bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Influence of Tension and Compressive Fatigue Load on the Corrosion Coefficient of Parking on the Ground
Authors: Yang Xiao Hua , Liu Xue Jun , Zhang Tai Feng , Xin Zhi Dong
Published: March 2015

To ascertain the grounding corrosion coefficient parking on the ground is the key to evaluate the airframe calendar life. The influence of pull and press load on the grounding corrosion coefficient was evaluated in this paper. The main results are as follows. First, the fatigue life always follows the logarithmic normal distribution after pre-corrosion for pull fatigue loading and press fatigue loading. But the scatter of fatigue life for the wing down-panels is reduced with the fatigue life, and the scatter of fatigue life for the wing up-panels is not changed. The second, the coefficient of the wing up-panels test sample is not changed with the increase of the corrosion calendar life. But, the coefficient of the wing down-panels test sample descends with the increase of the corrosion calendar life.
Performance Study for T-Stub Considering the Bending Capacity of Bolt
Authors: Chen Shi Zhe , Wang Zhan , Zhou Chao
Published: March 2015

The bending capacity of the beam end-plate or the column flange and the tensile property of the bolt could be expressed by an equivalent t-stub model. In this paper, ten groups of different sizes of T-stub are designed for monotonic loading test. The accurate element models are established for comparable study with the experimental result. The stress distribution and deformation characteristics of the T-stub and bolts are determined. A theoretic formula of tensile stiffness for T-stub is derived, it is presented that the calculation results are consistent with the tests.
Optimal Design of Runner for Shell of Mobile Telephone Based on Moldflow Software
Authors: Sun Guo Gong , Liu Chang Hua , Li Qiang
Published: March 2015

The runner balance of upper cover and back cover of mobile telephone was optimized in view of the runner imbalance of different mould multi-cavity in the design of plastic injection mold by means of Moldflow software. The results that the fill time of the back cover of mobile telephone is 0.8858s, that of the upper cover of mobile telephone is 0.8588s, the imbalance rate is 3.1%. The optimized runner size is φ3.739mma and φ1.666mm while the runner size is φ3mm before optimization. The gate location of V/P switch point is 29.85Mpa and is close to the target pressure 30Mpa, the pressure in the distribution is uniform.
Applicability of Virtual Reality in the Study of Environmental Stress
Authors: Feng Xin Xin , Zhao Jia Bao , Cui Rong Zhen
Published: March 2015

People’s behavior in the fire circumstances of the high-rise building is a typical study instance of environmental stresses. We replicated this scene in our virtual environment using Unity 3D. The technology creates a virtual environment by combining 3D modeling technology, computer graphics, wide-angle stereo display and a series of hardware and software technologies. The project built a high-rise building fire escape system which providing a highly immersive virtual environment and giving participants a more realistic experience. Virtual reality was used to simulate the fire scene, and data of how people reacted was collected to analyze the credibility and effectiveness of virtual environment on studying environmental stresses.
The Computer Room Modeling and Data Display Based on Three Dimensional Visualization
Authors: Luo Gong Yin , Guan Kang Ling , Liao De Yong , Yang Shan , Zhuang Yu Lin
Published: March 2015

This paper introduces the communication room modeling and data display method based on 3D visualization technology, proposes the overall architecture and function architecture of the Three Dimensional Visualization communication room, and depicts the panoramic display of 3D computer operation monitoring from four aspects such as 3D monitoring visualization, 3D assets visualization, 3D wiring visualization and 3D statistical visualization.
Verification and Validation for Model-Based Design
Authors: Chen Zi Wei , Hou Zhi Min
Published: March 2015

As designs become larger, more complicated and more deliberate, it is necessary to describe a design at a high level (i.e. Model-Based Design), enabling the designer to run simulations faster and identify bugs early on. These demands drive an even greater need for tools and practices that enable automation and rigor in the area of verification and validation. In this paper we discussed verification and validation used for Model-Based Design. Besides, a whole tool of verification and validation from Matlab/Simulink, and a recommended procedure for model validation was also given.
Rapid Research and Design Parameterization of Outdoor Double Intelligent Cabinet
Authors: Li Yu Wen , Zhou Mei Juan , Zhou Gan
Published: March 2015

It is inevitable requirement of modern engineering rapid design for outdoor double intelligence cabinet.Taking VB as the tool,rapid parameter module of geometric parameters and boundary conditions of double intelligent cabinet was designed，the exhaust air of fan as adjustable object,then Fluent software for numerical simulation of temperature was called quickly ,using VB to display Fluent calculation results,the rapid parameter module can timely show the significant influence of exhaust air to the inside temperature.It has important guiding significance to practical engineering.
Dynamic Studies on the Recurve Bow
Authors: Zhou Ji He , Shi Yu Qin
Published: March 2015

By utilizing the acceleration sensor and the strain gauge, the non electrical quantity measurement technology, we collected the data of the dynamic strain process in the actual shooting circumstances of athletes and get the data through the computer; exploratory proposed the dynamic characteristics of the bow.
Research on the Harris Algorithm of Feature Extraction for Moving Targets in the Video
Authors: Yan Jun , Piao Yan
Published: March 2015

