bluuebunny/crossref_metadata_2025 huggingface dataset:
The Flow Characteristics Analysis of Transonic around Delta-Wing to Separate Water from Natural Gas
Authors: Wang Jun Qi , Zhang Yang Yang
Published: February 2012

The changes in flow channel area and convergence-expanding nozzle help to flow rate of natural gas to the sound speed, also increase diameter to accelerate flow velocity and finally reach transonic flow condition. At this point, the temperature drop makes saturated water in natural gas condenses into droplets, generates swirl around the delta-wing, realize gas-water separation. This paper concentrates on Flent6.1 software process gas flow around a delta wing simulation, explains expansion angle and attack angle of delta-wing, determines a reasonable delta-wing attack angle is 10°, pipeline expansion angle is 0.29°, and obtains velocity vector, mach number, total pressure, static temperature and other flow field details of the attack angle and expansion angle, which lay foundation for production and application of the technology.
The Driving Cycle Characteristic Parameters Research for Hybrid Electric Vehicle
Authors: Zhou Nan , Wang Qing Nian , Wang Peng Yu
Published: February 2012

The study on standard driving cycles is of great significance on design and control algorithms for HEV. This article applies the theory of uniform design on the driving cycle parameters research. According to the uniform design scheme for driving cycle parameters, not only greatly reduce the number of simulation experiments, by analyzing the experiment results, but also efficiently and intuitively identify the primary and secondary factors of driving cycle experiment parameters. Through the relevant energy management algorithm, simulation proves that the driving cycle parameters research on HEV is significance to improve the fuel economy.
A Design of an Intelligent Auto Sampler
Authors: Li Wen Tao , Yu Xiang , Liu Xing Ju , Yang Yi Yong , Xiao Guo Feng
Published: February 2012

A new developed Intelligent Auto Sampler is introduced in this paper. The configuration and features of the new product are also presented in details with the hardware structure and system controlling. A simulation analysis of the design is given out with the UG 3-D simulation software in this paper. The design proved to be stable.
A Case Study on Energy Saving and New Energy Services
Authors: Qiu Ze Guo
Published: February 2012

Energy conservation or energy saving is one of the most important methods for reducing CO2 emissions, which is known to be associated with global warming. Although development of renewable energy sources such as solar or wind energy is necessary, we must first pay attention to the fact that enormous amounts of energy are consumed uselessly at present. Energy saving should therefore be one of the first problems to be tackled. It may not only bring reductions in CO2 emission, but also may lead to savings in expenditure on energy. This paper introduces some of the initiatives taking place in Japan aimed at energy conservation.
A Diversity-Based Algorithm for Energy Detection
Authors: Qin Zhen Quan , Liu De Long , Sun Wei Feng , Hu Yan , Hui Huang
Published: February 2012

Energy detection is the most commonly used algorithm in spectrum sensing. For Unknown signal, the current energy detection has shortcomings on the performance of perceiving the primary users signals in AWGN channel or fading channel. The diversity technology can receive the correlation signals which contain the same information in different branches, then merge and output the signals to reduce the probability of deep fading at the receiving terminal greatly. Therefore, we introduce diversity into the energy detection to improve the ability of detection. Simulation result shows that, it can improve the cognitive ability and obtain diversity gain through reducing the impact of fading. With the increase of diversity numbers, our method obtains lower probability of false alarm detection and performs much better than the traditional energy detection.
Numerical Simulation of Ground Pressure Activity Caused by Orebody Mining under Road
Authors: Zhou Zong Hong , Hou Ke Peng , Ren Feng Yu
Published: February 2012

There is the Jinggu-Minle road to cross through the No. 3 ore clusters in Songjiapo copper mine. The surface ground deformation and strata movement caused by underground mining will threaten the road transportation safety, which doesn’t allow collapse. Using numerical simulation method, the ground pressure activity and deformation, movement mechanism of strata were analyzed under different mining methods. Moreover, some control measures such as reserving insulating pillar and point pillars were put forward to maintain the stability of mined-out areas and the surface road. An optimal mining scheme was recommended. The results showed that the mining process of No. 3 ore clusters can’t cause direct failure to road, and the failure of hanging wall rock will have indirect influence to the road with the lapse of time. Reserving the insulating pillar, top pillar and point pillars can effectively reduce the plastic area range of hanging wall and strata failure in the mining process. The results can provide theoretical basis for the actual mining design and rock strata control.
The Design of the Piston-Cylinder High Temperature and High Pressure Control System
Authors: Rao Jian Hua , Liu Xiao Kang , Zhou Dong Mei
Published: February 2012

Piston cylinder high temperature and high pressure (HTHP) apparatus is a most important instrument for studying deep earth processes and other HTHP experiments. But the apparatus with basic configuration require improvement. A new temperature and pressure automatic control system is present in the paper, and the system operating software is developed based on LabVIEW. The new control system realizes the pressure and the temperature working in the multi-mode, which improves the applicability. Experiment data and operating state are real-time displayed and recorded. The software has encryption protection and alert functions. Actual operation results show that the system has the good performance of following the setting curves and robustness.
Detection Sensitivity Based on Energy Detection in Cognitive Radio Systems
Authors: Yu Gui Cai , Long Cheng Zhi , Xiang Man Tian
Published: February 2012

