bluuebunny/crossref_metadata_2025 huggingface dataset:
The Design and Analysis of the Key-Stream Generator Based on the AES
Authors: Shi Hui , Qian Xu Dong , Lu Jian Wei , Gong Jing , Deng Yuan Qing
Published: June 2014

The key-stream generator is the most important algorithm component of the stream cipher. At the present, it is an important development direction of the stream cipher algorithm that uses complex block cipher algorithms to construct high performance key-stream generators. The paper puts forward a new design method of the key-stream generator based on the AES algorithm. This method is based on the CFB mode of the AES algorithm, combined with the variable-step feedback shift. Then the paper analyses the randomness of the key-stream produced by the new key-stream generator. This new key-stream generator really improves the cryptographic properties of the key stream generator and to enhance the security of stream cipher.
Experiments of Low-Grade Heat Organic Rankine Cycle Power Generation Optimal Load Characteristics
Authors: Tang Lei , Wang Yu Ping , Yang Ping , Weng Yi Wu
Published: June 2014

This paper presents the experimental study of the small organic Rankine cycle power system performance under different heat source temperature and different load resistance,1kW experimental system was built using scroll expander with the working fluid R600a. Experimental results show that when heat source temperature does not exceed 120°C, the system has a maximum power for 1.05kW and power generation efficiency of up to 4.51%, the expander rotation speed and expansion ratio can reach 2922rpm and 3.03, respectively; Experiment obtained the variable condition operating characteristics of the scroll expander and permanent magnet generator and the relationship with the load resistance; There exist optimal load resistance to make power generation and unit power output and power generation efficiency maximum at the different heat temperature and different working fluid flow.The scroll expander should match permanent magnet generator and the load resistance when designing systems so that the system can get optimal performance.
Decoupling Control for Bearingless Synchronous Reluctance Motor Based on Fuzzy Inverse Model
Authors: Li Zhang , Zhu Huang Qiu , Zeng Run Zhang
Published: June 2014

For the bearingless synchronous reluctance motor (BSRM) is a multivariable, strong coupling, multi-input and multi-output system, based on the adaptive inverse control theory, a decoupling control method based on the T-S fuzzy inverse model identification is put forward in this paper. According to the input and output information of the system, a fuzzy inverse model of the motor control system is established, then making the inverse model and the original control system in series forms pseudo linear hybrid system to realize the approximate linearization and dynamic decoupling of the motor control system. Building the composite system and proceeding research in the Matlab/Simulink environment, the simulation results show that the control strategy can realize dynamic decoupling among the electromagnetic torque subsystem and the radial suspension force subsystem and among thex- andy-direction of the suspension force, and with excellent static and dynamic performance and adaptive ability.
Study on Direct Suspension Force Control of Bearingless Permanent Magnetic Slice Motor
Authors: Gu Ying Yue , Zhu Huang Qiu , Zeng Run Zhang
Published: June 2014

The theory of direct torque control of traditional permanent magnet synchronous motor is applied to the radial suspension force control of a BPMSM in this paper.With the integration of the space vector pulse width modulation, a novelty SVPWM direct suspension force control system for the BPMSM is constructed.On the basis of mathematical modeling,the detail control algorithm is deduced.Then the control system is simulated with Matalab/Simulink,and the results show that the control algorithm is simplified and the torque ripples are restrained，fine static and dynamic performance is brought to the motor.
Calculation Strategy of Automatic Shape Control in Hot Strip Mill
Authors: Liu Zi Ying , Sun Yan Guang , Song Xiang Rong
Published: June 2014

This paper, aimed at Ganglu 1500 hot strip rolling project, developed advanced shape control system. Entry profile calculation strategy was developed. Natural output profile was defined. Profile distribution model based on the buckling limit was developed. Practical applications in domestic 1500 hot strip mill show that the setup calculation strategy achieved good effect and enhanced the profile and flatness precision
Efficiency Analysis of Series Connection Ground Source Heat Pump Water Chiller-Heater Unit
Authors: Tan Chao Yi , Yang Peng Fei , Wang Meng Meng , Hu Hai Hua , Zhang Guo Qiang
Published: June 2014

In order to improve EER of the ground source heat pump system and reduce heat transfer area of the ground heat exchanger, the authors had developed a series connection ground source heat pump water chiller-heater unit, after theoretical analyses, proved that placing the water chilled in front of the hot water unit could acquire a higher EER comparing to the opposite. In the meantime, this unit had a higher EER than a common water chiller-heater unit or a water chiller-heater unit with condensing heat recovery device. In an air conditioning system of ground source heat pump, employing the above mentioned unit can also reduce heat transfer area of the ground heat exchanger. It suggested that series connection ground source heat pump water chiller-heater unit is a kind of technology with a great development potential.
A Novel Approach for Path Planning Based on Reactive Behavior-Artificial Potential Filed
Authors: Yang Long Xiang , Liu Zai Xin , Tang Hao
Published: June 2014

