bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Grid Connected Parallel Inverters with Interleaved Phase Shift by Using CAN Bus
Authors: Chen Jyh Wei , Lin Huan Fu
Published: November 2012

A grid-connected parallel inverter with interleaved phase shift is proposed in this paper. The synchronous are generated by the master module to achieve interleaving phase shift PWM for the parallel inverters connected to grid-tied system that make the inverter to output current to the power line and share the load. TI TMS320F2812 DSP is used for system feedback control with voltage and current by using A/D converters to generate the output current close to sine wave. The expected output current values are determined by the master module and transmitted via CAN (Control area network) between inverter modules. The grid-tied system uses zero-voltage-detection circuit to synchronize the inverter currents with grid voltage. For each switching period, PWM voltage of two inverters are interleaved to reduce the total output current ripple so that the switching frequency can be reduced and the power system EMI problem can be alleviated as well. The experiment results are provided to verify the performance of the proposed system to reduce output current harmonic distortion.
Interface Design Based on Task Model of Tower Crane Security Monitoring and Management System
Authors: Qu Zhen Bo , Tian Yun , Song Ying
Published: November 2012

The user model is the basis of the interface design, and it is also the important standards of judging interface design. Tower crane user's task model is built based on tower crane safety management system and product man-machine interface in this paper. It is summed up that the design process of the tower crane safety management system man-machine interface according to the modeling. These theories and methods are considered and applied in the design of the tower crane safety management system man-machine interface. The interface become simple and easy to use, and it is also efficient during the work of the tower crane.
The Switch Control of Double-Power Supply System Based on Intelligent Static Switch
Authors: Qin Juan Ying , Liu Cui Fang , Bi Chang Qing
Published: November 2012

This article introduces the principle of achieving high precision switch control on double-power supply system of electric fence power & inverting power by intelligent static switch with DSP-TMS320LF2407A as the main control chip and its hardware & software characteristics. The most central part of intelligent static switch is to embed an intelligent soft management system and set up a platform to manage other software, which achieve fast data processing and complex Boolean calculation of system. The intelligent static switch can monitor the magnitude, phase and frequency of electric fence power & inverting power in real time according to present parameter, revise the frequency & phase of standby power in-phase signal which is in a warm-waiting state, make sure they are highly precise in double-power supply system, and achieve “seamless” switch.
An Introduction to Cloud Design
Authors: Lu Ji Xiang , Lu Chang De , Wang Ping
Published: November 2012

The world is changing and the science and technology are making progress. Internet of Things is raging like a storm, and cloud manufacture is an invisible net preventing all escape. Changing the world, when conditions are ripe, success will come, which calls forth the idea of cloud design. This paper discusses the concept and theory of cloud design, which is a design framework empowered by advanced technologies including cloud computing. Cloud design is a modern design concept and methodology, and is the future of modern industrial design. The science and technology foundation of cloud design includes design, cloud manufacturing, internet of things, cloud computing, computer aided industrial design (CAID) , engineering, aesthetics, psychology, ergonomics, ontology and philosophy. The service system of cloud design consists of service, operational platform and resource. Its key technologies concern resource deployment, service management, resource provider/user management, and security. This paper also outlines the procedure and preliminary conclusion of the application of cloud design, gives direction and lays foundation for the follow-up research and development. As cloud design is new, this paper tries motivate researchers to come forward and contribute in various ways.
Direct Torque Control of Brushless DC Motor
Authors: Wu Long , Ling Liu Yi , Chen Shuai
Published: November 2012

Due to the good performance of brushless motor, its application is widespread. Brushless DC motor has following advantages that are low interference, low noise, high efficiency and so on, so it was widely used in industrial and control field. But DC motor has larger current commutation torque ripple, greatly reduce their reliability and stability. This design using direct torque control strategy to reduce torque ripple, and compares the control results of PI controller with direct torque control method. In the process of regulating motor’s speed ，When adopts PI controller here has great overshoot and start time of speed is long than direct torque control, current pulse obviously severe than direct torque control. The simulation results show that overall effect of direct torque control is superior than double closed loop control. It fully explains that the control strategy in this paper is effective.
Application of TMS320LF2407A and CAN Bus Technology in Flow Control of Inverter
Authors: Liu Cui Fang , Qin Juan Ying , Qin Xing
Published: November 2012

As parallel operation of several single inverter modules, the alternating voltage outputted by the single inverter module should guarantee same frequency, same phase and equiamplitude. Otherwise, circumfluence will be caused in the single inverter module. The circumfluence not ecreases output capacity of the system but destroy the inverter in serious condition. So, restraint circulation is the key technology of inverter modules in parallel control. Based on the analysis of inverter modules in parallel control, this paper designs the parallel current sharing system of multi-inverter modules with TMS320LF2407A as the main hip, adopts the control strategy of “direct current sharing”, and achieves the data communication in multi-modules allel connection as well as the effects of multi-inverter odules in parallel current sharing control with CAN controller embedded in TMS320LF2407A.
Based on Single Chip Microcomputer Heating Temperature Automatic Control System
Authors: Liu De Yong , Song Hong , Kong Zhi Qiang
Published: November 2012