Traditional energy detection algorithm is bad in anti-noise. In this paper, the relationship of energy detection performance and detection sensitivity with average noise power fluctuation in short time is investigated. Detection sensitivity drops quickly with the increment of average noise power fluctuation and becomes worse in low signal-to-noise ratio. To the characteristic, a new energy detection algorithm based on dynamic threshold is presented. Theoretic results and simulations show that the proposed scheme removes the falling proportion of performance and detection sensitivity caused by the average noise power fluctuation with a choice threshold, and also improves the antagonism of the average noise power fluctuation in short time and obtains a good performance. Detection sensitivity and performance improves as the dynamic threshold factor increasing.
One Method for Target Location Used in a Radar System Based on External Illuminator and Accuracy Analysis
Authors: Zhao Jie
Published: February 2012

An applicable passive location algorithm of target based on single fixed-site illuminator of opportunity is introduced in this paper. The azimuth can be acquired using DBF (digital beam formation) technique and angle-measuring via amplitude comparison. Based on Time Difference of Arrival (TDOA), the distance between the target and the radar station is achievable. Finally, the accuracy of location is analyzed, and the computer simulation results are presented.
Path Planning Research of Soccer Robot Based on Fuzzy Theory
Authors: Deng Jian Qiu , Hao Cui , Liu Yang
Published: February 2012

Aiming at the problem of path planning of soccer robot, based on the principle that the path curve should be smooth and the total length of the path should be short, the fuzzy control method to the whole velocity and the real-time rotational angle was proposed in this paper. The membership functions of fuzzy controller were optimized by golden mean principle. Simulating use the fuzzy control method and the fuzzy control method based on golden mean. Results show that the fuzzy controller optimized by golden mean has better control effect. Robot has better real-timing when avoiding obstacles. The global path will be shorter.
Study of the Minimization of Instantaneous Equivalent Fuel Consumption Control Strategy of HEV
Authors: Wang Peng Yu , Wang Qing Nian , Li Zhi Xuan , Zhu Qing Lin
Published: February 2012

A control strategy which based on minimum instantaneous equivalent fuel consumption was proposed in this paper. The important parameters that affected the calculation of instantaneous fuel consumption were analyzed. The important parameters include battery equivalent fuel consumption, penalty function to maintain the battery SOC and the revise of the regenerative braking energy. More precise expression of minimum instantaneous fuel consumption was deduced. Under the simulation platform of ADVISOR software, orthogonal optimization of parameters was performed and the range of important parameters in the optimization of expression was determined.
Sliding Mode Control of PMLSM for High Speeding Gringding Machine
Authors: Lu Hua Cai , Jiang Ming , Chen Qi Gong , Wei Li Sheng , Gao Wen Gen
Published: February 2012

Permanent magnet linear synchronous motors (PMLSM) offer several advantages over their rotary counterparts in many precision manufacturing applications requiring linear motion, which can achieve a much higher speed and a higher position accuracy. However, linear motors are more sensitive to disturbance and parameter variations. Furthermore, the linear motor systems are subject to significant nonlinear effects due to friction and force ripple. A sliding mode controller with an adaptive disturbance observer is processed to achieve high accuracy in the presence of external disturbance and parameter uncertainty. The position control for the gringding machine of a PMLSM feed drive using the proposed control strategies is illustrated. Simulation results show that the proposed controllers provide high-performance dynamic characteristics and are robust with regard to external load disturbance.
Ant Colony Algorithm Application In Glass Fiber Textile Machine Parameter Tuning
Authors: Zhang Li Hong , Chen Shu Qian , Bai Gui Zhi
Published: February 2012

In glass fiber textile process, non-axis volume cloth drive motor with glass fabric volume increases, increasing the pressure on the drive shaft, moreover, because of cloth non-axis volume makes the pressure in the process of change is evident, that causes the motor load changing constantly, the traditional PID control system controller cannot timely tracking response. In order to solve the problem which the control parameters optimizes, improves the system performance, proposed a new Ant colony algorithm PID parameters optimization strategy, this solution can combine characteristics that Ant colony algorithm can fast find the most superior parameter solution stably and PID can precise adjustment. In the control process, taken the PID parameters as a colony of ants, used to control the absolute error integral function as the optimization objective, dynamically adjust the PID control parameters in the control process, so as to realize the PID parameters on-line tuning.
Research and Development of CNC System of Screw Polishing and Grinding Machine Based on PMAC
Authors: Zhao Dong Xu , Hou Shou Quan , Bi Jun Xi , Wang Li Qin
Published: February 2012

This paper introduces current situation of varying screw machining, characteristics of PMAC2-PCI, researches open CNC system based on PMAC2-PCI, designs CNC system of screw polishing and grinding machine, including hardware design and software design. The system holds the advantage of fast machining speed, high control precision and high stability.
Compare the Dynamic Characteristics of Inlet and Outlet Throttle Speed-Regulating Hydraulic System
Authors: Yang Hong Yan , Hu Ge Jin
Published: February 2012

