bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Sea Bottom Acoustic Parameters on Acoustic Wave Transmission in Shallow Water
Authors: Han Jing , Hu Hao Hao , Meng Chun Xia , Zhang Xue Gang
Published: November 2012

The acoustic parameters of the sea bottom were an important factor which affected the acoustic wave transmission in shallow water. This work devoted to study the effect of sea bottom parameters on acoustic wave transmission. The sea bottom was divided into two layers. The acoustic wave transmission loss(tl) under different sea bottom parameters was computed using KRAKENC program in the frequency of 500Hz. The simulated results showed that the acoustic parameters of sediment layer had important effect on acoustic wave transmission and the acoustic parameters of basement layer had almost no effect on acoustic wave transmission.
A Boost White LED Driver with an On-Chip Compensator
Authors: Zhou Fei , He Le Nian
Published: November 2012

A monolithic peak-current-mode boost WLED driver with an on-chip compensator is presented. In order to predict the system performance, the equivalent circuit model of boost WLED driver is constructed to obtain the system transfer function. Then, an on-chip compensator, which requires small layout area, is analyzed and designed. The simulation results, based on CSMC 0.5µm 40V BCD technology, show that the internal compensation technique provides high loop accuracy and stability over a wide load range from 20mA to 180mA. The proposed driver is capable of driving 10WLEDs connected in series or 3WLEDs with 9 strings in parallel. Protection circuits, such as over voltage protection (OVP), over temperature protection (OTP), over current protection (OCP) and under voltage lockout (UVLO) are also utilized to guarantee the safe operations of the system.
The Optimized Negative Clearance Value with Reason in ASTM-Gr.D Fine-Blanking with Negative Clearance Blanking
Authors: Fan W.F. , Li J.H. , Li F.
Published: November 2012

This paper has established geometry model of the rigid-plastic Finite Element Model (FEM) basing on the foundation of similarity theory. It has simulated and analyzed the material of ASTM-Gr.D used by finite element analysis software of metal plastic DEFORM with different negative clearance values blanking, which obtains the caver of the different negative clearance values with roll-over with sheared zone with punching load. According to the result of simulation, it has made an experiment on the ASTM-Gr.D of 2.0(mm) thickness with the different negative clearance, and obtained samples with sheared well and no burr, which summarized that it could achieve no burr in fine blanking when the values of negative clearances value took -0.1 ~ -0.3mm.
Grid-Connected Solar Microinverter Study and Design Using a dsPIC Digital Signal Controller
Authors: Zhang Feng Ge , Zhu Shi Lu , Yin Xiao Ju , Teng Zhi Fei
Published: November 2012

An interleaved flyback converter using a dsPIC digital signal controller is researched and designed, regarding to photovoltaic (PV) grid-connected micro inverter’s characteristics, the system structure and control principles is studied, and a new method combining Constant Voltage (CV) and Perturb and Observe(P&O) to track the Maximum Power Point (MPP) is applied. The prototype experiments verify that the inverter can better realize the most power tracing and island detection function, at the same time reduce the current output ripple, lower its THD.
Application of Non-Inverting Buck-Boost DC-DC Converter in Photovoltaic Power Systems
Authors: Zhang Feng Ge , Teng Zhi Fei , Yin Xiao Ju , Zhu Shi Lu
Published: November 2012

The method of maximum power point tracker with PIC18F4520 controlling in photovoltaic power system has been described in this paper. Maximum power point tracker is implemented with a non-inverting buck-boost DC-DC conversion topology. The system is simple with good response speed. And the efficiency of system is approved apparently with the method.
Speech Signal Acquisition and Processing Based on DSP
Authors: Zhang Jun Hong , Tan Zhi
Published: November 2012

The design method of software and hardware was introduced about speech signal acquisition and process based on DSP chip TMS320C64X produced by TI company in this paper. The principle figure of the system, hardware interface circuits, software flow chart as well as relational experiment data and waves were also present.
A Low Temperature Coefficient, High Voltage Detection Circuit Used in Power over Ethernet
Authors: Hu Zhi Cheng , Ning Zhi Hua , He Le Nian
Published: November 2012

A low temperature coefficient, high voltage detection circuit used in Power over Ethernet is proposed. This circuit realizes the detection comparison without utilizing an extra voltage reference circuit and comparator while the temperature coefficient of the threshold voltage is as low as that of a regular bandgap reference. The proposed detection circuit is implemented in CSMC 0.5μm 60V BCD process, Cadence Spectre simulation results show that the temperature coefficient of the threshold voltage is 66.5 ppm/°C over the temperature range of -40°C to 125°C, and the maximum variation of the threshold voltage is 2.7% under all corners.
Analysis of Fatigue Residual Life of Zhuan 8AG Side Frame
Authors: Wang Hong , Shang Yue Jin , Liu Wan Xuan
Published: November 2012

