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Wyświetlanie 1-15 z 1196
Tytuł:
The influence of the police on vehicle speed in built-up areas
Autorzy:
Dębiński, Marcin
Bohatkiewicz, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2116450.pdf
Data publikacji:
2022
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
speed
traffic safety
police
speed management
Opis:
In many cases, the effects of road accidents have significant impact on human health. This translates directly into society, in both material and emotional terms. The severity of the injury in a road event depends largely on the speed of the vehicles. Excessive vehicle speed is of particular concern in incidents involving vulnerable road users. As confirmed by literature analysis and research, in most cases drivers do not respect the speed limits introduced by the road signs. Existing solutions allow to introduce permanent or temporary speed control. This paper investigates speeding and driver behaviour in built-up areas near schools and pedestrian crossings. The aim of the research described in the paper is to determine the influence of the effectiveness of police actions on speed reduction and improvement of road safety.
Źródło:
Budownictwo i Architektura; 2022, 21, 2; 17--30
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of amplitude-based and phase-based method for speed tracking in application to wind turbines
Autorzy:
Urbanek, J.
Barszcz, T.
Sawalhi, N.
Randall, R. B.
Powiązania:
https://bibliotekanauki.pl/articles/220435.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
speed tracking
speed estimation
instantaneous frequency
wind turbines
Opis:
Focus of the vibration expert community shifts more and more towards diagnosing machines subjected to varying rotational speeds and loads. Such machines require order analysis for proper fault detection and identification. In many cases phase markers (tachometers, encoders, etc) are used to help performing the resampling of the vibration signals to remove the speed fluctuations and smearing from the spectrum (order tracking). However, not all machines have the facility to install speed tracking sensors, due to design or cost reasons, and the signal itself has to then be used to extract this information. This paper is focused on the problem of speed tracking in wind turbines, which represent typical situations for speed and load variation. The basic design of a wind turbine is presented. Two main types of speed control i.e. stall and pitch control are presented. The authors have investigated two methods of speed tracking, using information from the signal (without relying on a speed signal). One method is based on extracting a reference signal to use as a tachometer, while the other is phase-based (phase demodulation).Both methods are presented and applied to the vibration data from real wind turbines. The results are compared with each other and with the actual speed data.
Źródło:
Metrology and Measurement Systems; 2011, 18, 2; 295-303
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Validation of the New Visual Swimming Pace Control System in Real-Time
Autorzy:
Szczepan, Stefan
Zatoń, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/1055206.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
device validation
speed control system
swimming speed
visual information
Opis:
Controlling swimming speed, i.e. the intensity of physical activity, is an important factor in swimming training. The aim of this study was to validate the new “Swimming Pace Control System” (SPCS) for the control of swimming speed in real time using visual information. Submerged at the bottom of the pool was a system equipped with LEDs and software that informed the swimmer of the appropriate distance and swimming speed. A validation test was completed with an accuracy of ±200ms which compared the predetermined time for the beam of light emitted by the SPCS and the times achieved and recorded by the electronic starting system; “Colorado Time System” (Colorado Time, USA). The average time required to move the beam simulated by the SPCS at fixed distances (150 m, 100 m, 50 m) was within the assumed error of measurement (500 ms). SPCS was proven to be useful for control of swimming speed in real-time with the aid of visual information. The system gives an objective indication of swimming speed, thus it can be used in swimming training and during empirical research.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2017, 19, 3; 93-104
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of instantaneous shaft speed by advanced vibration signal processing-application to wind turbine gearbox
Autorzy:
Zimroz, R.
Urbanek, J.
Barszcz, T.
Bartelmus, W.
Millioz, F.
Martin, N.
Powiązania:
https://bibliotekanauki.pl/articles/220531.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
speed tracking
speed estimation
instantaneous frequency
spectrogram
wind turbines
Opis:
Condition monitoring of machines working under non-stationary operations is one of the most challenging problems in maintenance. A wind turbine is an example of such class of machines. One of effective approaches may be to identify operating conditions and investigate their influence on used diagnostic features. Commonly used methods based on measurement of electric current, rotational speed, power and other process variables require additional equipment (sensors, acquisition cards) and software. It is proposed to use advanced signal processing techniques for instantaneous shaft speed recovery from a vibration signal. It may be used instead of extra channels or in parallel as signal verification.