The temperature control is one of the most common control system,with the development of the sensing technology, new single-bus digital temperature sensor to achieve faster development of the test and control of the temperature. The system is a temperature sensor AD590 to acquisition analog signals, after ADC0809 converted into digital signals to 89C51 single chip processing, so as to achieve the collection of temperature, and then through the CD4511 drive seven sections LED display. The system can control of temperature, through the keyboard for temperature of add or subtract Settings, if detection temperature is more than set temperature, stop heating, if detection temperature is below the set temperature, start heating. The system of design and wiring are simple,easy extension, cost-effective, volume is small, compact structure,strong anti-interference ability.
An Intelligent Bullet Counter Based on UV Electro-Optical Technology
Authors: Ma Li Xiang , Li Zheng
Published: November 2012

Intelligent management of bullets at shooting ranges suffers from the limitations of manual bullet counting. Based on UV electro-optical technology, we have built a bullet counter and participated in field experiments. The bullet counter is composed of two modules, UV electro-optical module and data processing and communication module. In UV electro-optical module, a ‘solar blind’ UV detector is used to detect UV radiation of bullet flames. The embedded preamplifier of UV detector and the low-pass filter increase the signal-to-noise ratio of the system greatly. In data processing and communication module, analog signal, containing bullet impulses, is converted to digital signal and counted by a timer. The results of bullet counting can be read by USB. All these functions are implemented by STM32 (STM32F103CBT6), a microcontroller based on Cortex-M3. The bullet counter has been put into use at several shooting ranges and worked well.
Study on Navigation of Wireless Sensor Network Mobile Robot
Authors: Zhao Cang Rong , Zheng Miao Miao
Published: November 2012

For optimal design of mobile robot path planning problem, an improved artificial potential field control method is designed. Using infrared sensors and ultrasonic sensors to detect the surrounding environment will get the information of obstacles and goals. Proposed an adaptive real-time localization algorithm based on improved DV-Hop algorithm to realize real-time localization for wireless sensor network mobile robot. The improved artificial potential field adopted the improved potential function that ensured the goal is the global minimum so the mobile robot can reach the goal freely. The effectiveness and feasibility of the improved algorithm verified by simulation.
Design of Human-Simulation Intelligent PID Based on APMP Refiner Control
Authors: Tang Wei , Cheng Hao
Published: November 2012

Aiming at resolving the large difficulty of gap adjustment in APMP (Alkaline Peroxide Mechanical Pulp) refiner, and it is difficult to reach the production requirement by using traditional PID controller, an improved PID controller (human-simulation intelligent PID controller) is proposed through combining the conventional PID controller and human-simulation controller. And it has been used in APMP refiner control, and the simulation results and practical application results show that this method is feasible and accurate.
The Optimization of Mechanical and Electrical Integration Linear Output Transmission System with Sensor Function
Authors: Liu Yu Wang , Leng Yu Quan , Luo Hai Tao , Zhou Wei Jia
Published: November 2012

The new highly integrated mechanical and electrical integration linear output sensor system designed is used to solve the problems of movement conversion/transmission, force transmission/ measurement etc. Firstly, further theory study is presented and the function of sensing parameters and transmission parameters is deduced; Secondly, the key parameters of system design and the constrained conditions are shown based on the system structure and strength theory. At last through simulation to determine the optimal structure parameters meeting the specific conditions and establish the corresponding relationship of parameters for future design.
Test Analysis of a Six-Wheel Hydraulic Active Suspension Control System
Authors: Chen Wei , Yao Zhi , Zhao Qing Bo , Wang Tong Jian
Published: November 2012

In order to make the active hydraulic suspension system to adaptive the ground. Taking the asymmetric valve controlled hydraulic cylinder as actuators, a six wheels hydraulic active suspension was designed. It is difficult to analysis of the six wheels system. So this paper established the single wheel’s mathematical model to instead analysis of the whole system, designed QFT (Quantitative Feedback Theory) controller which can be a solution to the system robustness, researched the hydraulic active suspension system. The results show that it is good for tracking performance of the hydraulic cylinder which taking the asymmetric valve controlled as actuators, system responses timely and the controller can meet the controlling requirements. This hydraulic active suspension system can improve off-road performance of engineering vehicles.
A Study on Servo System of Radar Tracking Fast Targets
Authors: Zhang Xi Ping , Guo Min , Lei Lu
Published: November 2012

