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This paper describes the methodology adopted at T-Systems do Brasil, for performing handling analysis of commercial vehicles. Its application to an intercity bus with 3 axles is presented. The objective is to improve primary suspension characteristics alone, with respect to both comfort and handling and to study the behavior of the full vehicle with respect to handling and to improve it through the changes of primary suspensions characteristics. The methodology adopted was the development of a complete multibody model of the bus (Figure 4) in ADAMS, considering all the major non-linearities of the actual vehicle, such as air spring and shock absorber curves, suspension bump stops and tire model (Delft). Once having the model, several analyses were carried out including, modal, single lane change, double lane change, steering impulse and sine steering sweep.

It is presented a theoretical and experimental study about noise attenuation device in hydraulic power steering systems. Due to the noise reduction from other vehicle sources, as engine, hydraulic system noise contribution has become more relevant. The hydraulic power steering system major noise source is the pump, contributing with its own operating noise, and also by pressure pulsation in pipeline, which in turns excite another sources. The operating principle of attenuation system is the destructive superposition of pressure waves, and for the phenomenon occurrence, the waves must be 180° out of phase. Delay between the waves is obtained through system parameter settings, geometric and physic. So it was performed system modeling, focusing in the pipeline in order to characterize the system components, and also the model validation was done through comparison between model and test data obtained with commercial system.