A novel high-static-low-dynamic stiffness isolator with enhanced negative stiffness magnetic spring using variable reluctance stress

Abstract

To isolate low frequency vibration, an enhanced negative stiffness magnetic spring using variable reluctance stress (ENS-MS-VRS) is proposed, which utilizes the designed double mover configuration and relocated nonworking air-gap. The ENS-MS-VRS is parallel connected with spiral flexure spring to construct a high-static-low-dynamic stiffness vibration isolator. The analytical model of the ENS-MS-VRS is initially established and subsequently validated by simulation analysis, then the negative stiffness enhancement mechanism of ENS-MS-VRS is theoretically elucidated by comparing it with the negative stiffness magnetic spring using variable reluctance stress (NS-MS-VRS). Furthermore, the results of experiment demonstrate that the isolator with ENS-MS-VRS exhibits a significantly wider isolation band than that with NS-MS-VRS.