Temat: road adhesion - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigation of adhesion characteristics of different tyre types in different weather conditions
Autorzy:: Pokorski, J.
Reński, A.
Sar, H.
Powiązania:: https://bibliotekanauki.pl/articles/246790.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: tyre-to-road adhesion
skid resistance tester
traffic safety
accident reconstruction
Opis:: Tyre-to-road adhesion has a great influence on transmitting forces between wheels and road surface and in the consequence on the safety of automobile motion. It plays significant role in vehicle motion modelling, especially for the needs of traffic accidents reconstruction and the development of active safety systems in automobiles. Simultaneously, the knowledge about tyre-to-road adhesion is limited, especially in case of the differences between anti-slip properties of summer and winter tyres. In the paper, method of the measurement of tyre-to-road adhesion coefficient is presented. The measurement system SRT-4 consists of special dynamometer trailer, towing vehicle and test-measuring equipment. It was designed for the needs of road engineering and further developed in the Institute of Vehicles of Warsaw University of Technology. It enables to obtain adhesion characteristics, i.e. graph of adhesion coefficient as a function of wheel slip ratio. In the article, examples of tyre-toroad adhesion characteristics and velocity characteristics of peak adhesion coefficient for different types of tyres (summer, winter) in different weather conditions are presented. Differences in characteristics courses caused by tyre type and weather conditions are discussed. For instance, in case of winter tyres it was noticed that their peak value of adhesion coefficient was reached for higher values of slip ratio than it was observed for summer tyres.
Źródło:: Journal of KONES; 2012, 19, 3; 363-369
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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: 3.

Tytuł:: Problem of the selection of the rate of the grip of tyres to the roadway covered with petroleum-derived substances
Autorzy:: Aleksandrowicz, P.
Żółtowski, B.
Powiązania:: https://bibliotekanauki.pl/articles/2073664.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: rate of the adhesion
road safety
slide of the vehicle
Opis:: The area of the roadway covered with petroleum-derived substance is characterized by lowering the grip of tyres of the vehicle to the roadway. In realistic conditions of the road traffic that kind of obstacles are with difficulty noticeable for the driver and sedatenesses constitute the element of surprise which in combination with violent lowering the rate of the adhesion usually results in loss directional of vehicle. The vehicle which fell into the unchecked skid, in particular on the curve of the road is posing a threat to drivers driving up from the opposite direction on account of random migration of such a vehicle to their traffic lane. Driving vehicles on the roadway this way polluted also have limited possibilities of taking defensive action in order to avoid confronting. For the evaluation of the bearing of drivers in understanding violating by them safety rules in the road traffic on the roadway polluted with vehicles with substances mentioned above applying the rate of the adhesion which is appropriate in calculations and simulations is significant to the analysed road situation. In the article so a problem of the selection of this rate was taken relating to the case study of an existing road accident consisting in inducing collision of two vehicles moving along an asphalt wet roadway polluted with petroleum-derived substance - with diesel.
Źródło:: Journal of Polish CIMEEAC; 2015, 10, 1; 7--15
1231-3998
Pojawia się w:: Journal of Polish CIMEEAC
Dostawca treści:: Biblioteka Nauki

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