Design of magnetic-air hybrid quasi-zero stiffness vibration isolation system

Abstract

The traditional linear vibration isolation system has the effect of vibration isolation only on the condition that the excitation frequency is more than 2ωn. Quasi-zero stiffness vibration isolation system has the characteristic of “high static and low dynamic”, which can effectively solve this problem. When subjected to static load, the system has high stiffness to provide enough support force for itself. When the system is subjected to dynamic load, its stiffness is approximately zero, which enlarges the frequency bandwidth of vibration isolation to achieve the performance of low-frequency vibration isolation. At present, most vibration isolation systems based on quasi-zero stiffness theory have some problems, such as fixed mass of isolated object and narrow range of quasi-zero stiffness. Therefore, on the basis of electromagnetic technology and air spring technology, a magnetic-air hybrid quasi-zero stiffness vibration isolation system is designed in this paper. The air spring is used to adjust positive stiffness, which provides a stable and variable support force for the whole system. Electromagnetic spring designed by electromagnetic technology is adopted to adjust negative stiffness. Under the interaction of negative stiffness and positive stiffness, the dynamic stiffness of the whole system is close to zero. This paper then analyzes the static property of the quasi-zero stiffness vibration isolation system, and studies the parameter relationship between positive stiffness component and negative stiffness component. Finally, the effect of vibration isolation is verified by experiments.