Traditional linear vibration isolation system fails to achieve a lower initial vibration isolation frequency after setting the dimensional parameters.To address this issue,this article presented an electromagnetic vibration isolation system with variable stiffness based on the structure of a permanent magnet nested in an electromagnetic coil.To be specific,the system was characterized by high static stiffness and low dynamic stiffness.The mathematical model of the magnetic force of the system was created using the molecular current method.In addition,the strongly nonlinear dynamic model of the single-degree-of-freedom passive vibration isolation system was established by fully considering the quadratic and cubic nonlinear stiffness terms in the mechanical model of the vibration isolation system.The article used the incremental harmonic balance(IHB)method to solve the dynamic model and analyze the influence of excitation,current,and other factors on the displacement transmissibility of the system.An experimental test system was then created to validate the effectiveness of the proposed vibration isolation system.The experimental results and theoretical calculation demonstrate that the initial vibration isolation frequency of the system is reduced by 19.25％after introducing the current.This expands the frequency range of vibration isolation and improves system adaptability to different vibration sources.
关键词
高静-低动刚度/隔振/位移传递率/电流
Key words
high static stiffness and low dynamic stiffness/vibration isolation/displacement transmissibility/current
维普
万方数据