The resonance phenomenon often imposes limitations in structural design when loads have variable frequency.
Components exhibiting variable stiffness allow enlarging the range of frequencies that the structures can undergo
without the risk of resonance.
The layout of tunable-stiffness bushing system proposed in this paper consists of a typical rubber silent-block working in parallel to a circular array of Ni-Ti wires which, changing from their martensitic state to the austenitic one, induce significant variations in the load-displacement response of the entire supporting system.
The versatility of the configuration is due to the possibility to activate the wires in various combinations, extending the range of stiffness values obtainable with respect to the case of a single Ni-Ti component.
Both numerical simulations and experimental tests conducted on a prototype of the support indicated that interesting performances could be achieved with the proposed bushing structure.