bluuebunny/crossref_metadata_2025 huggingface dataset:
Vibration Control of Sandwich Plates
Authors: Basa B. , Sarangi Saroj K.
Published: August 2014

This paper presents the active control of vibrations of sandwich plates using piezoelectric composites (PZC). The top surface of the plate is integrated with the patches of active constrained layer damping treatment. Active fiber composite, one of the commercially available PZCs, is used as the material of the constraining layer of the patches and the constrained layer of the patch is composed of a viscoelastic material. Considering the ﬁrst order shear deformation theory individually for each layer of the sandwich plate, a three-dimensional finite element model has been developed. The performance of active fiber composite for the smart vibration control of the sandwich plates has been studied and numerical results are presented. Emphasis has also been placed on investigating the effect of variation of piezoelectric ﬁber orientation angle in the constraining layer on the control authority of the patches.
Vibration Analysis of Multi-Disk Multi-Profiled Shaft-Rotor Systems
Authors: Asdaque P.M.G. Bashir , Behera Rabindra K. , Shaik Jakeer Hussain
Published: August 2014

Cantilevered shaft-rotor systems consisting of multi disks and multi profiled shafts are considered. In this paper the procedures for the determination of the deflection, slope, shear force and bending moment at the extremities of the shaft are employed. Critical speeds or whirling frequency conditions are computed using transfer matrix method (TMM). For particular shaft-lengths, rotating speeds and shaft-profiles, the response of the system is determined for the establishment of the dynamic characteristics. A built-in shaft-rotor system consisting of two disks and two different profiled shafts is investigated for illustration purposes. Step response of the multi profiled shaft-rotor system is also found out.
Ecofriendly Refrigerants
Authors: Pandav Prashant P. , Lokhande S.B. , Barve Shivprakash B.
Published: August 2014

The depletion of ozone layer and green house effects are worldwide problem. Refrigerants are part and source of depletion of ozone layer. As we using these Ecofriendly refrigerants then harm to ozone reduces. These are best option for recently running refrigerants. Eco-friendly refrigerant like hydroflurocarbons and hydrocarbons are replacing chlorofluorocarbons application.CFC is the most important member of CFC refrigerants. This paper, gives alternate to refrigerants that are causes ill effect on environment. Their performance with respect to recently used refrigerant compared. By this comparison benefits of Ecofriendly refrigerants discussed.
Scavenging of Nickel(II) from Aqueous Wastes by Adsorption with Granular Activated Carbon (GAC)
Authors: Gawhane Supriya
Published: August 2014

Due to explosive growth of industrial and agricultural activities, there is rise in pollutants in water including heavy metals and toxic elements. In light of increasing pollution load of environment it is imperative to address this problem by different approaches and means.Of the numerous unit processes, evaluated to control pollution, to a degree, adsorption by GAC is one of the best available broad spectrum technologies. Scavenging of a precious metal such as Nickel, present in aqueous systems can be carried out with or without use of carrier such as 8-hydroxyquinoline (Oxine) and its derivatives on various grades of as received activated carbons. The carrier improves uptake of metal ions by GAC. The adsorption process agrees with the Langmuir and Freundlich models and also obeys pseudo-second order kinetics.
Vibration Analysis of Simply Supported Magneto Rheological Fluid Sandwich Beam
Authors: Kolekar Shreedhar
Published: August 2014

Vibrations are unwanted in most of the day today usage especially in mechanical machines, civil structures, aerospace industries and automotive parts. It is usually to get the rid of these vibrations by using magneto rheological fluids. A magneto rheological fluid provides viscous damping which gets added up when magnetic field is applied. The damping properties of fluid get multiplied and natural frequency of the body under observation also changes, using this technique the three layered MR fluid sandwich beam was fabricated and tested it for undamped and damped conditions. The controllability of variations in the various dynamic parameters like natural frequencies, vibration amplitudes and damping factors was observed.
Keywords: Magnetorheological fluid, MRFluid sandwich Beam, Natural frequency, Damping factor, Damping coefficient.
Investigation of Transverse Surface Crack on Vibration Analysis of Rotating Shaft
Authors: Waikar Hemant G. , Katekar S.D.
Published: August 2014

For many years crack identification methods have been studied by number of researchers. The development of crack changes dynamic behavior of rotor system. It decreases the strength of object or material. Timely detection of a shaft crack by efficient condition monitoring system would avoid severe damage and expensive repairs due to failure of rotating machinery as well as assure the safety of personnel. The shaft crack is one of the most serious faults in high speed rotating machinery. It is important to detect them before they reach the critical size and cause total failure of the shaft. Hence attention to the study of rotating shaft with crack is required. This paper gives the general introduction to the vibration analysis method for crack detection with experimental set up. From software analysis it has shown that due to crack shaft gives different deformation values for different natural frequencies.
Design Considerations for Automobile Chassis for Prevention of Rolling over of a Vehicle
Authors: Rajpal Jatin , Thorat Sandeep G , Kothavale Basavaraj S , Hatwalane Swapnil S
Published: August 2014