The main objective of this paper is to focus on the local minima and the GNRON issues encountered in path planning by the artificial potential field (APF) method, and propose a novel approach to plan a trajectory adaptive for the environment that the obstacles are randomly distributed. By introducing the ideas of reactive behaviors (RB), the RB-APF method is presented, which combines the efficiency of the APF with the simplicity of the RB, so it can be suitable for real-time application in mobile robots. In this algorithm (RB-APF), the switch conditions and optimal selection equations are reasonably designed with the consideration of the different circumstances of the robot located in. Simulations are presented and the results further demonstrate that the proposed approach is applicable for the environment that obstacles are randomly distributed.
A Novel Finite Element Method Based Beam Propagation Method without Using Slow Varying Envelope Approximation
Authors: Yu Bing , Xia Han , Xu Zhun , Chen Xiao Ye , Sun Xian Han , Ge Jun Xiang
Published: June 2014

A novel finite element method (FEM) based wide-angle (WA) beam propagation method (BPM) was presented whereby the scalar Helmholtz equation was solved without using the slow varying envelope approximation (SVEA) and was more general and precise than the previous well-known WA-BPM proposed by Hadley. The accuracy of this novel scheme was demonstrated in comparison with the existing approach.
Research on Attention EEG Based on the Multiscale Jensen-Shannon Divergence
Authors: Zhang Zheng Xia , Xu Si Qiu , Zhou Er Ning , Huang Xiao Lin , Wang Jun
Published: June 2014

The article adopted the multiscale Jensen-Shannon Divergence analysis method for EEG complexity analysis. Then the study found that this method can distinguish between three different status (Eyes closed, count, in a daze) acquisition of EEG time series. It showed that three different states of EEG time series have significant differences. In each state of the three different states (Eyes closed, count, in a daze), we aimed at comparing and analyzing the statistical complexity of EEG time series itself and the statistical complexity of EEG time series shuffled data. It was found that there are large amounts of nonlinear time series in the EEG signals. This method is also fully proved that the multiscale JSD algorithm can be used to analyze attention EEG signals. The multiscale Jensen-Shannon Divergence statistical complexity can be used as a measure of brain function parameter, which can be applied to the auxiliary clinical brain function evaluation in the future.
Design of Soil Pollution and Restoration Simulation System Based on LabVIEW and PLC
Authors: Hao An Feng , Wang Ru Yi , Ye Xu Ming
Published: June 2014

With the world's population growth the industrialization process and the unreasonable use of the environment,soil pollution problem has been increasingly prominent, the soil will become another shortage resource. This article introduces akind of soil pollution and restoration simulation system,the whole system simulates proliferation, migration and transformation process of different pollutants in different soil types, different hydrogeological environment three-dimensional space. The systerm also uses physical and chemical, biological and other repair method to repair contaminated soil. The use of LabVIEW graphical programming language to design PC man-machine interface looks simple and intuitive. Based on LabVlEW serial communication function, we develop the LabVIEW and PLC communication driver and achieve the real-time monitoring of the whole system ,which provides equipment and data support for the pollution of the soil.
Method of Gun Barrel Life Prediction Based on BP Network
Authors: Yang Ya Dong , Ma Ji Sheng , Jia Chang Zhi
Published: June 2014

Aimed at the problem in the gun barrel life prediction, a method of gun barrel life prediction based on record of firing was pointed out. On the basis of internal trajectory resolving, the equivalent life transform coefficient for gun barrel based on the overall heat in origin of rifling and the overall gun pressure was computed. And by assuming we wore gun barrel life in canonical record of firing, a conversion model between the equivalent life transform coefficient for gun barrel and variety of record of firing which could be used to realize the gun barrel life prediction was built by using BP network.
Study on the Development of Smart Library under Internet of Things
Authors: Du Liang , Liu Tao
Published: June 2014

Internet of things (IOT) technology will bring about a series of profound changes for libraries. Starting with the conception of IOT, the article introduces the origin and characteristics of IOT, summarizes the present development, designs the system of smart library, elaborates on the impact of library development, analyzes the key problems of application.
Based on Computer Graphics Visualization Technologies
Authors: Zhang Rong
Published: June 2014

With the development of calculation ability and data processing ability of computer,so process complex data has become possible,with computer graphics methods, in a easily observe graphic way to represent data requirements has became popular day by day. The article describes some fields which attract users' attention,such as scientific processing, landscape simulation,visualization research technique in medical diagnosis.
Bidirectional Random Walk Based Mobile-Sink-LocationPrivacyin WSN
Authors: Zhang Jun
Published: June 2014

As wide applications of wireless sensor networks, privacy concerns have emerged as the main obstacle to success. When wireless sensor networks are used to battlefield, the privacy about sink-locations become a crux issue. If sink location will be exposed to adversary, the consequence is inconceivable. Random data collection scheme has a problem that message latencies become larger higher for protecting mobile-sink-locationprivacy .In this paper, BDRW (Bidirectional Random Walk) is proposed to preserve mobile-sink-location privacy. In BDRW, data are forwarded by directional random walk and stored at pass nodes in the network, the sink move in directional random walk to collect data from the local nodes occasionally, which prevents the attackers from predicting their locations and movements. Compared to random data collection scheme, BDRW has smaller message latencies, while providing satisfactory mobile-sink-location privacy.
A 12-Input-3-Output RBF Neural Network Model of Load and Main Steam Pressure Characteristics for Ultra-Supercritical Unit
Authors: Ma Yong Guang , Ye Zhi Yu
Published: June 2014

