Pressure adaptive honeycomb: a new adaptive structure for aerospace applications
Pressure adaptive honeycomb: a new adaptive structure for aerospace applications
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DOI：
10.1117/12.847031
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发表时间：
2010-03
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影响因子：
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通讯作者：
R. Vos;R. Barrett
中科院分区：
文献类型：
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作者：
R. Vos;R. Barrett
提出了一种新型的自适应结构，其依赖于相对于六边形平面延伸显著长度的加压蜂窝单元。通过改变每个单元内的压力，可以改变刚度。可变刚度与外部施加的力场相结合导致完全嵌入的压力自适应致动器，其可以产生远远超出自适应材料中的最新技术水平的应变。作为压力的函数的刚度变化是通过分配一个等效的材料刚度蜂窝壁，占固有的材料刚度作为压力引起的刚度建模。梁结构，依赖于这个模型的有限元分析示出相关性以及三点弯曲试验的实验结果。为了验证嵌入式压力自适应蜂窝的概念，构造了一个带有自适应襟翼的风洞试验件，并在低速风洞中进行了试验。已经证明，通过改变单元压力，襟翼改变其几何形状，随后改变升力系数。
A new type of adaptive structure is presented that relies on pressurized honeycomb cells that extent a significant length with respect to the plane of the hexagons. By varying the pressure inside each of the cells, the stiffness can be altered. A variable stiffness in combination with an externally applied force field results in a fully embedded pressure adaptive actuator that can yield strains well beyond the state-of-the-art in adaptive materials. The stiffness change as a function of the pressure is modeled by assigning an equivalent material stiffness to the honeycomb walls that accounts for both the inherent material stiffness as the pressure-induced stiffness. A finite element analysis of a beam structure that relies on this model is shown to correlate well to experimental results of a three-point bend test. To demonstrate the concept of embedded pressure adaptive honeycomb, an wind tunnel test article with adaptive flap has been constructed and tested in a low speed wind tunnel. It has been proven that by varying the cell pressure the flap changed its geometry and subsequently altered the lift coefficient.