Nonlinear property and dynamic stability analysis of a novel bio-inspired vibration isolation-absorption structure

Inspired by Ostrich anti-vibration and shock and vibration absorption properties, a novel bio-inspired vibration isolation-absorption (BIVIA) system is presented to design wideband vibration isolation bandwidth, low-frequency/ultra-low-frequency vibration isolation and high stability using toe-leg-spine coupling structure. Considering the kinematic relationship between skeletons and muscle/tendon, the geometrical relationships and dynamical equations of the BIVIA system are deduced for theoretical analysis and model verification. The influences of different parameters on loading capacity, dynamic stability, quasi-zero stiffness (QZS) zone, vibration isolation-absorption performance and vibration transmissibility are discussed. It discovers that high loading capacity and extended QZS zone are achieved by coupled vibration isolation-absorption structures. Moreover, the desirable and adjustable vibration isolation-absorption performance of the BIVIA structure can be obtained by designing key parameters. The BIVIA structure presents a practical method for bio-inspired vibration isolation and could be used in engineering and manufacturing.