In this paper, an 1000MW ultra-supercritical boiler unit was taken as the research case. The neural network, RBF, was used to build the model for the 1000MW ultra supercritical unit based on Matlab. The inputs of the model include fuel amount, feedwater flow,turbine valve opening demand. The outputs include unit load, main steam pressure and intermediate point temperature. The simulation results proved the validity of the model. The model can be used to improve the response rate of the unit load and optimize the coordinating control with certain practical engineering significance.
Application on the Artificial Filling Foundation Treatment for Housing Construction Project in Mountain Highway
Authors: Zhang A Ling , Qi Dan Ni
Published: June 2014

Along with large national investment in infrastructure construction, the mileage of the highway, which is one of the infrastructures, has increased year by year. There are many kinds of artificial filling foundation treatment methods for housing construction project in mountain highway facilities. This paper, combined with the engineering example, focuses on the dynamic compaction method and the replacement method.
The Research on Cost Management of Steel Pipe Enterprise Based on Activity-Based Costing
Authors: Geng Hao Peng , Dong Shao Hua , Zhang Hua
Published: June 2014

In this paper, through analyzing the current cost management process of a steel pipe enterprise, the disadvantages of the method used in the enterprise is pointed out. Cost deviation can be greatly reduced by using Activity-Based Costing. Finally, a cost management system is developed.
An Overview of Active Power Filter
Authors: Zhou Xue Song , Wang Da Yan , Ma You Jie
Published: June 2014

APF has its outstanding features comparing with PPF, it is a new type harmonic suppression and reactive power compensation device. This paper makes an introduction about two key technologies about APF, and it makes a prediction to the trend of the key technologies. APF is the main harmonic suppression technique at present and in the future. At present, there are large of loads in every industry, such as, electric arc furnace in steel industry, the welder in automotive industry, and these industries are important sectors of the national economy, we can do not stop them running, only installing APF in the appropriate location .Therefore, APF has broad prospects for development in various industries.
Technological Progress in the Material Research & Development for Gen-IV SCWR Advanced Reactors
Authors: Guo Juan Yan , Lin Xian Jun , Ding Liang Bo , Liu Zhi Ming
Published: June 2014

As development of Generation IV reactors, research and development on materials of high thermal resistance, corrosion resistance is necessary to support advanced reactors applications. The design objectives for candidate materials in supercritical water cooled reactors were summarized and introduced in this paper, as well as material research activities and progresses in foreign countries. In the next decades, a significant number of new power plants would be constructed in China, it would be a good opportunity for promoting international collaboration and material R&D for SCWR.
Structural Optimization of Three Translational Parallel Sorting Robot
Authors: Xie Jun , Deng Hui , Yang Qi Zhi , Liu Yue
Published: June 2014

The kinematics model of the robot was established, and its structural parameters were studied. Based on coordinate transformation, the inverse solution of the robot was obtained. Its workspace was solved by MATLAB program. Three-dimensional diagram and projection drawing on XY plane of workspace were obtained. In addition, the sorting range various with the different value of Z was studied and obtained. Finally, on the premise of meeting working range of the robot, using the minimum mass of the moving parts as optimization objective, the structural parameters of the sorting robot were optimized using the search method. Simulation results show that the optimized robot can achieve the minimum weight of moving parts and meet the preset sorting range. It is also ensured the sorting flexibility.
The Study of Microwave Electromagnetic Force
Authors: Liu Zhong
Published: June 2014

The electromechanical interaction between electromagnetic wave and the electric current system is a fundamental problem in electrodynamics.However, for particular parameters of electromagnetic wave and The electric current system, Through the electromagnetic interaction，there may be some significant physical effects depended on the Effective electromagnetic force, The systematic and thorough study is of great significance for the advance of electromagnetic theory and microwave technology.
Study on a Load Predictive Governor Control Method Based on Diesel Engine Models
Authors: Li Yan Qiang
Published: June 2014

This paper briefly reviewed the development process of diesel engine speed control, analyzed the control characteristics of high real-time. Also, the basic methods of conditions predictive control were put forward. Then, a load predictive governor control method based on diesel model was studied focusing on the model, simulation and experiments. The results show that this method has a significant effect to improve the engine speed control dynamic performance, and has a useful engineering application prospects.
Application Research of Electrical Supercharger for Improving Performances of Diesel Engine under Plateau Environment
Authors: Zheng Kun Peng , Wei Zhen Biao , Qin Bao Zhan
Published: June 2014

