Evaluation of MF-swift for durability simulations

S. Leenders, I.J.M. Besselink (Begeleider), S. Knorr (Begeleider)

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Daimler AG uses simulation tools to predict how the car will perform before testing takes place. The simulations are important because it reduces costs and time. One of the important topics is durability. A customer wants a car which is reliable. Therefore several test are carried out like for example driving over cleats or through potholes. These test have a major impact to the suspension and chassis components. During the design of the suspension it’s important to simulate these tests. To predict the outcome of the simulation accurately the forces generated by the tyre need to be known. Therefore it is crucial to have a correct simulation model of the tyre. Several tyre models exist in the market like MF-Swift and Ftire. Because there are multiple tyre models available, it is necessary for Daimler to know how these models perform and make a comparison. The objective of this report is the evaluation of MF-Swift for durability load simulations. Various road obstacles are used to evaluate the performance of MF-Swift. Some of these simulations are compared with measurement data and other simulations with a different tyre model, Ftire. The resulting tyre forces are analyzed in the time domain and using damage calculations. The first step is to generate a tyre property file. This file contains all the required parameters of the tyre model. Daimler has two measurement sets available of tests executed in Aachen and Karlsruhe. With these measurement sets the required parameters for MF-Swift can be identified. The in-plane dynamics are parameterized with the Aachen measurements and the out-of-plane dynamics with the Karlsruhe measurements. Combining two measurement sets is not an ideal situation. The reason for this was that the out-of-plane dynamics were not excited in the Aachen measurements. The first part of this report evaluates the low speed enveloping behaviour and some dynamic cleat experiments. Simulations show that MF-Swift has a better match with the measurements for the enveloping behaviour compared to Ftire. However, if only the peak-to-peak values are analyzed it is visible that the general trend for MF-Swift is a higher vertical force while Ftire has a lower vertical force when they are compared with the measurements. The longitudinal forces of both models matches rather well with the measurements. The cleat experiments used for the parametrization process are simulated with the two tyre models. Both models are able to match the vertical force reasonably well, but some differences exist for the longitudinal force. MF-Swift is able to describe the peak-to-peak value for the out-of-plane measurement rather well, for the in-plane case MF-Swift is only able to match the negative peak. Ftire isn’t able to match the peak-to-peak values for both in-plane and out-of-plane. The difference for the out-of-plane is probably caused by the fact that it was not possible to simulate Ftire on a drum. The second part contains simulations for rough road conditions. The obstacles which are used are a cleat, oblique cleat, pothole and belgian blocks. The simulations show that MF-Swift has a higher vertical force compared to Ftire for all the simulations except for the cleat oblique manoeuvre. The trend for the longitudinal force is that Ftire always has a higher force. The differences were also shown by the damage sums. Those damage sums are evaluated for different x-positions of the cleat. MF-Swift has a very consistent behaviour, while Ftire sometimes shows a certain position dependent behaviour which originates from the discretisation of the tyre.
Originele taal-2Engels
Plaats van productieEindhoven
UitgeverijEindhoven University of Technology
StatusGepubliceerd - 2011

Publicatie series

NaamD&C
Volume2011.003

Bibliografische nota

Traineeship report. - DC 2011.003

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