A novel adaptive aerostructure based on conventional, certified aerospace materials. This structure relies on a grid of conventional,hexagonal honeycomb cells that extend
over a significant length perpendicular to the plane of the cells. Inside each of the cells resides a pouch which can be inflated. By varying the cell
differential pressure, the overall stiffness
of the pressurized honeycomb can be varied.
By doing so, a fully embedded pneumatic actuator is
created.
Suggested Uses
If the honeycomb system is placed within aircraft structures, it can be used as a substitute for conventional low-bandwidth flight control actuators.
Advantages
Reduction of part count, complexity, power consumption, and cost of conventional high-lift devices
Detailed Description
Pressure-adaptive honeycomb has significant
benefits with respect to conventional (electromechanical) actuators. There are no sliding or hinging
parts which means there is no wear and tear
through operation. Manufacturing, assembly, and
integration into conventional wing structures are
all straightforward and can rely on conventional
techniques and certified materials. In terms of
compliance it has been estimated based on prior
experiments on conventional honeycombs that
strains in excess of 50% can be achieved in either
principal direction. It can be seen that pressure-adaptive
honeycomb displays relatively large strains compared
to other adaptive materials. Its volumetric
energy density rivals that of the electromechanical
servo. Additionally the mass specific energy density of this pressureadaptive
honeycomb is close to that of shape memory alloys,
which have the highest mass specific energy density
of all adaptive material classes.