Optimized Bio-inspired Micro-pillar Dry Adhesive and Its Application for an Unmanned Aerial Vehicle Adhering on and Deta
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Journal of Bionic Engineering https://www.springer.com/journal/42235
Optimized Bio-inspired Micro-pillar Dry Adhesive and Its Application for an Unmanned Aerial Vehicle Adhering on and Detaching from a Ceiling Qingsong He1*, Xianrui Xu1, Zhiwei Yu1, Kai Huo1, Zhaoyang Wang2, Nuo Chen2, Xuean Sun2, Gui Yin2, Peile Du3, Yang Li1, Zhendong Dai1* 1. Institute of Bio-inspired Structure and Surface Engineering, Jiangsu Provincial Key Laboratory of Bionic Functional Materials, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China 2. College of Astronautics, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China 3. China Ship Development and Design Center Shanghai Branch, Shanghai 201108, China
Abstract Various bio-inspired dry adhesive materials have been investigated. In this work, lithography and silicon deep etching method were used to fabricate bio-inspired micro-pillar dry adhesive materials of which the parameters, such as side length, Height to Side length Aspect Ratio (HSAR), and inter-pillar Distance to Side length Aspect Ratio (DSAR) were comprehensively studied to obtain a dry adhesive with high adhesion. An orthogonal array method was designed and a series of fabrication experiments were conducted to identify optimum parameters, which resulted in a high normal adhesion of 2.98 Ncm‒2 and a shear adhesion of 9.59 Ncm‒2. An adhesion and desorption device was further designed on basis of the optimum dry adhesive, which enables an Unmanned Aerial Vehicle (UAV) to successfully adhere on and detach from a ceiling. This would allow an UAV to stay aloft for prolonged time, which could be invaluable to many applications, such as energy conservation and aerial detection. Keywords: bio-inspired dry adhesive, orthogonal array method, UAV, adhere, ceiling Copyright © Jilin University 2020.
1 Introduction Geckos’ ability to climb and run on horizontal or vertical surfaces, smooth or rough, is attributed to the micro/nano-scale, high aspect ratio beta-keratin consisting of mesoscale lamellae, micro-scale setae, and nano-scale spatulae hairs on their toe-pads[1–3]. Many studies have fabricated bio-inspired micro-fibrillar structures using various materials and structures[4–21]. For example, vertically-aligned carbon nanotubes[4–8], polymers with micro-pillars[9–13], mushroom-shaped microstructures[14–19] and various hierarchical structures[20,21] have been studied. The adhesion generated by the bio-inspired micro-fibrillar structures significantly depends on the shape and size of the structure[22]. Campo et al. studied the role of the contact shape of pillars with various adhesion radii[23]. Gorb et al., Sitti et al. and Shao et al. fabricated mushroom-shaped dry adhesives to enhance adhesion[24–29]. Hu et al. designed various tip diameters and studied their effect on the adhesion *Corresponding author: Qingsong He, Zhendong Dai E-mail: [email protected], [email protected]
performance[29]. Greiner et al. investigated the effects of th
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