Technical Note: Rolling dynamic stiffness and damping characteristics of small-sized pneumatic tyres

Saran, V. H.; Goel, V. K.

doi:10.1243/0954407001527394

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…The second factor is the automobile velocity ( V ) and excitation frequency ( ω ) which is the frequency of the impact on the tire. Based on the research by Saran and Goel 33 and Kim et al, 34 automobile velocity and excitation frequency significantly affect the tire damping coefficient. In Figure 4, we are able to see the changes in the tire damping coefficient due to changes in velocity and excitation frequency.…”

Section: Problem Formulationmentioning

confidence: 99%

Investigation of tire stiffness and damping coefficients effects on automobile suspension system

Rostami

Najafabadi

Ganji

2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this paper, we analyzed the vibration of an automobile suspension system. The influence of tire pressure and arc angle, vehicle velocity, and road impact frequency on the tire stiffness and damping coefficient was considered in this analysis. Moreover, an experimental formula for tire damping coefficient based on automobile velocity and impact frequency was proposed. In addition, the effects of the automobile’s mass, mass moment of inertia, unsprung mass, and center of gravity on the amplitude and period of vibration were investigated. The body was considered rigid, and the tires and other unsprung-loaded accessories were particles of a four-degree-of-freedom system. The equations of motions were solved by the analytical Laplace transform method and validated using Runge-Kutta numerical method. Based on outcomes for an initial displace of the front axle, increasing the tire pressure from 0.2 to 0.8 MPa leads to a 40% increase and 70% decrease in front and rear axles, and declining tire arc angle from 50° to 30° increases the maximum displacement of the front axle by 13% and halves the period. Different excitation frequency values (5, 10, 50, and 100 Hz) were applied to the system, which produced a 31%, 8%, and 9% rise in amplitudes. We understood that the tire damping coefficient decreases on a logarithmic scale for an automobile with a speed between 1 and 25 m/s. Furthermore, alternation in mass does not affect body rotation, and the alternation of mass moment of inertia does not influence body displacement significantly.

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Section: Problem Formulationmentioning

confidence: 99%

Investigation of tire stiffness and damping coefficients effects on automobile suspension system

Rostami

Najafabadi

Ganji

2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Saran and Goel [19] have investigated the lateral rolling stiffness and damping characteristics of small pneumatic tyres. Their technical note presented experimentally measured results and they showed the tyre stiffness, temperature, and pressure increase due to cleat excitation.…”

Section: Introductionmentioning

confidence: 99%

Some torsional stiffness and damping characteristics of a small pneumatic tyre and the implications for powertrain dynamics

Guzzomi

Sharman

Stone

2009

Proceedings of the Institution of Mechanical Engineers, Part D:

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Torsional vibration modelling of powertrains is hindered by the lack of understanding of tyre low-frequency torsional stiffness and damping characteristics. Torsional here means rotation about the wheel (spin) axis so that the rotation of the wheel hub is different from that of the periphery of the tyre. This paper explains a simple, practical test rig design that can be used to determine a tyre's torsional characteristics via simple modelling. The model assumes a complex stiffness that allows the damping type to be determined as a function of the frequency. The measurement of some torsional stiffness and damping characteristics of a small pneumatic tyre while under load and rolling is presented. The tyre was excited torsionally and, from the results obtained, the tyre's torsional stiffness and damping characteristics were calculated. The investigations were concerned with the low-frequency characteristics. It was found that there was a large torsional vibration associated with the tread pattern. Over the frequency range tested (10-50 Hz), it was found that the damping is more accurately represented as hysteretic and not viscous when lightly loaded. The effects of rotational speed, preload, and inflation pressure on the stiffness and damping were also investigated. The damping type for the tyre (hysteretic or viscous) was found to vary depending on the loading and excitation. Tyre properties were then included in a lumped-inertia, frequency-domain powertrain model and the steady-state response predicted. The results indicated that the viscous or hysteretic damping assumption has significant effects on the predicted frequency response of the powertrain. The need for further studies investigating the damping characteristics of automotive tyres in torsion is therefore recommended.

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A Novel Technique to Measure the Rolling Resistance of Tyres Using Force Transducer

Gupta¹,

Saran

Sharma

2015

J. Inst. Eng. India Ser. C

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Technical Note: Rolling dynamic stiffness and damping characteristics of small-sized pneumatic tyres

Cited by 5 publications

References 4 publications

Investigation of tire stiffness and damping coefficients effects on automobile suspension system

Investigation of tire stiffness and damping coefficients effects on automobile suspension system

Some torsional stiffness and damping characteristics of a small pneumatic tyre and the implications for powertrain dynamics

A Novel Technique to Measure the Rolling Resistance of Tyres Using Force Transducer

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