A comprehensive mathematical model of the hydraulic inlet and outlet throttle speed-regulating system was established that included most components’ dynamic characteristics such as the hydraulic cylinder, the throttle valve, the hydraulic pump, the relief valve. The simulink of matlab was used to emulate the equations. The system parameters for example throttle opening area, oil bulk modulus were analyzed how to influence the dynamic characteristics of throttle speed control system. How to correctly select circuit under working condition and how to improve equipment performance in the hydraulic system design are indicated through comparing the dynamic characteristics of inlet and outlet speed-regulating circuit.
Remote Condition Monitoring and Diagnosis Technology for Rotating Tower of Continuous Casting Machine
Authors: Jiang Quan Sheng , Li Hua Rong
Published: February 2012

To meet the requirement of condition monitoring and fault diagnosis for the rotating tower of continuous casting machine (RTCCM) in a steel-making plant, the technology of remote monitoring and diagnosis system (RMDS) for RTCCM is developed in the paper. The architecture of the system is presented, and the key techniques in the system implementation are discussed in detail, including the B/S structure, Java technique and Web diagnostic technique. The developed RMDS can implement truly portability and provide a good solution for designing a remote diagnosis system based on network environment. The outcome of locale running indicates that the system possesses complete function with reliable operation and friendly consumer interface.
The Chaotic Control with only One Controller Term of Josephson Junction System
Authors: Wang Ning Ning , Zhao Heng , Wang Xie Rui , Liang Hui Ting
Published: February 2012

For chaotic behavior appearances in Josephson junction of resistance-capacitor-inductor driven by the direct-current and in order to eliminate lateral oscillations of Josephson junction and dispel their adverse effect on the system performance or the working conditions of the system, the chaotic system of Josephson junction was analised. First, the complex dynamic characteristics of chaos were gave, including the phase trajectory map, Lyapunov index, bifurcation diagram. It proved the objective existence of chaos and the parameter range of the chaotic occurrence in Josephson junction system through the analysis of these characteristics. In order to eliminate chaos of the system, a new controller was designed, which contains only one controller term.. And it can control the system stability at the equilibrium point O(0,0,0). The results show that this method is effective, and constructing controller is simple, and the system after controlled has shorter dynamic response time and good robustness.
Intelligent Control of Fused Magnesium Furnaces with Neural Network and Rule Based-Reasoning
Authors: Wu Zhi Wei , Wang Chao , Wu Yong Jian , Chai Tian You
Published: February 2012

The smelting process of fused magnesium furnace is a huge energy consuming process with nonlinear, current coupling and boundary conditions fluctuation. The smelting process stability is guaranteed by adjusting the three-phase electrode currents to achieve the control objective. In the past, the adjustment of electrode currents are manual control completely and the control effect is very poor, the currents fluctuation is very huge which lead to the instability of the product quality and great energy waste. As such, an intelligent control system is developed for fused magnesium furnace based on neural network (NN) algorithms and rule-based reasoning (RBR). The control objective for system is to reduce the energy consumption as much as possible under the constraint of insuring the product quality. The industrial application shows the validity and effectiveness of the proposed system.
Research on Remote Optimization System for Key Parts of Large Scale Plastic Mold
Authors: Chen Meng , Chen Cao Wei , Wang Long Shan , Lu Ya Ping , Zhang Lei
Published: February 2012

A remote finite element optimization system for key parts of large scale plastic mold is described. The functions of the system are realized using ASP.NET, SQL Server database and ANSYS optimum design. The parameters of geometry, material, load, and optimization are input on the web page. The system can query material properties of the mold, such as modulus of elasticity and Poisson's ratio from the material parameters query system. The key parts of the large scale plastic mold are modeled parametrically by the ANSYS Parametric Design Language (APDL). The codes of parametric modeling are encapsulated on the server. The parametric model reads and optimizes these parameters by the remote server. The optimum result could be browsed on the web page. The system lowers the demands of the relative knowledge about ANSYS which the designer should have.
Topology Analysis of Vibrating Compacting System with the Hysteretic Characteristics of Materials Considered
Authors: Xin Li Li , Liang Ji Hui
Published: February 2012

Materials present elastic-plastic deformation under cyclical loading because of the influence of vibration friction, and restoring force and the displacement show hysteretic characteristics in compacting mechanism and materials system. To further study nonlinear dynamics of the vibrating compacting system, system model with symmetric hysteretic curve was established in this paper, and was verified by experiment. Bifurcation and chaos motion were studied in nonlinear vibrating compacting system by the combination of qualitative theory and numerical solution, and analysis results show that vibration have piecewise and singular characteristics in vibrating compacting system, and hysteretic loop parameters show significant influence on system and large effect on nonlinear dynamics of system.
Structure and Kinematics of Mechanisms for Position and Control from Farming Machine
Authors: Geonea Ionuţ Daniel , Margine Alexandru , Ungureanu Ali
Published: February 2012

