bluuebunny/crossref_metadata_2025 huggingface dataset:
A Novel Autonomous Docking Method of Unmanned Marine Vehicle Based on Manipulator
Authors: Chen Jin Lei , Dai Yuan , Zheng Zhong Qiang , Chang Zong Yu , Dai Wen , Wen Zhen Wei , Zhao Xin Lei
Published: August 2013

To extend underwater duration is an important issue for autonomous underwater vehicles. Limited duration restricts the working ability of an unmanned marine vehicle (UMV) and needs frequent surface support. One of the solutions to this problem is docking that can implement functions as recharging, data exchange, maintaining and so on. A novel docking method based on manipulator assistance is carried out. In this method, a fixed handle near docking port is caught by the manipulator on the vehicle firstly. The manipulator can be controlled to obtain the vehicles body a suitable position and orientation for autonomous docking. The manipulator with floating based can be looked on as one serial manipulator with a fixed anchor. The kinematics analysis is given by using the MATLAB and ADAMS. The simulation results suggest that docking method has more stability and accuracy, and it can also reduce the collision between docking port and the vehicle. The method provides a conception of docking process between all kinds of unman marine vehicles and docking ports.
Development and Analysis of a Thermal Tracking System
Authors: Lien Cheng Chang , Liu Wei Ting , Lin Jeng Liang
Published: August 2013

A design is presented for the manufacture of a two-axle rotational platform equipped with a thermal camera, allowing the camera to track hot targets. The platform features a position adjustment mechanism to shift the focus of the thermal camera to match the platforms rotational center. In addition, a control system was developed using Visual Basic to integrate the cameras Software Development Kit (SDK), was developed to display real-time thermal images and to control the platform based on a hot target in the thermal image, thus achieving thermal tracking. Position experiments for the thermal camera showed that cameras focus is can be maintained close to the platforms rotational center by placing the cameras reference surface 2 cm in front of the rotational centers surface. Accuracy experiments were conducted to measure angle errors of the two-axle platform, with results showing maximum horizontal and elevatory rotation errors of 0.0375° and 0.025°, respectively.
Remote Multi-Processor Updating System Based on In-System Programming and CAN-Bus
Authors: Qi Sheng Bo , Zhang Meng , Wang Zhen Hao
Published: August 2013

The tidal current energy generation system, which works underwater and is interfered by electrical transmission during the process of data communication, has field update requirements but cannot directly use In-System Programming (ISP) to update, so a remote multi-processor updating system is developed based on ISP and CAN bus. This system consists of a shore station host computer, master controller and the slaves. The host computer transmits the HEX file to the master controller via CAN bus, and the master controller updates the appointed slave by ISP. This paper studies retransmission mechanism and ISP process. The system avoids failed update caused by data channel interference through separating the HEX file transmission and the ISP process.
Precision Forging Process Analysis and Preform Optimization of Small Compressor Blade of Titanium Alloy
Authors: Xu Wen Chen , Shan De Bin , Zhang Wei Feng , Lu Yan
Published: August 2013

Small compressor blades of titanium alloy are important mechanical structural components of advanced aircraft engines. In the present study, the preheating scheme and the forging process of the small compressor blade were modeled by the commercial software DEFORM3D and the forging experiments were conducted on a 10,000KN screw press. The results show that the reasonable preheating temperature for the small blade should be controlled in 960-970°C. The geometric shape and size of the blade preform influenced not only overlap and underfilling defects but also the dimensional precision of small compressor blade forgings. On this basis, the optimized geometric shape of the blade preform was obtained and the compressor blades were well formed by limited forging process experiments.
Study of Martensitic Transformation Temperatures of Ferromagnetic Shape Memory NiMnGa Alloys
Authors: Song Gen Zong , Zhang Duo
Published: August 2013

As a new class of shape memory alloy, Ni2MnGa ferromagnetic shape memory alloy (FSMA) has both large reversible strain and higher response frequency, which has attracted considerable attention and has been widely investigated.The martensitic transformations temperatures of the as-cast Ni2MnGa alloys are investigated by differential scanning calorimeter (DSC). Following conclusions were obtained from experimental results: By using DSC measurement, martensite transformation temperatures (including Ms, Mf, As and Af) were obtained in two alloy series of Ni51.5+xMn23.5Ga25-x and Ni51.5Mn23.5+yGa25-y. Results showed that: martensite transformation temperatures enhanced with the Ni and Mn increasing respectively, and the effect is stronger for Ni than Mn. After 600°C vacuum annealing 6h using powder samples, the martensitic transformation temperature was slight lower than as-cast state.
The Monolithic Silica Aerogel Derived from MTMS/TEOS
Authors: Yu Yu Xi , Chen Yong
Published: August 2013

The experimental results on the synthesis and characterization of tetraethoxysilane (TEOS)/ methyltrimethoxysilane (MTMS)-based silica aerogels using two step sol-gel process via supercritical drying, are described. The obtained TEOS/MTMS-based aerogel showed properties of 0.1g/cm3 density, 95.5% porosity and 1070 m2/g specific surface area.
Development of Automatic Hot-Water Insulation System for the Weaned Piglets of Nursery Using Biogas-Combustion
Authors: Lien Cheng Chang , Mei Jun Han , Lei Perng Kwei
Published: August 2013

