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document
Vos, R. (author), Scheepstra, J. (author), Barrett, R. (author)
The paper begins with a brief historical overview of pressure adaptive materials and structures. By examining avian anatomy, it is seen that pressure-adaptive structures have been used successfully in the Natural world to hold structural positions for extended periods of time and yet allow for dynamic shape changes from one flight state to the...
conference paper 2011
document
Scheepstra, J. (author), Vos, R. (author), Barrett, R. (author)
A new method for designing a morphing Fowler flap based on pressure-adaptive honeycomb is detailed. Pressure adaptive honeycomb has been shown to be able to induce gross camber deformations in airfoil sections, such as a flap. However, due to the large amount of design variables the integration of the honeycomb as a distributed actuator in a...
conference paper 2011
document
Vos, R. (author), Barrett, R. (author)
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...
conference paper 2010
document
Vos, R. (author), Barrett, R. (author)
A new type of adaptive structure is presented that relies on a pressure derential to perform gross structural deformations. This structure relies on highly compliant honey-comb cells that can be pressurized externally or can rely on a pressure differential that exists at elevated altitudes. By pressurizing this honeycomb, its stiffness can be...
conference paper 2010
document
Vos, R. (author), Barrett, R. (author)
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...
conference paper 2010
document
Groen, M. (author), Van Schravendijk, M. (author), Barrett, R. (author), Vos, R. (author)
The dynamic response of a new class of flight control actuators that rely on post-buckled recompressed (PBP) piezoelectric elements is investigated. While past research has proven that PBP actuators are capable of generating deflections three times higher than conventional bimorph actuators, this paper quantifies the work output and power...
conference paper 2009
document
Barrett, R. (author), Vos, R. (author), De Breuker, R. (author)
This paper describes a new class of flight control actuators using Post-Buckled Precompressed (PBP) piezoelectric elements to provide much improved actuator performance. These PBP actuator elements are modeled using basic large deflection Euler-beam estimations accounting for laminated plate effects. The deflection estimations are then coupled...
conference paper 2007
document
Vos, R. (author), Barrett, R. (author), De Breuker, R. (author), Tiso, P. (author)
journal article 2007
document
Vos, R. (author), Barrett, R. (author), Krakers, L. (author), Van Tooren, M. (author)
This paper presents the use of a new class of flight control actuators employing Post-Buckled Precompressed (PBP) piezoelectric elements in morphing wing Uninhabited Aerial Vehicles (UAVs). The new actuator relieson axial compression to amplify deflections and control forces simultaneously. Two designs employing morphingwing panels based on PBP...
conference paper 2006
document
Barrett, R. (author), McMurtry, R. (author), Vos, R. (author), Tiso, P. (author), De Breuker, R. (author)
This paper describes a new class of flight control actuators using Post-Buckled Precompressed (PBP) piezoelectric elements. These actuators are designed to produce significantly higher deflection and force levels than conventional piezoelectric actuator elements. Classical laminate plate theory (CLPT) models are shown to work very well in...
conference paper 2005
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