Temat: speed measurement - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Speed irregularity characteristic of low speed, two-stroke marine diesel engine applied as vessels main propulsion
Autorzy:: Kowalak, P.
Powiązania:: https://bibliotekanauki.pl/articles/244760.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
marine diesel engines
combustion processes
speed measurement
speed irregularity
Opis:: The piston engine irregularity is a consequence of the uneven power supply from the engine units. As such, it contains valuable information about engines units working process. Unfortunately, it is strongly influenced by torsional vibration, resonance, and propeller behaviour. In order to better understand the speed irregularity phenomena the instantaneous speed was recorded and its characteristic against engine mean speed was developed. Some statistical parameters: standard error and deviation as well as variance were determined. The results were compared with propulsion plant torsional vibration. The presented results show that the irregularity of the long stroke engine's speed is strongly influenced by torsional vibration phenomena. The analyzed engine has a bared speed range 37-43 rpm. Exactly around that range, the speed irregularity reaches its maximum values of 18% of mean speed. The analysis can be considered as qualitative look into the phenomena. However even based on the presented analysis one can observe some practical inferences. The common type of electronic indicators is used to simplify the measurement by assuming that the shaft speed is equal in between the pickup pulses. In order to increase the accuracy of the indicated power determination the use of such instrument should be avoided in the speed range, which is a multiple number of the barred speed. Due to the fact that the shaft speed is irregular especially in the ranges where torsional resonance may occur the piston positioning (for example for TDC determination) purpose procedure should take it into account.
Źródło:: Journal of KONES; 2008, 15, 4; 263-268
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The influence of sprint block start elements on initial velocity of 100 metre race
Autorzy:: Terczyński, Robert
Powiązania:: https://bibliotekanauki.pl/articles/1054601.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:: laser
reaction time
speed measurement
sprint start
velocity
Opis:: The aim of this paper was to investigate whether it is possible to evaluate the relationship between different phases of sprint start objectively. The participants of the research were the top level of elite National Sprint Team (8 female, 9 male). The run times were as follows: 10.39 ±0.12 s for men and 11.63 ±0.20 s for women. The data that were taken into account during the research in order to examine typical kinetic parameters of the sprint start were: reaction time, delay between simple reaction time and reaction time (IAAF), time to front peak force, time to rear peak force, delay between end of front force and gun signal and total start time. The analysis of the study identifies the major kinematic parameters of the phases of the sprint start and block acceleration that influence the results of sprint running. The following correlation analyses were conducted, a linear regression for the typical kinetic parameters of the sprint start, initial speed on 100 metre race. Finally, a simple coaching related model for the development of sprinting is presented which is consistent with scientific evidence recommendations for coaches to make changes in training.
Źródło:: Central European Journal of Sport Sciences and Medicine; 2014, 8, 4; 87-96
2300-9705
2353-2807
Pojawia się w:: Central European Journal of Sport Sciences and Medicine
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: GPS use to determine accurate speed
Autorzy:: Dębowska-Mróz, M.
Szychta, E.
Powiązania:: https://bibliotekanauki.pl/articles/393417.pdf
Data publikacji:: 2010
Wydawca:: Polskie Stowarzyszenie Telematyki Transportu
Tematy:: GPS
prędkość
pomiar prędkości
ruch drogowy
mobility
speed
speed measurement
road traffic
Opis:: The paper presents the importance of measurements and research in the road traffic as well as the most often used methods of speed measuring. Possibilities of GPS system use for speed measurements are described. Possibilities created by this method usage to determine the speed in the road traffic are shown.
Źródło:: Archives of Transport System Telematics; 2010, 3, 3; 56-60
1899-8208
Pojawia się w:: Archives of Transport System Telematics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Speed management efficacy on national roads – early experiences of sectional speed system functioning in Podlaskie voivodship
Autorzy:: Ziółkowski, R.
Powiązania:: https://bibliotekanauki.pl/articles/375385.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: speed management
sectional speed measurement
heterogeneity of speed
zarządzanie prędkością
prędkość odcinkowa
niejednorodność prędkości
Opis:: Driving speed is one of the most important factors in road safety, and speed not only affects the severity of a crash, but is also related to the risk of being involved in a crash. Inappropriate speed is responsible for more than a third of all fatal accidents occurring on the roads. In Poland, the problem of speeding drivers is widely common. Hence, effective speed management and enforcement of speed limits on existing road plays an important role. Possible solutions for rural roads are very limited and have focused mainly on administrative speed limitations and speed cameras enforcement. However, due to their limited effectiveness, new solutions are still being sought. High expectations are associated with the latest introduction of sectional speed system in Poland. The aim of this paper is to examine the efficiency of the sectional speed control system implemented on chosen sections of national roads in Podlaskie province. For this purpose, speed surveys included road segments where the system for sectional spede control had been already implemented, as well as in order to evaluate its effectiveness, speed measurements were conducted on other national roads with no further specific restrictions. In addition, to evaluate the possible influence of the sections monitored by the system on driver’s behaviour on adjacent segments, the relevant speed data was collected on adherent sectors. On the basis of the conducted measurements, high effectiveness of sectional speed control system was stated together with its impact on adjoining segments, but also some deficiency in terms of speed homogeneity has been revealed.