This study is aim to develop an insulation system which have a burner using the biogas as fuel for the nursery of the pig farm and a ventilation system to maintain the air quality of the nursery. To eval uate the uniformity and the insulation effect of the heating insulation, this study investigated the temperature and the relative humidity of different locations and carbon dioxide concentration of the nursery in the conditions of the hot water temperature 70°C, the hot water flow rate 0.045 m3/min, the indoor temperature 28°C, the stocking density 1.4 pig/m2and four different frequencies of the ventilation system. The result shows that the insulation system can not only maintain the indoor temperature stability and uniformity and keep the temperature that weaned piglets desired (28°C), but also display that the magnitude of the temperature change is extremely small (<± 0.1°C). The relative humidity and the concentration of the carbon dioxide decreased with the increasing of the ventilation frequency. The difference of the temperature was about 0.9-1.03°C and the difference of the relative humidity was about 3.87-4.92%. The heating system can reduce the emissions of the greenhouse gas and save the electric cost of heating-lamps, and it is feasible to operate and adjust the suitable temperature for the growth environment of weaned piglets.
Studies on High Strain Point Aluminosilicate Glasses
Authors: Tian Ying Liang , Cheng Jin Shu , Zhang Lei , Sun Shi Bing , Zhang Jing
Published: August 2013

A family of alkaline earth aluminosilicate glasses has been introduced in this paper, that exhibit a high strain point temperature in excess of 740°C, the coefficient of thermal expansion of (27~38) ×10-7/°C. The glasses consist of SiO2 59-80 mol%, Al2O3 10-25 mol%, CaO 5-10 mol%, SrO 1-4 mol%, ZnO 4-6 mol%, SnO2 0.08 mol%, ZrO2 0-4 mol%, Y2O3 0-2 mol%. Their properties show that these glasses can be used as substrates with polysilicon (p-Si) thin film coating on their surface, in particular, for flat panel displays.
Analysis of Eccentric Load Effect for Tiliting Pad Journal Bearing
Authors: Yin Ming Hu , Chen Guo Ding , Zhang Guo Yuan
Published: August 2013

Most of the studies about tilting pad journal bearings are for load-on-pad or load-between-pad tilting pad journal bearings, and for the other loading forms, the performance are often estimated by the performance of the two limited conditions, that may reduce the reliablity of bearing design or lead to waste materials in design. To obtained the influence of the load directions on the static and dynamic characteristics of the tilting pad journal bearing, which is called eccentric load effect in this papers, the performance calculation of the tilting pad journal bearing in different load directions is operated with a self-designed program. The results show that the load directions have considerable effects both on the static and dynamic characteristics of the tilting pad journal bearing, for the operating condition that load direction changed rapidly, it need performance analysis of the bearing in its special loading forms to enhance the precision and efficiency of bearing design, espacially where the dynamic performance of the tilting pad journal bearing is demanding.
Computational Study on Cu Clusters Supported on Au(010) Surfaces at Atom Scale
Authors: Zhang Duo , Zhang Lin
Published: August 2013

The geometry structure and adsorption energy of Cu cluster adsorbed on Au (010) surface were affected by both the height of adsorption site and temperature. The height of adsorption site has major impact on the geometry structure and adsorption energy of the cluster when the temperature is low; while it has minor impact on the geometry structure and adsorption energy of the cluster at higher temperature. The adsorption energy is relevant to the atom number of the first layer on the surface vector of the clusters.The structural of Cu clusters on Au surface and its diffusion properties were studied in this paper by molecular dynamics simulation method and computer graphics techniques. The interaction potential between atoms is adopted by EAM form proposed by Johnson, simulation adopted by canonical ensemble of molecular dynamics method, and computer simulation was adopted to simulate the atomic structure of copper clusters of different amounts of atomic layers at different temperature during heating process. Moreover the analysis of the distribution function and the mean square displacement curve were performed by two representativ kinds of copper clusters Cu55, Cu201.
Research and Development on Materials Management System of Foundry ERP
Authors: Wang Hong , Zhou Jian Xin , Ji Xiao Yuan , Tang Hong Tao
Published: August 2013

Materials management is one of the indispensable parts in enterprises activities, and one of the most core functional modules of ERP system. Materials management level will directly affect the process of enterprises production control. Firstly, this article analyzes three important parts of materials management in foundry enterprises: materials resource planning, materials procurement and materials inventory. Secondly, a deep research is made on the data flow of materials management inner foundry enterprises, the modules of materials management subsystem based on HZERP are founded, which is designed for foundry enterprises by Center of InteCAST Software, HUST. Finally, an application instance in an integrated foundry enterprise is given to prove the availability of the system.
Research on Engine Cranking Process in Downhill Braking Condition for an Electric Drive Underground Dump Truck
Authors: Zheng Shu Yang , Jin Chun
Published: August 2013