The first part of this paper deals with the structural analysis of automobile frame and design modification to reduce weight of the chassis, the second part is the study of rolling over effect and the multiple axle drives with active bogies for chassis levelling and the final part is the implementation of the active bogies and multiple axle drives for the prevention of rolling over. A method has been suggested to overcome the rolling over by design modification of the chassis. Active weights are used in order to prevent the rolling over of a vehicle.
Parametric FEA Analysis of Double Flexural Manipulator for Precision Application
Authors: Khan Zeba , Zambare Hrishikesh , Deshmukh Suhas , Shinde Abhijeet
Published: August 2014

A Flexural mechanism uses flexibility of material for desired motion objectives. As compared rigid-body mechanisms where actuations are applied at the joints connecting rigid links, the manipulation of the Flexural mechanism relies on the deflection of internal flexible members. Flexural mechanisms have no relative moving parts (and thus involve no wear, backlash, noise and lubrication), are relatively compact in design as compared to rigid link mechanism. Double Flexural Manipulator (DFM) is basic building block for planar flexural mechanism. This paper explains working principle of DFM and its parametric modelling. DFM has three basic parameters which decides range of motion, actuator requirement (Peak force and continuous force). In this paper Parametric FEA analysis is carried on DFM and verified with Analytical Model. This parametric modelling can be further used for designing and developing a flexural mechanism for precision applications.
Thermal Mechanics Based Energy Efficient FIR Filter for Digital Signal Processing
Authors: Pandey Bishwajeet , Kumar Tanesh , Das Teerath , Islam S.M.M. , Kumar Jagdish
Published: August 2014

Thermal mechanism cover the mechanics of Hit Sink, Airflow mechanics, and Ambient Temperature Mechanism to reduce junction temperature in design of Finite Duration Impulse Response (FIR) Filter. In this work, we are implementing FIR Filter on 28nm FPGA. After implementation of FIR Filter, we analyze the effect of in-built mechanism of Air Flow Controller and their produced Airflow on the junction temperature of FPGA. The mechanism of Ambient Temperature controller also play significant role in leakage power dissipation as well as junction temperature of FPGA. Finally, the mechanical structure of Hit Sink is considered for control of junction temperature of FPGA. There is 73.38% reduction in Leakage Power on 55 C ambient temperature when we increase airflow from 250 LFM to 500 LFM. Along with 500 LFM airflow, if we provide high profile hit sink then there is 78.31% reduction in leakage power. There is 37.68% reduction in junction temperature of FPGA when we increase airflow from 250LFM to 500LFM. Along with 500 LFM airflow, if we provide high profile hit sink then there is 41.76 % reduction in junction temperature on 45C ambient temperature. There is no effect of airflow on clock power. Whereas there is significant reduction in Logic Power, Signal Power, DSPs Power and IOs Power with change in Airflow.
Output Power Comparison of TCT & SP Topologies for Easy-to-Predict Partial Shadow on a 4×4 PV Field
Authors: Pareek Smita , Dahiya Ratna
Published: August 2014

The power generated by solar photovoltaic system depends on insolation, temperature and shading situation etc. These days’ solar PV arrays are mainly building integrated. Therefore PV array are often under partial shadow. The feature of these shadows can be either easy-to-predict (like neighbour’s chimney, nearby tree or neighbouring buildings) or difficult-to-predict (passing clouds, birds litter).Thus output power obtained by PV arrays decreases in a considerable manner. In this paper, output powers, currents and voltages for SP & TCT topologies are calculated for different patterns of easy-to-predict partial shading conditions on a 4×4 PV field.
Multi-Objective Optimization of Photochemical Machining Process Based on Grey Relational Analysis Method for Spray Etching
Authors: Agrawal Devendra , Gurav K.V. , Kamble Dinesh
Published: August 2014

Non-conventional process like Photochemical Machining (PCM) is found to show a promise for machining very thin metal components. In the present study, the effect of various selected parameters such as time of etching, temperature of etchant and concentration of etchant on material removal rate, undercut in PCM of phosphor bronze has been investigated by using multi-objective grey relational analysis and their optimal conditions are evaluated. Full factorial (L27) orthogonal array (DoE) has been used to perform the experiments. GRG value indicates most significant parameters affecting the PCM process. The above factors are selected on the basis of effect - cause analysis and literature survey. Mathematical models relating to the machining performance and machining parameters have been formulated. Optimal settings for each performance measure have also been obtained. The results obtained after conference test prove that improvement in the quality will take place is if the setting of parameters are done at optimum level predicted by multi-objective grey relational analysis. The ANN model is prepared to predict the result by training neural which can be compared with actual experiments to confirm the satisfactory performance during the experimentation.
Multi-Devices Application with Industrial Robot
Authors: Sukop Marek
Published: August 2014

Application was designed for exhibition purposes. It is a human – robot communication via mobile phone or tablet with Android. Moreover, there is also a link with the camera system. First, it explains the algorithm application. Furthermore, in the article is a description of five software applications that have been developed the system to work.
Construction of a Rescue Robot: Robotic Arm Module
Authors: Orság Filip , Drahansky Martin
Published: August 2014

