MACS are used to provide semi-active control in vibration absorbers and positioning.


Tunable Vibration Absorbers

Tunable vibration absorbers use the variability in stiffness of one component of a system, a secondary mass-spring-damper, in order to affect the dynamics of the primary system by tuning the secondary system to absorb the resonance of the first. Traditional MREs (made from soft-magnetic filler particles) have shown an ability to shift shear modulus under magnetic fields and hence have been widely used in this regard. The MACS lab seeks to design ever smaller TVAs and vibration absorbing devices that operate in shear and other deformation modes such as bending.


 

Shear Actuation for Positioning

Magneto-active elastomer materials (MAEs, made from hard-magnetic filler particles) provide both shear stiffening and shear-positioning (i.e. true actuation) capabilities and hence are amenable to a wider range of control algorithms. Current work has already shown the ability of MAE materials to provide dynamic shearing actuation, while future work seeks to employ these materials in closed-loop control systems.