Characteristic Analysis of Bio-inspired Vibration Isolation System with Inerter

Compared with the quasi-zero stiffness vibration isolation system, the bio-inspired vibration isolation system has better static characteristics.The mechanical model of bio-inspired vibration isolation system with inerter is constructed, and the quasi-zero stiffness condition is determined.The amplitude-frequency response equation, the backbone curve equation and the force transmissibility expression for the system under harmonic excitation force are derived by average method.The stability boundary of the system is solved, and the influence of the system parameters on the dynamic characteristics of the system is analyzed.The results show that the addition of inerter can broaden the vibration isolation band and improve the low-frequency vibration isolation performance.The stiffness weakening effect of the system will be caused by an increasing habitus ratio.When the installation angle is large, the amplitude-frequency curve of the system changes from soft characteristic to hard characteristic with the increase of amplitude.Due to the coexistence characteristics of soft and hard, the system will have more complex jump phenomena.The increase of excitation amplitude will broaden the resonance region, increase the snap-through region, and narrow the effective vibrational isolation band.Appropriately increasing the linear damping ratio can improve the vibration isolation performance of the system.