Wyniki wyszukiwania - BazTech

1

Spectrum Awareness in Cognitive Radio Systems

Suchański M., Kaniewski P., Kosmowski K., Kustra M., Romanik J.

International Journal of Electronics and Telecommunications

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2020

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Vol. 66, No. 4

665--670

EN

The paper addresses the issue of the Electromagnetic Environment Situational Awareness techniques. The main focus is put on sensing and the Radio Environment Map. These two dynamic techniques are described in detail. The Radio Environment Map is considered the essential part of the spectrum management system. It is described how the density and deployment of sensors affect the quality of maps and it is analyzed which methods are the most suitable for map construction. Additionally, the paper characterizes several sensing methods.

2

Utilisation of IoT and sensing for machine tools

Fujishima Makoto, Mori Masahiko, Narimatsu Koichiro, Irino Naruhiro

Journal of Machine Engineering

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2019

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Vol. 19, No. 1

38--47

EN

Strong requirements for automation in the production processes using machine tools have been increasing due to lack of high-skilled machining engineers. Automation used to be utilised in mass production, but it is also necessary in medium- to low-volume production recently. Next requirements will be monitoring or sensing functions to make the following possible: prompt service when the machine stops; detection of abnormality before the machine breaks down; and compensation of thermal displacement to ensure machining accuracy. These now need to be performed automatically in place of operators so that abnormality can be detected during machining operation. In this paper core technologies to support automation system will be discussed which are operation monitoring, predictive maintenance, sensing interface and thermal displacement compensation as a sensing application.

3

Detekcja hybrydowa jako metoda zwiększająca wydajność sensingu

Suchański M., Kustra M., Kosmowski K., Pawelec J.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2017

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nr 6

392--395, CD

PL

W referacie omówiono hybrydowy sensing widma oraz przedstawiono detektor hybrydowy (HD) zwiększający wydajność sensingu. Zaproponowany HD wykorzystuje zalety detekcji energii (ED) oraz metody CAV (ang. Covariance Absolut Value). Scharakteryzowano model systemu dla którego przeprowadzone zostały badania oraz zaprezentowano wyniki badań symulacyjnych dla sygnału OFDM (ang. Orthogonal Frequency Division Multiplexing).

EN

The paper discusses the hybrid sensing and presents hybrid detector (HD) which improves the sensing performance. The proposed HD takes advantage of the energy detection (ED) and CAV (Covariance Absolute Value) methods. In the paper was described the system model and was presented the simulation results for OFDM signal (Orthogonal Frequency Division Multiplexing).

4

Baza danych dla potrzeb mapy środowiska radiowego

Bednarek P., Łopatka J.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2017

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nr 8-9

1053--1057, CD

PL

Niniejszy artykuł przedstawia propozycję dwupoziomowej struktury bazy danych dla potrzeb mapy środowiska radiowego (ang. Radio Environment Map - REM), przeznaczonej dla mobilnych sieci radiowych. Artykuł przybliża istotę i cel stosowania bazy danych REM, opisuje strukturę danych zaimplementowanej bazy, a także graficzny interfejs użytkownika wykonany w środowisku Qt, służący do edycji REM i sterowania pracą programowanego modemu radiowego USRP (ang. Universal Software Radio Peripheral).

EN

This article presents the proposed data structure for a two-layered Radio Environment Map (REM) database for mobile radio networks. This article outlines the essence and purpose of using the REM database, describes the implemented database, data structure and graphical user interface developed in Qt environment, used for editing REM and control the USRP software defined radio.

5

Ranking criteria for assessment of municipal solid waste dumping sites

Mahmood K., Batool S. A., Chaudhary M. N., Ul-Haq Z.

Archives of Environmental Protection

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2017

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Vol. 43, no. 1

95--105

EN

Priority wise channelization of resources is the key to successful environmental management, especially when funds are limited. The study in hand has successfully developed an algorithmic criterion to compare hazardous effects of Municipal Solid Waste (MSW) dumping sites quantitatively. It is a Multi Criteria Analysis (MCA) that has made use of the scaling function to normalize the data values, Analytical Hierarchy Process (AHP) for assigning weights to input parameters showing their relevant importance, and Weighted Linear Combination (WLC) for aggregating the normalized scores. Input parameters have been divided into three classes namely Resident’s Concerns, Groundwater Vulnerability and Surface Facilities. Remote Sensing data and GIS analysis were used to prepare most of the input data. To elaborate the idea, four dumpsites have been chosen as case study, namely Old-FSD, New-FSD, Saggian and Mahmood Booti. The comparison has been made first at class levels and then class scores have been aggregated into environmental normalized index for environmental impact ranking. The hierarchy of goodness found for the selected sites is New-FSD > Old-FSD > Mahmood Booti > Saggian with comparative scores of goodness to environment as 36.67, 28.43, 21.26 and 13.63 respectively. Flexibility of proposed model to adjust any number of classes and parameters in one class will be very helpful for developing world where availability of data is the biggest hurdle in research based environmental sustainability planning. The model can be run even without purchasing satellite data and GIS software, with little inaccuracy, using imagery and measurement tools provided by Google Earth.