Whether zhuan 8AG type bogie can achieve the requirement of speed increasing, which have become an important question need to face and research for the railway sectors. The residual life of zhuan 8AG side frame is studied by interior fatigue test that equivalent to the actual running conditions. The interior fatigue test data was processed by Weibull distribution with 3 parameters. The point estimation and the interval estimation of the safe life were given. The fitting result indicate that, the test date conform the Weibull distribution very well. Using generalized P-S-N formula and correctional two dimensional Miner’s rule derivate the residual running mileage prediction formula of zhuan 8AG side frame based on the interior test and the actual line test. The point estimation and interval estimation of residual life are computed under certain reliability and confidence. The estimation results show that, under 95% confidence and 99.9% reliability, the zhuan 8AG side frame has 10.6 years residual life at least. Thus, its’ prospect of applications by increasing speed is optimistic. As a result of some difference about forces on side frame between internal test and actual operation, high incidence area of crack in test is different from in reality. In this fatigue test, breakages are all the C position of side frame. However, the highest probability of crack occurred position in the top surface of pedestal, which total crack numbers accounted for 50% of total crack numbers on side frame in actual running. The paper recommends that the results between internal fatigue and actual operating should be analyzed comparatively, so as to simulate the actual working conditions more realistic.
Loss Analysis of Three-Level Active Neutral Point Clamped Converter under Fault Tolerance Operation
Authors: Jing Wei , Ding Ran
Published: November 2012

Compared with traditional three-level neutral-point-clamped (NPC) converter, the recently proposed three-level active NPC (ANPC) converter has the ability to overcome the unbalanced loss distribution, and therefore result in increased output power or switching frequency. In industrial applications, fault tolerance ability of power converters is very important considering system availability, safety and reliability. This paper introduced the control schemes to get stable and continuous output under single device fault for both open-circuit and short-circuit fault cases. By analyzing the phase relationship of reference voltage and load current, the loss calculation method under fault tolerant operation was proposed. Calculation results show that the devices junction temperatures under fault tolerant operation are within the safe operation area (SOA) even they are a little bit higher compared to normal operation, which also confirm the effectiveness of the fault tolerant control schemes.
Design and Improving Techniques for Uplink Reference Signal in LTE Compatible Mobile Satellite Communication System
Authors: Si Ying , Zheng Ya Dan , Ren Shu Bo , Wu Jian Jun
Published: November 2012

Reference Signal (RS) is used for channel estimation and sounding in LTE uplink of terrestrial system to accomplish data demodulation. However, the situation in multiple-beam mobile satellite communication system is different. The Uplink Reference Signal (UL-RS) designed in terrestrial LTE doesn’t fit the satellite environment and may result to system performance degradation. In this paper, the UL-RS pattern used in GEO multiple-beam mobile satellite communication system is proposed, as well as two enhancement techniques, i.e., full bandwidth sounding, retransmit and combined receive. System performance index calculation and simulation results prove the effectiveness of the proposed design.
Design and Improvement of Host and Backup Selection
Authors: Liu Zhen Juan , Wang Wei Jiang , Niu Hui Bo , Shen Ting Zhi
Published: November 2012

In order to resist the Single Event Upset（SEU）in outer space so that the camera focal plane array system could work in a long time, a design and improvement method for the selection of host and backup based on FPGA was introduced. VHDL was used to do the design and simulation, FPGA developed by Altera company was chosen as the hardware design platform. The results of experiment showed that the improved module could reliably get a group of effective data from the two in all cases and the camera focal plane array system could produce reliable driving timing for the CCD camera.
Electromagnetism Compatibility Design of an Interference Antenna
Authors: Zhao Qiang , Peng Shi Rui , Wang Bing Qie , Zheng Chang Wen
Published: November 2012

Aiming at electromagnetism efficiency evaluation of large ground interference antenna is complex, the paper proposes to model and simulate it by FEKO and then the radiation pattern of the antenna can be obtained. The simulation result is conform to the fact. In view of the large power of the vice and back orientation of antenna from the simulation, adopt the method of installing electromagnetism shield wall to solve. Through the simulation shows the efficiency of electromagnetism shield wall in improving antenna’s electromagnetism compatibility.
Current Loop High Performance Compensation Control Strategy Analysis of Active Power Filter
Authors: Yuan Qian Qian
Published: November 2012

By particular theoretical analyzing on detection error of the traditional current loop proportion-integral (PI) controller, this paper points out the limitations of detection harmonic current at load side and proposes a current feedforward compensation controller. It can track harmonic instructions with zero static error and good compensation performance. Meanwhile, it overcomes the deficiencies of traditional load side detection harmonic current PI controller, with the traditional controller’s flexibility. Even if the load harmonic current is higher than the capacity of active power filter, it can basically maintain zero static error output and has certain theoretical significance and engineering value.
Suppression of Single Vector Hydrophone Coherent-Noise Based on the Cross-SCF
Authors: Zhang Wei , Cheng Jin Fang , Xu Jie
Published: November 2012

At present the cross-correlation processing can only suppress the isotropic noise by vector hydrophone sound pressure and vibration velocity combined. The coherent composition of the actual ambient noise makes the detection ability of cross-correlation spectrum reduced. Use XWVD theory, proposed a cross symmetry-correlation function (Cross-SCF). Analysis of simulation data under different SNR and Different nature noise combination proving that the noise suppression Performance of suggested Cross-SCF has nothing to do with noise properties, and compared with the cross-correlation processing have indeed better than coherent noise suppression ability.
An Auto-Test System Based on VEE for the Improvemet of Target Position Precision
Authors: Wei Ming , Chen Ning , Zhou Ju , Du Jing Chao
Published: November 2012

