Rolling radii and moment arm of the wheel load for pneumatic tyres

Kutzbach, Heinz Dieter; Bürger, Alexander; Böttinger, Stefan

doi:10.1016/j.jterra.2018.11.002

Cited by 27 publications

(15 citation statements)

References 7 publications

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“…The wheel load torque, acting on the wheel module, is derived from the power balance in the contact patch between the tire and its surface of motion according to the following formula from [13] T wload = F x r 0 where, F x is the is the wheel circumferential force also known as wheel longitudinal force and r 0 w is the tire rolling radius in the driven mode, i.e. when there is no driving torque applied to the wheel (more details on driven/driving/braking/free/neutral wheel power-loading modes can be found in [9,[23][24][25]], R x is the rolling resistance that is computed from the Bekker-Wong model [24,26], F f ramex is the vehicle frame force, D a is the air drag force, F a = M • dVx dt is the force needed to increase the kinetic energy of a wheel in translational motion, M is the module gross mass.…”

Section: Wheel Locomotion Module Dynamicsmentioning

confidence: 99%

Fuzzy controller, designed by reinforcement learning, for vehicle traction system application

Demkiv¹,

Lozynskyy²,

Vantsevich³

et al. 2021

Math. Model. Comput.

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In this article, a fuzzy controller tuned by reinforcement learning is proposed. The developed algorithm utilizes a fuzzy logic theory and a reinforcement learning for fine-tuning parameters of the membership function for the fuzzy controller. Apart from the fuzzy controller developed, a fuzzy corrector of reference input (set-point) signal to the controller is applied. The fuzzy corrector changes the input (reference) signal of the system and takes into account an original reference input and type of external disturbances. Thus, the designed fuzzy control that is tuned by reinforcement learning is capable to ensure the stable, optimal, and safe performance of the system and takes into account external disturbances. To verify the performance of the proposed controller, the adaptive fuzzy controller tuned by reinforcement learning is applied to the mathematical model of a wheel locomotion module of an electric vehicle to advance a traction control system. Therefore, the effectiveness of the proposed adaptive fuzzy controller is proven through the simulation results.

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Section: Wheel Locomotion Module Dynamicsmentioning

confidence: 99%

Fuzzy controller, designed by reinforcement learning, for vehicle traction system application

Demkiv¹,

Lozynskyy²,

Vantsevich³

et al. 2021

Math. Model. Comput.

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“…Due to large overall dimensions and high relative deformation of such tires, a significant decrease in the values of contact pressures at the tire-soil border is provided and the track depth decreases after the passage of the wheel, resulting in the reduction of power losses for rolling and rutting. However, in the works of various scientific teams [1,2] it was noted that with a decrease in the internal air pressure in the tire, there is a progressive increase in hysteresis losses, which in turn leads to an increase in power losses for wheel rolling. The problem of increasing the efficiency of agricultural vehicles equipped with ultra-lowpressure tires stands alongside the problem of increasing fuel efficiency.…”

Section: Introductionmentioning

confidence: 99%

Estimation of energy consumption for rolling a mobile vehicle equipped with ultra-low-pressure tires

et al. 2021

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The article deals with the problem of reducing energy consumption when moving mobile power sources on deformable support bases. On basis of experimental studies using test-bench equipment, the main output parameters of 1020x420-18 tire of Bel-79 model were determined. Analysis of the results obtained made it possible to determine an optimal range of intra-tire pressure, when the realized propulsive efficiency takes maximum values, and energy consumption for selfpropulsion is minimal.

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“…Research on rolling radius on various road surfaces has been the subject of discussions and scientific studies for many years [10,13,15,17,18,21,22,23]. Determining the exact value of rolling radius influences the considerable improvement in the exactness of skid value calculation and drive force and plays a key role in the determination of a vehicle's linear movement speed [19].…”

Section: Introductionmentioning

confidence: 99%

Method of indicating effective circumferences of rolling vehicle wheels

Janulin¹

2020

Diagnostyka

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Determining the exact values of the rolling radii of the wheels is extremely important in terms of the functioning of the safety systems of modern vehicles. It is on the basis of the rotational speed of the vehicle wheels that the traction parameters of the vehicle are determined, as well as the warning about the existence of low tire pressure. The precision of determining the turning radius significantly improves the accuracy of calculations of the slip value, driving force, and also plays a key role in determining the linear speed of a motor vehicle. This article presents the method of determining the value of the rolling radius of a tire and tests of changes in its value under the influence of changes in the value of vertical load and tire pressure. Based on the performed measurements, a mathematical model of changes in the value of the effective wheel rolling circumference from the above-mentioned parameters was determined. The results of the regression analysis indicate a very good fit of the developed model to the results of the conducted experimental research. Keywords: turning radius of the wheel, wheel load, tire pressure. METODA WYZNACZANIA EFEKTYWNYCH OBWODÓW TOCZENIA KÓŁ POJAZDÓW Streszczenie Określenie dokładnych wartości promieni toczenia kół jest niezwykle istotne w aspekcie funkcjonowania systemów bezpieczeństwa nowoczesnych pojazdów. To na podstawie prędkości obrotowych kół pojazdu określane są parametry trakcyjne pojazdu, jak również generowane jest ostrzeżenie o byt niskim ciśnieniu w ogumieniu. Precyzja określania promienia toczenia wpływa na znaczną poprawę dokładności obliczeń wartości poślizgu, siły napędowej, jak również odgrywa kluczową rolę w przypadku określania liniowej prędkości ruchu pojazdu samochodowego. W niniejszym artykule przedstawiono metodę wyznaczania wartości promienia toczenia koła ogumionego oraz przeprowadzono badania zmian jego wartości pod wpływem zmian wartości obciążenia pionowego oraz ciśnienia w ogumieniu. Na podstawie przeprowadzonych pomiarów, wyznaczono model matematyczny zmian wartości efektywnego obwodu toczenia koła od wymienionych parametrów. Wyniki analizy regresji wskazują na bardzo dobre dopasowanie opracowanego modelu do wyników przeprowadzonych badań eksperymentalnych. Słowa kluczowe: promień toczenia koła, obciążenie koła, ciśnienie w ogumieniu.

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Rolling radii and moment arm of the wheel load for pneumatic tyres

Cited by 27 publications

References 7 publications

Fuzzy controller, designed by reinforcement learning, for vehicle traction system application

Fuzzy controller, designed by reinforcement learning, for vehicle traction system application

Estimation of energy consumption for rolling a mobile vehicle equipped with ultra-low-pressure tires

Method of indicating effective circumferences of rolling vehicle wheels

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