Zobrazeno 1 - 10
of 188
pro vyhledávání: '"Darren J. Hartl"'
Autor:
Wesley A. Chapkin, Patrick Walgren, Geoffrey J. Frank, David Ryan Seifert, Darren J. Hartl, Jeffery W. Baur
Publikováno v:
Materials & Design, Vol 187, Iss , Pp - (2020)
In contrast to morphing wings, which have been intensively studied and demonstrated, relatively little research has focused on morphing fuselages, which are capable of improving agility and range by using the articulating section as an aerodynamic co
Externí odkaz:
https://doaj.org/article/12c3fbe1f9f74a8ba6a8f850d76d8739
Autor:
Wesley A. Chapkin, Patrick Walgren, Geoffrey J. Frank, David Ryan Seifert, Maria R. Ward Rashidi, Darren J. Hartl, Jeffery W. Baur
Publikováno v:
Materials & Design, Vol 186, Iss , Pp - (2020)
Shape-changing aerospace structures explore the trade-offs between aerodynamic performance and actuation efficiency. Herein, a morphing cylinder is optimized to minimize both its work to actuate in bending as well as radial deviations. Based on deriv
Externí odkaz:
https://doaj.org/article/81e836f2646548b0947d671a6e7bc5ef
Autor:
Amrita Bal, Jeffery W. Baur, Darren J. Hartl, Geoffrey J. Frank, Thao Gibson, Hong Pan, Gregory H. Huff
Publikováno v:
Sensors, Vol 21, Iss 5, p 1764 (2021)
This work presents the design and fabrication of two multi-element structurally embedded vascular antennas (SEVAs). These are achieved through advances in additively manufactured sacrificial materials and demonstrate the ability to embed vascular mic
Externí odkaz:
https://doaj.org/article/ab26991cea624e1c9bb91e9856bc5bad
Autor:
Hannah Stroud, Darren J Hartl
Publikováno v:
Smart Materials and Structures.
The properties of shape memory alloy (SMA) wires have long been leveraged across a variety of industries. While the response of such SMA forms implemented as straight axial actuators is well understood, curved and complex configurations such as knits
Autor:
Faith Gantz, Hannah Stroud, John C. Fuller, Kelsa Adams, Peter E. Caltagirone, Hande Ozcan, Ibrahim Karaman, Darren J. Hartl, Aaron P. Stebner, William Trehern, Travis Turner, Robert W. Wheeler, Marcus L. Young, Othmane Benafan
Publikováno v:
Shape Memory and Superelasticity. 8:150-167
Autor:
Pedro B. C. Leal, Hao Shen, Douglas F. Hunsaker, Jacob A. Schrass, Timothy Logan, Darren J. Hartl, Ted N. Giblette
Publikováno v:
AIAA Journal. 59:5020-5028
U.S. national research priorities include reducing the disruption caused by sonic booms, which hindered the economic viability of supersonic aircraft in decades past. However, shock waves are unavo...
Autor:
Travis L. Turner, Gaetano Arena, William Scholten, Alberto Pirrera, Darren J. Hartl, Rainer Groh
Publikováno v:
Arena, G, Groh, R, Pirrera, A, Turner, T, Scholten, W & Hartl, D 2021, ' Design of Shape-Adaptive Deployable Slat-Cove Filler for Airframe Noise Reduction ', Journal of Aircraft, vol. 58, no. 5, pp. 1034-1050 . https://doi.org/10.2514/1.C036070
Mechanical instabilities and elastic nonlinearities are emerging means for designing deployable and shape adaptive structures. Dynamic snap-through buckling is investigated here as a means to tailor the deployment and retraction of a slat-cove filler
Publikováno v:
AIAA AVIATION 2022 Forum.
Publikováno v:
SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies.
Shape memory alloys are capable of producing some of the highest actuation stresses (~300 MPa) of any active material. However, large monolithic SMA actuators, which can induce the tremendous forces required in some applications, are currently limite
Publikováno v:
Behavior and Mechanics of Multifunctional Materials XVI.