The retarder braking system of an electric drive dump truck is introduced in this paper. When the truck is going downhill at a low speed, part of the braking energy is consumed by braking resistance system, other energy is changed into AC power by inverter module, the diesel engine is dragged from an idling speed to a high speed by the synchronous motor, energy feedback is realized. In this paper, to achieve synchronous motor starting, a zero crossing detection and frequency searching method based on rotor speed sensor is used,.The experiment shows the engine is started steadily and the current shock becomes flat.
Influence of Heat Treatment on Microstructure and Tensile Property of Ti-5Al-5Mo-5V-3Cr-1Fe Alloy
Authors: Fu Yan Yan , Hui Song Xiao , Ye Wen Jun , Mi Xu Jun
Published: August 2013

The effect of solution and aging temperatures on microstructure and tensile property of Ti-5Al-5Mo-5V-3Cr-1Fe Alloy was investigated. The results showed that the tensile strength lowered, when the solution and aging temperature rose respectively. The alloy with different heat treatments showed better tensile strength totally, i.e. the minimum level of ultimate and yield strength passed 1280 MPa and 1245MPa. The highest ultimate tensile strength could reach 1445 MPa. After (α+β) solution and aging treatment, the microstructure consists of primary α phase and transformed β phase with fine secondary α phase precipitating to improve the tensile strength effectively.
Optimization of Thermoplastic Pre-Pregs Overmoulding
Authors: Carreira Pedro , Alves Nuno , Ramos Carina , Bartolo Paulo J.
Published: August 2013

The search for new technological concepts in the field of injection of thermoplastic polymers, in order to optimize the process and reduce cycle time, faced us with a new concept in moulding, where two different technologies are proposed to be unified. The fabric impregnated with thermoplastic is an example of a quite new product that combines the potential of polymers with long reinforcing fibres. In order to process this new product, injection of polymers and thermoforming will be applied in only one operation. To allow cycle time prediction for this new technique, changes will be made in the formulation of conventional injection cycle time, in order to comprise the new necessary stages. In this work a new approach is proposed to obtain moulded parts of thermoplastic polymers with functional fabric only in a single processing cycle. The description of the new stages and its mathematical formulation is made, in function of the time needed to complete each one. The results presented come from processing parameters optimization using the Particle Swarm Optimization (PSO) algorithm.
Measurement of Internal Residual Stress of the Laser Rapid Forming Parts by Incremental-Step Hole Drilling Method
Authors: Lai You Bin , Liu Wei Jun , Zhao Yu Hui , Wang Fu Yu , Han Wen Chao
Published: August 2013

In order to study the residual stress distribution in the titanium alloy laser rapid forming parts, the incremental-step hole drilling method is improved. Choose a calibration sample which has the same material as the test sample to conduct internal residual stress measurement by incremental-step hole drilling method. Conduct stress-release heat treatment (insulation 4 hours in 750 centigrade, furnace cooling) to the calibration sample before the measurement to uniform the internal stress. Calculate calibration compensation coefficient according to the calibration sample stress measurement result, and use the compensation coefficient to compensate the stress measurement result of the laser rapid forming sample. This method improves the reliability of internal residual stress measurement by incremental-step hole drilling method. Then use this method to measure the stress of laser rapid forming sample. The result shows that both the residual stress in the X direction and the Y direction is larger when the depth ranges from 1 mm to 3 mm. When the depth is greater than 3 mm, the residual stress decreases gradually with the hole depth increasing. The maximum value in the X direction is 147.13 MPa, and the maximum value in the Y direction is 236.32 MPa.
Design Defects Immune Identification Methodology for Mechanical Products Based on Directed Graph of Assembly Constraint Relationship
Authors: Lv Gang , Fan Shou Wen , Zhou Lian Xu , He Xin Nuo
Published: August 2013

In order to identify design defects in mechanical product quickly and accurately, geometric constraints relationships between mechanical parts are formulated as critical functions, assembly constraint relationship (ACR) matrix is established based on encoding of geometric constraints between mechanical parts. Directed graph is employed to describe constraint relationship of ACR matrix, the node in directed graph denotes parts number, data structure of node stores the design parameters of mechanical parts, weights of directed graph arcs represents geometric constraint type. Weights of directed graph arcs are treated as antigen, design defects for mechanical parts are treated as antibody, mutation rules such as trimming, splicing and replacement is employed to identify design defects of antigen gene. Identification example of spherical mechanism demonstrates effectiveness and accuracy of above methodologies.
Manufacturing Technique and Property Evaluation of Polyester/Polypropylene Fasciated Yarn Used in Geogrids
Authors: Chen Jin Mao , Lou Ching Wen , Lin Ching Wen , Hsing Wen Hao , Lin Jia Horng
Published: August 2013

The successive civilengineering disasters in recent years make the use of geomaterial for disaster prevention popular. Geogrids, one type of geo-material, function as soil reinforcement. This study uses polypropylene (PP) fibers to wrap high strength polyester (HSPET) fibers, forming the PP/HSPET fasciated yarn. PP fibers are acid-resistant and alkali-resistant, and thus serve as the skin of the fasciated yarn. HSPET fibers, the core of the fasciated yarn, protect and prolong the service life of the resulting geo-material products. Finally, the influence of mechanical parameters on the appearance and strength of the fascinated yarn is explored.
Processing Technology and Characteristic Evaluation of Absorbent Cotton
Authors: Lin Jia Horng , Wu Zong Han , Lu Chao Tsang , Li Ting Ting , Lou Ching Wen
Published: August 2013

