A study of a nonlinear vibration isolator with a quasi-zero stiffness characteristic

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Beneficial performance of a quasi-zero-stiffness vibration isolator with time-delayed active control (2014, methodology): “In [3–9], the QZS-VI system is demonstrated to be an ultra-low frequency vibration isolator by adjusting the stiffness characteristics and geometric size of the two horizontal springs.”
A tunable high-static–low-dynamic stiffness vibration isolator (2010, methodology): “For example, in [3,4], a QZS isolator was obtained by connecting a vertical coil spring and two oblique coil springs.”
On the analytical and experimental assessment of the performance of a quasi-zero-stiffness isolator (2014, background): “Kovacic et al. (2008) extended the study considering linear and nonlinear pre-stressed oblique springs.”
Vibration isolation via a scissor-like structured platform (2014, methodology): “To suppress vibration over a larger frequency range, an isolator so-called quasi-zero-stiffness vibration isolator (QZS-VI) is proposed and studied in the literature [2], [4–11].”