static interference, trajectory planning are discussed, which realizes the parts manufacturability and processing rationality.
The Strain Analysis at the Broadening Stage of the Hollow Railway Axle by Multi-Wedge Cross Wedge Rolling
Authors: Hu Bin , Shu Xue Dao , Yu Peng Hui , Peng Wen Fei
Published: February 2014

The paper is based on the newest hollow railway axle, which utilizes the Pro/E designed multi-wedge cross wedge rolling (MCWR) model, utilizes the finite element analysis software DEFORM-3D to complete the numerical simulation about the whole stage of the hollow railway axle forming process, and analyzes the strain rule at the broadening stage of the hollow railway axle, especially conducts a detailed research on forming character into the strain rule at the multi-wedge transition stage, and finally gets the strain forming mechanism of the hollow railway axle at the broadening stage. The result of the research on the strain rule poses great scientific significance on enhancing the product quality and the production efficiency of the hollow railway axle, and improving the theory of multi-wedge cross wedge rolling.
Research on Process Parameter Optimization of the High-Neck Flange Closed Rolling Based on the Orthogonal Experimental Design
Authors: Sun Bao Shou , Hong Zhe , Xu Long Qing , Shu Xue Dao , Gu Bo Qin , Huang Xiao Diao
Published: February 2014

This paper simulates the process of the high-neck flange closed rolling on DEFORM-3D and optimizes the rolling process parameter by analyzing the results based on the orthogonal experimental design. For the high-neck flange, the results show that the effects on ellipticity are in the order of the mandrel feed speed, the main roll rotational speed and initial blank temperature. The former two factors show the significance while the initial blank temperature does not show that.
Analysis of Chair’s Materials and the Wooden Chair Manufacturing Process
Authors: Zhong Zhen Ya , Sun De Lin
Published: February 2014

Starting from the material to classify chairs and their manufacturing process, and focus on analysis of the production process of wooden chairs, main processes points and equipment.
The Development of Tribology
Authors: Cheng Zheng Yong , Zhang Sheng , Gu Wen Juan , He Bang Gui , Li Ying
Published: February 2014

In the past 20 years, with the rapid development of nanotechnology and increasing people's social needs, tribology gained the rapid development. Meanwhile, many new areas produced. This article describes a simple spherical roller bearing down tribology design. Thus the development of tribology and trends are explained.
An FTPBM Model for Conceptual Design of Mechanical Execution System
Authors: Chen Zheng Shui , Deng Yi Min , Li Shan , Yu Yuan Wen
Published: February 2014

Mechanical execution system is an important part of mechanical system that contributes to the delivery of system function. There is currently no conceptual design model that is specifically for the conceptual design of mechanical execution system. Based on the FBS (Function-Behavior-Structure) model, this paper investigates the characteristics of the conceptual design process of mechanical execution system, and subsequently proposed an FTPBM (Function-Technology-Process action-Motion behavior-Mechanism) model for its conceptual design. The model includes a functional prototype and six steps of design procedure as well as a number of design synthesis strategies and methods. A design case of press machine is also studied, which demonstrates the proposed model to be not only practicable, but also improve the designers innovation capability.
Numerical Simulation in the Effect of Ignition Mode and Position on Fragment Velocity of Azimuthal Warhead
Authors: Zhu Xu Qiang , Song Cheng Jun , Cheng Yi
Published: February 2014

To study the effect of ignition mode and position on fragment velocity of azimuthal warhead, a simulation model was established and computed. Simulation analysis results of azimuthal warhead showed that two ignition points mode was more valuable than the three ignition points mode, the fragment velocity curve had increasing trend in 0°~180° radial direction, ignition positions near to the edge of main charge end had the highest performance-cost ratio in the practical application.
Research on Thermal Protection Performances of Metallic Honeycomb Panel Subjected to High-Speed Thermal Shock
Authors: Wu Da Fang , Zhou An Feng , Pan Bing , Wang Yue Wu , Pu Ying
Published: February 2014

