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Model-based Engineering - Fully Equipped City Bus Model - First Correlations Between Numerical and Experimental Data

Kowarska I., Kuczek K., Uhl T.

Mechanics and Mechanical Engineering

2011

Vol. 15, nr 4

79--89

In this paper fully equipped city bus model and its correlations with experimental data is presented.This task is developed at AGH University of Science and Technology in the EU{founded project EURECA{CHASING, in which functional virtual prototyping has been applied. The model consists of multi-body suspension made in Virtual.Lab (LMS software) built from rigid elements connected with each other with kinematics joints and exible superstructure (FEM made in HypeMesh-Altair software). Multibody models are used to simulate body dynamic behaviour. To make the realistic, all board systems such as ECAS or ABS have been modelled in AMESim (LMS software). Fully equipped city bus model has been developed for the purpose of calculating kinematics of the suspension what can be use to optimize ride and handling performance. However all models are useful if they are not corresponding to reality. For this reason experiments with real city bus have been carried out. The results of correlation numerical and experimental data have been presented and some interesting consideration have been derived.

Model-based engineering-simulation based design of the suspension of city bus

Kowarska I., Skarbek J., Kuczek K., Uhl T.

Journal of KONES

2011

Vol. 18, No. 4

205-212

Process of designing of vehicle suspension as a combination of springs and dampers is a very complicated task. In general it requires designing system respecting good ride comfort and good handling at the same time. It is obvious that these two aspects are dependent also of the type of the road on which vehicle is riding. Especially it is important in city buses which are workplaces for bus drivers and each day are transporting thousands of people. Bus suspension system is quite different from car suspension. Because of the mass and size instead of traditional springs, pneumatics springs are used. In some cases, values of damping and stiffness of the spring are adjusted to the proper road in a real bus while driving. It is necessary nowadays to have a virtual assessment that can simulate "bus suspension behaviour" to abstracted suspension parameters such as springs and dampers characteristics. In this paper a multibody model of city bus suspension has been presented. Multibody models are the best way of simulation of dynamic behaviour of the vehicle. Simulations showing how different types of the road affect the structure of the vehicle have been performed. Such prepared model can be then use as an input for optimization of the bus suspension in terms of ride comfort, handling, or even passengers' safety.