This paper studies a problem which is the rapid acquisition feature information of moving targets in a video sequence. Selecting the harris algorithm as a feature extraction algorithm, but harris algorithm has a problem of running slowly .Opting 3 * 3 window as the detection window, analyzing the similarity between the window capacity pixel and central pixel, then using the difference to measure this similarity of pixels, when the difference is greater than the set threshold value, we thought they are different, otherwise they are similar.After that characteristics of regional screening was completed. The target areas were divided into feature areas and non-feature regions, but we only calculated the response functions of characteristic areas. The algorithm’s executing efficiency improved.
Green Manufacturing Environment of Straw Packaging Container Extrusion Mechanism Design
Authors: Zhou Wei , Zhou Yi , Hua Jun
Published: March 2015

According to the sustainable development of green packaging design, research and application of green manufacturing technology and process of plant straw packaging extrusion mechanism design. Based on the straw packaging container material formulation and molding process, the analysis of the forming mechanism of plant straw packaging container. Key components of straw packaging container extruder extrusion mechanism carry on the design. The key component of extrusion mechanism of CAM profile design, to reduce the impact vibration as the goal, set up the CAM squeezing the motion analysis of the process, all parts of the CAM profile equation is given.
Analysis of Thermal Effect on Elastohydrodynamic Lubrication in Angular Contact Ball Bearing
Authors: Wang Bao Ming , Yun Xia Lun , Liao Xing Yao , Mei Xue Song
Published: March 2015

Based on the theory of point contact thermal elastohydrodynamic lubrication (EHL),the mathematical models for the thermal EHL of high-speed angular contact ball bearing are established. Multi-grid method and multigrid integration method are respectively used to calculate out the film pressure and film thickness respectively,and the column-by-column scanning method is used to calculate temperature rise of isothermal EHL and thermal EHL. The calculation results show that, under the pure rolling condition, temperature rise of oil film temperature is mainly caused by the compression work and shear heat at inlet and the heat in contact zone mainly comes from the inlet and the heat conduction around; the temperature rise results in oil viscosity lower and the lubricating film thinner ,in this way it reduces the lubrication performance in contact pair.
Optimization Research of the Developing Machine Structure Based on Fluent
Authors: Xu Hong Wei , Xu Yang , Yao Guo Wei , Nie Zhao
Published: March 2015

Because of good and fine printing quality, screen printing is very common technology in printing and dyeing factory recently. Developing is important to insure the screen printing quality. In this paper, a developer structure is designed and studied. Fluent software is used to analyze the developing process. In this way, the numerical model of nozzle is founded. The jet flow fields of different structure fan-type nozzles are analyzed and compared. Depended on the simulation results, the right nozzle is chosen and used in the developer structure, and the structure of developer is modified to fit the cleaning quality required. The experiment of new structure developer with the chosen nozzle is done, and the experiment result shows better cleaning quality with the new developer and new nozzle.
Kinematic Analysis of Swash Plate Axial Piston Pump Based on Adams Simulation
Authors: Deng Hong Chuan , Zhang Yu , Qian Hai Sheng
Published: March 2015

The swash plate axial piston pump is a main part in liquid press system.It is a positive displacement pump which rely on the change of the plunger cavity content to realize oil absorption or discharge of oil by the reciprocating movement of the plunger in the plunger cavity. Plunger, the slippery boots, oil pan, cylinder body are important parts of the swash plate axial piston pump. Sliding boots is one of commonly used by high-pressure plunger pump form, it can meet the needs of the high pressure high speed;the oil distribution plate and cylinder directly affect of the pump efficiency and life span[1]. Because the swash plate axial piston pump has the advantages of compact structure, fewer parts, good manufacture ability, low cost, small volume, light weight, than the radial pump has the advantages of simple structure, easy to realize step less variable and convenient maintenance, it has been widely used in the industrial production.
Numerical Simulation on the Temperature Characteristics of Indirect Air Cooling System
Authors: Qiu Xiao Zhi , Zhao Yan Ming , Huang Bao Hua , Xu Wei
Published: March 2015

Based on the analysis of indirect air cooling system, a numerical simulation model of indirect air cooling system was constructed by ANSYS software. According to the different wind speed condition, the temperature characteristic of indirect air cooling system was analyzed. The simulation results show that with the increase of wind speed, the ventilation and heat release of the indirect air cooling system change greatly. It provides a theoretical basis for the design of the wind-proof device of indirect air cooling system.
Research on Steering Safety Strategy of Electric Forklift
Authors: Zhang Chao , Xiao Ben Xian
Published: March 2015

A detailed discussion about lateral stability and longitudinal stability of electric forklift had been done. Besides, this thesis introduced the control requirements of the lateral stability firstly, and then calculated the max safe steering speed on the critical overturning state secondly, and then gave the relationship between the safe steering speed, the steering torque, the load of the forklift and the steering real-time speed. Finally, the optimized factor and the optimized slope were determined based on fuzzy control theory to gain the expression which can optimize the speed.
Study on the Large Range Torque Transmitter Quickly Assembled Used for the Calibration of Hydraulic Tongs
Authors: Yang Xiang Tong , Zhang Fu Xiang , Yu Xiao , Yu Yang , Dou Yi Hua
Published: March 2015