6

Laboratory testing of velocity sensing in a magnetorheological damper with power generation

Sapiński B.

Acta Mechanica et Automatica

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2017

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Vol. 11, no. 3

186--189

EN

The study summarises the results of experimental examination of velocity sensing capability in a prototype of a magnetorheological damper with power generation (MRD). The device has two main components: an electromagnetic power generator and an MR damper. The study outlines the structure of the device with the main focus on the generator part, and provides results of tests performed under the idle run. The discussion of demonstrates the potentials of MRD action as a velocity-sign sensor and presents key issues which need to be addressed to enable its real life applications.

7

Sensing underground coal gasification by ground penetrating radar

Kotyrba A., Stańczyk K.

Acta Geophysica

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2017

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Vol. 65, no. 6

1185--1196

EN

The paper describes the results of research on the applicability of the ground penetrating radar (GPR) method for remote sensing and monitoring of the underground coal gasification (UCG) processes. The gasification of coal in a bed entails various technological problems and poses risks to the environment. Therefore, in parallel with research on coal gasification technologies, it is necessary to develop techniques for remote sensing of the process environment. One such technique may be the radar method, which allows imaging of regions of mass loss (voids, fissures) in coal during and after carrying out a gasification process in the bed. The paper describes two research experiments. The first one was carried out on a large-scale model constructed on the surface. It simulated a coal seam in natural geological conditions. A second experiment was performed in a shallow coal deposit maintained in a disused mine and kept accessible for research purposes. Tests performed in the laboratory and in situ conditions showed that the method provides valuable data for assessing and monitoring gasification surfaces in the UCG processes. The advantage of the GPR method is its high resolution and the possibility of determining the spatial shape of various zones and forms created in the coal by the gasification process.

8

Optymalizacja oszczędności energetycznej kooperacyjnej detekcji sygnałów w ujęciu logiki rozmytej

Cichoń K., Kliks A., Bogucka H.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2016

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nr 6

385--388, CD

PL

W artykule przedstawiono analizę oszczędności energetycznej kooperacyjnej detekcji sygnałów. W tym celu sprecyzowano zestaw kryteriów oddziałujących na oszczędność energetyczną. W analizie zastosowano także narzędzia dostępne w logice rozmytej takie jak macierz zależności oraz wykres rozetowy. Zdefiniowano dwa praktyczne przypadki testowe i z wykorzystaniem omówionych narzędzi przeanalizowano ich oszczędność energetyczną.

EN

In the article the energy-efficiency analysis of the cooperative spectrum sensing is presented. To this end, the set of energy-efficiency based criteria have been created. Moreover, the fuzzy-logic based tools have been incorporated, such as dependency matrix and rose chart. Two practical use cases have been defined and used for further energy efficiency analysis.

9

Wyszukiwanie wolnych kanałów OFDM dla radia kognitywnego metodą autokorelacji cyklicznej

Pawelec J., Suchański M., Kosmowski K.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2015

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nr 10

1575--1578

PL

Podano podstawy teorii oraz proste przykłady symulacji detekcji sygnału OFDM pod względem wyszukiwania wolnych kanałów dla radia kognitywne¬go, np. w pasmach TV. Metoda wykorzystuje cykliczną funkcję autokorelacji (CAF), która zdradza obecność tzw. prefiksu, służącego do neutralizacji efektów wielodrożności.

EN

The theoretic background and the simple simulations have been done for sensing the OFDM Free Channels for Cognitive Radio. The method is based on the cyclic autocorrelation function (CAF). It detects the prefix of the OFDM signal, which is its inherent feature used for cancellation the multi-rays effects.

10

Relationship between wire feed speed and metal transfer in GMAW

Węglowski M. S., Huang Y., Zhang Y.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 29, nr 2

191-194

EN

Purpose: This paper presents the results of an investigation of the metal transfer. The main goal of the investigation was to check that using narrow band filter and high speed digital video camera can be used, without a back-lighting laser, to observe the metal transfer process. Presented are the influence of wire feed rate (welding current) on droplet diameter, droplet trajectory and velocity. Design/methodology/approach: The experiments were carried out on an automated welding table. A high speed video camera "Olympus i-SPEED" was used. For each welding wire feed speed the image of metal transfer and welding parameters (welding current, arc voltage and wire feed rate) were recorded. Findings: Results presented in this paper indicate that the wire feed has a sig.nificant influence on droplet diameter, droplet trajectory and droplet velocity. That method based on digital high speed camera and narrow band filter is very sensitive to the changes of welding conditions and should be used as a tool for monitoring of the GMAW process. Research limitations/implications: The high speed video camera is an expensive instrument and it can be used only as a laboratory tool in monitoring and optimizing of welding processes. Practical implications: The achieved experience allows directing further research on the metal transfer in GMAW and studying the possibilities of using this method in other welding processes. Originality/value: The new method for monitoring metal transfer based on narrow band filter and high speed digital camera does not require He-Ne laser to provide the back-lighting in order to observe the metal transfer process. This method is cheaper and easier to use. The original results of these investigations are mathematic descriptions of droplet flight trajectory and droplet velocity.