Against the problems that the working performances deterioration of high-power engine under plateau environment, an electric supercharger system is designed by applying modern control and sensor technology, and after testing performances of the electric supercharger multiple times, the system is optimized according to the internal flow field distribution and export flow characteristics. The tests prove that the system which controlled by electric control device can achieve transient air supply rapidly. Then increased the air flow rate significantly, and it is able to recover the most of the power in low speed part, which propose the feasible way to the problem of engine intake air shortage under plateau environment.
Automatic Extraction of Multi-Vehicle Trajectory Based on Traffic Videotaping from Quadcopter Model
Authors: Gao Hang , Kong Si Li , Zhou Siao , Lv Fang , Chen Quan
Published: June 2014

This dissertation proposes a new approach for vehicular trajectory detecting. A radio-controlled quadcopter is used to shoot live traffic flow videos which can be flexible enough to meet the requirements of various road conditions. A self-developed software is created to analyze traffic videos efficiently, which can extract the coordinate of each vehicle from the video and draw the trajectories of those vehicles automatically. The system only produces a relatively small bias, which is allowed in the practical field of traffic engineering. The proposed detection system can not only get the trajectory of vehicle conveniently, but also provide an easy way to collect the data on the velocity and the acceleration of vehicles and, even, set a foundation for driving behavior monitoring and analysis on the roads.
Analysis of Static Bending Rigidity with Car Body Lightweight Design for Certain Model of Electric Vehicle
Authors: Xu Zhen Yu
Published: June 2014

Taking a certain urban model of electric vehicle as example, DC04 steel plate has replaced with high-strength steel plate BH340 for some parts of the car body on the purpose of reducing the car weight; at the same time, reduced the thickness of steel plate at the replacing spots, and then set the finite element model for the car body to compare its bending rigidities before and after replacement. On the premise of satisfying car body’s bending rigidity, it could make car body to reduce a weight of 23.2KG to satisfy the requirement for lightweight design.
Prediction of Flow Stress Behavior of 70Cr3Mo Back-Up Roll Steel Using Modified Zerilli-Armstrong Model
Authors: Ren Fa Cai , Chen Jun , Chen Fei
Published: June 2014

The stress-strain data from hot compression tests over a wide range of temperatures (1173–1473 K at an interval of 100 K) and strain rates (0.01, 0.1, 1 and 10 s-1) were conducted using Gleeble-1500D thermo-mechanical simulator. A modified Zerilli-Armstrong constitutive model was developed using the experimental data of 70Cr3Mo back-up roll steel. The predictable efficiency of this model was evaluated by correlation coefficient and the value was 0.9902.
Synthesis and Properties of Inorganic Organic Composite UV Shielding Materials with Supramolecular Structure
Authors: Zhang Xiao Bo
Published: June 2014

In this paper, 2 - (2 - hydroxy - 5 - sulfonic acid-phenyl) -5 - amino-2H-benzotriazole had been inserted into the precursor layer by ion exchange method using Mg/Zn/Al-CO3-LDHs as precursor. The samples obtained were characterized by XRD, SEM, laser particle size analyzer, IR, UV spectra and TG-DTA. The results show that, by controlling the conditions, the CO32- ions of precursor layer can be replaced by HASB, producing strong supramolecular interaction between the main bodies. The material was obtained in the ratio of MgZn2Al, can achieve the UV absorption maximum and better thermal stability, resulting in a new type of inorganic - organic composite supramolecular UV shielding materials.
Preparation and Characterization of Fe Doped Bi2Ga4O9 Ceramics
Authors: Chen Huan Huan , Zhang Xiao Yan , Qi Xi Wei , Zhou Zhao Jie , Sun Gui Fang
Published: June 2014

A series of Fe-doped Bi2(FexGa1-x)4O9 (x=0.1,0.2,0.3,0.4,0.5) ceramics were synthesized by solid-phase method with sintering process. The influences of Fe doping content on phase, morphology, dielectric properties are discussed. XRD results show that there is no second phase in Fe-doped Bi2(FexGa1-x)4O9 ceramics. The SEM analysis indicates the grain size of as-prepared doped samples are relatively uniform and estimated to be about 1–4μm. The permittivity of as-prepared doped samples increases and the dielectric loss decrease compared to pure Bi2Ga4O9 ceramics.
Preparation and Performance of Wax Emulsionusing in Drilling Fluid
Authors: Yu Pei Zhi
Published: June 2014

An O/W type paraffin wax emulsions was prepared using Tweenand Span emulsifiers, and liquid paraffin. The influences of temperature, HLB and surfactants concentration in particle size of paraffin wax emulsions were studied, as were the stability of paraffin wax emulsions. The application performances in drilling fluid of paraffin wax emulsions were researched with respect to artificial core line swelling and shale recovery. Results showed that the best conditions of preparation of emulsified wax: surfactants concentration was 5%, temperature was 50°Cand HLB was 10.1-10.5. It was found that paraffin wax emulsions possess strong inhibition ability for hydration, swelling and dispersing of clay and shale. The inhibition ability of paraffin wax emulsions enhanced with KCl.
Performance Comparison of Different Impellers in Ф6.5m Pulp Conditioner
Authors: Zhang Jian Hui , Chen Qiang , Wang Qing Fen
Published: June 2014