This article describes mechanical construction and electronic equipment of a rescue robot developed at the Brno University of Technology, specifically the robotic arm module. Modular design of the body and electronics allows full support of the operator and choice of the appropriate set of sensors for the given task (rescue action in the avalanche, debris or damaged house). One of the modules is a robotic arm module. The arm is a 3 degrees of freedom device able to carry up to 2 kg of load in the fully stretched position. It incorporates two brushless drives to rotate the joints of the arm and a servo drive to rotate the platform.
Autonomous Parking of Small Vehicle
Authors: Šlapák Viktor , Bačík Ján , Pajkoš Michal , Lacko Milan
Published: August 2014

The paper is dedicated to parallel parking maneuver description. Parking maneuver is based on movement along two circles. Maneuver is experimentally verified on physical model of vehicle.
Robotic System Design with CA System Support
Authors: Javorova Angela , Kusa Martina
Published: August 2014

This paper deals about robotic system design. The design process is realized by CA systems in virtual robotic laboratory. These CA systems allow implementing the robotic system design graphics layout and simulating the control and robot movement in virtual platform.
Analysis of Flow Rates in the Design of Effector for Unilateral Gripping with Active Vacuum Suction Cup
Authors: Šidlovská Ľuboslava , Tuleja Peter
Published: August 2014

This article deals with the problems of the need for the required volume and flow rate in the circuit with underpressure in the design of the gripping effector with active suction cups. It presents a process of designing a vacuum generator which is required to power such effector so that it guarantees a quick and secure fixation of handling objects (OM) at handling it with a robot. The article displays a means of determining of so-called evacuationtimes in the process of gripping of OM during the handling tasks.
Design of Module for Robots Preliminary Calculation
Authors: Jánoš Rudolf
Published: August 2014

Article deals with the methodology of designing modules, which use is expected particularly in the industrial and service robotics handling superstructures. The article describes a methodology to preliminary calculations by which it is possible to speed up the design process drives. Since the proposal drives occurs in the early stages of the proposal for which no clear information about the structure of the module, this methodology helps us to appropriate power components.
New Standard in Scanning of Welding Electrodes by Using Visualization
Authors: Tolnay Marian , Hajduk Mikuláš , Bachraty Michal , Králik Marian
Published: August 2014

This article discusses the use of machine optical vision in the control of tip of welding electrodes for resistance spot welding. The aim of the research was carried out to design a fully functioning device for the assessment of immediate functional area of dimensional quality welding tip using the visualization process. The main objective of this work was the proposal of sensing device which satisfies the conditions of functionality, high precision, rapid assessment, reliability, minimum dimensions, production costs and maintenance costs. The launch of the device is the ability to reach a comprehensive solution in production, such as planning the appropriate exchange of tips electrodes, evaluation of area before and after renovation. The output is to ensure a longer lifetime of tips thereby reducing production costs.
Application of Hot Gas Powder Sintering in Robotics
Authors: Ondrej Staš , Gondár Ernest , Martančík Marek , Buranský Mário
Published: August 2014

The work describes the application of hot gas powder sintering using robotic positioning system with special equipment, designed for this new way of manufacturing technology. Material used for this type of sintering is recycled dust portion of PET plastics, which proposes potential possibility of costs reduction for this kind of production technology, which is focused on the use unusable materials. This opens new potential trends in robotics application, even in a new technology, suitable for rapid prototyping in mechanical engineering. It is sintering of the plastics powder using hot gas, usually nitrogen or any inert gas, to propose the best material structure without any deformation.
A Prototype of a Bitmap CNC Engraver
Authors: Batmend Mišel , Perdukova Daniela , Fedor Pavol
Published: August 2014

The proposed paper deals with two main ideas. The first is focused on design and realization of CNC engraving machine prototype where are described the principles of its mechanical construction focused on measurements of an electromagnetic diamond percussion tool prototype used for stone engraving describing its basic features and potential applications. The paper includes also chapters about electrical connections design and software/firmware implementation. The second part presents design and implementation of new algorithm for searching the shortest path connecting all bitmap pixels that need to be engraved with respect to specific constraints given by hardware of bitmap CNC engraver. New algorithm considered as a heuristic approximation of Hamiltonian shortest path was implemented and tested on a real prototype of a bitmap CNC engraver. Results of experiments are listed. Concerning a set of 17 real-life bitmaps, the new algorithm saves from 7% up to 17% of overall engraving time compared to original line-by-line tool path.
Industry as a Key Factor for Economic Recovery and Competitiveness of the Europe
Authors: Kyseľová Viera
Published: August 2014

