Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "speed factor" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-6 z 6
    Tytuł:
    Performance evaluation of bucket based excavating, loading and transport (BELT) equipment – an OEE approach
    Ocena działania systemu złożonego z urządzeń do urabiania, załadunku oraz transportu – podejście oparte o całościową ocenę efektywności
    Autorzy:
    Mohammadi, M.
    Rai, P.
    Gupta, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/218889.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    całościowa ocena efektywności
    pomiar wydajności
    wykorzystanie sprzętu
    tempo prac
    ładowność
    sprzęt górniczy
    OEE
    performance measurement
    availability
    utilization
    speed factor
    bucket capacity
    mining equipment
    Opis:
    Overall Equipment Effectiveness (OEE) has been used since last over two decades as a measure of performance in manufacturing industries. Unfortunately, enough, application of OEE in mining and excavation industry has not been duly adopted. In this paper an effort has been made to identify the OEE for performance evaluation of Bucket based Excavating, Loading and Transport (BELT) equipment. The conceptual model of OEE, as used in the manufacturing industries, has been revised to adapt to the BELT equipment. The revised and adapted model considered the operational time, speed and bucket capacity utilization losses as the key OEE components for evaluating the performance of BELT equipment. To illustrate the efficacy of the devised model on real-time basis, a case study was undertaken on the biggest single bucket excavating equipment – the dragline, in a large surface coal mine. One-year data was collected in order to evaluate the proposed OEE model.
    Podejście oparte o całościową ocenę efektywności używane jest od ponad dwóch dekad w analizach skuteczności działania urządzeń w przemyśle wytwórczym. Niestety podejście to nie zostało szeroko przyjęte w przemyśle górniczym. W pracy tej podjęto próbę dokonania całościowej oceny efektywności pracy układu złożonego ze sprzętu do urabiania, załadunku (koparki) oraz transportu. Model koncepcyjny podejścia całościowej oceny stosowany dotychczas w przemyśle wytwórczym został zaadaptowany by uwzględniać specyfikę systemów urabiania, ładowania i transportu. Odpowiednio zmodyfikowany model uwzględnia czas pracy układu, tempo pracy, spadek ładowności koparki i spowodowane w ten sposób straty, umożliwiając dokonanie całościowej oceny wydajności pracy systemu. Poprawność opracowanego modelu działającego w czasie rzeczywistym zbadano na przykładzie systemu do urabiania, załadunku i transportu wykorzystywanego w dużej kopalni odkrywkowej węgla. Do oceny poprawności modelu wykorzystano zebrane dane obejmujące cały rok pracy urządzeń.
    Źródło:
    Archives of Mining Sciences; 2017, 62, 1; 105-120
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of meteorological factors on the radial growth of pine latewood in northern taiga
    Autorzy:
    Neverov, N.
    Chistova, Z.
    Mineev, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106664.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    late wood
    pine
    meteorological factor
    air temperature
    wind speed
    taiga
    Opis:
    The purpose of this study is to evaluate the influence of day and night meteorological parameters (air temperatures and dew points, relative humidity, wind speed and precipitation) on the radial growth of pine latewood in northern taiga, in typical conditions of its growth. The study was conducted in the north of the Arkhangelsk region (Russia). A total of 63 cores were selected from seven most representative sites. Meteorological parameters were obtained from the WMR 918 H digital weather station (Huger GmbH, Germany), located directly on the study area and operating in monitoring mode. The analysis used meteorological data for the period 2008–2015. Correlation with night and day air temperature in June and July (0.72–0.77) was revealed in blueberry type. In all the stands studied, a reliable correlation with wind speed was established, direct (0.77‒0.88) and inverse (−0.7 to −0.99), but each sample plot had an individual dependence. A reliable correlation with the humidity of August and September (0.64–0.87) and an inverse correlation with precipitation in May and August (−0.63 to −0.75) were established. In general, pine in blueberry, cowberry and pine on swamp types have a similar reaction to the variability of meteorological factors, the most important of which is the temperature regime of air and wind speed.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 1; 7-14
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining the best possible speed of the ship in shallow waters estimated based on the adopted model for calculation of the ship’s domain depth
    Autorzy:
    Rutkowski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1573899.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    safe speed
    best possible speed
    optimal speed
    ship’s domain
    safety depth
    under keel clearance (UKC)
    navigational risk factor
    ship squat
    Opis:
    The purpose and scope of this article is to present the best marine practices used to determine the ship’s domain depth (compared to the safety depth parameter in ECDIS) and the safest and best possible speed (also known as optimal speed) of the ship in restricted sea areas limited by the depth of navigation waters. The author also presents a method that can be used to estimate the safe speed of a ship in shallow waters and the so-called navigational risk factor (specified in the range from 0 to 1), using the safety depth parameter specified in ECDIS based on the analysis of a three-dimensional model of the ship’s domain. The essence of the method proposed in this paper is a systematic approach to the operation of a seagoing ship in the aspect of assessing its navigation safety (navigational risk factor) when manoeuvring in restricted sea areas, in particular in shallow waters including navigable canals and fairways.