Hemostasis is the critical steps for trauma and emergency. When injured person is under circumstance of hemorrhage, the important step is immediate hemostasis because mild hemorrhage makes patient feeling pain and dizziness while abundant hemorrhage would lead to coma, shock even death. Therefore, hemostasis becomes an important rescue issue to bleeding patient. This study uses Polylactic acid (PLA) and Polyacrylate (HPA) to prepare PLA/HPA nonwoven fabric with different weight ratios of 100/0,95/5,90/10, 85/15, 80/20 wt%/wt%, following with discussions of tensile strength, tearing strength, softness, air permeability, water vapor transmittance, water absorption, water retention. The results show that, 80 wt%/20 wt% of PLA fiber and HPA fiber was the optimal blending ratio, and its water absorption, water retention and softness were respectively improved by 323 %, 245 % and 22.3 % by contrast with 100 wt%/0 wt% of PLA and HPA; but its tensile strength was decreased by 63 % even that still reaches the strength of absorbent cotton.
Research on Tourist Souvenirs Design Method Based on Gene Engineering
Authors: Zhao Xiao Tong , Jiang Chao , Chen Li Ling , Gao Jun Jie
Published: August 2013

Cultural gene pool provides necessary support for design platform which is based on the cultural gene. It is also the most basic part of gene engineering. Based on the tourist souvenirs, a new design methodpan-ethnic-group is put forward. Take tourist souvenirs actual project development of Hanyangling Museum as an example, Xi'an cultural gene pool has been built. Through pan-ethnic-group, cultural tourist souvenir sales were increased.
Production Processes Design Hybrid Depth Interview-Glutinous Rice Processors for Examples
Authors: Ho Zih Ping , Wu Yi En , Chen Jing Jung
Published: August 2013

Production process design hybrid real processors opinions is vital important. Many production processes design did not consider processors needs, resulting in many failure products. Glutinous rice industries have their own particularity of production process. Glutinous rice product is a product which is a raw glutinous rice material hybrid from food processing. In Chinese, Japanese, Indian, Korean, etc. societies, glutinous rice products are an important rice product and staple food. Glutinous rice product processors have to face variable raw material (glutinous rice) costs, hence, if they know the trend of glutinous rice products and products diversity, then this would easily gain better profits when they produce these glutinous rice products. This research tries to build a better production processes through processors depth interview, aiming at glutinous rice processors for examples. In this study, a profit formula was constructed. Through in depth interview survey, there were 12 processors in Taiwan visited during 2012. It showed that health, convenience and tourism factors potentially obtained the most profits when processors produced these glutinous rice products. These raw distribution data sets of glutinous rice processors costs would be a foundation of production process design references.
Congelation Risk Assessment of Oil Pipeline on Basis of Improved Monte-Carlo Method
Authors: Li Xian Li , Wang Yang , Su Wen Kun , Cheng Qing Lin
Published: August 2013

Congelation accident in pipeline of crude oil is always being a serious problem in china, which is mainly determined by the properties of domestic crude oil such as high content of wax, high pour point and viscosity. When oil pipeline operates at low throughput or shutdown, congelation accident always happen as the temperature of oil drops, which causes malignant accidents and significant financial losses. Using improved Monte-Carlo method of reliability theory, the failure possibility of congelation was numerically calculated. Whereas, the consequences of congelation accident were also fully analyzed, these can provide evidences for accident treatment, planned maintenance, security operation and scientific management.
The Research of Reverse Engineering Based on Geomagic Studio
Authors: Li Zhe , Xiang Hui Yu , Li Zhi Qiang , Han Bao An , Huang Jia Jun
Published: August 2013

The reverse engineering takes the products as prototype, through improving the CAD models to get new products models, which achieves the original design of product. The reverse engineering provides a convenient and fast tool for improvement design of the products,which is very important for shortening the development cycle and improving enterprise competitiveness. Therefore, it is necessary to research the reverse engineering. In this paper, the three-dimensional data scanner is used to measure the point cloud data of physical sample, by means of reverse engineering software Geomagic Studio to achieve the reverse modeling of parts and error detection analysis of digital model.
Optimize the Multi-Dimensional Test Coverage Based on Multiple Attribute Decision Making and Cross Entropy Method
Authors: Zhang Yi , Wang Gang , Lin Ping Rong
Published: August 2013

With the scale and complexity of software increasing, people's awareness of software quality assurance has gradually strengthened. How to carry out the test, test scheme optimization selection and how to improve the testing efficiency become the reality problems in software engineering. Using the test coverage of the multidimensional metric, the effectiveness of comprehensive test coverage, test coverage rate of satisfaction and test efficiency as the optimization test scheme selection, use of multiple attribute decision making lifting scheme selection algorithm to measure the optimal test program, ameliorate the severity of the past subjective experience dependent, so as to provide guidance for reasonable, effective and scientific test. The optimization of comprehensive test coverage scheme is applied to the Markov model of software testing; software testing with the average cost minimization as objective, using the cross entropy method the optimal coverage testing section to optimize the test process.
Genetic Algorithms Study in Switch Electrical Appliances Electric Arc Feature Extraction
Authors: Yu Jing Sheng , Li Li , Liu Ting
Published: August 2013