Promotion of an integrated approach for industrial policy at European and national levels is crucial to ensuring the future competitiveness of the European Union and to raise growth potential. Essential for economic success and economic recovery of the European Union is an integrated single market, which creates an attractive environment for business, production of goods and services. Industrial modernization, investing in innovation, new technology, production inputs and skills, increased productivity, efficient use of resources and goods and services with high value added are prerequisites for achieving Europe's comparative advantage in the global economy. The main source of industrial future and competitiveness of the European Union are becoming investments in innovation and key technologies that redefine global value chains, make more efficient use of resources and redesign the international division of labor.
Motion Coordination of Two Robots in Cartesian Space Based on Mechanical Impedance
Authors: Slota Adam
Published: August 2014

Coordinated motion of two robots in Cartesian space is considered in the paper. Coordinated trajectory is generated as the sum of two motions: programmed and corrective. The corrective motion aims at limitation of the interaction force between robots. For calculation of the corrective motion speed the idea of mechanical impedance is used. As a measure of force interactions between robots change of distance between robots TCPs is used. Simulation experiments carried out for one dimensional case show that application of impedance based correctors results in the linear growth of change of distance between robots TCPs for constant difference between robots programmed speeds. Thus a modification of impedance based correctors is proposed. The modification consists in introduction of an integrating element in series with impedance corrector. Simulation tests for the modified correctors provide improved results – magnitude of change of distance is decreased. Linear increase of change of distance for impedance corrector is changed into a constant non zero value, whereas constant non zero value is changed into zero value. Simulation results for two dimensional case of coordinated motion are also presented.
Development of CyberFish – Polish Biomimetic Unmanned Underwater Vehicle BUUV
Authors: Morawski Marcin , Malec Marcin , Zajac Jerzy
Published: August 2014

Paper presents gradual progress in the development of biomimetic mobile underwater robot with undulating propulsion starting from the rugged but functional first version of CyberFish through very agile and manoeuvrable second and third version till fifth one – accurately imitating real fish. Trends in BUUV technology is briefly described in the introduction. The second and third sections describe previous, and actual state of CyberFish project successfully carried out at Cracow University of Technology and focusing on the succeeding robots design and construction. Paper is summarized with problems of the BUUV technology development yet to be solved.
Straight-Line Mechanisms as One Building Element of Small Precise Robotic Devices
Authors: Hricko Jaroslav
Published: August 2014

Small precise robotic devices, working on principle of compact compliant mechanisms, must meet the conditions to high positioning accuracy what mean moving in straight-line too. But, compliant mechanisms are usually produced by equivalent of revolute joints, therefore in design of small robotic devices is necessary apply knowledge from design of one type of specialized mechanisms – straight-line mechanisms. This paper presents some straight-line mechanism and its applications to design of some small precise robotic devices. According to kinematics analysis most known straight-line mechanisms are evaluated for their application in compliant mechanisms. Such devices are transformed to flexure structures. Consequently, these devices are important building blocks to design some linear-motion stages and/or micro-grippers.
A Real-Time and Effective Object Recognition and Localization Method
Authors: Ding Xiao Ling , Zhao Qiang , Li Yi Bin , Ma Xin
Published: August 2014

In this paper, we realize object recognition and localization in a real time based on appearance features of object. For object recognition, we proposed to use global feauture (color) of images, and with an improved color image segmentation algorithm to realize threshold segmentation based on pixels in the image’s HSV color model by using the tool OpenCV, so we can realize the special color object recognition. Further the object can be localized with the ground constrained method by using the camera perspective geometry model. In the lab conditions, we realized single color object recognition and localization by transplanting the algorithm into Amigobots mobile robot and proved this method is simple, effective and real-time.
Design and Research of a Sliding Mode Observer Based on Line Back-EMF for Brushless DC Motors
Authors: Ju Lai Cai , Wang Zi Qiang , He Meng Yu
Published: August 2014

This paper designs and implements a sliding mode observer with line-to-line trapezoidal back-EMF for brushless DC (BLDC) motor. Through the detection of three phase voltage and the current, the phase to-phase back-EMF is observed, and then the position signal and the rotor speed are estimated. The corresponding relationship between back-EMF and six rotor positions of the motor is established in this paper. With saturation function instead of sign function, the line current difference is used as the sliding surface. The whole control system employs an inner current PI loop with an outer speed PI loop. Simulation results show that the designed observer can correctly estimate the position information and speed, with strong robustness to changes of system parameters and external disturbances.
Application of Multi-Sensor Data Fusion Method in the Ammonia Modification System
Authors: Zhu He Lei , Meng Zhuo , Sun Yi Ze , Lu Wei , Zhu Zi Na
Published: August 2014

This paper provides a method of multi-sensor data detection and fusion, aims to resolve the data measurement inaccurate problem in the process variable control system of the ammonia modification equipment. First, it establishes the sensor data measurement model and calculates mutual support level of the multiple sensors, using boundary value judgment method to produce the multiple-sensor mutual support level matrix, the total number of mutual support level for one sensor in the matrix is the weight value of this sensor, and finally the normalized weighted average data fusion (NWADF) method is used for data process.Experimental results show that the proposed method for multi-sensor data fusion can effectively be used to identify the abnormal data in multi-sensor measurement system and improve the accuracy and stability of the process variable data measurement.
Real-Time Time Synchronization Detection System Application and Analysis
Authors: Qu Gang , Bi Xiao Liang , Ge Zhao Qiang , Zhang Pei Hong , Yuan Hao
Published: August 2014