For oil field, Square surface connection embedded in our torque transmitter are designed to connect 2 torsion rods instead of flanges, which can shorten the radial dimension of the large range torque transmitter, and realizes the rapid assembly in oil field. It is the chemical composition of elastomer that determines the mechanical properties of the elastomer; the paste process of strain gages will affect the parameters of the torque transmitter, such as linearity, measurement accuracy, hysteresis, repeatability etc.
Decision and Optimization for Preventive Replacement Contents of Ship Equipment with Multistate System
Authors: Liu Jia , Lv Jian Wei , Yan Jing Bo
Published: March 2015

To scientifically analyze the preventive replacement contents of ship equipment with multiple performance states during sea service, this paper builds a Pareto optimality model for replacement contents based on mission reliability, replacement time and replacement cost, brings forward a heuristic algorithm to constantly eliminate non-inferior solution and impossible solution, and presents a case analysis to verify accuracy of model and operability of algorithm.
Design of a Locomotion Control System for Live Working Robot
Authors: Liu Cun Gen , Lu Shou Yin , Liu Yuan , Zhang Ying
Published: March 2015

Live working robot is developed for live working, and it can instead of operators completing the corresponding action and tasks real-time and accurately. For Kraft hydraulic live working robot, this paper designed a motion control system based on TRIO464. This control system can realize the movement of each joint and has advantages of high positioning precision, fast response time, safe and reliable performance, multiple safety protection measures.
Path-Planning of Laser Quenching of 5-Axis Laser Machine Tool
Authors: Xu Hong Wei , Yu Hua Long , Li Min Juan , Wang Ju
Published: March 2015

This paper presents a path-planning method of laser tool in 5-axis laser quenching for complicated surface. In this method, two main factors are concerned which include: (1) Planning the CC paths on the complicated surface quenched to maintaining laser tool scanning speed constant easily in quenching process; (2) Diminishing the chord deviation between the actual value and its approximation by choosing different interpolation methods according to the curvature radius of CC points which is being quenched. This method effectively ensures the part’s laser quenching quality.
Plate Cutting NC Machining Simulation System Based on OpenGL
Authors: Xia Lei , Han Qing Jiang
Published: March 2015

IIn the plate cutting NC machining field, aiming at how to choose processing method, determine the processing trajectory and other issues, a simulation method was proposed for auxiliary processing production process using computer, in order to achieve in the short time to find the optimum processing path and complete the check NC code. On this issue, based on the 3D simulation system based on OpenGL, the simulation with NC graphics NC code to check the set in one, the full realization of the virtual machining a sheet, greatly improving the efficiency of the plate processing.
The Designation of a New Kind of Green Streetcar Based on Virtual Tracks and Key Technologies
Authors: Han Peng , Zhang Wei Hua
Published: March 2015

As the development of urbanization and economy, the traffic stresses in most urban cities in China have many severe challenges that need solving in the process. The idea of a new kind of streetcar based on virtual tracks which owns a series of advantages including suitable speed, big capacity, low construction cost and environmentally friendly is proposed. The designation of the streetcar is moving around the aim of a capacity of 15 thousand persons per hour with the operation speed of 40~50km/h. The key technologies are consists of the identification and navigation of the virtual tracks, differential steering theory, vehicle system dynamics, suspension system, precise control of wheel hub motor and the right of way rules (ROW). This article describes technical principles of each key technology and their latest development in the progress of the green streetcar based on virtual tracks.
The Optimization of Costs of Supply Chain Network
Authors: Dai Zhuo
Published: March 2015

This research proposes a muti-echelon supply chain network design model. The model includes raw material suppliers, manufacturers, distribution centers, and customer zones. The purpose of this research is to minimize the total costs of supply chain network. The total costs include transportation cost, fixed cost, variable cost, penalty cost. This model is a mixed integer linear programming model. In general, it is very difficult to solve the model. In order to solve the model, Cplex12.6 is used. The results show that this model can be solved by this mathematical programming software well.
The Application of Genetic Algorithm in Valve Spring Optimization Design of Internal Combustion Engine
Authors: Wang Shao Ni
Published: March 2015

This paper described examples of genetic algorithm in valve spring optimization design of internal combustion engine, which solve the optimal values of the design variables by constructing multi-objective function. The technical problems that complex performance can't be considered in the calculation were solved in designing the spring, the method has many advantages such as simple universal, strong robustness, and wide application range; it is an essential and critical intelligent computing technology in the future mechanical optimization design.
Applying Form Elements Extracted from Brand Mark Design to Auto Body Design
Authors: Li Jian
Published: March 2015