The influence of amplitude and phase errors on precision of target position is analysed. To reduce amplitude and phase errors, iterative algorithm is applied in calibration. In this algorithm, amplitude and phase characteristics of all microwave components need to be tested.In this paper ,an auto-test system developed in VEE and based on GPIB serial bus technology is introduced. Compared with the traditional manual testing method, the anto-test system improves efficiency and accuracy on the test of digital attenuator and phase shifter with high resolution.
An In Situ Dissolved Oxygen Monitoring System Based on Fluorescence Quenching Phase Detection
Authors: Zhang Tao , Ye Shu Ming , Han Ji Yu , Liu Jun Feng
Published: November 2012

As a major indicator in marine life research and geochemistry, the in-situ monitoring of dissolved oxygen has become increasingly important in the assessment of marine ecosystem. It has been proved that fluorescence quenching may result in shorter fluorescence lifetime. Based on it, this paper proposes an in-situ dissolved oxygen monitoring system of high precision and low power consumption applicable to long-term monitoring of complex marine environment. Using phase detecting method, an AC analog amplification channel on Precision photoelectric detection, and used digital phase detection method and three order integral average method to detect the phase offset. The ultralow-power microcontroller was used to control system. The experiments results show that the system has high stability, high precision(0.02mg/L), quick response time(≤40s), low power consumption(peak current ≤10mA), strong anti interference ability.
Detecting Edge Using Support Vector Machine
Authors: Yeh Jih Pin
Published: November 2012

The edge detection is used in many applications in image processing. It is currently crucial technique of image processing. There are various methods for promoting edge detection. Here, it is presented that edge detection can be achieved using Support Vector Machine (SVM). Supervised learning method is applied. Laplacian edge detector is an instructor of Support Vector Machine. In this research, it is presented that any classical method can be applied for training of SVM as edge detector.
Design of a Multi-Channel Temperature Circuit Monitoring System Based on PID Algorithm
Authors: Li Wei Wei
Published: November 2012

This design aims to realize the LCD display and the thermostatic control of the temperature. The design uses the ATmega8 micro-controller as the core part of the temperature monitoring system and the PID control algorithm to produce a PWM wave to drive the photoelectric coupler MOC3061, which can control the SCR on and off and then change the value of average voltage. Through the RS232 bus, it can build an intelligent distributed network of monitoring system. The simulate module by the MATLAB software has been built up to get the parameter tuning of PID and then get the best heating method to control the temperature quickly and accurately. With the compact and flexible structure and the good and reliable function, the design is suitable to the industrial control, environmental monitoring, etc.
A New Method of Harmonic Current Detection and Control Strategy of Compensating Current
Authors: Cheng Xiang , Zheng Tie Lin , Feng Gui Hong
Published: November 2012

This paper puts forward and realizes a detection method, which can extract harmonic and reactive current accurately when the network exists nonideal and asymmetric power grid voltages. From the view of vector analysis, through the d-q coordinates[1,2] project transformation of the three-phase voltage and current vectors, the harmonic and reactive current extraction is realized. The compensation current adopts forecast current control, obtaining a better compensation characteristic and control accuracy .From the experimental results of 5 kVA active power filter（APF）and 150 kVA mixing filters, the feasibility and the correctness of the proposed method are proved.
Power Supply Programs and Improvement of the Wireless Sensor Network in Environmental Monitoring
Authors: Wang Shu Guang
Published: November 2012

This document explains how to determine the power supply programs of WSN in environmental monitoring. The power consumption of Wireless sensor networks node in environmental monitor is estimated. The characteristics of several battery and super capacitor are analyzed; feasibility of long-term and stable power supply to the node is proofed. Different power supply programs are given according to the requirements of the working time and cost performance. The program which uses solar cells with maximum power point tracking technology, and use super-capacitor to store energy, is probed mainly. The circuit is design .It is tried in field.
Research on the Preparation of Fir Bacterial Fertilizer Using Biological Material
Authors: Zhou De Ming , Li He , Li Rong , Zhu Dan Xue , Tan Yi Ming
Published: November 2012