In the power grid, the time-unity of power plant and substation equipments is one of the essential conditions to the operation of power grid. Power plant and substations use GPS or compass system to synchronize the time. The performance and function of GPS of different manufactures are not the same. If GPS can cope with interference and accurate timing analysis of antenna faults, the management departments would pay more attention to its operation condition and operation analysis. This paper introduced the construction situation of the Power Grid time synchronization monitoring system, and analyzed and summarized the operation conditions.
Trajectory Control of Museum Commentary Robot Based on Machine Vision
Authors: Xia Wen Tao , Wang Yan Ying , Huang Zhi Gang , Guan Hao , Li Ping Cai
Published: August 2014

The design aim to make the museum robot move according to desired trajectory. Having a commentary robot in museum can not only arouse visitor’s curiosity, but also save human resource. Furthermore, this robot can change and upgrade its software system according to museum action situation to accomplish different trajectory in different space. The machine vision tracked method is applied to museum robot, which mainly use camera to seek the marked object in proper order and accomplish designed trajectory movement.
A Research on the Trajectory Optimization Method of Automatic Feeding Ship
Authors: Zheng Zhi Ying , Zhao De An , Sun Yue Ping , Hong Jian Qing , Liu Hui Gui
Published: August 2014

This paper introduces an automatic feeding ship that applied in breeding crabs. For realizing autonomous navigation and making feed uniform on the surface of the aquaculture ponds, the GPS and automatic feeding machine are used on the ship. Bait scatters movement was analyzed by the method of physics and geometry which based on the structure and parameters of automatic feeding machine. For getting the mathematical model of bait distribution, the least square method is adopted to fit the experimental data. On this basis, the minimum variance of the bait thickness was selected as the objective function. An optimal trajectory was generated by using golden section method.
Anti-Collision Technique of SAW Tags Using Walsh Code
Authors: Kang Shuai , Li Jue Long , Xing Jian Chun , Xie Li Qiang , Wang Xiao Bo
Published: August 2014

—In view of the inefficiency of coding, the complexity of signal extraction and the strict demands of machining in the existing multiple SAW tags system, an anti-collision technique based on Walsh Code was proposed. First, it encodes the 2PSK using the single antenna transmission structure, then it implements the orthogonal encoding of each tag in a multiple SAW tags system using Walsh coding, and finally the encoding information of each tag is acquired by reading the echo signals from the reader and doing cross-correlation operation with each code block in the orthogonal code-set. The proposed approach incorporates both the coding efficiency and the processing technology, simplifies the complexity of signal extraction, and achieves the goal of anti-collision of multiple SAW tags system. The theoretical analysis and simulation verify the feasibility of this technique.
Majorized Algorithm and Best Efficiency Unbiased Estimation of Life Functions Parameter in Reliable Analysis of Existence and Life
Authors: Xiao Xiao Nan
Published: August 2014

This article, on the basis of several kinds of essential random truncated distribution functions in reliable analysis of existence and life, discusses the best efficiency unbiased estimation of the life distribution function parameter. It suppliijes reliable basis and efficient algorithm for solving the relative problem on reliable analysis of existence and on the best unbiased estimation in prediction of communication engineering and electrical load. The article is of extensive value in theory and in practice.
Speaker Identification Using a Novel Combination of Sparse Representation and Gaussian Mixture Models
Authors: Ma Yun Jie
Published: August 2014

In recent years, sparse representation has become a very popular method for pattern recognition which could outperform the traditional methods. This paper presents a novel combination of sparse representation and traditional Gaussian mixture models. Each person’s dictionary or termed as subspace in this paper are learned using K-SVD algorithm while the entries are GMM mean matrixes union for each speaker. Then project the test utterance into each dictionary and finally make decision depending on the reconstruction errors. The experiments are conducted on the database collected in our anechoic chamber. The proposed approach results in different accuracy for different sparsity and dictionary size. In appropriate parameters, the accuracy can reach 98.5% which is fairly good.
A Hydrodynamic Analysis of Offshore Platform Based on the AQWA
Authors: Wang Shi Ming , Shi Bing Feng , Lin Zi Nan , Zou Wei
Published: August 2014

With the drying up of land resources, the oil and natural gas,power generation equipment, and ocean data is in so great request that the research of the offshore platform is increasingly important.Offshore platform structure and the design of the mooring system both are influenced by the hydrodynamic performance.Then the floating type marine equipment carrier of hydrodynamic being analyzed after doing the frequency domain calculation for the model of floating body by the hydrodynamic software AQWA here.
A Two-Stage Double-Acting Hydraulic Pump Based on Crank Rod in Series with Symmetrical Hinge
Authors: Zhang Nan , Sun Cheng Feng , Cheng Xiang Dong , Zhang Wen Wen
Published: August 2014

