Abstract
The increasingly growing demand for more comfortable cars nowadays imposes a new way for dynamic analysis of the guiding axle linkages, with elaboration of models that are closer to the real mechanisms on the car. The complexity of the guiding mechanisms of the passenger cars makes it very difficult to handle the error in the case of simultaneous achievement of the entire model, therefore in the preliminary stages partial models are experimented (for the wheel suspensions, rear axle suspension). In paper, a dynamic model for the rear axle suspension is presented, considering the guiding mechanism as well as the elastic and damping elements. In the lack of the front suspension, modeling a fictive joint (spherical or planar joint) between car body and ground ensures the car body equilibrium. These models are comparatively analyzed in relation to the entire vehicle model. At the same time, the influence of the joint flexibility on dynamic behavior of the car body is analyzed. Using the MBS software DYMES makes the study. The dynamic simulation was achieved for a time interval long enough to catch all relevant motions during the experiment. The application is a typical example of Virtual Prototyping of the passenger car suspension. The advantages of this kind of simulation consist mainly in the possibility of make easy virtual measurements in any point and/or area of the system and for any parameter. For the concrete case of the undertaken in paper numerous measurements have been made regarding the dynamic behavior of the car.