The genetic algorithm applied to switch electrical appliances electric arc feature extraction, based on genetic algorithm, the switch electrical arc feature extraction model was established. The initial pool formation, evaluation individual, reproduction, crossover and mutation have done a detailed representation. This model can eliminate the slow convergence and so easy to fall into the local minimum shortcomings of BP neural network computing graphics weights. The experiment showed that genetic algorithm can better converge to the global optimal solution, more in line with the arc Feature Extraction fact, and more effectively improving the quality of graphics extraction.
Numerical Research about Two-Phase Flow under Different Acceleration in SRM with Embedded Nozzle
Authors: Chen Xiong , Xue Hai Feng , Luo Yong
Published: August 2013

The complex gas-solid two-phase flow in a full-sized solid rocket motor with embedded nozzle under different acceleration condition was simulated with Euler-Lagrange model. Influences of different particle diameters and acceleration conditions on particle trajectories were analyzed. Simulation results show that the difference between gas flow field and two-phase flow field is significant. The particle accumulation zone above inner wall of chamber and nozzle is mainly concentrated in two regions. The accretion of the particle diameter will cause the following property worse, and the particles can easily form a highly-concentrated aggregation flow. With the increasing of axial-acceleration, the impact point in line2 will move backward in rear head.
Reliability Model for Complex Mechanical Component Design
Authors: Xie Li Yang , Qian Wen Xue , Wu Ning Xiang
Published: August 2013

Taking into account the uncertainty in material property and component quality, a complex mechanical component such as a gear should be treated as a series system instead of a component when evaluating its reliability, since there exist many sites of equal likelihood to fail. Besides, conventional system reliability model is not applicable to such a system because of the statistical dependence among the failures of the every element (damage site). The present paper presents a model to estimate complex mechanical component reliability by incorporating order statistic of element strength into load-strength interference analysis, which can deal with multiple failure mechanisms, reflect statistical dependence among element failure events and that among different failure modes.
Crashworthiness Optimization for a Two-Layered Front Rail Considering Front Oblique Impact
Authors: Hu Si Bo , Ding Yi , Bao Jing Ru , Hu Ping
Published: August 2013

This paper is concerned with the crashworthiness design of the front rail on a vehicle chassis frame structure considering uncertain crash directions. The front rail, as a typical thin-walled structure, is sensitive to the loading direction for crashworthiness requirements. Multi-step multi-domain optimization method was applied to obtain a new single-layered front rail (SFR) which has better adaptability to crash loading directions. To further improve the front rail crashworthiness, a two-layered front rail (TFR) is proposed. Response surface method is conducted to pursue the optimal thickness pair of the two-layered front rail. Numerical simulations are carried out with Altair/Hypermesh and LS-DYNA to compare the crashworthiness performances of the standard rectangle front rail, SFR and TFR. The results show that TFR keeps the same adaptability of loading directions as SFR meanwhile it can absorb more crash energy during front angle impacts.
Movement Function Reliability of Limit-Locking Mechanism of Space Cable-Strut Deployable Articulated Mast
Authors: Tan Zhong Qiang , Wang Shi Jiao , Zhao Ming Yan
Published: August 2013

The aim of the project is to study limit-locking mechanism of space cable-strut deployable articulated mast. Based on the discussion of structure and working principle, the mechanism's initial movement condition and self-locking angle are analyzed and a new analytical model of movement function reliability has been constructed. Combined with specific locking events, sliding pin's movement reliabilities are given in earlier and later stages. According to data from deployable mast, the reliability is calculated.
Structure and Development Trend of the Typical Aluminum Electrolytic Capacitor Casing Machine
Authors: Dai Cheng , Xia Bi Zhong , Liu Yi Ran , Ouyang Zhong Dong
Published: August 2013

Aluminum electrolytic capacitor (AEC) is a widely used capacitor. The casing machine plays an important role in the producing of AEC, and its performance affects the quality of capacitor. This paper introduces the working process and system structure of the typical aluminum electrolytic capacitor casing machine, and analyses some problems of the existing casing machines. Combined with these problems, the paper proposed its future development trends, which provides some references for the design of a new generation of casing machines.
Analysis and Design of MRF Elevator Traction Transmission Device
Authors: Zheng Xiang Pan , Chen Shu Mei
Published: August 2013

A magneto-rheological fluid (MRF) elevator traction transmission is a device to transmit torque by the shear force of MR fluid. The development and principle of MRF transmission device are presented. Then the design method of the MRF transmission is investigated theoretically. The model of the torque transmitted by the MR fluid within the brake is derived to provide the theoretical foundation in the MRF elevator traction transmission design of the brake. Based on this model, after mathematical manipulation, the calculations of the structure and width of the MRF elevator traction transmission are yielded.
Contact Mechanics in Cylindrical Clearance Revolute Joints
Authors: Pereira Candida , Ambrósio Jorge , Ramalho Amilcar
Published: August 2013

