Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225622
J. Hrubý, O. Tureček
This paper is concerned with measurement of knock sensors. Knock sensor is a piezoelecectric sensor and it is used as a component of the car engine. It produces an output voltage in proportion to the vibrations. In this paper, there are shown measurements of the voltage sensitivity and the frequency response, which are necessary for using the knock sensor.
{"title":"Measurement of knock sensors","authors":"J. Hrubý, O. Tureček","doi":"10.1109/ELEKTRO.2012.6225622","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225622","url":null,"abstract":"This paper is concerned with measurement of knock sensors. Knock sensor is a piezoelecectric sensor and it is used as a component of the car engine. It produces an output voltage in proportion to the vibrations. In this paper, there are shown measurements of the voltage sensitivity and the frequency response, which are necessary for using the knock sensor.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126368344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225616
J. Mikulski
Design and development of telematics transport systems represents a new approach to solving transportation problems. Telematics offers large opportunities to strengthen the positive features of transport (availability, mobility), while minimizing its negative impacts (e.g. environmental pollution, energy consumption, congestion, accidents, infrastructure construction costs) without any additional spending on investment. The up-to-date telematics systems provide the transport users a revolutionary opportunity to effectively utilize its services.
{"title":"Introduction of telematics for transport","authors":"J. Mikulski","doi":"10.1109/ELEKTRO.2012.6225616","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225616","url":null,"abstract":"Design and development of telematics transport systems represents a new approach to solving transportation problems. Telematics offers large opportunities to strengthen the positive features of transport (availability, mobility), while minimizing its negative impacts (e.g. environmental pollution, energy consumption, congestion, accidents, infrastructure construction costs) without any additional spending on investment. The up-to-date telematics systems provide the transport users a revolutionary opportunity to effectively utilize its services.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126482104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225668
M. Stork
In this paper, a one new approach for synthesizing nonlinear circuits is presented. The system consists of nonlinear electronic circuits and linear electric part for simulating and constructing of nonlinear dynamics. One advantage of our approach is that it can be directly synthesize by means of nonlinear circuits from ordinary differential equations. Presented circuit is able to generate the robust chaotic attractors. This system can be used e.g. for secure communication, modulation etc. The designed systems were simulated and also constructed in digital version using microcontroller. Application of this equations in financial system is also presented.
{"title":"Synthesis of nonlinear electronic system simulation and construction","authors":"M. Stork","doi":"10.1109/ELEKTRO.2012.6225668","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225668","url":null,"abstract":"In this paper, a one new approach for synthesizing nonlinear circuits is presented. The system consists of nonlinear electronic circuits and linear electric part for simulating and constructing of nonlinear dynamics. One advantage of our approach is that it can be directly synthesize by means of nonlinear circuits from ordinary differential equations. Presented circuit is able to generate the robust chaotic attractors. This system can be used e.g. for secure communication, modulation etc. The designed systems were simulated and also constructed in digital version using microcontroller. Application of this equations in financial system is also presented.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"41 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120883847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225641
P. Minarech, J. Vittek, V. Vavrúš, P. Makys
The paper describes development of a new energy saving control algorithms for precise position control for AC drives. Designed control algorithms limit energy consumption for defined rotor position maneuver, increase efficiency of the drive and contribute to the substantial improvements of environment. Overall position control system consists of three parts. As the first part, the `minimum energy generator' computes a special acceleration, velocity and position profile, where the magnitude and time of acceleration or deceleration are determined such a way that comply with position demand and prescribed time for position maneuver. The role of `feed-forward precompensator', as a second part, is to achieve precise tracking of the prescribed reference position with zero dynamic lag. Third part is position controller, which can be based on field oriented control, forced dynamics control or sliding mode control. Developed `energy saving control algorithms' are easy to implement digitally and can be exploited for position control of existing a.c. drives.