In this paper, by using a self-developed transient aerodynamic thermal simulation system, the thermal protection performances of metallic honeycomb panel were tested at different transient heating rates, with a maximum instantaneous temperature reaching 950°C. Furthermore, a three-dimensional finite element model was established to determine the thermal protection performances of the metallic honeycomb panel in different simulation environments with high heating rates. The fact that the numerical calculations agreed well with the experimental results is a good foundation for replacing certain expensive thermal experiments with numerical calculations. The results of this research provided important reference values for the design of the thermal protection system comprising metallic honeycomb panel structures.
Diffusion Wear of PCBN Tool when Cutting Materials Difficult-to-Cut Based on Thermodynamics
Authors: Shao Fang , Wang Yu Ting , Zou Li Jing , Wu Yan Ying , Chuan He
Published: February 2014

Cutting temperature always highly reaches over to 1000°C when high speed machining with PCBN tools. Diffusion of tool material element may have important influence on tool wear at such high temperature, the diffusion wear and oxidation wear have become the major wear mechanism. In this paper, the rules of diffusion wear and oxidation wear for PCBN cutting tools are proposed and analyzed based on thermodynamics theory. Dissolution concentrations in typical normal workpice materials of PCBN tool material at different temperature are then calculated. Diffusion reaction rules in high temperature are developed and analyzed using Gibbs free energy criterion. The machining tests were conducted using the PCBN tools at different cutting speeds of 50, 95,100 and 180 m/min, feed of 0.1, 0.2 and depth of cut of 0.1, 0.8, 1, and 1.5 mm respectively on PUMA300LM numerically-controlled lathe. It was found that the theoretical results were uniform with the experimental data; the results will provide useful references for tool material design and selection.
Thermo-Mechanical Coupling Analysis of Tubular C/C-Weaving Composite
Authors: Qu Feng , Qu Dong Po
Published: February 2014

For the tubular C/C-weaving composite is often loaded on thermotics and mechanics loads together in using, adopting the sequential coupling method, utilizing the finite element analysis software: firstly analyze the stress distribution on loading temperature and pressure loads together, the maximums and changing rules of displacement, stress and strain have been obtained. Based on the works above, further to analyze the thermo-mechanical coupling of different loads, the curves of displacement, stress and strain in the specified paths have been obtained, it shows that the influence from temperature on every parameters is little when loading on the larger loads. So come to the conclusion that the tubular C/C composite has good temperature stability and can be used in the condition of high temperature or temperature changes greatly.
Research on Advanced Manufacturing Technology in Product Modeling Design
Authors: Liu Yu Hong
Published: February 2014

The advanced manufacturing technology is developing rapidly and it has gained more and more attention from manufacturing industry and other related fields. It has permeated into every subjects and majors by its characteristics of progressiveness, universality, practicability and integration, and has played an immeasurable role in promoting the development of industry product modeling design. This paper discusses and analyzes concretely the application of advanced manufacturing technology in product modeling design from some aspects such as advanced manufacturing technology, computer aided design, rapid prototyping technology and virtual manufacturing technology.
Research on Mechanical Deformation of Thrust Bearing
Authors: Li Yong Hai , Wang Jian , Yao Rong Kui , Liu Shi Bo , Yang Jia , Gao Yan , Yang Ning
Published: February 2014

Finite Element Method numerical simulation has been carried out to analyze mechanical deformation of thrust bearing under the point and line supporting condition. The simulation results indicate that the torsion deformation of the point supporting is the larger, torsion deformation is mainly radial bending deformation, and circumferential bending deformation is small, it becomes more and more obvious with the decrease of bearing pad length-width ratio under the same working conditions for the same pad. Line supporting torsion deformation is mainly the circumferential bending deformation, and the left and right sides are symmetrical along the circumferential, the radial bending deformation is small, torsion deformation related to the length and width of supporting, with their size increasing the torsion deformation decreased.
Study on Finite Element Model for Splitting Capacity of Bamboo Culms
Authors: Zhao Zhang Rong , Fu Wan Si , Zhou Jian Bo , Han Wang
Published: February 2014

For the problem of bamboo structure safety caused by bamboo culms splitting, the bamboo culms splitting capacity test method is studied, bamboo culms splitting capacity finite element model based on brittle fracture mechanics is proposed in the work. The results calculated by FEM are consistent with the experimental results, and the error is in 20% or less. The bamboo culms splitting capacity finite element model established above can provide supports for bamboo culms wide engineering applications. The developed model has theory and engineering significance for digital bamboo building optimal design.