Energy conversion in woodpecker on successive peckings and its role on anti-shock protection of brain
- 734 Downloads
To investigate the mechanism of brain protection of woodpecker, we built a finite element model of a whole woodpecker using computed topography scanning technique and geometry modeling. Dynamic analyses reveal: (i) 99.7% of the impact energy is converted into strain energy in the bulk of body and 0.3% is converted into strain energy in the head after three successive peckings, indicating the majority of the impact energy is stored in the bulk of body; (ii) the strain energy in brain is mainly converted into the dissipated energy, alleviating the mechanical injury to brain; (iii) the deformation and the effective energy dissipation of the beaks facilitate the decrease of the stress and impact energy transferred to the brain; (iv) the skull and dura mater not only provide the physical protection for the brain, but also diminish the strain energy in the brain by energy dissipation; (v) the binding of skull with the hyoid bone enhances the anti-shock ability of head. The whole body of the woodpecker gets involved in the energy conversion and forms an efficient anti-shock protection system for brain.
Keywordswoodpecker anti-shock energy conversion brain protection
Unable to display preview. Download preview PDF.
- 2.Ono K, Kikuchi A, Nakamura M, et al. Human head tolerance to sagittal impact. Reliable estimation deduced from experimental head injury using subhuman primates and human cadaver skulls. In: Stapp Car Crash Conference (24th) Proceedings. Warrendale: SAE, 1980, 101–161Google Scholar
- 6.Zhou P, Kong X Q, Wu C W, et al. The novel mechanical property of tongue of a woodpecker. J Bionic Eng, 2009, 6: 214–218Google Scholar
- 22.Colly C. The jackhammer in your backyard. Reas Revel, 2009, 29: 33–36Google Scholar
- 29.Cooper T E, Trezek G J. Correlation of thermal properties of some human tissue with water content. Aerosp Med, 1971, 42: 24–27Google Scholar