The azotobacter bacteria and the phosphate-solubilizing bacteria are separated and filtered from the rhizosphere soil of the fir plantation and the enzyme activity of azotobacter bacteria, the solubilizing power of phosphate-solubilizing bacteria and the characteristics of PGPR bacteria to produce IAA are measured in this paper. The results show that: there are 5 of the 16 azotobacter bacteria whose enzyme activity is greater than 150 nmol•mL-1•h-1, respectively NGJ-4, NGX-5, NGX-4, NGX-8 and NGJ-8. Py16, Py10 and Py3 own the strongest capacity to dissolve organic phosphorus, respectively 71.31 mg / L, 59.07 mg of / L and 65.14 mg / L; Pw10，Pw6 and Pw20 own the strongest capacity to dissolve inorganic phosphorus, respectively 232.0 mg/L，185.9 mg/L，172.6 mg/L. Py18，Py16 and Py3 own the strongest capacity to produce IAA and dissolve the organic phosphorus bacteria, respectively 38.80mg / L, and 37.29mg / L, and 35.79mg / L; Pw6, Pw8 and Pw21 own the strongest capacity to produce IAA and dissolve the inorganic phosphorus bacteria, respectively 45.340 mg/L, 39.340 mg/L, 27.480 mg/ L. Based on these results, the strains of NGJ-4, NGX-5 and NGJ-8 are selected to prepare the microbial compound bacterial fertilizer using Py16, Py3 and Pw6. Then the azotobacter bacteria, organic phosphate-solubilizing bacteria and inorganic phosphate-solubilizing bacteria is respectively diluted to the solution with the ratio of 15%, and then mix them with the volume proportion of 1.5:1:1 to obtain the mixed bacteria liquid; the proportion of solid carrier ash is 20%, the proportion of fermentation medium is 50%, and the proportion of the mixed bacteria liquid is 30%.
Influence Analysis of the Magnetic Properties of the Materials on the Magnetic Powder Clutch Characteristics
Authors: Wang Cheng , Xu Shan Zhen
Published: November 2012

The torque transmission capacity within a range of the structure is the main factor that limit the application of the magnetic powder clutch in the vehicle transmission field. In order to increase the torque transmitting characteristics of the magnetic powder clutch, the analysis model of the magnetic powder clutch was established with finite element numerical calculation method based on the depth analysis its operating principle, which focused on the study of the influence of the magnetic property of the magnetic powder and magnetic circuit material on the magnetic powder clutch performance. The research results showed that the greater of the saturated magnetic induction and the magnetic permeability of the magnetic powder and magnetic circuit material are, the better of the torque transmitting characteristics of the magnetic powder clutch is.
Modification for Fatigue Curves Based on Component Reliability
Authors: Cao Li Juan , Li Shou Ju , Shangguan Yi Jin
Published: November 2012

Based on component reliability and scatter factors of material, a new procedure is proposed to modify fatigue curves. The scatter characteristics of fatigue life and strength are investigated. The relationship between modified S-N curves and scatter factors of material is presented. The safety evaluation procedure for fatigue damage based on finite element analysis is performed.
Influence of Cutting Parameters on Torque in Drilling of Al-15%SiC-4% Graphite Metal Matrix Composites
Authors: Muniaraj A. , Lal Das Sushil , Palanikumar K.
Published: November 2012

Hybrid Metal Matrix composite consists of at least three constituents. Machining of metal matrix composite (MMC) is difficult due to the presence of hard abrasive particles. To make the composite prone to easy machining graphite is added. Machining is a material removal process and therefore is important for the final fabrication stage prior to application. This paper discusses the influence of cutting parameter on Torque in drilling of hybrid metal matrix composites. The experiments are conducted to study the effect of spindle speed and feed rate on torque using TiN coated solid carbide twist drill of 4mm, 8mm and 12mm under dry machining condition. The influence of parameters are discussed and studied in detail.
Structure and Composition Investigation of Amorphous Alloy Fe78Ni1Si9B12 during Thermal Processing
Authors: Fedorets Aleksandr , Kotvitckii Aleksandr , Modin Evgeny B. , Dubinets Aleksandr , Pustovalov Evgeny , Plotnikov Vladimir , Grudin Boris
Published: November 2012

This paper covers the investigation of the microstructure and magnetic properties of amorphous magnetic alloy Fe78Ni1Si9B12 films, which was subjected to thermal processing. Study of the surface with the help of phase analysis and Kikuchi-diffraction revealed the change of state of the alloy surface without the influence on its volume.
The Calculation and Analysis of the InP/InxGa1-xAsyP1-y Optical Properties by Molecular Dynamics
Authors: Zhu Ji Ming
Published: November 2012

This paper has studied the optical properties of the semiconductor materials InP/InGaAsP from the molecular dynamics under different temperature conditions, and analyzed the effect of the different doping ratio on the light absorption properties of InxGa1-xAsyP1-y。 The research of this topic provides a method from the theoretical calculations for in search of new fiber-optic sensing materials.
The Synchronization Time Influencing Factors Analysis of the Lock Ring Synchronizer
Authors: Wang Zhi Hong , Yan Fu Wu , Zhu Qing Shan
Published: November 2012

The paper takes the lock ring synchronizer as the research object, and introduces its structure, working principle. Through theoretical derivation, obtaining the calculation formula of the synchronization time and analyzing further the influeccing factors. The research has great help for the future design.
Control Laser Spectrofluorimeter with Microcontrollers
Authors: Davitadze Zaza , Gomidze Nugzar , Makharadze Kakha
Published: November 2012

For today carrying out of observational measuring and processing of the gained effects without computer technology practically is not available. The importance of using automatic devices becomes more and more obvious. In many cases, when the matter is to work out the experimental devices and methods, there is a problem connected with control of experimental devices and with carrying out automatic measurement. For a solution of this problem experimenters often use different special electric devices which connect experimental devices with computer technologies. For example, such devices are analog-digital (ADC) and digital-analog (DAC) converter systems of electrical circuits etc.
Numerical Analyses of Fluorescence Characteristics of Watery Media via Laser Spectroscopy Method
Authors: Gomidze Nugzar , Jabnidze Izolda , Makharadze Kakha , Khajishvili Miranda , Shashikadze Zurab , Surmanidze Zebur , Surmanidze Inga
Published: November 2012

