On the design of a high-static-low-dynamic stiffness isolator using linear mechanical springs and magnets

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On the analytical and experimental assessment of the performance of a quasi-zero-stiffness isolator (2014, background): “Carrella et al. (2008) also proposed an HSLDS isolator that consists of two linear coil springs and three permanent magnets arranged in an attracting configuration.”
Theoretical design parameters for a quasi-zero stiffness magnetic spring for vibration isolation (2009, neutral): “of a quasi–zero stiffness system using (positive stiffness) linear springs in parallel with negative stiffness magnetic springs [17].”
A tunable high-static–low-dynamic stiffness vibration isolator (2010, background): “Second, in contrast to the apparatus proposed in [9], the passive negative stiffness spring is obtained through interaction between the permanent magnet and the steel cores of the electromagnets.”