Influence of Rubber Temperature on Transfer Functions of Bushings

Koch, Peter; Angrick, Christian; Beitelschmidt, Denise; Prokop, Günther; Knauer, Peter

doi:10.4271/2015-01-9115

Cited by 1 publication

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“…Next to the kinematic aspects or unsprung masses, the stiffness and damping properties, both primary and secondary, are of great importance for the transmission of road unevenness to the vehicle body. The fundamental dependencies of these parameters are widely known (Koch et al, 2015;Troulis, 2002), as are the interrelation of various suspension elements (Lohse, 2016;Stretz, 2011) and their effect on the vehicle behaviour (Bedük et al, 2018;Kaldas et al, 2012;Phalke and Mitra, 2017), which is typically treated as an optimization problem (Jayachandran and Krishnapillai, 2012;Kaldas et al, 2014). But in order to predict vehicle behaviour more accurately in the future, further research is necessary to assess the required level of detail (Bedük et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Friction of a MacPherson suspension system at various load cases

Deubel

Prokop

2022

Journal of Vibration and Control

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In the current vehicle development process, the suspension friction is commonly treated as a constant force, while other suspension parameters, such as stiffness and damping, are quantified according to the actual kinetic state. Even though this simplification might be approximately true for many suspension variants, the theoretical background and the experiments conducted in this study indicate that the suspension friction of a MacPherson system is strongly subject to change depending on the forces and moments acting at the tyre contact patch. On the other hand, there is only a limited research basis quantifying to what extent suspension friction is affecting vehicle behaviour during various driving events. Therefore, assessments of whether an often-urged friction reduction is appropriate in the context of developmental efforts and benefits are equally limited. The first reasonable step is to accurately determine the actual amount of suspension friction regarding various boundary conditions and load situations, which currently is not constituted in literature. Hence, within the frame of the present study, the friction under various influences is investigated for a compact car, beginning at the full suspension and with special focus on lateral forces and combined wheel deflection states. While certain influences (engine state, excitation amplitude in a limited range) seem to be of minor importance, the suspension friction is strongly affected by various forces and moments at the tyres and by the wheel deflection level, whereas the lateral force dependence is mostly distinctive.

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