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This paper presents good results obtained by an integrated work between experimental and numerical simulation areas of DaimlerChrysler do Brasil to identify an undesirable vibration phenomenon observed in the cabin of a medium truck prototype, characterized experimentally. The phenomenon was reproduced in the modal and dynamic analyses using FEA, consistent with the performed measurements in the vehicle. Modifications on the project of cabin suspension were developed and approved in vibration analyses, showing a reduction of the acceleration values to acceptable levels when evaluated in the prototype. Due to these modifications, an evaluation under durability criteria was necessary. The stress analyses showed necessity of alteration in some components of the cabin suspension. The prototypes, with the new cabin suspension, were submitted to test bench and evaluation in high severity road (off-road) and urban traffic aiming at the final product approval.

This paper describes the application of structural and dynamic analysis of a new articulated bus developed by Daimler-Chrysler do Brasil. Structural analysis is carried out using both static and dynamic finite element analysis. The simulation of the vehicle running on a road track gives input for structural dynamic analysis that is followed by durability calculation. Dynamics analyses are carried out using the multibody dynamic methodology and the software Adams/View. Initially, a detailed numerical model is developed, including all the major non-linearities of the actual vehicle, such as air spring and shock absorber curves, suspension bump stops and tire model. Also the representation of the suspension geometry and articulation properties is introduced. Using this model, the first dynamic analysis performed is the calculation of forces acting on suspension elements when the bus is running on a road track with severe profile.