Reviewed the study of control method about radar servo in recent years, The most important thing is the non-linear improvement of the classical PID , including PID and fuzzy control combined; direct function method to construct NPID control; otherwise a weather radar servo system using the Bang-Bang control. On the basis of modern control theory, the new control strategy used in radar servo system is introduced to replay the new threat air defense in modern warfare; Establishing the state equations of the system and building state observer is to achieve the state feedback ; Utilizing the principle of optimality, fast and accurate indicators of the system converted to solve the optimized u in the state equation is to meet a new generation of high-quality performance of radar servo system.
Development of Automatic Tracking Plasma Spray Welding System of Triple Eccentric Butterfly Valve
Authors: Jiao Lei , Wang Yan , Zhang Zhong Zhong , Wu Yue , Wang Xiao Lu
Published: November 2012

Herein we design and describe an automatic tracking of three eccentric butterfly valve plasma spraying system and a complete spray welding technology. Two IGBT welding inverters are introduced as the power of both the main arc and pilot arc of the plasma spray welding in the main circuit.Dual-Computer communication control System is adopted in the control circuit of the system: the Programmable Controller（PLC）is employed to control the plasma spray welding process and the single-chip microcomputer 80C196KC is to control the trace and calculating. The tracing performance test and the welding results show that the system is well-designed, steady and reliable, and considering its good welding conditions, we conclude that it can meet the technical requirements of Tri-eccentric butterfly valve surface spray welding and can keep up with the development tendency of automatic tracking of plasma spray welding system.
Numerical Simulation of Pulsating Flow over Blood Vessel Robot
Authors: Huang Chun Yan , Jiang Fan
Published: November 2012

In order to study the influence of pulsating blood flow to robot and blood vessel, UDF programming of the inlet velocity is defined as the boundary condition, and the model simulate the turbulent blood flow. Moreover, in this situation, this paper analyzes the influence caused by blood parameters for the biggest surface pressure on robot. The results are showed that the variation of pressure and velocity is different on different position at 0.08s and 0.27s, and the surface pressure of the robot become greater by the increase of blood density or viscosity.
The Design and Implementation of Spacecraft Co-Simulation Platform
Authors: Yin Hang , Gao Yong Ming , Wang Chao , Li Xin Xing
Published: November 2012

With the continuous improvement of complexity in the space simulation system and the enhancement of multi-technology integration, the co-simulation technology is an important way to solve complex simulation problems in the big system. After analysis of relative theories and main methods of co-simulation, collaboration data interfaces among multiple software are improved and matched with a number of simulation software system. The co-simulation framework is designed and a set of spacecraft dynamics co-simulation analysis system is established on the frame of HLA / RTI and on the principle of co-simulation technology. The key task on orbit service of the spacecraft is modeled and simulated. The software can complete the work that a single simulation software could not be done and achieve good results.
Design Scheme of Outside Environmental Monitoring System for Coal Mine Mobile Refuge Chamber
Authors: Zhang Bin Hui , Zhang An Ning , Yin Zhong Hui , Gu Yu Ming , Jing Zi Long
Published: November 2012

The paper mainly introduced research state of coal mine mobile refuge chamber and its outside environmental monitoring system, analyzed particularity of chamber-outside environment and design requirements of outside environmental monitoring system for coal mine mobile refuge chamber, and put forward design goals and idea of software design, hardware design and protective device of outside environmental monitoring system for coal mine mobile refuge chamber. It put forward a design scheme of outside environmental monitoring system for coal mine mobile refuge chamber according to the actual applications and design goals. The design scheme consists of software, hardware and protective device. And it detailed expounded environmental monitoring system’s working principle, signal transmission principle and workflow. The paper can provide technology reference for development of outside environmental monitoring system for coal mine mobile refuge chamber in China.
The Application of Coal Cleaning Detection System Based on Matlab Image Processing
Authors: Dong Ji Xian , Mu Qian
Published: November 2012

This paper discusses the application of image processing methods in the Coal preparation detection system. The system uses a light source to illuminate the coal and coal gangue, and then captures images with a CCD camera. After that, those images are sent to analyze in the image processing module. The control system sets the jet valve to exclude gangue. For the image processing, the sample images are performed with the help of Matlab, by using the module of preprocessing, image segmentation and feature selection. After analyzing the grayscale histogram of the coal and gangue, the distinction between coal and coal gangue gray threshold are obtained. Finally, the control system compares the gray value and threshold to distinguish coal and gangue, and then excludes gangue to the transportation crawler.
A Ship GPS/DR Integrated Navigation System
Authors: Zhang Yuan Liang
Published: November 2012

