Abstract
ABSTRACT - Commercial vehicles –transporting tons of freight – usually fitted with multiaxle groups to distribute their load among the axles. In order to address the problem of manoeuvrability with multiple axes self-steered or actively steered rear axle systems are used on these kinds of trucks. A vehicle with actively steered rear wheels has the advantages that the characteristic of the vehicle can be tuned regarding the different driving situation. This paper focuses on the dynamics of actively steered rear axle mechanisms together with the applied hydraulic actuator. The system is analyzed from the sensitivity stability and controllability point of view. Making these examinations delivers the results which will be the basis for further investigation and for the control design. For example a controller is simpler and more effective if the known properties of the system are incorporated in the design state. Where it is required the detailed dynamical model is simplified according to given aim. The calculated results conform to the engineering expectations.
KEYWORDS – rear axle steering, stability, hydraulic actuation, four-bar linkages, dynamics