Based on auto brand image system theory, the paper analyzes the image modeling function of brand mark, discusses the relation between brand mark form and body form , clarifies the meaning and purposes of applying the form elements extracted from brand mark design to auto body design and proposes the methods of extraction and application principles.
Rules for Problem Solving: Qualitative Analysis and Compilation of Existing Inventive Heuristics of TRIZ
Authors: Tessari R.K. , de Carvalho M.A.
Published: March 2015

Heuristics are widely accepted and used as tools for inventive problem solving. A problem when using heuristics is that their number is relatively high and ever growing (469 heuristics were analyzed only in this research). This amount of heuristics makes it necessary for problem solvers to spend a significant amount of time in understanding them, finding the most suitable ones to their specific situations and using them. This article presents a first step towards decreasing this complexity. The main heuristics to solve inventive problems were synthesized into a single list, whose preparation involved the identification of heuristics in literature, followed by a qualitative analysis through a comparison process, resulting in a final list of 263 heuristics. The authors hope that this list can save problem solvers’ time and become a basis for a future, essential set of inventive problem solving heuristics.
Detecting Drivers’ Stress in Emergency Using Physiological Sensors
Authors: Chen Ying
Published: March 2015

This paper presented methods for collecting and analyzing heart rate data during virtual-world driving task in emergency to distinguish and assess a driver’s stress state. The primer study had developed the driver stress training system loaded on driving simulator to display 14 typical emergency scenarios in different road environment. Electrocardiogram was recorded continuously by Physiological Sensors while drivers followed a random simulated driving on the driving simulator. Data from 30 drivers of at least 10 times per scenario were collected for analysis. The data were analyzed in two ways of HRV (Heart Rate Variability) analysis. Analysis I used time domain indexes of data during the driving in the whole training to distinguish the stress occur during the time frame of the scenario with an accuracy of over 98% across multiple drivers and driving days. Analysis II compared frequency indexes of data in stress state in emergency and in clam, with a metric of observable stressors created by the scenarios. The results showed that heart rate metrics is most closely correlated with driver stress level for most drivers studied. These findings confirmed that heart rate signals can provide a metric of driver stress in future cars capable of physiological monitoring. Such measurement could be used to help manage non-critical and critical in-vehicle information systems and could also provide a continuous measure of how different road and traffic conditions affect drivers. Physiological sensors can be used in driving assistance system in future.
Characterization of a Smartphone’s CMOS Image Sensor Response to Radiation
Authors: Xu Chao Qun , Jiang Jie , Ouyang Zhi Yuan , Qiu Chuang He
Published: March 2015

As part of studies into the use of Smartphones as solar-radiation monitors, this article characterizes the violet response of a consumer complementary metal oxide semiconductor (CMOS)-based Smartphone image sensor in a controlled laboratory environment, with an adjustable Lamp as a radiation source, a band-pass filter (central wavelength is 400nm) covered on Smartphone camera lens and a ASD spectrometer observing synchronously. It is found that a logarithmic relationship appears between CMOS-based sensor imaging DN values and irradiance, and the red (R) component in the chromo-photograph is linearly relative to irradiance. In addition, a Smartphone can be used as a convenient and low-cost scientific instrument in the field of monitoring radiation characterization, due to its capacity to detect usable irradiances.
The Power Cable Online Monitor and Posit No-Blind Area
Authors: Jiang Guo Yi , Zhang Hai Quan , Liu Hai Bo
Published: March 2015

The power cable online can solve the problem ,which is long distances producing positing no-blind area within 1 km. Background processing software handle the second test ,analyze line faults, and monitor the no blind area with a the algorithm of OTDR--which automatically determines the length--and intelligent selection parameters.
An Object Tracking Method Based on Illumination Compensation
Authors: Yang Da Wei , Qi Yan , Liu Li Ping
Published: March 2015

Aiming at the illumination change and partial occlusion in the object tracking, an object tracking method based on illumination compensation was proposed. An illumination compensation method based on Retinex was applied to the sequence images, a structural appearance model and template matching were used to track the object. Dense sampling was used to obtain candidates, extended least median square was used to match templates, and a step by step template updating method is applied. The experimental results demonstrate the effect of the proposed method.
A Dual-Wavelength Temperature Sensor Based on Fiber Optic Delay
Authors: Yang Ning , Qiu Qi , Su Jun
Published: March 2015

In this paper, we report a dual-wavelength temperature sensor based on fiber optic delay. This temperature sensor don’t need to rely on accurate spectrum measurement, but to realize temperature measurement by detecting the variation of delay, which can efficiently reduce the cost and complexity of sensor system. In this dual-wavelength system, one wavelength of light is used as a reference and the other one is used for temperature sensing, so this design can effectively eliminate the negative influences of unstable external environment. The principle of this temperature sensor is theoretically derived, the schematic of sensor system is analyzed and the feasibility of this method is tested in the temperature range of 0°C-80°C. Results indicate that, this temperature sensor is able to achieve temperature measurement in a simple way with low cost.
Study on Temperature’s Character of Eddy Current Sensor
Authors: Tao Yu , Zhang Zhi Feng , Zhai Yu Sheng , Su Yu Ling , Liu Hai Zeng
Published: March 2015