The success of 200m3 and 300m3 flotation cell in industrial application calls for matching conditioner. Experimental research in Ф6.5m conditioner is taken to select suitable impeller and rotating speed. 4PB impeller and 4HB impeller are compared in flow features and power consumption in single phase flow. The conclusion that the power consumption per cycle-volume by 4HB impeller is 80% of that by 4PB impeller is drawn. 4PB impeller and 4HB impeller are compared in suspension characteristics in double-phase flow. The conclusion that 4HB impeller can suspense the mineral by lower power consumption while 4PB impeller cannot under the same situation is drawn. Thus 4HB impeller is prior to be used in large pulp conditioner. Based on this experiment, many large pulp conditioners are successfully applied
An Electrode Sets with a Cylindrical Cathode and a Platy Anode for Reclamation of TFT-LCD Surface
Authors: Pa P.S.
Published: June 2014

The low yield rate of ITO thin-films is well known in semiconductor production processes. In the current study, an electrode sets with a cylindrical cathode and a platy anode as a reclamation process for the nanoscale removal of the indium tin oxide (ITO) nanostructure from the color filter surface of TFT-LCD displays is presented. In the current experiment, the major interest lies in the features of the technology and the design of the cylindrical cathode and the platy anode for the electrochemical etching process. For this process a steep gradient of the platy anode provides large discharge mobility and a better removal effect. A thin platy anode, a small gap-width between the cylindrical cathode and the ITO surface, or a high flow rate of electrolyte corresponds to a higher removal rate of the ITO-layer. A large current flow combined with a high feed rate of the display also results in a fast removal rate. By establishing a recycling process for the ultra-precise removal of the thin-film nanostructure, the optoelectronic semiconductor industry can effectively recycle defective products with a reduction of both production costs and pollution.
Research on Communication Reconnaissance Information Processing and Fusion
Authors: Quan Hong Wei , Peng Dong Liang
Published: June 2014

In complex electromagnetic signal environment, the reconnaissance equipments in tactical communication system can uninterruptedly reconnoiter a variety of enemy’s communication signals as well as access a number of characteristic parameters of time, frequency and space domain by searching analysis, feature extraction, direction finding and comprehensive identification. After a series of signal processing, data mining and information fusion, we can get the characteristic parameters of the electromagnetic spectrum of the enemy’s reconnaissance equipments, which provide the basis for analysis and estimation of electromagnetic situation in battlefield. In this paper a multi-hierarchical blackboard model is proposed for multi-sources communication reconnaissance information mining and fusion and the effectiveness of the method is validated in simulation environment.
Piston Optimization Design of Linear Compressor for Refrigerator
Authors: Li Zhi Hai , Liu Yan , Zhong Yuan
Published: June 2014

A linear compressor does not have a crank mechanism to drive the piston and is driven directly by a linear motor, which has a higher electrical efficiency than a traditional rotary induction motor. So it becomes an important research direction of future refrigerator compressor. This paper aims to optimize the structure of piston and cylinder of linear compressor to reduce friction loss and improve compressor’s efficient. From the design analysis and experiment, the structure and material of piston and cylinder are improved. All the support points are on the piston. Material of cast iron is used for piston and cylinder. And phosphate processing is performed on the surface. Experiments verified that the changes can reduce wear and improve the efficiency of the compressor.
A Weapon System Reliability Allocation Based on Direct Searching Method
Authors: Yu Hai Long , Wei Xian Jie , Jiang Zeng Liang , Zhang Yan Pu
Published: June 2014

In this paper, through the analysis on the basic idea, characteristics of direct searching method, optimization calculation steps and constraint conditions have been concluded, and direct searching method was applied to the research on the reliability allocation problem in a complex weapon system to prove its feasibility. This paper is of great significance to the study of reliability distribution of weapon system.
CFD Analysis of Scramjet Combustor with Non-Premixed Turbulence Model Using Ramp Injector
Authors: Pandey Krishna Murari , Roga Sukanta
Published: June 2014

This paper presents the supersonic combustion of hydrogen using strut injector along with two-dimensional turbulent non-premixed combustion model with air inlet temperature of 750 0k and vitiated Mach number of 2. In this process, a PDF approach is created and this method needs solution to a high dimensional PDF transport equation. As the combustion of hydrogen fuel is injected from the strut injector, it is successfully used to model the turbulent reacting flow field. It is observed from the present work that, the maximum temperature of 2096 0k occurred in the recirculation area which is produced due to shock wave-expansion and the fuel jet losses concentration and after passing successively through such areas, temperature decreased slightly along the axis. From the maximum mass fraction of OH, it is observed that there is very little amount of OH around 0.0017 were found out after combustion. By providing strut injector, expansion wave is created which causes the proper mixing between the fuel and air that results in complete combustion.
Improvement of Accuracy to Grind by Changing Position Control Gain for Shape-Grinding
Authors: Minami Mamoru , Adachi Ken , Sasaki Satoshi , Yanou Akira
Published: June 2014