The paper is structured in two parts. In the first part are presented some kinematics schemes used to the positioning and control systems, from the harvester machine structure, hydraulic excavators. In generally these mechanisms have two or three degree of mobility. It is presented those mechanism structures upon the base module. In the second part is presented the 3D model and the kinematical analysis results for one plane excavator mechanism, with the help of MSC.Adams computer program.
The Empirical Research of Energy Utilization Efficiency in Industrial Sectors Based on DEA-Malmquist
Authors: Lu Ming Xiang , Ma Guang Wen , Hu Yan Long , Wang Jing
Published: February 2012

This study selected Sichuan Province of China's energy production and consumption province as the regional research object. It studied energy utilization efficiency in industrial sectors from output of energy consumption, energy utilization technical efficiency, pure technical efficiency, and change index of energy utilization efficiency by the data of energy consumption and GDP. The output of energy consumption and energy utilization efficiency were big difference in industrial sectors. It provided the basis of taking different measures according to the different characteristic in industrial sectors while reducing energy consumption and energy conservation
A Survey on the Evolution of Nonconventional Pneumatic Actuators
Authors: Visan Alexandra Liana , Alexandrescu Nicolae
Published: February 2012

In this article will be presented the evolution of the nonconventional pneumatic actuators, in general Pneumatic Artificial Muscles known in the technical literature as PAM’s that were patented as well as their main operating principles and area of activity. These types of actuators have been applied in all kinds of applications from mechanical engineering, robotic, alimentary industry, special equipments, diagnostic medical devices and prostheses.
Increasing the Operating Safety of the Machine-Tools by Using Hydro-Pneumatic Accumulators. Modeling - Simulation
Authors: Prodan Dan , Bucuresteanu Anca , Balan Emilia
Published: February 2012

This paperwork presents the results of the theoretical and experimental research that has had as object of study the hydraulic installations with hydro-pneumatic accumulators. It presents simulations for determining the performance of some hydraulic safety systems designed for actuating brakes, for ensuring bearings lubrication when the circuit incorporating the pump fails and for lifting loads in emergency situation. A hydraulic installation designed for a grinding machine is presented at the end.
Multimode Vibrations Suppression Compensators Design Using Specified Dynamic Performance Reference Models
Authors: Rusu Marius Sebastian , Grama Lucian
Published: February 2012

This paper presents a method of designing vibration compensators for linear mechatronic systems based on their inverse multimodal representation and a customized second order transfer function embedding the specified dynamic behavior. The linear non-compensated system is modeled by a parallel connection of independent second order transfer functions. There are four flavors of compensators described in this paper, each having a different choice of the reference model parameters. A brief numerical example is also provided.
Optimization by Simulation of Fabrication in Manufacturing Robotized Systems
Authors: Dumitru Constantin , Contoloru Violeta Cristina , Popescu Daniel
Published: February 2012

This work proposes the optimization by simulation of fabrication in manufacturing robotized systems, designing in principle of a flexible fabrication cell composed of many modules (centering, turning, etc) for machining of a product family, cell that is to be operated by an industrial robot whose purpose is the handling of parts within it (transport of parts among the cell modules). The production task shall be reviewed first, within which the typological nucleus to be machined, using the mathematic theory of utilities. The next step consists in determining the static configuration of the MRS in order to set the type and number of modules-operation using the mathematic modeling. Through the method of fictive ranges it shall be calculated the cost of the flexible production systems and it shall be determined the spatial arrangement of processing modules from MRS.
The Model of Wax Precipitation and Experimental Validation
Authors: Zhang Bing Qiang , Xue Da Shuai , Yang Ji Cheng
Published: February 2012

A comprehensive review of literature concerning rheological property, and wax deposition during involving the pipeline safety problems is presented. The deposition and gelation of waxy oil pose great flow assurance risks, especially in submarine oil pipeline. Even though there have been a lot of studies and breakthroughs in understanding the wax precipitation and deposition in the past few years, there still continue to be some challenges that have remained unsolved. In order to well understand the rheological property of the crude oil, First of all, the issue need to be solved is study the wax precipitation property of the oil. In this paper, an accurate model of wax precipitation in laboratory condition undergoing a cooling process is established. And then we predicted the wax appearance temperature, pour point and the weight of the wax appearance about the oil sample. Here, the calculated results of model are much close to the experimental values, which shows that the model of wax precipitation developed is correct and reasonable. By accurate prediction the WAT, pour point, we can well understand the rheological property, which will help the operators make an impeccable flow restart plan for the planned or emergency production shut-down of waxy oil pipelines
Using the Web by Finnish SME’s for Corporate Social Responsibility Activities
Authors: Lakatos Elena Simina , Gazdac Roxana Mirela , Dan Viorel
Published: February 2012