A comparative study concerning the dynamics of chain drives mechanisms is presented in this article. The study compares the dynamic response using the spherical contact model proposed by Lankarani and Nikravesh with a new enhanced cylindrical model developed by the authors to describe the contact phenomenon in cylindrical clearance revolute joints. In the process, the influence of contact parameters and the numerical efficiency of using different contact modeling approaches are evaluated. It is demonstrated that cylindrical contact is stiffer than spherical contact. The spherical model represents a rough approximation to evaluate the contact between cylindrical bodies since contact forces are underestimated.
A Comprehensive Study of Propulsion Torque Distribution for a Parallel Hydraulic Hybrid Heavy Bus
Authors: Zhang Zhong Liang , Chen Jie
Published: August 2013

The purpose of this paper is to improve the fuel economy of a parallel hydraulic hybrid heavy bus. And an optimal distribution strategy of the propulsion torque was proposed based on engine working points of the conventional bus. The universal characteristics map of the engine was divided into three zones by the optimal operating line and the fuel contour CBF. The results indicated this strategy can not only overcome the low energy density disadvantage of the accumulator but also prohibit frequent switching between the engine and the pump/motor. The HHP can provide most of the required torque and make most working points of the engine around or on the optimal operating line. When the value of the fuel contour CBF is 213g/kw.h, the bus has the minimal fuel consumption in the typical urban bus cycle and the fuel economy of the engine improves 24.8% compared to the conventional bus.
Study on Vehicle Hook Buffer Mechanism Based on Sequential Image Analysis
Authors: Li Rui , Xu Ping , Zhong Yuan Mu , Liu Long Xi
Published: August 2013

As the impact process of train energy absorbing components occurs in a short time, high-speed cameras are used to record it and the amount of deformation and energy change of the energy absorbing components can be obtained by analyzing sequential images. The method of sequential images analysis presented is based on feature recognition of mark points by template matching method. In addition to this, error introduced by the camera positions is corrected to obtain more exact results. During the process of collision, the amount of its deformation is 52mm and its energy change is 2.69KJ when using the sequential image analysis.
Plowing Performance Simulation and Analysis for Hybrid Electric Tractor
Authors: Li Hao , Song Zheng He , Xie Bin
Published: August 2013

According to plowing operation characteristics, a case study on a parallel HET (hybrid electric tractor) with the torque combinator is conducted to develop a plowing operation performance simulation system. The mathematical models of drive equilibrium, battery, power combinator and control system are established respectively. A simulation system for evaluating the tractive performance, fuel economy, battery characteristics and controller performance of HET is developed in the environment of MATLAB/Simulink. Simulation results suggest that: in this HET, the output torque and traction vary in a large range with the variations in the operation modes and SOC level of the battery; in the common interval of SOC (0.4~0.7), compared with the traditional tractor, HET can achieve larger output torque with a fuel consumption reduction of 18% ~20% in discharge mode; with the capability of keeping the battery charge-discharge stage stable and guaranteeing the SOC variation in a small range, the controller meets with the requirements of plowing operation and benefits the stability of the tractor power and the extension of battery life cycle.
Research on Manufacturing Process of Buried/Blind via in HDI Rigid-Flex Board
Authors: Su Xin Hong , Chen Yuan Ming , He Wei , Wang Shou Xu , Tao Zhi Hua
Published: August 2013

The trend towards portability of electronic products expands the application of rigid-flex board, which has become one of the hot spots in PCB industry. Along with the improvement of assembly technology, the improving design of rigid-flex board appears. High Density Interconnection (HDI) is one of the design directions. The key manufacturing parameters of buried /blind via process in manufacturing process of HDI rigid-flex board was studied in detail including material selections, laminate process, drilling process and via metallization. Better manufacturing parameters of buried /blind via were obtained through orthogonal design. It was found over 99.9% vias could pass the test on electrical performance.
Design Method Research on Green Modular that Oriented Remanufacturing Engineering
Authors: Yang Ji Rong , Liu Qi Yuan
Published: August 2013

In the green modular design method that oriented remanufacturing engineering, the equipment remanufacturing is taken as the design purpose, the modular design method as the basis, the green design and the modern mathematic method as the auxiliary means. In the beginning of remanufacturing, that is, before the birth of the entity life, the environmental attributes of the equipment and the reuse of the parts in the full life cycle are fully taken into account, and the green degree reflecting the environmental characteristics and the module degrees reflecting the functionality and usability features are evaluated and tested. The proposed design method can meet environmental attributes of the equipment and remanufacturing requirements at the same time, and it is satisfied with the fundamental purpose of remanufacturing.
Key Technologies Research on Section Display of Full 3D Gas-Assisted Injection Molding Simulation Results
Authors: Ren Qing Hai , Geng Tie
Published: August 2013