11

Effect of welding current on metal transfer in GMAW

Węglowski N., Huang Y., Zhang Y.

Archives of Materials Science and Engineering

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2008

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Vol. 33, nr 1

49-56

EN

Purpose: The paper presents findings related to the influence of welding current on metal transfer in GMAW. The main goal was to understand how droplet diameter, droplet velocity and droplet transfer rate change with the wire feed speed which determines the welding current. Design/methodology/approach: The experimental station was designed and built. A high speed video camera "Olympus i-SPEED" was used. The investigations were conducted on an automated GMAW platform. For each wire feed speed the images of metal transfer and welding parameters were recorded. Findings: Research results presented in this paper indicate that the wire feed speed (welding current) has a significant influence on droplet diameter, droplet velocity and transfer rate. The new method based on narrow band filter for imaging is much more sensitive to the changes of welding conditions and should be used as a tool for monitoring of GMAW process. Research limitations/implications: The high speed video camera is an expensive instrument and it can be used only as a laboratory tool in monitoring and optimizing of welding processes. Practical implications: The gained experience will help to determine the further directions for the research on metal transfer in GMAW and help the authors to be prepared for studying the CMT welding process. This methodology will be particularly attractive for welded - structures manufacturing industry because it could significantly reduce the cost of production by optimizing welding parameters. Originality/value: The new method for monitoring metal transfer based on narrow band filter does not require He-Ne laser to be placed ob the opposite of the imaging plane to generate a shadow. This method is thus more compact and easier to use. The original results of these investigations are mathematic descriptions of droplet flight trajectory and droplet velocity.

12

Monitorowanie spawania metodą TIG z wykorzystaniem promieniowania łuku spawalniczego

Węglowski M. S.

Archiwum Technologii Maszyn i Automatyzacji

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2007

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Vol. 27, nr 1

103-112

PL

W artykule przedstawiono wyniki rozkładu widmowego w zakresie 480-860 nm promieniowania łuku spawalniczego w metodzie TIG. Celem badań było sprawdzenie możliwości wykorzystania promieniowania widzialnego łuku spawalniczego do monitorowania jakości procesu spawania. W ramach badań określono wpływ parametrów spawania (natężenie prądu spawania, długość łuku spawalniczego, rodzaj gazu osłonowego) na promieniowanie łuku spawalniczego. Eksperymenty ujawniły, że zmiany długości łuku w zakresie od l do 6 mrn i zmiany natężenia prądu spawania w zakresie od 25 do 200 A wpływają znacząco na promieniowanie elektromagnetyczne łuku spawalniczego. Wykonane doświadczenia pokazują kierunek kolejnych badań zjawiska promieniowania łuku spawalniczego i możliwości wykorzystania go do monitorowania on-line innych procesów spawania. Badania prowadzono na zautomatyzowanym stanowisku do spawania metodą TIG. Do rejestracji rozkładu widmowego wykorzystano spektrofotometr światłowodowy.

EN

The results of investigation spectrum of welding arc light in the range of 480-860 nm are presented. The main goal of these researches was to check that welding arc light can be seen as a signal carrying essential information about the welding process and exploiting in the monitoring of the welding process. Conditions of arc burning were modified by changing the welding parameters (welding current and arc length). The changes of welding current in the range of 25-200 A and arc length in the range of 1-6 mm influence significantly on spectrum of arc light emission. The investigation results indicate the next steps of researchers of arc light radiation phenomena and possibilities of application of this unconventional method to monitoring on-line another welding processes. To data acquisition of spectrum of arc light the advanced spectrophotometers was used.

13

Promieniowanie widzialne łuku spawalniczego metody TIG

Węglowski M. S., Kępińska M., Mikno Z.

Archiwum Odlewnictwa

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2006

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R. 6, nr 21/2

243-248

PL

W pracy przedstawiono wyniki rozkładu widmowego w zakresie 340÷500 nm promieniowania łuku spawalniczego metody TIG. Głównym celem badań było określenie wpływu parametrów spawania (natężenie prądu spawania, długość łuku spawalniczego, rodzaj gazu osłonowego) na promieniowanie łuku spawalniczego. Badania przeprowadzono na zautomatyzowanym stanowisku do spawania metodą TIG. Do rejestracji rozkładu widmowego wykorzystano spektrofotometr światłowodowy.

EN

Welding arc light can be seen as a signal carrying essential information about the welding process and exploiting in the monitoring of the welding process. Results of experimental research on the radiation of the welding arc of TIG welding methods are presented. The range of tested wave length was limited to visible radiation of the welding arc. Conditions of arc burning were modified by changing the welding parameters. Changes in welding condition mainly influence the intensity of emission.