The development of the global economy stimulates the exploitation of the ocean. A precise and stable ship navigation system is very important for people to explore the ocean. Dead reckoning (DR) system is a frequently used navigation system for sailing in the ocean. It can provide precise short term navigation information but the error of DR system can accumulate over time without limitation. GPS can be used for localization and navigation in outside environment. Although the SA policy was removed the accuracy of GPS for civilian use is still big. But the errors of GPS are bounded. Since the complementarity of DR and GPS system the integrated GPS/DR system can provide good navigation results. In this paper a new Kalman filter based DR/GPS data fusion method is proposed. This method is designed based on the characteristic of the GPS receiver. By using this data fusion method the cheap GPS receiver can cooperate with DR system to provide precise navigation information for ships. Simulation is conducted to validate the proposed fusion method. The good result shows the potential of this fusion method for the ship navigation.
Image Edge Detection Based on Multi-Structure Elements and Nonsubsambled Contourlet Transform
Authors: He Kun Xian , Wang Qing , He Fan
Published: November 2012

This paper presents a fusion algorithm for image edge detection based on the mathematical morphology and the NSCT. First the de-noised image is processed by the multi-structure elements of the mathematical morphology. And then the processed image is decomposed by the NSCT into multi-scale and multi-directional sub-bands. Edges in the high-frequency sub-bands are extracted with the dual-threshold modulus maxima method. Finally the edges of the de-noised image are refined into a single pixel edge image. The simulation results show that this method can effectively suppress noise, eliminate pseudo-edges, locate accurately and detect the complete outline.
Research on Independent Coarse Alignment of Aircraft Carriers SINS
Authors: Yuan Tao , Xu Jing Shuo , Di Ya Zhou
Published: November 2012

Carrier-based Aircraft closely watched as the aircraft carrier weapons, storms and other factors affect the generated carrier swing to sway.This will enable the gyro measurement to the Earth's rotation angular velocity signal to noise ratio dropped significantly, giving the aircraft carrier's initialaligned to bring difficulties. To solve this problem, the Earth gravity acceleration in the inertial space the SINS independent coarse alignment, and gives the process of acceleration due to gravity points vector of analytic coarse alignment and fine alignment algorithm. Theoretical analysis and simulation results show that the moving base SINS alignment method can effectively solve the initial alignment of the aircraft carrier in the state of the ship mooring.
WI-FI in Mine Ventilation Monitoring System
Authors: Cao Xu Hui , Lu Cai Wu , Li Yu Ji
Published: November 2012

WI-FI is currently a popular wireless LAN technology, with access to high speed, large coverage area and so on. WI-FI has its flexibility and mobility, more and more attention, showing great prospects. This article describes the characteristics and advantages of WI-FI technology, combined with the actual situation of a WI-FI based wireless sensor technology and monitoring system for the implementation of the mine ventilation plan, and the program specific application in the monitoring system has been described, the program has proved flexible, simple wiring, has certain application value.
Study on High-Grade CNC Machine Tool Wear Monitoring Methods and Experimental System
Authors: Huang Min , Liu Xiu Li , Yan Le
Published: November 2012

Today, CNC machine tools are moving in the high-speed, high precision, heavy and complex processing of direction, leading to early failure in service due to machine performance, if not timely diagnosis and early warning, will result in waste increases, fluctuations in the quality, productivity decline.Therefore, to ensure reliable operation of CNC machine tools is very important.To build fault diagnosis of CNC machine tools and get test method as the goal, the tool wear experiments are carried out. Signals for cutting tool with different wear in milling process are detected，acquisited and analyzed through vibration sensors and acoustic emission sensors on the milling tools. To LabVIEW8.6 as development platform, a fault diagnosis experimental system of CNC machine tools is developed, including data acquisition module, signal analysis module, fault diagnosis module.
Research on Substation Transformer Monitoring System with GSM Network
Authors: Zhu Xiao Long
Published: November 2012

In recent years, GSM communication network has developed rapidly, which has basically covered the whole country and has been improved the quality of network communication. The public communication network transmission is used GSM power equipment information, which is a power of new communication system and the distributed power equipment monitoring to achieve the new ideas. This article is based on the research and the practice, and it puts forward and develops the practical GSM network based on the master station software of distribution transformer monitoring. It is used to implement the data transmission between the serial port and the database. The module provides a common library interface to other programs that can be called directly. Distribution transformer monitoring is the main part of the master station software to develop and use the Power Builder. PowerBuilder native database is used the local relational database SQL Anywhere and the GSM distribution transformer monitoring system of the master station software is used the standard Windows interface style and modular design. The system can be used as an important part of power management, and the urban distribution network automation is also a useful addition to favorable scheduling and allocation of a reasonable load, which has the good social and economic benefit.
Design and System Realization of Real-Time Monitoring of High Voltage Lines
Authors: Hu Deng Gao , Zhao Hong Qiang , Luo Cong Wen
Published: November 2012

