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 "maneuver" wg kryterium: Wszystkie pola

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-6 z 6
    Tytuł:
    Selected aspects of motor vehicle dynamics on the example of a power-off straight line maneuver
    Autorzy:
    Kisilowski, Jerzy
    Zalewski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/224116.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    motor vehicle dynamics
    power-off
    straight line maneuver
    traffic safety
    dynamika pojazdu samochodowego
    wyłączenie zasilania
    manewry po prostej
    bezpieczeństwo ruchu
    Opis:
    In this paper the selected phenomena related to motor vehicle’s motion have been considered basing on a computer simulation. The vehicle performed a power-off straight line maneuver with different road conditions being included. All simulations have been performed in the MSC Adams/Car environment based on the available sports two-seater vehicle model, realizing the adopted maneuver at the instant speed of 100km/h. This enabled observation of the selected phenomena along the road long enough to relate them to different aspects of vehicle dynamics research. As for the randomly uneven road, almost similar and almost different profiles have been assumed for the left and right wheels of the vehicle. Additionally, two values of the coefficient determining the maximum amplitude of road irregularities have been selected: 0.3 for lower and 0.9 for higher irregularities, so the road surface conditions along with the flat road have been considered as one of the factors causing disturbances of the motor vehicle motion. Such research seems valuable from the point of view of road traffic safety and vehicle maintenance. This specific example is a presentation of the possible research on vehicle dynamics as well as a potential background for further considerations including different types of vehicles along with almost different road profiles for the left and right wheels of the given vehicle model. A power-off straight maneuver is not performed very often in normal road traffic. However, such test could be valuable when analyzing influence of the selected motor vehicle parameters, such as uneven loading, suspension characteristics, etc. on such maintenance features as stability, steerability and the influence of external disturbances acting on the moving vehicle. Further research provides different maneuvers and different simulation conditions.
    Źródło:
    Archives of Transport; 2019, 50, 2; 57-76
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Empirical modeling of the relationship between decision sight distance and stopping sight distance based on AASHTO
    Autorzy:
    Bassan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/224006.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sight distance
    stopping
    maneuver
    speed
    deceleration
    decision
    odległość
    zatrzymanie
    manewr
    prędkość
    zmniejszenie prędkości
    Opis:
    The paper introduces implementation of highways' stopping sight distance (SSD) and decision sight distance (DSD) based on AASHTO modeling assumptions. SSD characterizes the necessary distance for highway vehicles to stop safely in front from an obstacle. SSD is a function of vehicle speed, perception reaction time, deceleration rate, and grade based on AASHTO and most highway design international guidelines. The deceleration rate which is assumed constant (3.4 m/sec2) based on AASHTO 2011 is generally controlled by the friction coefficient depending on the road surface conditions. A driver's demanded deceleration rate may not exceed the range of friction coefficient according to various pavement conditions. Although SSD is generally sufficient to allow skilled and alert drivers to the stop their vehicles under regular situations, this distance is insufficient when information is difficult to comprehend. A DSD should be provided in highways geometric design when the driver is required to detect an unexpected or difficult to perceive information source. Interchanges (specifically exit ramps) and intersections, and required changing in driver direction of travel, changes in the basic cross section such as toll plaza, lane drop, are typical scenarios where driver needs DSD in the safety manner. The introduction of the two sight distance types (SSD and DSD) is a perquisite for empirical modeling of the relationship between DSD and SSD. The modeling refers to DSD for rural highways, suburban roads, and urban roads based on AASHTO models. Specifically the paper covers DSD three avoidance maneuver types of stopping (types A, A1, B) and three maneuver types of speed, path, and direction changing (types C,D, E) for the three roadway categories. The major parameters that control these avoidance types are pre-maneuver times, and pre-maneuver plus maneuver times. The empirical relationship proposed in this study simplifies the process of evaluating the decision sight distance based on stopping sight distance record, based on AASHTO models, without the need of strenuous estimation of the DSD model maneuver and deceleration parameters. Such a simplified correlation has not been found in the literature except a rough approximation documented in the British highway design guidelines.
