• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 43
  • 17
  • 4
  • 3
  • 3
  • 1
  • Tagged with
  • 75
  • 75
  • 30
  • 15
  • 14
  • 10
  • 10
  • 9
  • 9
  • 9
  • 9
  • 8
  • 7
  • 7
  • 6
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Dancers and sculpture rethinking "planning" again /

Thung, Chi-ming, Herbert. January 2004 (has links)
Thesis (M. Arch.)--University of Hong Kong, 2004. / Includes special report study entitled: On mobile architecture, towards mobile urbanism. Also available in print.
12

Adaptable home a sustainable alternative to housing in Hong Kong and Pearl River Delta /

Yick, Sin-yan, Jamie. January 2004 (has links)
Thesis (M. Arch.)--University of Hong Kong, 2004. / Includes special report study entitled: Movable architecture: a study of movable environment in the past, present and future. Also available in print.
13

Dynamics characterization of highly flexible beams using a 3D motion analysis system

Ramanathan, Suresh, January 2004 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2004. / Typescript. Includes bibliographical references (leaves 75-78). Also available on the Internet.
14

LABVIEW SOFTWARE DEVELOPMENT FOR INPUT AND OUTPUT MEASUREMENT AND CONTROL OF FLEXLAB

Saunders, Carrie L. January 2006 (has links)
No description available.
15

Flexlab: A flexible structure controls test platform

Blinn, Bart A. January 1997 (has links)
No description available.
16

Vibration Control of Large Scale Flexible Structures Using Magnetorheological Dampers

Liu, Wei 10 March 2005 (has links)
Structural vibration control (SVC) of large scale structures using the magnetorheological (MR) dampers are studied. Some key issues, i.e. model reduction, suppression of spillover instability, optimal placement of actuators and sensors, modeling of the MR dampers and their applications in SVC system for large scale structures, are addressed in this work. A new model reduction method minimizing the error of a modal-truncation based reduced order model (ROM) is developed. The proposed method is implemented by using a Genetic Algorithm (GA), and can be efficiently used to find a ROM for a large scale structure. The obtained ROM has a finite H2 norm and therefore can be used for H2 controller design. The mechanism of the spillover instability is studied, and a methodology to suppress the spillover instability in a SVC system is proposed. The suggested method uses pointwise actuators and sensors to construct a controller lying in an orthogonal space spanned by the several selected residual modes, such that the spillover instability caused by these residual modes can be successfully suppressed. A GA based numerical scheme used to find the optimal locations for the sensors and actuators of a SVC system is developed. The spatial H2 norm is used as the optimization index. Because the spatial H2 norm is a comprehensive index in evaluating the dynamics of a distributed system, a SVC system using the sensors and actuators located on the obtained optimal locations is able to achieve a better performance defined on a distributed domain. An improved model of MR dampers is suggested such that the model can maintain the desired hysteresis behavior when noisy data are used. For the simulation purpose, a numerical iteration technique is developed to solve the nonlinear differential equations aroused from a passive control of a structure using the MR dampers. The proposed method can be used to simulate the response of a large scale structural system with the MR dampers. The methods developed in this work are finally verified using an industrial roof structure. A passive and semi-active SVC systems are designed to attenuate the wind-induced structural vibration inside a critical area on the roof. The performances of the both SVC systems are analyzed and compared. Simulation results show that the SVC systems using the MR dampers have great potentials in reducing the structural vibration of the roof structure.
17

Static H-infinity Control of a Cantilevered Beam Using an Analytical Upper Bound Approach

Sweeney, Robert John 27 April 2005 (has links)
This paper considers the control of externally symmetric vector second order systems using an analytical upper bound method. The structural model is a cantilevered aluminum beam with a collocated pair of piezoceramic patches to serve as actuators and sensors. A computationally efficient method for approximating the H-infinity norm for externally symmetric systems is presented. The approximation method is then used to calculate a scalar output feedback controller to guarantee a closed-loop norm less than any user defined value. This method is tested with a finite-element representation of the beam, and then verified experimentally.
18

Combined integral and robust control of the segmented mirror telescope

Looysen, Michael W. January 2009 (has links) (PDF)
Thesis (M.S. in Astronautical Engineering)--Naval Postgraduate School, December 2009. / Thesis Advisor(s): Agrawal, Brij; Kim, Jae Jun. "December 2009." Description based on title screen as viewed on January 27, 2010. Author(s) subject terms: MIMO control, Robust control, adaptive optics, segmented mirrors, flexible structures, space telescopes, Shack-Hartmann sensors, hybrid controller. Includes bibliographical references (p. 77). Also available in print.
19

Attitude control of flexible structures

Ward, Christina C. January 1990 (has links) (PDF)
Thesis (M.S. in Astronautical Engineering)--Naval Postgraduate School, September 1990. / Thesis Advisor(s): Agrawal, Brij N. Second Reader: Titus, Harold. "September 1990." Description based on title screen as viewed on December 17, 2009. DTIC Identifier(s): Attitude Control Systems, Flexible Structures, Spacecraft, Structural Response, Resonant Frequency, Experimental Design, Model Tests, Active Control, Gifts Computer Program, Dynamic Response, Computerized Simulation, Control Theory, Modal Analysis, Laboratory Tests, Theses. Author(s) subject terms: Attitude Control, Flexible Structures. Includes bibliographical references (p. 52). Also available in print.
20

Electrostatically actuated and bi-stable MEMS structures

Upadhye. Abhijit. January 2007 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2007. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 16, 2008) Includes bibliographical references.

Page generated in 0.9483 seconds