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Active control of sound transmissionJohnson, Martin Eric January 1996 (has links)
No description available.
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Passive and Semi-Active Vibration Control of Piezoelectric LaminatesBehrens, Sam January 2000 (has links)
Masters Research - Master of Engineering (Research) / This thesis considers a number of related problems in the area of passive and semi-active vibration control of piezoelectric laminates. The thesis consists of three main parts. The first part of the thesis develops a mathematical model of a physical resonant system-piezoelectric laminated simply supported beam. It is essential to have a good understanding of the physical system so that the associated problems with passive and semi-active shunt damping can be addressed. The second part of the thesis is concerned with problems related with current passive shunt damping techniques using a single piezoelectric laminate. One of the current problems with multiple mode techniques is determining the correct resistive damping for each resonant mode. Therefore, a systematic method is presented for determining the optimal resistance elements by minimizing the H2 norm of the damped system. After the design process, shunt circuits are normally implemented using discrete resistors, capacitors and virtual inductors (Riordan Gyrators). The difficulty in constructing the shunt circuits and achieving reasonable performance has been an ongoing problem. A new approach to implementing piezoelectric shunt circuits is presented. A “synthetic impedance”, consisting of a voltage controlled current source and digital signal processor (DSP) system, is used to synthesize the terminal impedance of a required shunt network. The third part of the thesis is concerned with the semi-active vibration control of piezoelectric laminated. This part addresses a number of associated problems with the current passive shunt damping schemes. The foremost being the complexity of the shunt circuits required to dampen multiple modes. They generally act to minimize structural vibration at a specific frequency – which are rarely stationary. Therefore, a new broadband semi-active shunt technique for controlling multiple modes has been developed. The “negative capacitor” controller is proposed theoretically, and then validated experimentally. The negative capacitor is simular in nature to a passive shunt damper as it uses a single piezoelectric transducer to dampen multiple modes of a flexible structure.
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General purpose, data driven, extensible, computer interface for smart sensorsRiddle, Brian K. 12 1900 (has links)
No description available.
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Development of a non-monochromatic lightwave sensor for applications in smart structures research /Kahn, Mohammed Tariq Ekeramodien. January 1900 (has links)
Thesis (MTech (Electrical Engineering))--Peninsula Technikon, 1998. / Word processed copy. Summary in English. Includes bibliographical references (leaves 97-104). Also available online.
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Miniaturised dedicated application opto-electronic sensors in the evolution of smart systems /Kahn, Mohammed Tariq Ekeramodien. January 1900 (has links)
Thesis (DTech (Electrical Engineering))--Peninsula Technikon, 2002. / Word processed copy. Summary in English. Includes bibliographical references (leaves 189-199). Also available online.
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Static shape control of laminated composite plate smart structure using piezoelectric actuatorsChee, Clinton Yat Kuan. January 2000 (has links)
Thesis (Ph. D.)--University of Sydney, 2000. / Title from title screen (viewed 27 February 2007). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Department of Aeronautical Engineering. Includes bibliographical references. Also issued in print.
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Modelling and experimental validation of the acoustic electric feedthrough techniqueMoss, Scott. January 2008 (has links) (PDF)
Mode of access: Internet via World Wide Web. Available http://hdl.handle.net/1947/9738. / "November 2008" Includes bibliographical references.
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Electrical resistivity as a measure of change of state in substrates design, development and validation of a microprocessor-based system /Le, Dong D. Vaidyanathan, Vijay Varadarajan, January 2009 (has links)
Thesis (M.S.)--University of North Texas, Dec., 2009. / Title from title page display. Includes bibliographical references.
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Development of a non-monochromatic lightwave sensor for applications in smart structures researchKahn, Mohammed Tariq Ekeramodien January 1998 (has links)
Thesis (MTech (Electrical Engineering))--Peninsula Technikon, Cape Town, 1998 / The purpose of this study was to perform an investigation into advances in the field of
opto-electronics and to develop a suitable lightwave sensor, for application in smart
structures research. Included in the scope of this research was the theoretical
development and analysis of an appropriate technology to lead to an implementation
of such sensors. This project forms part of an overall plan to gain experience in optoelectronic
(photonic) sensor design.
In research done previously in smart structure monitoring, piezo-electric techniques
with the usual electrical interconnections was used. In a highly distributed sensor
system the problems of electromagnetic interference, the tribo-electric effect and
noise could be problematic. In this research, opto electronic techniques were
thoroughly researched and an improvement on laser based fibre-optic interferometers
was made. A non monochromatic lightwave interferometer was developed from
theory and a prototype tested. The results suggests that an interferometric sensor can
be operated with a non monochromatic source by using a second interferometer to
modulate the frequency spectrum of the light before it is detected by a photodetector.
Various test and measurement circuits for improved photodetector performance were
evaluated, as well as a study of signal processing techniques that would be of use for
an upgrade of the project where specific feature detection and analysis using the
sensor is envisaged. A specification for a computer based data acquisition system
was developed to do initial tests. The project should continue, with the sensor head
being improved and all the necessary signal processing routines programmed into a
Labview based data acquisition system.
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Miniaturised dedicated application opto-electronic sensors in the evolution of smart systemsKahn, Mohammed Tariq Ekeramodien January 2002 (has links)
Thesis (DTech (Electrical Engineering))--Peninsula Technikon, Cape Town, 2002 / In the last decade, the South Amcan Electricity Supply Commission would have had
their ability to serve an ever demanding public severely tested. With the dilemma of
providing electricity supply through hazardous environmental conditions, and with
prospects of supplying power even beyond South Afiican borders, the need for a
comprehensive damage and power delivery assessment strategy becomes all the more
relevant. The rapid growth being made in the evolution of so called "intelligent"
structures, with inherent sensor, actuator and control mechanisms built in can have
direct influence on a power distribution network. At least in the foreseeable future, the
impact ofphotonic sensors with inherent miniaturization, a foremost candidate in Smart
System technology, can play a vital role in damage assessment of a potentially large
network such as that found in the supply ofelectricity.
Smart systems are nonliving systems that integrate the functions of sensing, actuation,
logic and control, to respond adaptively to changes in their condition or environment to
which they are exposed, in a useful and usually repetitive manner. Sensors are a
fundamental part of the evolution of such systems and form the basis for the topic of
this dissertation. The use ofoptical fiber sensors is increasing widely mainly due to their
(a) miniature size, (b) remote signal processing ability, and (c) multiplexing capabilities.
Because of the above features a variety of optical fiber sensing techniques has evolved
over the years having potential for a myriad of applications. In this work a systems model and equations was developed for modeling the
propagation of light in a optical waveguide, in order to study a Fabry Perrot sensor
topology for application as a miniaturised sensor in a new type of smart structure,
namely a smart electrical power system.
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