As a result of man’s intensive activities, the pollution of the world oceans and the pollutions of domestic waters reached such scales that the natural mechanisms of clearance are not capable of their utilisation. It causes the breakage of ecological balance, which becomes more and more difficult to control and causes natural excitation on the future of biosphere. Anthropogenic pollution includes various components, among which, nowadays, the first place belongs to oil and oil products. Fighting against this kind of pollution is a modern problem. By the literal data, the annual anthropogenic flow of oil products in the sea is caused by the loss of oil on tankers. It is known number of contact and non-contact methods of the pollution analyses of oil. Among them, the spectral optical methods are widely used, the major advantage of which is their expressiveness and distance. The laser methods should also be mentioned. Among them, the most sensible method is fluorimetry.
Improvement of Electrical and Mechanical Properties of Inkjet-Printed Ag Tracks by Adding SiO2 to High Loading Ag Inks
Authors: Kosmala A. , Zhang Q. , Wright R. , Kirby P.
Published: November 2012

Monodispersed Ag nanoparticles with sizes down to 10 nm were synthesised in an aqueous medium. These nanoparticles were then successfully dispersesd up to 45 wt% in aqueous medium with the aid of a copolymer, Pluronic F127. SiO2 nanoparticles were added to the ink formula in order to improve the physical properties of the ink after inkjet printing. The effect of the different SiO2 concentrations in the ink on the adhesion, resistivity and microstructure of the film at several sintered temperatures was investigated. The percentage of the SiO2 added in the ink was responsible for the development of microstructure for the sintered silver films and improving adhesion of the films to the substrate. The addition of SiO2 had also significant effect on improving the conductivity of the films. The conductivity is, though, better when only a small amount of SiO2 was added.
Study of Energy Saving Lamp System for Sound and Light Double Control
Authors: Zhang Zeng Lin , Wu Pu Te , Yu Xiao Qing
Published: November 2012

The main content of intermittent lamp energy saving technology study in small public places is the circuit control system. A lamp energy saving control circuit system is developed and designed by using the timer 555 modules, Silicon controlled technology, power supply circuit, photosensitive and audio sensor module, etc. The system has sound and light double control and timing function, photosensitive and audio sensing circuit dormancy and lamp shut off during the day or light is good. In the evening or subtle lighting, photosensitive and audio sensors are opened at the same time, lamp working for 20 seconds through the human voice incentive and automatically shut off. The application and test show that the system circuit has low power consumption and strong generality promotion, and realizes the purpose of energy saving.
Construction of a Simple Electro-Chemical Analyzer
Authors: Jiang Li Ying , Zhang Yan , Wang Fen Fen , Hu Jie , Yan Yan Xia , Cui Guang Zhao
Published: November 2012

In this work, a computerized electro-chemical analyzer based on LabVIEW is proposed. This analyzer is made up of two main parts, the hardware part and software part. The former part consists of computer, data acquisition card, and signal conditioning module, which is clearly described in this paper. The software part includes data acquisition, data processing, data storage and data displaying that are programmed in LabVIEW. The measuring methods of cyclic voltammetry and chronoamperometry have been realized with this analyzer.
Microstructure Transformation of Nb-V Microalloyed Steel during Continuous Cooling Process
Authors: Li Xin , Zhao Jie , Bao Jun Cheng , Ning Bao Qun , Li Jian Ping
Published: November 2012

To achieve reasonable rolling technology of the novel Nb-V composite microalloyed steel, the continuous cooling transformation (CCT) curve was established by thermal simulation experiment. Microstructure and microhardness at different cooling rates were characterized using an optical microscope (OM) and microhardness tester. The results indicate that the critical quenching speed of Nb-V microalloyed steel is about 23 °C/s. The start and finishing temperatures of phase transformation decreased with the rise of cooling rate. Widmannstatten (W) structure appears at lower cooling rate interval. Microstructure transfers into martensite (M) and bainite (B) with obviously refined grains in higher cooling rate interval. Microhardness improves with the increase of cooling rates. Microhardness value is greatly improved to 298.6 HV at the cooling rate of 11 °C/s, which could be related to the formation of lower bainite during phase transformation process. When the cooling rate is above 29 °C/s, microhardness values remain unchanged basically. This illustrates that the microstructure of Nb-V microalloyed steel consists of martensite and lower bainite.
Multi-Objection Optimization Design of Automobile Transmission System
Authors: Wu Yong Hai , Wang Feng
Published: November 2012