Źródło:
Metrology and Measurement Systems; 2011, 18, 4; 701-711
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of sea waving at fluctuation of instantaneous angular speed of ship’s propulsion shaft
Autorzy:
Dereszewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/243459.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnostics
low speed diesel engine
shaft's angular speed
wave influence
Opis:
The paper presents results of analysis how sea waves affect variation of angular speed of a propulsion shaft of the ship during sea passage. That information is necessary to evaluate the level of credibility of measurements taken as reference value for detection of main engine combustion failures and evaluation of cylinders’ contribution to total power based on shaft’s angular speed irregularity observations. Utilization of IAS (Instantaneous Angular Speed) for diagnostic purposes is mostly based on comparison of actual state measurement with characteristics taken during healthy engine run in certain outer conditions. All variations of atmospheric pressure and air temperature have noticeable impact at instantaneous value of angular speed, they and must be considered during comparison procedure. For marine propulsion set, two weather deriving factors, having impact at angular speed of the shaft, can occur. First one is mentioned above values of air temperature and air pressure, the second one is torque variations caused by changes of propeller’s draught due to pitch of the hull. Any deviations from sampling course of angular speed are treated as malfunction symptoms. The aim of analysis was to evaluate how pitching frequency affect run of IAS and how whether omitting of that impact can lead to wrong conclusions.
Źródło:
Journal of KONES; 2014, 21, 1; 59-65
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
The influence of chosen parameters on the Energy Efficiency Design Index
Autorzy:
Szelangiewicz, T.
Żelazny, K.
Powiązania:
https://bibliotekanauki.pl/articles/359074.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
Energy Efficiency Design Index
ship speed
decrease of ship speed
Opis:
Since 2013 Energy Efficiency Design Index (EEDI) for new ships will be enforced. Ships meeting the CO2 emission standards will be granted energy certificate required for their exploitation. The paper presents EEDI in the current form and influence of the ship speed and decrease of the ship speed on EEDI.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 1; 102-107
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pociągi dużych prędkości ICE4
High Speed trains class ICE4
Autorzy:
Graff, M.
Powiązania:
https://bibliotekanauki.pl/articles/249721.pdf
Data publikacji:
2012
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
kolej dużych prędkości
ICE4
high speed train
high speed railway
Opis:
Na początku XXI w. koleje niemieckie wraz z krajowymi producentami taboru kolejowego uzgodniły koncepcję nowych pociągów dużych prędkości, jakie miałyby zastąpić eksploatowane obecnie zespoły ICE1/2, ICE3 i ICE-T, plus pociągi konwencjonalne klasy IC/EC (robocze oznaczenie - ICx). Nowe pociągi byłyby zespołami trakcyjnymi przystosowanymi do kursowania z prędkością maksymalną od 230 km/h do 330 km/h, zestawionymi od 7 do 16 wagonów, z różną liczbą wagonów napędnych (zastosowano by napęd rozproszony), w ogółem 24 konfiguracjach. Jednym z pociągów opracowanych w ramach projektu ICx są zespoły ICE4, których modyfikacji DB zamierzają eksploatować w relacjach Frankfurt/Amsterdam - Londyn (przez Eurotunnel), na trasach długości 821/586 km.
Źródło:
TTS Technika Transportu Szynowego; 2012, 5-6; 54-55
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The novel control method of switched reluctance generator
Autorzy:
Bogusz, P.
Powiązania:
https://bibliotekanauki.pl/articles/140482.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
switched reluctance generator
electric vehicle
current control
low speed
high speed
Opis:
In the paper, a novel control method of a switched reluctance generator was discussed. The presented control method allows a rotor rotating at high speed to enter the continuous-conduction mode which causes an increase of generated output power. A control function of the presented method was given as well as simulation and laboratory tests.
Źródło:
Archives of Electrical Engineering; 2017, 66, 2; 409-422
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasonic Investigations of Inclusion Complexation of α-Cyclodextrin by DMSO in Pseudo-Binary Aqueous System
Autorzy:
Kaczmarek-Klinowska, M.
Hornowski, T.
Skumiel, A.
Jażdżewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/178073.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic speed
compressibility
complexation
Opis:
The paper reports the study of the complexation processes in aqueous solution of α-CD and DMSO. Cyclodextrins (CDs) (sometimes called cycloamyloses) are cyclic oligosaccharides formed by glucose units interconnected by α-(1,4) linkages; α-CD is one of three the most common CDs. It consists of six glucopyranose units. The speed of ultrasonic waves has been measured by the resonance method on ResoscanTM System apparatus. Some collateral data, such as density and heat capacity of the system, have also been measured. On the basis of the experimental data the excess adiabatic compressibility was determined. The extremes of the excess adiabatic compressibility function for different mixture compositions allowed us to establish the composition of molecular complexes formed in the solution. The obtained results suggest the formation of the α-CD with DMSO inclusion complexes with chemical stoichiometric ratio value of 1:1.
Źródło:
Archives of Acoustics; 2015, 40, 4; 569-574
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-speed infrared imaging for analysis of a diesel engine supplied with a premixed methane-air charge
Autorzy:
Lagueux, P.
Tremblay, P.
Savary, S.
Farley, V.
Mancaruso, E.
Sequino, L.
Kastek, M.
Firmanty, K.
Powiązania:
https://bibliotekanauki.pl/articles/114325.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
High-Speed Infrared Imaging
Opis:
Efforts are continuously made for improving internal combustion engines (ICEs) efficiency. Lowering fuel consumption and reducing soot formation are among the challenges being addressed when seeking to improve engine designs. In this work, ICEs characterization was carried out on an elongated single-cylinder transparent diesel engine equipped with the multi-cylinder head of a commercial passenger’s car and a common rail injection system. The engine uses a conventionally extended piston where part of the piston’s crown is replaced by a sapphire window. In this configuration, a full view of the combustion bowl can be achieved while the engine is in operation by looking at a 45° fixed mirror located in the extended piston axis. Infrared imaging was carried out at 26 kHz, leading to a temporal resolution of about 0.35° crankshaft angle, at 1500 RPM, in the engine’s reference frame. The different phases of a combustion cycle, i.e. intake, compression, fuel injection, working stroke and exhaust, were investigated using four different spectral filters (broadband, CO2 red-spike, through-flame and hydrocarbons). In the experiment, air was replaced by a premixed air-methane charge in order to improve combustion and lower the amount of soot deposits. The results illustrate the potential of high-speed IR imaging as a diagnostic tool for ICEs.
Źródło:
Measurement Automation Monitoring; 2017, 63, 2; 60-64
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maximum locomotor speed of the best football players at the FIFA World Cup in Brazil
Autorzy:
Bojkowski, Łukasz
Śliwowski, Robert
Wieczorek, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1055245.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
World Cup
football
speed
Opis:
In comprehensive preparation of a player to football competition special attention is paid to his predispositions in terms of speed abilities. Therefore, the authors’ objective was to analyse maximum locomotor speed of players of the four best national teams competing during the FIFA World Cup in Brazil, including specifying the differences in terms of speeds of these national teams and players in corresponding playing positions of individual teams. The analysis used data obtained using the Castrol Performance Index, a kinematic method and in order to present significance of differences between the studied teams and playing positions one-way analysis of variance (ANOVA) was performed. The study showed that the mean maximum running speed of the players of the four best teams of the World Cup was 8.34 metres/ second. The mean maximum locomotive speed of the defenders in semi-finalist teams of the tournament was 8.29 m/s, while the midfielders’ speed was – 8.16 m/s, the forwards’ – 8.48 m/s and the goalkeepers’ – 7.40 m/s. The players who had a maximum speed of 9 m/s or more were the Dutchman Ron Vlaar (9.16 m/s) and the Argentines José María Basanta (9.09 m/s) and Ángel Di Maria (9.17 m/s). There is no significant difference between the world’s best teams, including between their corresponding playing positions, in the level of maximum running speeds determining the dynamics of the game.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2016, 16, 4; 103-110
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Approach to Modelling the Ship Performance in Application to Ferry "Stena Baltica"
Autorzy:
Jurdziński, M.
Guze, S.
Powiązania:
https://bibliotekanauki.pl/articles/320801.pdf
Data publikacji:
2010
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
navigation
ships' speed characteristic
Opis:
The paper deals with analysis of ships speed characteristic in open water areas effected by environmental constraints influencing on ship sea keeping parameters in application to ferry "Stena Baltica" operated in the Baltic Sea between Gdynia and Karlskrona harbors.
Źródło:
Annual of Navigation; 2010, 16; 55-66
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Wyświetlanie 1-15 z 1196

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