Abstract: The goat’s hind limbs play an important role in dampening vibrations caused by ground impact during movement. Inspired by the unique structure of their hind limbs, a novel bionic limb vibration isolator has been developed to suppress low-frequency vibrations. It consists of the base, the carrying platform, four bionic legs and so on. The bionic legs are made up of rods of varying lengths and springs in different directions to imitate the various shapes of bones such as the femur and patella of the hind limbs of goats and developed muscles such as the biceps and quadriceps. The bionic device was found to have excellent nonlinear stiffness through statics analysis, and could be flexibly adjusted to the work range and load capacity. The bionic vibration isolator offers lower natural frequencies (2.3 Hz), better vibration isolation effect and a wider vibration isolation band than conventional linear vibration isolator. The bionic device can effectively suppress vibrations above 3.2 Hz and reduce the amplitude of random vibrations to more than 90%. In addition, compared to similar bionic vibration isolation devices, the bionic isolator achieves excellent load-bearing capacity in a smaller size, which facilitates its application in practical production.

Key words:  , Vibration isolation , · Nonlinear stifness , · Goat hind limb , · Bionic design