Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Ralph C. Fenn"'
Publikováno v:
Smart Materials and Structures. 5:49-57
The utility of helicopter aviation is limited by the high vibration levels caused by the interaction of each rotor blade with the wake of preceding blades. Existing full-blade actuation using a swashplate has various problems such as insufficient ban
Publikováno v:
Proceedings of 1995 American Control Conference - ACC'95.
Recently, SatCon Technology Corporation has successfully demonstrated a novel anti-gravity suspension for NASA Langley. This approach consists of a passive gravity-unload mechanism enhanced with an active inertia-controller. The passive gravity-unloa
Publikováno v:
SPIE Proceedings.
We determined the wavelength dependence of the minimum spot size of a laser beam focused through human sclera to evaluate the potential for transcleral glaucoma surgical techniques using ultrashort-pulsed lasers. The spectrum of the forward scattered
Autor:
Paul L. Carson, Ralph C. Fenn, Marilyn A. Roubidoux, Aaron Moskalik, Yong Zhang, J. Brian Fowlkes
Publikováno v:
Acoustical Imaging ISBN: 9781461346401
Three dimensional (3D) ultrasound images provide superior visualization of anatomical features than two dimensional (2D) power mode or frequency shift color Doppler B-scan ultrasound images. However, 3D data sets require transducer position measureme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::16300a592d3f4f4ea55639e3fc72b4f4
https://doi.org/10.1007/978-1-4419-8588-0_38
https://doi.org/10.1007/978-1-4419-8588-0_38
Autor:
David M. Dozor, Ralph C. Fenn, Michael J. Gerver, John R. Berry, Shankar Jagannathan, D. M. Logan
Publikováno v:
SPIE Proceedings.
A high force to volume ratio magnetostrictive reaction mass actuator has been designed and developed. The actuator operates as a resonant device allowing the stored strain energy to be utilized. A discussion of the design issues associated with this
Autor:
Michael J. Gerver, John R. Berry, Ralph C. Fenn, Donald J. Merkley, Dariusz A. Bushko, Frank Phillips
Publikováno v:
SPIE Proceedings.
Integrated actuation system for individual control ofhelicopter rotor bladesDariusz Bushko, Ralph Fenn, Mike Gerver, John Berry, Frank PhilipsSatCon Technology CorporationCambridge, Massachusetts 02142Donald J. MerkleyU.S. Aiiny AATDFort Eustis, Virg
Autor:
Michael J. Gerver, Ralph C. Fenn
Publikováno v:
SPIE Proceedings.
Magnetostrictive Terfenol-D transducers are an attractive alternative to viscoelastic dampers, and electrodynamic and piezoelectric actuators for damping and self-sensing. These advantages include high stiffness and primary load carrying capability,
Autor:
Michael J. Gerver, Ralph C. Fenn
Publikováno v:
Adaptive Structures Forum.
Terfenol-D magnetostrictive material has been used for actuation but rarely for "reverse" transduction from mechanical to electrical energy. A Terfenol-D transducer produces intense magnetic fields when compressed which are converted into electrical
Publikováno v:
SPIE Proceedings.
The utility of helicopter aviation is limited by the high vibration levels caused by interaction of each rotor blade with the wake of preceding blades. Existing full blade actuation using a swashplate has various problems such as insufficient bandwid
Publikováno v:
SPIE Proceedings.
Magnetostrictive adaptive materials have many benefits over competing materials such as piezoelectric types. These advantages include very low power and voltage, high toughness and strength, and the ease of composite manufacture. The amorphous metal