A new composite drive supercharger based on crank rod in series with symmetrical hinge is introduced. This device utilizes the principle of hinge rod’s force amplification and combines with a two-stage double-acting hydraulic system, it achieves a good booster effect as a result. The two opposed piston-cylinders are excellent for the supplying of the system’s sustainable pressure, it is applied to high power output and green manufacturing. This article carries out a detailed analysis on the operating principle of the system, and the output flow and pressure’s formulas of the low-pressure high flow and high-pressure low flow were given.
A Simple Improvement of Fuzzy Control on Converter Technique of Fan
Authors: Zhang Ji Yang
Published: August 2014

Recently,more and more experts are forcing on the problem of how to save the energy efficiently during controlling the air volume of fan.Thus,this paper advises to control the air volume by using converter technique,and control the fan by using fuzzy control.Meanwhile,this paper shows a simple improvement of fuzzy control to save the problem of programming,and shows the thinking of the way to readers for reference.
Multiple Control System Design for Superconducting Power Supply Based on RST Algorithm
Authors: Song Min Hui , Long Jiao Jiao , Liu Xiao Ning
Published: August 2014

The power supply for the superconducting outsert of Steady High Magnetic Field Facility (SHMFF) in High Magnetic Field Laboratory of Chinese Academy of Sciences requires very high precision and high stability (10 ppm of 13kA). In this paper, a multiple controller has been developed which is in combination with analogue control in the voltage-loop and digital control (RST algorithm) in the current-loop. The system model and the detailed design and evaluation of the method are all presented. And the simulation and experimental results finally manifests that the output current can follow the reference perfectly (no lagging error, no overshoot), and its precision (<10ppm) and the output voltage fluctuation (<1%) both meet the requirements. Therefore, the proposed control system for the superconducting power supply is proved to be feasible.
Sliding Mode Control Based on Novel Nonlinear Sliding Surface for a Class of Time-Varying Delay Systems
Authors: Ren Qi Feng , Gao Cun Che , Bi Shu Hui
Published: August 2014

The sliding mode control (SMC) design is discussed for a class of time-varying delay systems which is delay-range-dependent and rate-range-dependent. A novel time-varying nonlinear sliding surface is employed. The choice of nonlinear sliding surface is to change the state matrix of sliding mode system, which can combine the advantages of different conventional linear sliding surfaces. Thus the better transient qualities of system states, i.e., quicker response and smaller overshoot, can be achieved. The sufficient conditions ensuring the asymptotic stability of sliding mode are derived in terms of linear matrix inequalities. The algorithms deciding unknown parameters of the nonlinear sliding surface and the corresponding sliding mode controller are also presented. Finally, A numerical example is given to illustrate the effectiveness of the result here.
Design of BP Neural Network Controller for Infrared Seeker Servo System Based on Stribeck Friction Model
Authors: Yan Xin Ying , Mo Bo , He Ying
Published: August 2014

The high precision of the seeker is the key to reduce the Miss-Distance and improve precision in the guidance system of missile, and the seeker stabilized platform servo system is safeguard of the overall performance of seeker. So based on the Stribeck friction model, this paper studies and compares the precision of position and velocity that controlled by PID control and BP neural network when the seeker platform working at low speed. Finally, according to the MATLAB simulation results, applying modern control theory as controller based on Stribeck friction model can improve precision and the problem of flat and dead zone at low speed.
Vehicle Noise Main Control Technology and the Important Parts
Authors: Xie Lu Sheng , Chen Xiao Yu , Lin Chun , Hu Tian Lin , Wang Lei
Published: August 2014

The rules of the China vehicle noise control are summarized. By analyzing the sources of vehicle noise, the important parts of vehicle noise are introduced. The main control technology and measures of reducing the noise of vehicles are presented. Because of the complexity of the vehicle noise control, at present there are a lot of technology and applications are blank in the research area.Reduce vehicle noise is an important subject of future automotive technology.
Research on Pressure Control Method of some Wind Tunnel Spraying Water Supply System
Authors: Xu Yin Li , Li Shu Cheng , Liu Nian , Chen Dan
Published: August 2014

By analyzing pressure control process of some wind tunnel spraying water supply system, a simplified method is presented, which can avoid interference between different pressure control circuits. Regulating valve is the key control equipment, and its regulating formula is given after detailed calculations and analysis. The simulation of pressure control for spraying water supply system is researched based on AMESim, which provides the theoretical support for experiment. In the end,experimental results show that the control method is effective, and water pressure precision can meet the technical requirements.
The Research on the Impulse Characteristics of the Extended Grounding Electrode in the Layered Soil
Authors: Zheng Jun Jie , Cao Bin , Liu Ming , Xia Chang Zheng , Tu Chang Geng , Zou Jian Ming , Zhou Wen Jun
Published: August 2014

