Design and testing of a passively adaptive inlet
Design and testing of a passively adaptive inlet
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DOI：
10.1088/1361-665x/aacf79
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发表时间：
2018-08-01
影响因子：
4.1
通讯作者：
Pirrera, A.
中科院分区：
文献类型：
--
作者：
Arena, G.;Groh, R. M. J.;Pirrera, A.
机械失稳和弹性非线性是变形器设计的新兴工程手段。在本文中，我们利用玻璃纤维板后屈曲行为的分类来设计一种自适应进气口，该进气口被动地调节流入连接管道的流体。自适应组件根据周围流体的速度和压力，通过快门打开和关闭来控制入口光圈。传感、驱动和控制完全由后屈曲部件的特性决定。屈曲后的应力--通过适当施加压缩和弯曲载荷而在复合材料面板中产生--创造了面板快速通过和快速恢复所需的稳定性的内在特征。此外，相关的后屈曲形状创造了驱动所需的气动压力场。通过风洞实验对这一设计理念进行了探索和验证。所提出的被动驱动和控制机制对于要求简单和质量最小化的流体控制应用特别有价值。
Mechanical instabilities and elastic nonlinearities are emerging engineering means for designing shape-changing devices. In this paper, we exploit the taxonomy of post-buckling behaviours of a glass-fibre panel to design an adaptive air inlet that passively regulates the fluid flow into a connected duct. The adaptive component controls the inlet aperture by snapping open and closed depending on the velocity and pressure of the surrounding fluid. Sensing, actuation and control is entirely governed by the characteristics of the post-buckled component. Post-buckling stresses- induced in the composite panel by suitably applying compressive and bending loads-create the intrinsic characteristics of stability required for the panel to snap-through and snap-back. Furthermore, the associated post-buckled shape creates the aerodynamic pressure fields required for actuation. This design concept is explored and validated here by means of wind tunnel experiments. The passive actuation and control mechanism presented is particularly valuable for fluid control applications where simplicity and mass-minimisation are critical.