Correction to: An improved quasi-zero stiffness vibration isolation system utilizing dry friction damping

1 Correction to: Nonlinear Dyn https://doi.org/10.1007/s11071-020-05685-5

Equation 7 should appear as follows:

$$ F_{f} = \left\{ {\begin{array}{*{20}c} {k\left[ {x\left( t \right) - w\left( t \right)} \right] \cdot \left( {x\left( t \right) - w\left( t \right)} \right)} & \vert{k\left[ {x\left( t \right) - w\left( t \right)} \right] \cdot \left( {x\left( t \right) - w\left( t \right)} \right)\vert \le \mu N} \\ {\mu N\text{sign} \left( {\dot{w}\left( t \right)} \right)} & \vert{k\left[ {x\left( t \right) - w\left( t \right)} \right] \cdot \left( {x\left( t \right) - w\left( t \right)} \right)\vert > \mu N} \\ \end{array} } \right\}, $$

(7)

The original article has been corrected.