The eddy current sensor can be used to measure the displacement. It is widely used in petrifaction, electric power, mechanism. The eddy current sensor has fast dynamic response, non-contact measurement, and better adaptability characters. The accuracy of eddy current sensor often is influenced by the environment temperature. The environment temperature effect is analyzed and put forward to a method to compensate to enhance the accuracy.
The Temperature and Pressure Information Fusion Based on BP Network
Authors: Li Guo Yu , Wang Zhi Hui , Yang Kang , Jia Su Mei , Li Yan
Published: March 2015

The output of pressure sensor is affected by non-objection parameters in its application, its defect is the sensitivity to temperature. The method of the data fusion from the two sensors based on BP network can eliminate the side effect of temperatures and improve the accuracy and reliability for the pressure sensors. This method based on Levenberg-Marquardt algorithm of BP network has not only a simple network structure, but also a quick learning rate, showing a better prospect.
Data Mining Algorithm and its Application with Massive Text Database
Authors: Wang Chun Ping
Published: March 2015

Features of large text data mining methods method is avoided semantic analysis from the lexical, syntactic, but by means of statistical analysis and processing large text data, thus maximizing literally ignored similar semantic differences, adapt to network language characteristics. The results of our paper show that data mining algorithms may extract the information in this article can portray the characteristics of vocabulary specific user characteristics and make recommendations based on the characteristics of the user vocabulary.
The Research of Maglev Gyroscope Data Characteristics Based on Two Positioning
Authors: Shi Zhen , Ma Ji , Yang Zhi Qiang
Published: March 2015

Through the analysis of two-position sampling data based on the maglev gyroscope north seeking theoretical model and the verification of north seeking experiments results via several aspects, it was found that there were systematic deviations between the maglev gyroscope north seeking process and the theoretical model. It’s mainly reflected in the deviation of the trend term deviation and constant deviation related to the north seeking erection orientation. They don’t impact the stability of north seeking according to our analysis. The constant deviation impact the absolute north seeking accuracy, but it can be offset by data differential. Finally, the author believe that the maglev gyroscope north seeking data characteristics can be used as priori conditions of data filtering and elimination of gross error. It can also be used in the assessing precision of the gyroscope orientation.
Sparse Lp-Norm Based ICP for 3D Registration
Authors: Li Xiu Zhi , Qin Bao Ling , Qiu Huan , Jia Song Min
Published: March 2015

In order to uncover truths to serve justice, case-related data collected from a digital investigation requires substantial resources to analyze, especially in time-critical situations. At present, however, digital forensics has not evolved to meet this ever-increasing demand. Digital forensic triage is a promising solution, as it is designed to maximize the use of resources according to a system of priorities, and hence the efficiency and effectiveness of forensic examinations can be increased. Nevertheless, the lack of concrete methods limits efforts to implement triage. This paper presents a practical approach that is designed to build a prioritizing solution. In this work a newprocess model is derived based on the presented approach, and it is particularly suited to scenarios where forensic examiners do not have enough time and resources to conduct a full examination and analysis. An example is described to demonstrate how this approach can be used to meet the requirements of network forensic investigations.
Refractive-Index Sensor Based on Metal-Insulator-Metal Waveguides
Authors: Tang Ting Ting , Luo Li
Published: March 2015

We propose a refractive sensor based on directional coupling between two metal-insulator-metal (MIM) waveguides to measure the refractive index change of the insulator, which is designed to be with a structure of metal-insulator-metal-insulator-metal (MIMIM) in which surface plasmon waves (SPW) are excited. The propagation properties are analyzed by coupled mode theory, and the expressions about the coupling coefficient, coupling length and sensitivity are derived. The sensing properties based on simulation results are also discussed. Compared with a dielectric waveguide, the total size of our sensor with MIMIM waveguide is about one tenth that with dielectric materials, while the sensitivity is improved ten times larger than the former.
Preliminary Electromagnetic Design Expert System for Surface-Mounted Permanent Magnet Brushless Machine
Authors: Zhang Hang , Zhang Yue Jin
Published: March 2015

An accurate and fast flowchart of surface-mounted permanent magnet brushless machine (SPMBM) design based on exact analytical method (EAM) rivaling finite element method (FEM) is formally proposed in this paper. It is recognized as a promising expert system for the preliminary electromagnetic design of SPMBM, even to replace the conventional design flowchart using equivalent magnetic circuit method (EMCM). By applying this expert system aiming at the low cogging torque and high power density, a special SPMBM named electronically commutated permanent magnet synchronous DC machine (PMSDCM) with conventional DC armature winding is put forward and verified based on both the simulation and experiment.
The Study on After-Treatment System and Algorithm of Piezoelectric Micromachined Modal Gyroscope
Authors: Li Yang , Wu Xiao Sheng , Zhang Wei Ping , Chen Wen Yuan
Published: March 2015

