Application Research on the Negative Stiffness of Disk Spring used in Low Frequency Precision Vibration Isolation

Negative-stiffness-mechanism can be used to isolate the low frequency vibration of the system.In this paper,a new type of low frequency passive vertical vibration isolator system making use of the disk spring negative stiffness is introduced.Disk spring has non-linear properties,and the disk spring has the negative stiffness characteristic under the particular condition.When combine the disk spring in the negative stiffness region with the positive stiffness spring in parallel connection form,by choosing the rational parameter,the stiffness of the system tends to be zero nearby the balance point,and the frequency of the system can be ultra low,so the bandwidth of the vibration isolation can be broadened,finally the purpose of low frequency vibration isolation is realized.The computer simulation results proved that the parallel mechanism has good effect of low frequency vibration isolation.