Negative-stiffness isolators

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  • Natural frequency range: 0.17 – 2.5 Hz
  • Vertical Motion Isolation:

It uses a conventional spring connected to a Negative Stiffness Isolator (NSI) consisting of two bars hinged at the center. The stiffness of the isolator is K=KS-KN where KS is the spring stiffness and KN is the magnitude of a negative-stiffness which is a function of the length of the bars and the load P.

NSIV.png
  • Horizontal Motion Isolation:

The beam-columns have horizontal stiffness Ks with the weight load applied laterally. Due to this the lateral bending stiffness is reduced by the "beam-column" effect. This behavior is equivalent to a horizontal spring combined with an NSI so that the horizontal stiffness is K=Ks-Kn, and Kn is the magnitude of the beam-column effect.

NSIH.png

If you are done reading this page, you can go back to Types of PVI Systems

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