32 research outputs found
Evolutionary algorithms for practical sensor fault tolerant control
The Shaky Hand is a multi-input, multi-output laboratory demonstrator which is modelled
on a village fete game. In the original, the aim is to guide, by hand, a wire loop along a wire
which has been bent to form a meandering track, 'without touching the loop to the wire. In
the original game, touching the hand-held loop against the wire track sets off a loud warning
bell and the player loses.
The thesis presents the research work associated with the quest for practical solutions to a
generic problem: the correct operation of a fallible system. The work covers three distinct
areas: modelling of the demonstrator, design and construction of a physical system, and
evoiution of algorithms for control of the demonstrator in practice in the presence of sensor
faults, using Cartesian Genetic Programming (CGP). The third area forms the core of the
thesis. The key challenges in creating the virtual environment to train for generic sensor fault
tolerant algorithms are considered and addressed. The evolved algorithms are analysed and
then verified using the demonstrator in practice. The practical results showed that sensor
fault tolerant control was successfully achieved
Design report of the KISS-II facility for exploring the origin of uranium
One of the critical longstanding issues in nuclear physics is the origin of
the heavy elements such as platinum and uranium. The r-process hypothesis is
generally supported as the process through which heavy elements are formed via
explosive rapid neutron capture. Many of the nuclei involved in heavy-element
synthesis are unidentified, short-lived, neutron-rich nuclei, and experimental
data on their masses, half-lives, excited states, decay modes, and reaction
rates with neutron etc., are incredibly scarce. The ultimate goal is to
understand the origin of uranium. The nuclei along the pathway to uranium in
the r-process are in "Terra Incognita". In principle, as many of these nuclides
have more neutrons than 238U, this region is inaccessible via the in-flight
fragmentation reactions and in-flight fission reactions used at the present
major facilities worldwide. Therefore, the multi-nucleon transfer (MNT)
reaction, which has been studied at the KEK Isotope Separation System (KISS),
is attracting attention. However, in contrast to in-flight fission and
fragmentation, the nuclei produced by the MNT reaction have characteristic
kinematics with broad angular distribution and relatively low energies which
makes them non-amenable to in-flight separation techniques. KISS-II would be
the first facility to effectively connect production, separation, and analysis
of nuclides along the r-process path leading to uranium. This will be
accomplished by the use of a large solenoid to collect MNT products while
rejecting the intense primary beam, a large helium gas catcher to thermalize
the MNT products, and an MRTOF mass spectrograph to perform mass analysis and
isobaric purification of subsequent spectroscopic studies. The facility will
finally allow us to explore the neutron-rich nuclides in this Terra Incognita.Comment: Editors: Yutaka Watanabe and Yoshikazu Hirayam
Evolutionary Algorithms for Practical Sensor Fault Tolerant Control
The Shaky Hand is a multi-input, multi-output laboratory demonstrator which is modelled on a village fete game. In the original, the aim is to guide, by hand, a wire loop along a wire which has been bent to form a meandering track, 'without touching the loop to the wire. In the original game, touching the hand-held loop against the wire track sets off a loud warning bell and the player loses. The thesis presents the research work associated with the quest for practical solutions to a generic problem: the correct operation of a fallible system. The work covers three distinct areas: modelling of the demonstrator, design and construction of a physical system, and evoiution of algorithms for control of the demonstrator in practice in the presence of sensor faults, using Cartesian Genetic Programming (CGP). The third area forms the core of the thesis. The key challenges in creating the virtual environment to train for generic sensor fault tolerant algorithms are considered and addressed. The evolved algorithms are analysed and then verified using the demonstrator in practice. The practical results showed that sensor fault tolerant control was successfully achieved.EThOS - Electronic Theses Online ServiceGBUnited Kingdo