Design and Characteristics Analysis of a Nonlinear Isolator Using a Curved-Mount-Spring-Roller Mechanism as Negative Stiffness Element

Figure 9

Absolute displacement and acceleration transmissibility of the isolator and the equivalent linear system with different excitation amplitudes for the displacement excitation. “Red line”: absolute displacement transmissibility. “Black line”: absolute acceleration transmissibility. “Blue line”: absolute displacement transmissibility of the ideal isolator. “Magenta line”: the equivalent linear system. “Green and red dotted line”: unstable solutions. “o”: peak amplitude of transmissibility.

(a) For the overload system

(b) For the underload system