The Web is evolving, so the Internet is the cheapest mean of communication, is essential in today’s world, for all these reasons the article discusses its implications, more interesting for Finnish SMEs that still do not use or ignore the Internet. Facing more and more acute challenges, worldwide, such as vulnerability of the internet network, the moral side of knowledge management or the relationship between human and artificial intelligence involves the individual and collective actors, animated features not only from intellectual aspiration to new discoveries, but what we might call “the ethics of the responsible legitimacy.” Therefore, this study has analyzed the availability of these companies’ websites and the manner they communicate their corporate social responsibility (CSR) activities, in order to have a full picture of CSR online communication of SMEs in Finland.
Mechanical Loading of R-R-T Dyade
Authors: Ilincioiu Dan , Miriţoiu Cosmin Mihai , Jimenez Juan Pablo , Roşu Cătălin
Published: February 2012

In this paper we present a mathematical model able to calculate the section forces that act upon the elements of the RRT dyade, in order to facilitate the required strength check-ups.
On Improving the Performances of Hydraulic Incremental Positioning Units with Mechanical Position Feedback
Authors: Bucşan Constantin , Avram Mihai
Published: February 2012

This paper presents a method for increasing the speed and the positioning accuracy of the positioning systems with mechanical position feedback. The method consists in using a position transducer for real time determination of the position of the load and correcting this position using an adequate algorithm. It is preferable not to modify the construction of the positioning unit, allowing the user to decide when to use this correction method according to the practical application. An interesting solution to this problem is to use an external space-position finding sensing system, as presented in the paper.
Problems of Loading Capacity of Suction Cups in the Radial Direction
Authors: Novotný František , Horák Marcel
Published: February 2012

The paper submits a computer analysis of a vacuum gripping element, a suction cup with the rigid supporting plate, loaded radially. Results of the computer simulation are used when designing new vacuum gripping elements which have a function of a controlled modification of the friction behaviour and adhesive properties of the element contact surface with a view to increase a carrying capacity in the radial direction keeping the vacuum levels used standardly. The designed vacuum elements will be used for technologically demanding processes during flat glass working having only limited energetic connection with their vicinity, and also for robotized handling objects of the plate design. A next field of application will include an induction of hold-down forces in climbing of service robots on glass facades of high-rise buildings [1, 2].
The Design and Implementation of Integrated Backup System for EMS Base on the Cloud Computing Technology
Authors: Yuan Rong Chang , Li Li Xin , Li Qiang , Di Fang Chun , Zhu Yu Kun , Li Zheng Jiang
Published: February 2012

With smart power grid put forward, establishing disaster backup system is in urgent need to improve the reliability and tolerance. The paper presents an evaluation model of EMS backup system constructing, Indicates the priority of the integrated inter-backup solution through establishing the backup system analyzing evaluation model. Analyse and Discuss the key technologies of cloud computing in integrated backup system.Base on the distributed storage technology of cloud computing, construct the EMS integrated inter-reserve solution, saving the cost greatly in the premise of ensuring the reliability of backup system.And then implemented it by using cloud computing technology
The Dynamic Behavior of the Elevation Movement Mechanism of One Transfer Manipulator with Electro-Hydraulic Acting
Authors: Cristescu Corneliu , Drumea Petrin , Dumitrescu Liliana , Ilie Ioana , Chiriţă Constantin
Published: February 2012

The paper presents the results following the theoretical research of one vertical elevation mechanism regarding the dynamic behavior for one modern transfer systems, a manipulator or robot in cylindrical co-ordinates, which belongs to a molding technological module based on the hydraulic presses. Using the mathematical modeling and the computer simulation, it can identify the parameters with sensitive behavior and, finally, it can optimize the dynamic regimes according to the real requests of driving.
Effect of 7050 Aluminium Alloy Microstructure on Residual Stress by Laser Shock Processing
Authors: Zhang M.L. , Wang J.M. , Jiang Y.F. , Zhang Q.L. , Zhou Q.L.
Published: February 2012

The solution treatment and solution and aging treatment (T6) were disposed on 7050 aluminium alloy, then local processed by laser shock processing (LSP) with high-rate neodymium glass laser. The microhardness and residual stress on the surface of 7050 aluminium alloy were tested, then how the microstructure influences the residual stress on the surface of 7050 aluminium alloy by laser shock processing was analysed. The results show that the microhardness and residual compressive stress on the surface of 7050 aluminium alloy treated by solution and aging treatment was higher, and decreased obviously treated by solution treatment; the microhardness and residual compressive stress on the surface of 7050 aluminium alloy increased obviously by solution treatment and solution and aging treatment after laser shock processing; treated by solution treatment and solution and aging treatment, the microhardness and residual compressive stress of the material with uniform original structure was higher than the material with nonuniform original structure.
Macroporous Silicon Fabricated by HF Electrochemical Etching for Antireflective Application in Solar Cells
Authors: Ou Wei Ying , Zhao Lei , Li Zhao Chen , Diao Hong Wei , Wang Wen Jing
Published: February 2012

Macroporous silicon was fabricated by electrochemical etching in hydrogen fluoride (HF) electrolyte on P-type silicon wafers. By optimizing the etching condition, the obtained macroporous silicon presented pore diameter of about 2 μm and pore density of ~107/cm2. Such macroporous silicon gave out an excellent antireflective performance with the reflectance lower than 4% in a wide spectral range of 400-1000 nm. An a-Si:H/c-Si heterojunction solar cell was fabricated on such macroporous silicon to show its application potential.
Reducing Microbially-Influenced Corrosion on Aluminum by Using Organosiloxane Sol Film with Silver Nanocrystals
Authors: Yin Bing , Liu Tao , Dong Li Hua , Zhang Li , Yin Yan Sheng
Published: February 2012