The composition of the tower's grounding system is always with several layers, for single-layer structure of the tower in high soil resistivity area, it is the use of partial replacement of soil to reduce the tower grounding resistance, also the analysis object is equivalent to the hierarchical model, Therefore, the study of layered soil structure tower grounding impulse characteristics is more representative. To study the impact properties of the layered structure of the soil grounding, In this paper, through the establishment a double-layer soil model structure, the impulse characteristics of the soil structure of grounding electrode is studied through simulation, resulting of the quantitative relationship between several high resistivity soils partially replacing low resistivity soil area size and impulse grounding resistance of elongation grounding. The results show that the impulse grounding resistance decreases as the replacement area of low resistivity soil increases and converges to a certain value, which indicates the impulse characteristics of extended grounding electrode in double-layer soil model increases with the expand of the upper level low resistivity zone and approaching that of single layer with low resistivity soil. The results have a reference value for use of local soil replacement method to reduce tower impulse grounding resistance in high soil resistivity areas and the determination of soil replacement plan.
Forewarning of Cascading Failure Based on Comprehensive Entropy of Power Flow
Authors: Zhu Dan Dan , Liu Wen Ying , Lv Quan Cheng , Wang Wei Zhou , Wang Ning Bo
Published: August 2014

The comprehensive entropy of power flow is proposed in this paper based on the current entropy of power flow. The comprehensive entropy can not only describe the heterogeneity of the power flow distribution, but also takes the considerable effect of the high load rate lines on the cascading failure into consideration. Thus it can reflect the operation state in a more comprehensive way compared with the current entropy of power flow. A forewarning model which employs the comprehensive entropy as a forewarning index is also presented. And the case analysis verifies that the proposed forewarning model can assess the risk of cascading failures under the current operation state. It can identify the operation state the cascading failure risk of which accesses the set threshold, thus to help the operators of the power system to protect the power system from cascading failures.
The Influence of Aggregates on the Properties of Concrete
Authors: Šiler Pavel , Bezděk Ondřej , Kolářová Iva , Bartoníčková Eva , Opravil Tomáš , Šoukal František
Published: August 2014

This work is focused on the influence of aggregates on the mechanical properties of concrete and hydration process. The flexural strength and compressive strength were observed after 1, 7 and 28 days of curing. The process of hydration was monitored using isoperibolic calorimetry. Laser particle size analysis of aggregates was also performed. The following materials were used: Portland cement CEM I 42,5 R-Sc, finely ground silica sand, calcinated bauxite, fine, medium and rough testing sand (defined in ČSN EN 196-1).
Estimation of Impact-Echo Method for the Assessment of Long-Term Frost Resistance of Ceramic Tiles
Authors: Matysík Michal , Plšková Iveta , Chobola Zdeněk
Published: August 2014

The aim of this paper is to evaluate the possibility of using the Impact-echo method for assessment of extremely long period of frost resistance of ceramic tiles. Sets of ceramic tiles of the Ia class to EN 14 411 B standard made by manufacture RACOs have been analyzed. The ceramic tiles under investigation have been subjected to 500 freeze-thaw-cycle based degradation in compliance with the relevant EN ISO 10545-12 standard. To verify the correctness of the Impact-echo method results, additional physical properties of the ceramic tiles under test have been measured. To analyze the specimen surface condition, we also used Olympus LEXT 3100 confocal scanning microscope. It has been proved that the acoustic method Impact-echo is a sensitive indicator of the structure condition and can be applied to the ceramic cladding element frost resistance and service life prediction assessment.
Surface Layer Parameter of Concrete in Relation to Deicing Salt Scaling Resistance
Authors: Urban Jaroslav , Kostelecká Michaela , Klecka Tomas
Published: August 2014

The porous structure together with surface layer, made by the compaction of concrete mix designed and by the following treatment of concrete placed, has a decisive influence on the penetration of aggressive media into the inside of concrete structure. In principle, it influences the parameters of hardened concrete and the transport of liquid and gaseous media. The surface layer of concrete is contacted as the first with aggressive substances and is an entrance gate for unwanted ones.
The Influence of Zinc on the Hydration and Compressive Strength of Portland Cement
Authors: Kolářová Iva , Šiler Pavel , Šoukal František
Published: August 2014

The aim of this work was to investigate the effect of addition of elements present in secondary raw materials on the hydration and compressive strength of Portland cement. Ordinary Portland cement (OPC) has been used to solidify hazardous waste for about 25 years and the effect of waste components on the hydraulic activity is an interesting object for the research. In this study Zn nitrate, chloride and oxide were added to Portland cement. The concentrations of 0.1 and 1.0 weight percent of zinc in cement were tested. After 1, 7 and 28 days the compressive strength was reduced or similar by the addition of zinc in comparison with pure cement. This difference is probably due to a delay in tricalcium silicate hydration as shown by isothermal calorimetry.
Timber - Concrete Structural Element with Glued Steel Mesh
Authors: Daňková Jana
Published: August 2014