In this paper the Six-speed transmission with belt overdrive gear of one automobile transmission system will be taken as research object, automobile energy utilization ratio and standing start continuous shift acceleration time will be regarded as objective function, the multi-objective optimization model of automobile transmission system will be established. The improved congestion degree calculation and choose operation method will be put forward according to the problem that poor population diversity when NSGA-II algorithm was used in the transmission optimization, the improved NSGA-II algorithm will be used to implement multi-objective optimization design on the automobile transmission system. Optimization results show that Pareto optimal solutions obtained from the improved algorithm are more evenly distributed and algorithms are more efficient. The improved NSGA-II algorithm used in this paper is also suitable for other areas of computing multi-objective optimization problem.
Kinematic Analysis and Simulation of MID Laser Direct Structuring Equipment
Authors: Wu Yan Jun , Zhuo Yong , Peng Juan , Wu Xuan , Zhao Xin
Published: November 2012

Molded Interconnect Devices (MID) is an innovative technology in the field of mechatronics which abandons the conventional circuit boards and integrates the mechanical and electronic functions directly on the 3D injection molded thermoplastics. The Laser Direct Structuring (LDS) is the most efficient and advanced technology for the manufacrure of MID. In this paper, LDS technology and equipment have been introduced. Then through kinematic modeling analysis of the LDS equipment, getting the forward and inverse solution of laser focus position in the 3D space. And the LDS equipment processing path has been planned based on the kinematic analysis. Finally the simulation system of LDS has been developed based on Open CASCADE in order to inprove the processing efficiency and quality of MID.
Machine Tools Thermostabilization Using Passive Control Strategies
Authors: Aggogeri Francesco , Borboni Alberto , Merlo Angelo , Pellegrini Nicola
Published: November 2012

The aim of this study is to investigate passive control strategies using Phase Change Materials in Machine Tools (MTs) thermostabilization. By considering the main issues related to the thermal stability, authors presented the application of novel multifunctional materials to Machine Tools structures. A set of advanced materials are considered: aluminium foams, corrugate-core sandwich panels and polymeric concrete beds. The adopted solutions have been infiltrated by phase change materials (PCMs) in order to maintain the thermal stability of MTs when the environmental temperature is perturbed. The paper shows the results of simulative and experimental tests.
Trajectory Tracking Control of Mobile Robot Based on Self-Adaptive PID Combined with Preview and Fuzzy Logic
Authors: Li Da Lei , He Zhan Shu , Yin Yue Feng
Published: November 2012

A new method for controlling the steering and trajectory of the electric mobile robot is proposed. In order to control the robot’s position and heading, the path error and the heading error of the robot are taken into the control closed loop. On the basis of the self-adaptive PID control method combined with preview theory and fuzzy logic, a trajectory tracking control system is designed. Finally, experiments and simulation are conducted to test the control system. Both experimental and simulation results show that the mobile robot can approach the target trajectory quickly and then move along it, which confirm the validity and the efficiency of the trajectory tracking control system.
Data-Driven Tolerance Analysis for Products Assembly
Authors: Wu Bao Zhong , Qiu Jing , Li Guo Xi , Gong Jing Zhong , Yin Xin
Published: November 2012

Tolerance characteristics have an important influence on products dynamic properties. To realize dynamic properties oriented tolerance analysis and design of mechanical products, a data-driven based tolerance analysis method was proposed. Firstly, based on the cloud model theory, an assemble cloud model was established, and a new method of assembly data processing and knowledge mining was proposed. Secondly, the assembly cloud model was used to analysis the measured data from practical assembly process and search the alignment laws. Finally, using the above mentioned methods, product key parts tolerance was analyzed and adjusted, and the product quality consistency could be improved dramatically.
Cutter Exit Effects during Milling of Thin-Walled Inconel 718
Authors: Wanner B. , Eynian M. , Beno T. , Pejryd L.
Published: November 2012

During milling of thin-walled components, chatter vibrations give rise to process issues. These include dimensional inaccuracy, damaged and scrap parts, and damaged cutting tools. This, in turn, leads to loss of production time with increasing cost as a consequence. This paper identifies the force profile during a single cut milling process. It focuses on the exit and post-exit behavior of the cut and discusses the process dynamics. The force profiles of various tool-to-workpiece positions are analyzed as regards the exit and post exit phases. A standard on-the-market cutter and a specially designed zero rake cutter are used in the investigation. Finally, a time-domain simulation of the force is performed and compared to the experimental results. The study concludes that a small change in exit angle may result in a considerable improvement in cutting behavior. In addition, the tool position should be chosen so that the cutter exits in the least flexible direction possible for the workpiece.
Some Potential Negative Impacts of Nanomaterials on Human Health and Environment
Authors: Chen Ying Jian
Published: November 2012

Some latest research progresses on the potential negative impacts of engineered nanomaterials on human health and the environment are reviewed. Open problems about such aspects are addressed.
Design of a Small Welding Wire Feeder
Authors: Cao Yu Bao
Published: November 2012

Wire feeder is a welding wire delivery device widely used in TIG and CO2 gas welding. Smooth wire feeding directly affects the quality of welding. A small welding wire feeder was improved. The wire feeder and the welding wire plate were centrally located in the torch. This has reduced the wire transmission resistance and increased the mobile flexibility. Practical application proved that it has the characteristics of wire feeding stable and reliable, high welding productivity and high quality and stability of weldments. It has a significant impact on improvement of the existing welding and broad application prospects in welding industrial production.
Structure Design and Analysis of a High-Speed Camshaft Grinding Carriage
Authors: Zhang Guo Jun , Liu Yi Lin , Zhang Shang , Peng Bi , Huang Yu
Published: November 2012