The section display technology of full-3D gas-assisted injection molding CAE results can describe the plastic melt filling and gas penetration inside the complex gas-assisted product. So, the key technologies of section display of "effective element" algorithm which is based on the pure space analytic geometry thought were introduced in detail. In the end, an instance was given.
A Measurement System for Si1-xGex/Si Multi-Quantum Wells Film
Authors: Zhang Jia Yin , Dong Tao , Wang Kai Ying , Su Yan , He Yong
Published: August 2013

Si1-xGex/Si multi-quantum wells (MQWs) film is excellent bolometer materials, which issensitive to radiation in the 8-14 micrometer wavelength region. As an important property,temperature coefficient of resistance (TCR) reflects the quality of infrared focal plane arrays.This paper designs a MQWs temperature and resistance data automatic measurement system basedon LABVIEW, and unifies data results, the characteristics of MQWs film was analyzed anddiscussed. The task is to examine the TCR for different material-compositions of MQWs.
Development of Experimental-Bed for Observation of Locomotory Small Animals
Authors: Zhang Xiao Dong , Li Jian Qiao , Zou Meng
Published: August 2013

The animal experimental is a fundamental equipment for biomechanics experimental, which attached to electric shock instrument, oxygen analyser or high speed recording system. The animal experimental has an advantage that it offers a single environment excluded the interfere from natural regimes. In this paper, a small animal observation experimental-bed was developed based on C++. The interface of control program was developed using Visual Basic 6.0 and the COM port communication between SCM LM3S8962 and PC was developed based on C++ Builder 6.0. The velocities of belt of the small animal experimental can run according to line, sinusoidal curves, triangular wave curves and square wave curves. Moreover, the control program provides a combined velocity based on above curves for satisfy the sophisticated experiment of locomotory small animals.
Design of Rail Vehicle Weighting System Using Pressure Sensor
Authors: Yoon Hyuk Jin
Published: August 2013

A mechanical system to detect the static wheel weight of the railway bogie using hydraulic pressure has been designed. Wheel weight can be acquired by a pressure sensor mounted on the hydraulic pressure distributor and displayed by a wheel load indicator with a resolution of 0.1 KN when the hydraulic pressure induced from the hydraulic hand pump lifts a wheel by mechanical components connected with the hydraulic pressure cylinder. The measurable wheel load is 100 KN. Also, a height indicator which is attached on the wheel using a magnet shows the elevated height of the wheel from the rail.
Energy-Based Approach for Controller Design of Overhead Cranes: A Comparative Study
Authors: Hoang Nguyen Quang , Lee Soon Geul
Published: August 2013

In this paper, five controllers including linear and nonlinear ones for an underactuated overhead crane are derived based on the passivity of the system. The total energy of the system and its square are used in Lyapunov candidate function to design controllers. The equilibrium point of the closed loop is proven to be asymptotically stable by the Lyapunov technique and LaSalle invariance theorem. In addition, the optimal linear controller is also combined to force the swing angle to converge fast to zero by reaching destination of the trolley. Numerical simulations are carried out to evaluate the controllers.
Terminal Sliding Mode Control for Wind Energy Conversion System Based on Constant Tip Speed Ratio
Authors: Yang Yong Ming , Li Ya Qiang , Feng Yong
Published: August 2013

In this paper, the terminal sliding mode (TSM) control technique is used to solve the solution sought for the maximum power point tracking (MPPT) of wind energy conversion system. In order to realize the control strategy, the wind energy conversion system (WECS) is regarded as a part of the constructed high order system. Based on the constant tip-speed ratio (TSR), selecting the appropriate state variables and treating rotational speed as the object researched, the control scheme for the MPPT of wind turbine can be achieved by using the terminal sliding mode control technique. The simulation carried out shows that the system tracking efficiency can be greatly improved and the power factor and tip speed ratio are very close to the optimal value in this solution.
A Fuzzy PID Controller in the System of BLDCM
Authors: Xu Li Fang , Han Yong Jie
Published: August 2013

Based on the basic characteristics of fuzzy control theory and the general PID controller, a fuzzy PID controller is proposed for brushless DC motor (Brushless Direct Current Motor-BLDCM) control.The output signal PD-type is used as the input signal of fuzzy controller.Fuzzy PID controller can be adaptively adjust the PID control parameters to achieve operational control of BLDCM control system. Simulation results show that, compared with the general PID controller, fuzzy PID controller shows better characteristics on the respects of dynamic response overshoot and stability regulation time.
An Underwater Driving Mechanism Moved inside
Authors: Chen Yong Hua , Li Si Ren , Gong De Jun
Published: August 2013

A variety of driving mechanisms are used on a large amount of equipment working underwater, and the driving mechanisms mostly rely on motor to work. But the seal of the motor working underwater is a thorny problem, especially in deep sea. Thus we propose a new concept of underwater drive mechanism. In the device, the motor and the shaft are sealed up overall by a watertight house. The rotation of the inside motor makes the whole sealed device to rotate through the internal toothed gears, which makes it true that the motor shaft realizes driving function by static seal. And this increases the reliability of the seal, eliminates the friction of motor shaft, and improves the mechanical efficiency. This paper introduces the building of this new underwater driving mechanism, and carries on the comprehensive analysis and its working performance to lay the foundation for its application.
Mass Station Technique Based on Further Development of Pro/Engineer
Authors: Huo Lin , Ge Jian Quan , Feng Zhi Wei
Published: August 2013

