A tunable high-static–low-dynamic stiffness vibration isolator

A New Approach to Achieve Variable Negative Stiffness by Using an Electromagnetic Asymmetric Tooth Structure

“…Only two ways have been found so far to realize variable negative stiffness: utilization of electromagnets [18][19][20] and application of actuator [21]. Zhou and Liu [18] and Francisco LedezmaRamirez et al [19,20] have presented a series of papers in which the negative stiffness is obtained by using two electromagnets and one (or two) permanent magnet. It works like the mechanism proposed by [13], but the negative stiffness can be changed by adjusting the input current.…”

“…The magnitude of the negative stiffness is adjusted by the current; thus no auxiliary regulating mechanism is needed. It is not the intention here to address the advantage of the designed isolator compared with those impressing isolators proposed by [18][19][20][21] or how low frequency the designed isolator can work in. Rather the intention is to show a new way to achieve variable negative stiffness and validate it by simulation calculations and experimental tests.…”

Characterization of an Electromagnetic Vibration Isolator

“…The tunable HSLDS isolator proposed in [11,12] belongs to the family of variable stiffness devices. The notable feature of the device is that its stiffness can be instantly decreased or increased without any moving parts.…”

“…As both the springs are nonlinear, determination of their stiffness models presents a challenge. In [11,12] an experimental approach was taken for this purpose. Another effective method to deal with such a system that involves two physics is to use a finite element (FE) based multiphysics software.…”

“…In Section 5, the study conclusions are presented. Figure 1 shows a schematic of the tunable HSLDS isolator proposed in [11,12]. A steel beam (2) is used to support a permanent magnet (PM) (3).…”