The development of a chopstick-like two-fingered micromanipulator based on a hybrid mechanism is presented. The microhand consists of two 3-prismatic-revolute-spherical (PRS) parallel modules connected serially in a m...
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The paper describes a new MLF (Mostly Loaded First) method of HTTP requests scheduling and distribution in a cluster-based Web system. Its application enables keeping the quality of the Web service on the required lev...
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The paper describes a new MLF (Mostly Loaded First) method of HTTP requests scheduling and distribution in a cluster-based Web system. Its application enables keeping the quality of the Web service on the required level and makes the Web service behave in a predictable way, opposite to other Web services offering unpredictable and unreliable services of best-effort type. MLF method helps to keep the page response time within established bounds, so that at a heavy workload, servicing both small and simple or more complex pages, would not exceed the imposed time limit. In the method presented, appropriate mechanisms of HTTP requests scheduling have been applied, as well as a new algorithm of the requests distribution has been proposed. In the paper, the method, the testbed and results obtained, which indicate desirability of further research on the MLF method, are presented.
The paper presents the idea of using and application of On-Line Analytical Processing (OLAP) systems in monitoring of electrical power engineering devices. Data saved in central repository for historical data are subm...
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ISBN:
(纸本)9781424438976
The paper presents the idea of using and application of On-Line Analytical Processing (OLAP) systems in monitoring of electrical power engineering devices. Data saved in central repository for historical data are submitted through online working analytic systems. At the moment of addition of new data happens process of definition the mutual correlation between the new and already existing data. This leads to the analysis based on OLAP systems. The hereby paper describes the advantages of OLAP systems in aspect of using them in monitoring of electrical power engineering devices.
The paper presents the range and possibilities of using expert systems at diagnostic measurements of insulation systems of power appliances taken by the acoustic emission (AE) method. Multi-parametric descriptors char...
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ISBN:
(纸本)9781424438976
The paper presents the range and possibilities of using expert systems at diagnostic measurements of insulation systems of power appliances taken by the acoustic emission (AE) method. Multi-parametric descriptors characterizing the AE signals, which can be used in the knowledge base as criteria making the identification of basic partial discharge forms (PDs) possible, have been characterized in detail. The paper shows descriptors describing the AE signals registered in time, frequency, time-frequency domains and statistical data.
The article presents the analysis of dynamic states of switched reluctance motors. The analysis was performed for double phase SRM. The Matlab/Simulink environment with PLECS toolbox was used for the calculations. Sim...
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ISBN:
(纸本)9781424438976
The article presents the analysis of dynamic states of switched reluctance motors. The analysis was performed for double phase SRM. The Matlab/Simulink environment with PLECS toolbox was used for the calculations. Simulated transient results of switched reluctance motor were presented in the article. The FEMM software was used for the integral parameters calculations.
This paper provides a review of most commonly used numerical methods for computational electromagnetics. It points main strengths and weakness of given methods.
ISBN:
(纸本)9781424438976
This paper provides a review of most commonly used numerical methods for computational electromagnetics. It points main strengths and weakness of given methods.
The paper presents the performance of the switched reluctance motor. The calculation of the magnetic field and electromagnetic torque were performed using the Femm program, based on the finite element method. The calc...
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ISBN:
(纸本)9781424438976
The paper presents the performance of the switched reluctance motor. The calculation of the magnetic field and electromagnetic torque were performed using the Femm program, based on the finite element method. The calculation results are in good agreement with experimented data obtained on the prototype motor. The presented calculations enables to determine the output electromechanical parameters of the motor already being in the stage of the design.
Steel making is known as a complex manufacturing industrial process. Automation of the process represents a challenge. Empirical mathematical modeling of the process was used to design mill equipment, ensure productiv...
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ISBN:
(纸本)9781615676668
Steel making is known as a complex manufacturing industrial process. Automation of the process represents a challenge. Empirical mathematical modeling of the process was used to design mill equipment, ensure productivity and service quality. This modeling approach shows many problems associated to complexity and time consumption. Soft computing techniques show significant modeling capabilities on handling complex nonlinear systems modeling. In this paper, we explore the use of Takagi-Sugeno (TS) technique to develop fuzzy models for the Hot-Rolling industrial nonlinear process. We propose three models for the rolling force, torque and slab temperature. A set of rules and membership functions which represents the dynamical relationship between the input and output of these models shall be presented. The performance of the fuzzy models will be compared to the known empirical models for the hot rolling system. Experimental data measured from the Ere˜gli Iron and Steel Factory in Turkey shall be used for the verification of the model outstanding performance.
In the paper measurements of streaming electrification current in the range of low velocities are presented. The measurements were conducted in spinning disk system that uses wireless rotating electrometer. Using this...
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In the paper measurements of streaming electrification current in the range of low velocities are presented. The measurements were conducted in spinning disk system that uses wireless rotating electrometer. Using this system it is possible to measure electrification current in the range of several picoamperes. In proposed configuration the electrometer is installed in measurement object on the disk axle. The digital output is transferred using Bluetooth radio-frequency transceiver. This solution minimizes external disturbances and allows for measurement with standard uncertainty at the level of 30 fA depending on averaging time. The uncertainty slightly depends on spinning velocity. Several dependencies of averaged electrification current on rotational speed were shown. A fresh and C 60 fullerene doped transformer oil were used as an electrification source. It was observed that the electrification current can change its sign for different C 60 concentrations. Doping mineral oil leads to charge reversal in the electric double layer. The system presented in paper extends the range of possible research in the field of electrification on low velocities and can be useful in development of streaming electrification phenomena.
A new methodology for the design of control systems for real time applications is presented. It is proposed to have a first stage of assisted design of nominal systems with simulation based verification of the achieve...
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A new methodology for the design of control systems for real time applications is presented. It is proposed to have a first stage of assisted design of nominal systems with simulation based verification of the achieved performances. The control algorithm will then be improved by robustification to reproduce as good as possible the performances obtained in simulation on the real time process. Finally, a supervisor is implemented to optimize the thermo-energetic process and to compute the best choice for the reference signals.
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