{"title":"Experimental verification of new energy saving position control algorithm for AC drives","authors":"P. Minarech, J. Vittek, V. Vavrúš, P. Makys","doi":"10.1109/ELEKTRO.2012.6225641","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225641","url":null,"abstract":"The paper describes development of a new energy saving control algorithms for precise position control for AC drives. Designed control algorithms limit energy consumption for defined rotor position maneuver, increase efficiency of the drive and contribute to the substantial improvements of environment. Overall position control system consists of three parts. As the first part, the `minimum energy generator' computes a special acceleration, velocity and position profile, where the magnitude and time of acceleration or deceleration are determined such a way that comply with position demand and prescribed time for position maneuver. The role of `feed-forward precompensator', as a second part, is to achieve precise tracking of the prescribed reference position with zero dynamic lag. Third part is position controller, which can be based on field oriented control, forced dynamics control or sliding mode control. Developed `energy saving control algorithms' are easy to implement digitally and can be exploited for position control of existing a.c. drives.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122739202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225642
E. Pădurariu, L. Someşan, I. Viorel, L. Szabó
The permanent magnet transverse flux machine (PMTFM) is characterized by power densities figures larger than the conventional electric motors and by a specific modularity. The PMTFM has usually a complicated structure with a true three dimensional (3D) pattern. In this paper, a PMTFM with a simple structure is proposed for a ship drive system and its performance are checked via a three dimensions finite element method (3D-FEM) analysis. The PMTFM's dynamic behavior is studied too. The obtained results are finally commented.
{"title":"Large power permanent magnet transverse flux motor, steady-state and dynamic behavior","authors":"E. Pădurariu, L. Someşan, I. Viorel, L. Szabó","doi":"10.1109/ELEKTRO.2012.6225642","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225642","url":null,"abstract":"The permanent magnet transverse flux machine (PMTFM) is characterized by power densities figures larger than the conventional electric motors and by a specific modularity. The PMTFM has usually a complicated structure with a true three dimensional (3D) pattern. In this paper, a PMTFM with a simple structure is proposed for a ship drive system and its performance are checked via a three dimensions finite element method (3D-FEM) analysis. The PMTFM's dynamic behavior is studied too. The obtained results are finally commented.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132916186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225646
P. Sekerák, V. Hrabovcová, M. Onufer, L. Kaiamen, P. Rafajdus
This paper deals with synchronous machines with different permanent magnet (PM) materials. Three PMSM are presented in this paper. At first, the PMSM with NdFeB PM, which is really constructed. Second, the NdFeB has been replaced by ferrites PM. Third, the new design of synchronous motor with ferrites is presented. The volume of PM and the whole size is increased to keep the same power output as that of the initial motor. Parameters, EMF, V-curves, efficiency and thermal behavior of all three machines are investigated and compared.
{"title":"Synchronous motors with different PM materials","authors":"P. Sekerák, V. Hrabovcová, M. Onufer, L. Kaiamen, P. Rafajdus","doi":"10.1109/ELEKTRO.2012.6225646","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225646","url":null,"abstract":"This paper deals with synchronous machines with different permanent magnet (PM) materials. Three PMSM are presented in this paper. At first, the PMSM with NdFeB PM, which is really constructed. Second, the NdFeB has been replaced by ferrites PM. Third, the new design of synchronous motor with ferrites is presented. The volume of PM and the whole size is increased to keep the same power output as that of the initial motor. Parameters, EMF, V-curves, efficiency and thermal behavior of all three machines are investigated and compared.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115100405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225657
J. Jurcik
Paper is about mathematical interpretation of transformer insulation system. Base of this system is composed by two elements oil and paper. We need to simulate this system for more precisely results from measurement. Section three describes how to calculate relaxation currents and how that currents are generated. So we are able to compare measured and computed values and deduce actual condition of this insulation system.
