Analysis and Discussion of Configuration and Isolating Performance of Negative Stiffness Vibration Isolator

It is vital to lower the natural frequency(NF) of the passive vibration isolator (PVI) under low-frequency excitation. In this case, a negative stiffness mechanism (NSM) is an effective method. The paper firstly presents the method of the constructed NSM. Then we give different types of NSM, which aim at the lowest even zero stiffness. Furthermore, the characteristic of the NSM is analyzed. The negative stiffness configuration cancels the part of or the entire positive one. Compared with the experimental and theoretical data, the NSM obtains an excellent vibration isolation performance (VIP). The best NSMs perfectly not only possess high static with low dynamic stiffness properties but only has no contact and mechanical friction. The magnetic suspended structure is an optimal choice.