Future of the building technologies are now confronted with the concept of sustainable development. Environmental criteria are becoming a standard part of the process of design and analysis of building structures. Research and development of environmentally acceptable structures is one of the priorities. Timber-concrete structures are perspective in terms of environmental criteria. This paper discusses the results gained from experimental verification of stiffness parameters for new type of composite structural member. The connections of wood and concrete composite part cross-section are provided with perforated steel bar. The slip coefficient was determined for this type of connection.
Use of Wood Biomass in Slovakia
Authors: Bakalár Tomáš , Pavolová Henrieta , Búgel Milan , Kozáková Ľubica
Published: August 2014

Biomass is organic material, the second most important source of energy. Biomass is a renewable energy source. Wood biomass is used as source of energy for heating in many regions in Slovakia. It is because of its availability. Wood biomass is an easily accessible and affordable source of energy. At present, thermochemical processes, biochemical processes and physical-chemical processes are used for biomass utilization. In the article a suitable technology for combustion of wood chips is proposed. It consists of five main technological parts: transport of wood chips, silo, combustion boiler, and stack.
Using Wood Waste in Slovakia and its Real Energy Potential
Authors: Cehlár Michal , Jurkasová Zuzana , Kudelas Dušan , Tutko Róbert , Mendel Ján
Published: August 2014

Energy production from previously unused wood waste, which is produced by mining and manipulation in forestry, wood processing plants and in plants and also more efficient energy recovery firewood in the total amount of about 500 000 t, can annually replace the same amount of brown sorted coal. This has a significant national- economic importance in saving precious fuel but the financial effect greatly exceeding the environmental- ecological benefits resulting from the reduction of environmental burdens, exhausts and incombustible solid residues. These are only a few advantages and also the reasons why it is necessary especially at present days to deal with biomass and wood waste as well. The article therefore outlines a comparison of the previous use of this energy source as well as its possible future development.
Exploring the Impact on Radio Frequency Signal of RFID Technology Related to Physical Protection of Renewable Resources
Authors: Ščurek Radomir , Konečný Martin , Stoniš Ondřej , Maršálek Daniel
Published: August 2014

Radio Frequency Identification (referred to as RFID) is an effective and contactless feature of identification and localization of the object of interest with specific system structure that includes defining the principle of operation of the primary components, which are the transponder and the reader. The range of applicability of RFID system is diverse, but its optimum usability is given primarily by the choice of appropriate frequency which will ensure the functionality of the whole system in terms of physical protection. The article therefore deals with the operation of RFID technology in various wavelengths of frequency band and influence of radio frequency signal with a focus on the action radius of physical protection of renewable resources (e.g. research centers, universities, power plant using energy from renewable resources) as a technical means destined for increasing the level of security and protection of persons, property or other assets.
Research of Possibilities of Using the Recycled Materials Based on Rubber and Textiles Combined with Vermiculite Material in the Area of ​​Noise Reduction
Authors: Liptai Pavol , Moravec Marek , Badida Miroslav
Published: August 2014

This paper describes possibilities in the use of recycled rubber granules and textile materials combined with vermiculite panel. The aim of the research is the application of materials that will be absorbing or reflecting sound energy. This objective is based on fundamental physical principles of materials research and acoustics. Method of measurement of sound absorption coefficient is based on the principle of standing wave in the impedance tube. With a sound level meter is measured maximum and minimum sound pressure level of standing wave. From the maximum and minimum sound pressure level of standing wave is calculated sound absorption coefficient αn, which can take values from 0 to 1. Determination of the sound absorption coefficient has been set in 1/3 octave band and in the frequency range from 50 Hz to 2000 Hz. In conclusion are proposed possibilities of application of these materials in terms of their mechanical and physical parameters.
Study of the Mechanical Properties Re-Processed of Thermoplastic Polymer Composites
Authors: Dulebová Ľudmila , Duleba Branislav , Krzyżak Aneta
Published: August 2014

This study presents the evaluation of selected mechanical tests of polymer composites which were re-processed. Materials Valox PBT (with 30 % glass fibre) and Celanex® 2004-2 PBT (without filler) and their regranulate were used at tests. The material PBT - regranulate PBT compositions investigated were 100/0, 80/20, 60/40, 30/70 and 0/100. Samples from PBT were prepared by injection molding and their mechanical properties were tested by tensile test and Shore hardness test. The material made from 100% recycled material compared to the baseline had a decrease in tensile strength and Shore hardness value hasn’t changed. Failure of the samples was also observed by SEM. Utilization of regranulate at the production of new moulded parts are important from aspect of reduction plastics waste and pollution abatement of environment.
Assessment of Wood Materials Modified by Flame Retardants at Loading by Heat Flux
Authors: Harangozó Jozef , Balog Karol , Szabova Zuzana , Kuracina Richard , Cekan Pavol
Published: August 2014

The article deals with assessing the impact of the heat flux on the flammability of wood materials with application of fire retardants potassium hydrogen carbonate (KHCO3) and azanium dihydrogen phosphate (NH4H2PO4), which can limit or slow down the combustion of the material. After application of fire retardants on samples time to ignition increased and thus confirmed the retardation effect. Retarding effect was observed depending upon the concentration of the solution applied to the sample.