The real-time monitoring of electrical parameters which be used for weighing high voltage lines, such as voltage, current, power, power factor and so on, is the important base of realization of assuring reliable and efficient high voltage surge. According to actual electricity utilization demand of high voltage substation, the real-time monitoring system of high voltage lines designed and realized on the basis of using programming language c#. In the meantime introduces the key feature of system.
Mechanical Structure Design of Vacuum Holder Disk Head Cleaning Machine
Authors: Li Dong Wei , Feng Qiang
Published: November 2012

In the production process of disk head on the computer hard disk, although the strict control have been progressing on the environment and the working procedure by production factory, it’s still difficult to make cleanliness of the products reach the requirement of hard drive assembly. Because the working procedure is complex, the pollution source is broader, and the cleanliness standard has been raised to the " without any particle under the 200 times magnifying glass ", which is to meet the increase of the hard disk capacity. This paper designed the mechanical structure of a new machine for cleaning disk head. It uses vacuum to hold disk head instead of grid, and combines spray cleaning, scrub, scouring, ultrasonic cleaning, drying, with electromagnetic valve to control vacuum degree in the vacuum tubes and fixture. Thus this machine cleans disk head to improve its cleanliness.
Development of Quantitative Analytical Instrument for Colloidal Gold Strips
Authors: Wang Yang , Jiang Kai , Wang Ping
Published: November 2012

A novel analytical instrument for quantitative testing colloidal gold strips is developed based on the principle of photoelectric detection. The test-strip analytical instrument uses green LEDs as the emitting light source and a photodiode as the receiving device for obtaining reflected light, and utilizes a step motor to drive detection system for scanning the examining areas. Modulation technique for light source signals and demodulation technique for receipt signals are used to eliminate the interference of the background noise. The test results indicate the system has high detection veracity rates with detecting errors less than 1%, and good detection stability with coefficient variables less than 2%.
Software Development for Testing and Evaluating Online Dynamic Performance of CNC Machine Tool
Authors: Wang Jun Qiang , He Yi , Niu Wen Tie , Liu Zhi Hong
Published: November 2012

On the basis of test and evaluation theory, the software was developed to evaluate the online dynamic performance of CNC machine tool. After the standard test program was run, the response data was obtained through data collection system. Then the dynamic performance of CNC machine tool was fast appraised. Finally, all of test data and evaluation results were stored into database. It provided a good foundation for understanding the real-time status and variation rule of CNC machine tool.
FLUENT/SIMULINK Collaborative Simulation for Missile Separation from Cavity
Authors: Han Tong , Tang Shang Qin , Huang Chang Qiang , Dong Kang Sheng
Published: November 2012

In order to solve the dynamics and kinematics highly coupled problem which exists in missile separating from cavity and in order to acquire accurate trajectory parameters and import control system, a parallel collaborative simulation platform was established. The data interface between FLUENT and SIMULINK was developed by the way of share data file, which use the Journal file of FLUENT and S-function of SIMULINK. The missile’s rudder control model was established. The aerodynamics characters and trajectory characters during missile separating from cavity were simulated under uncontrolled and closed-loop controlled conditions. The simulation results verify the feasibility of parallel collaborative simulation and show that rudder control method can effectively improve the characteristics of missile separating from cavity.
Application of Value Engineering in Industrial Product Design
Authors: Duan Wen Xin
Published: November 2012

High-value products is the goal what to go after for consumer and the designer of industrial product must have a sense of value first. Value engineering is a creative activity which increase product value by optimizing the relationship between the function of product and its’ cost. It is a very effective way that the idea and methods of the value engineering are engaged in the product design, that is a effective measures for improving product value and its innovation design. The core of industrial product design is to carry out the functional and cost analysis of the product design in engineering activities.
Simulation Study of Vehicle Brake Stability Control on Turning Lane Based on ABS
Authors: Yang Tao , Song Dan Dan
Published: November 2012

Vehicle under braking in turn condition can easily cause lateral instability because of the centrifugal force. In this paper, the defects of ABS control methods of the vehicle under braking in turn condition were analyzed, a braking force control strategy by the integrated control of ABS and yaw moment control for vehicle cornering is presented. Based on ABS, a yaw moment controller using fuzzy control theory is designed, by controlling yaw moment of vehicle and regulating slip rate of wheels, the dynamic regulation of yaw moment in vehicle braking is realized, therefore, vehicle braking stability on turning lane is improved. A simulation is performed with it during two different conditions: step input and sinusoidal input, the results showed that the transient and steady response based on presented method is better than that of ABS only, and the presented method can effectively control the yaw rate and side slip angle synchronously, achieve good transient and steady response, lighten the burden of the driver and improve vehicle yaw stability.
Vibration Analysis of a Shell Structure by Finite Element Method
Authors: Zhao Ming Hui
Published: November 2012