    Źródło:
    Archives of Transport; 2018, 48, 4; 7-25
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An example of a power-off maneuver of a vehicle without a straight line motion control
    Autorzy:
    Kisilowski, Jerzy
    Zalewski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1832920.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vehicle dynamics
    power-off
    no motion control
    motion control
    dynamika pojazdu
    wyłączanie
    brak kontroli ruchu
    kontrola ruchu
    Opis:
    In this paper some selected results related to motor vehicle dynamics have been presented basing on the computer simulations of a sports two-seater performing a power-off straight line maneuver with different road conditions and the lack of a straightline motion control having been included. All simulations have been performed in the MSC Adams/Car environment and the adopted maneuver was performed at the instant speed of 100km/h-1. The selected phenomena have therefore been observed along the road long enough to relate them to different aspects of vehicle dynamics and the road traffic safety research. The adopted vehicle’s model moved along the flat and the randomly uneven road with the almost similar and the almost different profiles for the left and the right wheels. Additionally, two values of the coefficient determining the maxi-mum amplitude of road irregularities have been selected, i.e., 0.3 for the lower and 0.9 for the higher irregularities. This meant that the road conditions have been considered as one of the main factors possibly affecting disturbances of the motor vehicle’s motion. Such research seems valuable from the point of view of the road safety and the vehicles’ maintenance. A power-off straight maneuver is not very often performed during the normal road traffic and might seem useless. However, in this case it seemed essential to test the response of a vehicle’s model to such factors as, e.g., the uneven loading, suspension characteristics, etc. This in turn might prove valuable when considering, e.g., the additional concentration of a driver to overcome the external disturbances acting on a moving vehicle. The presented research is the second part of the paper (Kisilowski, 2019) where the power-off maneuver was considered but with the straightforward motion control. Here, the straight-line control has been switched off to examine an untypical situation where, for example a driver loses consciousness, and the vehicle moves freely along the road.
    Źródło:
    Archives of Transport; 2021, 58, 2; 63-80
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling Articulated Vehicles with a Flexible Semi-Trailer
    Modelowanie pojazdów wieloczłonowych z uwzględnieniem podatności naczepy
    Autorzy:
    Warwas, K.
    Adamiec-Wójcik, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/139542.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rigid finite element method
    overtaking maneuver
    optimization
    genetic algorithms
    metoda sztywnych elementów skończonych
    manewr wyprzedzania
    optymalizacja
    algorytm genetyczny
    Opis:
    The paper presents a model of an articulated vehicle with a flexible frame of a semi-trailer. The rigid finite element method in a modified formulation is used for discretisation of the frame. In order to carry out effective numerical simulation, a reduced model with a considerably smaller number of degrees of freedom is proposed. The parameters of the reduced model are chosen in an optimization process by using a genetic algorithm. To this end, it is assumed that the full and reduced model have to be similar in the range of static deflections and frequencies of free vibrations. Numerical simulations are concerned with the influence of the flexibility of the frame on the motion of the articulated vehicle during an overtaking maneuver. Results are presented and discussed.
    W artykule przedstawiono model samochodu wieloczłonowego z uwzględnieniem podatnej ramy naczepy. Do dyskretyzacji ramy wykorzystano metodę sztywnych elementów skończonych. W celu przeprowadzenia efektywnych numerycznie symulacji dynamiki zaproponowano model uproszczony, którego ruch opisano przy pomocy znacznie mniejszej liczby stopni swobody. Parametry modelu uproszonego dobrano w procesie optymalizacji z wykorzystaniem algorytmów genetycznych zakładając, że ugięcia statyczne oraz określona liczba pierwszych częstości drgań własnych muszą być takie same w modelach uproszczonym i pełnym. Przedstawiono wyniki obliczeń numerycznych dotyczące wpływu podatności ramy naczepy na ruch pojazdu podczas manewru wyprzedzania.