Silver nanocrystals were encapsulated in mesoporous silica nanoparticles (Ag-MSN) to increase stability and enhance anti-bacterial potency. The morphology of the nanoparticles was characterized by scanning electron microscopy and transmission electron microscopy. X-ray diffraction analyses proved that the silver nanocrystals were truly embedded in the mesoporous silica nanoparticles. Electrochemical impedance spectroscopy was carried out to evaluate the effect of organosiloxane film containing Ag-MSN on reducing microbiologically influenced corrosion. The excellent corrosion resistance property showed that the sol film containing Ag-MSN could significantly decrease the V. natriegens adhesion and protect the aluminum against microbiological corrosion in seawater.
Nondestructive Evaluation of Material Damage Using Nonlinear Rayleigh Waves Approach
Authors: Shui Guo Shuang , Wang Yue Sheng
Published: February 2012

A nonlinear Rayleigh wave approach is presented for nondestructive evaluation of material damage in this paper. Rayleigh waves are experimentally generated and detected with wedge transducers, and the nonlinear parameters are measured at different stress levels for AZ31 magnesium alloy plate specimen. By experimental way, it is observed that there is a direct correlation between the acoustic nonlinearity measured with nonlinear Rayleigh waves and the level of plasticity. The result shows that there is a significant increase in the nonlinear parameters at monotonic tensile loads above the material’s yield stress, and it demonstrates the effectiveness of the proposed experimental procedure to track the surface damage in alloys.
A New Approach to Popov Criterion for Stability Analysis of Nonlinear Control Systems
Authors: Svarc Ivan
Published: February 2012

The Popov criterion for the stability of nonlinear control systems is considered. The Popov criterion gives sufficient conditions for stability of nonlinear systems in the frequency domain. It has a direct graphical interpretation and is convenient for both design and analysis. In the article presented, a table of transfer functions of linear parts of nonlinear systems is constructed. The tables includes frequency response functions and offers solutions to the stability of the given systems. The table makes a direct stability analysis of selected nonlinear systems possible. The stability analysis is solved analytically and graphically. Then it is easy to find out if the nonlinear system is or is not stable; the task that usually ranks among the difficult task in engineering practice.
Application and Research on the Model of Saturated-Unsaturated Porous Material Coupling Hydro-Thermal-Mechanical Process
Authors: Xu Yu Hang , Liu Chang Wu
Published: February 2012

The study of hydro-thermal-mechanical process coupling in unsaturated porous material is very important due to its close relationship with environmental geomechanics engineering. The model established upon the deforming porous material mechanics is analyzed in this study. This model takes into consideration the phase change and heat effects. Four balance equations associated with four state variables including gas pressure, capillary pressure, temperature and displacement are imposed. Besides, the governing equations are discretized with the selected Galerkin method and the program has been developed. Using this program simulates two experiments, which representing the saturated non-isothermal consolidation phenomenon and rainfall experiment respectively. The results revealed that this multi-field coupled model is a useful tool to analyze the porous material that coupled with hydro-thermal-mechanical process.
Classification of Power Quality Problems by Wavelet Fuzzy Expert System
Authors: Karthik N. , Gafoor Shaik Abdul , Surya Kalavathi M.
Published: February 2012

Electric power quality, which is a current interest to several power utilities all over the world, is often severely affected by harmonics and transient disturbances. There is no unique model which can assess the power quality problem and to identify and classify them properly. Existing automatic recognition methods need improvement in terms of their versatility, reliability, and accuracy. The FUZZY LOGIC based tools have been applied for the PQ classification. This paper addresses Power quality problem classification by wavelet and fuzzy expert system. Major Key issues and challenges related to these advanced techniques in automatic classification of PQ problems are highlighted. New intelligent system technologies using DSP, expert systems, AI and machine learning provide some unique advantages in intelligent classification of PQ distortions
Contribution to Stability Control of Nonlinear Systems
Authors: Svarc Ivan , Matousek Radomil
Published: February 2012

The most powerful methods of systems analysis have been developed for linear control systems. For a linear control system, all the relationships between the variables are linear differential equations, usually with constant coefficients. Actual control systems usually contain some nonlinear elements. In the following we show how the equations for nonlinear systems may be linearized. But the result is only applicable in a sufficiently small region in the neighbourhood of equilibrium point. The table in this paper includes the nonlinear equations and their the linear approximation. Then it is easy to find out if the nonlinear system is or is not stable; the task that usually ranks among the difficult tasks in engineering practice.
Hydraulic Positioning Unit with Internal Mechanical Position Feedback
Authors: Avram Mihai , Bucşan Constantin , Duminică Despina , Constantin Victor
Published: February 2012