Plate-shell structures, especially cylindrical shells and spherical shells, are widely used in engineering fields, such as aircraft and tanks, missiles, submarines, ships, hydraulic pumps, infusion pipelines and gas pipelines, and so on. These structures are usually in a fluid medium, which are related to the structure fluid-solid coupling and acoustic radiation field. As many experiments show that enclosed air in a thin walled structure, just like the violin, affects some modes of vibration significantly, air coupling between vibrating sides of the structure cannot be neglected. In order to explore the sound pressure distribution of vibrational frequencies, this paper, considering the material anisotropy, analyzes a typical complex shell structure of the violin by finite element method, including acoustic-structure coupling analysis and post-processing, especially sound pressure vibration frequency extraction. Finally, we get the conclusion that the distribution of sound pressure vibration frequency is similar to the normal distribution.
Numerical Computation of Acoustic Field Using Boundary Mesh Less Method
Authors: Hu Hai , Wu Xin Yue , Ma Long
Published: November 2012

The common requests of the meshless interpolating functions are researched, and its construction method and procedures using the moving least squares method are introduced. The point collocation method is adopted to discretize the Kirchhoff-Helmholtz boundary integral equations into equation groups that constrained by boundary conditions. Constrained equation groups are solved by matrix-division method finally. Therefore, the discrete numeric expression of acoustic radiating and transferring model is obtained. In the example, acoustic field is calculated by the acoustic radiating and transferring model that obtained through both BMLM and BEM, and the results are contrasted between the computational values and the true values. It shows that the interpolating functions of BMLM could be built more flexible. So the accuracy of interpolation and calculation by BMLM is higher.
Research on Operation Stability Deterioration Trend Prediction Faced to Wind Power Group
Authors: Jiang Zhang Lei , Xu Xiao Li , Zuo Yun Bo , Zhang Zhi Jun
Published: November 2012

A operation stability prediction model faced to wind power equipment group based on Internet of Things(IOT) is research. It’s beneficial to improve the operation stability of key equipment group and promote the emerging IOT technology application in equipment maintenance. The prediction model mainly including: based on IOT constructing the system of remote online sample acquisition and operation stability prediction; proposing operation trend prediction algorithm based on energy decoupling faced to wind power rotating machinery, realizing of operation trend feature extraction of equipment group; constructing operation stability trend prediction model faced to equipment group. Operation trend feature is used to predict fault trend of wind power in order to ensure safe and stable operation of wind power group.
Application of Support Vector Machine Regression in Failure Analysis of Fan Pump in Amphibious Assault Vehicles
Authors: Lin Min , Chen Jian Hua , Yi Liang Hai , Li Jun
Published: November 2012

Hydraulic motor is one of the elements with a high occurrence rate of failure in hydraulic system of amphibious assault vehicles. When the fan pump leakage reaches the limit value allowed, the fan pump should be renewed or overhauled. Through an analysis of the influencing factors that affect fan pump leakage of amphibious assault vehicles, this article establishes a support vector machine (SVM) regression model for fan pump leakage and gets a maximum relative error of 4% between the fitted value and the measured value of fan pump, which offers more reliable evidence for scientific determination of renewal period or overhaul period of fan pump.
Fault Diagnosis of Induction Motor Based on Wavelet Packet Analysis and Negative Selection Algorithm
Authors: Yuan Gui Li , Qin Shi Wei
Published: November 2012

For the spectrum characteristics of the motor vibration, the vibration fault diagnosis method of motor rotor rubbing based on wavelet packet transform and real-valued negative selection algorithm is put forward. Using wavelet packet analysis to energy analysis of rotor rubbing and extracting the fault feature vectors, then by real-valued negative selection algorithm to identify the normal and failure mode eigenvectors. The experimental results show that with this method all the rotor rubbing faults can be detected comprehensive and rapidly. This method has high feasibility of the wavelet packet analysis and real-valued negative selection algorithm in the rotor rubbing fault diagnosis.
The Transient Characteristerics Evaluation of Dynamic Environmental Test of Satellite
Authors: Zhu Jian Bin , Xiang Shu Hong , Feng Yao Qi , Fan Shi Chao
Published: November 2012

The dynamic environmental test of spacecraft products plays an important role to guarantee the reliability. Dynamic environment of spacecraft mainly generated in the launch phase, has short effect time, so the transient characteristics of spacecraft products are very important. In this paper, the dynamic test purposes of different developed stages (mainly include structural model phase and flight model phase)are sorted out, evaluation contents of spacecraft products are summed up relative to the dynamic test purposes and evaluation criteria are setup corresponding the evaluation contents. Though it, the transient characteristics of spacecraft products are evaluated which provides a reference for judging the reliability of spacecraft products.
Studies on Dynamic Parameters of Intellectual Vibratory Roller
Authors: Gong Tao , Liu Bai Xi
Published: November 2012