This research aims to achieve a new grinding robot system that can grind an object into desired shape with force-sensorless feed-forward control. However, there is a problem that vibration occurs during the grinding work has emerged, which makes the accuracy of the grinding become worse. Therefore, this paper proposes a method that changes the gain of position control for suppressing the vibration. Results observed by real grinding experiment have confirmed how our proposed method effectively improved accuracy of the grinding.
Kinematic and Force Analysis of Robot with Adaptive Electric Drives
Authors: Ivanov Konstantin Samson , Ualiev Gahip , Tultaev Baurjan
Published: June 2014

Kinematic and force analysis of robot in which each module has the adaptive electric drive is considered. The adaptive electric drive contains electric motor and adaptive transmission mechanism with two degrees of freedom. Definability of motion of the adaptive electric drive is confirmed by experimental check. The adaptive drive is extremely simple in design. It has transfer ratio depending on loading only at the expense of mechanical properties and does not demand any control. The equations of adaptive mechanism parameters interconnection are developed. Stop regime of motion at motionless end-effector of the module allows to avoid an overloading and to overcome emergencies. In the robot with adaptive drives of modules the stop regime of motion can be overcome at the expense of motions of other modules leading to decrease of resistance.
Design of Neural Network Controllers for the Horizontal Positioning of an Industrial Manipulator
Authors: Clitan Iulia , Abrudean Mihai , Mureşan Vlad
Published: June 2014

This paper presents the design of neural network controllers for the electro-hydraulically driven positioning system of an industrial manipulator. The manipulator is represented by an unloading machine that extracts the billets from a rotary hearth furnace. The design of a Narma-L2 controller and a Model-reference controller is presented. Neural network controllers can be used for the modeling and control of dynamical systems as long as a suitable neural network is chosen. The obtained controllers are compared on the basis of overall performances. The assessment of the results is done by means of simulation.
Emissions Level Approximation at Cold Start for Spark Ignition Engine Vehicles
Authors: Tarulescu Stelian , Soica Adrian
Published: June 2014

This paper present a study regarding the emissions produced at the engine cold start. Also, the paper presents a brief survey of current extra emissions estimation methods. The main goal of this work is to describe the relative cold start extra emissions as a function of exhaust gas temperature. Experimental research has been done for a light vehicle, Dacia Sandero, equipped with a 1390 cm3 Renault spark ignition engine (Power = 55 kW at 5500 rpm). There were been made several tests, in different temperature conditions, in the could season, using a portable analyzer, GA-21 plus (produced by Madur Austria). The parameters measured with the analyzer and used in the analysis are: CO, NO, NOx and SO2. It was concluded that the highest pollutants values ​​are recorded until the point when the catalyst comes into operation (when the gas temperature entering the catalyst is approx. 200 oC) and exhaust gas temperature is 40-50 oC. In order to accomplish a mathematical approximation of CO, NO and SO2 in function of exhaust gas temperature, logarithmic approximations and polynomial regressions were used. The curves resulted from the mathematical model can be used to approximate the level of CO, NO and SO2, for similar vehicles.
Dynamic Simulation in Mechatronic Concept of a Photovoltaic String Equipped with Solar Tracker
Authors: Alexandru Cătălin
Published: June 2014

The work puts forward the dynamic analysis and optimization of a photovoltaic (PV) system equipped with solar tracker. This is a PV string with three modules (panels) arranged in-line, which is oriented (rotated) to follow the Sun from East to West (i.e. the daily motion), the elevation being fixed in an optimal position (corresponding to the implementation area - Braşov). The MBS (Multi-Body Systems) environment ADAMS is used to develop the mechanical device of the tracking system, while the control system is designed by using the DFC (Design for Control) software package MATLAB/Simulink. The controller tuning is performed in a parametric design study, which is based on DOE (Design of Experiments) Screening technique. Virtual and experimental results are presented to demonstrate the performance of the PV tracking system.
Neural Temperature Control in a Water Cylinder
Authors: Sita Ioan Valentin , Mureşan Vlad
Published: June 2014

In this paper is presented a solution for controlling the temperature in a water cylinder, used for supplying a building with domestic hot water. Automatic temperature adjustment is achieved by using a neural controller in order to provide superior control performances provided by classical controllers. Also, the used control strategy is based on the use of reference model of the expressed process. Simulation control structure is done both in the absence, as well as in case of interference signals.
Evaluation of True Position Using Coordinate Measuring Machine
Authors: Budiský Roman , Králik Marian , Kost Ján
Published: June 2014

The article makes a contribution to the ever-important topic of evaluating geometric deviations of tolerated forms related to the datum system using coordinate measuring machines with a touch probe system. The datum system consists of the coordinate system and the coordinates planes. An integral part of the article is the quantification of the true position tolerated form related to the datum system and experimental evaluation of the deviation with calculation of measurement uncertainty, according to STN EN ISO 15530-3.
Shaped Glued Connection of Two Parts Made by Rapid Prototyping Technology
Authors: Lipina Jan , Krys Václav , Sedlák Josef
Published: June 2014