Piezoelectric Solid-State Micro-machined Modal Gyroscope is a new kind of gyroscope sensor based on MEMS. According to the characteristics of the gyroscope signal, the after-treatment processing system is designed and implemented, including A/D convertor by AD7656 and data storage by SD card. After applying Kalman filter to the digital signal on DSP, 71.8% decrease of standard variance of initial signal is achieved remarkably, which lays the foundation for the practical application of piezoelectric micro-machined modal gyroscope.
An Accurate Mathematic Model for PMSM by Taking Total Losses and Saturation into Account
Authors: Qiao Feng , Liu Zhi Zhen
Published: March 2015

An accurate mathematic model of permanent magnet synchronous motor (PMSM) is necessary for precise torque control and/or high efficiency drive control. This paper discusses the development model of PMSM by taking all losses and saturation into account. In the proposed model, all losses composing of the copper loss, core loss, mechanical loss and stray loss were analyzed to improve the torque equation. In addition, considering the influence of saturation level, the variations of the core loss resistance, direct-quadrature axis magnetic inductance and permanent magnet flux were discussed on support of the data analyzed by Ansoft. In order to verify the developed model, a start up simulation is performed in the mode of open-loop and the results confirm the validity of the model.
Anti-Windup Variable Parameter PD Controller Design for Ballistic Missile
Authors: Song Fei , Zhao Hong Chao , Mei Ying Xin
Published: March 2015

The conventional PD controller could cause the saturation problem of ballistic missile actuators. A design method of anti-windup variable parameter PD controller was proposed. The proportional coefficient and derivative coefficient were designed to be Gauss functions of system tracking error. Both were small when tracking error was big; whereas both increased as the tracking error decreased. This method not only restrained effectively the saturation problem, but also produced enough control force to drive system outputs to track their commands speedily. The control effect of anti-windup variable parameter PD controller was compared with that of the conventional PD controller in the numerical simulation. The simulation results show that the anti-windup variable parameter PD controller has better control effect.
Study on Optimization of Control Parameters for the Second Cycle during Forward Rotation Direct-Start Process at a GDI Engine
Authors: Sun Wen Xu , Hong Wei , Xie Fang Xi , Su Yan
Published: March 2015

To get better starting performance for GDI engine forward rotation direct-starting without starter, the optimized choices of fuel injection and ignition control parameters under different initial start conditions was carried out in a wall-guided GDI engine. The results showed that the ignition timing and injection timing have been less affected by the initial start conditions. When the ignition timing is kept near its compression TDC and the injection timing is kept within the scope of 2-10 °CA after the crankshaft rotation, the engine all can get higher rotation speed under different initial start conditions. When the fuel pressures and cooling water temperature are lower, the richer mixture was needed for obtaining higher rotation speed.
Synchronization of a Class of Uncertrain Time-Delay Chaotic Systems
Authors: Chen Hua , Ji Yue Jiang
Published: March 2015

Synchronization of a class of time-delay chaotic systems with parameters perturbation is discussed in this paper. The knowledge of the delay time is unknown. Firstly, we design a newresponse chaotic system , then based on Lyapunov-Krasovskii function, we show that the responsechaotic system can synchronize the driven system. The proposed method is tested and verified byan numerical example.
Research on the Key Technologies for Establishing the Finite Element Model of a Gyro-Stabilized Platform
Authors: Yang Xiu Li , Qin Lin Jing , Huang Feng Xiao , Guo Wen Jing
Published: March 2015

The gyro-stabilized platform is one of the key parts of a guidance weapon. The structure performance of a platform influences the accuracy and reliability of the guidance weapon straightly. In order to reduce development cost and time, the structural modeling and analysis of gyro stabilized platform is very necessary. UG software is applied to establish the three-dimensional model of a platform firstly. And then some components are simplified using MSC Patron. According to the different connection mode between the components, some appropriate connecting elements are applied to establish the finite element model of the platform. In order to meet the special requirements of individual components, appropriate materials are selected so that the finite element model is closer to the actual situation which ensures the reliability of mode analysis and optimized computing results. The work in this paper provides reference for establishment of the similar structure finite element models.
The Characteristics of Frustum of Cone Parachute-Airbag for Aircraft Recovery System
Authors: Xie Wei Hao , Zhou Bin , Liu En Xiao , Zhang Yuan Geng
Published: March 2015

The aircraft recovery systems have been drawn more attention for its ability on offering cushioning landing in recent years. However, many previous researches mainly focus on the cylinder or rectangle air bags where the upper surface is orthogonal to the flank side. This kind of airbag will not meet the requisite stability and security because it might be bended by payload under the misalignment forces. In this light, a more stable frustum of cone parachute-airbag system is proposed and the cushioning mathematical model is established. Based on the theories of thermodynamics and mechanics, the expressions of velocity and deceleration are derived. The effects of initial parameters on airbag cushioning properties are analyzed and the simulation results are shown. The results can provide references for the future design of aircraft recovery system.
Research of Three Anti-Lock Braking Control Algorithms to Enhance the Effect of Vehicle Directional Stability
Authors: Li Jing , Yang Xiong , Wang Zi Han , Miao Hui
Published: March 2015