In view of the problem that an assembly can not be cut out directly in Pro/Engineer, further development in asynchronous mode of Pro/Engineer is applied by using Visual Studio 2010 development environment and Pro/TOOLKIT development module of Pro/Engineer. The transformation matrixes of every part and sub-assembly are calculated with traversal method. Every part belonging to the imported assembly is cut out at appointed position input by users, and the mass property of the remainder is calculated by adding it up in order to replace the function to cut out the whole assembly and to get the mass property of the stations. Two virtual model is employed to demonstrate the accuracy and practicability of the mass station calculating application. The result is very encouraging and the calculating efficiency is markedly improved.
A Power Management System for Thermoelectric Generators Used on Spindle Units of Machine Tools
Authors: Zeng Qing Hui , Li Sheng , Yao Xin Hua , Fu Jian Zhong
Published: August 2013

Thermoelectric energy harvesting is emerging as a promising alternative energy source for drive wireless sensors in mechanical structure monitoring. Typically, the waste heat from spindle units of machine tools creates obvious potential for thermoelectric generation. However, the problem of power gap between the power level needed by wireless sensor and what thermoelectric generators (TEGs) can provide is likely to arise in the application of thermoelectric generation. Therefore, a power management system (PMS) is needed to accumulate TEG energy first and then drive the load intermittently. This study proposes a power management system to enhance the energy harvesting and usage efficiency using three capacitors. A rotating spindle platform is set up to test the PMS, and the experimental result shows that the proposed PMS worked well when the spindle speed is 3000 rpm.
Research on the Impact of Temperature on the Softening Point of SBS Modified Asphalt
Authors: Feng Xiao Wei , Zhang De Wen
Published: August 2013

The softening point of modified asphalt is an extremely important indicator to evaluate the high-temperature performance; its the temperature of modified asphalt sample emerging shear deformation under the action of certain shear stress according to the specific heating rate. Its found that in the actual construction and testing, different temperature conditions has a larger impact on the softening point of the modified asphalt, which has adverse affect on road construction. This paper studied and researched the influence of temperature on modified asphalt softening point indicators from the different test temperature, including packing compact temperature, scraper temperature in removal of asphalt that above test mode, standing temperature, curing temperature and initial heating temperature before test.
Design Maps and Shape Optimization of a Prototype Vehicle Chassis
Authors: Murshed Muhammad Ridwan , Ud Duja Badar , Ranganathan Shivakumar I. , Darras Basil M.
Published: August 2013

This paper focuses on optimizing the design of an eco-car chassis cross-section. This is done by constructing design maps and by carrying out a parametric study on the relative stiffness and mass of three different cross-sections: round-tubular, square-tubular and I-section. The objective is to determine the section that yields the desired safety factor while maintaining the lowest possible mass. An iterative approach is employed and the safety of the final design is verified both numerically and experimentally.
Research and Implementation of Single Switch Voltage Clamped Hybrid DC-DC Converter
Authors: Chao Zhang , Qiang Zhou , Lei Xu , Ning He Xiang
Published: August 2013

Recently, micro-inverter has received great attention due to its excellent performance under local shade condition. However, this kind of inverter needs large DC-DC voltage gain to implement grid-connected power generation for single photovoltaic module. This paper presented a new single switch high voltage gain DC-DC converter, which is consist of a double output voltage Boost converter and a flyback converter. The outputs of both converters are connected in series to supply power for the load, so the proposed converter has high voltage gain. Moreover, the input circuit is shared by the boost converter and the flyback converter in this new converter, which facilitates the converter structure and improves the converter efficiency by recycling the transformer leakage energy. The double output voltage boost converter can reduce the turn ratio of the flyback transformer and it can decrease the leakage inductance of transformer and diode voltage stress. In addition, the clamp capacitor can limit the power device voltage stress and simplify the circuit design. The paper analysis the operation process of presented converter and gives the detailed deduction of relevant formula to guide the converter design. Experimental results verify the presented converter.
A Practical Design Method of Flyback Switching Power Supply Transformer
Authors: Zhou Dang Pei , Chen Ye Xian
Published: August 2013

A practical design method of flyback switching power supply transformer was presented to solve the problem involved in too many formula and parameters calculation . This method explained the physics meanings of each parameter of the flyback transformer clear and concise, and gave the calculation methods and procedures of them based on practical engineering experience. An experimental result compared with the result designed by the software PI Expert 8 showed that the presented method was valid and more flexible.
Design of FPGA Debugging Interface Based on EZ-USB Slave FIFO
Authors: Li Ling
Published: August 2013

The USB which has high-speed streaming data and can plug and play meets the requirement of the data transfer mission. CY7C68013 have an ingenious architecture and can automatically deal with most data communication in USB 2.0 specifications. A high speed streaming data system based on EZ-USB FX2 was designed. The debugging interface based on slave FIFO of EZ-USB FX2 can send data in bulk from FPDA to upper computer; its convenient to system debugging work.