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Three-dimensional vibration of a ring with a noncircular cross-section on an elastic foundation
(2018)
A theoretical model for the tread slip and the effective rolling radius of the tyres in free rolling
(2017)
RMOD-K Tyre model Family
(2013)
Rubber Bushing MBS Model
(1998)
Ride comfort simulations and steps towards life time calculations: RMOD-K tyre model and ADAMS
(1999)
Dieser Beitrag der Hochschule Anhalt (FH) und der gedas beschreibt ein Modellsystem mit dem Ziel, das Verhalten von Reifen auf unterschiedlichen Straßenbelägen zu berechnen. Neben der Modellierung des Reifens selbst liegt ein weiterer Schwerpunkt auf der Darstellung realer Straßenverhältnisse basierend auf Messungen unter Verwendung eines Millimetergitters. Simulationen im Bereich der Fahrdynamik, des Fahrkomforts bis hin zu Lebensdauertests mit virtuellen Fahrzeugmodellen können mit dem Modellsystem RMOD-K bereits in einem frühen Stadium der Fahrzeugentwicklung durchgeführt werden.
Summary In this paper, a simplified model of tangential contact between tyre and rigid surface is investigated. By linearization the eigensystem of the contact equations is obtained and parameter variations are carried out. It is shown, that some vehicle model parameters have great influence on the eigensystem of tangential contact and can determine the highest eigenfrequency of the system vehicle and tyre. Root loci are used to investigate the influence of parameters like vehicle velocity and gridwidth of the discretization. Based on the eigensystem, stability areas of numerical methods in solving the partial differential equations of tangential contact are calculated. Numerical solutions using stiff and nonstiff integrators are compared with respect to the stability areas, computational effort and accuracy. The results are discussed with a view to further development.
RMOD-K V 7.09
(2007)
Tyre models in vehicle dynamics: theory and application, part 2: tyre structure dynamics tyre model
(2008)
There are two aims for the second part of this paper: verifying the theory presented in the first part through parameter variation and comparison between simulation and experiment, and to study the effect of the belt structure on the cornering properties of radial tyres. Research has been carried out with a passenger car radial tyre and two different kinds of truck or bus radial tyres using both simulation and experiment. This second part of the paper shows that belt structure plays an important role in the generation of tyre forces and moments in addition to the effects of the tread stiffness and friction coefficients. The theory and method presented in this paper opens a new robust way to predict the tyre forces and moments from the tyre design and provides a reliable model for a generation mechanism.
Tyre rolling kinematics and prediction of tyre forces and moments: part I - theory and method
(2012)
A new method to describe tyre rolling kinematics and how to calculate tyre forces and moments is presented. The Lagrange–Euler method is used to calculate the velocity and contact deformation of a tyre structure under large deformation. The calculation of structure deformation is based on the Lagrange method, while the Euler method is used to analyse the deformation and forces in the contact area. The method to predict tyre forces and moments is built using kinematic theory and nonlinear finite element analysis. A detailed analysis of the tyre tangential contact velocity and the relationships between contact forces, contact areas, lateral forces, and yaw and camber angles has been performed for specific tyres. Research on the parametric sensitivity of tyre lateral forces and self-aligning torque on tread stiffness and friction coefficients is carried out in the second part of this paper.
Among load cases concerning vehicle suspension strength and durability, the misuse case is very special because of large obstacles. In this paper, an extension of the flexible belt model RMOD-K 7 concerning misuse situations is discussed. In normal rolling conditions, contact occurs between tire and road surface. To handle misuse deformations, the contact between the inner surface of the tire and the rim has to be dealt with. Results of the validation process are shown, leading to normal forces up to 70 [kN]. The model can be used together with mbs full vehicle models. One example is the determination of the critical test velocity, which generates the maximum of suspension stresses and can be found using RMOD-K 7.