In order to anlyse the compaction process of vibrating roller more accurately, this paper built a new 6-DOF Vibration system dynamic model under the coupling operating condition of intellectual vibratory roller considering the qualities of soilmass and applied the new model on a type of intellectual vibratory roller’ dynamic analysis. On that basis, we optimized the design parameter of this vibratory, and found out the optimum working parameters. It would realize the effective control of intellectual vibratory roller in the process of compaction, advance the density and compaction efficiency in compacting process, and improve comfortabilityg of the complete machine. At the same time, it also provided an effective numerical basis for the optimization design of vibratory roller.
Study of Data Fusion Method for Fault Diagnosis Based on FDR Feature Selection Algorithm and HMM/SVM Model
Authors: Li Sheng , Zhang Chun Liang , Hu Liang Bin
Published: November 2012

To effectively avoid the loss of useful information, in this paper, we extract feature information from the fault signal of rotating machinery in different aspects such as amplitude-domain, time-domain and time-frequency domain. Then for the multi-dimensional feature extraction is prone to the problem of “dimension disaster”, introduce the principles of FDR in data mining to determine the classification ability of each individual feature, and introduce the cross correlation coefficient to solve the problem that dealing with individual feature neglects the interrelationship between the features, and construct a new feature level data fusion algorithm. Finally, According to the characteristics of the HMM (Hidden Markov model), SVM (Support Vector Machine) and its hybrid model, we construct a new decision-level data fusion model.
The Systematic Thinking of Traffic Accident Vehicle Brake Performance by Road Test Verification
Authors: Wei Chao , Gao Xiang , Nie Miao Xin
Published: November 2012

After the traffic accident, it needs to confirm the cause and responsibility of the accident, and whether the bad brake performance is the important reason for the accident. At first, this paper has put forward the road test standard of the brake performance and comprehensively analyzed the braking process. Except the theoretical analysis, this paper has made a quantitative research on the influence of people, vehicles, road, environment and testing instrument on the brake result of the road test with the experiments and put forward some suggestions to reduce the influence of the test results.
Numerical Analysis on the Pressure Distribution of Long Oblate Chimney
Authors: Yuan Zi Hou , Zhan Zhi Lan
Published: November 2012

In order to investigate wind load for long oblate chimney, a commercial computational software “Fluent” was employed to solve the time-averaged k-ε turbulent flow model for Realizable form. The flow structure and surface pressure distribution on the long oblate chimney upon facing wind was obtained for the wide-face and the narrow-face, respectively. The windward side of long oblate chimneys bears positive pressure, while the largest negative pressure area is on both sides of chimney. The characteristics of the wind pressure distribution were explained by analyzing the flow around the chimney. These discoveries can be used as a reference, for the new version of the wind load criteria.
Analysis of Turbines Vibration and Treatment Measures during the Commissioning
Authors: Fang Guo Cheng
Published: November 2012

The phenomenon of higher shaft vibration and higher bearing temperature is repeated happening during the starting of the 1 000MW coal fired unit of Suizhong power station, seriously endanger the safe operation of the unit, this article mainly aims at the difficult problem of this one technology, by researching on steam turbine work principle and vibration analysis, to find the reason of effect on stability, and to correct all unreasonable factors, to ensure the safe and stable operation of the unit, to laid solid foundation for the construction of the intelligent power grid.
A Study on Natural Bionics in Product Design
Authors: Xie Hui
Published: November 2012

Bionic design is the inexhaustible source for innovative design. This paper focuses on how humans are inspired by plants and animals in the nature and apply bionic thinking to innovative design of industrial products. It will expound bionics in view of structure, texture, natural form as well as color and advocate the marriage of social production activities and the nature when designers, abiding by the bionic design philosophy of “learning from the nature”, establish a platform where human, product design and the nature are in harmony while endowing products with a sense of liveliness via bionic designs, bringing design back to the nature and enhancing the integration of human and nature.
Frictional Contact Problem Study on Compressor by a Parametric Quadratic Programming Method
Authors: Liao Ai Hua
Published: November 2012

A locomotive-type turbocharger compressor with 24 blades under combined centrifugal and interference-fit loading was considered in the numerical analysis. The solution of elastoplastic frictional contact problems belongs to the unspecified boundary problems where the interaction between two kinds of nonlinearities should occur. To save the time cost in the numerical computation, multi-substructure technique was adopted in the structural modeling. The effect of fit tolerance, wall thickness of shaft sleeve and rotational speed on the contact stress was discussed in detail in the numerical computation. To decrease the difficulty of the assembling process and make sure the safety of the working state, the amount of interference between the shaft sleeve and shaft by press-fitting should be controlled strictly to avoid the rapid increase of the contact stress. The numerical results show the high accuracy and good convergence of the algorithm presented here. The study play a referenced role in deciding the proper fit tolerance and improving design and manufacturing technology of compressor impellers.
A Systematic Research on Reconstructing the Accident Velocity with Braking Traces
Authors: Wei Chao , Nie Miao Xin
Published: November 2012

