Wyniki wyszukiwania - BazTech

1

Dynamic Signal Strength Mapping and Analysis by Means of Mobile Geographic Information System

Kulawiak M., Wycinka W.

Metrology and Measurement Systems

|

2017

|

Vol. 24, nr 4

595--606

EN

Bluetooth beacons are becoming increasingly popular for various applications such as marketing or indoor navigation. However, designing a proper beacon installation requires knowledge of the possible sources of interference in the target environment. While theoretically beacon signal strength should decay linearly with log distance, on-site measurements usually reveal that noise from objects such as Wi-Fi networks operating in the vicinity significantly alters the expected signal range. The paper presents a novel mobile Geographic Information System for measurement, mapping and local as well as online storage of Bluetooth beacon signal strength in semireal time. For the purpose of on-site geovisual analysis of the signal, the application integrates a dedicated interpolation algorithm optimized for low-power devices. The paper discusses the performance and quality of the mapping algorithms in several different test environments.

2

Złożoność obliczeniowa algorytmów energooszczędnych przejazdów tramwaju z silnikami indukcyjnymi przy zakłóceniach ruchu

Rawicki S., Nowak M., Różański M., Wycinka W.

Poznan University of Technology Academic Journals. Electrical Engineering

|

2012

|

No. 72

233--240

PL

W artykule przedstawiono metodę obliczania energooszczędnych przejazdów tramwaju z połowo zorientowanym sterowaniem trakcyjnych, trójfazowych silników indukcyjnych. Uwzględniono występowanie w ruchu miejskim różnych zakłóceń ruchu oraz skomplikowanego profilu trasy. Dynamika jazdy miejskiej prowadzi do szczególnie złożonych algorytmów przejazdów tramwaju, które uwzględniają kryterium minimalnego zużycia energii elektrycznej. Zaproponowane metody obliczeniowe obejmują również procedurę likwidacji opóźnienia po ustąpieniu zakłóceń w ruchu przy minimum zużycia energii. Dodatkowo wykazano, że podczas etapu jazdy ze stałą prędkością, gdy obciążenie silników trakcyjnych nie jest duże, odpowiedni dobór obniżonej wartości napięcia zasilającego pozwala na zwiększenie sprawności układu napędowego.

EN

The paper presents the method of the calculation of the energy-saving traffic of tram vehicle with field-oriented control of traction three-phase induction motors. Possibility of occurrence of various traffic disturbances and complicated route profile is taken into consideration. After ending disturbances of the city traffic, algorithms of tram rides take into account the procedure of traffic-delay liquidation according to the criterion of the minimum energy consumption. During the phase of the running with the constant speed, the load of traction motors is small; in this case the suitable choice of the lower supply voltage makes possible enlargement of the driving system efficiency.

3

Calculation of energy - saving traffic of tram vehicle with field - oriented control of traction induction motors

Rawicki S., Nowak M., Różański M., Wycinka W.

Pojazdy Szynowe

|

2011

|

Nr 3

57-61

EN

The paper deals with the problems of the tram vehicle control according to the criterion of the minimum electric energy consumption. The authors have extended the methodics given in literature and have elaborated the algorithm of the energy-saving tram traffic taking into consideration various ride disturbances. During the running within the framework of the city conditions tram ride parameters change frequently. The mathematical models take into account the field-oriented control of traction three-phase squirrel-cage induction motors. Determination of the run algorithm ensuring the minimization of the electric energy use has been realized by application of the optimization procedure.