In this paper, the overall structure of a high-speed camshaft grinding carriage and the key components such as electric spindle system and feed system are presented. The model analysis of the electric spindle and grinding carriage box is established to verify the feasibility of the design.
Application of Wavelet Analysis to Fault Diagnosis of Mechanical Equipment
Authors: Xu Shan Zhen , Wang Cheng
Published: November 2012

Aiming at the characteristics of mechanical gear transmission, taking automobile main reducer as research object, this paper analyzes the gear transmission of failure mechanism and failure characteristics. According to the good time frequency character and adaptive ability of wavelet analysis, it proposes gear fault information extraction method based on wavelet packet analysis and have carried out simulation analysis. The results show that the method of wavelet packet analysis can effectively detect mutations in the signal part and noise to achieve the diagnosis of mechanical system failures.
Optimization Design of Vehicle Frame Based on ANSYS
Authors: Wu Yong Hai
Published: November 2012

A special vehicle frame as the research object, its topology optimization mathematical model and its algorithm is established based on variable density method. Topology optimization method of continuum structures is applied to the frame structural design of this special vehicle using Optistruct solver. Take the least flexibility of frame as design goal; topology optimization design of frame structure was carried under the condition of flexure, torsion and flexure-torsion. New structural model of frame was determined according to results of topology optimization and engineering experience. The calculation of the stress, deformation and the volume for optimization results was conducted with ANSYS software, and compared with the data before optimization. The results showed that the safety performance of optimized frame improved, and the weight reduced.
Design of Locomotive Coupling Transmission System Based on WLAN
Authors: Qiu Fu , He De Qiang , Yao Xiao Yang , Miao Jian
Published: November 2012

The locomotive coupling came from the development of heavy-haul transportation in railway. Considering the insufficiencies of cable and radio in locomotive coupling at present, a new method of locomotive coupling is presented in this paper. The overall design of system scheme is provided based on WLAN. The system feasibility is analyzed and verified by using OPNET Modeler. The hardware structure of coupling transmission device and development process of embedded operating system are described briefly. Finally, taking measures guarantees the system reliability of data transmission.
Study on Blood Compatibility of a Disposable Burette Transfusion Apparatus and its Pyrogen Test
Authors: Huang Ying , Yang Yang , Liu Fen Ju , Liu Qing Fang
Published: November 2012

The aim of this study is to evaluate the blood compatibility of disposable burette transfusion apparatus and provide the basis for the clinical safety of medical products. Whole blood clotting time (WBCT), prothrombin time(PT),partial prothrombin time(PTT), hemolytic rate and bacterial endotoxin were measured. The results showed that there was no significant difference between the samples and the negative control on indexes of WBCT, PT and PTT (p>0.05), hemolysis test showed that the hemolysis rate of the sample was 1.38% (less than 5%), which was coincident with the criteria of the medical devices. Endotoxin levels were lower than 0. 5 EU/ml. All of the results above suggested that the disposable burette transfusion apparatus had a good blood compatibility and no pyrogen.
Research of Vibration Error Compensation for Inclinometers
Authors: Li Hong Xu , Pan Ming Hua , Wang Long , Zhu Guo Li
Published: November 2012

The inclinometers play a key role in the measurement of attitude angles of TBM. During the tunneling process, TBM suffers larger vibration and impact, because its construction environment is mostly mountain which is quite different from the ordinary shield tunneling machine whose is city soft soil. It will have an effect on the correct output of inclinometers in the position and orientation measurement system. Based on the principle of wavelet transform and vibration isolation, this paper presents a vibration error compensation method of the inclinometer to reduce the vibration error and fulfill the accuracy requirements of the attitude angles of TBM. On the basis of error analysis of the vibration measurement experiment of the inclinometer, process the vibration experiment data in different calibration angle and verify the efficiency of this method. Based on this method, it can eliminate the vibration error of inclinometers in any angle in time to achieve the purpose of output correction.
Support Optimization under Static Force of Large-Scale Propeller Blade
Authors: Yang Jian Zhong , Gong Xiu Mei , Zhou Jin Qiang
Published: November 2012

The large marine propeller blade is deforms easily because of the cutting force in the process. In view of this situation, the distribution of support positions is researched. For the irregular shape of propeller blade, combine VC with ACIS and get the coordinates of the points on the space surface according to the points of the parameter interval. Optimize the distribution of support points using the method which combine the secondary development of ANSYS with Genetic Algorithms, and get reasonable support positions. By the combination of the above several ways, the optimization of support positions can be realized, and the target of reducing the deformation of propeller blades can be reached.
A License Plate Recognition System Based on HSV Space in Natural Lighting
Authors: Zhang Zhi Bin , Liu Zhan , Song Yong Sheng , Wang Hai Yue , Tang Guo Jun
Published: November 2012

