Temat: tire relaxation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: An analysis of tire relaxation in conditions of the wheel side cornering agle oscilations
Autorzy:: Luty, W.
Powiązania:: https://bibliotekanauki.pl/articles/244566.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: pneumatic tire
tire relaxation
tire cornering stiffness
Opis:: Results of laboratory experimental research of a truck tire, in conditions of side cornering angle dynamic changes are presented in this work. As research objects, there were 2 truck tires. These tires had different construction and as an effect they had different properties, including cornering resistance and relaxation length. Tires tests have been performed using the dynamometric trailer, fixed on the drum facility. During testing, the wheel side cornering angle oscillatory changes have been forcing, with frequency of 2 and 4Hz, in wide scope of the wheel rolling velocity. Chosen measurement results of lateral reaction force have been presented in time domain. Values of the lateral force oscillations amplitude and lateral force time lag have been observed. Amplitude and phase dynamic characteristics of tires, using FFT transformation, have been determined. A decrease of the lateral force oscillations amplitude and an increase of the lateral force phase shift with increasing input signal frequency, as the wheel cornering angle oscillations, have been shown. Conclusions about influence of the wheel rolling speed on tire relaxation effects in dynamic conditions have been formulated. There have been revealed that different properties of different tires types, described in quasistatic conditions have an influence on their behaviour also in dynamic conditions. Lower tire cornering resistance can decrease an amplitude of lateral force oscillations whilst greater tire relaxation length can decrease an amplitude and also can increase phase shift of lateral force oscillations.
Źródło:: Journal of KONES; 2011, 18, 1; 325-332
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: An analysis of tire relaxation process during dynamic changes of cornering angle
Autorzy:: Luty, W.
Powiązania:: https://bibliotekanauki.pl/articles/244189.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: pneumatic tire
tire relaxation
tire cornering stiffness
Opis:: The work presents results of laboratory experimental research of a truck tire in dynamic motion conditions. Researches were performed using dynamometric trailer and dual drum facility for tire dynamics testing. The research object was a new structure truck, tubeless tire (275/70R22.5) with steel cord included also in carcass and bell. Tested tired wheel was rolling over steel drum surface with different speed. A wheel cornering angle was forces with different increase and similar decrease rate. The control system of hydraulic wheel turning mechanism was controlled by the voltage signals generated by software, through the D/A converter card. Values of cornering angle and also lateral reaction force transmitted by tested wheel were measured during tests performing. Changes of lateral reaction force values, transmitted by a tired wheel depending on forced wheel cornering angle were observed. Tire behaviour in the conditions of wheel cornering angle variations at different wheel rolling speed is presented. An influence of tire relaxation on values of transmitted lateral reaction force, during forcing of wheel cornering angle, is presented. As a result, there are presented differences in transient tire behaviour during forcing of wheel cornering angle with different increase rate and at different wheel rolling speed. A scope of wheel motion conditions are indicated, where tire relaxation can be important in case of modelling its interaction with the ground in the aspect of vehicle driving safety and comfort. Lateral reaction force value, transmitted by a wheel, the tire relaxation phenomenon becomes less significant when the rolling speed increases, the cornering angle value increases and when the rate of the wheel cornering angle variation rate decreases. It has been also shown that the relaxation phenomenon occurs both when cornering angle increases or decreases.
Źródło:: Journal of KONES; 2009, 16, 1; 307-316
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Influence of the tire relaxation on the simulation results of the vehicle lateral dynamics in aspect of the vehicle driving safety
Autorzy:: Luty, W.
Powiązania:: https://bibliotekanauki.pl/articles/244449.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: tire relaxation
vehicle safety
lateral dynamics
vehicle dynamics simulation
vehicle driving safety
Opis:: Selected experimental research results of truck tire in steady-state side cornering and transient cornering conditions are presented in this paper. Experimental research results of the tire have been used in simulation research of medium duty truck in nonlinear driving conditions. The paper presents the structure of the vehicle dynamics model and a description of applied tire-road interaction model. Simulation research of the vehicle lateral dynamics has been performed in two variants: without and with the model of tire relaxation. During research, the tire relaxation length has been also changed. The steering wheel angle changes were forced as continuous sinusoidal excitation signal with a constant amplitude and with continuously increasing frequency. There have been analysed basic physical quantities characterizing the vehicle lateral dynamics connected with the vehicle active safety, especially including body yaw velocity and lateral acceleration in the centre of the truck body mass. An analysis of research results have been performed in the time and frequency domain. Time courses of analysed physical quantities and their frequency spectrum, obtained for tire-road interaction model without and with the tire relaxation (with different values of relaxation length) have been compared. Based on the simulation research results there have been considered the influence of tire relaxation on the vehicle performance. There have been shown that the tire relaxation can significantly change courses of observed physical quantities connected with vehicle lateral dynamics connected with vehicle driving safety.
Źródło:: Journal of KONES; 2015, 22, 1; 185-192
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Wyznaczanie parametrów modelu nabiegania ogumienia na podstawie wyników badań eksperymentalnych
Determination of tire relaxation model parameters based on experimental research results
Autorzy:: Luty, W.
Powiązania:: https://bibliotekanauki.pl/articles/395429.pdf
Data publikacji:: 2012
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: właściwości ogumienia
znoszenie boczne ogumienia
nabieganie ogumienia
tire properties
tire side cornering
tire relaxation
Opis:: W pracy przedstawiono wyniki badań eksperymentalnych ogumienia samochodu ciężarowego w nieustalonych warunkach znoszenia bocznego koła. Pokazano sposób aproksymacji wyników badań poprzez dopasowanie modelu nabiegania do charakterystyki nabiegania koła ogumionego. Przedstawiono sposób ręcznego oraz zautomatyzowanego doboru długości drogi nabiegania, z uwzględnieniem zmiany wartości obciążenia normalnego koła oraz zadawanego kąta znoszenia. Przedstawiono uproszczoną metodę określenia parametrów nabiegania na podstawie znanej wartości sztywności bocznej opony. Metoda umożliwia wyznaczenie wartości długości drogi nabiegania i jej zastosowanie bezpośrednio w modelu współpracy koła ogumionego z podłożem, z uwzględnieniem nieustalonych stanów znoszenia bocznego.
Experimental research results of truck tire in conditions of not steady-state side cornering are presented in this paper. A way of tire relaxation model approximation to the tire relaxation characteristics, obtained from experimental research have are presented. A way of manual and automated selection of relaxation length value, taking into account changes in the normal load and the wheel cornering angle are presented. A simplified method to determine relaxation parameters basing on the known value of tire lateral stiffness is described. Presented method allows to determine the relaxation length and its direct application in the model of tire-road interaction, including the tire relaxation.
Źródło:: Postępy Nauki i Techniki; 2012, 14; 135-147
2080-4075
Pojawia się w:: Postępy Nauki i Techniki
Dostawca treści:: Biblioteka Nauki

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