{"title":"Analysis of insulating state on transformer model using PDC method","authors":"J. Jurcik","doi":"10.1109/ELEKTRO.2012.6225657","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225657","url":null,"abstract":"Paper is about mathematical interpretation of transformer insulation system. Base of this system is composed by two elements oil and paper. We need to simulate this system for more precisely results from measurement. Section three describes how to calculate relaxation currents and how that currents are generated. So we are able to compare measured and computed values and deduce actual condition of this insulation system.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123709421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225664
A. Předota, Z. Benešová, L. Koudela
This paper deals with surge phenomena in the transformer winding which are caused by switching-on processes or by the lightning stroke into the overhead line. In both cases the surge voltage or the current wave propagating via the transmission line into the transformer winding are considered and influence of the transmission lines on a travelling surge wave is studied. The model of the whole system is based on the circuits with distributed parameters and is described with the system of partial differential equations. The mathematical model is solved numerically by FDTD method it results in the time-space distribution of the voltage and the current. It enables to determine the most dangerous points at the winding and to improve a design of the isolation system and system of protections. Some illustrative examples are solved and interesting results are presented.
{"title":"Surge phenomena in system of transmission line and transformer winding","authors":"A. Předota, Z. Benešová, L. Koudela","doi":"10.1109/ELEKTRO.2012.6225664","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225664","url":null,"abstract":"This paper deals with surge phenomena in the transformer winding which are caused by switching-on processes or by the lightning stroke into the overhead line. In both cases the surge voltage or the current wave propagating via the transmission line into the transformer winding are considered and influence of the transmission lines on a travelling surge wave is studied. The model of the whole system is based on the circuits with distributed parameters and is described with the system of partial differential equations. The mathematical model is solved numerically by FDTD method it results in the time-space distribution of the voltage and the current. It enables to determine the most dangerous points at the winding and to improve a design of the isolation system and system of protections. Some illustrative examples are solved and interesting results are presented.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121425251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225647
B. Skala, J. Fořt
The pantographs producer needs to perform the lifetime test of the pantographs. This test usually takes 2 months when the test is running continuously 24 hours per day. We must design and build mechanical frame and control unit as well. It was our first experience with the lifetime test of this type. In addition, all preparation must be done during 2 weeks. The fast starting of the endurance test - it was our benefit before the rival company.
{"title":"Endurance test of the pantographs for main line vehicles","authors":"B. Skala, J. Fořt","doi":"10.1109/ELEKTRO.2012.6225647","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225647","url":null,"abstract":"The pantographs producer needs to perform the lifetime test of the pantographs. This test usually takes 2 months when the test is running continuously 24 hours per day. We must design and build mechanical frame and control unit as well. It was our first experience with the lifetime test of this type. In addition, all preparation must be done during 2 weeks. The fast starting of the endurance test - it was our benefit before the rival company.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125047395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-21DOI: 10.1109/ELEKTRO.2012.6225578
V. Sedlák, D. Durackova, R. Záluský
Speech signals extraction is becoming more and more important in variety applications such as mobile phones, conference equipments, radars and others. This paper presents a blind method to enhance and separate speech signals in noisy environment. The proposed technique exploits the independent component analysis (ICA) to separate speech signals. We investigate impact of environment (noise, number of sources and their location, etc.) for performance of this method. For evaluation of performance are used parameters source-to-interference ratio SIR, source-to-distortion ration SDR and source-to-artifacts ration SAR.
{"title":"Investigation impact of environment for performance of ICA for speech separation","authors":"V. Sedlák, D. Durackova, R. Záluský","doi":"10.1109/ELEKTRO.2012.6225578","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225578","url":null,"abstract":"Speech signals extraction is becoming more and more important in variety applications such as mobile phones, conference equipments, radars and others. This paper presents a blind method to enhance and separate speech signals in noisy environment. The proposed technique exploits the independent component analysis (ICA) to separate speech signals. We investigate impact of environment (noise, number of sources and their location, etc.) for performance of this method. For evaluation of performance are used parameters source-to-interference ratio SIR, source-to-distortion ration SDR and source-to-artifacts ration SAR.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116351355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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