The paper presents the actual stage of hydraulic positioning units with external mechanical position feedback and proposes an original design of a hydraulic positioning unit with internal mechanical position feedback, developed by the authors. The design of the positioning unit is discussed in order to obtain a compact system with low sizes, the built experimental model is described and some results of a first set of experimental tests are presented.
Identification of Tight Spots to an Automatic Mechanical Assembly Line, by Simulation WINQSB
Authors: Popescu Gheorghe , Ghimişi Stefan
Published: February 2012

In this work the authors present the result of the theoretical researches and experiences concerning the identification and elimination of the tight places in the automatic montage of the electric ignition devices used in the pyrotechnic industry for improving the labour productivity. Taking into account the fact the above production system is an expectation system depending on a theoretical study followed by computer simulation with the data processing product WINQSB, Queing System Simulation module, we identified the tight places that generate expectation queues when remaking, verifying and assembling the electric ignition devices of the indigenous electric detonators. In this way, using the WINQSB simulation, we offered solutions for 3 analysis types: the ensemble and marks analysis which entered the system, the analysis of the working machines using and the analysis of the queues.
Research on Engineering Machinery Manufacturing PDM and CAD Integration Solutions
Authors: Zhao Chang Rong , Guo Xiong Hua , Zeng Xiang Long
Published: February 2012

In the construction machinery manufacture enterprises, the diversified users, individual needs and various products purchasing manners become the market mainstream. Based on the common problems existing in the informatization implementation of current construction machinery manufacture enterprise, this paper focuses on the product design characteristics and production management in construction machinery industry, relies on advanced design and manufacturing technology, modern management technology and information technology, combines with the results and experience of enterprise informatization, analyzes the bottleneck of enterprises and proposes the general plan the construction manufacture enterprise implement information through analyzing the information needs in construction machinery industry and actual situations, also proposes PDM and CAD integration programs according to the situations of PLM software functions and enterprise graphics software.
Research on the Vacuum Attachment System of a Cleaning Robot with Vertical Displacement
Authors: Alexandrescu Nicolae , Udrea Constantin , Duminică Despina , Apostolescu Tudor Cătălin
Published: February 2012

Autonomous mobile robots for vertical surface cleaning have to support their own weight, fixing elements most frequently used being vacuum cups. An original construction of a cleaning robot with displacements in a vertical plane and vacuum attachment system was developed by the authors. The paper presents the most important results of the research performed in order to establish the behavior of vacuum cups used for coupling to the supporting surface in the presence of external loads.
Robot - Turner
Authors: Mikolajczyk Tadeusz
Published: February 2012

Paper describes the robot equipped with turning tools holder mounted to robots head. Was used head rotation to the tool changing. Robot collaborated with lathe which positioned in plane of robot’s arm moving. Coordinates x and z of robot are used to control of turning. Controlled by PC machining of the workpiece was made with G-code using. Presented system was used to wood turning.
Torque Control and Pitch Control Strategy in VSCF Wind Turbine above Rated Wind Speed
Authors: Ma Rui , Hu Shu Ju , Fu Xun Bo , Xu Hong Hua , Li Nian Hong
Published: February 2012

Above rated wind speed, the wind turbine speed and output power are maintained near the rated values through the coordinative control of torque and pitch angle. Due to the non-linear behavior of the wind turbine, the traditional PID control is not effective in the pitch control. And accurate mathematical model of wind turbine is very difficult to get. In order to solve the problem, the fuzzy adaptive tuning PID control algorithm is proposed in the paper. About torque control strategy, constant torque control mode and constant power control mode are simulated respectively. Based on the analysis and comparison of the advantages and disadvantages of both modes, a mix control mode is proposed in order to give consideration to both torque and power. Simulation was carried out with the proposed torque control and pitch control strategy in MATLAB and GH Bladed software. The results proved that output power is optimized and the response of the wind turbine is good
Using the Microcontroller and the PLC in a RPP Robot Control
Authors: Bogdan Laurean
Published: February 2012

This paper presents some aspects regarding the possibility of combining microcontroller and programmable logic controller (PLC) for robot control. The RPP robot is designed and manufactured within the Faculty of Engineering from “Lucian Blaga” University of Sibiu, as a patent: BRAŢ TELESCOPIC, Nr. 112418 B1, Int.CI.6 B 25 J 18/02, from 17.02.1997. Classical systems for programming and control of industrial robot are based on numerical control equipment, developed around a PC. Programmable Logic Controllers (PLC) haves proven to be viable alternatives to driving machine tools, industrial systems and Robots. Microcontrollers as computers offer advantage due to programmable inputs and outputs ports. The application of a microcontroller and PLC in control of a robot is presented in this paper.
Synthesis, Characterization, and Electrochemical Properties of Mn3O4/Cr2O3 Composite
Authors: Ran Fen , Wang Ling Ren , Zhao Lei , Tan Yong Tao , Kong Ling Bin , Kang Long
Published: February 2012