Sets up a nonlinear vehicle dynamic model of eight degrees of freedom and simulates in Matlab/Simulink environment using three anti-lock braking control algorithms, which contain PID, logic threshold and sliding mode variable structure. On the basis of the work, the improving effects for vehicle directional stability, the control effects analyzing from the aspects of tire/whole vehicle parameters and the phase-plane of slid slip angel and its rate are compared and analyzed. The results show that: PID responses fastest but with larger overshoot, logic threshold has smallest fluctuations thus can be implemented more easily, sliding mode control responses slowest but can hold the slip rate more accurately.
The Design of Laboratory Management System Based on Embedded Video and Campus Card
Authors: Zhu Ling , Wang Xiao Long , Zhang Pan Pan , Ma Hong Xing , Wei Lin Xing
Published: March 2015

In order to further strengthen the management of open laboratory in colleges and universities and improve the utilization rate of equipments, we design and develop a kind of laboratory management system based on embedded video and campus card. Among it, the video monitoring module combines with the embedded technology, image processing technology, internet communication technology and so on, which is used to achieve real-time display and remote video monitoring in the laboratory; campus card is used to implement the student identity authentication, laboratory access control and power supply management.
Research of Distribution Automation System FA Function Test Method
Authors: Qian Yi Min , Li Peng , Su Lei , Guo Gui Tong
Published: March 2015

Feeder automation (FA) function is a very important part of distribution automation system (DAS). In this paper, the current main way to achieve the FA functions is introduced, and the testing method of FA function is studied, based on the requirements of the standard distribution automation systems. Meanwhile the standardized testing method and testing process is researched according to the characteristics of implementation. The paper also brings forward a set of feasible testing methods of FA function of DAS.
Research on Networked Collaborative Technical Service Based on Cloud Computing
Authors: Zhang Tian Rui , Yu Tian Biao
Published: March 2015

On the basis of analyzed the modern manufacturing mode and technical service under the cloud computing conditions, the networked cooperative technical service mode based on cloud computing was presented for manufacturing enterprise to fast response the market demand as a new method. Firstly, ontology-based semantic identification technology has been studied, then the basic concept of ontology and created principles and method of ontology were expounded, and the algorithm of semantic identification for technical service information in production process was described. Secondly, made use of fuzzy analytic hierarchy process and Hungarian algorithm, queue and assignment of the technical services task in production process were researched respectively.
An Efficient and Verifiable Privacy-Preserving Data Aggregation Scheme for Wireless Sensor Networks
Authors: Yang Li Jun , Ding Chao , Wu Meng
Published: March 2015

Data aggregation is an important techniques to save energy consumption in wireless sensor networks. However, the compromised aggregators may forge fake values as the aggregated results of their child nodes. In this paper, we proposed an efficient secure data aggregation scheme to overcome the problem. Integrated with the privacy homomorphism and the aggregate message authentication code techniques, our proposal can provide both end-to-end privacy and data integrity in data aggregation for sensor networks. The performance analysis shows that compared with other existing secure data aggregation schemes, the proposed scheme has remarkable advantages in terms of computation and communication overhead.
Design on Text Retrieval Algorithm in Cloud Computing Environment
Authors: Tian Hong Xia , Cui Xue We , Wang Jing , Wang Ying Jie
Published: March 2015

This paper presents a lightweight index does not suspend services online update program, and demonstrate the performance of the index update program from the theoretical analysis and experimental data in two ways. A new method of MapReduce existing index methodology based on this design and further discussion are done in the paper, in the index MapReduce and Hadoop MapReduce feasibility aspects, the design flaws through experimentation.
Leakage Power Reduction in 32-bit Digital Comparator Using Modified Power Gating Technique
Authors: Amuthavalli G. , Gunasundari R. , Nijandan A.
Published: March 2015

As scaling down of CMOS transistor’s channel length is done for miniaturization, the design community primarily focuses on the high performance & power-aware design. The power consumption of any circuit solely holds the performance and the life of it. But static power consumption deteriorates them and dominates the dynamic power consumption because of its leakage components. A modified approach of pulse triggering in the Power Gating technique called MPG (Modified Power Gating) is proposed to reduce the static power consumption (leakage power) of digital subsystems. Sub threshold leakage power of MPG Inverter (INV) and 32-bit Digital Comparator (DC) is analyzed and reduced with 35% to 40% leakage savings compared with conventional and existing techniques by simulating it in Cadence GPDK.
The Theoretical Analysis and Optimization of the Fuel Injection Drive Circuit for Diesel Engine
Authors: Bu Jian Guo , Zhou Ming , Dong Ge , Feng Guang Shuo
Published: March 2015