An increasing number of designs and subsequent production of parts created by the Rapid prototyping (RP) [1] technology led to a problem with the maximum workspace of the 3D printer. Due to this reason, it was necessary to work on the solution of joining the parts to overcome the limited workspace of the printer. This article is devoted to glue joints analysis of two parts made by RP technology. A great emphasis is given to the load capacity testing of the parts made this way. The measured values than may serve as a lead for the construction design of the outlined joints. The article builds on the knowledge gained during the previous testing of the screw connections of parts made by 3D printing technology [2].
Validation of Accelerated Reliability Test Techniques of Industrial Components Using Finite Element Analysis
Authors: Zaharia Sebastian Marian
Published: June 2014

The purpose of this paper is to validate the accelerated testing methodology of a component from the field of aviation (supple platinum) using the standard calculation method and the analysis with finite elements. The specimens made out of supple platinum from the helicopter’s structure have been put through to accelerated experiments. Using the data resulted from the analysis with finite elements, the data resulted from resistance calculations and the experimental data obtained from the testing of specimens, a comparative study was realized between the specific strain and the normal stress that were obtained. From the results of this comparative study, it is obvious the fact that the method of analysis with finite elements is an efficient instrument to validate the experiments.
Method for Manufacturing Custom-Shaped Prosthetic Parts from Titanium Alloys by Incremental Forming Using Industrial Robots
Authors: Cotigă Carmen , Bologa Octavian , Racz Gabriel , Breaz Radu
Published: June 2014

The last decade has shown an increasing interest in a new class of forming processes known as Incremental Sheet forming (ISF). A possible application for this new procedure, targeted by the authors of this paper, is the manufacturing of custom-shaped prosthetic parts for use in various areas of human medicine. Such prostheses can have a functional role, when they target the replacing of a functional component of the human body, or an esthetic role, when they target the solving of problems related to the appearance of the human body. In this paper the authors aim to determine the strain hardening curves for the titanium alloy Ti6Al4V at room temperature and at 800°C. The incremental forming process will be performed by means of an industrial robot.
Advanced Strategic Planning and Capability Identification in Order to Develop a Liquid Hydrogen Turbopump
Authors: Mihalache Radu , Popescu Jeni , Cuciumita Cleopatra , Olaru Daniel , Vilag Valeriu , Mălăel Ion , Stănică Cristian
Published: June 2014

This paper presents the activities that define a strategic development plan for a new liquid hydrogen turbopump that will equip a rocket engine and the capabilities of COMOTI Romanian Research and Development Institute for Gas Turbines in order to develop such type of product. The paper highlights the design, assembly and manufacturing stages for the two main components of a turbopump, the pump and the turbine. Subjected to analysis are the constructive solutions, performances, software for hydraulic, gasodynamic and stress calculus, and also the manufacturing technologies.
Simple System for Supporting Learning of Human Motion Capabilities
Authors: Wójcik Krzysztof , Golec Joanna , Piekarczyk Marcin , Szczygieł Elżbieta
Published: June 2014

The paper presents an idea of the automatic system which is capable of improving the rehabilitation process of people suffering from diseases of locomotor system, and is able to enhance a person’s learning the motion skills. The simplest form of the system consists of a MEMS (Micro Electro-Mechanical Systems) sensor which detects movements of parts of the human body. The article describes possible methods of classification of the sensor signal. As a result of this process, the system sends to the training person a message concerning appropriate correction of his motion. The authors assert that the system, using even unsophisticated hardware (one sensor integrated with a microcontroller) and a simple minimum distance classifier, is able to improve the rehabilitation or the learning process. The article attempts to articulate the main conditions determining an increasing of the efficiency of the proposed idea. Namely: creation of a communication standard between sensors and the host computer used by a physician/teacher, and taking into account the whole multidimensional signal provided by MEMS (3-axis accelerometer, gyroscope and magnetometer).
Human Body Kinematics and the Kinect Sensor
Authors: Ganea Daniel , Mereuta Elena , Mereuta Claudiu
Published: June 2014

For a good understanding of human body biomechanics scientist all over the world are using motion capture systems (MoCap). Such a system is mainly composed of one or multiple high performance cameras and a process unit for gathering key information. A low – cost solution for these systems is the Kinect sensor from Microsoft. The Kinect sensor is a depth camera that can be used for assessing full – body movements in terms of joint and/or segment positions and movement geometries. The resulting data can be used in the robotic industry, in clinical solutions, video gaming industries etc. The functionality of the equipment has been highly debated in many studies wherefrom result that the depth camera in question is accurate and reliable in studies such as human biomechanics. The aim of this paper is to explain the logics behind this equipment and its functionality. Therefore we present a new approach in constructing a 3D human skeleton model that can be used for assessing asymmetries by determining the human silhouette in 3D, the position of human body key points and joints, the angles between the track segments and full body kinematics.
The Influence of Vitamin C on the Oxidative Stress in Untrained Smoking Subjects
Authors: Trofin Petrut Florin , Honceriu Cezar , Ciobica Alin , Cojocaru Dumitru
Published: June 2014