Mn3O4/Cr2O3 composite materials were prepared by a chemical coprecipitation method. The structures were characterized by using SEM and XRD, and the supercapacitive behaviors of these composite materials were investigated with cyclic voltammetry (CV) and charge–discharge tests. Morphology of Mn3O4/Cr2O3 composite materials showed that the Mn3O4/Cr2O3 composite materials containning a small amount of Cr2O3 has a better dispersion compared with that containning a lage amount of it. Owing to the higher surface area and poor crystallization, the Mn3O4/Cr2O3 composite materials containning a small amount of Cr2O3 show much higher specific capacitance (The highest specific capacitance value of 494 F/g was obtained), and were more promising for applications in supercapacitors.
PLM System for Complex-Shape Aircraft Gas Turbine Parts
Authors: Ionescu Mircea Dan , Marin Doina , Predincea Nicolae
Published: February 2012

The complex modeling and coordination program has been developed based on quality standards that are in line with the quality requirements specific to the production of turbojet engines and assures the guarantees and confidence of our European Partners in our ability to take part in complex international projects with high levels of scientific and technological difficulty. A particular feature of the project is the quality system integration. For this purpose, the hardware of the existing machine tools is modified to assure the active control of parameters and a report is issued on the actual parameters. The report printed on a barcode card accompanies the component throughout the technological workflow, assuring the traceability of the component history, and a quality report is issued.
The Influence of Annealing Temperature on ZnO Thin Films by Oxidating Zinc Films Deposited with Magnetron Sputtering
Authors: Sun Hai Bo , Sun Zhen Cui , Xue Cheng Shan
Published: February 2012

Zn films were prepared on Si (111) substrates by radio frequency magnetron sputtering system, which were subsequently annealed at different temperature in O2 ambient. Their microstructure, morphology, composition and optical properties, particularly as a function of annealing temperature, were studied by XRD, SEM, FTIR, XPS and PL characterizations. All the results show that the crystal quality of ZnO film can be improved by increasing annealing temperature, and the optimum annealing temperature is 800°C in our experiment. The XRD and SEM results show that the ZnO films have a hexagonal structure with cell constants of nm and nm under the optimum experimental conditions. The FTIR and XPS results further confirm hexagonal structure of ZnO. The PL result shows that best UV and green light emission are found in the samples annealed at 800°C.
Effect of Fluorine Content on the Electrochemical Properties of PVDF-Derived Carbons for Lithium Ion Battery
Authors: Shi Lu , Miao Chao Lin , Chen Gai Rong , Xu Bin , Chen Shi
Published: February 2012

The carbon materials prepared by PVDF carbonization at different temperatures have similar BET surface area and pores volume. The content of fluorine in the carbons decreased with the carbonization temperature from 1.46% (atm %) at 600°C to 0.18 %( atm %) at 1000°C. The first cycle specific capacity and the initial coulombic efficiency decreases with the decrease of fluorine content in the samples. The first cycle discharge capacity decreased from 982 mAh/ g at 600°C to 752 mAh/ g at 1000°C and the initial coulombic efficiency decreased from 31.8% at 600°C to 24% at 1000°C. It is believed that fluorine contained in the carbon materials has a positive effect to improve the electrochemical properties as anode materials for Li-ion batteries.
Effect of Poly(vinyl alcohol)/Chitosan Ratio on Electrospun-Nanofiber Morphologies
Authors: Jamnongkan Tongsai , Wattanakornsiri Amnuay , Pansila P. Pungboon , Migliaresi Claudio , Kaewpirom Supranee
Published: February 2012

Series of poly (vinyl alcohol)/chitosan (PVA/CS) electrospun nanofibers with different weight ratio of PVA and CS were fabricated by electrospinning method. The surface morphology, diameter, and structure of electrospun nanofibers were investigated by scanning electron microscopy (SEM). As a result of PVA and CS composition measurements, the electrospun nanofibers morphologies were mainly affected by weight ratio of the polymer solution. When increasing the chitosan content in the blend solution, the electrospun nanofibers could hardly form. This result indicates that the electrospun nanofiber formation is enhanced by chitosan content.
Hydrogen Generation from CDS Modified-Titania Nanotube Arrays
Authors: Chen Ygin Chieh , Liou Jia You , Lan Wen Jie , Chen Jyun Yu , Wang Hong Wen
Published: February 2012

A heterogeneous structured photo electrode using CDS -modified TiO2 nanotube arrays (TNA) was fabricated. The CDS nano particles were precipitated by immersing TNA into NaS and Cd (ClO4)2solution, where the number of immersion gave different amount of CDS precipitates. The effect of CDS on the performance of photochemical cell of TNA was evaluated. FESEM, EDS, XRD and UV-Visible were employed to characterize the structures and properties of CDS -modified TNA heterogeneous structure. The water splitting experiments were carried out using these CDS -modified TNA under standard AM 1.5 solar illumination (100mW/cm2>). An optimum hydrogen generation rate of 20.61μmole/cm2>)h (~0.50 ml/cm2>)h) was obtained. It was considered that the smaller band gap of CDS rendered the electrons a rapid transportation to the TiO2nanotube arrays and the recombination of electron-hole was therefore effectively prevented. In summary, the CDS nano particles were effective in promoting the catalytic effect of TNA for hydrogen production.