In order to achieve different response indifferent moment of fuel Injection Solenoid, a driving mode of Peak&Hold is generally applied to electronic control fuel injection system of the diesel engine. The theoretical analysis of high speed response and duplicate supply drive circuit based on the energy recovery is made, and a theoretical guidance for optimization design is presented. According to an electronic unit pump developed by ourselves, the optimization design of drive circuit for the fuel injection system is done. The results showed that during the process of injection, the time of current of solenoid valve form 0 to 20A is 224, and the turn-off time is 120which is a little longer than that of the high speed circuit based on the avalanche. And the turn-off time is met the requirement of control precision. With many advantages, such as energy saving and heat reducing, the high speed response and duplicate supply drive circuit based on the energy recovery will become a good choice in electronic control fuel injection system.
The MCCB Electrical Clearance and Creepage Distance Measurement Uncertainty Evaluation
Authors: Zhang Jing , Wang Feng , Zhou Jun Gang , Hu Ming Long
Published: March 2015

The electrical clearance and creepage distance are two key parameters for the design of MCCB (molded case circuit breaker, MCCB), which directly influences the electrical safety performance of MCCB. In this paper, the electrical clearance and creepage distance measurement uncertainty were evaluated through the uncertainty sources analysis, the mathematical model establishment and the components uncertainty calculation, to ensure the accuracy of the measurement results.
Preparation of WPU Wet-Rubbing Fastness Improver
Authors: Cui Shu Ling
Published: March 2015

A wet-rubbing fastness improver was prepared by two steps: (1) synthesis of waterborne polyurethane (WPU) through the reaction of diphenylmethane diisocyanate (MDI), polyethylene glycol (PEG), dimethylol propionic acid (DMPA), and diethylenetriamine; (2) modification of WPU by reaction with epichlorohydrin. Influence of temperature, time, concentration and ratio of monomers on the preparation was studied. The optimal process for WPU synthesis is as follows: temperature 100°C, time 3h, diethylenetriamine 1.5 % and DMPA7% (on weight of monomers). The modification reaction can be proceeded at temperature 100°C for 2h with epichlorohydrin 2.7 %.
Synthesis and Optical Properties of Strontium Aluminate with Industrial Sodium Aluminate Solution
Authors: Wang Hong Wei , Ma Ke You
Published: March 2015

Eu2+,Dy3+co-doped strontium aluminate with high brightness and persistent luminescence was prepared by solid-state reaction with aluminium hydroxide prepared from refined industrial sodium aluminate solution as the aluminate-containing material. The effects of rare earth dosage and sintering temperature on optical properties of the phosphor were investigated. The samples prepared under the optimal conditions were characterized by XRD patterns and afterglow decay curves, The results show that under the conditions of x (Eu)=3%,x (Dy)=3%, sintering temperature 1300°C, sintering time 4h and w (H3BO3)=9%, the prepared phosphor remains in the crystal structure of SrAl2O4,its optical properties is the best and brightness is the highest with a main excitation wavelength of 360nm and a main emission wavelength of 510nm. The decay time of the persistence indicates that the phosphor has bright phosphorescence and maintains a long duration.
Research on Microstructure and Low Temperature Properties of Polymer Modified Asphalt
Authors: Wang Lan , Jia Yong Jie , Feng Lei
Published: March 2015

In view of three kinds of polymer modified asphalt, Compound rubber powder modified asphalt, rubber powder modified asphalt and SBS modified asphalt, were commonly used in the Inner Mongolia region, scanning electron microscope (SEM) were used to observe the macroscopic structure morphology of asphalt before and after aging , getting the influence of aging effect on modifier’s distribution state in asphalt and interface combination properties between the asphalt, that is, after aging, three kinds of modifier and asphalt interface characteristic deterioration. By using bending beam rheometer (BBR) three kinds of asphalt after aging were conducted trabecular bending creep experiments under different temperature, through analyzing the changing rules of bending creep stiffness modulus S and the value of m, it can be get that: composite rubber powder modified asphalt has the best low temperature performance , followed by the crumb rubber modified asphalt.
Experimental Study on Ultrasonic Shot Peening Forming and Surface Properties of AALY12
Authors: Liu Chao Xun , Lu Shi Hong , Miao Wei , Song Pan Feng , Wu Tian Rui
Published: March 2015

Ultrasonic shot peening (USP) on AALY12 sheet was studied. Several parameters (arc heights, surface roughness, surface topography and micro hardness) with different USP process parameters were measured. The research proposes that radius of curvature of shot peened sheet increases with time and electric current decreasing, while increases with pin diameter increasing, and radius of curvature reaches a saturation level after a specific processing time and electric current. An empirical model of the relationship between radius of curvature and pin diameter, electric current, time was also obtained. The research shows that the increment of surface and vertical micro hardness of material is more obvious with longer time and higher value of electric current, which can be up to 20% and 28% respectively.
Study on Surface Processing of Non-Rotational Symmetry
Authors: Zhang Er Hong , Zhang Hua Long
Published: March 2015

This paper studies on technology of slow tool servo method and the processing of high efficiency. High precision surface NRS goal is studied for factors affecting theNRSworkability and surface machining accuracy. Including slow tool servo theory, research tools, tool path generation, surface microstructure simulation, slow tool servoNRSsurface machining and simulation systems development, installation errors and adjustment tool,Yto linear turret design,NRSsurface machining experiments.