Źródło:: Transport Problems; 2018, 13, 2; 5-12
1896-0596
2300-861X
Pojawia się w:: Transport Problems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Quantitative Indicators of the Instantaneous Speed of a Ship’s Main Engine and its Usability in Assessing the Quality of the Combustion Process
Autorzy:: Chybowski, Leszek
Kazienko, Damian
Powiązania:: https://bibliotekanauki.pl/articles/2064695.pdf
Data publikacji:: 2020
Wydawca:: STE GROUP
Tematy:: internal combustion engine
speed measurement
cylinder misfire
quantitative indicators
condition monitoring
instantaneous speed
Opis:: A graph of the changes in an engine’s operating speed can be used to assess the quality of the combustion in its cylinders. In this paper, the authors carried out tests on a Buckau-Wolf R8VD-136 ship engine, which was directly driving the propeller. This engine is owned by the Laboratory of Marine Engine Rooms at the Maritime University of Szczecin. For standard rotational speeds ranging from 200 to 280 rpm, with increments of 20 rpm, the authors measured the changes in the instantaneous speed for the engine’s normal operating conditions (reference graphs) as well as with one of the cylinders being out of operation. A no-combustion situation was successively introduced into each cylinder for each preset rotational speed. The obtained graphs of the instantaneous speed were then used to determine certain quantitative indicators, which the authors believe can provide information about the technical condition of the engine. The analysis concerned the averaged graphs of the speed under the conditions set for five consecutive engine operating cycles. The indicators that were calculated included the maximum difference in the speed over the engine’s full operating cycle, the uniformity of the engine speed and the differential speed area factor, the latter a term that has been proposed by the authors. The values of the individual indicators that were obtained from the reference graphs and the graphs with no combustion in one of the cylinders were compared. All indicators are sensitive to cylinder misfire. Conclusions were then drawn on the usefulness of these indicators in assessing the condition of an engine.
Źródło:: Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 93--106
2545-2827
Pojawia się w:: Multidisciplinary Aspects of Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analiza prędkości przejazdu wyróżnionych grup rodzajowych pojazdów na skrzyżowaniach typu rondo
The distinguish vehicle groups speed analysis on roundabouts
Autorzy:: Macioszek, E.
Powiązania:: https://bibliotekanauki.pl/articles/197757.pdf
Data publikacji:: 2012
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: skrzyżowanie drogowe
rondo
prędkość jazdy
pomiar prędkości
crossroad
roundabout
driving speed
speed measurement
Opis:: W artykule przedstawiono wyniki badań prędkości pojazdów w czasie przejazdu przez skrzyżowanie typu rondo. Na tym typie skrzyżowań prędkość pojazdów zależy od parametrów geometrycznych ronda oraz od wartości natężeń ruchu. Artykuł prezentuje wyniki badań własnych autorki.
The results of research of distinguish vehicle groups speeds on roundabouts have been presented in his article. The vehicles speeds on roundabouts depends on geometrical parameters and on vehicle traffic volumes on particular elements of roundabouts. This article presented results of author own researches.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2012, 74; 59-66
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A Device for Measuring the Rotational Speed of a Chain Sprocket of a Petrol Chainsaw
Autorzy:: Wróbel, Mateusz
Jakubek, Bartosz
Rukat, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/2123289.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: magnetic field
chainsaw
rotational speed measurement
chain sprocket
hall effect sensor
Opis:: The procedure for determining the frequency-weighted RMS values of vibration accelerations in the case of petrol chainsaws proposes equal time shares of three operation modes of the chainsaw. In order to assess the actual operator’s vibration exposure, it is necessary to precisely determine the above-mentioned shares. In real-life conditions operation of chainsaws is characterized by frequent and significant rotational speed changes depending on the operation mode. Therefore, a prototype of dedicated device for measuring the rotational speed of a chain sprocket was developed. The article presents development requirements, encountered problems and their solutions, the prototype itself and functional test results.
Źródło:: Advances in Science and Technology. Research Journal; 2021, 15, 3; 99--107
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Opracowanie wskaźników oceny prędkości pojazdów w ruchu drogowym
The development of indicators to assess the speed of vehicles on the road
Autorzy:: Gołaszewski, A.
Marcinkowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/312209.pdf
Data publikacji:: 2017
Wydawca:: Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:: prędkość pojazdów
bezpieczeństwo ruchu drogowego
pomiar prędkości
speed of vehicles
road safety
speed measurement
Opis:: Prędkość pojazdów jest jednym z podstawowych czynników wpływających na poziom bezpieczeństwa ruchu drogowego i dlatego poprzez oddziaływanie na nią jesteśmy w stanie mieć wpływ na ten poziom. Jednak skuteczność starań w zakresie sprawowania kontroli nad prędkością warunkowana jest stopniem przestrzegania przez użytkowników ruchu drogowego różnego rodzaju ograniczeń i zaleceń. Główna część pracy skupia się na opracowaniu wskaźników oceny dla różnych prędkości dopuszczalnych. Istotną część pracy stanowią badania i analiza czynników determinujących wybór prędkości przez kierowców oraz stopień przestrzegania dopuszczalnych ograniczeń prędkości. Kolejna część pracy zawiera wyniki i analizę badań empirycznych prędkości, które posłużyły do stworzenia i określenia wartości współczynników charakteryzujących opracowane wskaźniki. W pracy został sformułowany ogólny wzór na wskaźnik oceniający prędkość poruszania się kierowców. Na podstawie opracowanych wskaźników i analizy przeprowadzonych badań przedstawiono wnioski i propozycję praktycznego zastosowania wskaźników oceny prędkości.
The speed of vehicles is one of the main factors affecting the level of road safety and therefore, by acting on it, we are able to have an impact on this level. However, the effectiveness of efforts to exercise control over the speed conditioned by the degree of compliance by road users all kinds of restrictions and recommendations. The main part of the work focuses on the development of evaluation indicators for different speed limits. An important part of the work is the study and analysis of the factors determining the choice of speed by drivers and the degree of compliance with the permissible speed limit. An extensive part of the work contains the results and analysis of empirical research speeds that were used to create and determine the factors characterizing the developed indicators. The work has been formulated general formula for evaluating the rate of speed of the drivers. Based on the developed indicators and analysis of the study presents conclusions and a proposal for the practical application of evaluation indicators speed.
Źródło:: Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 6; 175-178, CD
1509-5878
2450-7725
Pojawia się w:: Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Modelling the neural speed regulation system of PMSM motor in Matlab-Simulink
Autorzy:: Siwek, P.
Powiązania:: https://bibliotekanauki.pl/articles/378254.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: artificial neural networks
speed control
PMSM
motor drive model
direct-quadrature
speed measurement
back-propagation algorithm
Opis:: To implement speed regulation algorithms of PMSM motor on real object the exact model encompassing imperfections of digital measurement and AC-DC-AC converter is required. The aim of the following paper is to present this kind of simulation model of the neural speed regulation system of PMSM motor in Matlab – Simulink. In the beginning the direct-quadrature transform and mathematical model of permanent magnet synchronous motor in dq coordinate system are shown. The paper shows speed measurement algorithm which ensure digital character of the output data. In the second section the neural speed controller trained on-line by backpropagation algorithm and the method for calculating gradient of error function are described. At the end of the paper simulation results validating proper behaviour of neural speed regulation system of PMSM motor are shown.
Źródło:: Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 85; 365-376
1897-0737
Pojawia się w:: Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Wpływ prędkości pojazdów na wielkość emisji spalin na miejskim odcinku drogowym
Effect of speed of vehicles on the size of urban exhaust on the section road
Autorzy:: Jaroszek, M.
Wieszała, R.
Powiązania:: https://bibliotekanauki.pl/articles/196447.pdf
Data publikacji:: 2011
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: prędkość jazdy
spaliny
pomiar prędkości
miejski odcinek drogowy
driving speed
exhaust gas
speed measurement
urban road section
Opis:: W artykule określono wpływ średniej prędkości pojazdów samochodowych na wielkość emisji wybranych toksycznych składników spalin. Do realizacji tego celu niezbędne było wykonanie pomiarów prędkości na odcinku drogi na ul. Ofiar Katynia w Zabrzu. Zakres artykułu obejmował pomiary w trzech różnych porach dnia oraz różnych dniach tygodnia. Wielkość emisji wybranych toksycznych składników spalin została określona za pomocą programu komputerowego COPERT IV.
In this paper the influence of the average speed of vehicles on emissions of some toxic components of exhaust was showed. To achieve this goal it was necessary to perform measurements of speed on a road section on the street Victims of Katyn in Zabrze. The scope of work included measurements at three different times of day and different days of the week. The emissions of selected toxic components of exhaust gases was determined with a computer program COPERT IV.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2011, 70; 37-44
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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