Some researchers that have analyzed the connection between physical effort and oxidative stress parameters have reported changes, that is increase, decrease or stagnation of these biochemical indicators measured afterphysical effort. It is a known fact that the people who smoke are exposed to oxidative stress, which is accelerated during physical exercise. The study aims to assess the changes that occur following easy physical exercise, dosed at 50 % of maximal aerobic power, performed for 40 minutes on the cycle ergometer, and after the administration of 1000 mg of vitamin C, 12 hours before the same type of effort, on indicators of oxidative stress in untrained smokers. The evaluation of the VO2max, for the accurate calculation of maximal aerobic power and the percentage of the workout, was done by ergospirometry with aFitMate PRO Cosmed device. There were recorded changes in the activity of the superoxide dismutase, catalase, glutathione peroxidase and malondialdehyde concentration, which certifies the acceleration of oxidative stress after strenuous efforts of the subjects whereas after the administration of vitamin C, improvements have been achieved . The results lead to the recommendation of introducing vitamin C in the diet of the people who smoke and exercise regularly.
Image Distortion, between Unwanted Geometric Aberration and the Tool Used to Improve Observation Equipment Performance
Authors: Guzulescu Nicolae , Todirică Cornel , Lăpădat Daniel
Published: June 2014

An distortion aberration free optical system forms an orthoscopic image mean that is similar to original object, undeformed. Naturally imply that most optical systems are designed so that the image distortion is minimal, not to cause inconvenience to the user about either the object appearance – when it comes to a camera or camcorder, or the deformities that may cause measurement errors – when it comes to optical measurement and control equipment. However there are situations when distortion is desired to improve some performances of the observation optical system. In this article we present how distortion is used to increase the field of view, and also how distortion is used to optimize the field of view – resolution compromise.
Orbital Launcher NERVA as the First Proof of the Discontinuous Variational Solution for the Atmospheric Ascent
Authors: Rugescu Radu D. , Rugescu Dragos Ronald , Micu Efim
Published: June 2014

Since the earliest days of astronautics, more than a century ago, low cost space launchers persevered to be a long desire for the space flight thinkers. Once space flight became a daily business along the late `50-s, first by consuming large financial resources, the interest for cheap space launchers became even more laud. Today’s growing interest in small satellites have bolstered a large series of space technology companies including Virgin Galactic Corp., Garvey Spacecraft Corp., Quantum Research International, Ventions LLC, Sierra Nevada Corp., Generation Orbit Launch Services and even the giant Boeing to work on the development of various types of such vehicles, some of them of actually small size. They have announced recent progresses in their efforts to develop and test small-satellite launchers and rocket engines. Romanian space launcher effort includes the NERVA project, with the ORVEAL compound engine for the upper stage, securing the orbital injection, project developed by the team of professors and researchers from ADDA Ltd, Bucharest. This project is based on a series of innovative concepts, including the optimal ascent program first proposed by the ADDA team by means of the new discontinuous variational optimization, which is here described in detail.
Research and Application of Numerical Control Milling Machine Tool Length Compensation Instructions
Authors: Sun De Ying , Zhou Ping
Published: June 2014

the numerical control milling process that commonly use tool length compensation function instruction, correct and reasonable use of tool length compensation function instruction can improve efficiency and machining accuracy. This article mainly studies the three methods of application of tool length compensation function instruction, which can provide a reference for correct application of tool length compensation function instruction.
Thermodynamic Analysis of R410A Refrigeration Cycle with a Two-Phase Ejector
Authors: Hu Ji Chao , Liang Yuan Yuan , Chen Jiang Ping
Published: June 2014

A thermodynamic analysis of the ejector expansion refrigeration cycle (EERC) was carried out based on a two-phase flow model. First the ejector parameter was optimized under the given condition. Then the influence of condenser temperature and evaporator was investigated. Numerical simulation result shows that the EERC always has a better performance than the basic system. When the evaporator is 0°C, the system COP can be improved by 18.6%.
Analysis of the Effects of Fiber Gradient Distribution on the Mechanical Properties of Moso Bamboo
Authors: Chen Kai , Long Lian Chun
Published: June 2014

Bamboo is a fiber-reinforced bio-composite with superior structural behavior. For the purpose of analyzing the correlations between the mechanical properties of bamboo and fiber volume fraction, tensile tests were performed on bamboo test specimen, and the corresponding volume fractions of fiber and parenchymatous ground tissue were measured. Linear and curvilinear regressions were done from tested data of elastic modulus, tensile strength and volume fractions of fiber. The results display that there is an obvious correlation between bamboo tensile properties and fiber volume fraction. In order to analyze the effects of fiber gradient distribution on bamboo structural behavior, models composed of fiber and parenchymatous tissue were built based on different fiber distribution for comparative analysis. The analysis results show that the maximum deformation of 4 layers model is 3.86% less than 1 layer model, and the maximum deformation of 8 layers model is 8.87% less than 4 layers model. In the part of maximum axial stress, the maximum axial stress of 4 layers model is 3.27% less than 1 layer model, and the maximum axial stress of 8 layers model is 8.90% less than 4 layers model. Conclusion can be drawn from the comparison that the strength and stiffness of the model appear to be growing with the degree of fiber gradient distribution deepening from 1 layer model to 4 layers model, and 4 layers model to 8 layers model.It can be concluded that the mechanical properties of bamboo structure are significantly improved because of fiber gradient distribution.