    Źródło:
    Archive of Mechanical Engineering; 2013, LX, 3; 389-407
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elements of perfect order rate research in logistics chains
    Autorzy:
    Jacyna-Gołda, Ilona
    Kłodawski, Michał
    Lewczuk, Konrad
    Łajszczak, Marcin
    Chojnacki, Tomasz
    Siedlecka-Wójcikowska, Teresa
    Powiązania:
    https://bibliotekanauki.pl/articles/223482.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sight distance
    decision
    stopping
    maneuver
    speed
    deceleration
    logistics chains
    order rate research
    ocena stanu zamówienia
    łańcuch logistyczny
    Opis:
    Perfect order rate (POR) is one of the superior measures of the logistics processes quality. POR is at the top of the hierarchy of key performance indicators (KPI) in supply chain and is considered as difficult to define and measure. Perfect order rate is composed of sub-measures touching technical, economic, quality and safety aspects of logistics processes. POR directly defines what the organization considers to be the perfect implementation of its tasks (and thus sets goals for the organization) and, secondly, measures the degree of achievement of these goals. The paper defines the concept of perfect order rate by including new elements to classic definition, so far rarely considered in the literature: possibility of order implementation according to standard procedures in organization and safety aspects. The concept of logistics chain and the impact of its functioning on the POR value have been defined. The picking and replenishment processes were discussed in detail as the basic elements affecting the quality of logistics processes and the value of POR. Next, the issues of logistic processes safety in warehouse facilities were discussed. The large intensity of warehouse operations along with their mechanization and automation very often leads to many hazards in warehouses and logistics chain. These hazard are usually related with warehouse workers safety. However, they can also lead to various delays or downtime in the material flows, as well as damage or reducing the quality of materials. So it was assumed that safety aspects can influencing the value of POR in the logistics chain. Due to conducted research and compiled reports indicate that many accidents in the warehouse are associated with the forklifts use as equipment for material handling. Therefore, in paper main attention was paid to hazards related with forklifts, warehouse safety speed, etc.
    Źródło:
    Archives of Transport; 2019, 49, 1; 25-35
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of helicopter H-V zone and cueing the emergency maneuver after power loss
    Przewidywanie stref H-V śmigłowca i manewru awaryjnego po utracie mocy napędu
    Autorzy:
    Stanisławski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/140256.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    śmigłowiec
    helikopter
    utrata mocy napędu
    strefa H-V
    helicopter
    power loss
    H-V zone
    Opis:
    The paper presents the results of simulation method for prediction of helicopter H-V zone envelope, in the case of engine power loss. Depending on the loss rate of available power, the emergency maneuver for flight continuation is calculated, or the autorotation landing is predicted. The realization of an airborne device with in-built calculating procedure and graphic presentation of H-V zone predicted limits can improve safety level of helicopter flight, and can cue the pilot to make proper decision in emergency conditions. The results of emergency meneuver simulation were verified by comparing them with flight tests of Mi-2Plus helicopter for partial power unit failure, and with records of SW-4 helicopter autorotation landing. The operation of measurement-recording module, which consists of GPS receiver, inertial measurement unit and a computer of PC-104 standard, was checked during flight tests of a radio-controlled helicopter model.
    Przedstawiono wyniki symulacyjnego przewidywania granic stref H-V dla śmigłowca w przypadku utraty mocy napędu. W zależności od stopnia spadku mocy wyznaczana jest możliwość manewru kontynuacji lotu lub przewidywane jest lądowanie autorotacyjne. Pokładowe urządzenie z wprowadzoną procedurą obliczeniową oraz graficzną prezentacją granic stref H-V może zwiększyć bezpieczeństwo lotów śmigłowca. Wyniki obliczeń symulacyjnych weryfikowano porównując z zapisami z badań w locie śmigłowców Mi-2Plus i SW-4. Pracę modułu pomiarowego obejmującego odbiornik GPS i komputer standardu PC-104 testowano przy wykorzystaniu sterowanego modelu śmigłowca.
    Źródło:
    Archive of Mechanical Engineering; 2010, LVII, 1; 21-44
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    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