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高负载能力折纸可变形轮。

High-load capacity origami transformable wheel.

作者信息

Lee Dae-Young, Kim Jae-Kyeong, Sohn Chang-Young, Heo Jeong-Mu, Cho Kyu-Jin

机构信息

Biorobotics Lab, Soft Robotics Research Center, School of Mechanical Engineering/IAMD, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea.

School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.

出版信息

Sci Robot. 2021 Apr 7;6(53). doi: 10.1126/scirobotics.abe0201.

Abstract

Composite membrane origami has been an efficient and effective method for constructing transformable mechanisms while considerably simplifying their design, fabrication, and assembly; however, its limited load-bearing capability has restricted its application potential. With respect to wheel design, membrane origami offers unique benefits compared with its conventional counterparts, such as simple fabrication, high weight-to-payload ratio, and large shape variation, enabling softness and flexibility in a kinematic mechanism that neutralizes joint distortion and absorbs shocks from the ground. Here, we report a transformable wheel based on membrane origami capable of bearing more than a 10-kilonewton load. To achieve a high payload, we adopt a thick membrane as an essential element and introduce a wireframe design rule for thick membrane accommodation. An increase in the thickness can cause a geometric conflict for the facet and the membrane, but the excessive strain energy accumulation is unique to the thickness increase of the membrane. Thus, the design rules for accommodating membrane thickness aim to address both geometric and physical characteristics, and these rules are applied to basic origami patterns to obtain the desired wheel shapes and transformation. The capability of the resulting wheel applied to a passenger vehicle and validated through a field test. Our study shows that membrane origami can be used for high-payload applications.

摘要

复合膜折纸法一直是构建可变形机构的一种高效方法,同时极大地简化了其设计、制造和组装;然而,其有限的承载能力限制了其应用潜力。在车轮设计方面,膜折纸法与其传统对应方法相比具有独特优势,如制造简单、重量与载荷比高以及形状变化大,能够使运动机构具备柔软性和灵活性,从而抵消关节变形并吸收来自地面的冲击。在此,我们报告一种基于膜折纸法的可变形车轮,其能够承受超过10千牛的载荷。为实现高载荷,我们采用厚膜作为关键要素,并引入用于容纳厚膜的线框设计规则。厚度增加会导致面与膜之间出现几何冲突,但膜厚度增加所特有的是应变能过度积累。因此,用于容纳膜厚度的设计规则旨在兼顾几何和物理特性,并且这些规则应用于基本折纸图案以获得所需的车轮形状和变形。所得车轮的性能应用于乘用车并通过现场测试进行了验证。我们的研究表明,膜折纸法可用于高载荷应用。

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