Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 957 for “"actuation"”.
-
Optical Actuation of MEMS Devices
The experiments on radiation pressure revealed some unexpected behavior of the beam when toggled by short duration laser pulses. While long duration laser pulses at a power level slightly above the toggle threshold reliably toggled the beam every time, short duration pulses of the same power …
-
Binary actuation of solar mirrors
This thesis explores the use of binary actuators to adjust the shape of an array of mirrors. To explore this concept, an experimental system was refurbished and recalibrated. This experimental system was used to explore the range of possible configurations that could be reached by a simple binary …
-
Actuation and control for robotic physiotherapy
Over the last few years researchers have developed prototype robots that are capable of administering physiotherapy, however, these devices tend to be complex and expensive. The use of modem pneumatic servo systems as actuators would make such devices simpler and cheaper. This thesis assesses the …
-
Piezoelectric fiber composites for structural actuation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
-
Active fiber composites for structural actuation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
-
Induced strain actuation of composite plates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
-
Degradation of NiTi springs through electronic actuation
… in springs, the long-term reliability of these actuation forces has rarely been investigated. As SMAs are non-ferrous, it can be deduced that some structural degradation occurs %in the NiTi alloy springs due to fatigue. Due to SMA NiTi's high electrical resistance, actuation is most convenient …
-
Nanoporous Gold: Mechanics of Fabrication and Actuation
… at the double layer interface. A NPG based actuation device is designed to demonstrate its mechanical response with regard to surface charging. The performance of NPG proves to be sufficient for use in MEMS actuators.
-
Micro Electrostatic Actuation of a Silicon Diaphragm
… Such devices were fabricated and electrostatic actuation of the diaphragms was performed to analyze its viability as a micro-speaker. The long-term performance of such products requires adequate diaphragm deflection to create audible pressure waves with relatively low maximum stresses to ensure …
-
Active Micro-/Nano-Structures for Electromechanical Actuation
… system functionality. In particular, cooperative actuation of active structures assembled in parallel results in emerging concepts of electromechanical devices and systems with tunable characteristics enabled by exploiting all the degrees of design freedom available to the active components. …
-
Thermoplastic active fiber composites for structural actuation
… Monolithic piezoelectric materials for planar actuation have several drawbacks including: (a) use of the lower 3-1 actuation for planar actuation, (b) low strain before failure, (c) inability to conform to curved surfaces. Active Fiber Composites (AFCs) have been developed to address some of …
-
Blade mounted actuation for helicopter rotor control
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
-
Shape memory ceramic actuation of adaptive structures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
-
Shape Memory Alloys for small scale actuation
… of the current state of the art for small scale actuation with SMA wires, and to evaluate the Cu-based alternative SMA, which has a reduced cost and improved thermal properties. This thesis evaluates Cu-based SMAs as substitutes for NiTi in terms of activation strain of wire during a shape memory …
-
Investigation of deployable structures and their actuation
… alterations and snap fit strengthening. The actuation and mechanical loading of the structures and the input to output force ratio were investigated. This understanding was applied to several actuation methods.
-
Hydraulic amplification for actuation in microelectromechanical systems
… being to create high power density microscale actuation and power generation systems. This document provides an overview of the design considerations required for a successful microfabricated hydraulic amplifier, and proceeds to discuss the techniques developed to successfully fabricate, …
-
Force and strain feedback for distributed actuation
A method of shaping the open loop structural transfer function from a distributed sensor to a distributed actuator is developed. The outputs of two sensors of different impedances are combined electronically with the goal of increasing pole-zero spacing for improved performance in low-authority …
-
Dynamic programming applied to electromagnetic satellite actuation
Electromagnetic formation flight (EMFF) is an enabling technology for a number of space mission architectures. While much work has been done for EMFF control for large separation distances, little work has been done for close-proximity EMFF control, where the system dynamics are quite complex. …
-
Design and Test of an Automotive Clutch Actuation
This thesis builds on the analysis of a automatic system for automotive automatic clutches. In this field of study there are some constraint to take into account and through them it is possible to find the best technological solution. The system under consideration is characterized as …
-
Pneumatic Soft Robotic System for Actuation and Sensing
L'abstract è presente nell'allegato / the abstract is in the attachment
Page 1 of 48