Abstract
The vehicle suspension has the primary task of mitigating the forcing coming from the road surface. The performance is directly linked to the rigidity of the suspension system. The traditional suspensions, which are composed of linear elements, are able to effectively attenuate the high frequencies even if lacking good performance with forcing at low frequencies. In this regard, non-linear suspensions have been designed, which are characterized by a non-linear force-displacement relationship.
These types of suspensions are able to obtain a non-linear characteristic thanks to the combination of positive stiffness elements with negative stiffness elements returning an equivalent system characterized by almost zero stiffness at the equilibrium.
The performance of the QZS suspension system is analysed using the MSC Adams multibody simulator. The static characteristic, the transmissibility characteristic and the performance at dynamic tests, based on road profiles according to ISO 8608 generated through Matlab, are analyzed.
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