通过折纸中流动诱导的快速翻转实现可调阻力下降
Tunable drag drop via flow-induced snap-through in origami
AI总结：
该研究利用双稳态折纸机构的快速翻转响应实现阻力随流速的不连续变化，通过调节折纸单元特性可调控阻力骤降的临界条件，结合理论模型指导逆向设计，为流体环境中被动阻力控制提供新方法。
摘要：
我们利用双稳态折纸机构的快速翻转响应，诱导阻力随流速发生不连续变化。平衡状态之间的转变由气流被动驱动，我们证明在流速小幅增加时，大的形状重构会导致阻力显著且突然下降。此外，我们表明系统地改变折纸单元的几何和力学特性，能够调节这种阻力不连续性以及其发生的临界速度和载荷。实验结果得到理论气动弹性模型的支持，该模型进一步指导逆向设计，以确定针对目标阻力骤降的结构折纸参数组合。这种方法为在流体环境中利用折纸启发机制实现高效被动阻力控制提供了思路，适用于载荷减轻或需要气动性能快速转变的情况。
英文摘要：
We leverage the snap-through response of a bistable origami mechanism to induce a discontinuous evolution of drag with flow speed. The transition between equilibrium states is passively actuated by airflow, and we demonstrate that large shape reconfiguration over a small increment of flow velocity leads to a pronounced and sudden drop in drag. Moreover, we show that systematically varying the geometrical and mechanical properties of the origami unit enables the tuning of this drag discontinuity and the critical speed and loading at which it occurs. Experimental results are supported by a theoretical aero-elastic model, which further guides inverse design to identify the combination of structural origami parameters for targeted drag collapse. This approach sheds light on harnessing origami-inspired mechanisms for efficient passive drag control in a fluid environment, applicable for load alleviation or situations requiring swift transitions in aerodynamic performances.
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