Abstract：Combining parallelly a negative stiffness disk spring with a linear positive stiffness spring, a novel quasi-zero stiffness vibration isolation system was designed. In the static characteristics analysis, the force-displacement relationship and the stiffness-displacement relationship were established, the system parameters which can offer zero stiffness at the equilibrium point were derived as well; In the dynamic characteristics analysis, the nonlinear dynamic equations were established separately when the system was excited by a harmonic force or a harmonic displacement. By using the averaging method, the effects of system parameters and excitation amplitude on the force transmissibility and the displacement transmissibility were studied. Compared with the equivalent linear system, the system was proved to be superior in the low frequency and ultra-low frequency vibration isolation. The results offered theoretical guidance for design and application of the novel quasi-zero stiffness vibration isolation system.
2014, Vol. 33 
