Abstract
<p>Automobile suspension systems have an important role in a vehicle's functioning, especially with regard to driving safety. In the present paper we exhibit the equations that characterize a passive suspension system. Considering that solving the equations is extremely cumbersome we developed a simulation scheme in MATLAB Simulink. The simulation allows for an analysis of the behavior of the passive suspension system on any uneven track surface whose configuration is ensured by stimulus signals. For the simulation we used the quarter car model. The suspension was chosen as having two degrees of freedom. </p>
Highlights
Automobile suspension systems are different from one to another depending on the manufacturer [1], a fact which gives the way for a great diversity between the models existing on the market
By analyzing the speed change when a step-type stimulus signal is applied in Figure 5 we observe that the velocity for unsprung mass is highly increased, given the fact that it is the first element of the suspension that takes over the shock
In order to get as close as possible to the real scenario in which a passive suspension system functions on an uneven track surface, we used stimulus signal 2 from Figure 3 which, as it can be observed, allows analysis for the hypothesis in which the wheel passes over a smooth ramp followed by a steep ramp and a straight road leading to a ramp, a hole and another straight road
Summary
Automobile suspension systems are different from one to another depending on the manufacturer [1], a fact which gives the way for a great diversity between the models existing on the market. In order to ensure traveling comfort, it is necessary to isolate the body of the automobile, called sprung mass, from the track irregularities [6]. It is recommended [6] to decrease the frequency of the sprung mass down to values close to 1 Hz (a value which is known as the sensitive frequency of the human body) and to limit the frequency peak to a maximum of 10 Hz. It is necessary to study how a passive suspension system behaves when the track is uneven
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