    Źródło:
    Polish Maritime Research; 2020, 3; 140-148
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Researches of pneumatic sowing machine with peripheral cells location and inertial superfluous seeds extraction
    Autorzy:
    Vasylkovska, K.
    Vasylkovskyy, O.
    Anisimov, O.
    Trykina, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/410833.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    pneumatic seeding machine/device
    seed disc
    experiment
    cells filling factor
    dilution
    cells angular speed
    Opis:
    In the article we provide the new design of pneumatic sowing machine with peripheral cells on the seed disk and a passive device for removing extra seeds with inertia method for precise seeding of cultivated crops. A series of studies was proposed for sugar beet seeds sowing device, we defined the influence of dilution in a vacuum chamber of sowing device and angular velocity cell seed disk on the cells filling factor. The design of the new pneumatic sowing machine can significantly reduce the vacuum in the system having increased the angular speed in cell seed disk to the values of seeding device travelling speed, thus provide a constant point of seeds drop from the seed disc at the same trajectory of their flight to the furrows and the qualitative cells filling. To determine the rational parameters and modes of sowing device we used method of multifactor experiment planning. We determined the main levels and intervals of varying factors for sugar beet sowing along with determining the filling factor of cell seed disk. With application of package Statistica 6.0. for parameter optimization - cell seed disk filling factor was constructed response surface and line of even output.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 4; 85-89
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the efficiency of a gas-fueled ship power plant using a Waste Heat Recovery metal hydride system
    Autorzy:
    Cherednichenko, Oleksandr
    Tkach, Mykhaylo
    Timoshevskiy, Boris
    Havrysh, Valerii
    Dotsenko, Serhii
    Powiązania:
    https://bibliotekanauki.pl/articles/135623.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    waste heat recovery
    low-speed engine
    metal-hydride
    hydrogen
    LNG-powered ship
    total waste heat utilization factor
    Opis:
    Due to environmental, energy, and operating cost constraints, the number of liquefied natural gas (LNG)–powered ships is increasing. To avoid decreasing the thermal efficiency of two-stroke, low-speed diesel engines, high-pressure gas injection is used. The specific energy consumption of a gas fuel compressor is around 0.35 kWh/kg, which has a negative impact on the efficiency of ship power plants. To reduce the primary energy consumption of a gas fuel supply system, waste heat recovery (WHR) technologies may be used. This study investigated whether WHR metal hydride technology was suitable for improving the efficiency of low-grade heat waste in marine diesel engines. The key factors of this technology were revealed, and the design scheme was described. Working fluids were also analyzed, and a mathematical model of a WHR metal hydride plant was developed, and the results were represented. The calculations showed that the above technology could increase the operating power of a propulsion plant by 5.7–6.2%. The results demonstrate the possibility of applying WHR metal hydride equipment for gas fuel compressor drives in LNG-powered ships. The novelty of this study lies in the investigation of metal hydride technology for application in the waste heat recovery systems of LNG-powered ships.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 59 (131); 9-15
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability-Based Assessment of Galloping Instability of Thin-Walled Steel Beams
    Autorzy:
    Nguyen, Huu Anh Tuan
    Powiązania:
    https://bibliotekanauki.pl/articles/27314733.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    instability
    wind speed
    Monte Carlo simulation
    reliability index
    safety factor
    niestabilność
    prędkość wiatru
    Monte Carlo
    wskaźnik niezawodności
    współczynnik bezpieczeństwa
    Opis:
    Galloping instability relating to cross-wind vibrations can be found in flexible and lightly damped structures. In the present paper, the reliability of a thin-walled steel beam in maintaining its galloping stability was examined using a probabilistic approach. The analysis considered random variation in the cross-sectional geometrical properties of the beam, the material elastic modulus, the structural damping and the wind speed. A large number of Monte Carlo simulations were performed with normal and Gumbel distributions applied to the random variables to determine the probability distribution function of the safety margin. The limit state is considered violated when the wind speed exceeds the onset wind velocity of galloping, resulting in the aerodynamic damping being greater than the structural damping. It was shown by a conventional codified safety factor method that the beam was robust enough for galloping stability. By contrast, the probability-based assessment revealed that the beam failed to achieve the target reliability index in case the coefficient of variation of wind speed was greater than 5%. The analysis results suggested that the code-satisfied slenderness of the beam should be reduced by a factor of 1.5-1.7 under the action of wind speed with a coefficient of variation in the range 30-40%.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 2; 23--35
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies