Temat: vehicle acceleration - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigation of vehicle stability on road curves in winter conditions
Autorzy:: Kemzuraite, K.
Pukalskas, S.
Bureika, G.
Powiązania:: https://bibliotekanauki.pl/articles/247233.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vehicle stability
vehicle dynamics
road curve
road surface adhesion coefficient
lateral acceleration
road traffic safety
Opis:: The paper reveals peculiarities of a vehicle movement/operation on road curves when the road surface is slippery and/or snowy, with asphalt ruts. The survey of scientific works related to the lateral acceleration and movement dynamics of a vehicle is presented. Field experiments with different vehicles were carried out in winter conditions. The acceleration value and stability parameters depending on the speed of a vehicle and adhesion coefficient on road curves are analysed. Dependence of the vehicle lateral acceleration on road curves with various adhesion surfaces are given in graphical charts. Recommendations how to improve road safety by limitation of the speed in winter conditions are formulated. Finally, basic conclusions are given. Handling the vehicle on the road with the compressed snow surface (on the curve of the radius of 120 m) is much more dangerous when the adhesion coefficient of the wheels and the road is low if compared to handling the vehicle along the dry ruts at the same speed. When the vehicle moves along the curve of 120 m radius at a speed of 70 km/h, and the road surface is snowy, the lateral acceleration of 3.1 m/s2 is reached. The paper indicates that lateral acceleration of 3.1 m/s2 can be reached while moving along the snowy road with dry ruts at a speed higher in 27% (90 km/h). For improving the vehicle safety, it is recommended to have road signs on sharp turns/curves (R less than 120 m) to decrease the vehicle speed in 20 km/h.
Źródło:: Journal of KONES; 2011, 18, 4; 191-197
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Impact loads of combat vehicle hull in the context of humans tolerance limits
Obciążenia udarowe kadłuba wozu bojowego a granice odporności człowieka
Autorzy:: Rybak, P.
Papliński, K.
Powiązania:: https://bibliotekanauki.pl/articles/241971.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: wóz bojowy
badania
obciążenie
ciśnienie
przyspieszenie
combat vehicle
tests
loads
pressure
acceleration
Opis:: To ensure humans security in combat vehicles, while action condition thread especially in situation when troops take part in peace kipping missions in various world regions, is one of the most important direction of scientific teams investigation. Were described what kind of assumption is necessary to take into consideration when requirements for combat vehicles are formulated. Obviously that it is very difficult to achieve full security. However, when exist chance of partial security or to minimize impact loads results, generated by combat materials, should be taken advantage of it. In the paper were presented main factors which humans are endanger in combat vehicle, using published data as well as authors test results. Were put together tolerance limits for man when such factors affects. Presented results could contribute to point at further direction of investigations connected with man protection in the vehicle as well as searching for new technique and technology that could be used to limit bad results of considered events.
Zapewnienie bezpieczeństwa ludziom w wozach bojowych podczas działań w warunkach zagrożenia, szczególnie w sytuacji, gdy wojska biorą udział w misjach pokojowych w różnych regionach świata, jest jednym z ważniejszych kierunków działania zespołów naukowo - badawczych. Określono, jakie założenia należy uwzględnić przy formułowaniu wymagań dla wozów bojowych. Jest przy tym zrozumiałe, że trudno jest uzyskać pełne zabezpieczenie. Jednakże, jeżeli istnieje możliwość chociażby częściowej ochrony lub też zminimalizowania skutków obciążeń udarowych, generowanych środkami bojowymi, to należy ja wykorzystać. W pracy przedstawiono główne czynniki, na które jest narażony człowiek w wozie bojowym wykorzystując dane literaturowe jak i wyniki badań własnych. Zestawiono wartości graniczne odporności jego organów na tego typu obciążenia. Przedstawione rezultaty mogą przyczynić się do wskazania kierunków dalszych badań nad ochroną ludzi w pojazdach oraz poszukiwania nowoczesnych technik i technologii do zastosowania w aspekcie zmniejszenia skutków przedstawionych zdarzeń.
Źródło:: Journal of KONES; 2007, 14, 1; 331-342
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Methods for determining the take-off speed of launchers for unmanned aerial vehicles
Autorzy:: Jastrzębski, G.
Ułanowicz, L.
Powiązania:: https://bibliotekanauki.pl/articles/243050.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: aviation
unmanned aerial vehicle
take-off launcher
take-off speed
acceleration recorder
lotnictwo
bezzałogowy statek powietrzny
prędkość startu
rejestrator przyspieszenia
Opis:: Unmanned aerial vehicles (UAV) are currently a very rapidly developing type of aviation. The problem of support during the take-off with the use of, i.e. take-off launchers arose along with their development, especially for UAVs with weights and dimensions preventing manual take-off. One of the major issues associated with UAV take-off launchers is for its UAV accelerating element to obtain its initial speed. The article presents three methods of determining launcher take-off speeds for unmanned aerial vehicles, i.e. the concentrated very oblique projection method, the high-speed camera methods, and the acceleration recorder method. The take-off launcher carriage speed in the oblique projection method is determined from a formula. This method involves “ejections” of concentrated masses from the UAV mass range and measuring the component values resulting from the used formula, which contains the range of the oblique projection, the elevation of the projection and its angle. The method using the high-speed camera involves recording the course of ejections of the concentrated mass from the launcher. The average take-off speed is determined on the basis of a take-off run length (section of the launcher race, where the unit accelerates) and defining the start and end frame of the carriage movement. The third method for the determination of the take-off speed utilizes an acceleration recorder. The method with the recorder involves registering a change in the accelerations when the take-off carriage is being accelerated by a system fixed on the carriage or the accelerated object. The article presents the methodology of dynamic tests of object acceleration on a launcher, necessary for the determination of speed with the mentioned methods. Selected results from actual tests with the use of the 01/WS/2015 launcher, which is an element of the ZOCP JET2 set, were presented. The test results are presented in a tabular form. The methods for the determination of the take-off speed were compared on the basis of performed tests. Based on the obtained results, the factors impacting the accuracy of each of the methods were identified.
Źródło:: Journal of KONES; 2018, 25, 1; 170-176
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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