Braking trace is the important basis to reconstruct the speed of the accident vehicle. There does not exist one-to-one relationship between the barking trace and the vehicle speed. It needs to have a further research on the factors influencing their corresponding relations, otherwise it may appear great errors to reproduce the vehicle speed with the braking trace. This paper analyzes the influence of people, cars, roads, environmental factors on the corresponding relationship between the initial braking velocity and braking traces, explores the use conditions and parameters selection of the reconstructed model in the standard GA/T643-2006, and the experiment is designed to research on the uncertainty of the reconstruction of the model. Besides, it has proposed the experimental reconstruction method.
Inquiry Process of a New Transmission Mechanism
Authors: Cao Ju Jiang , Wang Yu Qi
Published: November 2012

In order to meet the requirements of synchronous output among multiple parallel-axis in some light industry machinery and avoid the traditional transmission ways’ defects, we put forward a kind of new transmission mechanism which is called the crank-group driving mechanism. This paper introduced the mechanism's inquiry process as follows: the movement that we need is a kind of uniform transmission , we choose the configurations of mechanism according to the requirements of movement; after comparison among various kinds of mechanism, we choose the parallelogram linkage as the prototype of the new mechanism, and the new mechanism is a evolution of it; we demonstrated the movability of the new mechanism from the point of view of freedom, and introduced the configurations of new mechanism.
Analysis of Bulging Application in the Wind Power Bearing Ring Production
Authors: Mei Yi , Xiao Shi Xia
Published: November 2012

Bearing is the core components of wind power equipment. According to the special requirement of high reliability, long life of wind power bearing, the current manufacturing defects of it has been analyzed, such as flange, pits, fish-tail, folding, and comparing with its current manufacturing method, which is called ring rolling, therefore, a new method called rolling and bulging-matching techniques is proposed, as wind power bearing ring should be released stress after rolling, then sized through bulging and once again to stress. Ring bulging is still a blank space in China; this project plans to research bulging process kinematics and dynamics analysis first. This paper gives a brief introduction of bulging processing and focus on the analysis of wind power bearing ring bulging forming.
The Construction and Practice of Teaching Method for Mechanical Principles Integration Course Based on CDIO
Authors: Lu Qian Qian , Wu Yang Fang , Sun Shu Li
Published: November 2012

In this paper, a teaching method reform is introduced based on the CDIO international concept of engineering education, to build the integrated teaching model of the mechanical principles that combines theory teaching, experiment and course design. During the reform, a schedule is made to arrange these three parts according to their contents, and joined all the content together so as to let students’ do related practices while learning new theories. This reform is aim at leading students change from passive learning into voluntary study, cultivating students' creative thinking so as to train students the abilities of conceive, design, implementation and operation. The results turned out that this method can free students from traditional teaching model and make a solid foundation for training a qualified mechanical engineer.
Integrated Model of the TRIZ Theory and Research-Oriented Teaching
Authors: Jiang Fan , Zhang Chun Liang , Liang Zhong Wei , Xiang Jiang Hua
Published: November 2012

In order to integrate between TRIZ theory and research-oriented teaching, relationship model of TRIZ theory and research-oriented teaching is studied, and indicate the integrated model is the supporting role in the three stages of students' innovative ability, such as experience, rethink, construction. Further, the integration scheme of the contextual design, process of students' inquiry learning, comprehensive evaluation of TRIZ in research-oriented teaching. Finally, the teaching practice examples applied of integration model is given.
The Design of Injection Mold for the Handset Based on Reverse Engineering
Authors: Wen Huai Xing , Wei Qian Xin
Published: November 2012

With the rapid development of advanced industrial technology and computer technology, using the reverse engineering to mold and simulate for products has already been an important trend in the modern product design, and it has also been an important technology in the CAD/CAM field, especially the field of the molding design. The article took telephone handset as an example, the point cloud data of the physical profile was done by the three-dimensional laser scan using the reverse engineering technology. The handset 3-D mold was given in Pro/E by the point-data processing, the curve and surface constructing. Finally the handset injection mold was designed. The study result shows that using reverse engineering to achieve the design of injection mold can not only effectively reduce the cycle of mold design, but reduce design cost.
Exploration and Practice of “Six in One” Ability Cultivation System of Independent College Students
Authors: Li Xiang Ran , Yu Guang Hui , Wu Qing Lei , Cui Zhi Yuan
Published: November 2012

College students’ practice and job capabilities are the core index of the social evaluation of the college’s running level and teaching quality. Based on the practice teaching reform, independent colleges should construct “Six in One” ability cultivation system including planned practice teaching system, extracurricular innovation practice system, extracurricular entrepreneurial practice system, professional qualification training system, practice teaching management system, and practice teaching security system.