In recent years, with the development of modern traffic demand, the automobile license plate recognition technology has obtained more and more attentions. In this paper, the license plate in the vehicle image is located by extracting the color feature in HSV color space. And after binarizing the license plate image, the vertical scanning procedure is used to segment the license plate characters, and the template matching procedure are used to recognize the characters according to the similar degrees. Experimental results show that the system designed in this paper can effectively recognize the license plate in natural lighting, with the accuracy up to 95% for the Chinese characters, 90.4% for the numbers, 84.4% for the letters, and the time consumption being second level.
Design of Performance Testing Bed for Hydraulic Products of Engineering Machinery
Authors: Liu Zhi Hai , Zeng Qing Liang , Kang Hong Xi , Wang Cheng Long
Published: November 2012

Hydraulic test platform is a very important testing tool for hydraulic products of engineering machinery. In this paper, a new type of hydraulic test bed is developed which can be used for performance testing of hydraulic valves, hydraulic motor and hydraulic pump. The composition structure diagram of hydraulic system, power supply system, and the signal flow diagram of data acquisition system were designed. The communication between sensors and computer via RS232 were researched. At last, the hydraulic test software is developed by using Labwindows/CVI and Simense PLC.
Modeling and Simulation of Vehicle Hydraulic ABS Based on AMEsim
Authors: Zhao Qian , Duan Jia Jun , Wang Cheng
Published: November 2012

At present, the ABS braking system has been widely used in vehicle brake system, has become the important mechanism of automobile brake performance. This paper use the advantage of AMESim software for hydraulic system modeling, and build up the the model of ABS for the automobile brake system according to ABS system working principle, Simulation of automobile ABS hydraulic brake system work process, through the relevant parameter settings, compare and analysis the impacts made by some elements of the whole ABS system, finally make the foundations for the brake system for further optimization and improvement.
Automatic System for Identification and Analysis of Burst
Authors: Ma Nan , Chen Xin Hao , Liu Xiang Ming , Bai Yun
Published: November 2012

Although there are complex patterns of discharges exist in neurons, which are often clustered in bursts, the pattern of the burst discharge can substantially change with the alternation of the living environment of the neurons. Furthermore, there is a big difference in the physiological and pharmacological characteristics of various types of burst discharges. So it is necessary to analyze the information contained in various types of burst discharges. Here, an automatic system for identification and analysis of the neuron discharge based on plotting histograms of the logarithm of the interspike interval was designed. The system consists of neuron discharge collecting unit, neuron discharge processing unit, battery monitoring, real-time charging unit and bursts processing software. The system can identify the burst discharge from the neuron discharge without any omission and make statistical analysis. By using this device, the electrophysiological experiment that the spontaneous and evoked discharges of wide dynamic range neurons in spinal dorsal horn of rats were recorded was smoothly completed. The result of statistical analysis indicated that the device can give the corresponding interspike interval aimed at various types of burst discharges and respectively identify the burst discharges in the different amplitude spikes, which provide a tool for further research on the biosensor and the neural communication.
Optimization Design of Front Suspension Spring Cover
Authors: Fan Qin Man
Published: November 2012

Taking the front suspension spring cover of a tractor as the research object, the ANSYS as topology optimization design platform, the minimum value of the volume of spring cover as the objective function, the strength and stiffness of the spring cover does not exceed the set value as the constraint conditions conduct topology optimization and obtained spring cover topology shape optimization model. The results showed that the optimized spring cover, while maintaining the original structural strength and stiffness properties, the new spring cover materials than the original proposal to reduce by 12.9%.
Development of the Home Energy Management System Learning Materials Using LEGO MINDSTORMS
Authors: Nakajima Yoshito , Kaburagi Takahiro , Misu Takayuki , Koh Keishin , Kanai Norikane
Published: November 2012

Technique and also education for energy saving is attracted attention in Japan. The suggestion about the energy management system utilized embedded technology using microcomputer control and a network system has been proposed. Home energy management system can be produced in replacing with ideas of robot control system. In this paper, we report the project to producing of model of Home Energy Management System utilizing a robot control technology with the LEGO MINDSTORMS Experimentally in PBL and it is developed the teaching and learning materials for high school students who could understand a flow of the energy management and energy saving.
Development of Study Aids and Project Activity Procedures for STEM Educatio
Authors: Yoshino Kazuyoshi , Kurita Yasunari , Zukeran Akinori , Misu Takayuki , Iida Yasuhiro , Kanai Norikane , Koh Keishin
Published: November 2012

It is important to develop a student’s awareness to enable them to understand and apply the basics of sciences, mathematics, and engineering. In this study, we aim to implement STEM (Science, Technology, Engineering, and Mathematics) education by enabling students to gain awareness on their own. We propose study aids and procedures for a project activity using study aids for STEM education. To enable students to gain awareness, teachers should provide a study environment that empowers students to develop their own solutions and plans and to actively develop and test their models. The project-based learning (PBL) system provides an appropriate study environment. Based on this viewpoint, we developed study aids using LEGO MINDSTORMS Set and Simple & Powered Machines Set as materials and procedures for a project activity using the study aids for PBL education. We also give examples of project activities implemented in our education system for students in various fields and we report the responses of students who participated in these project activities.